inception report supplementary appendix 2 · inception report july 2009 detailed design and...

Kingdom of Cambodia Ministry of Public Works and Transport

ADB LOAN(SF) 2373-CAM: GREATER MEKONG SUBREGION SOUTHERN COASTAL CORRIDOR

PROJECT

Detailed Design and Implementation Services

INCEPTION REPORT Supplementary Appendix 2

Topographical and Geotechnical Surveys Terms of Reference

In Association With

Date July 2009

Reference

Version

Khmer Associates Consulting Engineers Co. Ltd.Key Consultants Cambodia Khmer Consultant Engineering Corporation Ltd. SBK Research and Development, and VIDO Engineering Consultant Co. Ltd

Loan 2373-CAM (SF): GMS Southern Coastal Corridor Project Supplementary Appendix 2 1 Inception Report July 2009

Detailed Design and Implementation Consultant Egis-Bceom International in Association with KACE, KCC, KCEC, SBK R&D and VIDO EC

Topographic Survey For:

NR33 (approximately 16km between the intersection with NR31 in Kampong Trach and the border with Vietnam Proposed Cross Border Facility at Preak Chat (Kampot) Proposed Cross Border Facility at Cham Yeam (Koh Kong)

Description, Summary of Quantities, Responsibilities, Outputs, Equipment, Methodology and Quotation

June 2009 Topographic Survey for NH33 [approximately 16km] and

Proposed Cross Border Facilities at Preak Chat and Cham Yeam



SECTIONSTOBESURVEYED As per the Consultant’s methodology, topographical surveys had to be performed on NR33, from Junction with NR31 to Border with Vietnam [Kampong Trach to Preak Chak], including the Border Facilities area.

SUMMARYOFMAJORQUANTITIESOFSURVEY

Description QuantityWidth of road survey 40m [plus/minus 20m from centerline] except

where otherwise stated as wider in the methodology

Maximum spacing of X Sections 25m [except where narrower as specified in the methodology]

Length of Road survey Approximately 16 km Junction Survey At all junctions, including +/- 150m along

NR31 at junction at start of road order Facility near Vietnamese/Cambodian

Border Survey of additional 6 Ha – location to be advised to surveyor

Cross Border Facility near Thai/Cambodian Border

Survey of additional 4 Ha – location to be advised to surveyor

Permanent bench marks to be established Every 1000m for NR33 3 for each Cross Border Facilities

Photographic record in electronic format Every 50m [both ways] along the roadway using digital camera, labeling each electronic file appropriately to its location

STATEMENTONRESPONSIBILITYANDWHATTHEDESIGNCONSULTANTWILLSUPPLY

- The Consultant will advise the Survey Sub-contractor when he can mobilize for the work.

- The Consultant will supply comments on the survey subcontractor’s draft report within 1 week of its receipt.

- The Consultant’s field surveyor’s job is to “inspect” and “report” on the survey works, and where necessary advise the Surveyor carrying out the work [for the Survey-subcontractor] were deficiencies exist. It is the responsibility of Survey Subcontractor to achieve the required outputs.

STATEMENTONRESPONSIBILITYOFSUB‐CONTRACTOR

AlltransportandlogisticsforthesurveyshallbetheresponsibilityoftheSurveySub‐contractor The survey sub-contractor shall ensure that his insurances for staff and vehicles are in accordance with the requirement of Consultant’s contract with the Cambodian Government. The survey sub-contractor shall employ a suitable “land mine clearance” company to ensure in advance and during the survey that it is safe for topographical survey works to take place.



Liaison with local authorities is the full responsibility of the Survey Sub-contractor.

OUTPUTSREQUIRED The survey work from commencement to draft completion [submission of draft reports and drawings] is to be done in 1 month from order to commence. All reports and drawings are to be completed and submitted within1 week of all Consultant comments. A full topographical survey report shall be prepared [in both paper copy (3 copies) and electronic copy – files in word/excel, and one fully compiled pdf copy] giving full details of the survey, coordinates, leveling and benchmarks. All benchmarks shall be shown in photographs on data sheets. The report shall be submitted in draft by the surveyor, and only finalized after Consultant comments. Survey drawings plus 3D digital terrain model as below are required from the survey-subcontractor: Survey drawings shall be produced in layered AutoCAD format, and computerized files will be generated to create a 3 Dimensional Digital Terrain Model (DTM) [all points in Autocad in x,y,z format, not with the Z=0 format] to be used as input for the road design software. The following scales will be used for topographic drawings: 1/500 scale; Concrete bench marks will be set out for future re-use at construction stage. All details regarding the existing structures, the river bed (longitudinal profile, cross-sections, slopes of the banks, etc.) will be surveyed and plotted on AutoCAD format drawings. The drawing shall be submitted in draft to the Consultant first [in hard and soft copy] and only completed /finalized after Consultant comment. Permanent Bench Marks shall be supplied, installed and located on site by the survey-subcontractor. The shape and form of these shall meet Cambodian standards. Full topographical survey report shall be prepared by the survey-subcontractor. It shall comprise of:-

- List of control points, bench marks and obstacles - Plan drawing of scale 1:1000 with contour line intervals of 0.5m, indicating land usage and the

location and levels of permanent survey stations and benchmarks. - Longitudinal section of horizontal scale 1:1000 and vertical scale 1:500. - Cross sections of scale 1:250. - CD containing raw data of survey (file downloaded from survey equipments), digital terrain

model, photographs, maps and sections

SURVEYEQUIPMENTS The Sub-Contractor for survey will carry out survey using equipment fully capable of achieving the accuracy requirements required and stated in this document.

