j1701177 001 r rev1 - epa wa
TRANSCRIPT
WA MARINE PTY LTD | ABN 84 168 014 819 | www.o2marine.com.au
Onslow Marine Support Base Stage 2: Dredging & Spoil Disposal Management Plan
CLIENT:
OMSB Pty Ltd
STATUS:
Rev F
REPORT NUMBER:
1702034
ISSUE DATE:
10th November 2017
DRAFT
OMSB Stage 2: DSDMP Page ii OMSB Pty Ltd 17WAU-0008 /R1702034
Important Note
This report and all its components (including images, audio, video, text) is copyright. Apart from fair dealing for the purposes of private study, research, criticism or review as permitted under the Copyright Act 1968, no part may be reproduced, copied, transmitted in any form or by any means (electronic, mechanical or graphic) without the prior written permission of O2 Marine.
This report has been prepared for the sole use of the OMSB Pty Ltd (herein, ‘the client’), for a specific site (herein ‘the site’, the specific purpose specified in Section 1 of this report (herein ‘the purpose’). This report is strictly limited for use by the client, to the purpose and site and may not be used for any other purposes.
Third parties, excluding regulatory agencies assessing an application in relation to the purpose, may not rely on this report. O2 Marine waives all liability to any third party loss, damage, liability or claim arising out of or incidental to a third party publishing, using or relying on the facts, content, opinions or subject matter contained in this report.
O2 Marine waives all responsibility for loss or damage where the accuracy and effectiveness of information provided by the Client or other third parties was inaccurate or not up to date and was relied upon, wholly or in part in reporting.
OMSB Stage 2: DSDMP Page iii OMSB Pty Ltd 17WAU-0008 /R1702034
WA Marine Pty Ltd t/as O2 Marine ACN 168 014 819 Originating Office – Dunsborough Suite 5 5/18 Griffin Drive, Dunsborough WA 6281 PO Box 1370 Dunsborough WA 6281 T 1300 739 449| F 61 7 3339 7222 | [email protected]
Version Register
Version Status Author Reviewer Change from
Previous Version
Authorised for Release
Signature Date
Rev A Draft J. Abbott C. Lane N/A
Rev B Draft J. Abbott
W. Bowyer
R. Hanley N/A
Rev C Draft J. Abbott
W. Bowyer
R. Hanley N/A
Rev D Draft W. Bowyer
C. Lane
R. Hanley Update to dredging methodology
Rev E Draft W. Bowyer
C. Lane
R. Hanley Update Geotechnical information
Include water quality monitoring program
On File 3/11/2017
Rev F Draft W. Bowyer
C. Lane
R. Hanley Minor amendments to Section 8.
On File 10/11/2017
DOCUMENT IS TO REMAIN IN DRAFT UNTIL MINISTERIAL STATEMENT HAS BEEN ISSUED
Transmission Register
Controlled copies of this document are issued to the persons/companies listed below. Any copy of this report held by persons not listed in this register is deemed uncontrolled. Updated versions of this report if issued will be released to all parties listed below via the email address listed.
Name Email Address
Andrew Natta [email protected]
OMSB Stage 2: DSDMP Page 4 OMSB Pty Ltd 17WAU-0008 /R1702034
Table of Contents
1. Introduction 7
1.1. Background 7 1.2. Proposal Summary 7 1.3. Proponent 7 1.4. Purpose 8
2. Description of Works 9
2.1. Proposal Description 9 2.2. Proposal Key Characteristics 9 2.3. Scope of Construction Work 12 2.4. Mobilisation and Site Installation 13 2.5. Site Facility 13 2.6. Pipeline Installation (Floating) 14 2.7. Pipeline Installation (Land) 14 2.8. Installation of Cutter Suction Dredge 15 2.9. Pre and Post Dredge Hydrographic Survey(s) 15 2.10. Dredging 15 2.11. Onshore Dredge Spoil Disposal 19
3. Stakeholder Consultation 29
3.1. Stakeholder consultation 29 3.2. Dredging Technical Advisory and Consultative Committee 29
4. Roles and Responsibilities 31
5. Environmental Factors and Objectives 32
6. Management 36
6.1. Benthic Communities and Habitats 36 6.2. Coastal Processes 39 6.3. Marine Environmental Quality 40 6.4. Marine Fauna 40 6.5. Flora and Vegetation 46 6.6. Terrestrial Environmental Quality 48 6.7. Terrestrial Fauna 49 6.8. Hydrological Processes 51 6.9. Air Quality 52 6.10. Social Surrounds 53
7. Waste Management 54
8. Monitoring 55
8.1. Marine Water Quality Monitoring Program 55 8.2. Discharge Water Quality Monitoring Program 62
9. Reporting 68
9.1. Daily Inspections/Checklists 68
10. Review 70
11. References 71
OMSB Stage 2: DSDMP Page 5 OMSB Pty Ltd 17WAU-0008 /R1702034
Figures
Figure 1 OMSB Stage 2 project area, including proposed capital dredging area and spoil disposal location 11 Figure 2 Floating Pipeline route for dredging Turning Basin 14 Figure 3 Schematic overview of a Cutter Suction Dredge 16 Figure 4 Details of a "Rosebud" cutter head 16 Figure 5 Graphical presentation of the work methodology of a CSD 17 Figure 6 Graphical presentation of the Box Cut Method 17 Figure 7 Damen Cutter Suction Dredger CSD 450 specifications (DAMEN 2017) 19 Figure 8 Particle Size Distribution OMSB Stage 1 21 Figure 9 DMMA layout 24 Figure 10 Dredge Spoil Disposal Stage 1 25 Figure 11 Dredge Spoil Disposal Stage 2 26 Figure 12 Dredge Spoil Disposal Stage 3 27 Figure 13 Location of the Priority 3 Species, Stackhousia clementii, located adjacent to the pipeline route corridor
47 Figure 14 Marine Water Quality Monitoring Program - Tiered Management Framework 57 Figure 15 Indicative MWQMP Monitoring Locations - Winter 59 Figure 16 Indicative MWQMP Monitoring Locations - Transitional 60 Figure 17 Indicative MWQMP Monitoring Locations - Summer 61 Figure 18 Discharge Water Quality Monitoring Program - Tiered Management Framework 64 Figure 19 Indicative DWQMP Monitoring Locations 66
Tables
Table 1 Proponent details 7 Table 2 Location and proposed extent of physical proposal elements 9 Table 3 Preliminary project construction schedule. 13 Table 4 Proposed Plant and Equipment 13 Table 5 Geotechnical test results for engineering geological units (CH2MHILL 2014) 22 Table 6 Descriptive statistics of sediment PSD from the berth pocket/turning circle, inner channel and outer
channel 22 Table 7 Roles and Responsibilities of Key Personnel 31 Table 8 Potential environmental impacts and associated project specific Environmental Protection Outcomes and
Management Targets. 32 Table 9 Management actions to minimise impacts on Benthic Communities and Habitats. 36 Table 10 Management actions to minimise impacts on Coastal Processes. 39 Table 11 Management actions to minimise impacts on Marine Environmental Quality. 40 Table 12 Management actions to minimise impacts on Marine Fauna. 43 Table 13 Management actions to minimise impacts on Flora and Vegetation 46 Table 14 Management actions to minimise impacts on Terrestrial Environmental Quality. 48 Table 15 Management actions to minimise impacts on Terrestrial Fauna. 49 Table 16 Management actions to minimise impacts on Hydrological Processes. 51 Table 17 Management actions to minimise impacts on Air Quality. 52 Table 18 Management actions to minimise impacts on Social Surrounds. 53 Table 19 Waste management objectives and measures. 54 Table 20 Environmental Protection Outcomes, Management Targets and Trigger Levels for protection of BCH from
dredging related impacts 56 Table 21 Indicative MWQMP Monitoring Locations 58 Table 22 Environmental Protection Outcomes, Management Targets and Trigger Levels for protection of marine
environmental quality and intertidal BCH from potential tail water discharge impacts 63 Table 23 Indicative DWQMP Monitoring Locations 65 Table 24 Reporting requirements during dredging and dredge disposal. 68
OMSB Stage 2: DSDMP Page 6 OMSB Pty Ltd 17WAU-0008 /R1702034
Appendices
Appendix A Port of Ashburton Technical Advisory and Consultative Committee – Terms of Reference
Appendix B Environmental Quality Plan
Appendix C Stage 2 Geotechnical Investigation (GALT Geotechnics 2017)
OMSB Stage 2: DSDMP Page 7 OMSB Pty Ltd 17WAU-0008 /R1702034
1. Introduction
1.1. Background Beadon Creek is located approximately 2 km East of the town of Onslow in the Pilbara, within the Shire of Ashburton. Onslow is located 1386 kms north of Perth and 360 kms south of Karratha. The township is 80 km west off the North West Coastal Highway. It is ideally located to service offshore locations including the Mackerel Islands, Barrow Island (Gorgon LNG Plant), Exmouth Gulf, and the Carnarvon Basin (oil and gas reserves) as well as in-land mines including Rio Tinto’s Mesa A site and Pannawonica.
The Beadon Creek Maritime Facility was developed in 1964 and is managed by the Department of Transport (DoT). The facility is used as a harbour for both recreational and commercial activities, but has recently transformed from a small facility supporting local and charter fishing activities to a significant facility supporting the myriad of industrial and commercial activities associated with the growing offshore oil and gas industry in the region. The Beadon Creek Maritime Facility covers an area of 15.29 ha and includes ~260 m wharf face, mooring berths, cyclone moorings, public service wharf, dual public boat ramp, diesel fuelling facilities, public car park and fish cleaning facilities.
In 2012, DoT proposed to upgrade the current facilities in Beadon Creek via the capital dredging of 65,000 m3 of material to create a berth pocket to -2.6 m Chart Datum (CD) and turning basin to a design depth of -1.6m CD, immediately west of the existing channel (BMT Oceanica 2015). The proposed works were referred to the Environmental Protection Authority (EPA) in August 2013 and determined to be 'Not Assessed - Public Advice Given' in April 2014 (EPA 2014).
These upgrade works to the Beadon Creek Maritime Facility were undertaken by DoT in conjunction with Onslow Marine Support Base Pty Ltd (OMSB), as part of Stage 1 of the OMSB Project. Works for this stage included construction of a 2.58 ha land-backed wharf within the existing Beadon Creek Maritime Facility and capital dredging to facilitate the development of a marine support facility. Stage 1 of this project is now nearing completion and OMSB proposes to improve vessel access to the facilities as part of Stage 2 of the project.
1.2. Proposal Summary OMSB Pty Ltd is proposing to modify and extend the Beadon Creek harbour approach channel (HAC), turning circle and berth pocket as part of Stage 2 of the OMSB project. The proposed capital dredging will enable offshore supply vessels to access the newly-constructed OMSB land-backed wharf infrastructure within the DoT managed, Beadon Creek Maritime Facility. Dredge material will be disposed of onshore within surplus land adjacent to the Onslow airport. A detailed description of the Proposal, including the key proposal characteristics is provided in Section 2.
1.3. Proponent The proponent for the Proposal is OMSB Pty Ltd. Proponent details are provided in Table 1.
Table 1 Proponent details
Company Name: OMSB Pty Ltd
Australian Business Number (ABN): 59 167 963 715
Address: Level 3, Suite 24, 25 Walters Drive, Osborne Park WA 6017
Key Contact (Role): Andrew Natta (OMSB Director)
Key Contact Details: Phone: +61 488 888 960
Email: [email protected]
OMSB Stage 2: DSDMP Page 8 OMSB Pty Ltd 17WAU-0008 /R1702034
1.4. Purpose The purpose of this DSDMP is to outline the proposed construction activities required for the project and to identify and manage potential environmental impacts associated with these works. Project specific objectives have been developed to ensure the environmental factors outlined in the EPA Statement (2016) are protected. Specific management actions for both dredging operations and sediment disposal activities have been developed to measure compliance against these specific project objectives.
OMSB Stage 2: DSDMP Page 9 OMSB Pty Ltd 17WAU-0008 /R1702034
2. Description of Works
2.1. Proposal Description OMSB propose to modify and extend the harbour approach channel, turning circle and berth pocket as part of Stage 2 of the OMSB Project. The proposed capital dredging will enable offshore supply vessels to access the newly-constructed OMSB land-backed wharf infrastructure within the Beadon Creek Maritime Facility.
The capital dredging proposed includes a turning basin and channel to a declared depth of - 6.0 m CD and a berth pocket to -8.0mCD, with a total dredge volume anticipated to be approximately 946,450 cubic metres (Figure 1). Dredging will be undertaken using a medium-sized cutter suction dredge (CSD) over a period of approximately eight (8) months.
Dredge material is proposed to be hydraulically transported from the dredge location to the proposed Dredge Material Management Area (DMMA) (Figure 1). The disposal site is located adjacent to the Onslow Airport, within freehold land owned by the Shire of Ashburton (SoA). During dredging, the dredge spoil area will be dewatered to the intertidal flats between the disposal site and the western tributary of Beadon Creek. In accordance with the strategic objectives of the SoA to meet the region’s demand for affordable serviced industrial land, the material is proposed for future reuse to develop and extend the Light Industrial Area in Onslow.
2.2. Proposal Key Characteristics The key characteristics of the dredging and spoil disposal (Construction) elements of the Proposal are summarised in Table 2.
Table 2 Location and proposed extent of physical proposal elements
Element Location Proposed Extent
Physical Elements
Approach Channel Figure 1 Harbour approach channel (HAC) dredge area of 32 ha, with a target depth of -6.0 m CD, width of 55 metres (m) and length of 2 km.
Direct removal of 21 ha of nearshore subtidal benthic communities and habitat (BCH) from within the HAC dredge area.
Turning Basin Figure 1 Turning basin dredge area of 2 ha, with a target depth of -6.0 m CD and a diameter of 143 m.
Berth Pocket Figure 1 Berth pocket dredge area of 3 ha, with a target depth of -8.0 m CD.
Dredge Material Management Area (DMMA)
Figure 1 Onshore spoil disposal area of 44 ha.
Clearing of no more than 15.5 ha of native vegetation within the onshore spoil disposal area.
Channel Navigation Markers Unspecified. Floating (i.e. moored) channel navigation markers (approximately 15) will be installed within the development areas as required.
No removal of BCH is required.
Dredge Material Disposal Pipeline Figure 1 (Two Options Proposed)
450 mm diameter pipeline installed within a 50 m wide pipeline route corridor. Pipeline confined to existing tracks and road reserve. Clearing of 0.3 ha of native vegetation is expected within the pipeline corridor.
Operational Elements
Capital Dredging – Approach Channel
Figure 1 Capital dredging of 773,500 m3 of marine sediment from within the harbour approach channel dredge area to target depth of -6.0 m CD.
OMSB Stage 2: DSDMP Page 10 OMSB Pty Ltd 17WAU-0008 /R1702034
Element Location Proposed Extent
Capital Dredging – Turning Basin Figure 1 Capital dredging of 71,800 m3 of marine sediment from within the Turning Basin dredge area to target depth of -6.0 m CD.
Capital Dredging – Berth Pocket Figure 1 Capital dredging of 101,150 m3 of marine sediment from within the Berth Pocket dredge area to target depth of -8.0 m CD.
Dredge Material Disposal Pipeline Figure 1 Temporary installation of 450 mm diameter onshore pipeline and booster stations within the pipeline corridor to transport dredge material from floating pipeline to DMMA.
Onshore Spoil Disposal to DMMA Figure 1 Disposal of approximately 946,450 m3 of clean, uncontaminated marine sediment to the DMMA.
Onshore Spoil Disposal Dewatering
Figure 1 Controlled discharge of approximately 21 megalitres (ML) per day of dredge spoil return water to the adjacent intertidal catchment of Beadon Creek.
Channel Navigation Markers Unspecified Floating (i.e. moored) channel navigation markers will be installed within the development areas as required.
OMSB Stage 2: DSDMP Page 11 OMSB Pty Ltd 17WAU-0008 /R1702034
Figure 1 OMSB Stage 2 project area, including proposed capital dredging area and spoil disposal location
OMSB Stage 2: DSDMP Page 12 OMSB Pty Ltd 17WAU-0008 /R1702034
2.3. Scope of Construction Work The scope of construction elements of the Proposal includes:
1. Mobilisation and installation of a dedicated Cutter Suction Dredge (CSD); 2. Mobilisation and Installation of all pipeline (floating and land based) including required booster
stations in order to discharge all of the dredged materials in the DMMA; 3. Preparation of the DMMA; 4. Dredging of the Berth Pocket and discharging of dredged materials to the DMMA; 5. Dredging of the Turning Circle and discharging of dredged materials to the DMMA; 6. Dredging of the Harbour Approach Channel (HAC) and discharging of dredged materials to the
DMMA; 7. Dredged materials handling at the DMMA required; 8. Dredge tail water discharge from the DMMA to the adjacent Beadon Creek intertidal area as
required; 9. Pre- and post-dredge hydrographic Survey(s); and 10. Demobilisation and site clearance upon completion of the Works.
2.3.1. Sequencing of the Works
The project allows for all Works to be carried out 24 hours per day, 7 days per week. The planned project sequence is as follows, whereby the tasks listed below may occur concurrently or overlap if multiple work fronts are achievable.
1. Equipment preparation; Inspection; Certification; 2. Preparation of all relevant Project Management Plans; 3. Pre-dredge hydrographic survey and land survey for the disposal area; 4. Mobilisation of all plant and equipment; 5. Site set-up including construction of pipeline(s), road Crossings and Over-paths, but excluding the
installation of the Culvert under Beadon Creek; 6. Preparation of disposal area(s); 7. Commence and complete dredging of Swing Basin and discharging of dredged materials; 8. Commence and complete dredging of HAC-North; HAC-Bend; HAC-A; HAC-B and discharge of
dredged materials; 9. Commence and complete dredging of HAC-South and Berth pocket and discharge of dredged
materials; 10. Progressive Hand-Over Hydrographic Surveys for each section as per item 7-9 above; 11. Final land-survey of “as-placed” dredged materials; 12. Demobilisation and site clearing.
Reference is made to Section 2.3.2 for preliminary construction durations.
2.3.2. Preliminary Construction Schedule
Under the current project schedule, dredging construction activities are planned to commence in Quarter 4, 2017 once all required internal and external approvals are granted. Dredging and onshore spoil disposal is proposed to be undertaken over a period of approximately eight months. An indicative project schedule is presented in Table 3.
OMSB Stage 2: DSDMP Page 13 OMSB Pty Ltd 17WAU-0008 /R1702034
Table 3 Preliminary project construction schedule.
Project Schedule Milestone Estimated Duration
Project Preliminaries 5 Weeks
Mobilisation & Installation 13 Weeks
Dredging & Spoil Disposal (Turning Basin) 5 Weeks
Dredging & Spoil Disposal (Approach Channel inside Training Wall) 10 Weeks
Dredging & Spoil Disposal (Approach Channel Offshore) 13 Weeks
Dredging & Spoil Disposal (Berth Pocket) 2 Weeks
Demobilisation & Site Clearance 3 Weeks
2.4. Mobilisation and Site Installation All plant and equipment including pipeline will be transported via sea and/or public road from the various locations around Australia and the world to the Project Site at Onslow in WA. Two 200T mobile cranes will be mobilised from Karratha to assist with dredge assembly and to lift the dredge and auxiliary equipment into the water. Other required marine equipment (e.g. work boats and crew transfer vessels) will be chartered locally. Relevant required civil plant will be hired locally. Sufficient marine and land based survey equipment will be brought to site to successfully deliver the works. The range of equipment which is intended to be utilised on this project includes items listed in Table 4.
Table 4 Proposed Plant and Equipment
Equipment Name From Transport
Cutter Suction Dredge DAMEN CSD500 The Netherlands Sea / Road
Booster Barge RED DOG Fremantle, WA Road
Multicat DAMEN 1506 China Sea
Booster Station Booster #06 Adelaide, SA Road
Booster Station Booster #07 Adelaide, SA Road
±3.5km of Fl. Pipeline N/A Various, interstate Road
±3.2km of L. Pipeline N/A Various, interstate Road
Various Civil Plant N/A Onslow Road
Auxiliary plant and Equipment Various Various, local and interstate Road
2.5. Site Facility The area which is intended for use for site facilities and lay-down is located on Lot 12 (Now an amalgamated Lot 13) north of the recently completed land backed wharf.
The Lay-Down area will need to provide sufficient storage space to store the containers with spare parts, pipeline, booster stations, etc. A basic site office with relevant amenities will be set-up. This site office will contain all the requirements under the contract as well as the superintendent’s office (if required). A base station for survey will also be installed here to ensure the accuracy of works.
OMSB Stage 2: DSDMP Page 14 OMSB Pty Ltd 17WAU-0008 /R1702034
2.6. Pipeline Installation (Floating) In general, the floating pipeline will run from the back of the dredge to the shore connection. When the pipeline becomes longer than 1300 m, a floating booster station (RED DOG) will be added to the line. The floating pipeline will be supported by floatation devices (buoys) to maintain sufficient buoyancy (and thus visibility) at all times. The Contractor may opt to have a fixed section of the pipeline submerged.
The first section to be dredged is the Turning Basin, which does not require a floating booster – Refer Figure 2.
Figure 2 Floating Pipeline route for dredging Turning Basin
After dredging the Turning Basin, the northern sections of the Approach Channel will be dredged and progressively more floating pipeline will be added. In order to add pipeline, pipeline strings of up to 180 m (15 lengths) will be prepared in advance and will be scheduled to be added when the CSD is not operational (during periods of bunkering and scheduled repairs/maintenance).
The final section to be dredged will be the southern section of the Approach Channel (south of the Turning Basin) and the berth pocket. The length of floating pipeline will be reduced to approximately 500 m.
2.7. Pipeline Installation (Land) The shore pipeline will have a fixed route from the shore connection towards the start of the dredge disposal site. There are a couple of road crossings and overpasses identified of which the major one is the crossing with Beadon Creek Road and the Discovery Park Crossing (Locations per Figure 1).
There will be two fixed land-based booster stations. During discharge operations, additional lengths of pipeline will be added as the site progresses in size.
OMSB Stage 2: DSDMP Page 15 OMSB Pty Ltd 17WAU-0008 /R1702034
2.8. Installation of Cutter Suction Dredge The commissioning activities will take place after the CSD has been assembled and placed in the water. This will include the installation of the latest version of the DREDGEPACK software updated with the design of the various dredge areas.
A number of dredge parameters will be calibrated and the dredge will be towed into position for the first cut.
2.9. Pre and Post Dredge Hydrographic Survey(s) Each identified dredge section (separable portion) within the contract will have an individual pre-dredge hydrographic survey performed to determine as accurately as possible the total volume which is to be removed. Upon completion of the Works in each section, a post dredge hydrographic survey will be carried out to determine if the specifications for that section has been met.
Both surveys (pre- and post) will form part of the final hand-over documents and will serve to calculate the final volumes removed and the payment volume considering the maximum payable depth.
2.10. Dredging A general description of the operations of a CSD is provided in the following paragraphs to provide an overview of how these dredgers operate, , followed by a more detailed description of the methodology specifically for this project.
2.10.1. Basics of Dredging Methodology
A CSD is typically a stationary dredge and consists of a U-shaped pontoon, which is held in position by a fixed spud and two anchors.
OMSB Stage 2: DSDMP Page 16 OMSB Pty Ltd 17WAU-0008 /R1702034
Figure 3 Schematic overview of a Cutter Suction Dredge
The soil is loosened by rotating a cutting head (the “cutter”). The cutter head, which is hydraulically driven, encloses the suction intake of a centrifugal (dredge) pump. The cutter head is mounted at the extremity of a fabricated steel structure (the ‘ladder’), which is attached to the main hull by heavy hinges, enabling rotation in the vertical plane. The ladder assembly is lowered and raised by means of the ladder winch controlled from the operator’s cabin.
Figure 4 Details of a "Rosebud" cutter head
During the dredging activities, the CSD swings around the main spud with the help of its side winches. The operation of the cutter section consists of cutting the seabed with the cutter head and pumping the mixture of water and materials by means of the centrifugal pump into the suction mouth.
The anchors to achieve this movement will be placed in such a manner to minimise intermediate relocation. The total area which a dredge can cover without re-locating its anchors is called the “cut”. Depending on the
OMSB Stage 2: DSDMP Page 17 OMSB Pty Ltd 17WAU-0008 /R1702034
width and length of the dredge area, several “cuts” might be needed. Each “cut” will then have an overlap with another cut to cover the entire dredge area (Figure 5).
Figure 5 Graphical presentation of the work methodology of a CSD
After loosening and suction, the soil is pumped through a floating and/or submersed pipeline, which is connected to the rear end of the CSD, to the allocated discharge location.
2.10.2. Dredging Stage 2
Each identified section will have a pre-dredge survey performed prior to commencement of that section to determine the final cut-plan. The cut-plan will be based on the Box-cut Method (Figure 6). The number of Box-cut layers will be dependent on the soil type and the total depth to be dredged. As such the number of dredged layers within one box can be different. Since the dredged slopes are relative steep, the areas with grey markings in the figure below will collapse and fill the gap below.
Figure 6 Graphical presentation of the Box Cut Method
During the dredging works intermediate surveys will be carried out to monitor the progress and are used for internal planning purposes. Immediately upon completion of a section this will be handed over to the client by means of a post dredge survey. Details of the out-survey method are to be integrated into the contract.
To enable the dredged materials to be transported hydraulically over a length of approximately 5-6 km and to generate a constant flow of material in the pipeline, at least two booster stations have to be installed at
OMSB Stage 2: DSDMP Page 18 OMSB Pty Ltd 17WAU-0008 /R1702034
various locations. The positioning of the boosters are important to guarantee a stable system and to maintain a minimum required pressure level throughout the pipeline alignment.
The total length of the pipeline, the diameter of the pipeline, the constitution of the material transported – friction losses – and the capacity of the CSD determine the capacity and locations of the required booster stations.
2.10.3. Survey Works
The survey works consists of both hydrographic and topographic surveys. Hydrographic surveys will be carried out for dredging works whilst Topographic Surveys will be carried out for the Reclamation Works.
2.10.4. Hydrographic Survey
A shallow-draught survey vessel will be operated during the works to monitor the progress of the dredging operations. Survey operations will mainly consist of bathymetric soundings, using conventional single-beam (dual frequency) echo-sounders.
All surveys will be carried out along pre-determined cross lines at 20m intervals with cross check lines every 100m and all the pre-determined lines will be extended in order to cover 50m on either side of the design toe lines.
