metro mining bauxite hills project metro mining
TRANSCRIPT
Environmental Impact Statement
Metro Miningii - Executive Summary
Section 9Water Quality
Metro MiningAppendix K - Environmental Management Plan
Metro Mining Bauxite Hills Project
Supplementary Report to the Environmental Impact Statement
9-1
9 Water Quality
9.1 Introduction
Since the EIS was submitted, three subsequent surface and groundwater monitoring events (May,
June and July 2016) have been completed. This additional information has enabled the calculation
of interim site specific trigger values based on reference data for most parameters of interest, as per
the preferred method for the protection of HEV systems as outlined by the QWQG. This represents
a shift away from relying on AWQG default triggers to applying the QWQG based framework to
assess change in the environment from reference conditions. This evolution in available data has
also allowed the regulatory and environmental impact assessment framework to be revised both in
the selection of sites and analytical suite.
This supplementary submission aims to describe the key changes in the proposed framework for
environmental protection and to address the key concerns raised by EHP commentary. The
following elements of the proposed monitoring framework are discussed:
Summary of changes;
Water type classification;
Release and impact monitoring points; and
Generation of interim water quality objectives.
Appendix A includes the full details of all submissions received for the Project.
9.2 Summary of Changes
The key changes in the monitoring framework presented for surface and groundwater as amended
since the EIS submission are summarised in Table 9-1. The basis for these changes are further
explained in the sub-sections below.
The EIS contained a dataset comprising Project derived site specific data in addition to regional
water quality data associated with other Projects. This dataset formed the basis for the water quality
analysis in the EIS. Since the release of the EIS three further sampling events were undertaken. A
review of the revised water quality dataset, which incorporated the three additional rounds of data,
against descriptions of natural conditions was undertaken. Although there was shift in some
statistical means it was assessed that the additional data has not materially changed the assessment
of background conditions as described in Chapter 9 of the EIS.
The revised assessment is considered more reflective of site specific conditions.
Table 9-1 Summary of changes in monitoring framework
Element EIS Framework Supplementary Report Framework
Relocation of Project infrastructure
Assumed standalone project with no
share infrastructure components with
the SRBP
Assumes use of the SRBP MIA, BLF,
RoRo, main haul road and
accommodation facilities, in addition
to the relocation of the BH1 haul road
to avoid HES wetlands.
Surface Water Monitoring Basis of assessment criteria
predominantly AWQG
Basis of assessment criteria
predominantly reference conditions
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-2
Element EIS Framework Supplementary Report Framework
Extensive monitoring suite Monitoring suite relevant to risk
Defined surface water monitoring points for (REMP): Freshwater; Marine water; and Estuarine.
Defined surface water environmental monitoring points (REMP): Freshwater; Upper Estuary; and Lower Estuary.
Not nominated within the EIS.
Defined surface water release and reference monitoring points: Barge Loading Area sediment
ponds; and Upper Estuary impact and reference
monitoring points.
Groundwater Monitoring
Basis of assessment criteria
predominantly AWQG
Basis of assessment criteria
predominantly reference conditions
with additional risk-relevant
parameters
Extensive monitoring suite
Impact and reference sites established
for treated effluent irrigation and port
loading bay areas
Defined surface water monitoring
points for (REMP)
REMP reference criteria developed
and monitoring suite rationalised
based on risk
9.3 Cooperative Surface Water Monitoring System
The decision to utilize the approved SRBP MIA, BLF, RoRo main haul road and accommodation
facilities provides the opportunity for the design and implementation of a cooperative surface water
monitoring program. The following sections have been written on the basis that a cooperative
arrangement to undertake surface water monitoring addressing the requirements of both project
approvals and EA conditions will ultimately be established.
9.4 Water Type Classification
Four water types have been classified for the purposes of the revised monitoring framework; upper
estuary, lower estuary, freshwater and groundwater. The separation of estuary sites between upper
and lower estuary was determined by assessment of salinity and geomorphic location (i.e. stream
width and location to main river channel). Freshwater reference sites were selected based on
salinity range. Statistical analysis of variance between the grouped freshwater sites indicates the
differences are not significant and are suitable for the grouped assessment applied. Further
refinement of water types may be undertaken following additional sampling to include water
quality criteria specific to freshwater wetlands (such as nutrients and EC).
Post EIS approval surface water and groundwater monitoring programs are discussed in Sections
9.7.5 and 9.7.6 of the Supplementary Report, respectively.
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-3
9.5 Characterisation of Background Water Quality
9.5.1 Freshwater and Marine Water
A broad characterisation of regional water quality using a range of Project site specific data in
addition to data collected from combined regional operations and sites is at Section 9.5.6 of the EIS.
The Project site specific data includes data obtained for the Project, in addition to data obtained for
the SRBP. Regional data includes water quality data obtained from the Pisolite Hills Project, Amrun
EIS and DNRM Dulhunty gauge station. With the additional site specific data now available and
reclassification of water types, this characterisation of background condition can be refined. A
comparison of the changes for key parameters, in addition to the EIS framework data and additional
recent sampling events data is presented in Table 9-2.
Site specific conditions for freshwater were for the most part similar to regional conditions although
EC and turbidity were an order of magnitude higher. The regional freshwater dataset was
dominated by sites within Namaleta Creek which is a larger freshwater system than sites
represented in the site specific freshwater dataset and accounts for the variability in EC and
turbidity. Conditions for estuarine environments were more variable with turbidity and EC reported
at lower levels for the revised site specific dataset in comparison to the regionally derived dataset
whilst nutrients (particularly phosphorus) are higher. It is likely that a degree of variation between
site characterisation can be attributed to the increase in dataset used in the site specific
characterisation (for example site specific dataset refers to 33 data points for EC whilst the regional
dataset refers to 16).