SURVEYMETHODOLOGY The Consultant proposes to carry out the topographical survey on the identified road sections with highest standards using latest survey equipments. The detailed topographic survey on NR33 between Preak Chak and Kampong Trach will be carried out by the Survey Sub-contractor as follows:

Cross-section surveys at 25 metre intervals (or at shorter interval wherever there is an abrupt change in the terrain) along NR33 in sufficient detail (9 points minimum) to prepare the construction drawings showing the longitudinal profile of the existing



road and to prepare design cross-sections for the contractor’s use and setting out works. Cross-sections may be extended beyond the 40-metre limit when necessary for possible local realignments and side drainages. Accurate site details of all cross drainage structures, and the single lane bailey bridge near the border, physical obstacles for road construction or resettlement within the 40metre limit such as housing, electric posts, big tries etc. will be recorded with proper coding to enable preparation of layout drawings of the existing structures and obstacles needed for the design of road improvement. Establishment of horizontal and vertical control points, bench marks and other references as are required enabling bills of quantities to be estimated within a ±10% accuracy of actual construction quantities. Field surveys will be taken along and in [including invert levels] of drainage channels and rivers within the designated survey area as follow: 40-metre limit (20-metre from both sides of the existing road alignment) except at location such as sharp bend, junction with other roads which require larger limit for geometric design. At existing structures: 100-metre limit for pipe culverts (at least 6 cross-sections) 200-metre limit for box culverts and bridges (at least 8 cross-sections)

The Consultant intends the Survey Sub-contractor to use the codification shown below [see Figure 1], but will consider any adjustment requested by the Survey company to obtain consistency with Cambodia topographic practices. The survey should aim to collect ground points at close intervals to generate an accurate terrain model and also to generate earthwork quantities within the permissible range of ±10%. In order to achieve the above, the Consultant has derived the following methodology [to be used by the survey sub-consultant] for topographical surveys:

o Supply and Establish permanent bench marks (PBM) to Cambodian Standard at every 1 km, and temporary bench marks (TBM) at every approx 500m.

o Carry out horizontal control survey (HCS) a closed traverse (2-5 km loop) connecting

PBMs and TBMs with total station to establish Easting (X) and Northing (Y). The permissible closing error allowed is 1 in 25,000. If the closing error is more than the permissible error as stated above, the particular traverse loop will be repeated. The permissible error will be distributed to all traverse points of the loop according to Bowditch’s rule. The coordinates of the starting PBM will be connected to the National Grid. Each loop should be completed in the same day it is commenced in order to minimize errors. The Consultant should be advised 3 days in advance that traverse is being carried out so that he can arrange for his surveyor to attend.

o Carry out vertical control survey (VCS) a closed leveling (2-5 km loop) connecting

PBMs and TBMs with Auto Level to establish level (Z). The permissible closing error allowed is 6xsqrt(k), where, k is length of loop. The level of the starting PBM will be assumed as 100 and will be connected to the National Grid. Each loop should be completed in the same day it is commenced in order to minimize errors. The Consultant should be advised 3 days in advance that traverse is being carried out so that he can arrange for his surveyor to attend.

o Carry out detailed survey of road to establish terrain model and will cover minimum

number of points required to predict true ground model. For this, cross sections will be taken on 40 m width [plus/minus 20m from existing centerline at intervals of 25m maximum (or shorter interval where there is an abrupt change in terrain] and points on carriageway at intervals of 25m and will include all change points.



o Carry out detail survey of all other features within the 40m wide survey corridor [such

as buildings, fences, utility poles, trees and other obstacles to road design and construction, graves and in fact all items as codified in Figure 1 below. All village names shall be shown on the plan.

o Cary out survey of all drainage structures [existing] crossing the road (approximately

20 number known existing pipe and box culverts (as identified in 2006 inventory as Table 1 attached at end this document, plus any others found under the road and under junction areas), plus one number small bridge (near border) as shown on Photograph 7. Survey to include measurement of size of the existing structures, invert levels, and survey of size and invert levels of approach channels to culverts to distance plus/minus 50m from culverts and plus/minus 150m from bridge.

o Carry out survey of small side road junctions and all features within the survey area

required with existing road to distance 50m from existing road centerline and plus/minus 10m from side road centerline. Sections at 10m intervals maximum.