2.10.5. Pre-and Post-Dredge Surveys
Pre-dredge hydrographic surveys will be performed prior to all dredging works to determine a baseline for the performance of the dredging works. This survey will also determine the total quantity of materials which need to be removed from each dredge area.
Upon completion of each individual dredge area, a post dredge hydrographic survey will be carried out to achieve Practical Completion for each Dredge Area. A complete set of A3 sized “as-dredged” drawings will be submitted for the scope of works.
2.10.6. Topographic Survey
Topographic grid will form 20m interval profiles across the reclamation area, covering all surface variations. Containment bunds will be surveyed in profiles of 20m interval. Reclamation progress will be monitored by topographic survey. A plane laser will be set-up to control the fill to design levels.
2.10.7. Cutter Suction Dredge (Damen Cutter Suction Dredger CSD450)
A Damen CSD450 dredger is proposed to be used for the Project. The dredger and specifications are presented in Figure 7.
OMSB Stage 2: DSDMP Page 19 OMSB Pty Ltd 17WAU-0008 /R1702034
Figure 7 Damen Cutter Suction Dredger CSD 450 specifications (DAMEN 2017)
2.10.8. Process Control
The dredging and disposal process is largely controlled by computing software and the vessels positioning system. The dredge software package to be utilised is the DREDGEPACK Dredge Operations Software. This software and hardware package is specifically designed to monitor the exact position and depth of the cutter head and keeps track of the computed “as dredged” surface.
The positioning system will be Differential Global Positioning System, DGPS in combination with a tidal receiver. The output of this positioning system will be X, Y and Z co-ordinates of the vessel. Cutter position is determined relative to the ship by means of an angle transducer, measuring the angle between the cutter ladder and the horizontal. The x, y, and z of the cutter position is calculated by the dredge computer. With this software package and in combination with regular hydrographic surveys it is possible to accurately calculate the quantity of materials moved during a shift. Regular hydrographic surveys will be performed in co-ordination with the Client to check the actual progress of the dredge, which will be used for reporting purposes.
2.11. Onshore Dredge Spoil Disposal Dredge material is proposed to be disposed onshore within the DMMA, which is situated south west of the Beadon Creek Road at the back of the current industrialised area. The DMMA will be prepared by stripping the existing topsoil and stockpiling it at strategic locations surrounding the disposal site(s).
The dredged materials will be transported to the DMMA via a series of pipelines and booster stations as described in Sections 2.6 and Section 2.7. At the DMMA, the discharge lines will be subdivided into branches. The initial discharge pipeline layout will be installed using standard civil plant. The dredged materials will be pumped in a controlled and sequenced manner into the respective sections of the DMMA. Filling will progress from the point of discharge (i.e. the outlet of the dredging discharge pipe). Controlling and managing the filling process will be achieved by monitoring and spreading the fill material using earthmoving equipment
Dredger Specifications
Production Rate: 3,000 m3/h
Dredging Depth: 12 m
Total Installed Power: 941 kW
Total Weight: 115 T
Pipe Diameter: 450 mm
OMSB Stage 2: DSDMP Page 20 OMSB Pty Ltd 17WAU-0008 /R1702034
such as bulldozers and hydraulic excavators. After the fines have settled out the dredge water will be tailed to Beadon Creek via a controllable valve.
2.11.1. Dredge Material Disposal Strategy
A Dredge Material Disposal Strategy (DMDS) is to be developed prior to the commencement of construction works. The DMDS will:
• Define various stages of the spoil disposal;
• Include a plan showing the locations, characteristics and dimensions of weirs, culverts and outfalls;
• Consider and describe flow paths through the DMMA and settling basins;
• Describe the layout and utilisation of settling basins to ensure that the Suspended Solids Concentration (SSC) levels are minimised at the outflow location towards the Beadon Creek;
• Provide information on the quantity and characteristics of material to be pumped into the DMMA, including results of geotechnical assessment of the material;
• Address the practical constraints regarding initial perimeter bund construction; and
• Present the modelling outcome to demonstrate how the proposed DMDS will achieve target SSC at the tail water discharge outfall.
Preliminary considerations for the DMDS are described in Section 2.11.2, 2.11.3 and 2.11.4 below.
2.11.2. Bund Design
A bund design will be prepared based on DMMA subsoil stratigraphy and conditions regarding width and height of the bund. The bund design will be checked for geotechnical stability. The stability analyses will include limit equilibrium methods to compute the safety factor of the slopes like the Bishop critical slip circle analysis. The Bishop circular failure calculations are based on moment equilibrium along a circular failure envelope through the slope. For this method, no interslice shear forces are considered. Furthermore, the bund stability will be checked for horizontal/lateral sliding. The resulting safety factors are defined as the ratio between the driving and the resisting forces or moments.
Safety factors will be established as part of the design. Safety factors depend on coverage (planar as well as vertical) of soil information and the type of strength parameter tests performed during the soils investigation.
2.11.3. Design Conditions and Reference Information
Initial Considerations
The DMMA must be designed and operated to provide adequate initial storage capacity and surface area to hold the dredged materials during the filling operations and to retain the suspended solids such that clear water is discharged (USACE, 2015).
Required fill quantities & dredge productions
A total quantity of about 946,450m3 of dredged materials will be discharged into the DMMA. All materials will be dredged by means of a medium Cutter Suction Dredge (CSD) and hydraulically transported towards the DMMA via a combination of floating and shore pipelines and booster stations. The following average productions and discharge levels are envisaged for this CSD:
• Medium CSD production: 500 m3/net operational hour (solids); and
• Medium CSD discharge rate: 1.0 m3/s (total flow).
Productions will be lower in the outer areas of the channel.
OMSB Stage 2: DSDMP Page 21 OMSB Pty Ltd 17WAU-0008 /R1702034
Soil characteristics and fines contents
OMSB Stage 1 - Dredge Material Classification
A geotechnical assessment of materials dredged during Stage 1 has been carried out by Galt Geotechnics and is reported via a Technical Memorandum on 30 May 2017. This assessment was used in conjunction with the Stage 2 results presented below to provide a preliminary determination of the dredged soil characteristics for Stage 2 Dredging works.
On the basis of this assessment, the following commentary was made regarding the classification of the soil (GALT Geotechnics 2017a):
Based on the laboratory test results, the proposed material generally meets the requirement for not being classified as unsuitable material under Clause 4.4.3, with the following comments made regarding the material:
• The material is classified as SAND (SP);
• The material does not have significant components of clayey, silty or organic fines (less 5%), and is non plastic;
• The material does not contain particles greater than 75mm;
• The material does not contain deleterious materials (rubbish, debris, vegetable matter, wood and roots); and
• Under compaction the gravel (shells) generally breaks down into sand sized fragments, not clay sized.
The Particle Size Distributions (PSD) of three samples of the sands envisaged to be dredged and placed in the DMMA have been summarized in Figure 2. The D50 of these sands is about 340 μm while the D10 is approximately 150 μm, with approximately 10% of the materials classified as gravel (Galt Geotechnics 2017):
Figure 8 Particle Size Distribution OMSB Stage 1
The PSD results indicate that well over 90% of the material is typically classified as either sand or gravel, with less than 5% of silts (finer than 60 μm).
OMSB Stage 2: DSDMP Page 22 OMSB Pty Ltd 17WAU-0008 /R1702034
OMSB Stage 2 - Dredge Material Classification
Classification of Stage 2 dredge material is provided below based on historic geotechnical investigation (CHM2HILL 2014), environmental sediment quality investigations (O2 Marine 2017) and targeted geotechnical investigation (GALT 2017).
The environmental sediment quality investigations undertaken by O2 Marine (2017) provided a summary of the sediment characteristics identified during historic sampling by CHM2HILL (2014) (Table 5) and during the O2 Marine (2017) sediment quality investigation (Table 6). Although it is noted that the O2 Marine (2017) investigation was primarily focussed on surface sediments, with sampling to -1.5 m CD in the berth pocket/turning circle, -1.2 m CD in the inner channel and -1.0 m CD in the outer channel.
Table 5 Geotechnical test results for engineering geological units (CH2MHILL 2014)
Tests Marine/Estuarine
Deposits
Tantabiddi
Member
Upper Onslow
Red Beds
Lower Onslow
Red Beds
Top of horizon +1-0 m CD -1-1.6 m CD -1-4 m CD -6.2-10 m CD
Thickness 2-6.5 m 0-2.4 m 3-6 m Extends below 13 m CD
Moisture (%) 16.1-40.8% N/A 14.5-24% -
TOC (%) <5% N/A - -
PSD Gravel 0-27% N/A 0-39% 0-5%
Sand 41-95% N/A 9-74% 28-55%
Fines 3-45% N/A 14-71% 42-68%
Table 6 Descriptive statistics of sediment PSD from the berth pocket/turning circle, inner channel and outer channel
Area Statistic Clay (%) Silt (%) Sand (%) Gravel (%)
Berth Pocket/ Turning Circle
Sampling Depth (to -1.5 m CD)
Min 0 0 51 0
Max 29 20 97 13
Mean 8.2 5.2 83.5 3.2
SD 11.1 7.6 16.7 5.4
n 6 6 6 6
Inner Channel
Sampling Depth (to -1.2 m CD)
Min 0 0 73 0
Max 11 5 99 25
Mean 2.1 1.2 85 11.7
SD 3.4 1.5 9.4 8.5
n 9 9 9 9
Outer Channel
Sampling Depth (to -1.0 m CD)
Min 0 0 65 1
Max 9 9 99 25
Mean 3.8 2.8 79.9 13.5
SD 2.5 2.5 10.8 8.1
n 12 12 12 12
OMSB Stage 2: DSDMP Page 23 OMSB Pty Ltd 17WAU-0008 /R1702034
Subsequent targeted geotechnical assessment of the dredge material was undertaken by Galt Geotechnics (2017). The GALT (2017) study considered the historic sampling results described above and the results of targeted geotechnical investigation (Boreholes) at 12 locations. A copy of the Geotechnical report is included in Appendix C. The GALT (2017) report concluded the following in regard to the Stage 2 dredge material:
The materials encountered in the boreholes were logged in accordance with AS 1726 (2017) “Geotechnical site investigations” and typically comprised:
Silty SAND and Clayey SAND – fine to coarse grained, some calcareous gravel and cobbles including some to many shells.
The standard states that fines content of these soils ranges from 12% to 35% fines. It must be pointed out that significant core loss occurred and the classification of these soil types was based on the recovery of only a small amount of sample.
In an offshore borehole (BH14) drilled as part of an earlier geotechnical study, conducted in May 2014 by CH2MHILL within Beadon Creek, soils encountered mainly comprised sand with layers of silt, silty sand, clayey sand and clayey silt. Laboratory testing of two selected samples of the more fine-grained samples showed that these samples contained 33% and 37% fines (particles <0.075 mm size).
In a later sediment quality assessment, conducted in March 2017 by O2 Marine, samples were collected using vibro-coring techniques and grab sampling. The sample locations comprised within Beadon Creek, the inner channel and the outer channel. Particle size distribution testing conducted on a total of 40 samples showed the fines contents1 ranged as per below:
• Beadon Creek (9 samples): Range 1-53%; Mean 15%
• Inner Channel (15 Samples): Range 1-22%; Mean 6%
• Outer Channel (16 Samples): Range 1-18%; Mean 10%
The amount of fines visually assessed in this investigation appears to be consistent with those determined in testing conducted in the CH2MHILL (2014) and O2 Marine (2017) studies.
Based on the assessment provided above the fines content is assumed to range between approximately 5 – 15% on average, with occasional isolated pockets of higher fines content (i.e. up to 50%) expected to be encountered within Beadon Creek.
Necessity of Bunds
The natural slope angles of fill after hydraulic placement are usually (very) gentle and for this particular site will be mainly dependent on the placement method and particle size distribution of the fill. The majority of the sand pumped will have a grain size of 0.2mm-2mm and will have a slope of between 1:10 – 1:100 (van ‘t Hoff 2013). By constructing bunds and profiling their slopes to their required stable slope angle it is possible to limit the total area of fill.
Initial perimeter bunds will be constructed around the fill and settling basins. The bunds to be placed prior to hydraulic filling will be constructed from locally available materials from within the DMMA. As the available quantity of this material is scarce, bunds need to be constructed with a minimum amount of material. The bund height is governed by the minimum water level inside the settlement basins (see Section 2.11.4), while the side slopes of the bunds are governed by the geotechnical stability of the bund.
1 Difference in fines content values reported in GALT (2017b), compared with the O2 Marine (2017) summary information for Clay and Silt presented in Table 6 is due to difference in grain size classification, i.e. fine particles <0.075 mm size in GALT (2017b) and <0.06 mm size in O2 Marine (2017).
OMSB Stage 2: DSDMP Page 24 OMSB Pty Ltd 17WAU-0008 /R1702034
Intermediate (management) bunds or berms will also be constructed within the confines of the DMMA. These bunds will function to direct the flow of sediment mixture and maximise the settlement regime within the DMMA. These bunds will not need to be engineered bunds and will just be pushed up from within with locally available materials.
2.11.4. DMMA Layout
Staging of the Disposal Process
In order to ensure that the dredged materials are all disposed within the designated DMMA, the area has been divided into three main sections as indicated in figure 3 below.
The eastern part of the DMMA is currently a low-lying area of minimal bearing capacity and not accessible by continuous use of heavy construction equipment. This area is identified as “Area A”. The average height of Area A is between 0.0m AHD and 1.0m AHD. Area B has been identified as an area with sufficient bearing capacity to allow continuous use of heavy construction equipment. Area C is currently used as a settlement area for stormwater run-off from the airport and will be used as the area for settlement of fines from the disposal process.
Figure 9 DMMA layout
In order to provide for a level DMMA ensuring safe access for all equipment throughout the works, the following stages have been envisaged:
Stage 1: Area A Improvement
Initially this area will be filled with approximately 1m of hydraulically placed sand to a level of about 2m AHD to allow access for excavators and bulldozers. An estimated 150,000 m3 of sand will be placed in this phase.
Stage 2: Area A Levelling
After Area A has been improved, the overall level of this area will be raised to about 4m AHD. An estimated 400,000 m3 of sand will be placed in this phase.
OMSB Stage 2: DSDMP Page 25 OMSB Pty Ltd 17WAU-0008 /R1702034
Stage 3: Final Filling
In stage 3 the remainder of the DMMA will be filled. About 400,000 m3 is estimated to be placed here and will cover both Area A and Area B.
DMMA Layout for each Phase
The main objective when filling over soft soils is to place the fill in a manner which does not lead to instability and the formation of mud waves and maximises the settlement regime for fines This is particularly important when the fill material is granular and of markedly differing engineering characteristics to the substrate (Bray et al. 1997).
Stage 1
As only a layer of approximately 1m of fill is required in this phase to an approximate level of 2m AHD, an initial bund will be constructed with locally available materials using a LGP Bulldozer (Figure 10).
Figure 10 Dredge Spoil Disposal Stage 1
This bund will only be marginally engineered and will only function as a barrier for the dredged materials. Typical bund dimensions are:
• Crest level: 2.5m AHD
• Approximate crest width: 2.5m
The water levels within the DMMA need to be kept low. Therefore, the water level within the settling basin (Area C) needs to be kept at approximately 1.5m AHD to allow sufficient drainage from Area A. This will be accomplished with a weir-box at the southern end of Area A with flexible overflow. The northern end of Area C will have a management bund in order to reduce the outflow of water and encourage settlement of fines. Most of the fines will be captured in Area C. Sufficient number of intermediate bunds will be constructed in order to increase the length of the sedimentation pathway.
MANAGEMENT BUND (ENVIRONMENTAL MONITORING LOCATION)
OMSB Stage 2: DSDMP Page 26 OMSB Pty Ltd 17WAU-0008 /R1702034
Stage 2
The perimeter bund is constructed by utilising previously placed dredged fill material adjacent to the bund where the bund is constructed (Figure 11). Typical bund dimensions are:
• Crest width: 3m; and
• Crest level: 4.5m AHD
During Stage 2 filling, internal DMMA bunds will be constructed by using fill material placed during Stage 1 by LGP bulldozers. The function of these bunds is to maximise settling distance within the DMMA and to guide the tail water through the weir box to Area C.
Figure 11 Dredge Spoil Disposal Stage 2
Stage 3
During the final Stage of the works, the perimeter bund is constructed by borrowing material adjacent to the bund where the bund is constructed on previously placed fill. Typical bund dimensions are:
• Crest width: 5.5m
• Crest level: 5.9m AHD
The final composition of the bund will be as per the engineered design thereof. Sequencing of the fill will follow a similar pattern as for stage 2.
Depending on the total quantity of fines which were not captured within the DMMA it may be necessary to construct a secondary bund from the northern end of the Airport’s runway towards the Eastern bund of the DMMA in order to ensure that all remaining fines are captured within the Settling Basin (Area C) (Figure 12)
The tail water from all Stages of disposal will enter the settlement basin on the far southern end of the DMMA.
MANAGEMENT BUND (ENVIRONMENTAL MONITORING LOCATION)
OMSB Stage 2: DSDMP Page 27 OMSB Pty Ltd 17WAU-0008 /R1702034
Flow paths of the tail water will run across the settling basin from south to north and the tail water will then be drained via the northern bund back to Beadon Creek. To pass this bund, two weir-boxes each with four pipes will be placed within the bund in order to spread the flow path across the width of the northern bund and avoid unnecessary erosion. The over-flow level within the weir boxes will have to be placed at an even level to ensure an evenly distribution of flow.
Figure 12 Dredge Spoil Disposal Stage 3
MANAGEMENT BUND (ENVIRONMENTAL MONITORING LOCATION)
2x WEIR BOX
OMSB Stage 2: DSDMP Page 28 OMSB Pty Ltd 17WAU-0008 /R1702034
Estimated Suspended Solids Concentration of Tail Water
The following assumptions and starting points are adopted in the estimations:
1. 50% of the fines remain within the soil matrix of the fill and hence do not wash out during the
hydraulic filling process; and
2. Fines content of the sands are reported in Section 2.11.3 and are assumed to on average,
range between 5-15%2.
Stage 1
In the first layer it is estimated that approximately 150,000 m3 of sands will be placed in Area A. As the overflow at the weir box is to be kept low in order to quicken the dewatering of Area A, initially the settling basin will be the only area for the settling of fines.
The total quantity of fines during this phase is estimated to be about 7,500m3 of which 50% is assumed to remain within the soil matrix. This means that only about 3,750m3 of fines will settle within the settlement basin. As the settlement area is approximately 68,000m2, this results in an average layer of about 5-6cm which technically does not require a management bund at the northern end of the settlement area. However, as the velocity of the tail water at the weir is relative large, some erosion prevention solution should be adopted. Hence it is therefore good practice to have a management bund at the northern end of Area C from when the works commence.
In the unlikely event that a higher content of fines are detected at the discharge point during stage 1 of the works, additional intermediate bunds will be constructed within Area C, to increase the length of the sedimentation pathway. By placement of intermediate bunds, the sedimentation pathway can be doubled or even tripled if required.
Stage 2
The second stage requires approximately 400,000 m3 of sands. The bunds surrounding the DMMA have now been built in accordance with an engineered design and will be able to hold some excess water. As such the overflow at the weir box can be kept a little higher so that part of Area A will become a settlement area for fines in addition to Area C.
The total quantity of fines during this phase is estimated to be about 20,000m3 (5%1) of which 50% is assumed to remain within the soil matrix and 25% settles at the southern end of the DMMA before it leaves through the weir box. This means that only about 5,000m3 of fines will settle within the settlement basin. This adds another 7-8cm on average to Area C.
Stage 3
Similar to stage 2, the third stage requires another 400,000 m3 of sand. The total quantity of fines during this phase is estimated to be about 20,000m3 (5%1) of which 50% is assumed to remain within the soil matrix and 25% assumed to settle at the southern end of the Reclamation Area before it leaves through the weir box. This means that only about 5,000m3 of fines will settle within the settlement basin. This adds another 7-8cm on average to Area C bring the total of area C to approximately 14 – 16cm.
2 Fines contents estimated based GALT Geotechnics (2017) report provided in Appendix C.
OMSB Stage 2: DSDMP Page 29 OMSB Pty Ltd 17WAU-0008 /R1702034
3. Stakeholder Consultation
3.1. Stakeholder consultation In developing this DSDMP, and throughout the environmental approvals process, OMSB has undertaken consultation with a number of key stakeholders, including:
• Beadon Creek Maritime Facility Users, including: o Bhagwan Marine; o Chevron Australia; o Eco Tours and Mackerel Island Group; o Total AMS;
• Department of Biodiversity Conservation and Attractions (DBCA);
• Department of Primary Industries and Regional Development (DPIRD);
• Department of Transport (DoT);
• Department of State Development (DSD);
• Department of Water and Environment Regulation (DWER);
• Discovery Parks;
• Onslow Chamber of Commerce and Industry (OCCI);
• Pilbara Ports Authority (PPA);
• Shire of Ashburton (SoA);
• Thalanyji Aboriginal People; and
• Western Australian Fisheries Industry Council (WAFIC) (i.e. Representing local commercial fishing licence holders).
OMSB has committed to ongoing consultation with these key stakeholders throughout the proposed Stage 2 dredging and onshore spoil disposal activities. Ongoing consultation will include OMSB reporting through the Port of Ashburton Technical Advisory and Consultative Committee (TACC) and this process is described in Section 3.2 below.
3.2. Dredging Technical Advisory and Consultative Committee A TACC was established by PPA for the Port of Ashburton in early 2017 to support the implementation of effective, transparent and timely engagement with stakeholders who may have an interest or be affected by dredging programs within the PPA-managed Port of Ashburton (Located adjacent to the Proposal area).
The TACC meets approximately twice per annum (i.e. April and October) or more frequently as required, such as during dredging campaigns. The TACC typically includes representation from:
• Chevron Australia; • DoEE; • DBCA; • DPIRD; • DoT; • DSD; • DWER; • OCCI; • OMSB; • Onslow Salt; • PPA; and • Buurabalayji Thalanyji Aboriginal Corporation (BTAC).
OMSB Stage 2: DSDMP Page 30 OMSB Pty Ltd 17WAU-0008 /R1702034
In addition to the above stakeholders, the Chair may invite specialist consultants to attend meetings and provide input to the TACC on specific issues. Advice may also be sought from specialist consultants through the Chair outside TACC meetings.
The main objective of the TACC is to ensure a transparent process with respect to dredging and disposal of dredged material. The purpose of the TACC is to:
• Keep stakeholders informed on maintenance dredging activities; • To provide continuity of direction and effort for environmental protection matters related to
dredging and ocean disposal of dredged material; • Provide a forum for communication and resolution of any issues that may arise that
stakeholders would like to be addressed; • Assist in establishment of long-term permitting arrangements, including review over
development and implementation of: o Sampling and Analysis Plans; o Long-term Dredge Material Management Plans; and o Other research and monitoring programmes.
• Review on-going management of dredging and ocean disposal activities in accordance with guidelines and permits; and
• Make recommendations as appropriate.
Although not identified as a decision-making authority for the OMSB Stage 2 Proposal, the PPA invited OMSB Pty Ltd to participate as a Member of the TACC during the dredging phase of the OMSB Stage 2 Proposal. The primary aim of engagement through the TACC regarding the OMSB Stage 2 Proposal is to enable open and transparent reporting of environmental performance against the management commitments made within the DSDMP. It is also envisaged that the TACC will offer independent advice to OMSB Pty Ltd regarding effective implementation of the environmental management commitments made within the DSDMP.
Given the TACC is already established in the region, and includes representation from most key stakeholders of the OMSB Stage 2 Project, this opportunity is considered to provide significant confidence to key stakeholders (including DWER), that OMSB Pty Ltd is committed to achieving a high standard of environmental management and performance on the Project.
Further information regarding the role and scope of TACC is provided in the Terms of Reference, which is included in Appendix A.
OMSB Stage 2: DSDMP Page 31 OMSB Pty Ltd 17WAU-0008 /R1702034
4. Roles and Responsibilities
The roles and responsibilities for the implementation of the DSDMP are summarised in Table 7.
Table 7 Roles and Responsibilities of Key Personnel
Position Responsibility
Proponent • Overall responsibility for implementation of this DSDMP.
• Overall responsibility for complying with all relevant legislation, standards and
guidelines.
• Ensures dredging activities are conducted in an environment safe for both site
personnel and the public.
• Reports on environmental performance for the project to relevant DMAs (i.e.
DoT – dredging and SoA – Onshore disposal) and to the TACC.
• Responsible for reporting all environmental incidents to relevant DMAs.
Proponent’s Representative (Construction Manager)
• Complies with the requirements of this DSDMP.
• Provides advice on dredging and dredge material management related
environmental issues.
• Oversee implementation of environmental controls, monitoring programs,
inspections, audits and management actions in this DSDMP.
• Completes compliance reporting requirements.
• Responsible for the implementation of the environmental monitoring programs
and inspections.
• Prepares environmental monitoring reports.
• Provides advice with respect to environmental issues as required.
Dredging Contractor • Prepares and implements an environmental management plan in accordance
with the requirements of this DSDMP.
• Implements the management actions of this DSDMP.
• Ensures adequate training of all staff within their area of responsibility.
• Ensures all equipment is adequately maintained and correctly operated.
• Responsible for reporting all environmental incidents to OMSB Environmental
Advisor within 24 hours in accordance with OMSB incident reporting
procedures.
All persons involved in the project.
• Comply with the requirements of this DSDMP.
• Comply with all legal requirements under the approvals documents and
relevant Acts.
• Exercise a Duty of Care to the environment at all times.
• Report all environmental incidents
OMSB Stage 2: DSDMP Page 32 OMSB Pty Ltd 17WAU-0008 /R1702034
5. Environmental Factors and Objectives
The environmental factors and objectives to be managed under this DSDMP have been derived from the Statement of Environmental Principles, Factors and Objectives (EPA 2016), which outlines objectives aimed at protecting all environments (Themes) including: Sea, Land, Water, Air and People. In consideration of potential environmental impact pathways associated with the proposed dredging and onshore spoil disposal activities, subsequent project specific Environmental Protection Outcomes (EPOs) and Management Targets (MTs) were derived and these are outlined in Table 8.
Table 8 Potential environmental impacts and associated project specific Environmental Protection Outcomes and Management Targets.
3 EPOs and MTs are to be updated following receipt of ministerial conditions that may be applicable to the project.
Environmental
Factor
EPA Objective Potential Environmental Impact Pathway Environmental Protection Outcome (EPO)3 Management Target Management Measures
THEME: SEA
Benthic
Communities
and Habitats
(BCH)
To protect BCH so that
biological diversity and
ecological integrity are
maintained.