Table 9-2 Water quality characteristics for freshwater and marine water presented for regional (EIS) and site-specific (sup) databases
Water Type Parameter Unit Regional Site Specific Comments
Mean 80th Mean 80th
Freshwater Electrical
Conductivity
µS/cm
53.1 51.9 267.7 715
Site Specific
conditions
elevated to
regional sites
pH Unit 5.3 5.9 6.0 6.5 -
Turbidity NTU
4.3 5.4 32.6 60.4
Site Specific
conditions
elevated to
regional sites
Total Phosphorus mg/L 0.03 0.02 0.03 0.01 -
Total Nitrogen mg/L 0.34 0.39 0.36 0.38 -
Aluminium µg/L 91.4 130.0 70.8 140.0 -
Zinc µg/L 5.8 6.0 7.1 8.0 -
Copper µg/L 1.4 1.8 2.0 2.0 -
Estuarine
(combined
upper and lower
sites)
Electrical
Conductivity
µS/cm
52,358 62,360 40,583 52,620
Lower EC
reported for
site specific
environments
pH Unit 7.7 8.3 7.7 8.0 -
Turbidity NTU
11.0 28.6 9.0 16.0
Lower turbidity
reported for
site specific
environments
Total Phosphorus mg/L
0.05 0.06 0.68 0.49
A substantially
higher range
reported for
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-4
Water Type Parameter Unit Regional Site Specific Comments
Mean 80th Mean 80th
site specific
environments
Total Nitrogen mg/L
0.55 0.60 0.55 1.00
Slightly
elevated
values
reported for
site specific
environments
Aluminium µg/L
107.9 60.0 44.2 50.0
Lower values
reported for
site specific
environments
Zinc µg/L 15.9 25.0 20.6 25.0 -
Copper µg/L
5.4 14.2 5.1 5.0
Slightly lower
values
reported for
site specific
environments
9.5.2 Groundwater
The concentrations of total dissolved solids in groundwater samples collected since February 2016
were within the range of values detected in the previous sampling rounds. Major ion concentrations
were generally within the range of values previously detected except for bicarbonate alkalinity (121
mg/L detected in BH6-MB2-S in May 2016, compared to the previous maximum of 50 mg/L).
The concentrations of dissolved chromium and manganese were found to be marginally higher than
the maximum concentrations previously detected (0.004 and 0.57 mg/L respectively, compared to
the previous maximum of 0.003 and 0.29 mg/L respectively). Additional metals have been analysed
including barium, beryllium, boron, cobalt and vanadium with minimum concentrations below
laboratory detection limits and maximum concentrations of 0.019 mg/L, 0.001 mg/L, 0.3 mg/L,
0.005 mg/L and 0.01 mg/L, respectively.
An elevated concentration of total nitrogen (121 mg/L) was detected in BH6-MB2-S in May 2016,
above the previously detected maximum of 15.3 mg/L, noting this is the same bore where an
anomalously high concentration of bicarbonate alkalinity was detected. As BH6-MB2-S has only
contained sufficient water to be sampled on two occasions (March 2015 and May 2016), it is not
clear if the result is an anomaly. However, it is noted that the ionic balance of the sample is outside
of the acceptable range and the laboratory was unable to identify the cause of this (refer to the
laboratory certificate EB1612196 presented in Appendix G).
The total phosphorus concentrations are within the range of values previously detected.
9.6 Release and Impact Monitoring Points
The Bauxite Hills Project will utilize the approved SRBP MIA and BLF for the stockpiling and barge
loading operations. The original proposed MIA for the standalone project is no longer required and
consequently the two sediment ponds originally proposed at the MIA and associated release points
are no longer relevant. The SRBP EA conditions for release and impact monitoring will be utilized
for the Bauxite Hills Project.
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-5
Similarly, groundwater impact monitoring sites that were nominated upstream and downstream of
the MIA are no longer required. Monitoring sites for the irrigation of treated effluent site are also
now not required given a separate accommodation camp for the Bauxite Hills project is no longer
required as the approved SRBP accommodation facilities will be used for the Bauxite Hills Project.
9.7 Generation of Interim Water Quality Objectives
9.7.1 Water Type Classification
Three water classifications have been defined for the amalgamation of similar water data sites to
generate the trigger values. These water classifications are; freshwater, upper estuary and lower
estuary.
The classifications are based on the physical nature of the sample-site water bodies, which affects
processes such as flushing and residence times as well as key chemical characteristics including
electrical conductivity.
The average electrical conductivity for twelve surface water sampling sites that form the surface
water database for the site are shown at Figure 9-1.
Sites SW01, SW03 and SW04 were grouped and defined as “freshwater” based on their clearly
distinguished low electrical conductivity (<752 µS/cm) and locations being ephemeral surface
water streams.
Site SW05 was not included in the groupings due to its location high in the Skardon River estuary
where it is considered a transitional location between upstream freshwater inputs (average
electrical conductivity of 24,482 µS/cm) and the tidal environment.
Sites W6, W1, W2, W7, W3 and SW02 were grouped together and defined as “upper estuary” based
on their electrical conductivity (range of 32,343-45,274 µS/cm) and location within the Skardon
River estuary (i.e. branch off the main channel) which, due to tidal, flushing and catchment inputs
contributes to similar water quality characteristics.
Sites W4 and W5 were grouped together and defined as “lower estuary” based on their electrical
conductivity (range of 48,599-49,137 µS/cm) and location within the Skardon River estuary (i.e.
within the main channel) that would likewise result in characteristics different to those within the
more tidally constrained upstream branches.
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-6
Figure 9-1 Average electrical conductivity at the surface water sampling sites
9.7.2 Number of Sites and Sample Used to Establish Reference Conditions
The use of environmental reference sites to derive percentile based site specific trigger values for
compliance monitoring and guidelines to monitor changes from background conditions (rather than
generic guidelines defined under ANZECC/ARMCANZ) introduces a number of variables that need
to be considered and managed. The QWQG discuss the need to manage natural variability over time
and between sites. To manage this the QWQG provide some guidance regarding the number of sites
and the number of samples used to assess reference condition. The Guidelines state that “errors in
percentile estimates will reduce with increasing sample size” and recommend “that at least two (and
preferably more) reference sites are used to derive guidelines for each water type”. Where an
extensive data set is not available (typical for background monitoring programs such as this one),
the percentile estimates based on site specific data would give rise to more stringent compliance
criteria and environmental guidelines for monitoring change. The Guideline further states
“percentile estimates based on eight or more samples could be used to derive interim guidelines on
the understanding that further data would be collected and guideline values updated accordingly.”
The database used to characterise the two release-receiving water types (i.e. upper estuary and
groundwater) is currently sufficient (i.e. greater than two sites used and eight reference points) to
establish interim reference criteria for the 20th, 50th and 80th percentiles for the majority of
parameters of interest. A summary of the number of sites and number of samples available for the
assessment of reference conditions for each of the defined water types is presented at Table 9-3. All
sampling locations are shown in Figure 9-2 for surface waters and Figure 9-3 for groundwater.
The surface water locations listed under site names reflect the location identifiers used in the water
quality assessments to date. The identifiers shown in brackets reflect the identifiers that will be used
by Metro Mining as part of the ongoing surface water quality monitoring for the Project. The
monitoring program has been rationalised resulting in some of the sites no longer proposed for
monitoring as part of the surface water quality monitoring for the Project.