o Carry out survey at the Junction with NR31 and for all features in the surveyed area

[+/- 150m along NR31 from Junction and in corridor width plus/minus 20m from centerline from 50 to 150m from junction, and at width plus/minus 50m from centerline of NR31 within Plus/minus 50m from junction. Cross section maximum 25m, and grid survey maximum 10m intervals.

o The Consultant will advise the survey subcontractor:

Approximately 6Ha additional area near the border with Vietnam (Preak

Chak) to be surveyed. Survey shall tie fully with the road survey follow the codification and shall pick up all existing features [as codification], slope changes, and drainage channels, within the area. The area shall be covered by ground elevation points maximum 10m from any other point.

Approximately 4Ha additional area near the border with Thailand (Cham Yeam) to be surveyed. Survey shall tie fully with the road survey follow the codification and shall pick up all existing features [as codification], slope changes, and drainage channels, within the area. The area shall be covered by ground elevation points maximum 10m from any other point.



Figure 1:

The survey sub-contractor shall make a photographic record of the project road, taking pictures with a digital camera at 50m intervals [in both directions]. The results [each file] shall be suitably labeled with the location of the photograph.

Some recent photographs of this section of road follow:

Photographs of Start [North End] of the road] to be improved.

P1: View to West of Junction

(note there is a one lane Bailey type bridge close) P2: View to East of NR31 at Junction at start



P4: Typical View Southwards [in rural section] on existing road

P5: Typical View Northwards [in rural section] on existing road

P 6: Orthophoto Plan in vicinity of proposed Border Crossing at Preak Chat [Source: Google Earth, photo base date 2005] Topographical survey is to continue to official border “post”, midway between Cambodian and Vietnamese border facilities

Casino/Hotel now under construction in this area

Official border is now about here, border is limit of survey

Vietnam border crossing facility

Cambodia side of border



Photograph 7: Bridge in CBF Area

Table 1: Drainage structures recorded in 2006 [excluding bridge at border]



P8: Location of proposed CBF at Cham Yeam (Koh Kong)

P9: Panoramic view taken from Thai side toward seaside

P10: Panoramic view toward mountain behind existing CBF

Existing CBF Building (Cambodia)

CBF (Thailand)



Bill of Quantities

Description Unit Unit Ratei Quantities Amount

Road surveyii (NR33) US$/km 16

Safe measures against riskiii of Land mine for road survey

US$/km iv

Cross Border Facility near Vietnamese/Cambodian Border

US$/Ha 6

Cross Border Facility near Thai/Cambodian Border

US$/Ha 4

Safe measures against risk of Land mine for CBFs survey

US$/Ha v

Instant of permanent benchmark

number US$/number 25

Total

i Rates include logistic, equipment, others related work which has not been listed, data processing and report reproduction. ii Include side drainage and water-crossing structures iii The area to be survey might present risk related to land-mine and UXO. The survey sub-contractor have to identify and consult with specialised firm in land-mine clearance to assess the risk and to find area which will require support from demining agent for the safety during field work of topographic survey. The support from demining agent at this topographic survey stage is not to demine the suspected effected area but their input is to provide briefing/short-training to surveyors on safe working procedure and to assist them during field work to ensure that surveyors will only walk on safe-path cleared by demining agent with proper mine-detection equipment. iv Quantities to be advised by survey sub-contract after consultation with certified demining company. v Quantities to be advised by survey sub-contract after consultation with certified demining company.



TERMS OF REFERENCE

MATERIAL SURVEY AND GEOTECHNICAL INVESTIGATION

FOR

NR33 (approximately 16km between the intersection with NR31 in Kampong Trach and the border with Vietnam

Proposed Cross Border Facility at Preak Chat (Kampot)

Proposed Cross Border Facility at Cham Yeam (Koh Kong)

June 2009



1. PROJECT BACK GROUND

The Government of Cambodia (RGC) will implement improvements in the Cambodia section of the GMS Southern Coastal Corridor with funding assistance from the Asian Development Bank (ADB) and the Government of Australia. The GMS Southern Coastal Corridor is a road corridor running along the Gulf of Thailand coast from Bangkok in the north through Thailand, Cambodia and Vietnam to Ca Mau city in the South of Vietnam. The scope of the GMS-SCC project in Cambodia is given in Table 1 below.