Direct impacts of BCH due to removal of
sediment within the dredge footprint.
Permanent loss of BCH within the Zone of High
Impact (ZoHI).
Dredging operations do not occur
outside the defined dredge footprint.
Table 9
Indirect impacts of benthic communities
and habitats due to increased Total
Suspended Sediment (TSS) levels and
subsequent reduction in available light –
caused by suspended sediments released
into the water column during dredging and
discharge of spoil water.
Indirect irreversible loss of subtidal BCH within
the ZoHI.
Recovery of subtidal BCH within the Zone of
Moderate Impact (ZoMI) worst-case scenario
within 5 years following disturbance.
No detectable impact on subtidal BCH within the
Zone of Influence (ZoI) worst-case scenario.
* Note – Extent of ZoMI and ZoI varies
depending on the season in which dredging is
conducted. Refer to Figure 15 (Winter), Figure 16
(Transitional) and Figure 17 (Summer).
Recovery of subtidal BCH within the ZoMI
worst-case scenario within 3 years
following disturbance.
No detectable impact on subtidal BCH
within the Zone of Influence (ZoI) best-
case scenario.
* Note – Extent of ZoMI and ZoI varies
depending on the season in which
dredging is conducted. Refer to Figure
15 (Winter), Figure 16 (Transitional) and
Figure 17 (Summer).
OMSB Stage 2: DSDMP Page 33 OMSB Pty Ltd 17WAU-0008 /R1702034
Turbidity impacts on benthic habitats
resulting from tail water discharge
operations.
Manage water quality to achieve a Moderate
Level of Ecological Protection at the DMMA Tail
water discharge.
Manage water quality to achieve a High
Level of Ecological Protection at the
DMMA Tail water discharge.
Coastal
Processes
To maintain the geophysical
processes that shape coastal
morphology so that the
environmental values of the
coast are protected.
Changes to hydrodynamics and coastal
morphology resulting in indirect
modification of intertidal communities.
Dredging operations do not occur outside the
defined dredge footprint.
Dredging operations do not occur
outside the defined dredge footprint.
Table 10
Marine
Environmental
Quality
To maintain the quality of
water, sediment and biota so
that environmental values are
protected.
Disturbance of contaminants in sediments
during dredging and tail water discharger
has the potential to deteriorate water
quality and contaminate marine organisms.
Post-development marine environmental quality to achieve the requirements of the EQP for Beadon Creek. (Refer to Appendix B)
Maintain water quality to meet:
• A High Level of Ecological Protection at the tail water discharge (Weir box) and in the western tributary of Beadon Creek (BCW); and
• A High Level of Ecological Protection in the eastern tributary of Beadon Creek
Table 11
Changes to the physico-chemical
properties of the water column as a result
of dredging and tail water discharge.
There is potential for a hydrocarbon
release into the marine environment from
a vessel spill and or bunkering operations.
Manage vessel bunkering, chemical
storage and spill response to ensure no
adverse impacts to the marine
environment.
Changes to water quality in the vicinity of
the Onslow Salt Seawater intake has the
potential to result in adverse impacts upon
Onslow Salt’s operations.
Maintain water quality to meet industrial
water supply criteria for Onslow Salt’s
seawater intake.
Marine Fauna To protect marine fauna so
that biological diversity and
ecological integrity are
maintained.
Turbidity impacts on marine fauna. No harm of individuals and/or declines in the
population of the range of species protected
under state legislation.
No reductions in populations of species of local
and regional importance.
No reported incidences of marine fauna
injury or death as a result of turbidity
impacts.
Table 12
Injury or death of marine fauna as a result
of dredge operations.
No reported incidences of marine fauna
injury or death as a result of dredge
operations.
OMSB Stage 2: DSDMP Page 34 OMSB Pty Ltd 17WAU-0008 /R1702034
Injury or death of marine fauna due to
vessel movement (strike).
No impacts to species or groups of species that
fulfil critical ecological functions within the
system.
No loss or impact to critical marine fauna
habitat, including nesting beaches, nursery
areas, specific foraging or breeding areas and
fish spawning aggregation areas.
No reduction in the biodiversity of marine fauna
in the area.
No reported incidences of marine fauna
injury or death as a result of vessel strike.
Introduced Marine Pests (IMP)
translocation from construction or
operational vessels.
No introduction and/or spread of invasive
marine species or diseases.
Minimise the risk of IMP translocation to
protect biological diversity and integrity.
THEME: LAND
Flora &
Vegetation
To protect flora and vegetation
so that biological diversity and
ecological integrity are
maintained.
Vegetation removal or disturbance for the
pipeline route and/or spoil disposal site.
Direct removal of a maximum of up to 15.8 ha of
native vegetation.
No unauthorised vegetation clearing. Table 13
No impact on conservation significant flora
species.
No impact on conservation significant
flora species.
Translocation of weeds to adjacent areas. Minimise the potential for translocation
of weeds.
Terrestrial
Environmental
Quality
To maintain the quality of land
and soils so that
environmental values are
protected.
Disposal of marine based ASS at spoil
disposal site.
Assess and manage marine sediment ASS to
maintain the quality of land and soil.
Assess and manage marine sediment ASS
to maintain the quality of land and soil.
Table 14
Disturbance of existing ASS at the
proposed disposal site.
Assess and manage land based ASS to maintain
the quality of land and soil.
Assess and manage land based ASS to
maintain the quality of land and soil.
Terrestrial
Fauna
To protect terrestrial fauna so
that biological diversity and
Removal/smothering of terrestrial fauna
habitat.
No unauthorised vegetation clearing. No unauthorised vegetation clearing. Table 15
OMSB Stage 2: DSDMP Page 35 OMSB Pty Ltd 17WAU-0008 /R1702034
ecological integrity are
maintained. Disturbance of conservation significant
terrestrial fauna.
No impact on conservation significant fauna
species.
Disturbance to the foraging and feeding
habitats of migratory birds
No impact on migratory bird habitats. Manage dredge and construction
operations to minimise disturbance of
migratory bird foraging and feeding
habitats.
Attraction of migratory birds to spoil
disposal site due to ponding water.
Manage site conditions to minimise the
potential for migratory birds to gather in
the spoil disposal site.
THEME: WATER
Hydrological
Processes
To maintain the hydrological
regimes of groundwater and
surface water so that
environmental values are
protected.
Altered surface water runoff patterns. Manage construction works and water
discharge to maintain surface runoff
patterns.
Table 16
THEME: AIR
Air Quality To maintain air quality and
minimise emissions so that
environmental values are
protected.
Dust generation from stockpiles. Impacts from dust are confined to the project
development areas.
Manage construction works to minimise
impact on air quality.
Table 17
THEME: PEOPLE
Social
Surrounds
To protect social surroundings
from significant harm.
Disturbance of a significant aboriginal
heritage site.
No disturbance of any aboriginal heritage site. Site boundaries and construction works
will be managed to protect social
surroundings form significant harm.
Table 18
OMSB Stage 2: DSDMP Page 36 OMSB Pty Ltd 17WAU-0008 /R1702034
6. Management
The potential environmental impacts identified above in Table 8, have been assigned monitoring and management actions to measure compliance against the EPOs4 and MTs. Management measures for each environmental factor (EPA, 2016) are detailed below.
6.1. Benthic Communities and Habitats Management proposed to minimise potential impacts on the environmental factor ‘Benthic Communities and Habitat’ are described in Table 9.
Table 9 Management actions to minimise impacts on Benthic Communities and Habitats.
Environmental Factor Benthic Communities and Habitats
Activity Dredging and tail water discharge.
Potential Impacts Direct loss of benthic communities and habitats due to dredging activities.
Indirect loss of benthic communities and habitats due to increased Total Suspended Sediment (TSS) levels and subsequent reduction in available light – caused by suspended sediments released into the water column during dredging and discharge of spoil water.
Management Targets Management Actions Environmental Performance
Item Actions Responsibility Reporting/Evidence Timing Contingency
Dredging operations do not occur outside the defined dredge footprint.
9.1 Undertake a HAZID risk assessment to identify potential impacts on benthic communities and habitats.
Proponent • Assessment included in referral support document.
• Prior to commencement of dredging.
• N/A - Completed
9.2 Utilise a satellite-based vessel monitoring system on the dredge to ensure no dredging occurs outside the planned area.
Contractor • Inspection of satellite-based vessel monitoring system,
• Dredge progress reports submitted to the proponent throughout dredging.
• Prior to and during dredge operations.
• Weekly throughout dredging
• Cessation of dredging and relocation of dredge; and
• Maintenance of tracking system.
9.3 Verify calibration of the hydrographic survey systems onboard the dredge.
Contractor • Provide calibration documentation.
• Prior to commencement of dredging.
• Dredging to commence only after calibration certification for survey equipment is verified.
4 EPOs identified in Table 8 are not presented in the following tables as it is assumed that if the MT is achieved then the corresponding EPO will also be achieved.
OMSB Stage 2: DSDMP Page 37 OMSB Pty Ltd 17WAU-0008 /R1702034
Recovery of subtidal BCH
within the ZoMI worst-
case scenario within 3
years following
disturbance.
No detectable impact on
subtidal BCH within the
Zone of Influence (ZoI)
best-case scenario.
Note – Extent of ZoMI and ZoI varies depending on the season in which dredging is conducted. Refer to Figure 15 (Winter), Figure 16 (Transitional) and Figure 17 (Summer).
9.4 Implement the Marine Water Quality Monitoring Program (MWQMP) described in Section 8.1.
Proponent • Telemetered monitoring data (light)
• Daily MODIS imagery (Plume extent)
• MWQMP monthly reports and final report.
• Commence at least eight weeks prior to starting dredging in the HAC offshore area and continue until at least two weeks following completion of dredging.
• Implement Tiered Management Framework (TMF) as described in Section 8.1.3
9.5 Undertake pre-and post-dredging seagrass surveys to confirm presence/absence of seagrass within the ZoMI and ZoI.
Seagrass surveys should include use of towed video survey techniques to cover the spatial area of the ZoMI and ZoI, with confirmation diving inspections to be undertaken at locations where seagrass is detected. Final survey methods should be discussed and agreed with the TACC prior to undertaking the initial pre-dredging survey.
Proponent • Pre-dredging seagrass survey report
• Post-dredging seagrass survey report
• Pre-dredging survey at least one month prior to commencement of dredging in the HAC offshore area.
• (If seagrass detected in pre-dredge survey then undertake post-dredging survey within 1 year following completion of dredging.
• Continue post-dredging surveys on an annual basis (Maximum of five years) as required to identify evidence of seagrass recovery within the predicted ZoMI.
• Where seagrass has not shown evidence of recovery within the ZoMI after 3 years, consider options for manual planting or translocation of material to promote meadow establishment.
9.5 Visual monitoring of dredge related plumes to ensure they do not extend beyond the predicted ZoMI for more than three consecutive days.
Contractor • Completed plume sketch proforma
• Daily during dredging.
• Slow or adapt dredge operations to minimise turbidity outputs
9.6 Undertake inspection and maintenance of erosion, sediment control and drainage structures particularly following heavy or prolonged rainfall.
Contractor • Site ES&H inspection checklist • Daily • Investigate reasons for erosion or drainage damage and adopt management measures (e.g. manage tail water flow rates).
9.7 Ensure no unplanned alterations are made to existing on-site drainage infrastructure that could lead to potential water quality impacts off site.
Contractor • Site ES&H inspection checklist • For the duration of tail water discharge.
• Investigate reasons for erosion or drainage damage and adopt management measures (e.g. manage tail water flow rates).
OMSB Stage 2: DSDMP Page 38 OMSB Pty Ltd 17WAU-0008 /R1702034
9.8 Install scour protection measures such as gabions where scouring is likely to occur.
Contractor • Site ES&H inspection checklist • For the duration of dredging.
• Investigate reasons for erosion or drainage damage and adopt management measures (e.g. manage tail water flow rates).
9.9 Use suitable dredging plant and equipment to minimise turbidity, including well maintained floating pipelines to minimise leakage of turbid water during pumping of material to the DMMA.
Contractor • Pre-mobilisation equipment checklist
• Equipment maintenance schedule/documentation
• Prior to commencement of dredging.
• Dredge operations not to commence prior to document approval.
Maintain water quality to meet:
• A High Level of Ecological Protection at the tail water discharge (Weir box) and in the western tributary of Beadon Creek (BCW); and
• A High Level of Ecological Protection in the eastern tributary of Beadon Creek
9.10 Implement the Discharge Water Quality Monitoring Program (DWQMP) described in Section 8.2.
Proponent • Telemetered monitoring data
• Monthly reporting
• For the duration of DMMA tail water discharge.
• Implement TMF as described in Section 8.2.3.
OMSB Stage 2: DSDMP Page 39 OMSB Pty Ltd 17WAU-0008 /R1702034
6.2. Coastal Processes Management proposed to minimise potential impacts on the environmental factor ‘Coastal Processes’ are described in Table 10.
Table 10 Management actions to minimise impacts on Coastal Processes.
Environmental Factor Coastal Processes
Activity Dredging
Potential Impacts Dredge activities have the potential to modify coastal morphologies and hydrodynamics.
Management Targets Management Actions Environmental Performance
Item Actions Responsibility Reporting/Evidence Timing Contingency
Dredging operations do not occur outside the defined dredge footprint.
10.1 Undertake a HAZID risk assessment to identify potential impacts on hydrodynamics and coastal morphology.
Proponent • Assessment included in referral support document.
• Prior to commencement of dredging.
• Completed.
10.2 Utilise a satellite-based vessel monitoring system on the dredge to ensure no dredging occurs outside the planned area.
Contractor • Inspection of satellite-based vessel monitoring system,
• Dredge progress reports submitted to the proponent throughout dredging.
• Prior to and during dredge operations.
• Weekly throughout dredging
• Cessation of dredging and relocation of dredge; and
• Maintenance of tracking system.
10.3 Verify calibration of the hydrographic survey systems onboard the dredge.
Contractor • Provide calibration documentation.
• Prior to commencement of dredging.
• Dredging to commence only after calibration certification for survey equipment is verified.
OMSB Stage 2: DSDMP Page 40 OMSB Pty Ltd 17WAU-0008 /R1702034
6.3. Marine Environmental Quality Management proposed to minimise potential impacts on the environmental factor ‘Marine Environmental Quality’ are described in Table 11.
Table 11 Management actions to minimise impacts on Marine Environmental Quality.
Environmental Factor Marine Environmental Quality
Activity Dredging and tail water discharge
Potential Impacts Water quality (physico-chemical and contamination) in the marine environment and Beadon Creek may be adversely impacted by dredge operations and tail water discharge.
Management Targets Management Actions Environmental Performance
Item Actions Responsibility Reporting/Evidence Timing Contingency
Maintain water quality to meet:
• A High Level of Ecological Protection at the tail water discharge (Weir box) and in the western tributary of Beadon Creek (BCW); and
• A High Level of Ecological Protection in the eastern tributary of Beadon Creek
11.1 Undertake a sediment contamination investigation prior to dredge operations.
Proponent • Assessment included in referral support document.
• Prior to commencement of dredging.
• Completed
11.2 Implement the DWQMP described in Section 8.2. Proponent • Telemetered monitoring data
• Monthly reporting
• For the duration of DMMA tail water discharge.
• Implement TMF as described in Section 8.2.3.
11.3 Conduct inspections of all dredge equipment and pipelines including land based) to check for leaks or damage.
Contractor • Vessel and Site ES&H inspection checklist
• Daily throughout dredging
• Cease discharge if significant spillage or damage noted;
• Activate spill response actions (control drainage, clean up) as required; and
• Implement recommendations from incident investigations.
Manage vessel bunkering, chemical storage and spill response to ensure no adverse impacts to the marine environment.
11.4 Develop a bunkering procedural document. Contractor • Vessel management procedure
• Prior to commencement of dredging.
• Dredge operations not to commence prior to development and approval of vessel management procedures.
OMSB Stage 2: DSDMP Page 41 OMSB Pty Ltd 17WAU-0008 /R1702034
11.5 Undertake vessel maintenance and bunkering in accordance with dredging contractors approved vessel management systems.
Contractor • Vessel management procedure
• For the duration of dredging.
• Vessel management systems to be reviewed and refined (if required) in the event of an identified procedural breach or hydrocarbon spill.
11.6 Industry standard hydrocarbon management practices including implementation of SOPEP to be implemented
Contractor • Vessel management procedure
• For the duration of dredging.
• Dredge operations not to commence prior to development and approval of vessel management procedures.
11.7 All equipment shall be designed and operated to prevent spills and leaks through the provision of in-built safeguards including, but not limited to, relief valves, overflow protection, and automatic and manual shut-down systems.
Contractor • Vessel and Site ES&H inspection checklist
• Vessel management procedure
• Weekly inspection checklist.
• For the duration of dredging.
• Rectify any equipment that is damaged or missing as soon as practicable.
• Dredge operations not to commence prior to development and approval of vessel management procedures.
11.8 Hydrocarbons (including hydrocarbon wastes) shall be stored in accordance with AS1940-2004.
Contractor • Vessel and Site ES&H inspection checklist
• Vessel management procedure
• Weekly inspection checklist.
• For the duration of dredging.
• Rectify any hydrocarbons or waste that are not stored correctly as soon as practicable.
• Dredge operations not to commence prior to development and approval of vessel management procedures.
11.9 The proponent is to be notified immediately in the event of a hydrocarbon spill of any volume.
Contractor • Verbal communication
• Immediately after the event (as soon as it is safe to do so).
• Dredge operations to cease until spill investigation is complete, and or Proponent has given authority to proceed.
OMSB Stage 2: DSDMP Page 42 OMSB Pty Ltd 17WAU-0008 /R1702034
11.10 An incident report is to be submitted in the event of a hydrocarbon spill of any volume.
Contractor • Incident report • Within 24 hours of the incident.
• Dredge operations to cease until spill investigation is complete, and or Proponent has given authority to proceed.
11.12 Store and segregate chemicals as directed on labels and maintain MSDS for each chemical.
Contractor • Vessel and Site ES&H inspection checklist
• Weekly throughout dredging
• Any item not compliant during inspection will be rectified prior to follow up inspection (typically one week).
11.13 Provide and maintain spill response equipment adequate for the size of vessel and activity.
Contractor • Vessel ES&H inspection checklist
• Weekly throughout dredging
• Any item not compliant during inspection will be rectified prior to follow up inspection (typically one week).
Maintain water quality to meet industrial water supply criteria for Onslow Salt’s seawater intake
11.14 Implement the DWQMP described in Section 8.2. Proponent • Telemetered monitoring data
• Monthly reporting
• For the duration of DMMA tail water discharge.
• Implement TMF as described in Section 8.2.3.
OMSB Stage 2: DSDMP Page 43 OMSB Pty Ltd 17WAU-0008 /R1702034
6.4. Marine Fauna Management proposed to minimise potential impacts on the environmental factor ‘Marina Fauna’ are described in Table 12.
Table 12 Management actions to minimise impacts on Marine Fauna.
Environmental Factor Marine Fauna
Activity Dredge and tail water discharge
Potential Impacts Marine fauna may be disturbed, injured or killed by dredge related activities.
Management Targets Management Actions Environmental Performance
Item Actions Responsibility Reporting/Evidence Timing Contingency
No reported incidences of marine fauna injury or death as a result of turbidity impacts.
12.1 Visual monitoring of dredge related plumes to ensure they do not extend beyond the predicted ZoMI and ZoHI* for more than three consecutive days.
* Dredge Plume Visual Monitoring Proforma to be provided by Proponent.
Contractor • Plume sketch proforma • Daily during dredging.
• Slow or adapt dredge operations to minimise turbidity outputs
12.2 Implement the MWQMP described in Section 8.1. Proponent • Telemetered monitoring data (light)
• Daily MODIS imagery (Plume extent)
• MWQMP monthly reports and final report.
• Commence at least eight weeks prior to starting dredging in the HAC offshore area and continue until at least two weeks following completion of dredging.
• Implement TWQMF as described in Section 8.1.3.
12.3 Implement the DWQMP described in Section 8.2. Proponent • Telemetered monitoring data
• Monthly contaminant sampling
• Monthly reporting
• For the duration of DMMA tail water discharge.
• Implement TWQMF as described in Section 8.2.3.
No reported incidences of marine fauna injury or
12.4 Implement a soft start procedure prior to activating cutter head operations.
Contractor • Daily dredge logs. • Each occasion, prior to activating cutter head.
• Dredge operations not to commence unless a soft start procedure has been implemented.
OMSB Stage 2: DSDMP Page 44 OMSB Pty Ltd 17WAU-0008 /R1702034
death as a result of dredge operations.
12.5 All project vessels are to have at least one crew member trained as a Marine Fauna Observer (MFO) on board at all times.
Contractor • Training certificate. • Prior to commencement of dredging.
• Dredge operations not to commence unless at least one crew member is a trained MFO.
12.6 MFO logs to be complete during all dredge operations. Contractor • MFO logs. • Daily whilst dredge operations are occurring.
• Investigate why MFO logs were not complete, and ensure adequate staff and resources are in place to fulfil requirement.
12.7 Dredge operations are to cease if marine mega fauna (whale, dugong, sawfish or turtle) are observed within 100 m of the dredge vessel.
Contractor • MFO logs,
• Daily dredge logs.
• For the duration of dredging.
• Investigate why dredge operations were not ceased and apply required correction actions.
12.8 Incident report to be complete if any marine mega fauna (whale, dugong, sawfish, turtle or dolphin) remains are observed within the spoil disposal site.
Contractor • Site ES&H inspection checklist.
• As required. • Investigate fauna death and apply required corrective actions and or modifications to dredge operations.
No reported incidences of marine fauna injury or death as a result of vessel strike.
12.9 All vessels to operate at a speed under 10 knots at all times during the project.
Contractor • Vessel GPS monitoring system
• DoT harbour master regulation and monitoring.
• Continuous throughout vessel operations.
• Investigate why vessel was recorded in excess for the defined speed limit and amend vessel operations and activities as appropriate.
12.10 All project vessels are to have at least one crew member trained as a MFO on board at all times.
Contractor • Training certificate. • Prior to commencement of dredging.
• Dredge operations not to commence unless at least one crew member is a trained MFO.
Manage vessel activities to prevent the introduction of Introduced Marine Pests into and within State waters.
12.11 All relevant vessels should comply with Commonwealth Department of Agriculture and Water Resources – Australian Ballast Water Management Requirements, the National Biofouling Management Guidelines for commercial vessels.
Contractor • Vessel management procedures.
• Prior to dredge entering Australian Waters or moving from one Australian port to the Port of Ashburton.
• Vessel are not to mobilise to Onslow without approved IMP documentation.
OMSB Stage 2: DSDMP Page 45 OMSB Pty Ltd 17WAU-0008 /R1702034
12.11 All vessels that mobilise to the Port of Onslow to undertake / support dredging are required to complete the WA DoF’s ‘Vessel Check’ risk assessment (https://vesselcheck.fish.wa.gov.au)
Contractor • A copy of the Vessel Check report is to be submitted to PPA for assessment along with any supporting documentation including antifoul certificates and inspection reports.
• Prior to dredge entering Australian Waters or moving from one Australian port to the Port of Ashburton.
• Vessel are not to mobilise to Onslow without approved IMP documentation.
OMSB Stage 2: DSDMP Page 46 OMSB Pty Ltd 17WAU-0008 /R1702034
6.5. Flora and Vegetation Management proposed to minimise potential impacts on the environmental factor ‘Flora and Vegetation’ are described in Table 13.
Table 13 Management actions to minimise impacts on Flora and Vegetation
Environmental Factor Flora and Vegetation
Activity Construction of spoil disposal site and pipe corridor.
Potential Impacts There is potential to impact natural flora and vegetation when constructing the spoil disposal site and dredge pipe corridor.
Management Targets Management Actions Environmental Performance
Item Actions Responsibility Reporting/Evidence Timing Contingency
No unauthorised vegetation clearing.
13.1 Demarcate approved clearing area prior to commencing any construction works.
Contractor • Site ES&H checklist
• Photographic record
• Prior to clearing activities.
• Flora and vegetation clearing not to commence prior to clear demarcation of approved clearing area.
13.2 Undertake inspection to ensure no flora or vegetation outside the approved permit is cleared or damaged.
Contractor • Site ES&H checklist • Throughout construction
• Flora and vegetation clearing not to commence prior to clear demarcation of approved clearing area.
• Report damage or clearing of any flora or vegetation outside the approved area to the Proponent.
• Proponent to report any unapproved clearing to DWER.
13.3 Develop and maintain a weed register
Contractor • Weed register • Prior to clearing.
• N/A
Minimise the potential for translocation of weeds
13.4 Undertake weed inspections Contractor • Site ES&H checklist • Prior to clearing and monthly during construction
• Implement appropriate weed control measures as required.
13.5 Include identification of environmental weeds on site induction process.
Contractor • Staff and Contractor inductions
• As required. • Update inductions as required.
OMSB Stage 2: DSDMP Page 47 OMSB Pty Ltd 17WAU-0008 /R1702034
No impact on conservation significant flora species
13.6 Clear demarcation of the known location of the Priority 3 species Stackhousia clementii, with an appropriate buffer and signage along the Samphire Shrubland – Beach vegetation type in which the species is present.
Location and photo of individual plant in the Project area is provided in Figure 13.
Contractor • Site ES&H checklist
• Photographic record
• Prior to clearing activities.
• Flora and vegetation clearing not to commence prior to clear demarcation of approved clearing area.
13.7 Include information of conservation significant flora species and habitat in the site induction process.
Contractor • Staff and Contractor inductions
• As required. • Update inductions as required.
Figure 13 Location of the Priority 3 Species, Stackhousia clementii, located adjacent to the pipeline route corridor
P3 Location
Latitude: 21.654105
Longitude: 115.121764
OMSB Stage 2: DSDMP Page 48 OMSB Pty Ltd 17WAU-0008 /R1702034
6.6. Terrestrial Environmental Quality Management proposed to minimise potential impacts on the environmental factor ‘Terrestrial Environmental Quality’ are described in Table 14.
Table 14 Management actions to minimise impacts on Terrestrial Environmental Quality.
Environmental Factor Terrestrial Environmental Quality
Activity Disposal of dredge sediments, and disturbance of existing land based soils.
Potential Impacts Potential transportation and accumulation of contaminants in dredge spoil which may impact terrestrial environmental quality.
Disposal of ASS from dredge sediments, and disturbance of existing ASS at the disposal site.