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-7
Table 9-3 Summary of database criteria available to characterise the environment
Water Type
Site Identifier
(Supplementary Report
Identifier)
Number of Sites Average Number of Samples1
Upper Estuary
SW02 (W6)
8 14
SW05
W1
W2
W3 (W3)
Lower Estuary W4 (W4)
2 6 W5 (W5)
Freshwater
SW01 (W2)
3 8 SW03 (W7)
SW04 (W1)
Groundwater
BH1_MB1_D (MB-1)
8 26
BH1_MB2_D (MB -2)
BH1_MB3_D (MB-3)
BH6_MB01_D (MB-5)
BH6_MB01_S (MB-5)
BH6_MB02_D (MB-6)
BH6_MB02_S (MB-6)
BH6_MB03_D (MB-4)
S1
S9
S6
W5
W4
W3
W2
W1
S10
AQ01
AQ02
AQ03
SW03
SW02
SP01
SW01
SKARDON RIVER
NA
MALETA CREE K
NAMALETA CREEK
605000
605000
610000
610000
615000
615000
620000
620000
625000
625000
630000
630000
86
90
00
0
86
90
00
0
86
95
00
0
86
95
00
0
87
00
00
0
87
00
00
0
DATE
DISCLAIMERCDM Smith has endeavoured to ensure accuracy
and completeness of the data. CDM Smith assumes no legal liability or responsibility for any decisions or actions resulting from the information contained
within this map.
GCS GDA 1994 MGA Zone 54
0 1,000 2,000500
Metres
Figure 9-2
urface water sampling locations
©COPYRIGHT CDM SMITHThis drawing is confidential and shall only be used
for the purpose of this project.
APPROVED
DRAWN
19/12/16
CHECKED
Legend
Surface Water Sampling Location
Major watercourse
Minor watercourse
Bauxite Hills Project Infrastructure
Skardon River Bauxite Project Infrastructure
DATA SOURCEMEC Mining;
QLD Government Open Source Data;Australian Hydrological Geospatial Fabric
(Geofabric) PRODUCT SUITE V2.1.1 DRG Ref: BES160276-011 R2_surface water sampling
DESIGNER CLIENT
1:72,657Scale @ A3 -
-DESIGNED
CHECKED -
MD
MD
-
R Details Date
21/10/15
1
Notes:
2
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F:\1_PROJECTS\BES160276_Bauxite_Hill\GIS\DATA\MXD\FINAL\SEIS Low Impact Stand Alone Scenario\BES160276-011 R2_surface water sampling.mxd
For Information Purposes
Updated Pit Extents
-
-
-
-
15/07/15
18/10/163 Updated Haul Roads & Infrastructure
Skardon RiverBauxite Project
Airport Strip
Bauxite Hills Project Haul Road Easement
BH6 West MLA boundary
(ML 20689)
Skardon RiverBauxite Project
AccommodationCamp
BH6 EastMLA boundary
(ML 20688)
BH1 MLA boundary(ML 20676)
Skardon River Bauxite Project Haul Road
Bauxite Hills ProjectHaul Road BH6 to BH1
Bauxite Hills ProjectFixed Tide Gauge
Bauxite Hills ProjectCyclone Moorings
Skardon RiverBauxite Project
Mine Infrastructure Area,Port and Barge
Loading Facility
4 14/10/16
GMB6
GMB5
GMB4
GMB3
GMB2
GMB1
AKP01
AKM26
BH6-MB3SBH6-MB3D
BH6-MB2SBH6-MB2D
BH6-MB1SBH6-MB1D
BH1-MB3SBH1-MB3D BH1-MB2S
BH1-MB2D
BH1-MB1SBH1-MB1D
SKARDONRIVE
R
NA
MALETA CREEK
SKARDON R IVE R
NAMALETACREEK
605000
605000
610000
610000
615000
615000
620000
620000
625000
62500086
85
00
0
86
85
00
0
86
90
00
0
86
90
00
0
86
95
00
0
86
95
00
0
87
00
00
0
87
00
00
0
DATE
DISCLAIMERCDM Smith has endeavoured to ensure accuracy
and completeness of the data. CDM Smith assumes no legal liability or responsibility for any decisions or actions resulting from the information contained
within this map.
GCS GDA 1994 MGA Zone 54
0 1,000 2,000500
Metres
Figure 9-3
Baseline groundwater monitoring bores
©COPYRIGHT CDM SMITHThis drawing is confidential and shall only be used
for the purpose of this project.
APPROVED
DRAWN
19/12/16
CHECKED
Legend
Skardon River Bauxite Project baseline monitoring bore
Bauxite Hills baseline monitoring bore
Bauxite Hills Project Infrastructure
Skardon River Bauxite Project Infrastructure
Watercourse
Wetland Class
Estuarine
Palustrine
Riverine
DATA SOURCEMEC Mining 2016;
QLD Government Open Source Data;Australian Hydrological Geospatial Fabric
(Geofabric) PRODUCT SUITE V2.1.1 DRG Ref: BES160276-012 R1_groundwater monitoring bores
DESIGNER CLIENT
1:70,000Scale @ A3 -
MIDESIGNED
CHECKED MI
MD
MD
27/07/16
R Details Date
15/07/151
Notes:
2
3
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F:\1_PROJECTS\BES160276_Bauxite_Hill\GIS\DATA\MXD\FINAL\SEIS Low Impact Stand Alone Scenario\BES160276-012 R1_groundwater monitoring bores.mxd
For Approval
Updated Pit Extents
Final
-
-
21/10/15
27/07/16
Updated Haul Roads and Port Area
5 Updated Haul Roads and Infrastructure 7/12/16
Skardon RiverBauxite Project
Airport Strip
Bauxite Hills Project Haul Road Easement
BH6 West MLA boundary
(ML 20689)
Skardon RiverBauxite Project
AccommodationCamp
BH6 EastMLA boundary
(ML 20688)
BH1 MLA boundary(ML 20676)
Skardon River Bauxite Project Haul Road
Bauxite Hills ProjectHaul Road BH6 to BH1
Bauxite Hills ProjectFixed Tide Gauge
Bauxite Hills ProjectCyclone Moorings
Skardon RiverBauxite Project
Mine Infrastructure Area,Port and Barge
Loading Facility
BigFootprintSwamp
Lynette Swamp
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-10
9.7.3 Interim Guideline Values
Based on the data available, interim guideline values that allow assessment of change in receiving
waters for the majority of parameters of interest have been calculated for groundwater that has
potential to receive water via irrigation of treated effluent. Values to assess change in receiving
water from the MIA will be in accordance with those proposed and approval for the SRBP.