Table 1: Scope of the project in Cambodia [as TOR]

Ref. No. Component Description of Works Quantity

1 NR33 Improvement from the bridge in the border neutral zone to the intersection with NR31 in Kampong Trach

Reconstruct and widen existing embankment, construct drainage structures and provide DBST sealing to provide 7m carriageway with 2X15m sealed shoulders. Improve T-junction in Kampong Trach

15.1 km

2 NR33 Bridges between Kampong Trach and Kampot

Replace or widen short bridges and culverts to meet 11m roadway width

22 structures

3 Cross Border FacilitiesPreak Chak (at border with Viet Nam) and Koh Kong (at border with Thailand)

Develop two new cross border facilities comprising customs and immigration, camcontrol and quarantine, administration and staff quarters, parking and circulation roads and utilities

2 @ 4 Ha

4 Road Maintenance Component (i) Periodic maintenance and repair of roadway between Kampong Trach and Kampot, (ii) implementation of routine maintenance program for entire NR33 between Preak Chak and Kampot and NR31 Kampong Trach to junction with NR3

111km

The project in Cambodia will be financed using RGC domestic finance, a loan from ADB, and a grant from the Government of Australia. The Kingdom of Cambodia has received a loan from the Asian Development Bank (ADB) by a loan reference 2373-CAM dated 18 February 2008 and a grant from the Government of Australia for the purpose of financing the GMS Southern Coastal Corridor project. The Ministry of Public Works and Transport (MPWT) is the executing agency for the GMS-SCC project and has engaged a Consultant led by Egis Bceom International to assist in the implementation of the Project. MPWT has appointed Project Management Unit No. 3 (PMU-3) as the Project Implementation Agency (IA).



2. OBJECTIVE OF MATERIAL INVESTIGATION AND GEOTECHNICAL SURVEY

The GMS-SCC Project intends to undertake detailed design for improvement of approximate 16km of NR33 (Ref. No. 1 - Table 1) and Cross Border Facilities (Ref. No. 2 - Table 1). For this purpose, the GMS-SCC Project is desirous of engaging Sub-Contractor who shall provide engineering services on Material Survey and Geotechnical Investigation.

3. SCOPE OF WORK

3.1 GENERAL WORK DESCRIPTION

3.1.1 Detailed Materials and Geo-technical Investigations are to be carried out at the areas of the

project and submission of a detailed Materials Investigation and Geo-technical reports which shall be the basis for the design of road pavement and allied structures, foundations for buildings of Cross Border Facility.

3.1.2 These survey and investigation will collect pertinent information about soils, rock, and

materials needed for design of road pavement and foundation of structure. Field investigations and laboratory testing will be undertaken. Under field investigations, geophysical explorations, test pits, trenching, hand augering, boring, rock and soil sampling, soil profile registration and measurement of ground water level, will be undertaken, as necessary and appropriate. Laboratory testing will involve the testing of representative samples of soils, rock, potential construction materials, and water.

3.1.3 The services to be rendered by the Sub-Contractor shall include, but not necessarily be limited to the following:

- Materials Investigation: The scope includes all necessary work to assess

product performance relating to material utilization on NR33 and CBFs. The purpose of the materials investigation work is to accomplish field investigation, literature review or technical evaluation to determine suitability of material for inclusion or exclusion pertaining to NR33 and to CBFs design and construction. The processes necessary to conduct Materials work may include, but should not be limited to, the following activities:- material source investigation (borrow pit, aggregate pit processing methods, quality verification, quantity, production rate and cost etc.), recommendations on aggregate pit suitability and involvement with maintaining and concluding pit permits, material additive issues (e.g. lime or cement stabilisation), test result variance, material property correlation with test results.

- Geotechnical Survey: The purpose of the Geotechnical Survey is to accomplish field investigation, geotechnical design, in-situ testing, drilling services and laboratory testing services for structural design of road pavement, structural foundations, landslides and rockslides, settlement and ground water problems. The processes necessary to conduct Geotechnical work may include, but should not be limited to the following activities:- Perform laboratory tests, analyze findings and test results, and prepare reports containing problem descriptions and recommendations for solution; provide design for landslides, rockslides, steepened slopes in fill or cut and other highway and building related geotechnical features; prepare design



drawings including geology sheet; perform subsurface drilling, sampling, and testing.

3.1.4 The project areas are:

- Unpaved section of NR33 (approximate 16 kms long) from junction with NR31 to Vietnamese border at Preak Chak

- Cross Border Facility at Preak Chak, Kampot province - Cross Border Facility at Cham Yeam, Koh Kong

3.1.5 The Project Engineer will advise the locations of in-situ borings, test pits, and

other types of in-situ investigations, and will define the type and number of samples and laboratory tests to be carried out, in order to assess the soil characteristics of each homogeneous zone and/or of particular road sections or location of CBFs which may pose specific problems (rock cuts, unsuitable materials, fills over compressible soils, expansive clay soils, slope stability problem areas, etc.).

3.1.6 The work of the Sub-Contractor shall include mobilisation of all necessary equipments, providing necessary engineering supervision and technical personnel, skilled and unskilled labour, etc. as required to carry out the entire field as well as laboratory investigation, analysis and interpretation of data collected and preparation of a Geo-technical report.

3.1.7 The sub-consultant shall ensure that his insurances for staff and vehicles are in

accordance with the requirement of Consultant’s contract with the Cambodian Government.

