Woodside Energy Limited Proposed Blacktip Development ... · naturally acidic soils at depth and materials, should they be potentially in contact with naturally acidic soils, should

Woodside Energy LimitedProposed Blacktip DevelopmentWadeye, Northern Territory

ACID SULPHATE SOIL INVESTIGATION

n Final (Version 02)n 9 February 2005

Woodside Energy LimitedProposed Blacktip DevelopmentWadeye, Northern Territory

ACID SULPHATE SOIL INVESTIGATION

n Final (Version 02)n 9 February 2005

Sinclair Knight MerzABN 37 001 024 0957th Floor, Durack Centre263 Adelaide TerracePO Box H615Perth WA 6001 AustraliaTel: +61 8 9268 4400Fax: +61 8 9268 4488Web: www.skmconsulting.com

COPYRIGHT: The concepts and information contained in this document are the property of SinclairKnight Merz Pty Ltd. Use or copying of this document in whole or in part without the writtenpermission of Sinclair Knight Merz constitutes an infringement of copyright.

Acid Sulphate Soil InvestigationWoodside Energy LimitedProposed Blacktip DevelopmentWadeye, Northern Territory

SINCLAIR KNIGHT MERZ

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ContentsExecutive Summary iii

1. Introduction 1

2. Background 2

3. Acid Sulphate Soil Investigation 3

3.1 Objectives 33.2 Scope of Work 33.3 Nominated Investigation Criteria 33.4 Investigation Activities 33.4.1 Investigation Areas 43.4.2 Sampling Density 43.4.3 Sampling Depths 63.4.4 Sampling Procedures 63.4.5 Field Tests 83.5 Analysis Program 83.6 Investigation Results 93.6.1 Field Observations 93.6.2 Geology 93.6.3 Field Tests 103.6.4 Analytical Results 10

4. Discussion of Results 11

5. Conclusions 13

6. Recommendations 14

7. References 15

8. Statement of Limitations 16

Appendix A Figures 17

Appendix B Tables 20

Appendix C Soil Borelogs 25

Appendix D Laboratory Reports 38

Appendix E Site Photographs 42



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Document History and StatusVersion Date issued Reviewed by Approved by Date approved Version type

01a 10/12/04 D. Donovan D. Oulton 10/12/04 Draft for internal review

01 10/12/04 D. Donovan D. Oulton 10/12/04 Draft for external review

01b 27/01/05 C. Morgan D. Oulton 08/02/05 2nd draft for external review

02 09/02/05 D. Donovan D. Oulton 09/02/05 Final

Distribution of CopiesVersion Copy no Quantity Issued to

01a 1 1 Sinclair Knight Merz (Mr. David Donovan)

01 1 1 Woodside Energy Limited (Mr. Ceri Morgan)

01b 1 1 Woodside Energy Limited (Mr. Ceri Morgan)

02 1 2 Woodside Energy Limited (Mr. Ceri Morgan)

02 2 2 Sinclair Knight Merz (File and Library Copies)

Printed: 9 February 2005

Last saved: 9 February 2005 11:12 AM

File name: I:\WVES\Projects\WV02732\Deliverables\Reports\R01sjsCM (V02).doc

Author: Stephanie Sneyd / Dion Oulton

Project manager: Dion Oulton

Name of organisation: Woodside Energy Limited

Name of project: Proposed Blacktip Development, Wadeye, Northern Territory

Name of document: Acid Sulphate Soil Investigation

Document version: 02

Project number: WV02540.500



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Executive SummaryWoodside Energy Limited (WEL) proposes to develop the Blacktip Gas Project (BlacktipDevelopment), located approximately 15km from Wadeye in the Northern Territory (NT). Theproposed project involves an offshore gas production well, an incoming wet gas pipeline, anonshore plant site, and gas export facilities.

Sinclair Knight Merz (SKM) completed a desktop assessment in January 2004 identifying the possiblepresence of Acid Sulphate Soils (ASS) or Potential Acid Sulphate Soils (PASS) in areas of the proposedBlacktip development. In recognition of the potential impact exposure of ASS or PASS soils couldhave on the environment and site infrastructure, WEL commissioned SKM to investigate thepresence or absence of ASS and PASS soils in the Blacktip Development project area.

Prior to completion of the investigation activities a sampling and analysis plan (SAP) was developedbased on the level of risk posed by ASS in the proposed development areas. Where risks were identifiedas high, the sampling program was in accordance with regulatory guidelines. Where risks of ASSconditions were identified as low to moderate, a reduced sampling program was undertaken.

A field program based on the SAP was completed, including field tests and collection of samples foranalysis. Samples were collected across three areas, selected during a desktop investigation undertakenby SKM in 2004 (SKM, March 2004), and based on the anticipated level of risk posed by ASS. Theselected areas included: Area A (landfall and beach-crossing portion of proposed pipeline route), Area B(proposed plant site and portions of the pipeline route) and Area C (near-shore zone of proposedpipeline route, from lowest astronomical tide to approximately 10 m water depth). Samples wereselected for analysis based on field observations and were analysed for the Suspended PeroxideOxidation Combined Acidity and Sulphate (SPOCAS) suite of analytes.

Based on the result of this investigation SKM conclude that:

n Based on the findings of the 'acid trail' and 'sulphur trail' lines of evidence for all samplesselected for laboratory analysis, ASS or PASS are not expected to be encountered duringconstruction activities in Areas A, B or C (where maximum depth of disturbance is understoodto be 2 mbg).

n Based on field data and laboratory data, the shallow sandy soils encountered in Area A have ahigh buffering capacity. All other soils encountered have a low to nil buffering capacity.Buffering capacity refers to the intrinsic nature of a soil to resist changes in pH, where a highbuffering capacity indicates a good resistance to change.

n The clays encountered at depth within Area A are acidic in nature. Disturbance of these acidicclays may have a negative impact on the environment by introducing an acidic medium to thenaturally alkaline marine environment, although the potential risk is considered to be Nil toVery Low due to the small exposure time and rapid tidal changes in the area. Disturbance of



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the acidic clays in Area A may also have a negative impact on infrastructure exposed to thoseclays, therefore consideration should be given to the materials used during construction, inaccordance with recommendations in the report entitled Blacktip Gas Project NearshoreGeotechnical Investigation (WEL document number B3330RU1790079).

n Due to the alternative sample handling methods undertaken in Area C as a result of access andtiming constraints, field tests and laboratory results may be biased, although still broadlyindicative of the presence or absence of ASS or PASS.

n A detailed ASS management plan to remove, remediate or manage the presence of ASS orPASS is not required.

Although ASS and PASS were not identified in the areas of investigation, naturally acidic soilswhich may have pipeline integrity issues were noted. Due to the presence of these acidic soils,SKM recommends the following:

n Consideration should be given to the design and materials of any infrastructure that may beexposed to acidic soils across Areas A, B and C. Design should minimise disturbance ofnaturally acidic soils at depth and materials, should they be potentially in contact withnaturally acidic soils, should be acid-resistant where possible.

n Any dredging or excavation management plans for Areas A and C should consider the effectsof low pH (acidic) soils and their potential impacts on the environment.



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1. IntroductionWoodside Energy Limited (WEL) proposes to develop the Blacktip Gas Project, locatedapproximately 15km from Wadeye in the Northern Territory (NT) (the site). The proposed projectinvolves an offshore gas production well, an incoming wet gas pipeline, an onshore plant site, andgas export facilities.

Sinclair Knight Merz (SKM) completed a desktop investigation, including an assessment of potentialrisks, in January 2004 identifying the possible presence of Acid Sulphate Soils (ASS) or Potential AcidSulphate Soils (PASS) in proposed Blacktip Development project area (SKM, March 2004).

During the development of the proposed project, sub-surface soils will be disturbed and ASS orPASS may be encountered. In recognition of the potential impact exposure of these soils couldhave on the environment and site infrastructure, and as required in the Draft Environmental ImpactStatement (EIS) guidelines produced by the Office of Environment and Heritage, Department ofInfrastructure, Planning and Environment (DIPE), NT Government, WEL commissioned SKM toinvestigate the presence or absence of ASS and PASS soils in the Blacktip Development projectarea.

Please note that for the purposes of this investigation the word 'sulphate' is consideredinterchangeable for 'sulfate', being a simple variant in spelling. Certain guideline materials refer to'sulphate' while others refer to 'sulfate'. 'Sulphate' is the spelling chosen for this report, althoughthe alternative spelling is retained in report and document references.




2. BackgroundSKM was commissioned in January 2004 to conduct a desktop assessment to determine thepotential occurrence of ASS in areas of the proposed Blacktip Development onshore plant site thatwill be disturbed during development activities. Results of the desktop assessment are detailed inthe following report:

n Blacktip Development Onshore Plant Site and Gas Pipeline Route, Wadeye/Port Keats, NorthernTerritory – Desktop Assessment of Acid Sulfate Soils – Version 03 – 5 March 2004 (WV02540.500R01dadUP).

Areas included in the desktop assessment (SKM, March 2004) comprised the pipeline landfall area,approximately two kilometres (km) of incoming wet gas onshore pipeline and the proposed plantsite. These areas are collectively identified in this report as ‘areas of the proposed development’.

The objective of the desktop assessment was to conduct a preliminary appraisal of ASS riskassociated with soils in the areas of the proposed development that will be disturbed duringdevelopment activities. Based on the results of the desktop assessment, SKM (March 2004)concluded the following:

n there is a moderate to high risk of ASS conditions in soils associated with the landfall and beach-crossing portion of the proposed pipeline route; and

n there is a low to nil risk of ASS conditions in soils associated with the proposed plant site andportions of the proposed pipeline route.

Based on the conclusions derived from the desktop assessment, SKM recommended that soilinvestigations be conducted to determine the actual presence of ASS in areas of the proposeddevelopment that will be disturbed during development activities.

Subsequent to the completion of the desktop assessment and SKM's recommendation, discussionswith the NT Government identified the need to undertake an assessment of ASS conditions in thenear-shore zone of the proposed development, being from lowest astronomical tide (LAT) toapproximately 10 m water depth. The NT Government identified sediments within this zone ashaving a potentially high risk of ASS conditions if disturbed.