Note that for the statistical analysis to generate the percentile values where a data point was
reported as less than (<) the Limit of Reporting (LOR), the LOR figure was used. There is no standard
way to apply results that are below LOR, but in order to utilise all available data sets, this approach
was taken. It is noted that this approach has the potential to bias the analysis towards slightly higher
numbers than are actually the case.
The Receiving Environment Monitoring Program (REMP) reference criteria for freshwater, upper
estuary and lower estuary are presented in Table 9-4, Table 9-5 and Table 9-6 respectively. Where
sufficient data is available (i.e. minimum of 8 data points), based on the 20th, 50th and 80th percentile
of the existing database. Where sufficient data points are not available, the default criteria for
tropical waters presented in the ANZECC ARMCANZ 2000 or other appropriate Guidelines have
been applied. The reference data will be updated progressively as data is added to the database.
The criteria for groundwater discharge from effluent irrigation are outlined in the Supplementary
Report Appendix I, Table 9-8. The analysis suite for discharge compliance is relevant to the risks
associated with treated effluent water.
The REMP suite is based on the existing database as outlined in Table 9-2. TPH would only be
monitored as part of investigations into hydrocarbon spills with their criteria mandated by EHP.
Parameters with reference criteria will be progressively updated as data is added.
9.7.4 Assessment of Change
The criteria outlined for monitoring receiving water are based on site specific data where sufficient
data exists to derive site specific criteria and guidelines. Where insufficient site specific data is
available default criteria and guidelines have been applied as outlined in Section 9.7.3. The
application of site specific criteria and guidelines and default criteria and guideline where required
is consistent with the environmental conditions applied by EHP for the adjacent Gulf Alumina
operations as the receiving environment and nature of operations are essentially the same.
The site specific criteria to assess release quality and impacts or change in the environment, based
on the 20th, 50th and 80th percentile from reference data or other nominated criteria, are shown at
Table 9-4 to Table 9-7.
Where assessment of impact is reported the assessment of change will be aligned with the method
as outlined in the QWQG Section D.2.1.1 ‘A statistical protocol for assessing medium to long term
compliance in HEV waters’.
Table 9-4 Freshwater reference criteria and REMP suite
Combined Reference Sites (SW01, SW03, SW04)
Parameters Units n Mean Median 20th % 50th % 80th %
pH pH 11 6.0 6.0 5.2 6.0 6.5
Redox (ORP) mV 8 128.1 132.7 111.6 132.7 158.0
Dissolved Oxygen (DO) % 10 50.0 50.2 33.2 50.2 75.6
Electrical Conductivity
(EC) µs/cm 11 268 58 28 58 715
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-11
Combined Reference Sites (SW01, SW03, SW04)
Turbidity NTU 8 32.6 16.5 7.5 16.5 60.4
Suspended Solids (SS) mg/L 2 30
(Due to insufficient data default to model mining conditions)
Total Dissolved Solids
(Calc.) mg/L 9 196 35 15 35 495
Total Alkalinity as CaCO3 mg/L 12 4.3 4.5 3.2 4.5 5.0
Ammonia as N µg/L 9 12 10 10 10 10
Nitrite as N µg/L 9 10 10 10 10 10
Nitrate as N µg/L 9 18 10 10 10 10
Nitrite + Nitrate as N µg/L 12 18 10 10 10 10
Total Kjeldahl Nitrogen as
N µg/L 12 350 100 100 100 380
Total Nitrogen as N µg/L 12 358 100 100 100 380
Reactive Phosphorus as P µg/L 9 10 10 10 10 10
Total Phosphorus as P µg/L 12 26 10 10 10 10
Metals (Dissolved)
Aluminium µg/L 12 71 40 20 40 140
Copper µg/L 12 2.0 1.0 1.0 1.0 2.0
Zinc µg/L 11 7.1 7.0 5.0 7.0 8.0
Table 9-5 Upper estuary reference criteria and REMP suite
Combined Reference Sites (SW02, SW05, W1, W2, W3, W4, W6, W7)
Parameters Units n Mean Median 20th % 50th % 80th %
Dissolved Oxygen (DO) % 23 54.1 55.1 46.0 55.1 60.3
Redox (ORP) mV 20 80.0 86.4 52.8 86.4 95.0
pH pH 27 7.3 7.4 7.1 7.4 7.7
Electrical Conductivity (EC) µs/cm 27 38,082 42,618 26,639 42,618 45,100
Turbidity NTU 15 9.7 8.0 5.0 8.0 16.0
Total Alkalinity as CaCO3 mg/L 20 4,837
Chlorophyll a mg/m³ 10 1.0 1.0 1.0 1.0 1.0
Ammonia as N µg/L 20 102.5 70 36 70 144
Nitrite as N µg/L 20 10 10 10 10 10
Nitrate as N µg/L 20 17 10 10 10 20
Nitrite + Nitrate as N µg/L 25 17.6 10 10 10 20
Total Kjeldahl Nitrogen as N µg/L 25 564 500 180 500 1,000
Total Nitrogen as N µg/L 25 564 500 180 500 1,000
Reactive Phosphorus as P µg/L 20 10 10 10 10 10
Total Phosphorus as P µg/L 25 853 50 10 50 954
Metals (Dissolved)
Aluminium µg/L 25 50 50 50 50 50
Copper µg/L 13 5 5 3 5 5
Zinc µg/L 18 20 25 9.4 25 25
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-12
Table 9-6 Lower estuary reference criteria and REMP suite
Combined Reference Sites (W4, W5)
Parameters Units n Mean Median 20th % 50th % 80th %