Management Targets Management Actions Environmental Performance
Item Actions Responsibility Reporting/Evidence Timing Contingency
Assess and manage marine sediment ASS to maintain the quality of land and soil.
14.1 Undertake a sediment investigation to investigate Potential Acid Sulfate Soils (PASS) in dredge sediment.
Proponent • Assessment included in referral support document.
• Completed • Completed - N/A
14.2 Prepare an Acid Sulfate Soil Management Plan (ASSMP). Contractor • ASSMP
• Prior to construction works.
• Dredge operations not to commence prior to an approved ASSMP.
• ASSMP to be reviewed and approved by relevant DMA.
14.3 Implement the DWQMP described in Section 8.2. Proponent • Telemetered monitoring data
• Monthly reporting
• For the duration of DMMA tail water discharge.
• Implement TWQMF as described in Section 8.2.3.
Assess and manage land based ASS to maintain the quality of land and soil.
14.4 Undertake a soil investigation to investigate PASS at the DMMA.
Contractor • ASSMP
• Prior to disturbance for construction of DMMA
• Land based earth works not to commence prior to client approval of HAZID.
14.5 Prepare an Acid Sulfate Soil Management Plan (ASSMP). Contractor • ASSMP
• Prior to construction works.
• Land based earth works not to commence prior to an approved ASSMP.
OMSB Stage 2: DSDMP Page 49 OMSB Pty Ltd 17WAU-0008 /R1702034
6.7. Terrestrial Fauna Management proposed to minimise potential impacts on the environmental factor ‘Terrestrial Fauna’ are described in Table 15.
Table 15 Management actions to minimise impacts on Terrestrial Fauna.
Environmental Factor Terrestrial Fauna
Activity Flora and vegetation clearing and construction activities
Potential Impacts Fauna habitats may be damaged or removed as a result of vegetation clearing.
Construction equipment used outside site boundary may impact fauna.
Management Targets Management Actions Environmental Performance
Item Actions Responsibility Reporting/Evidence Timing Contingency
No unauthorised vegetation clearing.
15.1 Demarcate approved clearing area prior to commencing any construction works.
Contractor • Site ES&H checklist
• Photographic record
• Prior to clearing activities.
• Flora and vegetation clearing not to commence prior to clear demarcation of approved clearing area.
15.2 Undertake a pre-clearance fauna/spotter catcher survey. Proponent • Pre-clearance fauna/spotter catcher survey.
• Prior to clearing activities.
• Flora and vegetation clearing not to commence prior to a pre-clearance fauna/spotter catcher survey.
15.3 All vehicles and plant are to remain within the defined site boundaries.
Contractor and Proponent
• Appropriate boundary signage and barriers,
• Site ES&H inspection checklist
• Throughout construction
• Site boundaries are to be clear and visible, and rectified if required.
Manage dredge and construction operations to minimise disturbance of migratory bird foraging and feeding habitats.
15.4 Utilise a satellite-based vessel monitoring system on the dredge to ensure no dredging occurs outside the planned area.
Contractor • Inspection of satellite-based vessel monitoring system.
• Dredge progress reports submitted to the proponent.
• Prior to and during dredge operations.
• Weekly throughout dredging
• Cessation of dredging and relocation of dredge; and
• Maintenance of tracking system.
OMSB Stage 2: DSDMP Page 50 OMSB Pty Ltd 17WAU-0008 /R1702034
15.5 All vehicles and plant are to remain within the defined site boundaries.
Contractor and Proponent
• Appropriate boundary signage and barriers,
• Site ES&H inspection checklist
• Throughout construction
• Site boundaries are to be clear and visible, and rectified if required.
15.6 Project lighting spill will be minimised where practicable. (lighting direction, duration and level).
Contractor • Site ES&H inspection checklist.
• Throughout construction
• Investigate alternative ways in which lighting spill can be minimised on site.
Manage site conditions to minimise the potential for migratory birds to gather in the spoil disposal site.
15.7 Monitor the level of bird aggregation in spoil disposal site. Contractor • Site ES&H inspection checklist.
• Daily throughout construction
• Implement Item 12.8 as required.
15.8 If required, deterrents such as bunting, tape, sirens, scare guns, mock hawks, or bio-acoustics (natural predator and distress calls) can be used to deter birds from aggregating in spoil disposal site.
Contractor • Visual or audio deterrent equipment,
• Site ES&H inspection checklist.
• Throughout construction
• Investigate alternative ways in which bird life could be deterred from aggregating on spoil disposal site.
OMSB Stage 2: DSDMP Page 51 OMSB Pty Ltd 17WAU-0008 /R1702034
6.8. Hydrological Processes Management proposed to minimise potential impacts on the environmental factor ‘Hydrological Processes’ are described in Table 16.
Table 16 Management actions to minimise impacts on Hydrological Processes.
Environmental Factor Hydrological Processes
Activity Land based construction activities
Potential Impacts Surface water drainage patterns (excluding the spoil disposal area) may be altered by construction activities.
Management Targets Management Actions Environmental Performance
Item Actions Responsibility Reporting/Evidence Timing Contingency
Manage construction works and water discharge to maintain surface runoff patterns.
16.1 Tail water discharge activities are not to significantly disrupt natural drainage patterns (excluding the proposed spoil disposal area).
Contractor • Site ES&H inspection checklist.
• Throughout construction
• If significant changes to surface runoff patterns are observed, an investigation is to be undertaken to identify possible corrective actions (e.g. modify tail water discharge rates).
16.2 Install a control valve where tail water is to be released, so that flow rates can be modified.
Contractor • Site ES&H inspection checklist.
• Prior to tail water discharge
• Tail water is not to be discharged prior to installation of a control valve in the DMMA.
16.3 Construction activities and earth works are not to significantly disrupt natural drainage patterns (excluding the proposed spoil disposal area).
Contractor • Site ES&H inspection checklist.
• Throughout construction
• Corrective actions to restore natural drainage patters will be implemented in the event of unplanned disturbance.
OMSB Stage 2: DSDMP Page 52 OMSB Pty Ltd 17WAU-0008 /R1702034
6.9. Air Quality Management proposed to minimise potential impacts on the environmental factor ‘Air Quality’ are described in Table 17.
Table 17 Management actions to minimise impacts on Air Quality.
Environmental Factor Air Quality
Activity Construction activities
Potential Impacts Construction works have the potential to create dust, impacting the town of Onslow.
Management Targets Management Actions Environmental Performance
Item Actions Responsibility Reporting/Evidence Timing Contingency
Manage construction works to minimise impact on air quality.
17.1 Dust suppression will be implemented to reduce impacts of general construction works (e.g. water trucks).
Contractor • Site ES&H inspection checklist.
• Daily throughout construction.
• Additional suppression efforts or methods are to be implemented if dust levels are reported to be impacting the town of Onslow or Onslow Airport.
17.2 Appropriate dust suppression (e.g. seeded hydromulch or topsoil) will be implemented within the spoil disposal area once tail water has drained away.
Contractor • Site ES&H inspection checklist
• Daily once tail water has drained away.
• If dust levels persist after initial suppression efforts, alternative method for suppression will be investigated
OMSB Stage 2: DSDMP Page 53 OMSB Pty Ltd 17WAU-0008 /R1702034
6.10. Social Surrounds Management proposed to minimise potential impacts on the environmental factor ‘Social Surrounds’ (Aboriginal Heritage) are described in Table 18.
Table 18 Management actions to minimise impacts on Social Surrounds.
Environmental Factor Social Surrounds
Activity Construction works.
Potential Impacts Potential disturbance of a significant Aboriginal Heritage site.
Management Targets Management Actions Environmental Performance
Item Actions Responsibility Reporting/Evidence Timing Contingency
Site boundaries and construction works will be managed to protect social surroundings from significant harm.
18.1 Undertake pre-clearance ethnographic and archaeological surveys for any areas of the disposal site and pipeline route that have not previously been surveyed.
Where required surveys will be undertaken in consultation with the traditional owners.
Proponent • Ethnographic and archaeological survey reports.
• Prior to commencement of dredging and construction works.
• Dredge operations and land based construction works are not to commence prior to Ethnographic and archaeological surveys (if required).
18.2 If survey results determine it is required, prepare and submit a Section 18 referral to the Department of Aboriginal Affairs (DAA).
Proponent • Section 18 referral. • Prior to commencement of dredging and construction works.
• Dredge operations and land based construction works are not to commence prior to the submission of a Section 18 referral to the DAA (if required).
18.3 Liaise with traditional owners and community groups and implement appropriate cultural protocols prior to dredging commencement, to ensure that proper respect is shown to the Warnamankura (mythological water serpent).
Contractor
Proponent
• Stakeholder consultation with traditional owners and local communities.
• Prior to commencement of dredging and construction works.
• Dredge operations and land based construction works are not to commence prior to discussion with traditional owners and local communities.
18.4 Heritage Monitors onsite during clearing and/or land-based ground disturbance works.
Contractor • Daily monitor logs. • During clearing or ground disturbance works (excludes dredging)
• Reporting of any incidents to DAA.
OMSB Stage 2: DSDMP Page 54 OMSB Pty Ltd 17WAU-0008 /R1702034
7. Waste Management
The waste management measures identified in Table 19 (applicable to vessels and land based) are aimed at minimising impacts on the marine and terrestrial environment arising from waste discharge and disposal. Daily Vessel and Site ES&H inspections will be undertaken to check that all reasonable and practicable measures are being taken to minimise the generation of waste and its discharge into the environment.
Table 19 Waste management objectives and measures.
Objective Management Measure
Ensure staff, contractors, and subcontractors are aware of responsibilities to appropriately manage waste, including achieving recycling targets.
All personnel are to be appropriately inducted prior to any site works. Waste management plans/procedures to be made available to all personnel.
Appropriately segregate waste. Recycle waste where possible.
Store waste with minimum impact on the environment. Provide sufficient recycling and waste bins on site including offices, crib rooms and vessels.
Store waste in enclosed bins with no exposure to the elements.
Store waste in accordance with Australian Standards, Codes of Practice and relevant legislation.
Avoid large stockpiles of materials on site.
Avoid overloading bins.
Avoid storing waste on site for long periods of time.
Disposal of waste with minimum impacts on the environment. Use appropriate & licensed contractors for waste disposal.
Dispose of waste regularly.
OMSB Stage 2: DSDMP Page 55 OMSB Pty Ltd 17WAU-0008 /R1702034
8. Monitoring
8.1. Marine Water Quality Monitoring Program
8.1.1. Monitoring Rationale
The MWQMP should be implemented prior to, during and post dredging of the HAC offshore areas to ensure that the EPOs and MTs for subtidal BCH in this area are achieved. The monitoring approach is based on:
• Real-time telemetered monitoring of light conditions at the seabed within the ZoMI and at the boundary of the ZoI/ZoMI and at nominated reference locations; and
• Twice daily assessment of dredge plume extent based on the MODIS imagery acquisition and analysis of total suspended sediment (TSS) concentration at the surface.
8.1.2. Environmental Protection Outcomes, Management Targets and Trigger Levels
The EPOs, MTs and trigger levels to be applied for protection of subtidal BCH during dredging of the HAC offshore areas (i.e. beyond the training wall) are presented in Table 20.
Trigger levels to achieve the EPOs and MTs were developed in consideration of the latest available information from the WAMSI Dredging Science Node for the protection of seagrass (Halophila sp.) BCH (WAMSI 2017). It is noted that seagrass BCH monitoring is not proposed during dredging5. However, the trigger levels provided in Table 20 involve in-situ measurement of daily light intensity, which has been determined by WAMSI (2017) to provide an appropriate proxy measurement for seagrass health.
Plume extent (i.e. MODIS imagery analysis) should also be used to inform dredge management, however no specific trigger levels are proposed.
5 Table 9, Management action 9.5 requires pre- and post-dredging seagrass surveys to be undertaken to confirm presence/absence of seagrass and subsequently assess the effectiveness of the during-dredging daily light intensity trigger levels in protecting BCH to achieve the EPOs and MTs.
OMSB Stage 2: DSDMP Page 56 OMSB Pty Ltd 17WAU-0008 /R1702034
Table 20 Environmental Protection Outcomes, Management Targets and Trigger Levels for protection of BCH from dredging related impacts
Monitoring Locations
ZoMI (East/West) ZoI/ZoMI Boundary (East/West)
Monitoring sites located on ZoI/ZoMI best-case predicted impact boundary
Monitoring sites located on ZoI/ZoMI worst-case predicted impact boundary
Management Target
No Ecological Impact on Seagrass BCH
Trigger Level 1 Early Warning for no ecological impact on seagrass BCH
Trigger Level 2
For any period of 5 or more consecutive days:
- Mean daily light intensity should not be <0.9 mol/m2/day; AND
- Median daily light intensity of an impact site should not be <20th percentile of reference sites.
For any period of 3 or more consecutive days:
- Mean daily light intensity should not be <0.9 mol/m2/day; AND
- Median daily light intensity of an impact site should not be <20th percentile of reference sites.
OR
For any 2-week (14-day) period:
- Mean daily light intensity (calculated as a rolling 2-week average) should be >0.9 mol/m2/day; AND
- Median daily light intensity of an impact site (calculated as rolling 2-week median) should be >20th percentile of reference sites.
Environmental Protection Outcome
Recoverable Impact on Seagrass BCH
Trigger Level 2 No Ecological Impact on Seagrass BCH
Trigger Level 3
For any period of 10 or more consecutive days:
- Mean daily light intensity should not be <0.9 mol/m2/day; AND
- Median daily light intensity of an impact site should not be <20th percentile of reference sites.
For any period of 5 or more consecutive days:
- Mean daily light intensity should not be <0.9 mol/m2/day; AND
- Median daily light intensity of an impact site should not be <20th percentile of reference sites.
OR OR
For any 2-week (14-day) period:
- Mean daily light intensity (calculated as a rolling 2-week average) should be >0.9 mol/m2/day; AND
- Median daily light intensity of an impact site (calculated as rolling 2-week median) should be >5th percentile of reference sites.
For any 2-week (14-day) period:
- Mean daily light intensity (calculated as a rolling 2-week average) should be >0.9 mol/m2/day; AND
- Median daily light intensity of an impact site (calculated as rolling 2-week median) should be >20th percentile of reference sites.
8.1.3. Tiered Management Framework
A MWQMP Tiered Management Framework (TMF) has been developed based on monitoring and reporting against the three trigger levels presented in Table 20 to ensure EPOs and MTs for protection of seagrass BCH are achieved during dredging of the HAC offshore area. The TMF presented in Figure 14 will be implemented by the Proponent/Contractor.
OMSB Stage 2: DSDMP Page 57 OMSB Pty Ltd 17WAU-0008 /R1702034
Figure 14 Marine Water Quality Monitoring Program - Tiered Management Framework
OMSB Stage 2: DSDMP Page 58 OMSB Pty Ltd 17WAU-0008 /R1702034
8.1.4. Monitoring Locations & Frequency
The four indicative MWQMP monitoring locations described in Table 21 and presented in Figure 15 (Winter), Figure 16 (Transitional) and Figure 17 (Summer) are proposed to be monitored real-time during dredging of the HAC offshore areas. Monitoring locations are indicative only and are based on the predicted extent of ZoI/ZoMI zones. However, final monitoring locations will be selected based, ideally on where seagrass BCH is observed during the required pre-dredging BCH survey (Refer to Table 9; Management Item 9.5) in close proximity of the indicative monitoring locations (i.e. within 100m of the impact zone boundaries).
Monitoring should commence at least eight weeks prior to starting dredging in the HAC offshore area and continue until at least two weeks following completion of dredging.
Table 21 Indicative MWQMP Monitoring Locations
Site Name Location EPO MT Latitude Longitude
ZoI/ZoMI Boundary - East Impact No Ecological Impact Early Warning TBA – Dependent on season in which dredging is conducted and whether seagrass BCH is detected
during pre-dredging surveys. Indicative monitoring locations are
shown on Figure 15 (Winter), Figure 16 (Transitional) and Figure
17 (Summer).
ZoMI - East Impact Recoverable Impact No Ecological Impact
Ref - East Reference N/A N/A
ZoI/ZoMI Boundary - West Impact No Ecological Impact Early Warning
ZoMI - West Impact Recoverable Impact No Ecological Impact
Ref - West Reference N/A N/A
8.1.5. Parameters and Procedures
Light Intensity
Light quantity and quality6 will be measured every 30 minutes at each of the monitoring locations presented in Table 21. At all locations, light data will be collected using in situ water quality loggers with telemetry capability. Logging systems will be located approximately 0.5 m above the seabed on a steel frame at each specified monitoring location.
Data will be downloaded daily using the telemetry system deployed with the logger. Loggers will be calibrated monthly to ensure accurate datasets are acquired.
Plume Extent (TSS)
Total suspended solids will be measured twice daily via MODIS imagery acquisition and analysis to define plume extent and inform the spatial extent of any exceedance of the light thresholds that are reported at the in-situ impact monitoring locations.
Assessment of TSS plume extent in relation to the designated light thresholds will be based on the pre-existing relationship established for inshore Pilbara waters and presented in Strydom et al. (2017).
Replicate surface water samples should be collected at each monitoring location on a monthly basis during WQMS maintenance to allow for calibration with MODIS imagery analysis.
6 Although light quality information is not required for assessment against EPOs and MTs, light quality measured during dredging provides valuable information for the WAMSI Dredging Science Node to improve the science and understanding of potential impacts to seagrass BCH as a result of decreased light quality during dredging.
OMSB Stage 2: DSDMP Page 59 OMSB Pty Ltd 17WAU-0008 /R1702034
Figure 15 Indicative MWQMP Monitoring Locations - Winter
OMSB Stage 2: DSDMP Page 60 OMSB Pty Ltd 17WAU-0008 /R1702034
Figure 16 Indicative MWQMP Monitoring Locations - Transitional
OMSB Stage 2: DSDMP Page 61 OMSB Pty Ltd 17WAU-0008 /R1702034
Figure 17 Indicative MWQMP Monitoring Locations - Summer
OMSB Stage 2: DSDMP Page 62 OMSB Pty Ltd 17WAU-0008 /R1702034
8.1.6. Data analysis
Water quality (light) will be collected continuously (i.e. at least every 30 minutes) throughout monitoring period and will be used to provide early warning of potential water quality deterioration at each of the monitoring sites. The likelihood of a link between dredging and water quality decline will be assessed in terms of the following factors:
• Correct instrument function and operation;
• Locations of and status of dredging activities in relation to the site(s) at the time of the exceedance;
• Hydrodynamic conditions, for example wind, tide, wave and swell state at the time of the exceedance;
• Effects of an extreme weather event in the region; and
• Spatial extent of water quality decline at the time of exceedance based on review of daily plume extent (i.e. MODIS imagery analysis).
8.2. Discharge Water Quality Monitoring Program
8.2.1. Monitoring Rationale
The DWQMP should be implemented prior to, during and post tail water discharge from the DMMA to ensure that the EPOs and MTs for protection of marine environmental quality and intertidal BCH in Beadon Creek are achieved and potential acidification in the DMMA is managed. The monitoring approach is based on:
• Real-time telemetered monitoring of water quality (Turbidity, pH, Salinity, Temperature and Dissolved Oxygen) at:
o One location within the DMMA, prior to discharge (DSC); o One location within the receiving environment, downstream from the discharge location (i.e.
Beadon Creek East - BCW); and o One reference location within Beadon Creek, away from the influence of dredging and
dewatering activities (i.e. Beadon Creek West - BCE). • Weekly sample collection for analysis of Total Titratable Acidity (TTA) within the DMMA prior to
discharge; and
• Monthly water quality sampling for dissolved metals and Tributyltin (TBT) at the DMMA tail water discharge point (DSC)7.
EPOs, MTs and associated trigger levels were developed assuming the potential for a temporary, localised reduction in marine environmental quality in the immediate vicinity of the tail water discharge. Trigger levels were also developed for management of potential acidification in the DMMA.
8.2.2. Environmental Protection Outcomes, Management Targets and Trigger Levels
The EPOs, MTs and trigger levels to be applied for protection of marine environmental quality, intertidal BCH and management of acidification during tail water discharge from the DMMA are presented in Table 22.
8.2.3. Tiered Management Framework
A DWQMP TMF has been developed based on monitoring and reporting against the three trigger levels presented in Table 22 to ensure EPOs and MTs for protection of marine environmental quality and intertidal BCH are achieved during tail water discharge operations from the DMMA to Beadon Creek. The TMF presented in Figure 18 will be implemented by the Proponent/Contractor.
7 Where exceedance is reported at DSC, then monitoring should also commence at other monitoring locations (i.e. BCW and BCE).
OMSB Stage 2: DSDMP Page 63 OMSB Pty Ltd 17WAU-0008 /R1702034
Table 22 Environmental Protection Outcomes, Management Targets and Trigger Levels for protection of marine environmental quality and intertidal BCH from potential tail water discharge impacts
Monitoring Locations
DMMA Discharge (DSC) Beadon Creek West (BCW)
Located in at the tail water discharge location prior within the DMMA
Located in the Western Tributary of Beadon Creek
Management Target
High Level of Ecological Protection
Trigger Level 1 High Level of Ecological Protection#
Trigger Level 2
Physico-chemical*
Turbidity: Median <80th percentile of reference
Temperature: Median >20th percentile and <80th percentile of reference
Salinity: Median >20th percentile and <80th percentile of reference
pH: Median >20th percentile and <80th percentile of reference
Dissolved Oxygen = >60% Saturation
Physico-chemical*
Turbidity: Median <80th percentile of reference
Temperature: Median >20th percentile and <80th percentile of reference
Salinity: Median >20th percentile and <80th percentile of reference
pH: Median >20th percentile and <80th percentile of reference
Dissolved Oxygen = >70% Saturation
Contaminants
Dissolved metals: 99% Species Protection Levels (SPL)
TBT: 99% SPL
Acidification
pH: >6.5
Environmental Protection Outcome
Moderate Level of Ecological Protection
Trigger Level 2 Moderate Level of Ecological Protection^
Trigger Level 3
Physico-chemical*
Turbidity: Median <95th percentile of reference
Temperature: Median >5th percentile and <95th percentile of reference
Salinity: Median >5th percentile and <95th percentile of reference
pH: Median >5th percentile and <95th percentile of reference
Dissolved Oxygen = >60% Saturation
Physico-chemical*
Turbidity: Median <95th percentile of reference
Temperature: Median >5th percentile and <95th percentile of reference
Salinity: Median >5th percentile and <95th percentile of reference
pH: Median >5th percentile and <95th percentile of reference
Dissolved Oxygen = >60% Saturation
Contaminants
Dissolved metals: 95% SPL
TBT: 95% SPL
Acidification
pH = >6
TTA = <40 mg/L
* Medians calculated based on a rolling 14-day period. # The Management Target for maintenance of industrial water supply (Table 11;Item 11.4) is considered to be met within a High Level of Ecological Protection. ^ The EPO for a Moderate Level of Ecological Protection at BCW only applies during discharge. The location should return to a High Level of Ecological Protection within one month following cessation of discharge.
OMSB Stage 2: DSDMP Page 64 OMSB Pty Ltd 17WAU-0008 /R1702034
Figure 18 Discharge Water Quality Monitoring Program - Tiered Management Framework
OMSB Stage 2: DSDMP Page 65 OMSB Pty Ltd 17WAU-0008 /R1702034
8.2.4. Monitoring Locations & Frequency
The three indicative DWQMP monitoring locations described in Table 23 and presented in Figure 19 are proposed to be monitored real-time during tail water discharge operations. Monitoring locations presented in Figure 19 are indicative only and will be subject to safe navigation within Beadon Creek and final discharge location in the DMMA.
Table 23 Indicative DWQMP Monitoring Locations
Site Name Location EPO MT Latitude Longitude
Discharge (DSC) Impact Moderate Level of Ecological Protection
High Level of Ecological Protection
21°39'44.15"S 115° 7'7.22"E
Beadon Creek West (BCW)
Impact Moderate Level of Ecological Protection
High Level of Ecological Protection
21°39'9.20"S 115° 7'40.16"E
Beadon Creek East (BCE)
Reference N/A N/A 21°39'17.47"S 115° 8'10.71"E
Commence discharge water quality monitoring in the receiving environment locations (i.e. BCE & BCW) one month prior to commencement of tail water discharge from the DMMA and continue until at least one month following completion of tail water discharge from the DMMA.
Commence acidification monitoring and surface water sampling for laboratory analysis of TTA, dissolved metals and TBT in the DMMA as soon as sufficient water level is achieved to facilitate monitoring and continue until tail water discharge from the DMMA is completed.
OMSB Stage 2: DSDMP Page 66 OMSB Pty Ltd 17WAU-0008 /R1702034
Figure 19 Indicative DWQMP Monitoring Locations
DMMA
Tail Water Discharge Options
BCW
DSC
BCE (Ref)
N
OMSB Stage 2: DSDMP Page 67 OMSB Pty Ltd 17WAU-0008 /R1702034
8.2.5. Parameters and Procedures
Physico-chemical parameters
Turbidity, temperature, salinity, pH and dissolved oxygen will be measured every 30 minutes at each of the monitoring locations presented in Table 23. At all locations, water quality data will be collected using in situ water quality loggers with telemetry capability (Water Quality Monitoring Systems - WQMS). In Beadon Creek, each WQMS will be located approximately 0.5 m above the seabed on a steel frame at each specified monitoring location. At the tail water discharge location, the WQMS will be installed to measure water quality immediately prior to (i.e. within 50m) discharge via the weir box.
Data will be downloaded daily using the telemetry system deployed with the logger. Loggers will be calibrated monthly to ensure accurate datasets are acquired.
Dissolved Metals & TBT
Surface water samples will be collected monthly at the tail water discharge monitoring location for laboratory analysis of dissolved metals (As, Cd, Cr, Cu, Pb, Hg, Ni, Se, Zn) and TBT.
Acidification
As part of the physico-chemical monitoring described above, pH will be measured every 30 minutes in the DMMA prior to discharge (i.e. DSC). Water quality data will be collected using in situ water quality loggers with telemetry capability (Water Quality Monitoring Systems - WQMS). At the tail water discharge location, the WQMS will be installed to measure water quality immediately prior to (i.e. within 50m) discharge via the weir box.
Data will be downloaded daily using the telemetry system deployed with the logger. Loggers will be calibrated monthly to ensure accurate datasets are acquired.
Surface water samples will be collected on a weekly basis at the tail water discharge monitoring location for laboratory analysis of Total Titratable Acidity (TTA).