Geotechnical works within the near-shore zone had been completed when the sampling andanalysis program for the investigation was developed. Originally the collection of samples for ASSanalysis was to occur simultaneously with geotechnical works within the near-shore zone, howevertime and practical constraints meant that SKM was not present during these works. Preliminaryinformation from geotechnical drilling activities indicated the presence of shallow bedrock in thenear-shore zone. The presence of shallow bedrock suggests that the risk of ASS conditions mightbe reduced from high to 'low to moderate'. Based on this preliminary assessment, an alternativeapproach to ASS assessment in the near-shore zone was developed and is detailed in this report.




3. Acid Sulphate Soil Investigation

3.1 ObjectivesThe objectives of this ASS investigation are to:

n determine whether actual ASS are present beneath the areas proposed to be disturbed duringconstruction activities;

n determine whether PASS are present beneath the areas proposed to be disturbed duringconstruction activities; and

n determine whether a detailed ASS management plan is required.

3.2 Scope of WorkIn order to achieve the objectives, SKM’s scope of work included the completion of:

n a sampling and analysis plan;

n shallow test pits and soil bores;

n collection of soil samples;

n field testing of soil samples for pHF and pHFOX;

n submission of soil samples for laboratory analysis; and

n reporting of analytical results.

3.3 Nominated Investigation CriteriaBased on discussions with Sandra Pidsley (Environmental Assessment Officer (Marine), Office ofEnvironment and Heritage, DIPE, NT Government), the investigation of ASS conditions at theproposed Blacktip Development was conducted using the following reference:

n Guidelines for Sampling and Analysis of Lowland Acid Sulfate Soils (ASS) in Queensland 1998(Ahern et al., October 1998 - Revision 4.0).

These guidelines are part of the Queensland Acid Sulfate Soil Technical Manual - Soil ManagementGuidelines (Department of Natural Resources and Mines, 2002), which outlines a risk-basedapproach to best practice management of ASS.

3.4 Investigation ActivitiesPrior to completion of the investigation activities a sampling and analysis plan (SAP) wasdeveloped based on the level of risk posed by ASS in the proposed development areas. Whererisks were identified as high, the sampling program is in accordance with regulatory guidelines.Where risks of ASS conditions were identified as low to moderate, a reduced sampling programwas undertaken. The SAP was submitted to WEL for approval. Details of the SAP have beenincorporated into this report.




3.4.1 Investigation AreasBased on results of the desktop assessment (SKM, March 2004) and subsequent discussions withNT Government, the site was subdivided into three areas based on the risk of ASS conditions andsampling constraints. The three areas and associated sample locations are illustrated in Figures 1and 2, Appendix A and are described below.

Area A – the landfall and beach-crossing portion of the proposed pipeline route, which wasidentified as having moderate to high risk of ASS conditions.

Area B – the proposed plant site and portions of the proposed pipeline route, which was identifiedas having low to nil risk of ASS conditions.

Area C – the near-shore zone of the pipeline route, within the dredge zone from LAT to 10 mwater depth (estimated), which was identified as having a high risk of ASS conditions. However,preliminary review of geotechnical information obtained from this area indicated the presence ofshallow bedrock, therefore a reduction to a low to moderate level of risk of ASS conditions isappropriate.

3.4.2 Sampling DensityIn general, the nominated investigation criteria require the following sampling regime:

n 1 sample location per 50 metres (m) of pipeline;

n 2 sample locations per hectare (ha) of disturbed land;

n investigation of soils to at least 1 m below the depth of the proposed disturbance or to at least 2 mbelow the land surface, whichever is greater;

n field testing of soil samples at 0.25 m vertical intervals; and

n laboratory analysis of soil samples at 0.5 m vertical intervals.

WEL advised SKM that the maximum depth of soil disturbance associated with the proposeddevelopment is 2 metres below grade (mbg).

The sampling rationale followed in this investigation was based on consideration of the level ofrisk each of the proposed areas of development poses to the environment as well as specificconstraints placed on sampling in some areas. The sampling rationale for each of the investigationareas is described below:

Area A

The landfall and beach-crossing portion of the proposed pipeline route were identified as having amoderate to high risk of ASS conditions (SKM, March 2004). These areas represent the highestrisk to the environment (ie. near-shore marine). The sampling program in this area, includinglateral and vertical sampling density, was undertaken in accordance with regulatory requirements.

A total of six boreholes were sampled within Area A (OSA12 through OSA17).




Area B

This portion of the proposed pipeline route and the proposed plant site were identified as having alow to nil risk of ASS conditions (SKM, March 2004). These areas are located away from the nearshore marine environment. Based on the identified low risk and the distance from sensitiveenvironmental receptors, the sampling program in this area was reduced with regard to lateralsampling density.

The reduction in lateral sampling density for Area B equates to one sampling point for every 500metres of proposed pipeline and the completion of six sampling points in the area of the proposedplant site. Sampling locations at the proposed plant site were confined to the area of the site thatwill be disturbed during development activities (ie. building footprint areas).

Field testing of soil samples in Area B was undertaken at the recommended vertical intervals of0.25 m. However, based on the identified reduced risk of ASS conditions in Area B, only onesample per sample location was selected for laboratory analysis. Samples selected for laboratoryanalysis were based on field observations and field testing. All samples collected during theseworks were stored for future analysis if required.

A total of four boreholes were sampled along the pipeline portion of Area B (OSB18, OSB20,OSB22 and OSA24) and six boreholes were sampled within the proposed plant site (OSB23 andOSB25 through OSB29).

Area C

The near-shore zone was identified as having a high risk of ASS conditions, therefore SKMinitially proposed no reduction in sampling requirements. However, geotechnical works(comprising the drilling of ten boreholes) commenced in the near-shore zone prior to SKMreaching the site. With this constraint in mind, SKM utilised sample cores collected as part of thegeotechnical works for this ASS investigation.

It should be noted that cores obtained from the near-shore zone geotechnical investigation were notcollected in accordance with the general standards required for ASS analysis (ie. samples were notfrozen immediately following collection and field testing for ASS was not undertaken). As such,the analytical results for these samples will provide an indication only of the potential presence ofASS and, based on discussions with laboratory personnel and marine experts, may result in a biasof results, with acidity values biased high and sulphur values biased low. However analysis ofsamples collected as part of the geotechnical component should provide sufficient qualitative andquantitative data to allow assessment of ASS conditions.

Based on the expected bias of laboratory results and reduced risk of ASS conditions due to thepresence of shallow bedrock, a reduced sampling program was conducted in Area C. The samplingprogram comprised the collection and analysis of one sample (minimum) from half (five) of the tengeotechnical borehole cores completed in this area.




3.4.3 Sampling DepthsSampling depths were based on the anticipated depth of disturbance and consideration ofregulatory requirements. With an anticipated depth of disturbance of 2 mbg and a requirement tosample at least one metre below the depth of disturbance, most locations were sampled to a depthof 3 mbg. However, due to variations in site conditions, investigation depths varied in somelocations as follows:

n the sampling depths were reduced at OSB20 (1.0mbg), OSB22 (1.0mbg) and OSB24 (2.75mbg)within Area B due to the presence of shallow rock; and

n sampling depths were increased to 6.0 mbg at OAS16 and OSA17 within Area A due totopographic variations and advice from Mr. Paul Hefer (Advanced Geomechanics) that the pipelineinstallation would be at an increased depth at these locations.

3.4.4 Sampling ProceduresAs described in Section 3.4.2, core material had been collected as part of the geotechnicalinvestigation in Area C prior to SKM's arrival on site. Separate sampling procedures are thereforedescribed for Areas A and B (where samples were collected as per ASS regulatory requirements)and for Area C (where samples were not collected as per ASS regulatory requirements).

Areas A and B

ASS investigation activities within Areas A and B were conducted in association with thegeotechnical works being completed for the Blacktip Development Project. On shore sampling wasconducted using the equipment available (e.g. drill rig or backhoe), as detailed below:

n OSA12 to OSA17, OSB23 and OSB25 to OSB29 were completed using a drill rig equipped with ahollow flight auger with split sampler.

n All other sampling locations within Areas A and B were completed using a backhoe to completetest pits.

The sampling methodology within Areas A and B was in accordance with regulatory requirementsand is described below.

n Bore logs were completed for all sample locations (included within Appendix C).

n Australian Map Grid (AMG52) coordinates for each sampling location was recorded on bore logs.

n Soil samples were collected at 0.25 m intervals or at changes in soil horizons, except where corelosses occurred and no sample was available.

n Sampling and field testing equipment was decontaminated between sampling points using a highpressure washing system and a phosphate free detergent.

n Sampling included the recording of depths below ground level and field descriptions of texture,colour, mottling, presence of jarosite, shell or carbonate material (including abundance and size).




n Where the presence of carbonate material was confirmed in the field by a positive reaction(effervescence) with hydrochloric acid (HCl), an attempt was made to remove all visible shellmaterial from the laboratory sample.

n Field pH tests were conducted on all field samples and included measurements of field pH (pHF)using a field pH meter and deionised water, field peroxide pH (pHFOX) using 30% hydrogenperoxide and mono-sulfides using HCl.

n Samples collected for laboratory analysis were immediately placed in sealable polyethylenecontainers appropriately identified using a waterproof marking pen. Air was excluded from thesampling containers and the containers were immediately placed into a portable freezer.

n The samples were kept frozen until ready for insulated transport to the laboratory using chain ofcustody documentation.

SKM understands that groundwater will not be dewatered during development in Areas A and B,therefore no groundwater investigations were conducted. Groundwater was not encountered duringASS investigation activities.

Area C

As identified within Section 3.4.2, geotechnical works in the near-shore zone, including thecollection of geotechnical cores, were completed prior to SKM's arrival at the site. Informationprovided by Advanced Geomechanics indicates that undisturbed sample material was sealedimmediately after collection to prevent moisture loss and was transported to Perth for geotechnicalanalysis.