Dissolved Oxygen (DO) % 90 –120*
6 75.3 75.5 70.2 75.5 80.8
Redox (ORP) mV 8 96.0 91.0 75.3 91.0 119.1
pH pH 8 7.8 8.0 7.7 8.0 8.1
Electrical Conductivity (EC) µs/cm 8 47,840 47,401 45,871 47,401 49,459
Turbidity NTU 4 1 – 20*
Chlorophyll a mg/m³ 4 2*
Ammonia as N µg/L 6 900*
Nitrite + Nitrate as N µg/L 8 10 10 10 10 10
Total Kjeldahl Nitrogen as N µg/L 8 525 500 260 500 800
Total Nitrogen as N µg/L 8 525 500 260 500 800
Reactive Phosphorus as P µg/L 6 5*
Total Phosphorus as P µg/L 8 140 55 32 55 100
Metals (Dissolved)
Aluminium µg/L 8 50 50 50 50 50
Copper µg/L 4 1.0#
Zinc µg/L 4 2.4#
* For tropical estuaries based on AWQG – tropical estuaries is nominated due to insufficient reference data # AWQG for marine 99% trigger is nominated due to insufficient reference data
Table 9-7 Groundwater reference criteria and REMP suite
Combined Reference Sites (BH1_MB1_D, BH1_MB2_D, BH1_MB3_D, BH6_MB01_D, BH6_MB02_D, BH6_MB02_S,
BH6_MB03_D)
Parameters Units n Mean Median 20th % 50th % 80th %
Dissolved Oxygen (DO) % 32 33.1 33.3 21.3 33.3 44.6
Electrical Conductivity (EC) µs/cm 68 283.4 163.6 66.4 163.6 494.4
Redox (ORP) mV 70 158.7 141.8 99.2 141.8 192.6
Temperature 0C 74 29.8 29.5 29.1 29.5 30.4
Turbidity NTU 27 256 82 41 82 746
Field Parameters (Laboratory)
pH pH 67 5.0 4.9 4.5 4.9 5.5
Suspended Solids (SS) mg/L 45 5733 603 58 603 2196
Total Dissolved Solids (Calc.) mg/L 19 136.8 47.0 25.2 47.0 177.4
Alkalinity
Total Alkalinity as CaCO3 mg/L 56 14.5 8.5 3.0 8.5 23.0
Miscellaneous
Sulfate as SO4 mg/L 59 45.5 16.0 1.6 16.0 84.0
Chloride mg/L 59 36.7 16.0 8.2 16.0 57.8
Dissolved Major Cations
Calcium mg/L 59 3.0 1.0 1.0 1.0 6.0
Magnesium mg/L 59 2.5 1.0 1.0 1.0 4.3
Potassium mg/L 59 2.1 1.0 1.0 1.0 3.9
Sodium mg/L 59 37.9 20.0 8.0 20.0 46.8
Ionic Balance
Ionic Balance % 13 7.6 4.5 1.3 4.5 11.8
Total Anions meq/L 58 2.3 1.3 0.5 1.3 3.3
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-13
Combined Reference Sites (BH1_MB1_D, BH1_MB2_D, BH1_MB3_D, BH6_MB01_D, BH6_MB02_D, BH6_MB02_S,
BH6_MB03_D)
Total Cations meq/L 58 2.1 1.1 0.5 1.1 4.0
Metals (Dissolved)
Aluminium µg/L 57 58 53.7 20.0 10.0 20.0
Arsenic µg/L 52 53 1.0 1.0 1.0 1.0
Cadmium µg/L 55 0.1 0.1 0.1 0.1 0.1
Chromium µg/L 53 1.1 1.0 1.0 1.0 1.0
Copper µg/L 57 159.5 19.0 5.4 19.0 144.2
Iron µg/L 57 582.8 50.0 50.0 50.0 466.0
Lead µg/L 55 1.0 1.0 1.0 1.0 1.0
Manganese µg/L 59 85.7 16.0 7.0 16.0 208.4
Nickel µg/L 53 2.7 1.0 1.0 1.0 2.6
Vanadium µg/L 19 10.0 10.0 10.0 10.0 10.0
Zinc µg/L 59 175.4 42.0 19.2 42.0 150.6
Mercury µg/L 53 0.1 0.1 0.1 0.1 0.1
9.7.5 Surface Water Release Points and Monitoring Locations
Surface water release points were originally nominated for the two sediment ponds proposed for
the MIA; however, with the utilisation of the approved SRBP MIA, BLF and RoRo, there are now no
surface water release points proposed for the Bauxite Hills Project. The release points that were
proposed and approved for the SRBP MIA are detailed in Table 9-8.
Table 9-8 - Contaminated water release points, sources and receiving waters as per SRBP draft EA
Release point
(RP)
Easting MGA94,
zone54
Northing MGA94,
zone 54
Contaminated
water source and
location
Monitoring
point
Receiving waters
locations
MIA sediment ponds
S13 616718 8699703 Port sediment pond
1 At release
point Skardon River
S14 616520 8700246 Port sediment 2
The quality of the receiving waters will be monitored by the operator of the combined Projects at
the compliance monitoring locations (see Table 9-9) and in accordance with the compliance
monitoring requirements specified in the SRBP draft EA (see Table 9-10). The actual locations of
these monitoring sites will be confirmed with EHP in accordance with the SRBP EA. Surface water
monitoring points are included in Figure 9-4.
Table 9-9 - Receiving water reference sites and release-influenced monitoring points as per SRBP draft EA
Monitoring points
Easting MGA94, zone 54
Northing MGA94, zone 54
Receiving waters location description
Upstream Reference Monitoring Points
S15 TBA TBA TBA m upstream of the S13 RP
S16 TBA TBA TBA m upstream of the S14 RP
Downstream Reference Monitoring Points
TBA TBA TBA TBA m upstream of the S14 RP
TBA TBA TBA TBA m upstream of the S14 RP
Big Footprint
Swamp
W8 (SW05)
W5
W4
W3
W7 (SW03)
W6 (SW02)
W1 (SW04) W2 (SW01)
S14
S13
SKARDON RIVER
605000
605000
610000
610000
615000
615000
620000
620000
625000
625000
630000
630000
86
90
00
0
86
90
00
0
86
95
00
0
86
95
00
0
87
00
00
0
87
00
00
0
DATE
DISCLAIMERCDM Smith has endeavoured to ensure accuracy
and completeness of the data. CDM Smith assumes no legal liability or responsibility for any decisions or actions resulting from the information contained
within this map.
GCS GDA 1994 MGA Zone 54
0 1,000 2,000500
Metres
Figure -
urface water monitoring points
©COPYRIGHT CDM SMITHThis drawing is confidential and shall only be used
for the purpose of this project.