3.1.8 Liaison with local authorities is the full responsibility of the Sub-Contractor.

3.1.9 The Sub-Contractor shall employ a specialised “land mine clearance” company

to ensure in advance and during the survey to ensure safety of entire work activities.

3.1.10 Items wise list of investigations to be conducted along with approximate estimated quantities are given at Schedule of Quantities against which the sub-consultant shall quote the rates in figures as well in words. However, payment shall be made as per quantities actually executed.

3.1.11 The Sub-Consultant shall carry out all work meant within Para 3.1.1 of this

Scope of Work even if not explicitly mentioned under the scope. All work shall be executed to the satisfaction of the Engineer.



3.2 MATERIALS SURVEY

3.2.1 BORROW (EARTHWORK AND SUB-BASE MATERIALS)

Borrow areas deemed potentially suitable for the extraction of fill and sub-base materials will be investigated. Successful identification of suitable materials will be followed by topographical survey and preparation of location plans for the borrow sites. Borrow materials will be tested in order to ascertain their suitability for the works. The volume of available material will initially be estimated visually. To minimize haulage distances from borrow areas during construction, effort will be expended to identify suitable borrow areas at short distance intervals along the Project road corridor NR33 and CBFs areas. The following laboratory tests will be conducted on selected representative samples, in order to establish suitability for use in the works:

Altterberg limit tests Particle size distribution Organic matter content; Laboratory compaction

California bearing ratio Insitu density and moisture content;– only for alignment subgrade soils; Sand equivalent; and, Free swell.

Note: Table 2: provides an indicative inventory of the main quarries and borrows pits available in the corridor (extracted from Consultant’s Technical Proposal).

3.2.2 QUARRIES (PAVEMENT MATERIAL & CONCRETE STRUCTURE)

The main construction materials required for road construction, road maintenance, concrete structure and CBF buildings will include crushed aggregates (hard stone) for base, cement concrete and asphaltic concrete. An investigation into the availability of these construction materials will be performed to establish the quality and quantity of potential sources. The locations of such materials sources, if identified, will be indicated on the construction materials location plans. In order to improve the control over the use of materials during the construction phase, the Sub-Contractor will identify a number of quarries to be used in priority for materials supply. The following laboratory tests will be carried out on prepared (crushed) samples of rock from quarries and selected rock outcrops, in order to establish the suitability of materials for use in the works:

Flakiness index (BS 812); Specific gravity (BS 812); Aggregate crushing value (BS 812); Los Angeles abrasion (AASHTO T96/ASTM); Sodium sulphate soundness (AASHTO T104); Bitumen affinity; and, Alkali silica reaction (ASR)



3.2.3 CONSTRUCTION WATER

Quality and quantity of water sources will be investigated for the identified locations and additional tests conducted to evaluate their suitability for construction purposes. Consideration will be given to communal water needs, and a classification of water use will be undertaken to assist the Project Engineer in understanding water supply and demand balance, within the communities living along the project road. Based on the findings of the evaluation, the Project Engineer will propose, in consultation with the Client, economical and environmental-friendly construction methods. There is possibility of damming certain seasonal water courses to provide construction water. In this case, the Sub-Contractor will liaise with the Project Engineer (Environmental Specialist) in order to confirm sources of water to be surveyed and included on the construction materials location plans. The following laboratory tests will be carried out on water samples taking for borehole sinking sites or nearby villagers’ wells:-

Alkali silica reaction (ASR); and, Turbidity

3.3 GEOTECHNICAL INVESTIGATION

3.3.1 Earthworks and Sub-grade Investigations

Earthworks and sub-grade investigations will be undertaken on NR33 section between Preak Chak Cross-Border and Kampong Trach. Field density tests will be carried out at one kilometre intervals and samples will be taken to the laboratory for classification, compaction and CBR testing. CBR tests will be carried out on the actual lateritic gravel surface intended to form the sub-grade. At locations where high embankments exist along existing alignments, deeper borings will be performed in order to ascertain the adequacy of the embankment’s state of compaction. Each soil layer will be described according to its thickness, texture, organic content, relative moisture content and degree of compaction. The depth of seepage zones and/or the free water table as well as bedrock elevations, if any, will be recorded wherever encountered. Specific operations will be in respect of: high cut slopes, cases of embankment widening to the existing road formation, and those embankments demonstrating poor compaction. The stability of high cut slopes will be tested on in-situ bases. These tests and investigations will enable the determination of stable gradients for the slopes and the design of possible control devices, such as retaining walls. However, it will also be considered that the existing slopes have demonstrated their stability for several years and this fact can lead to the conclusion that they have reached final stability. Such observations of stable existing slopes may also guide determination of the gradient for proposed new cuts through similar materials. The presence of groundwater will influence the design of drainage ditches and structures. These occurrences will also influence the selection of embankment and borrow material types i.e. less plastic materials will be recommended for such occurrences.