SKM employed following sampling procedure for ASS in Area C soils.

n SKM was present when core/sample boxes were opened and cores were unsealed.

n Sampling included the recording of depths below ground level and field descriptions of texture,colour, mottling, presence of jarosite, shell or carbonate material (including abundance and size).

n Where the presence of carbonate material was confirmed in the field by a positive reaction(effervescence) with hydrochloric acid (HCl), an attempt was made to remove all visible shellmaterial from the laboratory sample.

n pH tests were conducted using a field test kit on all samples and included measurements of pH(pHF) using a pH meter and deionised water, peroxide pH (pHFOX) using 30% hydrogen peroxidesolution and mono-sulfides using HCl.

n Sampling and testing equipment was decontaminated between samples/tests where required.

n Samples collected for laboratory analysis were immediately placed in sealable polyethylenecontainers appropriately identified using a waterproof marking pen. Air was excluded from thesampling containers and the containers will be transport to the laboratory using chain of custodydocumentation.




As noted, initial sample handling procedures for material collected from Area C is not inaccordance with regulatory requirements. As such, analytical results will provide an indicationonly of the potential presence of ASS.

3.4.5 Field TestsBased on the nominated investigation criteria, to determine PASS in the field the following factorsneed to be considered:

n strength of the reaction with peroxide;

n the difference between pHF and pHFOX; and

n absolute pHFOX values.

In addition, a simple matrix to aid in the determination of ASS and PASS in the field has beenestablished by the former Acid Sulfate Soils Management Advisory Committee of New SouthWales (ASSMAC, 2000) and is detailed below.

pH measurement type ASS PASS Neither ASS or PASS

pHF <4 >4 >4

pHFOX <4 <4 >4

The amount of carbonate material present in a soil may be indicative of the pH buffering capacityof that soil and is estimated in the field by observing the strength of the reaction of the soils withdilute hydrochloric acid (HCl). Stronger reactions are recorded with increasing carbonate content.

3.5 Analysis ProgramThe laboratory analysis of samples, including those collected from Areas A, B and C, wasconducted by Marine and Freshwater Research Laboratory (MAFRL). MAFRL is located atMurdoch University in Perth, Western Australia and is a NATA-accredited facility (accreditationno. 10603).

Samples were selected for analysis based on field observations, including soil type and field pHtests. All soil samples selected for analysis were analysed for the Suspended Peroxide OxidationCombined Acidity and Sulphate (SPOCAS) suite of analytes, as detailed below:

n pH(KCL) - KCL extractable pH;

n pH(OX)- Peroxide oxidised pH;

n TAA - Total Actual Acidity;

n TPA - Total Potential Acidity;

n S(KCL) - KCL extractable sulphur;

n S(P) - Peroxide sulphur;

n S(RAS) - Residual acid soluble sulphur;




n Ca(KCL) - KCL extractable calcium;

n Ca(P) - Peroxide calcium;

n Mg (KCL) - KCL extractable magnesium;

n Mg (P) - Peroxide oxidisable magnesium; and

n ANC - Acid neutralising capacity.

In order to compare the analytical results to the action criteria specified in the regulatoryguidelines, several calculations were performed. Total Sulphidic Acidity (TSA), PeroxideOxidisable Sulphur S(POS) and pH difference were calculated.

All sample material sent to the laboratory for analysis was dried and stored appropriately atMAFRL in the event that future analysis is required.

ASS and PASS assessment of SPOCAS results is based on 2 lines of evidence: the ‘acid trail’ andthe ‘sulphur trail’. The 'acid trail' considers pH(KCL), TAA, TPA and TSA results and the 'sulphurtrail' considers pH(OX), S(KCL), S(P), S(RAS) and S(POS). Ca(KCL), Ca(P), Mg (KCL) Mg (P)and ANC are used to assess buffering capacity of the soils should ASS or PASS be detected.

ASS or PASS are identified to be present when both the 'acid trail' and the 'sulphur trail' lines ofevidence show indicative concentrations. If either the 'acid trail' or the 'sulphur trail' lines ofevidence are incomplete (ie. below detection or action criteria) then ASS or PASS are not present.

3.6 Investigation Results

3.6.1 Field ObservationsGeological bore logs for investigation locations are included within Appendix C. Site photographsare included within Appendix E.

3.6.2 GeologyArea AThe geology underlying Area A is generally characterised as light brown, fine- to medium-grainedsands containing a large percentage of shell fragments to approximately 2.0 mbg, underlain by red,yellow and grey motley clays with a high plasticity to the extent of the investigation.

Area BFor the purposes of a generalised geological description, Area B is divided here into the plant siteand the pipeline route.

The geology underlying the plant site portion of Area B is generally characterised as red-brown,fine- to medium-grained silty sands, becoming clayey at depth.




The geology underlying the pipeline route is generally characterised as red-brown fine- to medium-grained silty sands, becoming clayey at depths ranging from 0.75 mbg to 2.25 mbg. This materialoverlies gravelly sands containing pisolitic laterite to depths ranging from 0.75 mbg to 2.75 mbg,which in turn overlies cemented ferricrete. The vertical extent of the ferricrete is unknown, as theequipment available was unable to penetrate this layer.

Area CThe geology underlying Area C is generally characterised as iron-rich clay, light grey with red,brown, yellow mottles to the maximum depth of ASS investigation. It should be noted thatboreholes in Area C were continued as part of the geotechnical investigations.

3.6.3 Field TestsField test results indicate the following:

n Based on consideration of the three factors and the matrix outlined in Section 3.4.5, none of thesoils tested exhibited characteristics of ASS or PASS.

n Based on this assessment tool, sandy soils encountered at all sampling locations in Area Aexhibited a medium to high buffering capacity, all other soils sampled exhibited a low to nilbuffering capacity.

3.6.4 Analytical ResultsAnalytical results are included in Table 1 through 3, Appendix B. Laboratory certificates andchain of custody documentation is included in Appendix D.

Laboratory results indicate the following:

n Calculated TSA values ranged from 0 to 11 equivalent moles of hydrogen per tonne (mol H/t) withthe highest levels associated with two samples from Area B and a shallow near-shore samplecollected close to LAT in Area C. All calculated TSA values are below the action criteria providedin the nominated investigation criteria.

n Calculated S(POS) values ranged from <0.001 to 0.110 kilograms of hydrogen sulphide per tonneof soil (kg H2SO2/t of soil) with the highest levels associated with the shallow sandy soilsencountered in Area A. All other S(POS) values were below the action criteria given in thenominated investigation criteria or established as effectively 0 mol H/t.

n Calculated pH differences ranged from 0 to 2.9 with the largest difference associated with theshallow sandy soils encountered in Area A.

n pH (KCl) vales ranged from 4.3 to 10.1 with the lowest pH values associated with the claysencountered in Area A and the highest pH values associated with the shallow sandy soilsencountered in Area A.

n A comparison of quality control duplicate samples and their corresponding primary samplesindicates an overall acceptance of field sampling techniques and analytical results.




4. Discussion of ResultsCalculated TSA results above 0 mol H/t, although not exceeding action criteria within thenominated investigation criteria, were reported in two deep samples from Area B (OSB18-3.0 andOSB29-3.0) and two shallow near-shore samples in Area C (NS6-2.8 and NS10-0.1), indicative ofacidic conditions. These conditions are reflected in the low field and laboratory measured pHvalues from those samples. The S(POS) results for the corresponding samples do not exceed theaction criteria set in the nominated investigation criteria. The determination of the presence of ASSor PASS requires both the 'acid trail' and 'sulphur trail' lines of evidence to be complete (seeSection 3.5). Based on the analytical results of this investigation, ASS and PASS are not present inAreas B or C.

Laboratory S(POS) results were recorded above the action criteria in shallow sandy soilsencountered within Area A (OSA12-0.0, 0.5, 1.0; OSA13-0.5, 1.0; OSA14-0.0, 0.5, 1.0; OSA15-0.5, 1.0, 1.5, 2.5; OSA16-1.0 to 5.0 and OSA17-0.5). TSA results for the corresponding samples donot exceed the action criteria set within the nominated investigation criteria. Based on theanalytical results of this investigation and the incomplete lines of evidence, ASS and PASS are notpresent in Area A.

The natural pH of the soils analysed is best represented by the pH (KCL) value. Based on resultsmeasured in this investigation, shallow sandy soils encountered in Area A can be broadly describedas alkaline while deeper clays in Area A are acidic. Soils in Area B are slightly acidic and soilswithin Area C are neutral to alkaline at the surface, becoming slightly acidic at depth.

The alkalinity of the shallow sandy soils in Area A is indicative of shallow marine sediments,which interact with the naturally alkaline marine environment. Although not indicative of ASS orPASS, the acidity of the deeper (approximately 2.5 mbg) underlying clays in this area should benoted as there may be associated pipeline integrity issues. SKM understand that material excavatedduring construction operations will be deposited alongside the trench and used as backfill material.

Area A is located within the intertidal zone, therefore there may be environmental consequencesshould acidic soils be exposed to an un-buffered environment, such as exposure during low tideevents. Such an occurrence could result in the leaching of acids from these soils during rainfallevents and the exposure of acidic waters to the marine environment. However, given the smallexposure time and rapid tidal changes in the area, the potential risks are considered to be Nil toVery Low.

Should acidic clays be exposed in Area C, the high natural buffering capacity of seawater should besufficient to neutralise the acidity and protect the environment.




As noted in Section 3.4.4, initial sample handling procedures for material collected from Area Cwere not in accordance with regulatory requirements due to timing and access constraints duringtesting. Discussions with laboratory personnel and marine experts prior to analysis identified thatanalysis of such samples produces biased results, where acidity values are biased high and sulphurvalues are biased low. The data produced from analysis of samples from Area C is consideredsufficient to allow both a qualitative and quantitative assessment of ASS and PASS conditions.

Correlation between field and laboratory analysed samples is sufficient for the purposes of thisinvestigation.