APPROVED
DRAWN
15/12/16
CHECKED
Legend
Major Watercourse
Minor Watercourse
Big Footprint Swamp
Bauxite Hills Project Infrastructure
Skardon River Bauxite Project Infrastructure
Surface Water Monitoring Locations
Freshwater monitoring point
Lower estuary monitoring point
Upper estuary monitoring point
Collaborative monitoring points
DATA SOURCEMEC Mining;
QLD Government Open Source Data;Australian Hydrological Geospatial Fabric
(Geofabric) PRODUCT SUITE V2.1.1 DRG Ref: BES160276-004 R1_surface water monitoring
DESIGNER CLIENT
1:65,000Scale @ A3 -
-DESIGNED
CHECKED -
MD
MD
-
R Details Date
24/03/15
1
Notes:
2
3
-
-
-
F:\1_PROJECTS\BES160276_Bauxite_Hill\GIS\DATA\MXD\FINAL\SEIS Low Impact Stand Alone Scenario\BES160276-004 R1_surface water monitoring.mxd
For Information Purposes
Updated Pit Extents
Updated reference sites
-
-
-
15/07/15
22/07/16
4 Updated Haul Roads and Infrastructure 18/10/16
Skardon RiverBauxite Project
Airport Strip
Bauxite Hills Project Haul Road Easement
BH6 West MLA boundary
(ML 20689)
Skardon RiverBauxite Project
AccommodationCamp BH6 East
MLA boundary(ML 20688)
BH1 MLA boundary(ML 20676)
Skardon River Bauxite Project Haul Road
Bauxite Hills ProjectHaul Road BH6 to BH1
Bauxite Hills ProjectCyclone Moorings
Skardon RiverBauxite Project
Mine Infrastructure Area,Port and Barge
Loading Facility
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-15
Table 9-10 - Receiving water contaminant limits as per SRBP draft EA
Quality characteristic Unit Limit Monitoring frequency
Skardon River
Turbidity NTU 20 or 80th percentile of reference, whichever is higher.
Daily during release event (the first sample must be taken within two hours of commencement of release)
pH pH Units 20th percentile of reference or 5.0 (minimum) whichever is lower. 80th percentile of reference of 8.5 (maximum), whichever is higher.
Total Suspended Solids mg/L 50 mg/L or 80th percentile of reference, whichever is higher.
Aluminium µg/L 21 µg/L or 80th percentile of reference, whichever is higher.
Surface slicks, visible evidence of oil and grease
No visible film.
In addition to the monitoring program associated with the receiving water release points shown at
Table 9-9, the monitoring points outlined at Table 9-11 and shown at Figure 9-4 will be monitoring
as part of the ongoing water quality monitoring program specific to the Bauxite Hills Project. These
points will be established taking into consideration freshwater, lower estuary and upper estuary
conditions.
Table 9-11 –Surface water monitoring points
Monitoring points
Easting MGA94, zone 54
Northing MGA94, zone 54
Monitoring location description
Freshwater Monitoring Points
W1 (existing site) 620194 8694108 TBA m upstream of the SRBP MIA
W2 (existing site) 622987 8694196 TBA m upstream of the SRBP MIA
W7 (existing site) 613193 8695468 Big Footprint Swamp
Lower Estuary Monitoring Points
W4 (existing site) 614284 8701663 TBA m downstream of the SRBP MIA
W5 (existing site) 610247 8700107 TBA m downstream of the SRBP MIA
Upper Estuary Monitoring Points
W3 (existing site) 617295 8699517 TBA m upstream of the SRBP MIA
W6 (existing site) 616859 8700289 TBA m downstream of the SRBP MIA
W8 (new site) 616414 8692916 TBA m downstream of the SRBP MIA
9.7.6 Groundwater Monitoring Locations
The groundwater monitoring locations and monitoring frequencies are provided in Table 9-12 for
Bauxite Hills specific monitoring activities. The monitoring program associated with the SRBP MIA
and BLF areas are shown at Table 9-13. The monitoring point locations are shown Figure 9-5.
Quality characteristics that will be monitored for under the Project specific and collaborative
monitoring programs are presented in Table 9-14 and Table 9-15.
11 m
AH
D
10 m
AH
D
9 m
AH
D
8 m
AH
D
7 m
AH
D
6 m
AH
D
5 m
AH
D
6 mAHD
5 mAHD
4 mAHD
3 m
AH
D
7 m
AHD
B-MB3
B-MB2
B-MB1
MB-3RMB-2R
MB-1R
MB-4
MB-6
MB-5
MB-3
MB-2
MB-1
MB-9
MB-8
MB-7
MB-6R
MB-4R
SKARDON RIVER
NAM
ALETA CREEK
NAMALETA CREEK
605000
605000
610000
610000
615000
615000
620000
620000
625000
625000
630000
630000
86
90
00
0
86
90
00
0
86
95
00
0
86
95
00
0
87
00
00
0
87
00
00
0
DATE
DISCLAIMERCDM Smith has endeavoured to ensure accuracy
and completeness of the data. CDM Smith assumes no legal liability or responsibility for any decisions or actions resulting from the information contained
within this map.
GCS GDA 1994 MGA Zone 54
0 1,000 2,000500
Metres
Figure -
roundwater monitoring network
©COPYRIGHT CDM SMITHThis drawing is confidential and shall only be used
for the purpose of this project.
APPROVED
DRAWN
12/09/16
CHECKED
Legend
Reference Groundwater Monitoring Bore
Groundwater Monitoring Bore
Collaborative Monitoring Points
Groundwater Contour (Wet season)
Groundwater Contour (Inferred)
Inferred Groundwater Flow Direction
Watercourse
Bauxite Hills Project Infrastructure
Skardon River Bauxite Project Infrastructure
Groundwater Dependence
High potential for GW interaction
Moderate potential for GW interaction
Low potential for GW interaction
DATA SOURCEMEC Mining;
QLD Government Open Source Data;Australian Hydrological Geospatial Fabric
(Geofabric) PRODUCT SUITE V2.1.1 DRG Ref: BES160276-003 R1_groundwater monitoring network
DESIGNER CLIENT
1:70,000Scale @ A3 -
-DESIGNED
CHECKED -
MD
MD
-
R Details Date
16/07/151
Notes:
2
-
-
-
-
F:\1_PROJECTS\BES160276_Bauxite_Hill\GIS\DATA\MXD\FINAL\SEIS Low Impact Stand Alone Scenario\BES160276-003 R1_groundwater monitoring network.mxd
For Information Purposes
Updated Pit Extents
-
-
-
-
12/09/16
3 Updated Haul Road & Infrastructure 19/10/16
G28
G26
G24
G23
G25
G27
G22
CombinedInfrastructureArea
Skardon RiverBauxite Project
Airport Strip
Bauxite Hills Project Haul Road Easement
BH6 West MLA boundary
(ML 20689)
Skardon RiverBauxite Project
AccommodationCamp BH6 East
MLA boundary(ML 20688)
BH1 MLA boundary(ML 20676)
Skardon River Bauxite Project Haul Road
Bauxite Hills ProjectHaul Road BH6 to BH1
Bauxite Hill ProjectFixed Tide Gauge
Bauxite Hills ProjectCyclone Moorings
Skardon RiverBauxite Project
Mine Infrastructure Area,Port and Barge
Loading Facility
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-17
There is a naming discrepancy identified by external parties as to whether the siltstone underlying
the kaolinite clay layer represents the top of the Rolling Downs Formation or a transitional zone
from the Bulimba Formation to the Rolling Downs Formation i.e. weathered zone. For naming
consistency, Metro Mining is referring that all bores will be screened in the Bulimba Formation.