3.3.2 Pavement Strength investigations

The Sub-Contractor will conduct deflection survey using Benkelman Beam or FWD tests to know the strength of the existing pavement. The measurement will be made at an average of 10 points per km. The results will be analyzed in terms of homogeneous sections requiring homogeneous treatments. In addition, the following will be carried out:

1 DCP per 500m; and,



1 test pit (2m deep) each 1km of the road, or at each change of pavement condition or deflection readings. It will allow the consultant to determine information on the existing pavement plus the suitability of the sampled materials for the intended new pavement structure.

33..33..33 Bridge Site investigations

The bridge site investigation consists of reviewing the relevant information available on the existing and projected structures before adopting any such data or analysis in the project. All conclusions and recommendations of these studies will be discussed with Project Engineer to determine their applicability on the current project. At existing bridge foundation and possible / potential new bridge sites, specific test pits and bore holes of up to 4m depth will be dug / drilled in order to develop and record the vertical profile of materials encountered beneath footing bases, and the extent, in terms of depth, of the stable ground layer. Samples will be collected and taken for laboratory testing and to establish allowable foundation bearing pressures and tolerable scouring depths. Riverbed materials will be sampled and their particle size distributions determined for use in calculating allowable scour depths at each bridge site. Approximate chainage of existing bridges location: Km 6+750, Km 15+700 (The exact location of bridges will be determined after the topographical survey & the exact number of bridges to be investigated will be identified after the studies of Hydrologist / Hydraulics Engineer.

33..33..44 CBF-Kampot Site investigations

The proposed CBF at Kampot situates at seasonally flooded rice-field next to small stream. The proposed site needs to be raised by 2 to 3 meters height. The in-situ soil is an unconsolidated sedimentary apparently with high organic content. It is important to have extensive assessment of characteristic of surfaced and sub-surfaced soils for appropriate design and construction method of earthwork and time delay when building work can be safely started. The CBF site investigation consists of reviewing the relevant secondary information available from studies/survey conducted previously by past projects which may obtained from Provincial Department of Public Work of Kampot province. All conclusions and recommendations of these studies will be discussed with Project Engineer to determine their applicability on the current project. At proposed location for CBF site, specific test pits and bore holes of up to 4m depth will be dug/drilled in order to develop and record the vertical profile of materials encountered beneath, of the stable ground layer and water-table. Standard Penetrometer Tests will be carried out and samples will be collected and taken for laboratory testing and to establish allowable foundation bearing pressures. In-situ soil materials at surface and at every 1m deep-interval will be sampled for lab testing such as soil classification, and other tests which are necessary for estimating of settlement of earthwork and design of foundation of CBF Buildings.



33..33..55 CBF-KohKong Site investigations

The proposed CBF at Koh Kong is situated at tip of weathered limestone hill. The terrain is steeply inclined toward seaside. The CBF site will require both cut on Noth-Eastern side and fill on South-Western side of the NR48. It is important to have extensive assessment of characteristic of surfaced and sub-surfaced soils/rock for appropriate design and cost estimation of terrain preparation and construction of CBF. The CBF site investigation consists of reviewing the relevant secondary information available from studies/survey conducted previously by various projects in the project area which may obtained from the Provincial Department of Public Work of Koh Kong province. All conclusions and recommendations of these studies will be discussed with Project Engineer to determine their applicability on the current project. At proposed location for CBF site specific test pits and bore holes of up to 4m depth will be dug/drilled in order to develop and record the vertical profile of materials encountered beneath, of the stable ground layer and underground water-table. Standard Penetrometer Tests will be carried out and samples will be collected and taken for laboratory testing to establish allowable foundation bearing pressures, safe slope in cut or fill.

3.3.6 Preventive measure against risk of land-mine and UXO

The area to be surveyed might present risk related to land-mine and UXO. The Sub-Contractor will employ specialised firm in land-mine clearance to assess the risk and to find area which will require support from demining agent for the safety during field work of material investigation and geotechnical survey. The support from demining agent at this design stage is not to demine the suspected effected area; but input from land-mine clearance agent is to provide briefing/short-training to surveyors on safe working procedure and to assist during field work to ensure that surveyors and test equipments will work on safe-area free from land-mine hazard.

4. REPORTS & DOCUMENTS

Sub-Consultant shall submit report both hard and soft copy in original editable formats and final version in PDF format.

The report should provide recommendations on technical suitability and recommendation from geotechnical from point of view for design of NR33 and CBFs. The report shall include, but should not be limited to following:- A general site description including location with reference to existing structures, an

approximate USGS geodetic coordinate and what is currently on the site. A description of the general site geology as described in available geological

mapping. A description on method used for survey and brief note on type of equipment and

procedure followed and type of test run. General description of results of exploration. This should include field observations

where pertinent. Any holes in which undisturbed samples were obtained shall be noted. Soil and rock descriptions shall be included.

Layout of boreholes and location where samples were taken A log of the borings showing graphically the types of soil/rock and their elevations at

each hole.