5. ConclusionsBased on the result of this investigation SKM conclude that:

n Based on the findings of the 'acid trail' and 'sulphur trail' lines of evidence for all samples selectedfor laboratory analysis, ASS or PASS are not expected to be encountered during constructionactivities in Areas A, B or C (where maximum depth of disturbance is understood to be 2 mbg).

n Based on field data and laboratory data, the shallow sandy soils encountered in Area A have a highbuffering capacity. All other soils encountered have a low to nil buffering capacity. Bufferingcapacity refers to the intrinsic nature of a soil to resist changes in pH, where a high bufferingcapacity indicates a good resistance to change.

n The clays encountered at depth within Area A are acidic in nature. Disturbance of these acidic claysmay have a negative impact on the environment by introducing an acidic medium to the naturallyalkaline marine environment, although the potential risk is considered to be Nil to Very Low due tothe small exposure time and rapid tidal changes in the area. Disturbance of the acidic clays in AreaA may also have a negative impact on infrastructure exposed to those clays, therefore considerationshould be given to the materials used during construction, in accordance with recommendations inthe report entitled Blacktip Gas Project Nearshore Geotechnical Investigation (WEL documentnumber B3330RU1790079).

n Due to the alternative sample handling methods undertaken in Area C as a result of access andtiming constraints, field tests and laboratory results may be biased, although still broadly indicativeof the presence or absence of ASS or PASS.

n A detailed ASS management plan to remove, remediate or manage the presence of ASS or PASS isnot required.




6. RecommendationsAlthough ASS and PASS were not identified in the areas of investigation, naturally acidic soilswhich may have pipeline integrity issues were noted. Due to the presence of these acidic soils,SKM recommends the following:

n Consideration should be given to minimising or avoiding the disturbance of clay material inArea A.

n Consideration should be given to the design and materials of any infrastructure that may beexposed to acidic soils across Areas A, B and C. Design should minimise disturbance ofnaturally acidic soils at depth and materials, should they be potentially in contact withnaturally acidic soils, should be acid-resistant where possible.

n Any dredging or excavation management plans for Areas A and C should consider the effectsof low pH (acidic) soils and their potential impacts on the environment.




7. ReferencesAhern, C.R., Ahern, M.R. and Powell, B. (1998) Guidelines for Sampling and Analysis of LowlandAcid Sulfate Soils (ASS) in Queensland 1988. QASSIT, Department of Natural Resources,Resource Sciences Centre, Indooroopilly.

ASSMAC (2000) Acid Sulfate Soils - Keys to Success. New South Wales Acid Sulfate SoilsManagement Advisory Committee.

Department of Natural Resources (2002) Queensland Acid Sulfate Soil Technical Manual - SoilManagement Guidelines.

Sinclair Knight Merz (March 2004) Blacktip Development Onshore Plant Site and Gas Pipeline Route,Wadeye/Port Keats, Northern Territory – Desktop Assessment of Acid Sulfate Soils – Version 03 – 5March 2004 (WV02540.500-R01dadUP).

Woodside Energy Limited, Blacktip Gas Project Nearshore Geotechnical Investigation (WELdocument reference B3330RU1790079).




8. Statement of LimitationsThis report presents the results of this investigation, which was prepared for the purpose of thiscommission. The information provided herein relates only to the project of this commission andmust be reviewed by a competent engineer/scientist before being used for any other purpose. SKMaccepts no responsibility for other use of the information.

Where investigations have been performed and recorded by others, the data is included and used inthe form provided. The responsibility for the accuracy of such data remains with the issuingauthority, not with SKM.

The advice tendered in the report is based on information obtained from the locations identified inthe report and is not warranted in respect to the conditions that may be encountered across the siteat other than these locations.

An understanding of the site conditions depends on the integration of many pieces of information,some regional, some site specific, some structure specific and some experience based. Hence thisreport should not be altered, amended or abbreviated, issued in part or issued incomplete in anyway without prior checking and approval by SKM. SKM accepts no responsibility for anycircumstances, which arise from the issue of the report, which has been modified in any way asoutlined above.




Appendix A Figures

Figure 1: Conceptual DiagramIllustrating Investigation LocationsAcid Sulphate Soil InvestigationProposed Blacktip Development

Version:

Date Drawn:

Date Printed:

Project Ref:

2

08/12/2004

09/02/2005

WV02540.500

Area C

Area AArea B

Plant Site

Approximately 300 m Approximately 2000 mApproximately 2000 m

LowestAstronomical

Tide~ 10 m

Water Depth

Pipeline(buried at2 mbgl)

Timor Sea

Treeline

WESTEAST

NS2NS4

NS6

NS8

NS10OSA12 OSA14 OSA16

OSB18 OSB20 OSB22 OSB24

HighestAstronomical

Tide

OSA13 OSA15 OSA17

Midden andDunes

NSXOSAXOSBX

Nearshore boreOnshore Area A boreOnshore Area B bore

KEY

- Bores OSA16 and OSA17 completed to 6 mbgs.- All other bores completed to 3 mbgs.- Bore logs provided in Appendix C.- WEL bore nomenclature for Areas A and B included on bore logs.- Relative locations of ASS investigation boreholes are illustrated in Figure 2.

Refer to Figure 2for Proposed Plant Siteinvestigation locations

NOT TO SCALE

64 ha

Figure 2: ASS InvestigationBorehole LocationsAcid Sulphate Soil InvestigationProposed Blacktip Development

Version:

Date Drawn:

Date Printed:

Project Ref:

1

10/12/2004

09/02/2005

WV02540.500

8425000

8426000

5425

00

8425200

8425400

8425600

8425800

5430

00

5435

00

5440

00

5445

00

5450

00

5455

00

5460

00

5465

00

5470

00

5475

00

NS2NS4 NS6

NS10

OSB18

OSB20 OSB22 OSB24NS8

8425300

8425400

8425500

5442

00

5443

00

5444

00

5445

00

5446

00

OSA12OSA13 OSA14

OSA15 OSA16 OSA17

OSB18

- Near shore bore locations obtained from Advanced Geomechanics bore logs- Onshore Areas A and B locations obtained from Advanced Geomechanics Spreadsheet- SKM bore logs provided in Appendix C- WEL bore nomenclature for Areas A and B included on bore logs- Locations provided in MGA Zone 52 format

5471

00

5472

00

5473

00

5474

00

5475

00

5470

00

5469

00

5468

00

5467

00

5466

00

5465

00

8425000

8425100

8425200

8425300

8425400

8425500

8425600

8425700

8425800

8425900

8426000

EASTING

NO

RT

HIN

G

OSB27

OSB26

OSB25

OSB23

OSB28

OSB29

NSXOSAXOSBXGeotechnical borehole only

Nearshore bore (SKM & WEL nomenclature)Onshore Area A bore (SKM nomenclature)Onshore Area B bore (SKM nomenclature)

KEY

EASTING

NO

RT

HIN

G

NO

RT

HIN

G

EASTING

Area C

Area A Area B




Appendix B Tables

Acid Sulphate Soils InvestigationProposed Blacktip DevelopmentWadeye, Northern Territory

Table 1 - Area A SPOCAS Analytical Results (Interim)

LAB METHOD 23A 23B 23F 23Q 23G 23C 23D 23R 23V 23W 23S 23TSAMPLE pH (KCL) pH (OX) TAA ANC(E) TPA S(KCl) S(P) S(RAS) Ca(KCl) Ca(P) Mg(KCl) Mg(P) TSA S(POS) pH diff

mol H/t mol H/t mol H/t %S %S %S %Ca %Ca %Mg %Mg (TPA-TAA) (P-KCL)(pH(OX)-pH(KCL))

OSA 12 0.0m 10.0 7.7 0 6200 0 0.034 0.098 0.064 0.18 10 0.052 0.44 0 0.064 2.4OSA 12 0.5m 10.1 7.5 0 6200 0 0.031 0.096 0.065 0.16 9.9 0.060 0.44 0 0.065 2.5QC1 (field duplicate of OSA12-0.5) 9.9 7.4 0 3700 0 0.033 0.065 0.031 0.11 5.9 0.039 0.28 0 0.032 2.5OSA 12 1.0m 10.1 7.2 0 4200 0 0.031 0.072 0.042 0.20 6.8 0.048 0.32 0 0.041 2.9OSA 12 1.5m 9.6 7.8 0 880 0 0.011 0.017 0.005 0.24 1.4 0.044 0.084 0 0.006 1.8OSA 12 2.0m 7.8 7.2 0 150 0 0.011 0.005 <0.001 0.26 0.38 0.13 0.15 0 -0.006 0.6OSA 12 2.5m 4.3 4.9 89 0 67 0.002 0.001 <0.001 0.077 0.088 0.11 0.12 -22 -0.001 -0.6OSA 12 3.0m 4.4 4.7 112 0 92 0.003 <0.001 <0.001 0.058 0.066 0.088 0.098 -20 <0.001 -0.3OSA 13 0.5m 10.1 7.6 0 6200 0 0.028 0.096 0.068 0.17 10 0.058 0.44 0 0.068 2.5OSA 13 1.0m 10.1 7.7 0 8800 0 0.027 0.12 0.093 0.14 14 0.052 0.54 0 0.093 2.4OSA 13 1.5m 9.9 7.8 0 8600 0 0.032 0.12 0.086 0.17 15 0.055 0.49 0 0.088 2.1OSA 13 2.0m 8.9 7.4 0 470 0 0.013 0.008 <0.001 0.23 0.79 0.097 0.12 0 -0.005 1.5OSA 13 2.5m 6.2 6.7 10 100 0 0.004 0.004 <0.001 0.24 0.29 0.14 0.16 -10 0.000 -0.5OSA 13 3.0m 4.6 5.6 57 0 21 0.003 <0.001 <0.001 0.14 0.17 0.11 0.11 -36 <0.001 -1.0OSA14 0.0m 9.5 8.0 0 5800 0 0.030 0.086 0.056 0.21 9.5 0.076 0.38 0 0.056 1.5OSA14 0.5m 9.7 8.0 0 8600 0 0.026 0.12 0.091 0.18 14 0.061 0.50 0 0.094 1.7OSA14 1.5m 9.8 8.2 0 9200 0 0.014 0.11 0.099 0.15 15 0.048 0.59 0 0.096 1.6OSA14 2.0m 8.5 8.1 0 650 0 0.008 0.010 0.002 0.29 1.2 0.13 0.17 0 0.002 0.4OSA14 2.5m 5.8 6.7 14 80 0 0.003 <0.001 <0.001 0.25 0.31 0.15 0.16 -14 <0.001 -0.9OSA14 3.0m 4.8 5.8 38 0 4 0.004 0.002 <0.001 0.18 0.23 0.14 0.15 -34 -0.002 -1.0OSA15 0.5m 10.1 7.8 0 8400 0 0.026 0.12 0.096 0.17 14 0.061 0.63 0 0.094 2.3OSA15 1.0m 10.0 8.1 0 12000 0 0.027 0.13 0.11 0.11 20 0.052 0.54 0 0.103 1.9OSA15 1.5m 9.9 7.9 0 12000 0 0.030 0.14 0.11 0.13 20 0.051 0.57 0 0.110 2.0OSA15 2.5m 9.4 8.2 0 4900 0 0.026 0.066 0.040 0.18 7.4 0.071 0.34 0 0.040 1.2OSA15 3.0m 8.3 7.6 0 170 0 0.020 0.019 <0.001 0.23 0.35 0.13 0.15 0 -0.001 0.7