It should be noted that the groundwater monitoring bores shown in Figure 9-5 will not all be
operational simultaneously. Groundwater monitoring bores within the mining pits have been paired
so that as the bores currently located in the pit areas are destroyed due to mining, the paired bore
will be used as the new monitoring location. The paired groundwater bores that will be
incrementally developed over the life of the mine are denoted with an “R” following the bore
identifier (i.e. MB-1 existing bore and MB-1R replacement bore).
Table 9-12 - Groundwater monitoring locations and frequency – Metro Mining specific activities
Monitoring
Point
Location
Description
Easting MGA94 – (Zone 54)
Northing MGA94 – Zone 54)
Aquifer
screened
(mbgl)
Minimum
Monitoring
Frequency
Mining Areas
Reference Bores
B-MB1 To the north between MLA 20689 and the Skardon River
613584 8698541
Bulimba
Formation
(TBA)
Monthly
B-MB2 To the south of MLA 20676 and Irish Creek
620348 8692974
B-MB3 To the east of Lunette Swamp in MLA 20689
612555 8688799
Compliance Bores MB-1 (existing site)
In the eastern section of MLA 20676
622560 8696018
Bulimba
Formation
(TBA)
Monthly
MB-1R (new site)
In the eastern section of MLA 20676
622103 8696234
MB-2 (existing site)
On the southern boundary and outside the mining area in MLA 20676
620413 8694794
MB-2R (new site)
On the southern boundary and outside the mining area in MLA 20676 near Irish Creek
620516 8694638
MB-3 (existing site)
In the western section of MLA 20676
618477 8694972
BM-3R (new site)
On the western boundary and outside the mining area in MLA 20676
617762 8694554
MB-4 (existing site)
Within the northern section of MLA 20688
615201 8692648
MB-4R (new site)
On the eastern boundary and the mining area in MLA 20688 adjacent to a
615483 8691650
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-18
Monitoring
Point
Location
Description
Easting MGA94 – (Zone 54)
Northing MGA94 – Zone 54)
Aquifer
screened
(mbgl)
Minimum
Monitoring
Frequency
tributary of Irish Creek
MB-5 (existing site)
Within the southern section MLA 20689 and outside the mining area
612634 8690544
MB-6 (existing site)
Within the northern section of MLA 20689 near Big Footprint Swamp
613939 8695668
MB-6R (new site)
On the western boundary and outside the mining area in the northern section of MLA 20689 near Big Footprint Swamp
613635 8695487
MB-7 (new site)
Outside the mining area, near the southern boundary of Big Footprint Swamp
618299 8696109
MB-8 (new site)
Outside the mining area, near the western boundary of Big Footprint Swamp
613738 8694284
MB-9 (new site)
Outside the mining area on the northern boundary of MLA 20676
612355 8694736
Table 9-13 - Groundwater monitoring locations and frequency –monitoring at the SRBP MIA as per the SRBP draft EA
Monitoring
Point
Location Description Easting MGA94 – (Zone 54)
Northing MGA94 – Zone 54)
Aquifer
screened
(mbgl)
Minimum
Monitoring
Frequency
Port Infrastructure Area
Reference Bores
G28 Up gradient of all port infrastructure
616543 8699875 TBA Monthly
Compliance Bores G27 Down gradient of
hydrocarbon storage tanks and port infrastructure
616665 8700108 TBA Monthly
Landfill and bioremediation pad
Reference Bores
G22 Up gradient of existing and proposed landfills port infrastructure
616130 8699666 TBA
Monthly
G25 Up gradient of bioremediation pad
616247 8699833 TBA
Compliance Bores
G23 Down gradient of existing landfill; up
616069 8699674 TBA Monthly
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-19
Monitoring
Point
Location Description Easting MGA94 – (Zone 54)
Northing MGA94 – Zone 54)
Aquifer
screened
(mbgl)
Minimum
Monitoring
Frequency
gradient of proposed landfill
G24 Down gradient of existing and proposed landfills
616007 8699683 TBA
G26 Down gradient of bioremediation pad and proposed landfill
616066 8699867 TBA
Table 9-14 - Groundwater contaminant limits proposed by Metro Mining
Quality Characteristic Unit Limit5 Limit Type Minimum Monitoring Frequency
Aluminium2 µg/L 80th percentile of test site <= upper 75% confidence limit of background 80th
percentile
Three consecutive samples
Monthly
Arsenic1,2 µg/L 80th percentile of test site <= upper 75% confidence limit of background 80th percentile
Cadmium1,2 µg/L 80th percentile of test site
<= upper 75% confidence limit of background 80th percentile
Chromium1,2 µg/L 80th percentile of test site
<= upper 75% confidence limit of background 80th percentile
Copper1,2 µg/L 80th percentile of test site <= upper 75% confidence limit of background 80th
percentile
Iron1,2 µg/L 80th percentile of test site
<= upper 75% confidence limit of background 80th
percentile
Lead1,2 µg/L 80th percentile of test site
<= upper 75% confidence limit of background 80th
percentile
Manganese1,2 mg/L 80th percentile of test site <=
upper 75% confidence limit
of background 80th
percentile
Mercury1,2 mg/L 80th percentile of test site <=
upper 75% confidence limit
of background 80th
percentile
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-20
Quality Characteristic Unit Limit5 Limit Type Minimum Monitoring Frequency
Nickel1,2 mg/L 80th percentile of test site <=
upper 75% confidence limit
of background 80th
percentile
Vanadium1,3 mg/L 80th percentile of test site <=
upper 75% confidence limit
of background 80th
percentile
Zinc1,3 µg/L 80th
percentile of test site <= upper 75% confidence limit of background 80th
percentile
Dissolved oxygen Mg/L 80th
percentile of test site <= upper 75% confidence limit of background 80th percentile
pH Max 80th percentile of test site <= upper 75% confidence limit of background 80th
percentile
Min 20th percentile of test site <=
upper 75% confidence limit of background 20th
percentile
Total dissolved solids mg/L 80th percentile of test site <= upper 75% confidence limit of background 80th percentile
Total Nitrogen4 µg/L 80th percentile of test site <= upper 75% confidence limit of background 80th
percentile
Total Phosphorous4 µg/L 80th
percentile of test site <= upper 75% confidence limit of background 80th
percentile
Nitrate4 µg/L 80th
percentile of test site <= upper 75% confidence limit of background 80th percentile
Escherichia coli4 Cfy/100 ml 80th
percentile of test site <= upper 75% confidence limit of background 80th
percentile
Total petroleum hydrocarbons C6 – C91
µg/L 25 µg/L Maximum
Total petroleum hydrocarbons C10 – C361
µg/L 100 µg/L Maximum
Calcium mg/L Monitor for interpretation purposes Monthly
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-21
Quality Characteristic Unit Limit5 Limit Type Minimum Monitoring Frequency
Carbonate/Bicarbonate (CO3/HCO3)
mg/L
Chloride mg/L
Magnesium mg/L
Potassium mg/L
Redox potential mV
Sodium mg/L
Sulphate mg/L
Suspended solids mg/L
Specific conductance µS/cm
1. Routine monitoring of the quality characteristic only applies to the MIA and biosolid pads groundwater monitoring bores specified Table 9-12.