Photographs of site activities including testing and boring equipment at site, clearly showing the locations of bore holes shall also be enclosed along with the report.

Recommendations regarding type and the depth of foundations for the proposed structures and suggested net safe/allowable bearing capacities.

Input parameters, if any. Comments / discussion on results, including a note on accuracy achieved standard

deviation Field observation if any

5. CODES & STANDARDS All field and laboratory work shall be carried out strictly in accordance with AASHTO, ASTM or BS Standards. In case of conflict, the AASHTO Codes of Practice shall prevail unless otherwise instructed in writing by Project Engineer.



6. BILL OF QUANTITIES

BILL OF QUANTITIES MATERIAL INVESTIGATION AND GEOTECHNICAL SURVEY

Note: 1. The Sub-Consultant shall fill in unit rate and amount against each item in the BOQs. Quantities, rates and prices not quoted in these

BOQs shall be deemed to be included in the rates and prices given against other items of the work. The quantities indicated below are tentative.

2. The quantities indicated in BOQs are tentative and are subject to change as per site conditions. Rates quoted by the Consultants shall be final and will not be changed due to variation in indicated quantities. Provisional Sums included and so designated in the Bill of Quantities shall be expended in whole or in part at the direction and discretion of the Client.

Item No.

Description Remarks Unit Quantity Unit Rate (US$)

Amount (US$)

(A) (B) (C) (D) (E) (F) (G) 1 Mobilization and demobilization LS

2 Materials survey (Borrow for earthwork and sub-grade) - Collect samples for lab testing 6 sources for Kampot, 4

sources for Koh Kong, 3 samples for each material source

No. 30 - Particle size distribution test No. 30 - Organic matter content (Provisional) No. 30 - Sand equivalent No. 30 - Atterberge Limits No. 30 - Modified Proctor and CBR No. 30 - Free swell No. 30

3 Materials survey (Borrow for shoulder and sub-base materials)

- Collect samples for lab testing 3 sources for Kampot, 2 sources for Koh Kong, 3 samples for each material source

No. 15 - Particle size distribution test No. 15 - Organic matter content (Provisional) No. 15 - Sand equivalent No. 15



Item No.


Amount (US$)

(A) (B) (C) (D) (E) (F) (G) - Atterberge Limits No. 15 - Modified Proctor and CBR No. 15 - Free swell No. 15

4 Materials survey: Quarries (Base-course) - Collect samples for lab testing 2 sources for Kampot, 2


No. 12 - Particle size distribution test No. 12 - Organic matter content (Provisional) No. 12 - Sand equivalent No. 12 - Altterberg Limits No. 12 - Modified Proctor and CBR No. 12 - Free swell No. 12

5 Materials survey: Quarries (sealing aggregates) - Collect samples for lab testing 2 sources for Kampot, 2


No. 12 - Particle size distribution test No. 12 - Organic matter content No. 12 - Sand equivalent No. 12

- Flakiness and elongation indices No. 12 - Specific gravity No. 12 - Los Angeles abrasion No. 12 - Sodium sulphate soundness No. 12 - Bitumen affinity (Provisional) No. 12

6 Materials survey: Quarries (cement concrete aggregates) - Collect samples for lab testing 2 sources for Kampot, 2


No. 12 - Particle size distribution test No. 12 - Organic matter content (Provisional) No. 12 - Sand equivalent No. 12

- Uniformity coefficient (Provisional) No. 12



Item No.


Amount (US$)

(A) (B) (C) (D) (E) (F) (G) - Specific gravity (Provisional) No. 12 - Aggregate crushing value (Provisional) No. 12

- Sodium sulphate soundness No. 12

- Alkali silica reaction (Provisional) No. 12

7 Construction Water

Alkali silica reaction (ASR) (Provisional) No. 2

Turbidity (Provisional) No. 2

8 Geotechnical investigation: existing earthwork and sub-grade

Test pit and backfilling with suitable gravel One 500m intervals No. 34

Collect sub-grade sample for lab testing One Km intervals No. 17

Field density test One Km intervals No. 17

Natural water content One per collected sample

No. 17

Particle size distribution test No. 17

Organic matter content (Provisional) No. 17

Sand equivalent No. 17

Altterberg Limits No. 17

Modified Proctor and CBR No. 17

Free swell No. 17

9 Geotechnical investigation: existing gravel surface

Collect gravel surfacing sample for lab testing One Km intervals No. 17

Field density test One Km intervals No. 17

Natural water content One per collected sample

No. 17

Particle size distribution test No. 17

Organic matter content (Provisional) No. 17



Item No.


Amount (US$)

(A) (B) (C) (D) (E) (F) (G) Sand equivalent No. 17

Altterberg Limits No. 17

Modified Proctor and CBR No. 17

Free swell No. 17

10 Pavement Strength investigations

In-situ CBR by DCP (TRL) One per 500m intervals No. 35

Deflection test (Benkelman Beam or FWD) One per 100m intervals No. 160

11 Bridge site investigation

Extract disturb sample and conduct lab test for classification of soil.