8.2.6. Data analysis
Physico-chemical water quality parameters will be measured continuously throughout monitoring period and will be used to provide early warning of potential water quality deterioration at each of the monitoring sites. The likelihood of a link between tail water discharge and water quality decline in Beadon Creek will be assessed in terms of the following factors:
• Correct instrument function and operation;
• Status of discharging and dredging activities at the time of, and leading up to the exceedance;
• Water quality conditions at the tail water discharge point;
• Hydrodynamic conditions in Beadon Creek, for example wind and tide at the time of the exceedance; and
• Effects of an extreme weather event in the region.
OMSB Stage 2: DSDMP Page 68 OMSB Pty Ltd 17WAU-0008 /R1702034
9. Reporting
A summary of the environmental reporting requirements identified within this DSDMP is provided in Table 24.
Table 24 Reporting requirements during dredging and dredge disposal.
Name of Report Content Timeframe Recipient
Plume Sketches Illustration and observation of dredge plume extent. Daily whilst dredge operating. Proponent
Benthic Habitat Pre-dredging Survey Report
Results and discussion of pre-dredge benthic habitat survey. Recommendations for suitable MWQMP monitoring locations.
Prior to commencement of dredging.
Proponent
Benthic Habitat Post-dredging Survey Report
Results and discussion of post-dredge benthic habitat survey. Describe whether or not BCH is present within the predicted ZoMI.
Prior to commencement of dredging.
Proponent
Marine Water Quality Monitoring Report
Monthly summary of light data and MODIS imagery analysis to provide a status of water quality health relative to the EPOs and MTs.
Monthly.
Final report following cessation of dredging the HAC offshore areas.
DoT
SoA
TACC
Discharge Water Quality Monitoring Report
Monthly summary of water quality monitoring data to provide a status of water quality health relative to the EPOs and MTs.
Monthly.
Final report following cessation of tail water discharge.
DoT
SoA
TACC
IMP Risk Assessment Department of Fisheries ‘Vessel check risk assessment’, copy of Vessel Check report, supporting documentation including antifoul certificates and inspection reports.
Statement from lead inspector on marine pest status of the vessel.
Within 72 hours of inspection. DoT
DoF
Vessel Quarantine Report
Checklist of vessel components checked during vessel inspection.
Statement from lead inspector.
Within 14 days of inspection or risk assessment.
DoT
DoF
Incident Report The contractor shall notify the Proponent as soon as possible following an incident.
The Contractor will submit an incident report to the Proponent within 24hrs of the event.
As per the OMSB Incident Management Procedure.
Proponent
Environmental Performance Report
Summary of environmental compliance with the requirements of this DSDMP.
Overview of any environmental incidents (e.g. breach of EPOs or MTs) and management action taken, including the results of any follow-up investigations.
At each TACC meeting. ~TACC Meetings are planned to occur during April and October each year.
DoT
SoA
TACC
9.1. Daily Inspections/Checklists Below is a list of required daily environmental inspection/checklists that are to be submitted to verify ES&H compliance. Note the list below is the minimum requirement, the contractor may wish to undertake addition inspections/checklists to demonstrate compliance.
• Site ES&H inspection – (e.g. dredge pipe integrity, erosion, bund integrity, dust, drainage, site boundaries, waste management).
• Vessel ES&H inspection – (e.g. equipment inspection, navigation equipment systems, speed, MFO personnel, waste management, chemical storage, spill kits).
OMSB Stage 2: DSDMP Page 69 OMSB Pty Ltd 17WAU-0008 /R1702034
• Dredge operation log – (e.g. operations times, types of operations, soft start times, gps positioning, dredge volumes).
• MFO Logs – (e.g. dredge operation time, MFO name, fauna species, distance from vessel, management response).
OMSB Stage 2: DSDMP Page 70 OMSB Pty Ltd 17WAU-0008 /R1702034
10. Review
This DSDMP should be reviewed on an as required basis. It is considered that review and revision should at least occur in response to the following circumstances:
• To address any conditions imposed by relevant decision-making authorities (i.e. EPA, DoT, SoA);
• New information relating to potential environmental impacts comes to hand;
• Finalisation of Dredge Spoil Disposal Strategy; and
• Significant changes to dredging or spoil disposal methodology.
Upon review of the DSDMP, the document will be revised where appropriate and the revision status of the document will be updated as required.
OMSB Stage 2: DSDMP Page 71 OMSB Pty Ltd 17WAU-0008 /R1702034
11. References
BMT Oceanica (2015) Technical Memorandum: Pre-referral meeting for proposed Onslow Marine Support Base. Memorandum issued to the Office of the Environmental Protection Authority on 12th November 2015.
Bray, R.N., Bates, A.D., & Land, J.M. (1997) Dredging: A handbook for Engineers, Second Edition.
EPA (2014) Beadon Creek Capital Dredging and Construction of Land-Backed Wharf. Not Assessed – Public Advice Given. 28 April 2014.
Environmental Protection Authority (EPA) (2016) Statement of Environmental Principles, Factors and Objectives. Environmental Protection Authority. December 2016.
Galt Geotechnics (2017) Technical Memorandum: Geotechnical Assessment of Imported Fill, Proposed Boat Harbour Access Road Upgrade Beadon Creek Road, Onslow.
PIANC (2014) Classification of Soils and Rocks for the Maritime Dredging Process. Report No 144
Strydom, S., McMahon, k., & Lavery, P. (2017) Response of the seagrass Halophila ovalis to altered light quality in a simulated dredge plume. Marine Pollution Bulletin 121 (2017) 233-330
USACE (2015) Dredging and Material Management (EM-1110-2-5025)
Van ‘t Hoff, J. (2013) Hydraulic Fill Manual: For Dredging and Reclamation Works. CRC Press
WAMSI (2017) Theme 5: Seagrasses: Defining Thresholds and Indicators of Primary Producer Response to Dredging Related Pressures – A Synopsis. DRAFT – Unpublished Report supplied by DWER.
OMSB Stage 2: DSDMP Page 72 OMSB Pty Ltd 17WAU-0008 /R1702034
Appendix A Port of Ashburton Technical Advisory and Consultative Committee – Terms of Reference
Port of Ashburton - Technical Advisory and Consultative Committee Terms of Reference – Dredging and Dredged Material Disposal A244832
TACC TERMS OF REFERENCE PORT OF ASHBURTON
A463863 Page 2 of 9
TABLE OF CONTENTS 1. CONTEXT .................................................................................................................... 3
2. SCOPE ........................................................................................................................ 3
3. TACC MEMBERSHIP .................................................................................................. 4
4. MEETINGS .................................................................................................................. 5
5. QUORUM ..................................................................................................................... 5
6. AGENDA ...................................................................................................................... 6
7. MINUTES ..................................................................................................................... 6
8. OUT OF SESSION ITEMS ........................................................................................... 6
9. REVIEW OF TERMS OF REFERENCE ....................................................................... 6
10. VERSION CONTROL ................................................................................................... 6
11. SCHEDULE 1 ............................................................................................................... 8
12. SCHEDULE 2 ............................................................................................................... 9
TACC TERMS OF REFERENCE PORT OF ASHBURTON
A463863 Page 3 of 9
1. CONTEXT
On 2 December 2016, the Department of the Environment and Energy issued Pilbara Ports Authority (PPA) with a Sea Dumping Permit (SD2016/3282), which commences on 23 March 2017 for a period of five years.
PPA’s Permit allows for the dumping of dredged material derived from maintenance dredging of the shipping channel, turning basins, product loading facility and Materials Off-loading Facility within the Port of Ashburton to approved spoil grounds.
Ongoing stakeholder input is important in the execution of any successful dredging program. PPA is committed to the implementation of effective, transparent and timely engagement and communication with stakeholders interested in or affected by dredging programs within its ports. To achieve this, PPA has established a Technical Advisory and Consultative Committee (TACC) for the Port of Ashburton.
2. SCOPE
The Port of Ashburton TACC will have an interest in all dredging and disposal activities within the port limits and adjacent approved spoil grounds (Figure 1). These activities may include:
• Capital dredging projects;
• Maintenance dredging projects;
• Dredged material placement within approved spoil grounds; and
• Strategic and administrative issues relating to the above, such as long term dredge management plans, spoil ground capacity management and allocation, new spoil ground site selection or other similar issues as they arise.
In accordance with the National Assessment Guidelines for Dredging (2009)1, the intent of the TACC is to:
• Provide continuity of direction and effort in protecting the local environment of the Port of Ashburton in relation to dredging and material placement;
• Aid communication between stakeholders and provide a forum where points of view can be discussed and conflicts resolved;
• Assist in the establishment, as appropriate, of longer term permitting arrangements through activities such as the provision of comments, review of plans and integration of activities;
• Review ongoing management of dredging and dumping activities in accordance with the guidelines and permitting arrangements; and
1 Available at: https://www.environment.gov.au/marine/publications/national-assessment-guidelines-dredging-2009
TACC TERMS OF REFERENCE PORT OF ASHBURTON
A463863 Page 4 of 9
• Make recommendations to PPA, State agencies and/or relevant Commonwealth agencies as necessary in relation to the above as appropriate.
The role of the TACC is not to duplicate the responsibilities of existing State or Federal agencies. Further, it is not to duplicate or be a substitute for focused consultative groups established under other legislation or process.
It is to provide a single point of reference for dredging planning and management in the Port of Ashburton, and to facilitate the flow of information from these groups/agencies to and from Port of Ashburton stakeholders.
It is envisaged that the TACC will provide opportunities for:
• Proponents to seek comment on a proposal, such as under the National Assessment Guidelines for Dredging (2009). Comment would be collated by the TACC Chair, conflicts resolved and provided back to the proponent for submission to the Department of the Environment and Energy;
• Members to have input to the forward planning of dredging issues within the port, such as spoil ground utilisation; and
• Combining of resources, such as joint research.
3. TACC MEMBERSHIP
Membership is drawn from relevant Commonwealth, State and local government and non-government organisations with expertise, responsibilities or interest in the dredging in the port. The stakeholders represented on the TACC are:
• Pilbara Ports Authority(Chair)
• Chevron Australia;
• Onslow Salt;
• Onslow Chamber of Commerce and Industry;
• Thalanyji people as Traditional Owners (represented by Buurabalayji Thalanyji Aboriginal Corporation);
• WA Department of Parks and Wildlife;
• WA Department of Fisheries;
• WA Department of Transport;
• WA Department of State Development;
• Commonwealth Department of the Environment and Energy; and
• WA Office of the Environmental Protection Authority.
TACC TERMS OF REFERENCE PORT OF ASHBURTON
A463863 Page 5 of 9
PPA typically sends three delegates to TACC meetings, including: Environment and Heritage Manager – West Pilbara (Chair), Harbour Master – Regional Ports, and Dredging Manager. The latter role performs an important function on the TACC, providing specialist advice and information on both planned and completed dredging activities, hydrographic surveys, and metocean equipment installations, as well as status updates on the performance of this equipment.
Current TACC membership and contact details are shown in Schedule 1, which will be updated as required. The principal from the stakeholder organisation will be responsible for circulating material within their respective organisation and providing consolidated feedback as required.
The principal will be responsible for nominating a second and keeping contact details up to date. The Chair will maintain the contacts list in Schedule 1.
In addition to the above stakeholders, the Chair may invite specialist consultants to attend meetings and provide input to the TACC on specific issues. Advice may also be sought from specialist consultants through the Chair outside TACC meetings.
Organisational membership can be changed from time to time as required, either for specific in-port projects, or identified gaps in stakeholder representation. A request will be made through the Chair and considered by the TACC.
Organisations will be responsible for the appropriate selection of a representative on the TACC.
4. MEETINGS
The TACC will meet twice annually, nominally in April and October. Depending on circumstances, additional meetings may be held outside these nominal times.
Pilbara Ports Authority will be responsible for providing secretariat services and meeting facilities.
Meetings will generally be held with video and conference call lines available for those unable to attend in person.
5. QUORUM
A minimum of the Chair (or delegate) and five member stakeholders must attend a meeting to obtain a quorum.
Attendance of a meeting may be in-person or via suitable electronic means.
TACC TERMS OF REFERENCE PORT OF ASHBURTON
A463863 Page 6 of 9
6. AGENDA
The Chair will call for agenda items before the proposed meeting. This will advise of the proposed meeting date, time and location.
The Chair will collate agenda items and circulate an agenda before the meeting date. Where an agenda item requires presentation material at the meeting, the Chair will make all attempts to source this material and provide to stakeholders attending the meeting via electronic means prior to the meeting.
7. MINUTES
Minutes of the meeting will be taken on behalf of the Chair or delegate. These will be circulated to all stakeholders post meeting for comment, and finalised before the next meeting.
PPA will be responsible for retaining copies of meeting minutes, and providing these to member stakeholders upon request.
8. OUT OF SESSION ITEMS
Where an issue arises that cannot be dealt with at a meeting, but does not necessitate calling an additional meeting, the Chair may circulate the required material out-of-session by whatever means are appropriate (e-mail, hardcopy).
The Chair will provide the material, allow sufficient time for consideration (nominally two weeks), collate information and then circulate a summary of the responses and, where appropriate, an outcome.
Out of session material will be limited as much as possible, recognising the value of collective discussions via the TACC meetings.
9. REVIEW OF TERMS OF REFERENCE
A review of the Terms of Reference will be undertaken by members of the TACC every 3rd year or as need arises.
10. VERSION CONTROL
A record will be maintained of changes to this document (Schedule 2). Administrative changes will be made as required. Substantive changes will be circulated to the TACC membership for review and acceptance.
TACC TERMS OF REFERENCE PORT OF ASHBURTON
A463863 Page 7 of 9
TACC TERMS OF REFERENCE PORT OF ASHBURTON
A463863 Page 8 of 9
11. SCHEDULE 1: TACC MEMBERSHIP CONTACT DETAILS
ORGANISATION PRINCIPAL CONTACT SECOND CONTACT
TACC TERMS OF REFERENCE
PORT OF ASHBURTON
A463863 Page 9 of 9
12. SCHEDULE 2: VERSION HISTORY
VERSION NUMBER DATE DESCRIPTION OF CHANGE ADMINISTRATIVE /
SUBSTANTIVE?
OMSB Stage 2: DSDMP Page 73 OMSB Pty Ltd 17WAU-0008 /R1702034
Appendix B Environmental Quality Plan
An existing Environmental Quality Plan (EQP) for Beadon Creek is presented in the Pilbara Coastal Water Quality Consultation Outcomes (DoE, 2006) and shown in Figure A-1 below. Water quality in the High Ecological Protection Area (HEPA) shown in the western tributary of Beadon Creek (Figure A-1), has the potential to be temporarily impacted as a result of dredge tail water discharge to the intertidal area which flows to this tributary. Therefore, discharge water quality from the DMMA is proposed to be monitored during dredging and onshore spoil disposal to achieve:
• A Moderate Level of Ecological Protection at the tail water discharge (Weir box) and at a location to be determined within western tributary of Beadon Creek; and
• A High Level of Ecological Protection in the other upper tributaries of Beadon Creek.
Specific water quality monitoring sites and criteria will be selected and described in the WQMP, which is proposed to be presented to the Port of Ashburton Dredging Technical Advisory and Consultative Committee (TACC) for review and comment.
OMSB Stage 2: DSDMP Page 74 OMSB Pty Ltd 17WAU-0008 /R1702034
Figure A-1 Environmental Quality Plan for Onslow (Including Beadon Creek) (DoE, 2006)
OMSB Stage 2: DSDMP Page 75 OMSB Pty Ltd 17WAU-0008 /R1702034
Appendix C Stage 2 Geotechnical Investigation (GALT Geotechnics 2017)
J1701177 001 R Rev1
www.galtgeo.com.au 4/15 Walters Drive
OSBORNE PARK WA 6017 T: +61 (8) 6272‐0200 01 November 2017
Report on
BOREHOLE DRILLING
BEADON CREEK CHANNEL
ONSLOW
Submitted to:
Wallbridge Gilbert Aztec Pty Ltd
634 Murray Street
WEST PERTH WA 6005
J1701177 001 R Rev1 01 November 2017
Galt Geotechnics Pty Ltd
www.galtgeo.com.au 4/15 Walters Drive OSBORNE PARK WA 6017
Page | i ABN: 64 625 054 729
TABLE OF CONTENTS
1. Introduction ................................................................................................................................................................ 1
2. background ................................................................................................................................................................. 1
3. Objectives .................................................................................................................................................................... 1
4. Methodology ............................................................................................................................................................... 2
4.1 Drilling Rig ........................................................................................................................................................... 2
4.2 Notice to Mariners .............................................................................................................................................. 2
4.3 Work Vessel ......................................................................................................................................................... 3
4.4 Positioning ........................................................................................................................................................... 3
4.5 Predive Checks .................................................................................................................................................... 3
4.6 Drilling Operations .............................................................................................................................................. 4
4.7 Demobilisation .................................................................................................................................................... 4
5. Borehole and Drill Records .......................................................................................................................................... 4
6. Discussion .................................................................................................................................................................... 4
7. closure ......................................................................................................................................................................... 6
TABLE (WITHIN TEXT)
Table 1: Test Locations ........................................................................................................................................................ 1
TABLE (END OF TEXT)
Table A1: Summary of Drilling Records ............................................................................................................................... 1
DRAWING
WGA Engineering Drawing ‐ APH170162‐SK‐07_B: Borehole Locations
APPENDICES
APPENDIX A: BOREHOLE RECORDS AND PHOTOGRAPHS
APPENDIX B: DRILLING RECORDS
APPENDIX C: UNDERSTANDING YOUR REPORT
J1701177 001 R Rev1 01 November 2017
Galt Geotechnics Pty Ltd
www.galtgeo.com.au 4/15 Walters Drive OSBORNE PARK WA 6017
Page | 1 ABN: 64 625 054 729
1. INTRODUCTION
This report presents the results of borehole drilling for the Beadon Creek Channel project in Onslow, Western
Australia. The work was commissioned by Wallbridge Gilbert Aztec Pty Ltd (WGA).
2. BACKGROUND
Beadon Creek is a tidal inlet on the eastern side of the town of Onslow, on the north‐west coast of Western Australia.
The existing Beadon Creek Maritime Facility provides boating support for commercial fishing vessels, charter vessels,
tugs, barges and recreational vessels. We understand that the Department of Transport (DoT) is planning to upgrade
the existing facility to support the growing demand.
The development works will be undertaken by Maritime Constructions Pty Ltd for Onslow Marine Support Base
(OMSB). These works include dredging of a berth pocket and turning basin immediately west of the existing channel.
The dredged material will then be used to create an additional land‐backed wharf area immediately north of the
existing harbour lots. The dredged slurry will be pumped through a pipeline directly to the reclamation area.
3. OBJECTIVES
We understand that Total AMS (TAMS) was engaged by Maritime Constructions to gather geotechnical data to
support the findings of a recent study by the 02 Marine Group. The previous studies included depth probing at
targeted sites which were identified during the marine geophysical investigation (side scan sonar survey) of the inner
and outer approach channels (completed in March 2017).
The main objective of the geotechnical study was to assess subsurface conditions at twelve specified locations,
particularly in relation to proposed dredging activities for the Beadon Creek Channel upgrade. The specified test
locations are shown on WGA engineering drawing ‐ APH170162‐SK‐07_B presented at the end of the text. Test
locations are also presented in Table 1 (Easting and Northing are in MGA94 projection, GDA94 Datum, Zone 50).
Table 1: Test Locations
Drill Site No. Latitude Longitude Easting Northing
DL01 ‐21°36.983' 115°07.505' 305927 7608462
DL02 ‐21°37.296' 115°07.622' 306136 7607888
DL03 ‐21°37.389' 115°07.668' 306217 7607686
DL04 ‐21°37.589' 115°07.757' 306375 7607349
DL05 ‐21°37.884' 115°07.867' 306571 7606807
DL06 ‐21°38.037' 115°07.943' 306707 7606526
DL07 ‐21°38.195' 115°08.009' 306824 7606236
DL08 ‐21°38.381' 115°07.974' 306769 7605893
DL09 ‐21°38.586' 115°07.890' 306628 7605512
DL10 ‐21°38.677' 115°07.934' 306705 7605344
DL11 ‐21°38.663' 115°07.849' 306558 7605369
DL12 & DL12A ‐21°38.692' 115°07.857' 306572 7605315
J1701177 001 R Rev1 01 November 2017
Galt Geotechnics Pty Ltd
www.galtgeo.com.au 4/15 Walters Drive OSBORNE PARK WA 6017
Page | 2 ABN: 64 625 054 729
4. METHODOLOGY
The drilling programme was carried out using equipment owned and operated by TAMS. The drilling operations
included a subsea drilling rig operated by a diver, with support being provided by personnel and equipment stationed
on a nearby work vessel.
4.1 Drilling Rig
The drilling equipment included a subsea track‐mounted, diamond wire‐line triple tube HQ core sampling unit. The
drill rig and hydraulic power unit (HPU) were contained in a 20‐foot sea container. The unit was mobilised from North
Fremantle to the TAMS Onslow Shore Base. A photograph of the drilling rig is presented in Photograph 1.
TAMS operational personnel followed a specific Safe Work Instruction for the use of the Core Sample Drill Rig (CSDR).
Operational procedures, subsea and topside preparation, equipment operation, maintenance and quality control are
detailed in TAMS‐SWI‐004.
Photograph 1: Drill Rig
4.2 Notice to Mariners
Diving operations within the Port of Onslow requires a Notice to Mariners submitted to DoT and approved by the
Harbour Master of Onslow. This was promulgated one week prior to operations commencing. The WMS and relevant
JSEA were submitted and approved prior to project kick off and Ashburton Marine was notified prior to diving
operations on site.
J1701177 001 R Rev1 01 November 2017
Galt Geotechnics Pty Ltd
www.galtgeo.com.au 4/15 Walters Drive OSBORNE PARK WA 6017
Page | 3 ABN: 64 625 054 729
As some borehole locations were within the channel of Beadon Creek, vessel interaction and communication was an
integral part of the schedule planning. TAMS contacted local marine operators utilising Beadon Creek to inform them
of intended diving operations and scheduled daily locations.
4.3 Work Vessel
Work vessel support was provided by AMS Boss; a vessel operated by TAMS, see Photograph 2. All project equipment
was mobilised onto the AMS Boss at the TAMS Wharf in Beadon Creek. We understand that the mobilisation of the
dive system on board the “AMS Boss” was in accordance with TAMS Diving Safety Management System (DSMS). The
dive system was pressure tested, calibrated and certified as per AS/NZS2299.1 requirements prior to use at the site.
Photograph 2: AMS Boss
4.4 Positioning
The borehole positioning and surveying was done by TMAS. The reference datums were:
Easting and Northings referring to GDA94 and MGA Zone 50;
Vertical positioning ‐ Lowest Astronomical Tide (LAT).
Each day the work vessel transited from the TAMS Wharf to site. Once close to the borehole position, the master
directed the deck crew to deploy a surface marker on location. The 8 tonne mooring clump weights used to anchor
the vessel were placed forward and aft to secure the vessel. The mooring of the work vessel was arranged so that the
bow was positioned as near as practicable over the intended sampling location. This was to minimise rig movements
and disturbance on seabed, thus reducing in‐water time.
4.5 Predive Checks
We understand that the divers completed pre‐dive checks and standby diver readiness. Diving operations included
TAMS ‐ Lock Out Tag Out procedure. The DoT and Ashburton Marine were advised of diving operations commencing,
the Alpha flag was raised, and the master monitored any SIMOPS in the vicinity.
J1701177 001 R Rev1 01 November 2017
Galt Geotechnics Pty Ltd
www.galtgeo.com.au 4/15 Walters Drive OSBORNE PARK WA 6017
Page | 4 ABN: 64 625 054 729
4.6 Drilling Operations
After the master and dive supervisor assessed the weather conditions, tide and current, the CSDR was lowered
overboard using the on‐board Hiab crane. The diver entered the water following along the CSDR umbilical. Once in
position, the diver reported on the orientation of the CSDR and confirmed the umbilical was clear. The diver assessed
the seabed for drilling suitability, and stability of the rig during operation. The diver then instructed deck crew to
lower the CSDR to seabed. The diver then tracked the CSDR into position and erected the mast over the sample site in
a vertically upright position. The drilling and sampling then commenced using HQ3 drilling and coring techniques.
Communication between the diver and the on‐board crew, including the geotechnical engineer, was via a microphone
and speakers installed in the diver’s helmet. A video camera mounted on the diver’s helmet was used to send video
to a computer screen mounted in the dive support centre aboard the AMS Boss.
Vision of the drilling operations was available at the on‐board dive centre. Similarly, real time instructions to the
diver/driller were provided from the on‐board dive centre.
4.7 Demobilisation
On completion of the drilling, the equipment was demobilised from the AMS Boss using TAMS Wharf in Beadon Creek.
The drilling equipment was removed from the work vessel and the AMS Boss was secured on TAMS mooring in
Beadon Bay.
5. BOREHOLE AND DRILL RECORDS
Samples were recovered and photographed. Core was only recovered from one of the boreholes, DL12A and was
placed in a core tray, photographed and appropriately packed for transportation.
Borehole records and photographs are presented in Appendix A., Appendix A also includes:
soil descriptions;
explanation of notes, abbreviations, and terms for soil and rock logging; and
a table showing the carbonate rock classification system using the Clark and Walker (1977) approach.
Drill records at borehole locations obtained during the diving/drilling operations are presented in Appendix B. The
drill records show the drilling rates recorded through the full depth of each of the boreholes.
The results of the drilling records have been summarised in Table 1A located at the end of the text.
6. DISCUSSION
Generalised geological mapping has been documented by the Geological Survey of Western Australia in their
1:250 000 Geological Series (1982). The Onslow Sheet is applicable to the site and is published with a set of
explanatory notes. The Onslow Sheet indicates the site is covered with Holocene‐aged surficial deposits associated
with dune, claypan, supratidal and intertidal‐flats.
The surficial soils are shown to be underlain by Tertiary to Quaternary soil and rock. The uppermost of these units has
been referred to in the nearby Wheatstone geotechnical studies as the Ashburton Red Beds. Underlying this, Lower
Tertiary carbonate rocks associated with the Cape Range Formation and Cretaceous glauconitic rocks associated with
either the Toolonga Cacilutite or Gearle Siltstone are indicated on the geological sheet. These carbonate and
glauconitic rocks are not present within the scoped depth of Beadon Creek Channel studies
J1701177 001 R Rev1 01 November 2017
Galt Geotechnics Pty Ltd
www.galtgeo.com.au 4/15 Walters Drive OSBORNE PARK WA 6017
Page | 5 ABN: 64 625 054 729
Results of the drilling programme indicate that much of the proposed dredge zone will occur within the surficial soils.