KEY1 - Laboratory methods described in Acid Sulfate Soils, Laboratory Methods Guidelines , Department of Natural Resources (2004)

SPOCAS - Suspended Peroxide Oxidation Combined Acidity and Sulphur

pH (KCL) - KCL extractable pH

pH (OX) - Peroxide Oxidised pH

TAA - Total Actual Acidity

ANC - Acid Neutralising Capacity

TPA - Total Potential Acidity

S(KCL) - KCL extractable Sulphur

S(P) - Peroxide Sulphur

S(RAS) - Residual Acid Soluble Sulphur

Ca(KCL) - KCL extractable Calcium

Ca(P) - Preoxide Calcium

Mg (KCL) - KCL extractable Magnesium

Mg (P) - Peroxide oxidisable Magnesium

TSA - Total Sulphidic Acidity

S(POS) - Peroxide Oxidisable Sulphur

Calculations

I:\\WVES\Projects\WV02732\Technical\Tables.xls

Acid Sulphate Soils Investigation

Proposed Blacktip Development

Wadeye, Northern Territory

Table 1 - Area A SPOCAS Analytical Results (Interim)



OSA16 1.0m 10.0 8.3 0 7300 0 0.006 0.081 0.076 0.17 12 0.020 0.46 0 0.075 1.6QC2 (field duplicate of OSA16-1.0) 9.9 7.7 0 6200 0 0.029 0.094 0.065 0.14 10 0.047 0.44 0 0.065 2.2OSA16 1.5m 10.0 8.4 0 8600 0 0.005 0.073 0.068 0.17 11 0.026 0.43 0 0.068 1.6OSA16 2.0m 10.0 8.2 0 7700 0 0.005 0.078 0.072 0.18 13 0.034 0.46 0 0.073 1.7OSA16 2.5m 9.9 9.1 0 8700 0 0.006 0.099 0.093 0.15 15 0.031 0.50 0 0.093 0.9OSA16 3.0m 9.9 8.1 0 6800 0 0.004 0.067 0.063 0.16 11 0.027 0.43 0 0.063 1.8OSA16 3.5m 9.9 9.9 0 9400 0 0.006 0.097 0.090 0.15 16 0.039 0.54 0 0.091 0.0OSA16 4.0m 9.9 9.8 0 11000 0 0.008 0.11 0.11 0.12 19 0.038 0.51 0 0.102 0.1OSA16 4.5m 9.8 9.2 0 5600 0 0.010 0.037 0.027 0.12 9.5 0.023 0.23 0 0.027 0.6OSA16 5.0m 9.9 8.9 0 6400 0 0.012 0.046 0.034 0.13 11 0.030 0.28 0 0.034 1.0OSA16 5.5m 9.9 9.7 0 7900 0 0.012 0.037 0.025 0.16 14 0.026 0.28 0 0.025 0.2OSA16 6.0m 8.8 7.2 0 150 0 0.006 0.003 <0.001 0.29 0.38 0.14 0.15 0 -0.003 1.5OSA17 0.5m 9.9 9.0 0 5900 0 0.004 0.062 0.058 0.13 9.9 0.010 0.25 0 0.058 0.9OSA17 1.0m 10.0 8.3 0 2200 0 0.004 0.019 0.015 0.15 3.2 0.010 0.091 0 0.015 1.7OSA17 1.5m 10.0 8.0 0 2600 0 0.003 0.023 0.019 0.17 3.8 0.016 0.16 0 0.020 2.0OSA17 2.0m 9.9 7.7 0 1700 0 0.002 0.010 0.007 0.18 2.6 0.013 0.055 0 0.008 2.2OSA17 2.5m 9.8 8.5 0 2200 0 0.003 0.014 0.011 0.17 3.3 0.017 0.12 0 0.011 1.3OSA17 3.0m 9.9 9.2 0 2700 0 0.003 0.017 0.015 0.18 4.1 0.020 0.15 0 0.014 0.8OSA17 3.5m 9.9 9.4 0 3300 0 0.004 0.021 0.017 0.17 5.2 0.019 0.13 0 0.017 0.5OSA17 4.0m 9.9 9.1 0 2300 0 0.003 0.015 0.013 0.16 3.6 0.017 0.12 0 0.012 0.8OSA17 4.5m 9.8 9.5 0 7900 0 0.003 0.012 0.009 0.16 14 0.010 0.19 0 0.009 0.3OSA17 5.0m 9.9 8.1 0 2900 0 0.003 0.005 0.002 0.13 4.8 0.007 0.080 0 0.002 1.8OSA17 5.5m 9.5 8.2 0 3200 0 0.003 0.006 0.003 0.15 5.2 0.007 0.076 0 0.003 1.3OSA17 6.0m 8.5 6.8 0 140 0 0.002 <0.001 <0.001 0.47 0.59 0.086 0.098 0 <0.001 1.7

KEY

1 - Laboratory methods described in Acid Sulfate Soils, Laboratory Methods Guidelines , Department of Natural Resources (2004)
















Calculations


Acid Sulphate Soils Investigation

Proposed Blacktip Development

Wadeye, Northern Territory

Table 2 - Area B SPOCAS Analytical Results (Interim)

LAB METHOD1 23A 23B 23F 23Q 23G 23C 23D 23R 23V 23W 23S 23TpH (KCL) pH (OX) TAA ANC(E) TPA S(KCl) S(P) S(RAS) Ca(KCl) Ca(P) Mg(KCl) Mg(P) TSA S(POS) pH diff


OSB18 3.0m 6.6 6.0 0 0 3 0.003 0.001 <0.001 0.052 0.052 0.007 0.008 3 -0.002 0.6OSB20 1.0m 5.7 5.9 8 0 2 0.005 0.005 <0.001 0.007 0.007 0.011 0.013 -5 0.000 -0.2OSB22 1.0m 6.2 5.3 3 0 0 <0.001 0.001 <0.001 0.017 0.021 0.009 0.009 -3 <0.001 0.9OSB23 3.0m 5.8 6.4 5 0 5 0.004 <0.001 <0.001 0.011 0.007 0.015 0.016 0 <0.001 -0.5OSB24 3.0m 5.8 5.8 5 0 3 0.006 0.005 <0.001 0.005 0.012 0.023 0.025 -3 -0.001 0.0OSB25 3.0m 5.9 6.1 5 0 3 0.005 0.003 <0.001 0.006 0.012 0.024 0.026 -3 -0.002 -0.2duplicate of OSB25-3.0) 6.8 6.3 0 0 2 0.003 <0.001 <0.001 0.024 0.042 0.018 0.020 2 <0.001 0.4OSB26 3.0m 5.6 5.9 7 0 4 0.004 0.002 <0.001 0.007 0.006 0.023 0.026 -3 -0.002 -0.4OSB27 3.0m 5.9 6.2 4 0 3 0.004 0.002 <0.001 0.007 0.006 0.021 0.023 -1 -0.002 -0.3OSB28 3.0m 5.6 6.2 6 0 3 0.004 0.003 <0.001 0.002 0.006 0.021 0.022 -3 -0.001 -0.6OSB29 3.0m 5.8 6.2 4 0 5 0.006 0.002 <0.001 0.002 0.007 0.020 0.021 1 -0.004 -0.4

KEY

1 - Laboratory methods described in Acid Sulfate Soils, Laboratory Methods Guidelines , Department of Natural Resources (2004)
















Calculations

SKM SAMPLE REF


Acid Sulphate Soils InvestigationProposed Blacktip DevelopmentWadeye, Northern Territory

Table 3 - Area C SPOCAS Analytical Results (Interim)



NS4 0.2 8.9 7.15 0 80 0 0.024 0.021 <0.001 0.082 0.095 0.038 0.049 0 -0.003 1.7NS6 2.8 6.1 6.14 3 0 3 0.008 0.002 <0.001 0.007 0.009 0.018 0.019 1 -0.006 -0.1NS8 0.8 7.3 6.12 0 0 0 0.021 0.017 <0.001 0.016 0.017 0.038 0.039 0 -0.004 1.2NS10 0.1 8.1 6.95 0 80 11 0.025 0.022 <0.001 0.071 0.10 0.12 0.14 11 -0.003 1.2NS2 2.6 7.1 6.17 0 0 0 0.024 0.021 <0.001 0.013 0.014 0.034 0.035 0 -0.003 0.9

KEY1 - Laboratory methods described in Acid Sulfate Soils, Laboratory Methods Guidelines , Department of Natural Resources (2004)
