2. To be sampled and measured as dissolved and total. 3. To be sampled as dissolved. 4. Routine monitoring of this quality characteristic only applied to effluent irrigation area and biosolid pads
specified in Table 9-12. 5. The contaminant limits specified in the Table apply to all groundwater.
Table 9-15 - Groundwater trigger values proposed by Metro Mining
Quality Characteristic Unit Groundwater trigger values
Minimum monitoring frequency
20th percentile 50th percentile 80th percentile
Aluminium3 µg/L 10 20 60
Monthly
Arsenic2,3 µg/L 1 1 1
Cadmium2,3 µg/L 0.1 0.1 0. 1
Chromium2,3 µg/L 1 1 1
Copper2,3 µg/L 5.4 19.0 144.2
Iron2,3 µg/L 50 50 466
Lead2,3 µg/L 1.0 1.0 1.0
Manganese2,3 µg/L 7.0 16.0 208.4
Mercury2,3 µg/L 0.1 0.1 0.1
Nickel2,3 µg/L 1.0 1.0 2.6
Vanadium2,4 µg/L 10.0 10.0 10.0
Zinc2,4 µg/L 19.2 42.0 150.6
Dissolved oxygen mg/L 1.2 1.9 2.9
pH Max TBA1 TBA1 TBA1
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-22
Quality Characteristic Unit Groundwater trigger values
Minimum monitoring frequency
20th percentile 50th percentile 80th percentile
Min TBA1 TBA1 TBA1
Suspended solids mg/L 58.4 603.0 2,196.0
Total dissolved solids mg/L 25.2 47.0 177.4
Turbidity NTU 41 82 746
Total Nitrogen5 µg/L 100 385 900
Total Phosphorous5 µg/L 44.0 300.0 832.0
Nitrate5 µg/L 10.0 10.0 30.0
Escherichia coli5 Cfu/100 ml
TBA1 TBA1 TBA1
Calcium mg/L 1.0 1.0 6.0
Monthly
Carbonate/Bicarbonate (CO3/HCO3)
mg/L 1.0 1.0 1.0
Chloride mg/L 8.2 16.0 57.8
Magnesium mg/L 1.0 1.0 4.3
Potassium mg/L 1.0 1.0 3.9
Redox potential mV 99.2 141.8 192.6
Sodium mg/L 8.0 20.0 46.8
Sulphate mg/L 1.6 16.0 84.0
Specific conductance µS/cm 66.4 163.6 494.4
1. To be developed in conjunction with EHP. 2. Routine monitoring of this quality characteristic only applies to the MIA and biosolid pads groundwater
monitoring bores specified in Table 9-12. 3. To be sampled and measured as dissolved and total. 4. To be sampled as dissolved. 5. Routine monitoring of this quality characteristic only applied to the effluent irrigation area and biosolid
pads specified in Table 9-12.
9.8 Cumulative Impacts
Since the release of the EIS Metro Mining has acquired Gulf Alumina which allows the utilisation of
the SRBP MIA and BLF rather than developing similar standalone infrastructure. Additionally, since
the EIS Metro Mining has undertaken further assessment of the originally proposed haul roads and
undertaken extensive consultation with Rio Tinto Alcan in relation to locating the haul road between
BH1 and BH6 east on to Rio Tinto Alcan’s adjoining tenement. Consequently, the haul road between
BH 6 east and the originally proposed MIA is no longer required as the main SRBP haul road will be
used for the Bauxite Hills Project. The decision to utilise the SRBP infrastructure will see a reduction
in disturbance of approximately 7 ha of riverside area, the majority of which would have been
estuarine sediments under mangroves and thereby PASS, that will no longer be disturbed.
The relocation of the BH1 haul road away from HES wetland areas also contributes to a reduction
in potential impacts to water quality. The BH1 haul road now avoids the tidally influenced areas of
Bauxite Hills Project Supplementary Report to the Environmental Impact Statement
9-23
the upper Skardon River and therefore reduces the potential for sediments to mobilise and
contributing to a reduction in water quality. Moreover, the relocation of the haul road reduces the
potential for ASS to be disturbed during construction.
In relation to cumulative impacts associated with water, the use of the SRBP infrastructure will
result in a reduction in the following potential cumulative impacts:
The cumulative erosion and sediment mobilisation has been reduced as a result of the utilisation
of the SRBP MIA and BLF. By having a single disturbance area for the MIA and BLF, and the
relocation of the haul roads away from the areas adjoining the Skardon River, the potential for
the mobilisation of sediments potentially impacting upon water quality has significantly been
reduced;
The cumulative risk of ASS disturbance processes have been eliminated outside of the already
approved SRBP site; and
The cumulative risk of harmful spills (e.g. hydrocarbons, detergents, degreasers etc.) during
construction and operations storage of chemicals at the MIA (e.g. hydrocarbons, detergents,
degreasers, etc.) has been reduced as a result of the utilisation of the MIA, BLF and RoRo to the
SRBP MIA and BLF area.
The utilisation of the SRBP MIA and BLF infrastructure enables the alignment of water management
and water monitoring methods and thereby reduce potential impacts to the Skardon River and
associated HES wetlands, and in particular to establish larger buffer zone areas in the vicinity of the
HES wetland areas associated with the Skardon River.