Full core recovery was only achieved at DL12A from the depth interval of 4.5 to 6.1 m. In all other boreholes,
significant (>90%) core loss occurred in the surficial soils (i.e. predominantly uncemented materials with localised
calcarenite cobbles/boulders).
The summarised results of the drilling records provided in Table A1, at the end of the text, indicate that the rate of
drilling varied from 22 mm to 1,400 mm per minute but was generally greater than 100 mm per minute. Drillers’
comments indicate that drilling was generally easy with only occasional zones noted as slow drilling.
The materials encountered in the boreholes were logged in accordance with AS 1726 (2017) “Geotechnical site
investigations” and typically comprised:
Silty SAND and Clayey SAND – fine to coarse grained, some calcareous gravel and cobbles including some to
many shells.
The standard states that fines content of these soils ranges from 12% to 35% fines. It must be pointed out that
significant core loss occurred and the classification of these soil types was based on the recovery of only a small
amount of sample.
In an offshore borehole (BH14) drilled as part of an earlier geotechnical study1, conducted in May 2014 by CH2MHILL
within Beadon Creek, soils encountered mainly comprised sand with layers of silt, silty sand, clayey sand and clayey
silt. Laboratory testing of two selected samples of the more fine grained samples showed that these samples
contained 33% and 37% fines (particles <0.075 mm size).
In a later sediment quality assessment, conducted in March 2017 by O2 Marine2, samples were collected using vibro coring techniques and grab sampling. The sample locations comprised within Beadon Creek, the inner channel and the outer channel. Particle size distribution testing conducted on a total of 40 samples showed the fines contents ranged as shown in the following table:
Location Number of Samples Percent Fines
Range Average
Beadon Creek 9 1 to 53 15
Inner Channel 15 1 to 22 6
Outer Channel 16 1 to 18 10
The amount of fines visually assessed in this investigation appears to be consistent with those determined in testing
conducted in the CH2MHILL and O2 Marine studies.
1 CH2MHILL (October 2014), Geotechnical Factual Report, Proposed Fishing Platform and Office, Beadon Creek,
Onslow, Western Australia. 2 O2 Marine (July 2017), Sediment Quality Assessment, Onslow Marine Support Base, Stage 2 Capital Dredging,
report number 1701010.
J1701177 001 R Rev1 01 November 2017
Galt Geotechnics Pty Ltd
www.galtgeo.com.au 4/15 Walters Drive OSBORNE PARK WA 6017
Page | 6 ABN: 64 625 054 729
7. CLOSURE
We draw your attention to Appendix C of this report, “Understanding your Report”. The information provided within
is intended to inform you as to what your realistic expectations of this report should be. This information is provided
not to reduce the level of responsibility accepted by Galt, but to ensure that all parties who rely on this report are
aware of the responsibilities each assumes in so doing.
GALT GEOTECHNICS PTY LTD
Fred Davenport CPEng
Geotechnical Engineer
\\galtgeo.local\OsbornePark\Data\Jobs\2017\J1701177 ‐ WGA SI Onslow\03 Correspondence\J1701177 001 R Rev1.docx
J1701177 001 R Rev1 01 November 2017
Galt Geotechnics Pty Ltd
www.galtgeo.com.au 4/15 Walters Drive OSBORNE PARK WA 6017
Page | 7 ABN: 64 625 054 729
Table A1: Summary of Drilling Records
Borehole Depth Range
Rate of Drilling(mm/minute)
Driller’s Comment Borehole Depth Range
Rate of Drilling (mm/minute)
Driller’s Comment
DL01 0.0 ‐ 3.1 69
DL09
0.0 – 1.7 1700 No resistance on the feed
DL02
0.0 ‐ 1.7 113
Slow drilling 1.75‐2.0 m
1.7 – 3.1 233
1.7 ‐ 3.1 66 3.1 – 4.5 350 No resistance on the feed. Handful of
pebbles 20‐30 mm
3.1 ‐ 3.3 22 4.5 – 5.5 250 Slight resistance on the feed. Small pebbles
20‐30 mm
DL03
0.0 ‐ 0.8 114 5.5 – 5.9 400
0.8 ‐ 1.7 900
DL10
0.0 – 1.7 850 Drilling was slow and choking resistance
on the outer tube which slowed rotation
1.7 ‐ 2.1 80 1.7 – 3.1 88
2.1 ‐ 3.1 59 3.1 – 4.5 200
3.1 ‐ 4.5 200 Easy drilling 4.5 – 5.9 1400
DL04
0.0 ‐ 1.7 31
No core recovered
5.9 – 7.3 140
1.7 – 2.3 60
DL11
0.0 – 1.7 850
2.3 ‐ 2.9 120 1.7 – 3.1 700
2.9 ‐ 3.1 40 3.1 – 4.5 233
3.1 ‐ 4.5 40 4.5 – 5.9 467
DL05
0.0 ‐1.7 567 5.9 – 6.5 200 Slight resistance
1.7 ‐ 3.1 1400 6.5 – 7.3 114 Nil resistance
3.1 ‐ 4.5 467 7.3 – 8.3 166
4.5 ‐ 5.9 End time
not provided 8.3 – 8.7 200
DL06
0.0 ‐ 1.7 1700 Zero resistance. Few small pieces of
coral
DL12A
0.0 – 0.8 160 Slight resistance on the
feed. Recovered core – loose pieces of coral and shell
1.7 ‐ 3.1 350 Very little resistance 0.8 – 1.0 33
3.1 ‐ 3.3 75
Slower rate of penetration. Sandy clay – no hard material
1.0 – 1.7 78
3.3 ‐ 3.5 22 1.7 – 2.3 600
Very little resistance on the feed. No core material recovered.
3.5 ‐ 4.3 50 2.3 – 2.5 100
4.3 ‐ 4.5 50 2.5 – 2.9 133
DL07
0.0 ‐ 1.7 850
Nil resistance on feed
2.9 – 3.1 100
1.7 ‐ 3.1 467 3.1 – 3.7 150 Very little resistance on the feed. 3 small
pebbles recovered within the inner tube.
3.1 ‐ 4.5 400 3.7 – 4.5 160
4.5 ‐ 5.5 500 4.5 – 5.7 75 Slight resistance on the feed. Full core recovered. Indicates
of calcareous sandstone and calcareous claystone. Very weakly
cemented.
5.5 ‐ 5.9 133 5.7 – 5.9 100
DL08
0.0 ‐ 1.7 850
1.7 ‐ 3.1 700
3.1 ‐ 4.5 1400
4.5 ‐ 5.9 1400
5.9 ‐ 7.3 140 Slight resistance on the feed
Galt Geotechnics Pty Ltd
www.galtgeo.com.au 4/15 Walters Drive OSBORNE PARK WA 6017
ABN: 64 625 054 729
Drawing
℄
PREL
IMINA
RY IS
SUE
NOT
FOR
CONS
TRUC
TION
P:\J
OB
S\2
017\
1701
62 -
Ons
low
Mar
ine
Sup
ply
Bas
e –
Cap
ital D
redg
ing\
Dra
fting
\SK
ETC
HE
S\A
PH
1701
62-S
K-0
7.dw
g, L
ayou
t1, 3
/8/2
017
1:18
PM
, Wbo
wye
r
When sheet printed full size, the scale bar is 100mm.0 50 100mm
DATE: CHECKED:CHECK PRINT:
C
A1 DRAWING NUMBERSheet No.Job Number Rev.
Design Drawn
634 Murray Street, West PerthWestern Australia 6005
Telephone 08 9336 6528Email [email protected]
REV. DATE DESCRIPTION DRAFT CHKDENG.
SK-07APH170162WB WB
BOREHOLE LOCATIONSCAPITAL DREDGE & NAV AIDSBEADON CREEK, ONSLOWONSLOW MARINE SUPPORT BASE (OMSB)
Drill Site No. Latitude Longitude Easting Northing Seismic Data1 -21°36'58.9923" 115°07'30.2883" 305927.600 7608462.600 No data2 -21°37'17.7339" 115°07'37.3145" 306136.620 7607888.605 Area of rock outcrop3 -21°37'24.3312" 115°07'40.0569" 306217.935 7607686.645 Possible rock4 -21°37'35.3563" 115°07'45.4043" 306375.800 7607349.400 No specific data5 -21°37'53.0486" 115°07'51.9955" 306571.895 7606807.523 End of rock outcrop heading north6 -21°38'02.2441" 115°07'56.5839" 306707.245 7606526.287 Rock outcrop (Extends north)7 -21°38'11.7167" 115°08'00.5223" 306824.000 7606236.300 Rock outcrop (Extends north)8 -21°38'22.8482" 115°07'58.4699" 306769.096 7605893.223 No specific data9 -21°38'35.1731" 115°07'53.4080" 306628.100 7605512.400 Rock outcrop/boulder
10 -21°38'40.6486" 115°07'56.0397" 306705.800 7605344.900 Rock outcrop/boulder11 -21°38'39.7840" 115°07'50.9203" 306558.273 7605369.721 No specific data12 -21°38'41.5363" 115°07'51.3984" 306572.669 7605315.993 No specific data
Galt Geotechnics Pty Ltd
www.galtgeo.com.au 4/15 Walters Drive OSBORNE PARK WA 6017
ABN: 64 625 054 729
Appendix A: Borehole Records and
Photographs
METHOD OF SOIL DESCRIPTIONBOREHOLE AND TEST PIT REPORTSGRAPHIC LOG & UNIFIED SOIL CLASSIFICATION SYSTEM (USCS) SYMBOLSGraphic USCS Graphic USCS
SM
ML
GP MH
GW CL
GC CI
GM CH
SP OL
SW OH
SC Pt
NOTE: Dual classification given for soils with a fines content between 5% and 12%.
SOIL CLASSIFICATION AND INFERRED STRATIGRAPHY
Coarse
Medium
Fine
Coarse
Medium
Fine
SILT
CLAY
Symbol Term
VE Very easy
E Easy
F Firm
H Hard
VH Very hard
Symbol Term Material SymbolDensity
Index (%)
VS Very Soft VL <15
S Soft L 15 to 35
F Firm MD 35 to 65
St Stiff D 65 to 85
VSt Very Stiff VD >85
H Hard
FINES
Symbol
D
M
Soil Name
BOULDERS
COBBLES
GRAVEL
SAND
0.075 to 0.21
0.002 to 0.075
19 to 63
6.7 to 19
2.3 to 6.7
0.6 to 2.36
0.21 to 0.6
PEAT
Organic SILT (high liquid limit)
Organic SILT (low liquid limit)
CLAY (high plasticity)
CLAY (medium plasticity)
100 to 200
>200
Dry
Term
Moist
WetW
Peat
CONSISTENCY
0 to 12 Inorganic
soil
ORGANIC SOILS
Organic soil
12 to 25
25 to 50
Undrained Shear
Strength (kPa)
Soil Name
FILL (various types)
COBBLES / BOULDERS
GRAVEL (poorly graded)
GRAVEL (well graded)
Soil Name
Silty SAND
SILT (low liquid limit)
CLAY (low plasticity)
SILT (high liquid limit)
Clayey GRAVEL
Silty GRAVEL
SAND (poorly graded)
SAND (well graded)
Clayey SAND
Soil descriptions are based on AS1726‐2017. Material properties are assessed in the field by visual/tactile methods in combination with field and
laboratory testing techniques (where used).
NOTE: AS 1726‐2017 defines a fine grained soil where the total dry mass of fine fractions (<0.075 mm particle size) exceeds 35%.
DENSITY
Term
<0.002
PARTICLE SIZE PLASTICITY ‐ MODIFIED CASAGRANDE CHART ‐ AS1726‐2017
CEMENTATIONMOISTURE CONDITIONRESISTANCE TO EXCAVATION
Description
All resistances are
relative to the
selected method of
excavation
Cementation Description
Particle Size (mm)
>200
63 to 200
50 to 1002% to 25%
<2%
Organic Content
% of dry mass
Medium Dense
Dense
Very Dense
Loose
>25%
Very Loose
Soil may be easily
disaggregated by hand
in air or water
Effort is required to
disaggregate the soil
by hand in air or water
Weakly cemented
Moderately cemented
0
10
20
30
40
50
60
0 10 20 30 40 50 60 70 80 90 100
PL
AS
TIC
ITY
IN
DE
X I
p,
%
LIQUID LIMIT WL, %
CH or OH
MH or OHCL or OL
ML or OLCL - ML
A Line
CI or OI
U Line
O:\Administration\Standard Forms and Documents\PMP17 Method of Soil Description‐Rev5
Galt Form PMP17
August 2017
ROCK STRENGTH, WEATHERING AND DEFECTSSTRENGTH
SYMBOL TERM
VL Very Low
L Low
M Medium
H High
VH Very High
EH ExtremelyHigh
WEATHERINGSYMBOL
RS
XW
HW
MW
SW
Fr
DEFECTSTEXTURE / FABRIC
P Parting B Bedding VR Very roughJ Joint La Lamination Ro Rough
SSu Sheared Surface F Foliation Sm SmoothSZ Sheared Zone Cl Cleavage Po PolishedSS Sheared Seam Fl Flow Banding Sl SlickensidedCS Crushed Seam V VeinIS Infilled Seam
WS Extremely Weathered Seam Pl PlanarDI Drilling induced break/fracture Cn Clean Cr Curved
St Stained Un UndulatingVn Veneer St SteppedCt Coating Ir Irregular
CORE DRILLING DETAILSSYMBOL DESCRIPTION DESCRIPTION
TCR Total Core Recovery Top of RunRQD Rock Quality Designation Bottom of Run
Moderately Weathered
Slightly Weathered
Highly Weathered
The whole of the rock material is discoloured, usually by iron staining or bleaching to the extentthat the colour of the original rock is not recognizable. Rock strength is significantlychanged by weathering. Some primary minerals have weathered to clay minerals. Porosity may beincreased by leaching, or may be decreased due to deposition of weathering products in pores.
POINT LOADSTRENGTH
INDEX Is(50) MPaFIELD ASSESSMENT
NOTE: The strength of rock is based on the uniaxial compressive strength (UCS). Where adequate UCS test data is not available,classification of strength may be made on the basis of the point load strength index (Is(50)).
DEFINITIONTERM
UNIAXIALCOMRPESSIVE
STRENGTHMPa
0.6 to 2
2 to 6
6 to 20
20 to 60
Material crumbles under firm blows with sharp end of pick; can bepeeled with a knife; too hard to cut a triaxial sample by hand. Pieces upto 30 mm thick can be broken by finger pressure.Easily scored with a knife; indentations 1 mm to 3 mm show in thespecimen with firm blows of the pick point; has dull sound underhammer. A piece of core 150 mm long by 50 mm diameter may bebroken by hand. Sharp edges of core may be friable and break duringhandling.
more than 10
3 to 10
1 to 3
0.3 to 1
0.1 to 0.3
0.03 to 0.1
SURFACE ROUGHNESSROCK DEFECTS
Readily scored with a knife; a piece of core 150 mm long by 50 mmdiameter can be broken by hand with difficulty.A piece of core 150 mm long by 50 mm diameter cannot be broken byhand but can be broken by a pick with a single blow; rock rings underhammer.Hand specimen breaks with pick after more than one blow; rock ringsunder hammer.Specimen requires many blows with geological pick to break throughintact material; rock rings under hammer.
60 to 200
more than 200
Residual Soil
Rock shows no sign of decomposition of individual minerals or colour changes.NOTE: The term ‘Distinctly Weathered’ may be used where it is not practicable to distinguish between ‘Highly Weathered’ and‘Moderately Weathered’ rock. ‘Distinctly Weathered’ is defined as follows: ‘Rock strength usually changed by weathering. The rock maybe highly discoloured, usually by iron staining. Porosity may be increased by leaching, or may be decreased due to deposition ofweathering products in pores’. There is some change in rock strength.
Fresh
Extremely Weathered
Material is weathered to such an extent that it has soil properties. Mass structure and materialtexture and fabric of original rock are no longer visible, but the soil has not been significantlytransported.Material is weathered to such an extent that it has soil properties. Mass structure and materialtexture and fabric of original rock are still visible.
SYMBOLTORBOR
COATING / INFILLINGSURFACE SHAPE
The whole of the rock material is discoloured, usually by iron staining or bleaching to the extentthat the colour of the original rock is not recognizable, but shows little or no change of strengthfrom fresh rock.Rock is partially discoloured with staining or bleaching along joints but shows little or no change ofstrength from fresh rock.
O:\Administration\Standard Forms and Documents\PMP26 Method of Rock-Rev2Galt Form PMP26
August 2017
BIOCLASTIC OOLITE SHELL CORAL ALGAL PISOLITESOrganic Inorganic Organic Organic Organic Inorganic
Particle size 0.002mm 0.06mm 2mm 50mm
CARBONATE MUD CARBONATE SILT CARBONATE SAND CARBONATE GRAVEL
Clayey CARBONATE MUD Siliceous CARBONATE SILT Siliceous CARBONATE SAND Mixed carbonate and 90
Calcareous CLAY Calcareous SILT Calcareous Silica SAND Non-carbonate GRAVEL 50
CLAY SILT Silica SAND GRAVEL 10
CALCILUTITE (Carbonate claystone) CALCISILTITE CALCARENITE CALCIRUDITE
Clayey CALCILUTITE Siliceous CALCISILTITE Siliceous CALCARENITE Conglomeratic CALCIRUDITE 90
Calcareous CALCILUTITE Calcareous CALCISILTITE Calcareous SANDSTONE Calcareous CONGLOMERATE 50
CLAYSTONE SILTSTONE SANDSTONE CONGLOMERATE OR BRECCIA 10
Detrital LIMESTONE CONGLOMERATE LIMESTONE
Argillaceous LIMESTONE Siliceous LIMESTONE Siliceous Detrital LIMESTONE Conglomeratic LIMESTONE 90
Calcareous LIMESTONE Calcareous LIMESTONE Calcareous SANDSTONE Calcareous CONGLOMERATE 50
CLAYSTONE SILTSTONE SANDSTONE CONGLOMERATE OR BRECCIA 10
Note: Strength categories not consistent with AS 1726-2017
CLARK AND WALKER CLASSIFICATION SYSTEM
Adapted from: Clark, A.R., & Walker, B.F. (1977) A proposed scheme for the classifiaction and nomenclature for use in the engineering descripion of MiddleEastern sedimentary rocks. Géotechnique 27 No. 1, 93-99.
TOTA
L CAR
BONA
TE C
ONTE
NT (%
)(c
onst
ituen
t par
ticle
s plu
s mat
rix)
Very
soft
to H
ard
(<36
-300
kPa
)
Hard
to M
oder
atel
yW
eak
(0.3
-12.
5 M
Pa)
Mod
erat
ely
Stro
ng to
Stro
ng(1
2.5-
100M
Pa)
Stro
ng to
Ext
rem
ely
Stro
ng(7
0->2
00M
Pa)
APPR
OXIM
ATE
UNCO
NFIN
EDCO
MPR
ESSI
VEST
RENG
TH
Descriptive Terms Based on Origin of Constituent ParticlesNot Discernible by Eye
Fine-grained LIMESTONE
CRYSTALLINE LIMESTONE OR MARBLE
(uniform grain size and loss of original texture)
Conventional metamorphic rock nomeclature applies
O:\Administration\Standard Forms and Documents\PMP20 Clark and Walker Classification Rev2Galt Form PMP20
August 2017
Clayey SAND: fine to coarse grained, grey-brown, withsome gravel, many shells, loose
With some calcarenite gravel
With some gravel, loose to medium dense
START CORING AT 0.00m
Hole terminated at 3.15 m
SC
TCR=%SCR=%RQD=%
1.75TCR=%SCR=%RQD=%
1.45 3.15m
1.00m
1.75m
Seabed sample taken
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 12/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL01
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 1 OF 1
Comments:
Easting: 305928 m
Northing: 7608463 mDatum: MGA94 Zone 50
Surface RL: -5.4 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
1 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
PointID : DL01 Depth Range: 0.30 - 1.70 m
PointID : DL01 Depth Range: 1.70 - 3.10 m
PointID : DL01 Depth Range: 0.00 - 0.30 m
A4FIGURE NoPROJECT No
SCALE
CHECKED DATE
DATEDRAWNTITLE
Not To Scale
25/08/2017
25/08/2017
J1701177 1/1
Wallbridge Gilbert AztecOnslow
Beadon Creek ChannelCore Photo - DL01
GA
LT L
IB 1
.01.
GLB
Grf
cTbl
DG
PH
OT
O C
OR
E P
HO
TO
4 P
ER
PA
GE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
09:1
8 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
Clayey SAND: brown-grey, loose
CALCARENITE: red-brown, fine to coarse grained, wellcemented in parts
Clayey SAND: fine to medium grained, brown-grey, withsome calcareous gravel and cobbles, loose to mediumdense
START CORING AT 0.00m
Hole terminated at 3.10 m
SC
SC
TCR=%SCR=%RQD=%
1.75
TCR=%SCR=%RQD=%
1.35
0.25m
0.75m
3.10m
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 13/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL02
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 1 OF 1
Comments:
Easting: 306136 m
Northing: 7607888 mDatum: MGA94 Zone 50
Surface RL: -4.4 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
1 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
PointID : DL02 Depth Range: 0.00 - 1.70 m
A4FIGURE NoPROJECT No
SCALE
CHECKED DATE
DATEDRAWNTITLE
Not To Scale
25/08/2017
25/08/2017
J1701177 1/1
Wallbridge Gilbert AztecOnslow
Beadon Creek ChannelCore Photo - DL02
GA
LT L
IB 1
.01.
GLB
Grf
cTbl
DG
PH
OT
O C
OR
E P
HO
TO
4 P
ER
PA
GE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
09:1
8 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
Clayey SAND: fine to coarse grained, grey-brown, withsome shells, loose
CALCARENITE: well cemented, red-brown andyellow-white zone
Clayey SAND: red-brown and white-grey, with some fineto coarse grained calcareous gravel, loose to mediumdense
Some calcareous gravel and cobbles
START CORING AT 0.00m
Hole terminated at 4.55 m
SC
SC
TCR=%SCR=%RQD=%
1.75
TCR=%SCR=%RQD=%
1.40
TCR=%SCR=%RQD=%
1.40
0.15m
0.40m
4.55m
2.00m
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 13/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL03
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 1 OF 1
Comments:
Easting: 306218 m
Northing: 7607687 mDatum: MGA94 Zone 50
Surface RL: -3.9 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
1 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
PointID : DL03 Depth Range: 1.70 - 3.10 m
PointID : DL03 Depth Range: 0.00 - 1.70 m
A4FIGURE NoPROJECT No
SCALE
CHECKED DATE
DATEDRAWNTITLE
Not To Scale
25/08/2017
25/08/2017
J1701177 1/1
Wallbridge Gilbert AztecOnslow
Beadon Creek ChannelCore Photo - DL03
GA
LT L
IB 1
.01.
GLB
Grf
cTbl
DG
PH
OT
O C
OR
E P
HO
TO
4 P
ER
PA
GE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
09:1
8 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
Clayey SAND:fine to coarse grained, red-brown, withsome fine to coarse grained gravel, with some shells,loose
Some thin calcareous zones, some gravel
Medium dense
Sandy CLAY: red-brown, fine to coarse grained sand,with some gravel, with some shells, very stiff to hard(possibly red bed material)
START CORING AT 0.00m
Hole terminated at 4.55 m
SC
CL
TCR=%SCR=%RQD=%
1.75
TCR=%SCR=%RQD=%
1.40
TCR=%SCR=%RQD=%
1.40
3.50m
4.55m
0.80m
2.00m
Seabed sample taken
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 14/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL04
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 1 OF 1
Comments:
Easting: 306375 m
Northing: 7607349 mDatum: MGA94 Zone 50
Surface RL: -3.7 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
1 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
PointID : DL04 Depth Range: 3.10 - 4.20 m
PointID : DL04 Depth Range: 0.30 - 1.70 m
PointID : DL04 Depth Range: 2.00 - 2.50 m
PointID : DL04 Depth Range: 0.00 - 0.30 m
A4FIGURE NoPROJECT No
SCALE
CHECKED DATE
DATEDRAWNTITLE
Not To Scale
25/08/2017
25/08/2017
J1701177 1/2
Wallbridge Gilbert AztecOnslow
Beadon Creek ChannelCore Photo - DL04
GA
LT L
IB 1
.01.
GLB
Grf
cTbl
DG
PH
OT
O C
OR
E P
HO
TO
4 P
ER
PA
GE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
09:1
8 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
PointID : DL04 Depth Range: 4.20 - 4.50 m
A4FIGURE NoPROJECT No
SCALE
CHECKED DATE
DATEDRAWNTITLE
Not To Scale
25/08/2017
25/08/2017
J1701177 2/2
Wallbridge Gilbert AztecOnslow
Beadon Creek ChannelCore Photo - DL04
GA
LT L
IB 1
.01.
GLB
Grf
cTbl
DG
PH
OT
O C
OR
E P
HO
TO
4 P
ER
PA
GE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
09:1
8 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
Clayey SAND:fine to coarse grained, grey-brown, withsome gravel, with some shells, loose
Some fine to coarse calcareous gravel
Minor bands of calcarenite
Loose to medium dense
START CORING AT 0.00m
Hole terminated at 4.55 m
SC
TCR=%SCR=%RQD=%
1.75
TCR=%SCR=%RQD=%
1.40
TCR=%SCR=%RQD=%
1.40 4.55m
1.75m
2.80m
3.15m
Seabed sample taken
HQ
3
B-01
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 14/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL05
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 1 OF 1
Comments:
Easting: 306571 m
Northing: 7606807 mDatum: MGA94 Zone 50
Surface RL: -3.2 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
1 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
PointID : DL05 Depth Range: 3.10 - 3.20 m
PointID : DL05 Depth Range: 0.20 - 1.70 m
PointID : DL05 Depth Range: 1.70 - 3.10 m
PointID : DL05 Depth Range: 0.00 - 0.20 m
A4FIGURE NoPROJECT No
SCALE
CHECKED DATE
DATEDRAWNTITLE
Not To Scale
25/08/2017
25/08/2017
J1701177 1/1
Wallbridge Gilbert AztecOnslow
Beadon Creek ChannelCore Photo - DL05
GA
LT L
IB 1
.01.