Calculations





Appendix C Soil Borelogs


Bore Hole Log

� � � � � �� ! " � # # � � $�% & � ' � � ( �) * +� ( � � � � ( , - � ��. � �/ � � � 0 � � ��1 � � 2�/ 354 6 7 ) * � ( � � � ( � # 8 * " 9 : ; < 8 = > ? � � @ � � � � A � ; " * � * , ��8 # � ( B � � �� ' # * � +� �/ � CD � �E�� F � � �G= * # # * HJI # � $ � � & K $ " H � � �� # � � � * * �� +�� # " L � M � � A � �ON > > P N Q1 A R � M � � � � � � � A�3 � � � �S& . � � � F � A � �OT > P N > Q U� � D � FV/ � CD � � � � � F � � � � � / � � � A � � FWD XYD X0 Z5�[. \ C� � � � � M @ � � D � � � A � ] X ^5�`_5� � � �aX b 2 bc C�d e � � @ � � � A fg h i j k l man o p q r s t u tSo p v w x i m y x j z { m | } l } k i g m5~ i k z { m y x � } y m i k | m � � g } i | m y � z | � g } � m � � �� u r �� u � �

g � m � � j i k ~ � m { | g

t u r �On o p q r s t u r �� { l i m k g m y5� m i l m { | k ~ m } j g � m � � j i k ~ � m { | g x y m l i m k g m y g k { y5� m i l m { | k ~ m�� u � �� u t �

t u �an o p q r s t u �So p v w x � i } � { x j z { m ~ i k z { m y x � m � � g } i | m y � � �� u r �� u t �

t u � �On o p q r s t u � � � � �� u q q�� u � �

q�� } i m5� } g g s�s�s

q u r �On o p q r s q u r � � � �� u � �� u � �

q u �an o p q r s q u � o p v w x ~ i k � m � � � x � m � � } � � } i k { ~ m x � m y z h ��~ i k z { m y5� } } i � � g } i | m y � z | � g } � m � � �� u r q�� u � �z i } { � z m � } � z | m g

q u � �On o p q r s q u � � � � p � x � z { � � z | � i m y � m � � } ��~ i m � � i } � { � } | | � m g x � z ~ � � � k g | z l z | � x g } � m �� u � r�� u r q� k | m i z | m g z { � m z { j } i � k | z } { g � z | � z { l � k �

ran o p q r s r u t s�� u r �� u � �

r u r �On o p q r s r u r � s�� u q r�� u r q

r u ��n o p q r s r u � s�� u � �� u q �

r u � �On o p q r s r u � � s�� u r q�� u r �

�an o p q r s � u t s�� u r �� u � � n ¡�k | � �5� ~ g k g � m i g l } � m } j � } i �¢ o | i m { ~ | � } j ¡ � � i m k l | z } { £ ¤ s ¤ { z � x ¤ � ¤ g � k � � x ¤ � � ¤ � m y z h �5x ¤ � � � ¤ g | i } { ~

Q < Q ¥ < P ¥ ¥ >¦�§ ¥ P N > ¥ ¨ N ¥ ¥

2�� M � � R � � � � A M

I:\\WVES\Projects\WV02732\Technical\Drill Logs.xls


Bore Hole Log

� � � � � �� ! " � # # � � $�% & � ' � � ( �) * +� ( � � � � ( , - � ��. � �/ � � � 0 � � ��1 � � 2�/ 354 © 7 ) * � ( � � � ( � # 8 * " 9 : ; < 8 = ª ? � � @ � � � � A � ; " * � * , ��8 # � ( B � � �� ' # * � +� �/ � CD � �E�� F � � �G= * # # * HJI # � $ � � & K $ " H � � �� # � � � * * �� +�� # " L � M � � A � �ON > > P « >1 A R � M � � � � � � � A�3 � � � �S& . � � � F � A � �OT > P N > Q ª� � D � FV/ � CD � � � � � F � � � � � / � � � A � � F¬D XYD X0 Z5�[. \ C� � � � � M @ � � D � � � A � ] X ^5�_5� � � �aX b 2 bc C�d e � � @ � � � A f~®x ~¯x°�±x

g � m � �j i k ~ � m { | g

t u r �²� } i m5� } g g � � �³� u � �� u � �

o p v w� z ~ � | � i } � { x j z { m | }5l } k i g m ~ i k z { m y x � } y m i k | m � � | }�� } } i � � g } i | m y � z | �t u �an o p q � s t u � z { l i m k g m y ´!} j g � m � � j i k ~ � m { | g � � �³� u � q�� u t q

t u � ��n o p q r � s t u � � � � �³� u � �� u q �

qµn o p q � s q u t � � �³� u � �� u t r

q u r �On o p q � s q u r � � � �³� u � q�� u � r

q u �an o p q � s q u � � � �³� u � r�� u t q

q u � �On o p q � s q u � � � � �³� u � q�� u � �

ran o p q � s r u tS� � p � x ~ i m � � z | � i m y k { y � m � � } �� } | | � m g x � z ~ � � � k g | z l z | � x � z { } i g z � | l } { | m { |±s�� u � �� u � q

r u r �On o p q � s r u r � s�� u � �� u � r

r u ��n o p q � s r u � s�� u � q�� u t �

r u � �On o p q � s r u � � s�� u � r�� u � q

�an o p q � s � u t s�� u � �� u � � n ¡�k | � �5� ~ g k g � m i g l } � m } j � } i �¢ o | i m { ~ | � } j ¡ � � i m k l | z } { £ ¤ s ¤ { z � x ¤ � ¤ g � k � � x ¤ � � ¤ � m y z h �5x ¤ � � � ¤ g | i } { ~

2�� M � � R � � � � A M

Q < Q ¥ < P ¥ ¥ >¦�§ ¥ P N > ¥ ¨ N ¥ ¥

� � y i } g | k | z l m ¶ h z � z � i z h �� } | k � � m � k | m i k y y m y | }5� k z { | k z {



Bore Hole Log

· ¸ ¹ ¹ º »¼ ½¾�¿ À Á Â Ã Ä Å Æ Á�¿ Å Á Ç È É Ê Ë º ¾É Ì Í Î Î º »¼ ½ ¾ Ï�Ð�¿�Ñ Ò Æ Ó Ó Æ Å Ô�Õ Ö È × Ä Å Ø Á ÈÙ Á Ú Û�Á Ø Ã Ä Å Æ Ø Ü Ý ¸ ¼Þ ¸ ¾ß ¸ Í Î à ¸ Ì º�á É ¾ â5ß ã ä å æ Ù Á Ú À Á Ø Ã Å Æ Ø Ä Ó ç Ú Ò Áè Ñ é ê ë ç ì í î · ¸ ï Ê Ë Í ¸ ð ¾ ê Ò Ú Â Ú Ü Á Èç Ó Ä Ø ñ À Æ Â�Ñ Á × Á Ó Ú Â Û�Á Å Àß Ê ò�ó Î ºô�º Ë õ ¸ » ¾öì Ú Ó Ó Ú ÷�ø Ó Æ Ô Ã À Ö ù Ô Á Ò ÷ Æ À Ã�¿ Â Ó Æ À ¿ Â Ú Ú Å�¿ Ä Û�Â Ó Á Ò ú Ê û Ë Í ð ¹ ¾Oü ý ý þ ý ÿá ð � º û Ë Í ¹ Ê Ë Í ¸ ð�ã Ì º Ê ¾ Ö Þ ¸ Ì Ë õ Í ð ¹ ¾�� ý í ü ý ÿ �É º ó Ë õVß Ê ò�ó Î º · Í Ë õ ¸ Î ¸ ¹ ½ ß Ë Ì º ð ¹ Ë õ ó � ó �à �5· Þ � ò�¼ º Ì É º û ï Ì Í ó Ë Í ¸ ð ¸ � � �5·5Ê Ë º Ì�� b â b� ò� � º Ê ï Ë Í ¸ ð �� ! " # $ % � & � % ' #)( ' * � + (,� " - � % ' * � $ ' � � . # " ' * � / ' " 0 . ( - � � . � ' � � �21 � � 354 � � 6

7 # % ' %

� � 8 6,� � � � � � � � 8 6:9 % 7 " ' - . ' * ;,# & . � ' � � & " - � ( ' % . � < # # " � 0 . # " ' * = =>1 � � �54 � � 4

� � 6�� 6 = = =?1 � � �@4 � � A

� � 4 6,� � � � � � � � 4 6 = = =?1 � � 354 � 8 A

�CB # " ' D # . . �E�F�

� � 8 6,� � � � � � � � 8 6 = =>1 � G �HG � A

� � 6�� 6 = = =?1 � � 45G � � �

B D � I � " ' * $ � � � " ' 0 - % * 0 ' � � # $:( # � ' . - % * . " � < ' . � < - " � - � � 0 . " - � & � ' * � � � � �� 4 6,� � � � � � � � 4 6 < � - . � 7 � 0 � . # ( ' � - ' " � ' < � ' 7 ' . � ( # * ' " - ' � 0 . # " ' * �21 � � 15G � 4 8

8�� 8 � � �21 � 8 �@G � A 4

8 � 8 6,� � � � � � 8 � 8 6 �21 � 4 �@4 � � �

8 � 6J� � � � � � 8 � 6KB D � I � " ' * � $ ' � � . # " ' * � � � � � < � - . � 7 � 0 �21 � G �@G � � 3

8 � 4 6,� � � � � � 8 � 4 6 �21 � 8 454 � G 6

A�� A � � �21 � � 354 � � 1L � MN- A ( ! � . - . < ' " . 7 # < ' # & $ # " OP � " ' % � � # & M B D " ' - 7 � # % Q R � R % � � � R = R . ( - � � � R = = R ( ' * � + ()� R = = = R . " # % �

â�¼ û º Ì � Ê Ë Í ¸ ð û

S ë S ÿ ë í ÿ ÿ ýTJU ÿ í ü ý ÿ V ü ÿ ÿ



Bore Hole Log

· ¸ ¹ ¹ º »¼ ½¾�¿ À Á Â Ã Ä Å Æ Á�¿ Å Á Ç È É Ê Ë º ¾É Ì Í Î Î º »¼ ½ ¾ Ï�Ð�¿�Ñ Ò Æ Ó Ó Æ Å Ô�Õ Ö È × Ä Å Ø Á ÈÙ Á Ú Û�Á Ø Ã Ä Å Æ Ø Ü Ý ¸ ¼Þ ¸ ¾ß ¸ Í Î à ¸ Ì º�á É ¾ â5ß ã ä W æ Ù Á Ú À Á Ø Ã Å Æ Ø Ä Ó ç Ú Ò Áè Ñ é ê ë ç ì)S î · ¸ ï Ê Ë Í ¸ ð ¾ ê Ò Ú Â Ú Ü Á Èç Ó Ä Ø ñ À Æ Â�Ñ Á × Á Ó Ú Â Û�Á Å Àß Ê ò�ó Î ºô�º Ë õ ¸ » ¾öì Ú Ó Ó Ú ÷�ø Ó Æ Ô Ã À Ö ù Ô Á Ò ÷ Æ À Ã�¿ Â Ó Æ À ¿ Â Ú Ú Å�¿ Ä Û�Â Ó Á Ò ú Ê û Ë Í ð ¹ ¾Oü ý ý þ � þá ð � º û Ë Í ¹ Ê Ë Í ¸ ð�ã Ì º Ê ¾ Ö Þ ¸ Ì Ë õ Í ð ¹ ¾�� ý í ü ý ÿ üÉ º ó Ë õVß Ê ò�ó Î º · Í Ë õ ¸ Î ¸ ¹ ½ ß Ë Ì º ð ¹ Ë õGó � ó �à �5· Þ � ò�¼ º Ì É º û ï Ì Í ó Ë Í ¸ ð ¸ � � � ·X5Ê Ë º Ì�� b â b� ò� � º Ê ï Ë Í ¸ ð �B # " ' D # . . �

� � 8 6YB # " ' D # . . �

� � 6�� 6 � � � 6Z� � � � � � � � � ! " # $ % � ( ' * � + ([ # 7 # - " . ')� " - � % ' * � < # # " � 0 . # " ' * � 7 # % - � % .\= =]1 � 6 65G � G A. � ' � � & " - � ( ' % .

� � 4 6,� � � � 6 � � � 4 6 � � � � � � " - / ' � � 0 � 7 " ' - ( 7 # � # + " � 7 ' ( ' % ' * � & � % ' # 7 # - " . ' � " - � % ' * . - % * � = = = =^1 � � �@G � � 4. � ' � � & " - � ( ' % . � . " - � & � ' * $ � � . # ( ')� - ' " � � 7 ( - ' " � - �

�_� � � � 6 � � � � = = = =^1 � 4 �@G � 4 �

� � 8 6,� � � � 6 � � � 8 6 = = = =^1 � 8 A5G � 1 8

� � 6�� 6 � � � 6Z� � � � � � � � � ! " # $ % � & � % ' � " - � % ' * � ( # * ' " - ' � 0 . # " ' * = = =`1 � G �@G � 1 A

� � 4 6,� � � � 6 � � � 4 6:a b � c L D � . � ' � � & " - � ( ' % . � . " - � & � ' * � < # # " � 0 . # " ' * � . # ( ' & � % ' # 7 # - " . ' = = = =^1 � 4 �@G � G 6� " - � % ' * . - % * .

8YB # " ' D # . . �

8 � 8 6YB # " ' D # . . �

8 � 6J� � � � 6 � 8 � 6KB D � I � � " ' 0 $ � � " ' * - % * 0 ' � � # $:( # � ' . � � � � � < � - . � 7 � 0 � ( � % # " . � � 7 # % ' % `�d1 � � 654 � � �

8 � 4 6,� � � � 6 � 8 � 4 6 �d1 � 4 �@4 � 8 A

A�� 6 � A � � �d4 � A �@6 � 4 6L � MN- A ( ! � . - . < ' " . 7 # < ' # & $ # " OP � " ' % � � # & M B D " ' - 7 � # % Q R � R % � � � R = R . ( - � � � R = = R ( ' * � + ()� R = = = R . " # % �

â�¼ û º Ì � Ê Ë Í ¸ ð û

þ S ë � ë ÿ ýTJU ÿ í ü ý ÿ V ü ÿ ÿ



Bore Hole Log

· ¸ ¹ ¹ º »¼ ½¾�¿ À Á Â Ã Ä Å Æ Á�¿ Å Á Ç È É Ê Ë º ¾É Ì Í Î Î º »¼ ½ ¾ Ï�Ð�¿�Ñ Ò Æ Ó Ó Æ Å Ô�Õ Ö È × Ä Å Ø Á ÈÙ Á Ú Û�Á Ø Ã Ä Å Æ Ø Ü Ý ¸ ¼Þ ¸ ¾ß ¸ Í Î à ¸ Ì º�á É ¾ â5ß ã ä e æ Ù Á Ú À Á Ø Ã Å Æ Ø Ä Ó ç Ú Ò Áè Ñ é ê ë ç ì ü î · ¸ ï Ê Ë Í ¸ ð ¾ ê Ò Ú Â Ú Ü Á Èç Ó Ä Ø ñ À Æ Â�Ñ Á × Á Ó Ú Â Û�Á Åß Ê ò�ó Î ºô�º Ë õ ¸ » ¾öì Ú Ó Ó Ú ÷�ø Ó Æ Ô Ã À Ö ù Ô Á Ò ÷ Æ À Ã�¿ Â Ó Æ À ¿ Â Ú Ú Å�¿ Ä Û�Â Ó Á Ò ú Ê û Ë Í ð ¹ ¾Oü ý ý ý þ ÿá ð � º û Ë Í ¹ Ê Ë Í ¸ ð�ã Ì º Ê ¾ Ö Þ ¸ Ì Ë õ Í ð ¹ ¾�� ý í ü ý ÿ íÉ º ó Ë õVß Ê ò�ó Î º · Í Ë õ ¸ Î ¸ ¹ ½ ß Ë Ì º ð ¹ Ë õ[ó � ó �à �5· Þ � ò�¼ º Ì É º û ï Ì Í ó Ë Í ¸ ð ¸ � � � ·f5Ê Ë º Ì�� b â b� ò� � º Ê ï Ë Í ¸ ð �

� � 8 6YB # " ' D # . . �g�F�

� � 6YB # " ' D # . . �g�F�

� � 4 6YB # " ' D # . . �g�F�

� � � � � ! " # $ % h 0 ' � � # $ � ( ' * � + ([ # 7 # - " . ')� " - � % ' * � . # ( ' . � ' � � & " - � ( ' % . ��_� � � � G � � � � ! ' 7 # ( � % � 7 # - " . ' " - * ' < � = = =i1 � � �@4 � � 4

� � 8 6,� � � � G � � � 8 6 = =j1 � 8 A54 � � 6

� � 6�� G � � � 6 = =j1 � � 454 � 1 �

� � 4 6,� � � � G � � � 4 6 = =j1 � � 454 � G 8

8�� G � 8 � � =k1 � � �@4 � A �

8 � 8 6,� � � � G � 8 � 8 6 =k1 � � A54 � � �

8 � 6�� G � 8 � 6 =k4 � G 854 � � �

8 � 4 6,� � � � G � 8 � 4 6 =k1 � � 354 � 8 4

A�� G � A � � =k1 � 8 454 � A 6

A � 8 6,� � � � G � A � 8 6 =k1 � 4 854 � � A

A � 6�� G � A � 6 =k1 � 1 354 � 4 4

â�¼ û º Ì � Ê Ë Í ¸ ð û

S ÿ ë S ë í ÿ ÿ ýTJU ÿ í ü ý ÿ V ü ÿ ÿ



Bore Hole Log

· ¸ ¹ ¹ º »¼ ½¾�¿ À Á Â Ã Ä Å Æ Á�¿ Å Á Ç È É Ê Ë º ¾É Ì Í Î Î º »¼ ½ ¾ Ï�Ð�¿�Ñ Ò Æ Ó Ó Æ Å Ô�Õ Ö È × Ä Å Ø Á ÈÙ Á Ú Û�Á Ø Ã Ä Å Æ Ø Ü Ý ¸ ¼Þ ¸ ¾ß ¸ Í Î à ¸ Ì º�á É ¾ â5ß ã ä e æ Ù Á Ú À Á Ø Ã Å Æ Ø Ä Ó ç Ú Ò Áè Ñ é ê ë ç ì ü î · ¸ ï Ê Ë Í ¸ ð ¾ ê Ò Ú Â Ú Ü Á Èç Ó Ä Ø ñ À Æ Â�Ñ Á × Á Ó Ú Â Û�Á Åß Ê ò�ó Î ºô�º Ë õ ¸ » ¾öì Ú Ó Ó Ú ÷�ø Ó Æ Ô Ã À Ö ù Ô Á Ò ÷ Æ À Ã�¿ Â Ó Æ À ¿ Â Ú Ú Å�¿ Ä Û�Â Ó Á Ò ú Ê û Ë Í ð ¹ ¾Oü ý ý ý þ ÿá ð � º û Ë Í ¹ Ê Ë Í ¸ ð�ã Ì º Ê ¾ Ö Þ ¸ Ì Ë õ Í ð ¹ ¾�� ý í ü ý ÿ íÉ º ó Ë õVß Ê ò�ó Î º · Í Ë õ ¸ Î ¸ ¹ ½ ß Ë Ì º ð ¹ Ë õ[ó � ó �à �5· Þ � ò�¼ º Ì É º û ï Ì Í ó Ë Í ¸ ð ¸ � � � ·f5Ê Ë º Ì�� b â b� ò� � º Ê ï Ë Í ¸ ð �

â�¼ û º Ì � Ê Ë Í ¸ ð û

S ÿ ë S ë í ÿ ÿ ýTJU ÿ í ü ý ÿ V ü ÿ ÿ

A � 4 6,� � � � G � A � 4 6 =k1 � � A54 � 6 8

�� G � � � � =k1 � 6 854 � � 4

� � 8 6,� � � � G � � � 8 6 =k1 � 8 �54 � 4 A

� � 6�� G � � � 6 =k1 � � 65G � G 1

� � 4 6,� � � � G � � � 4 6 =k1 � G �@4 � 3 �

6�� G � 6 � �Z� � � � � 7 # - " . ' � " - � % ' * � . ' ( � � 7 ' ( ' % ' * $ � � � " # % 7 ' ( ' % ' *)< � . # � � ' . = =j1 � 8 454 � 6 G