~3 bridges, 2 test pits & 3 samples for each pit

No. 18

Standard Penetrometer Test (SPT) ~3 bridges, 2 tests (max 5m deep)

No. 6

12 CBF-Kampot site investigation


3 samples for each test pit

No. 15

Standard Penetrometer Test (SPT) 5 tests (max 5m deep) No. 5

13 CBF-KohKong site investigation


3 samples for each test pit

No. 15

Standard Penetrometer Test (SPT) 5 tests (max 5m deep) No. 5 Boring in soils (other than in rock) (Provisional) (6 test at max 4m deep) M 24 Boring in Rock (Provisional) (6 test at max 4m deep) M 24 Lab test - UCC strength of rock (Provisional) No. 6



Item No.


Amount (US$)

(A) (B) (C) (D) (E) (F) (G) 14 Providing copies of the site investigation/lab test report Each set of all reports

(interim for comment & final version)

No. 3

15 Preventive measure against risk of land-mine and UXO

Material and geotechnical surveys for NR33 including Bailey bridge

LS 1

Materials and geotechnical surveys for CBF at Kompot LS 1 Materials and geotechnical surveys for CBF at KohKong LS 1 Total Amount (US$)

Provisional Sums (US$)

Total Amount less Provisional Sums (US$)

Total Amount in Words: Name, Signature and Seal:



PROJECT MAPS

AND

RECENT PHOTOGRAPHS



Table2: IndicativeInventoryofMainQuarriesandBorrowPitsAvailableintheCorridor(Kampotprovince)No. Type By Road at about KM Position Offset Type of material Specifications Remaks

Q1 Quarry Phnom Cheal NR3 31+000 RHS 20km Base course MDD=2.24, CBR=88, OMC=6.8, PI=5-6, Gradation=OK Still operating

Q2 Quarry Khaek Tom NR3 42+000 RHS 3km Seal aggregate LA=11, FI=19-20, Gradation=OK Still operating

Q3 Quarry Touk Meas NR31 37+900 RHS 4.5kmSeal aggregate / Base course

MDD=2.255, CBR=86, OMC=6.4, LA<40, Gradation=OK Close

Q3 Quarry Kampong Trach NR33 38+000 LHS 1.5kmSeal aggregate / Base course

NO TEST Still operating

P1 Laterite borrowpit NR31 8+900 RHS 11.3kmSub-base / sub-grade

MDD=2.128, CBR=32, OMC=8.38, Gradation=OKWas used for the construction of road 31

P2 Laterite borrowpit NR31 21+450 LHS 0.5kmSub-base / sub-grade




P4 Laterite borrowpit NR31 26+500 RHS 2kmSub-base / sub-grade



MDD=2.115, CBR=77.6, OMC=8.9, Gradation=OKWas used for the construction of road 31

P6 Laterite borrowpit NR33 47+000 LHS 1kmSub-base / sub-grade

NO TEST Had been used before


NO TEST Had been used before


MDD=2.074, CBR=, OMC=11.5, Gradation=OKWas used for the construction of road 33


MDD=2.16, CBR= , OMC=8.83, Gradation=OKWas used for the construction of road 33







Figure 1: INDICATIVE MATERIALS MAP [NR33 and CBF at Preak Chak]

Figure 2: Project Location Map

Recent photographs of NR33 section under the project

CBF at Cham Yeam

CBF at Preak Chak



Photographs of Start [North End] of the road to be improved.

P1: View to West of Junction P2: View to East of NR31 at Junction at start

P3: Typical View Southwards [in rural section] on existing road

P4: Typical View Northwards [in rural section] on existing road

Photograph 5: Bridge in CBF Area



Cross Border Facility at Preak Chak – Kampot

Figure 3: Orthophoto Plan in vicinity of proposed Border Crossing at Preak Chat [Source: Google Earth, photo base date 2005] Topographical survey is to continue to official border “post”, midway between Cambodian and Vietnamese border facilities

Photograph 6: Building works ongoing in vicinity where CBF was contemplated.

Photograph 7: Land on other side road from building works

Casino/Hotel now under construction in this area

Official border is now about here, border is limit of survey

Vietnam border crossing facility

Current Cambodian CBF

Proposed CBF location



Cross Border at Cham Yeam (Koh Kong)

Figure 4: Orthophoto Plan in vicinity of proposed Border Crossing at Cham Yeam, KohKong

[Source: Google Earth, photo base date 2005]

P9: Panoramic view taken from Thai side toward seaside

P10: Panoramic view toward mountain behind existing CBF

Existing CBF Building (Cambodia)

CBF (Thailand)

Perimeter of proposed CBF (Cambodia)

inception report supplementary appendix 2 · inception report july 2009 detailed design and...

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