GLB
Grf
cTbl
DG
PH
OT
O C
OR
E P
HO
TO
4 P
ER
PA
GE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
09:1
8 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
Clayey SAND:fine to coarse grained, grey-brown, withsome gravel, with some shells, loose
With some zones of gravel
With some zones of broken calcarenite
Sandy CLAY: red-brown, high silt content, firm to stiff(possibly red bed material)
START CORING AT 0.00m
Hole terminated at 4.55 m
SC
CL
TCR=%SCR=%RQD=%
1.75
TCR=%SCR=%RQD=%
1.40
TCR=%SCR=%RQD=%
1.40
3.90m
4.55m
1.50m
3.40m
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 15/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL06
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 1 OF 1
Comments:
Easting: 306707 m
Northing: 7606526 mDatum: MGA94 Zone 50
Surface RL: -2.8 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
1 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
PointID : DL06 Depth Range: 1.70 - 3.10 m
PointID : DL06 Depth Range: 3.10 - 4.50 m
PointID : DL06 Depth Range: 0.00 - 1.70 m
A4FIGURE NoPROJECT No
SCALE
CHECKED DATE
DATEDRAWNTITLE
Not To Scale
25/08/2017
25/08/2017
J1701177 1/1
Wallbridge Gilbert AztecOnslow
Beadon Creek ChannelCore Photo - DL06
GA
LT L
IB 1
.01.
GLB
Grf
cTbl
DG
PH
OT
O C
OR
E P
HO
TO
4 P
ER
PA
GE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
09:1
8 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
Silty SAND: fine to medium grained, grey-brown, someshells, some calcarenite gravel, some clay, loose
Zones of calcarenite gravel, fine to coarse gravel
START CORING AT 0.00m
SM
TCR=%SCR=%RQD=%
1.80
TCR=%SCR=%RQD=%
1.40
TCR=%SCR=%RQD=%
1.40
TCR=%SCR=%RQD=%
3.00m
Push tube sample taken PVC75 mm (0-0.5 m depth)
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 18/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL07
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 1 OF 2
Comments:
Easting: 306824 m
Northing: 7606236 mDatum: MGA94 Zone 50
Surface RL: -1.4 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
1 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Silty SAND: fine to medium grained, grey-brown, someshells, some calcarenite gravel, some clay, loose(continued)
Hole terminated at 5.95 m
SM
TCR=%SCR=%RQD=%
1.35 5.95m
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 18/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL07
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 2 OF 2
Comments:
Easting: 306824 m
Northing: 7606236 mDatum: MGA94 Zone 50
Surface RL: -1.4 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
1 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
PointID : DL07 Depth Range: 4.50 - 5.90 m
PointID : DL07 Depth Range: 1.70 - 3.10 m
PointID : DL07 Depth Range: 3.10 - 4.50 m
PointID : DL07 Depth Range: 0.00 - 0.50 m
A4FIGURE NoPROJECT No
SCALE
CHECKED DATE
DATEDRAWNTITLE
Not To Scale
25/08/2017
25/08/2017
J1701177 1/1
Wallbridge Gilbert AztecOnslow
Beadon Creek ChannelCore Photo - DL07
GA
LT L
IB 1
.01.
GLB
Grf
cTbl
DG
PH
OT
O C
OR
E P
HO
TO
4 P
ER
PA
GE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
09:1
8 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
Silty SAND: fine to medium grained, grey-brown, someshells, some gravel, loose
START CORING AT 0.00m
SM
Push tube sample taken PVC75 mm (0-0.5 m depth)
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 18/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL08
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 1 OF 2
Comments:
Easting: 306769 m
Northing: 7605893 mDatum: MGA94 Zone 50
Surface RL: -0.8 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
1 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Silty SAND: fine to medium grained, grey-brown, someshells, some gravel, loose (continued)Some zones of fine to coarse calcareous gravel
Hole terminated at 7.35 m
SM
7.35m
5.00m
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 18/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL08
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 2 OF 2
Comments:
Easting: 306769 m
Northing: 7605893 mDatum: MGA94 Zone 50
Surface RL: -0.8 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
1 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
PointID : DL08 Depth Range: 0.30 - 0.80 m
PointID : DL08 Depth Range: 7.00 - 7.30 m
PointID : DL08 Depth Range: 0.00 - 0.30 m
A4FIGURE NoPROJECT No
SCALE
CHECKED DATE
DATEDRAWNTITLE
Not To Scale
25/08/2017
25/08/2017
J1701177 1/1
Wallbridge Gilbert AztecOnslow
Beadon Creek ChannelCore Photo - DL08
GA
LT L
IB 1
.01.
GLB
Grf
cTbl
DG
PH
OT
O C
OR
E P
HO
TO
4 P
ER
PA
GE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
09:1
8 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
Silty SAND: fine to medium grained, grey-brown, someshells, some clay, zones of calcareous gravel, loose tomedium dense
Loose to medium, dense, zone of fine to coarsecalcareous gravel
START CORING AT 0.00m
SM
TCR=%SCR=%RQD=%
1.80
TCR=%SCR=%RQD=%
1.40
TCR=%SCR=%RQD=%
1.40
TCR=%SCR=%RQD=%
1.80m
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 17/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL09
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 1 OF 2
Comments:
Easting: 306630 m
Northing: 7605515 mDatum: MGA94 Zone 50
Surface RL: -2.3 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
1 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Silty SAND: fine to medium grained, grey-brown, someshells, some clay, zones of calcareous gravel, loose tomedium dense (continued)
Hole terminated at 5.95 m
SM
TCR=%SCR=%RQD=%
1.35 5.95m
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 17/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL09
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 2 OF 2
Comments:
Easting: 306630 m
Northing: 7605515 mDatum: MGA94 Zone 50
Surface RL: -2.3 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
1 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
PointID : DL09 Depth Range: 3.10 - 4.50 m
PointID : DL09 Depth Range: 1.70 - 3.10 m
A4FIGURE NoPROJECT No
SCALE
CHECKED DATE
DATEDRAWNTITLE
Not To Scale
25/08/2017
25/08/2017
J1701177 1/1
Wallbridge Gilbert AztecOnslow
Beadon Creek ChannelCore Photo - DL09
GA
LT L
IB 1
.01.
GLB
Grf
cTbl
DG
PH
OT
O C
OR
E P
HO
TO
4 P
ER
PA
GE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
09:1
8 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
Silty SAND: fine to coarse grained, pale brown, withsome shells, with some calcareous gravel
SAND: fine grained with some medium to coarsegrained, pale brown, some shells, some calcareousgravel, some silt, loose to medium dense
START CORING AT 0.00m
Hole terminated at 4.55 m
SM
SP
TCR=%SCR=%RQD=%
1.75
TCR=%SCR=%RQD=%
1.40
TCR=%SCR=%RQD=%
1.40
2.40m
4.55m
4.00: Borehole sidescollapsing. Drillingdiscontinued. Note: secondborehole DL10A discontinuedat 2.5 m
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 15/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL10
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 1 OF 1
Comments:
Easting: 306705 m
Northing: 7605344 mDatum: MGA94 Zone 50
Surface RL: -1.3 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
1 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
PointID : DL10 Depth Range: 2.50 - 3.10 m
PointID : DL10 Depth Range: 3.10 - 4.50 m
PointID : DL10 Depth Range: 2.20 - 2.50 m
A4FIGURE NoPROJECT No
SCALE
CHECKED DATE
DATEDRAWNTITLE
Not To Scale
25/08/2017
25/08/2017
J1701177 1/1
Wallbridge Gilbert AztecOnslow
Beadon Creek ChannelCore Photo - DL10
GA
LT L
IB 1
.01.
GLB
Grf
cTbl
DG
PH
OT
O C
OR
E P
HO
TO
4 P
ER
PA
GE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
09:1
9 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
Silty SAND: fine to coarse grained, grey-brown, someclay, some shells, loose
Loose to medium dense, some calcareous gravel
START CORING AT 0.00m
SM
TCR=%SCR=%RQD=%
1.80
TCR=%SCR=%RQD=%
1.40
TCR=%SCR=%RQD=%
1.40
TCR=%SCR=%RQD=%
1.80m
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 16/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL11
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 1 OF 2
Comments:
Easting: 306558 m
Northing: 7605369 mDatum: MGA94 Zone 50
Surface RL: -0.6 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
1 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Silty SAND: fine to coarse grained, grey-brown, someclay, some shells, loose (continued)
Hole terminated at 8.75 m
SM
TCR=%SCR=%RQD=%
1.40
TCR=%SCR=%RQD=%
1.40
TCR=%SCR=%RQD=%
1.35 8.75m
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 16/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL11
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 2 OF 2
Comments:
Easting: 306558 m
Northing: 7605369 mDatum: MGA94 Zone 50
Surface RL: -0.6 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
1 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
PointID : DL11 Depth Range: 1.70 - 3.10 m
PointID : DL11 Depth Range: 3.10 - 4.50 m
PointID : DL11 Depth Range: 0.00 - 0.20 m
A4FIGURE NoPROJECT No
SCALE
CHECKED DATE
DATEDRAWNTITLE
Not To Scale
25/08/2017
25/08/2017
J1701177 1/1
Wallbridge Gilbert AztecOnslow
Beadon Creek ChannelCore Photo - DL11
GA
LT L
IB 1
.01.
GLB
Grf
cTbl
DG
PH
OT
O C
OR
E P
HO
TO
4 P
ER
PA
GE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
09:1
9 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
Silty SAND: fine to medium grained, grey-brown, someshells, some clay, some gravel, loose
START CORING AT 0.00m
Hole terminated at 1.75 mDifficulty drilling, relocate to DL12A
SM
1.75m
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 17/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL12
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 1 OF 1
Comments:
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
1 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Easting: 306572 m
Northing: 7605315 m
Datum: MGA94 Zone 50
Surface RL: -3.1 m LAT
Silty SAND: fine to medium grained, grey-brown, somegravel and cobble size pieces, some shells, loose
Full core recoveryCALCARENITE GravelCALCARENITE: fine to coarse grained, well cemented
Calcareous SANDSTONE: fine to coarse grained,red-brown, weakly cemented
START CORING AT 0.00m
SM
TCR=%SCR=%RQD=%
1.80
TCR=%SCR=%RQD=%
1.40
TCR=%SCR=%RQD=%
1.40
TCR=%SCR=%RQD=%
4.55m
2.00m
4.60m4.65m
4.75m
4.90m
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 17/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL12A
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 1 OF 2
Comments:
Easting: 306581 m
Northing: 7605314 mDatum: MGA94 Zone 50
Surface RL: -3.4 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
2 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Loose to medium dense, some fine to coarsecalcareous gravel
Full core recovery (continued)Calcareous SANDSTONE and CalcareousCLAYSTONE: red-brown, weakly cemented
Hole terminated at 6.10 m
TCR=%SCR=%RQD=%
1.50
HQ
3
EL
VL
L M H VH
EH
ESTIMATED STRENGTHIs(50)
-0.0
3
-0.1
-0.3
-1 -3 -10
20 40 100
300
1000
VIS
UA
L (joints, partings, seams, zones, etc)
Description, orientation, infillingor coating, shape, roughness,
thickness, other
DESCRIPTIONROCK TYPE : Colour, Grain size, Structure
(texture, fabric, mineral composition, hardnessalteration, cementation, etc as applicable)
US
CS
SY
MB
OL
CO
RE
RU
N
DE
TA
ILS
- Axial - Diametral - Irregular
NATURALFRACTURE
(mm)
FRACTURESPROGRESS ADDITIONAL DATA
Wea
ther
ing
MATERIAL
GR
AP
HIC
LOG
DR
ILLI
NG
& C
AS
ING
DE
PT
H (
m)
DRILLING
SA
MP
LES
&F
IELD
TE
ST
S
WA
TE
RContractor: TAMS
Drill Rig: SubmersibleInclination: -90°
Job Number: J1701177
Client: Wallbridge Gilbert Aztec
Project: Beadon Creek Channel
Location: Onslow
Date: 17/08/2017
Logged: PZChecked Date: 24/08/2017
Checked By: RP
BOREHOLE: DL12A
See Explanatory Notes and Method of Soil Description sheets fordetails of abbreviations and basis of descriptions
Sheet 2 OF 2
Comments:
Easting: 306581 m
Northing: 7605314 mDatum: MGA94 Zone 50
Surface RL: -3.4 m LAT
GA
LT L
IB 1
.01.
GLB
Log
GG
_CO
RE
D_B
OR
EH
OLE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
13:4
2 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
PointID : DL12A Depth Range: 6.00 - 6.10 m
PointID : DL12A Depth Range: 0.20 - 1.70 m
PointID : DL12A Depth Range: 0.00 - 0.20 m
A4FIGURE NoPROJECT No
SCALE
CHECKED DATE
DATEDRAWNTITLE
Not To Scale
25/08/2017
25/08/2017
J1701177 1/1
Wallbridge Gilbert AztecOnslow
Beadon Creek ChannelCore Photo - DL12A
GA
LT L
IB 1
.01.
GLB
Grf
cTbl
DG
PH
OT
O C
OR
E P
HO
TO
4 P
ER
PA
GE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
09:1
9 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
PointID : DL12A Depth Range: 1.70 - 4.50 m
PointID : DL12A Depth Range: 4.50 - 6.10 m
A4FIGURE NoPROJECT No
SCALE
CHECKED DATE
DATEDRAWNTITLE
Not To Scale
25/08/2017
25/08/2017
J1701177 1/1
Wallbridge Gilbert AztecOnslow
Beadon Creek ChannelCore Photo - DL12A
GA
LT L
IB 1
.01.
GLB
Grf
cTbl
DG
PH
OT
O C
OR
E P
HO
TO
4 P
ER
PA
GE
J17
0117
7.G
PJ
<<
Dra
win
gFile
>>
25/
08/2
017
09:1
9 8
.30.
003
Dat
gel D
GD
, CP
T, P
hoto
, Mon
itorin
g T
ools
| Li
b: G
ALT
1.0
1 20
13-0
2-21
Prj:
GA
LT 1
.01
2013
-02-
21
Galt Geotechnics Pty Ltd
www.galtgeo.com.au 4/15 Walters Drive OSBORNE PARK WA 6017
ABN: 64 625 054 729
Appendix B: Drilling Records
C. Rutter
‐5.4
‐7.0 1.6 3.1FINAL
LAT‐8.5
CountMast
Marker
Rod
LengthDepth LAT RUN TIME
1B 2.4 0 0.0 ‐5.4 13:40
1B 2.2 0 0.2 ‐5.6
1B 2.0 0 0.4 ‐5.8
1B 1.8 0 0.6 ‐6.0
1B 1.6 0 0.8 ‐6.2
1B 1.4 0 1.0 ‐6.4
1B 1.2 0 1.2 ‐6.6
1B 1.0 0 1.4 ‐6.8
1B 0.8 0 1.6 ‐7.0
1B 0.7 0 1.7 ‐7.1
1B 1R 2.1 1.4 1.7 ‐7.1
1B 1R 1.9 1.4 1.9 ‐7.3
1B 1R 1.7 1.4 2.1 ‐7.5
1B 1R 1.5 1.4 2.3 ‐7.7
1B 1R 1.3 1.4 2.5 ‐7.9
1B 1R 1.1 1.4 2.7 ‐8.1
1B 1R 0.9 1.4 2.9 ‐8.3
1B 1R 0.7 1.4 3.1 ‐8.5 14:25
DATE DIVER DEPTH 7.8LAT
TIME START TIDE 2.4
REQUESTED LAT
DEPTH
SUBSEA COMMENTS TOPSIDE COMMENTS
FINAL DRILL DEPTH
BELOW SEABEDDRILL DEPTH REQUIRED BSB
CLIENT / PROJECT OMSB / MARITIME CONSTRUCTION DRILL SITE No. DL01 DIVER
12‐Aug‐17
13:40
COORDINATES21° 36.983
Tide Ref ‐ Austides 2017 ‐ Onslow115° 07.505
T. Whitham
‐4.4
‐7.0 2.6 3.3FINAL
LAT‐7.7
CountMast
Marker
Rod
LengthDepth LAT RUN TIME
1B 2.4 0 0.0 ‐4.4 10:00
1B 2.2 0 0.2 ‐4.6
1B 2.0 0 0.4 ‐4.8
1B 1.8 0 0.6 ‐5.0
1B 1.6 0 0.8 ‐5.2
1B 1.4 0 1.0 ‐5.4
1B 1.2 0 1.2 ‐5.6
1B 1.0 0 1.4 ‐5.8
1B 0.8 0 1.6 ‐6.0
1B 0.7 0 1.7 ‐6.1 10:15
1B 1R 2.1 1.4 1.7 ‐6.1 11:44
1B 1R 1.9 1.4 1.9 ‐6.3
1B 1R 1.7 1.4 2.1 ‐6.5
1B 1R 1.5 1.4 2.3 ‐6.7
1B 1R 1.3 1.4 2.5 ‐6.9
1B 1R 1.1 1.4 2.7 ‐7.1
1B 1R 0.9 1.4 2.9 ‐7.3
1B 1R 0.7 1.4 3.1 ‐7.5 12:05
1B 1R 0.7 1.4 3.3 ‐7.7 12:14
Slow Drilling 1.75m to 2.0m
DATE 13‐Aug‐17 DIVER DEPTH 5.5LAT
TIME START 10:00 TIDE 1.1
REQUESTED LAT
DEPTHREQUIRED DRILL DEPTH BSB
FINAL DRILL DEPTH
BELOW SEABED
SUBSEA COMMENTS TOPSIDE COMMENTS
COORDINATES21° 37.296
Tide Ref ‐ Austides 2017 ‐ Onslow115° 07.622
CLIENT / PROJECT OMSB / MARITIME CONSTRUCTION DRILL SITE No. DL02 DIVER
S. Franko
‐3.9
‐7.0 3.1 4.5FINAL
LAT‐8.4
CountMast
Marker
Rod
LengthDepth LAT RUN TIME
1B 2.4 0 0.0 ‐3.9 15:40
1B 2.2 0 0.2 ‐4.1
1B 2.0 0 0.4 ‐4.3
1B 1.8 0 0.6 ‐4.5
1B 1.6 0 0.8 ‐4.7 15:47
1B 1.4 0 1.0 ‐4.9
1B 1.2 0 1.2 ‐5.1
1B 1.0 0 1.4 ‐5.3
1B 0.8 0 1.6 ‐5.5
1B 0.7 0 1.7 ‐5.6 15:48
1B 1R 2.1 1.4 1.7 ‐5.6 16:10
1B 1R 1.9 1.4 1.9 ‐5.8
1B 1R 1.7 1.4 2.1 ‐6.0 16:15
1B 1R 1.5 1.4 2.3 ‐6.2
1B 1R 1.3 1.4 2.5 ‐6.4
1B 1R 1.1 1.4 2.7 ‐6.6
1B 1R 0.9 1.4 2.9 ‐6.8
1B 1R 0.7 1.4 3.1 ‐7.0 16:32
1B 2R 2.1 2.8 3.1 ‐7.0 16:50
1B 2R 1.9 2.8 3.3 ‐7.2
1B 2R 1.7 2.8 3.5 ‐7.4
1B 2R 1.5 2.8 3.7 ‐7.6
1B 2R 1.3 2.8 3.9 ‐7.8
1B 2R 1.1 2.8 4.1 ‐8.0
1B 2R 0.9 2.8 4.3 ‐8.2
1B 2R 0.7 2.8 4.5 ‐8.4 16:57
COORDINATES21° 37.389
Tide Ref ‐ Austides 2017 ‐ Onslow115° 07.668
CLIENT / PROJECT OMSB / MARITIME CONSTRUCTION DRILL SITE No. DL03 DIVER
DATE 13‐Aug‐17 DIVER DEPTH 6LAT
TIME START 15:40 TIDE 2.1
REQUESTED LAT
DEPTHDRILL DEPTH REQUIRED BSB
FINAL DRILL DEPTH
BELOW SEABED
SUBSEA COMMENTS TOPSIDE COMMENTS
easy drilling
Low visability
D. Mellett
‐3.9
‐7.0 3.1 4.5FINAL
LAT‐8.4
CountMast
Marker
Rod
LengthDepth LAT RUN TIME
1B 2.4 0 0.0 ‐3.9 08:40
1B 2.2 0 0.2 ‐4.1
1B 2.0 0 0.4 ‐4.3
1B 1.8 0 0.6 ‐4.5
1B 1.6 0 0.8 ‐4.7
1B 1.4 0 1.0 ‐4.9
1B 1.2 0 1.2 ‐5.1
1B 1.0 0 1.4 ‐5.3
1B 0.8 0 1.6 ‐5.5
1B 0.7 0 1.7 ‐5.6 09:35
1B 1R 2.1 1.4 1.7 ‐5.6 09:40
1B 1R 1.9 1.4 1.9 ‐5.8
1B 1R 1.7 1.4 2.1 ‐6.0
1B 1R 1.5 1.4 2.3 ‐6.2 09:50
1B 1R 1.3 1.4 2.5 ‐6.4
1B 1R 1.1 1.4 2.7 ‐6.6
1B 1R 0.9 1.4 2.9 ‐6.8 09:55
1B 1R 0.7 1.4 3.1 ‐7.0 10:00
1B 2R 2.1 2.8 3.1 ‐7.0 10:15
1B 2R 1.9 2.8 3.3 ‐7.2
1B 2R 1.7 2.8 3.5 ‐7.4
1B 2R 1.5 2.8 3.7 ‐7.6
1B 2R 1.3 2.8 3.9 ‐7.8
1B 2R 1.1 2.8 4.1 ‐8.0
1B 2R 0.9 2.8 4.3 ‐8.2
1B 2R 0.7 2.8 4.5 ‐8.4 10:50
No core recovered to surface in this
section
DRILL DEPTH REQUIRED
Final drill depth
No core recovered to surface in this
section
COMMENTS
Easy no resistence
No core recovered to surface in this
section
TOPSIDE COMMENTS
REQUESTED LAT
DEPTH
FINAL DRILL DEPTH
BELOW SEABED
COORDINATES21° 37.588
115° 07.757
DATE DIVER DEPTH 4.8LAT
TIME START TIDE 0.9
Tide Ref ‐ Austides 2017 ‐ Onslow
14‐Aug‐17
08:40
CLIENT / PROJECT OMSB / MARITIME CONSTRUCTION DRILL SITE No. DL04 DIVER
J. Hayes
‐3.2
‐7.0 3.8 4.5FINAL
LAT‐7.7
CountMast
Marker
Rod
LengthDepth LAT RUN TIME
1B 2.4 0 0.0 ‐3.2 13:25
1B 2.2 0 0.2 ‐3.4
1B 2.0 0 0.4 ‐3.6
1B 1.8 0 0.6 ‐3.8
1B 1.6 0 0.8 ‐4.0
1B 1.4 0 1.0 ‐4.2
1B 1.2 0 1.2 ‐4.4
1B 1.0 0 1.4 ‐4.6
1B 0.8 0 1.6 ‐4.8
1B 0.7 0 1.7 ‐4.9 13:28
1B 1R 2.1 1.4 1.7 ‐4.9 13:44
1B 1R 1.9 1.4 1.9 ‐5.1
1B 1R 1.7 1.4 2.1 ‐5.3
1B 1R 1.5 1.4 2.3 ‐5.5
1B 1R 1.3 1.4 2.5 ‐5.7
1B 1R 1.1 1.4 2.7 ‐5.9
1B 1R 0.9 1.4 2.9 ‐6.1
1B 1R 0.7 1.4 3.1 ‐6.3 13:45
1B 2R 2.1 2.8 3.1 ‐6.3 14:05
1B 2R 1.9 2.8 3.3 ‐6.5