6 � 8 6,� � � � G � 6 � 8 6 1 � A 854 � � �

6 � 6�� G � 6 � 6ZB D � I � < � % O $ � � 0 ' � � # $J- % *)� " ' 0 ( # � ' . � ( # * ' " - ')< � - . � 7 � 0 1 � 3 �@4 � G A

6 � 4 6,� � � � G � 6 � 4 6 1 � A �@G � 1 4

G�� G � G � � 1 � � 65G � 3 6L � MN- G ( ! � . - . < ' " . 7 # < ' # & $ # " O l 8 (,! ' � # $:< " # < # . ' * * � . + " ! - % 7 ' mP � " ' % � � # & M B D " ' - 7 � # % Q R � R % � � � R = R . ( - � � � R = = R ( ' * � + ()� R = = = R . " # % �



Bore Hole Log

· ¸ ¹ ¹ º »¼ ½¾�¿ À Á Â Ã Ä Å Æ Á�¿ Å Á Ç È É Ê Ë º ¾É Ì Í Î Î º »¼ ½ ¾ Ï�Ð�¿�Ñ Ò Æ Ó Ó Æ Å Ô�Õ Ö È × Ä Å Ø Á ÈÙ Á Ú Û�Á Ø Ã Ä Å Æ Ø Ü Ý ¸ ¼Þ ¸ ¾ß ¸ Í Î à ¸ Ì º�á É ¾ â5ß ã ä n æ Ù Á Ú À Á Ø Ã Å Æ Ø Ä Ó ç Ú Ò Áè Ñ é ê ë ç ì o î · ¸ ï Ê Ë Í ¸ ð ¾ ê Ò Ú Â Ú Ü Á Èç Ó Ä Ø ñ À Æ Â�Ñ Á × Á Ó Ú Â Û�Á Å Àß Ê ò�ó Î ºô�º Ë õ ¸ » ¾öì Ú Ó Ó Ú ÷�ø Ó Æ Ô Ã À Ö ù Ô Á Ò ÷ Æ À Ã�¿ Â Ó Æ À ¿ Â Ú Ú Å�¿ Ä Û�Â Ó Á Ò ú Ê û Ë Í ð ¹ ¾Oü ý ý ý o Sá ð � º û Ë Í ¹ Ê Ë Í ¸ ð�ã Ì º Ê ¾ Ö Þ ¸ Ì Ë õ Í ð ¹ ¾�� ý í ü þ � �É º ó Ë õVß Ê ò�ó Î º · Í Ë õ ¸ Î ¸ ¹ ½ ß Ë Ì º ð ¹ Ë õGó � ó �à �5· Þ � ò�¼ º Ì É º û ï Ì Í ó Ë Í ¸ ð ¸ � � � ·X5Ê Ë º Ì�� b â b� ò� � º Ê ï Ë Í ¸ ð �B # " ' D # . ._� # ( ' # " � - % � 7 ( - ' " � - � % # ' * # % . + " & - 7 '

� � 8 6YB # " ' D # . . �p�F�

� � � � � 0 ' � � # $ h ! " # $ % � & � % ' #)( ' * � + (,� " - � % ' * � ( # * ' " - � 0 . # " ' * � . # ( '� � 6�� 4 � � � 6 . � ' � � & " - � ( ' % . � ! ' 7 # ( � % � 7 # - " . ' " � " - � % ' * - * ' < � = = =`1 � 8 Aq�

� � 4 6YB # " ' D # . . = = =r�F�

�_� � � � 4 � � � � = = =`1 � � �@4 � � 4

� � 8 6,� � � � 4 � � � 8 6 = = =`1 � 1 451 � � A

� � 6�� 4 � � � 6 = = =`1 � A 454 � � G

� � 4 6,� � � � 4 � � � 4 6 = = =`1 � � �@4 � 4 A

8�� 4 � 8 � � = = =`1 � G G54 � 1 A

8 � 8 6,� � � � 4 � 8 � 8 6 = = =`1 � 4 454 � G �

8 � 6�� 4 � 8 � 6 = = =`1 � � �@4 � 6 A

8 � 4 6,� � � � 4 � 8 � 4 6 = = =`1 � A G54 � � 3

A�� 4 � A � � = = =`1 � 8 �@4 � � �

A � 8 6,� � � � 4 � A � 8 6 = = =`1 � 4 65G � 4 A

A � 6�� 4 � A � 6 = = =`1 � A �5G � 4 �


â�¼ û º Ì � Ê Ë Í ¸ ð û



Bore Hole Log

· ¸ ¹ ¹ º »¼ ½¾�¿ À Á Â Ã Ä Å Æ Á�¿ Å Á Ç È É Ê Ë º ¾É Ì Í Î Î º »¼ ½ ¾ Ï�Ð�¿�Ñ Ò Æ Ó Ó Æ Å Ô�Õ Ö È × Ä Å Ø Á ÈÙ Á Ú Û�Á Ø Ã Ä Å Æ Ø Ü Ý ¸ ¼Þ ¸ ¾ß ¸ Í Î à ¸ Ì º�á É ¾ â5ß ã ä n æ Ù Á Ú À Á Ø Ã Å Æ Ø Ä Ó ç Ú Ò Áè Ñ é ê ë ç ì o î · ¸ ï Ê Ë Í ¸ ð ¾ ê Ò Ú Â Ú Ü Á Èç Ó Ä Ø ñ À Æ Â�Ñ Á × Á Ó Ú Â Û�Á Å Àß Ê ò�ó Î ºô�º Ë õ ¸ » ¾öì Ú Ó Ó Ú ÷�ø Ó Æ Ô Ã À Ö ù Ô Á Ò ÷ Æ À Ã�¿ Â Ó Æ À ¿ Â Ú Ú Å�¿ Ä Û�Â Ó Á Ò ú Ê û Ë Í ð ¹ ¾Oü ý ý ý o Sá ð � º û Ë Í ¹ Ê Ë Í ¸ ð�ã Ì º Ê ¾ Ö Þ ¸ Ì Ë õ Í ð ¹ ¾�� ý í ü þ � �É º ó Ë õVß Ê ò�ó Î º · Í Ë õ ¸ Î ¸ ¹ ½ ß Ë Ì º ð ¹ Ë õGó � ó �à �5· Þ � ò�¼ º Ì É º û ï Ì Í ó Ë Í ¸ ð ¸ � � � ·X5Ê Ë º Ì�� b â b� ò� � º Ê ï Ë Í ¸ ð �


â�¼ û º Ì � Ê Ë Í ¸ ð û

A � 4 6,� � � � 4 � A � 4 6 = = = =^1 � 4 354 � � A

�� 4 � � � � �d1 � � �@4 � � �� 7 # - " . ' � " - � % ' * � . ' ( � � 7 ' ( ' % ' * � . # ( ')� " # % < � . # � � ' .

� � 8 6,� � � � 4 � � � 8 6 �d1 � 1 �@4 � G 6

� � 6,� � � � 4 � � � 4 6 �d1 � � A5G � 1 A

� � 4 6 � � � � 4 � � � 4 6 � 1 � A � 4 � G 44 � � �

6 � � �� 4 � 6 � �Z� � � � � . � � 0 � & � % ')� " - � % ' * � $ ' � � . # " ' * �d1 � � �@4 � � G

6 � 8 6,� � � � 4 � 6 � 8 6 �p�s4 � � G

6 � 6�� 4 � 6 � 6Z� � � � � � " - / ' � � 0 � 7 # - " . ' � " - � % ' * �d1 � � �@4 � � G

6 � 4 6,� � � � 4 � 6 � 4 6JB D � I � < � % O $ � � 0 ' � � # $J- % *)� " ' 0 ( # � ' . � ( # * ' " - ')< � - . � 7 � 0 �p�s4 � � G

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Bore Hole Log

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I:\WVES\Projects\WV02732\Deliverables\Reports\R01sjsCM (V02).doc PAGE38

Appendix D Laboratory Reports




Appendix E Site Photographs

Acid Sulphate Soil Investigation Woodside Energy LimitedProposed Blacktip DevelopmentWadeye, Northern Territory

I:\WVES\Projects\WV02540.500\Deliverables\Photos.doc

Plate 1: Drilling at location OSA12 (Geotechnical Bore ID: P/BH4).

Plate 2: Looking east from OSA13 (Geotechnical Bore ID: P/BH3) towardsthe beach area.



Plate 3: Core collection from OSA14 (Geotechnical Bore ID: P/BH2); 1.0 -2.0 mbgs.

Plate 4: Core collection from OSA14 (Geotechnical Bore ID: P/BH2); 2.0 -3.0 mbgs.



Plate 5: Logging and collection of geotechnical samples - beach area.

Plate 6: Drilling of OSA17 (Geotechnical Bore ID: P/BH6) near the tree-line.



Plate 7: View of Area C, looking west towards LAT.



Plate 8: Core collection from OSA17 (Geotechnical Bore ID:P/BH6); 5.0 -6.0 mbgs.

Plate 9: View into test pit location OSB18 (Geotechnical Bore ID: P/TP14)along the proposed pipeline corridor of Area B.



Plate 10: Soils removed from OSB18 (Geotechnical Bore ID: P/TP14).

Plate 11: Backhoe digging test pit location OSB20 (Geotechnical Bore ID:P/TP12) within Area B.



Plate 12: Completed test pit OSB20 (Geotechnical Bore ID: P/TP12) alongthe proposed pipeline corridor of Area B.

Plate 13: Measurement of test pit depth at OSB20 (Geotechnical Bore ID:P/TP12).



Plate 14: Sample collection for field tests and laboratory analysis.

Plate 15: Drilling of OSB25 (Geotechnical Bore ID: G/BH2) within theproposed plant site (Area B).



Plate 16: Core collected and sampled from the proposed plant site (Area B).

Plate 17: Setup of test kit used for ASS field testing.



Plate 18: SKM Field Scientist completing field tests for ASS samples.

Documents

Woodside Energy Limited Proposed Blacktip Development ... · naturally acidic soils at depth and materials, should they be potentially in contact with naturally acidic soils, should