1B 2R 1.7 2.8 3.5 ‐6.7
1B 2R 1.5 2.8 3.7 ‐6.9
1B 2R 1.3 2.8 3.9 ‐7.1
1B 2R 1.1 2.8 4.1 ‐7.3
1B 2R 0.9 2.8 4.3 ‐7.5
1B 2R 0.7 2.8 4.5 ‐7.7 14:08
1B 3R 2.1 4.2 4.5 ‐7.7
1B 3R 1.9 4.2 4.7 ‐7.9
1B 3R 1.7 4.2 4.9 ‐8.1
1B 3R 1.5 4.2 5.1 ‐8.3
1B 3R 1.3 4.2 5.3 ‐8.5
1B 3R 1.1 4.2 5.5 ‐8.7
1B 3R 0.9 4.2 5.7 ‐8.9
1B 3R 0.7 4.2 5.9 ‐9.1
DIVER
COORDINATES21° 37.884
115° 07.867
FINAL DRILL DEPTH
BELOW SEABED
Tide Ref ‐ Austides 2017 ‐ Onslow
14‐Aug‐17
13:25
DRILL DEPTH REQUIRED BSB
DATE DIVER DEPTH 5.2LAT
TIME START TIDE 2.0
REQUESTED LAT
DEPTH
SUBSEA COMMENTS
CLIENT / PROJECT OMSB / MARITIME CONSTRUCTION DRILL SITE No. DL05
TOPSIDE COMMENTS
1m visability, hard bottom
very easy travel
very easy travel
very easy travel
very easy travel
C. Rutter
‐2.8
‐7.0 4.2 4.5FINAL
LAT‐7.3
CountMast
Marker
Rod
LengthDepth LAT RUN TIME
1B 2.4 0 0.0 ‐2.8 07:55
1B 2.2 0 0.2 ‐3.0
1B 2.0 0 0.4 ‐3.2
1B 1.8 0 0.6 ‐3.4
1B 1.6 0 0.8 ‐3.6
1B 1.4 0 1.0 ‐3.8
1B 1.2 0 1.2 ‐4.0
1B 1.0 0 1.4 ‐4.2
1B 0.8 0 1.6 ‐4.4
1B 0.7 0 1.7 ‐4.5 07:55
1B 1R 2.1 1.4 1.7 ‐4.5 08:07
1B 1R 1.9 1.4 1.9 ‐4.7
1B 1R 1.7 1.4 2.1 ‐4.9
1B 1R 1.5 1.4 2.3 ‐5.1
1B 1R 1.3 1.4 2.5 ‐5.3
1B 1R 1.1 1.4 2.7 ‐5.5
1B 1R 0.9 1.4 2.9 ‐5.7
1B 1R 0.7 1.4 3.1 ‐5.9 08:11
1B 2R 2.1 2.8 3.1 ‐5.9 08:27
1B 2R 1.9 2.8 3.3 ‐6.1 08:31
1B 2R 1.7 2.8 3.5 ‐6.3 08:40
1B 2R 1.5 2.8 3.7 ‐6.5
1B 2R 1.3 2.8 3.9 ‐6.7
1B 2R 1.1 2.8 4.1 ‐6.9
1B 2R 0.9 2.8 4.3 ‐7.1 08:56
1B 2R 0.7 2.8 4.5 ‐7.3 09:00
Very little resistance
Small handfull of material recovered,
sandy clay. No hard material
Slower rate of penetration
↕
↕
↕
↕
↕
↕
Zero resistance ‐ firm sandy bottom
underfoot
Very small recovery in the splits, few
small pieces of coral
DATE DIVER DEPTH 3.8LAT
TIME START TIDE 1.0
REQUESTED LAT
DEPTH
SUBSEA COMMENTS TOPSIDE COMMENTS
FINAL DRILL LAT
BELOW SEABED
CLIENT / PROJECT OMSB / MARITIME CONSTRUCTION DRILL SITE No. DL06 DIVER
COORDINATES21° 38.037
Tide Ref ‐ Austides 2017 ‐ Onslow115° 07.943
REQUIRED DRILL DEPTH BSB
15‐Aug‐17
07:55
C.Rutter
‐1.4
‐7.0 5.6 5.9FINAL
LAT‐7.3
CountMast
Marker
Rod
LengthDepth LAT RUN TIME
1B 2.4 0 0.0 ‐1.4 07:34
1B 2.2 0 0.2 ‐1.6
1B 2.0 0 0.4 ‐1.8
1B 1.8 0 0.6 ‐2.0
1B 1.6 0 0.8 ‐2.2
1B 1.4 0 1.0 ‐2.4
1B 1.2 0 1.2 ‐2.6
1B 1.0 0 1.4 ‐2.8
1B 0.8 0 1.6 ‐3.0
1B 0.7 0 1.7 ‐3.1 07:36
1B 1R 2.1 1.4 1.7 ‐3.1 07:42
1B 1R 1.9 1.4 1.9 ‐3.3
1B 1R 1.7 1.4 2.1 ‐3.5
1B 1R 1.5 1.4 2.3 ‐3.7
1B 1R 1.3 1.4 2.5 ‐3.9
1B 1R 1.1 1.4 2.7 ‐4.1
1B 1R 0.9 1.4 2.9 ‐4.3
1B 1R 0.7 1.4 3.1 ‐4.5 07:45
1B 2R 2.1 2.8 3.1 ‐4.5 07:52
1B 2R 1.9 2.8 3.3 ‐4.7
1B 2R 1.7 2.8 3.5 ‐4.9
1B 2R 1.5 2.8 3.7 ‐5.1
1B 2R 1.3 2.8 3.9 ‐5.3
1B 2R 1.1 2.8 4.1 ‐5.5
1B 2R 0.9 2.8 4.3 ‐5.7
1B 2R 0.7 2.8 4.5 ‐5.9 07:55
1B 3R 2.1 4.2 4.5 ‐5.9 08:04
1B 3R 1.9 4.2 4.7 ‐6.1
1B 3R 1.7 4.2 4.9 ‐6.3
1B 3R 1.5 4.2 5.1 ‐6.5
1B 3R 1.3 4.2 5.3 ‐6.7
1B 3R 1.1 4.2 5.5 ‐6.9 08:06
1B 3R 0.9 4.2 5.7 ‐7.1
1B 3R 0.7 4.2 5.9 ‐7.3 08:09
Nil resistance on feed
Nil resistance on feed
Nil resistance on feed
Slight resistance on feed
Final Drill depth
Nil resistance on the feed
DATE 18‐Aug‐17 DIVER DEPTH 3.4LAT
TIME START 07:34 TIDE 2.0
REQUESTED LAT
DEPTHREQUIRED DRILL DEPTH BSB
FINAL DRILL DEPTH
BELOW SEABED
SUBSEA COMMENTS TOPSIDE COMMENTS
COORDINATES21° 38.195
Tide Ref ‐ Austides 2017 ‐ Onslow115° 08.009
CLIENT / PROJECT OMSB / MARITIME CONSTRUCTION DRILL SITE No. DL07 DIVER
J.Hayes
‐0.8
‐7.0 6.2 7.3FINAL
LAT‐8.1
CountMast
Marker
Rod
LengthDepth LAT RUN TIME
1B 2.4 0 0.0 ‐0.8 10:58
1B 2.2 0 0.2 ‐1.0
1B 2.0 0 0.4 ‐1.2
1B 1.8 0 0.6 ‐1.4
1B 1.6 0 0.8 ‐1.6
1B 1.4 0 1.0 ‐1.8
1B 1.2 0 1.2 ‐2.0
1B 1.0 0 1.4 ‐2.2
1B 0.8 0 1.6 ‐2.4
1B 0.7 0 1.7 ‐2.5 11:00
1B 1R 2.1 1.4 1.7 ‐2.5 11:05
1B 1R 1.9 1.4 1.9 ‐2.7
1B 1R 1.7 1.4 2.1 ‐2.9
1B 1R 1.5 1.4 2.3 ‐3.1
1B 1R 1.3 1.4 2.5 ‐3.3
1B 1R 1.1 1.4 2.7 ‐3.5
1B 1R 0.9 1.4 2.9 ‐3.7
1B 1R 0.7 1.4 3.1 ‐3.9 11:07
1B 2R 2.1 2.8 3.1 ‐3.9 11:15
1B 2R 1.9 2.8 3.3 ‐4.1
1B 2R 1.7 2.8 3.5 ‐4.3
1B 2R 1.5 2.8 3.7 ‐4.5
1B 2R 1.3 2.8 3.9 ‐4.7
1B 2R 1.1 2.8 4.1 ‐4.9
1B 2R 0.9 2.8 4.3 ‐5.1
1B 2R 0.7 2.8 4.5 ‐5.3 11:15
1B 3R 2.1 4.2 4.5 ‐5.3 11:23
1B 3R 1.9 4.2 4.7 ‐5.5
1B 3R 1.7 4.2 4.9 ‐5.7
1B 3R 1.5 4.2 5.1 ‐5.9
1B 3R 1.3 4.2 5.3 ‐6.1
1B 3R 1.1 4.2 5.5 ‐6.3
1B 3R 0.9 4.2 5.7 ‐6.5
1B 3R 0.7 4.2 5.9 ‐6.7 11:24
1B 4R 2.1 5.6 5.9 ‐6.7 11:31
1B 4R 1.9 5.6 6.1 ‐6.9
1B 4R 1.7 5.6 6.3 ‐7.1
1B 4R 1.5 5.6 6.5 ‐7.3
1B 4R 1.3 5.6 6.7 ‐7.5
1B 4R 1.1 5.6 6.9 ‐7.7
1B 4R 0.9 5.6 7.1 ‐7.9
1B 4R 0.7 5.6 7.3 ‐8.1 11:41
slight resistance on the feed
DATE 18‐Aug‐17 DIVER DEPTH 2.0LAT
TIME START 10:58 TIDE 1.2
REQUESTED LAT
DEPTHREQUIRED DRILL DEPTH BSB
FINAL DRILL DEPTH
BELOW SEABED
SUBSEA COMMENTS TOPSIDE COMMENTS
COORDINATES21° 38.381
Tide Ref ‐ Austides 2017 ‐ Onslow115° 07.974
CLIENT / PROJECT OMSB / MARITIME CONSTRUCTION DRILL SITE No. DL08 DIVER
T.Whitham
‐2.3
‐7.0 4.7 5.9FINAL
LAT‐8.2
CountMast
Marker
Rod
LengthDepth LAT RUN TIME
1B 2.4 0 0.0 ‐2.3 14:25
1B 2.2 0 0.2 ‐2.5
1B 2.0 0 0.4 ‐2.7
1B 1.8 0 0.6 ‐2.9
1B 1.6 0 0.8 ‐3.1
1B 1.4 0 1.0 ‐3.3
1B 1.2 0 1.2 ‐3.5
1B 1.0 0 1.4 ‐3.7
1B 0.8 0 1.6 ‐3.9
1B 0.7 0 1.7 ‐4.0 14:26
1B 1R 2.1 1.4 1.7 ‐4.0 14:31
1B 1R 1.9 1.4 1.9 ‐4.2
1B 1R 1.7 1.4 2.1 ‐4.4
1B 1R 1.5 1.4 2.3 ‐4.6
1B 1R 1.3 1.4 2.5 ‐4.8
1B 1R 1.1 1.4 2.7 ‐5.0
1B 1R 0.9 1.4 2.9 ‐5.2
1B 1R 0.7 1.4 3.1 ‐5.4 14:37
1B 2R 2.1 2.8 3.1 ‐5.4 14:50
1B 2R 1.9 2.8 3.3 ‐5.6
1B 2R 1.7 2.8 3.5 ‐5.8
1B 2R 1.5 2.8 3.7 ‐6.0
1B 2R 1.3 2.8 3.9 ‐6.2
1B 2R 1.1 2.8 4.1 ‐6.4
1B 2R 0.9 2.8 4.3 ‐6.6
1B 2R 0.7 2.8 4.5 ‐6.8 14:54
1B 3R 2.1 4.2 4.5 ‐6.8 15:02
1B 3R 1.9 4.2 4.7 ‐7.0
1B 3R 1.7 4.2 4.9 ‐7.2
1B 3R 1.5 4.2 5.1 ‐7.4
1B 3R 1.3 4.2 5.3 ‐7.6
1B 3R 1.1 4.2 5.5 ‐7.8 15:06
1B 3R 0.9 4.2 5.7 ‐8.0
1B 3R 0.7 4.2 5.9 ‐8.2 15:07
No resistance on feed Handful of small pebbles 20 to 30mm
Slight resistance on the feed Small pebbles 20 to 30mm
No resistance on feed
DATE 17‐Aug‐17 DIVER DEPTH 3.6LAT
TIME START 14:25 TIDE 1.3
REQUESTED LAT
DEPTHREQUIRED DRILL DEPTH BSB
SUBSEA COMMENTS TOPSIDE COMMENTS
CLIENT / PROJECT OMSB / MARITIME CONSTRUCTION DRILL SITE No. DL09 DIVER
COORDINATES21° 38.586
Tide Ref ‐ Austides 2017 ‐ Onslow115° 07.890
FINAL DRILL DEPTH
BELOW SEABED
T.Whitham
1.3
‐7.0 8.3 4.5FINAL
LAT‐3.2
CountMast
Marker
Rod
LengthDepth LAT RUN TIME
1B 2.4 0 0.0 1.3 12:12
1B 2.2 0 0.2 1.1
1B 2.0 0 0.4 0.9
1B 1.8 0 0.6 0.7
1B 1.6 0 0.8 0.5
1B 1.4 0 1.0 0.3
1B 1.2 0 1.2 0.1
1B 1.0 0 1.4 ‐0.1
1B 0.8 0 1.6 ‐0.3
1B 0.7 0 1.7 ‐0.4 12:14
1B 1R 2.1 1.4 1.7 ‐0.4
1B 1R 1.9 1.4 1.9 ‐0.6
1B 1R 1.7 1.4 2.1 ‐0.8
1B 1R 1.5 1.4 2.3 ‐1.0
1B 1R 1.3 1.4 2.5 ‐1.2
1B 1R 1.1 1.4 2.7 ‐1.4
1B 1R 0.9 1.4 2.9 ‐1.6
1B 1R 0.7 1.4 3.1 ‐1.8
1B 2R 2.1 2.8 3.1 ‐1.8 13:30
1B 2R 1.9 2.8 3.3 ‐2.0
1B 2R 1.7 2.8 3.5 ‐2.2
1B 2R 1.5 2.8 3.7 ‐2.4
1B 2R 1.3 2.8 3.9 ‐2.6
1B 2R 1.1 2.8 4.1 ‐2.8
1B 2R 0.9 2.8 4.3 ‐3.0
1B 2R 0.7 2.8 4.5 ‐3.2 13:45
Drilling was slow and choking resistance
on the outer tube which slowed the
rotation
Final depth attained
Drilling was slow and choking resistance
on the outer tube which slowed the
rotation
DATE 15‐Aug‐17 DIVER DEPTHLAT
TIME START 12:12 TIDE
REQUESTED LAT
DEPTHREQUIRED DRILL DEPTH BSB
SUBSEA COMMENTS TOPSIDE COMMENTS
0.2
1.5
CLIENT / PROJECT OMSB / MARITIME CONSTRUCTION DRILL SITE No. DL10 DIVER
COORDINATES21° 38.677
Tide Ref ‐ Austides 2017 ‐ Onslow115° 07.934
FINAL DRILL DEPTH
BELOW SEABED
J Hayes
1.3
‐7.0 8.3 2.5FINAL
LAT‐1.2
CountMast
Marker
Rod
LengthDepth LAT RUN TIME
1B 2.4 0 0.0 1.3
1B 2.2 0 0.2 1.1
1B 2.0 0 0.4 0.9
1B 1.8 0 0.6 0.7
1B 1.6 0 0.8 0.5
1B 1.4 0 1.0 0.3
1B 1.2 0 1.2 0.1
1B 1.0 0 1.4 ‐0.1
1B 0.8 0 1.6 ‐0.3
1B 0.7 0 1.7 ‐0.4 12:14
1B 1R 2.1 1.4 1.7 ‐0.4
1B 1R 1.9 1.4 1.9 ‐0.6
1B 1R 1.7 1.4 2.1 ‐0.8
1B 1R 1.5 1.4 2.3 ‐1.0
1B 1R 1.3 1.4 2.5 ‐1.2
Drilling was slow and choking resistance
on the outer tube which slowed the
rotation
REQUESTED LAT
DEPTHREQUIRED DRILL DEPTH BSB
FINAL DRILL DEPTH
BELOW SEABED
SUBSEA COMMENTS TOPSIDE COMMENTS
Drilling was slow and choking resistance
on the outer tube which slowed the
rotation
Redrill of DL10
DATE 15‐Aug‐17 DIVER DEPTHLAT
TIME START 14:30 TIDE
COORDINATES21° 38.677
Tide Ref ‐ Austides 2017 ‐ Onslow115° 07.934
CLIENT / PROJECT OMSB / MARITIME CONSTRUCTION DRILL SITE No. DL10A DIVER
C.Rutter
‐0.6
‐9.0 8.4 8.7FINAL
LAT‐9.3
CountMast
Marker
Rod
LengthDepth LAT RUN TIME
1B 2.4 0 0.0 ‐0.6 08:31
1B 2.2 0 0.2 ‐0.8
1B 2.0 0 0.4 ‐1.0
1B 1.8 0 0.6 ‐1.2
1B 1.6 0 0.8 ‐1.4
1B 1.4 0 1.0 ‐1.6
1B 1.2 0 1.2 ‐1.8
1B 1.0 0 1.4 ‐2.0
1B 0.8 0 1.6 ‐2.2
1B 0.7 0 1.7 ‐2.3 08:33
1B 1R 2.1 1.4 1.7 ‐2.3 09:03
1B 1R 1.9 1.4 1.9 ‐2.5
1B 1R 1.7 1.4 2.1 ‐2.7
1B 1R 1.5 1.4 2.3 ‐2.9
1B 1R 1.3 1.4 2.5 ‐3.1
1B 1R 1.1 1.4 2.7 ‐3.3
1B 1R 0.9 1.4 2.9 ‐3.5
1B 1R 0.7 1.4 3.1 ‐3.7 09:05
1B 2R 2.1 2.8 3.1 ‐3.7 09:16
1B 2R 1.9 2.8 3.3 ‐3.9
1B 2R 1.7 2.8 3.5 ‐4.1
1B 2R 1.5 2.8 3.7 ‐4.3
1B 2R 1.3 2.8 3.9 ‐4.5
1B 2R 1.1 2.8 4.1 ‐4.7
1B 2R 0.9 2.8 4.3 ‐4.9
1B 2R 0.7 2.8 4.5 ‐5.1 09:22
1B 3R 2.1 4.2 4.5 ‐5.1 09:34
1B 3R 1.9 4.2 4.7 ‐5.3
1B 3R 1.7 4.2 4.9 ‐5.5
1B 3R 1.5 4.2 5.1 ‐5.7
1B 3R 1.3 4.2 5.3 ‐5.9
1B 3R 1.1 4.2 5.5 ‐6.1
1B 3R 0.9 4.2 5.7 ‐6.3
1B 3R 0.7 4.2 5.9 ‐6.5 09:37
1B 4R 2.1 5.6 5.9 ‐6.5 09:45
1B 4R 1.9 5.6 6.1 ‐6.7
1B 4R 1.7 5.6 6.3 ‐6.9
1B 4R 1.5 5.6 6.5 ‐7.1 09:48
1B 4R 1.3 5.6 6.7 ‐7.3
1B 4R 1.1 5.6 6.9 ‐7.5
1B 4R 0.9 5.6 7.1 ‐7.7
1B 4R 0.7 5.6 7.3 ‐7.9 09:55
1B 5R 2.1 7.0 7.3 ‐7.9 10:13
1B 5R 1.9 7.0 7.5 ‐8.1
1B 5R 1.7 7.0 7.7 ‐8.3
1B 5R 1.5 7.0 7.9 ‐8.5
1B 5R 1.3 7.0 8.1 ‐8.7
1B 5R 1.1 7.0 8.3 ‐8.9 10:19
1B 5R 0.9 7.0 8.5 ‐9.1
1B 5R 0.7 7.0 8.7 ‐9.3 10:21
Slight resistance
Nil resistance
DATE 16‐Aug‐17 DIVER DEPTH 1.7LAT
TIME START 08:31 TIDE 1.1
REQUESTED LAT
DEPTHREQUIRED DRILL DEPTH BSB
SUBSEA COMMENTS TOPSIDE COMMENTS
CLIENT / PROJECT OMSB / MARITIME CONSTRUCTION DRILL SITE No. DL11 DIVER
COORDINATES21° 38.663
Tide Ref ‐ Austides 2017 ‐ Onslow115° 07.849
FINAL DRILL DEPTH
BELOW SEABED
D. Mellett
‐3.1
‐9.0 5.9 1.7FINAL
LAT‐4.8
CountMast
Marker
Rod
LengthDepth LAT RUN TIME
1B 2.4 0 0.0 ‐3.1
1B 2.2 0 0.2 ‐3.3
1B 2.0 0 0.4 ‐3.5
1B 1.8 0 0.6 ‐3.7
1B 1.6 0 0.8 ‐3.9
1B 1.4 0 1.0 ‐4.1
1B 1.2 0 1.2 ‐4.3
1B 1.0 0 1.4 ‐4.5
1B 0.8 0 1.6 ‐4.7
1B 0.7 0 1.7 ‐4.8
Barrel stuck
Redo borehole
DATE 17‐Aug‐17 DIVER DEPTHLAT
TIME START 07:35 TIDE
REQUESTED LAT
DEPTHREQUIRED DRILL DEPTH BSB
FINAL DRILL DEPTH
BELOW SEABED
SUBSEA COMMENTS TOPSIDE COMMENTS
COORDINATES21° 38.692
Tide Ref ‐ Austides 2017 ‐ Onslow115° 07.857
CLIENT / PROJECT OMSB / MARITIME CONSTRUCTION DRILL SITE No. DL12 DIVER
S.Franko
‐3.4
‐9.0 5.6 5.9FINAL
LAT‐9.3
CountMast
Marker
Rod
LengthDepth LAT RUN TIME
1B 2.4 0 0.0 ‐3.4 07:35
1B 2.2 0 0.2 ‐3.6
1B 2.0 0 0.4 ‐3.8
1B 1.8 0 0.6 ‐4.0
1B 1.6 0 0.8 ‐4.2 07:40
1B 1.4 0 1.0 ‐4.4 07:46
1B 1.2 0 1.2 ‐4.6
1B 1.0 0 1.4 ‐4.8
1B 0.8 0 1.6 ‐5.0
1B 0.7 0 1.7 ‐5.1 07:55
1B 1R 2.1 1.4 1.7 ‐5.1 08:18
1B 1R 1.9 1.4 1.9 ‐5.3
1B 1R 1.7 1.4 2.1 ‐5.5
1B 1R 1.5 1.4 2.3 ‐5.7 08:19
1B 1R 1.3 1.4 2.5 ‐5.9 08:21
1B 1R 1.1 1.4 2.7 ‐6.1
1B 1R 0.9 1.4 2.9 ‐6.3 08:24
1B 1R 0.7 1.4 3.1 ‐6.5 08:26
1B 2R 2.1 2.8 3.1 ‐6.5 08:39
1B 2R 1.9 2.8 3.3 ‐6.7
1B 2R 1.7 2.8 3.5 ‐6.9
1B 2R 1.5 2.8 3.7 ‐7.1 08:43
1B 2R 1.3 2.8 3.9 ‐7.3
1B 2R 1.1 2.8 4.1 ‐7.5
1B 2R 0.9 2.8 4.3 ‐7.7
1B 2R 0.7 2.8 4.5 ‐7.9 08:48
1B 3R 2.1 4.2 4.5 ‐7.9 09:11
1B 3R 1.9 4.2 4.7 ‐8.1
1B 3R 1.7 4.2 4.9 ‐8.3
1B 3R 1.5 4.2 5.1 ‐8.5
1B 3R 1.3 4.2 5.3 ‐8.7
1B 3R 1.1 4.2 5.5 ‐8.9
1B 3R 0.9 4.2 5.7 ‐9.1 09:27
1B 3R 0.7 4.2 5.9 ‐9.3 09:29
Slight resistance on the feed
Tide Ref ‐ Austides 2017 ‐ Onslow
DIVER
LAT
REQUIRED DRILL DEPTH BSB
17‐Aug‐17
07:35
Slight resistance on the feed
Very little resistance on the feed
TOPSIDE COMMENTS
Redrill of DL12
Recovered core ‐ loose pieces of
coral and shell
No core material recovered
3 small pebbles recovered within
the inner tube
Full core recovered. ‐7.9 to 9.3
LAT. Indications of Calcareous
Sandstone and Calcareous
Claystone. Very weakly cemented
Very little resistance on the feed
CLIENT / PROJECT DRILL SITE No. DL12AOMSB / MARITIME CONSTRUCTION
SUBSEA COMMENTS
COORDINATES
DATE DIVER DEPTH 5.1
TIDE 1.7TIME START
115° 07.857
21° 38.692
FINAL DRILL DEPTH
BELOW SEABED
REQUESTED LAT
DEPTH
Galt Geotechnics Pty Ltd
www.galtgeo.com.au 4/15 Walters Drive OSBORNE PARK WA 6017
ABN: 64 625 054 729
Appendix C: Understanding Your Report
Galt Geotechnics Pty Ltd
www.galtgeo.com.au 4/15 Walters Drive OSBORNE PARK WA 6017
Page | 1 ABN: 64 625 054 729
UNDERSTANDING YOUR REPORT
GALT FORM PMP11 Rev2
1. EXPECTATIONS OF THE REPORT
This document has been prepared to clarify what is and is not provided in your report. It is intended to inform you of what your
realistic expectations of this report should be and how to manage your risks associated with the conditions on site.
Geotechnical engineering and environmental science are less exact than other engineering and scientific disciplines. We include
this information to help you understand where our responsibilities begin and end. You should read and understand this
information. Please contact us if you do not understand the report or this explanation. We have extensive experience in a wide
variety of projects and we can help you to manage your risk.
2. THIS REPORT RELATES TO PROJECT-SPECIFIC CONDITIONS
This report was developed for a unique set of project-specific conditions to meet the needs of the nominated client. It took into
account the following:
the project objectives as we understood them and as described in this report;
the specific site mentioned in this report; and
the current and proposed development at the site.
It should not be used for any purpose other than that indicated in the report. You should not rely on this report if any of the
following conditions apply:
the report was not written for you;
the report was not written for the site specific to your development;
the report was not written for your project (including a development at the correct site but other than that listed in the
report); or
the report was written before significant changes occurred at the site (such as a development or a change in ground
conditions).
You should always inform us of changes in the proposed project (including minor changes) and request an assessment of their
impact.
Where we are not informed of developments relevant to your report, we cannot be held responsible or liable for problems that
may arise as a consequence.
Where design is to be carried out by others using information provided by us, we recommend that we be involved in the design
process by being engaged for consultation with other members of the project team. Furthermore, we recommend that we be able
to review work produced by other members of the project team that relies on information provided in our report.
Form PMP11 Rev2 20 October 2015
Galt Geotechnics Pty Ltd
www.galtgeo.com.au 4/15 Walters Drive OSBORNE PARK WA 6017
Page | 2 ABN: 64 625 054 729
3. SOIL LOGS
Our reports often include logs of intrusive and non-intrusive investigation techniques. These logs are based on our interpretation
of field data and laboratory results. The logs should only be read in conjunction with the report they were issued with and should
not be re-drawn for inclusion in other documents not prepared by us.
4. THIRD PARTY RELIANCE
We have prepared this report for use by the client. This report must be regarded as confidential to the client and the client’s
professional advisors. We do not accept any responsibility for contents of this document from any party other than the nominated
client. We take no responsibility for any damages suffered by a third party because of any decisions or actions they may make
based on this report. Any reliance or decisions made by a third party based on this report are the responsibility of the third party
and not of us.
5. CHANGE IN SUBSURFACE CONDITIONS
The recommendations in this report are based on the ground conditions that existed at the time when the study was undertaken.
Changes in ground conditions can occur in numerous ways including anthropogenic events (such as construction or contaminating
activities on or adjacent to the site) or natural events (such as floods, groundwater fluctuations or earthquakes). We should be
consulted prior to use of this report so that we can comment on its reliability. It is important to note that where ground conditions
have changed, additional sampling, testing or analysis may be required to fully assess the changed conditions.
6. SUBSURFACE CONDITIONS DURING CONSTRUCTION
Practical constraints mean that we cannot know every minute detail about the subsurface conditions at a particular site. We use
professional judgement to form an opinion about the subsurface conditions at the site. Some variation to our evaluated conditions
is likely and significant variation is possible. Accordingly, our report should not be considered as final as it is developed from
professional judgement and opinion.
The most effective means of dealing with unanticipated ground conditions is to engage us for construction support. We can only
finalise our recommendations by observing actual subsurface conditions encountered during construction. We cannot accept
liability for a report’s recommendations if we cannot observe construction.
7. ENVIRONMENTAL AND GEOTECHNICAL ISSUES
Unless specifically mentioned otherwise in our report, environmental considerations are not addressed in geotechnical reports.
Similarly, geotechnical issues are not addressed in environmental reports. The investigation techniques used for geotechnical
investigations can differ from those used for environmental investigations. It is the client’s responsibility to satisfy themselves
that geotechnical and environmental considerations have been taken into account for the site.
O:\Administration\Standard Forms and Documents\PMP11-Rev2 Understanding your Report.docx