application documentation 2

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TRIAL PIT INVESTIGATION- ONGOING SITE INVESTIGATION

Thornton Power Station,Thornton-Cleveleys

REC Report 43391August 2010

Prepared for

Ballard Propertiesc/o Plan A-Design86 Church Lane

CulchethWarringtonWA3 5DJ

By

REC LtdOsprey HousePacific Quay

BroadwayManchesterM50 2UE

Telephone 0161 868 1300 Fax 0161 868 1301Website www.recltd.co.uk

Resource & Environmental Consultants Ltd


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I

QUALITY ASSURANCE

Issue/revision Issue 1 Revision 2 Revision 3

Remarks Draft

Date August 2010

Prepared by M Wright

Signature

Checked by A Edgar

Signature

Authorised by M Wright

Signature

Project number 43391


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Trial Pit Investigation August 2010Former Power Station, Thornton Cleveleys 43391p1r0

II

EXECUTIVE SUMMARY

Context

The current site owners, Ballard Properties wish to sell the land of the former Thornton

power station for residential redevelopment. In order to determine the nature of anyenvironmental risk at the site and provide clear guidance to any future buyer as to the statusof the site, Ballard Properties have commissioned REC to undertake a series of siteinvestigations using a scope previously agreed with Wyre Borough Council, of which this isthe first phase. The next phase is a groundwater investigation with ongoing gas monitoring.

The results of the investigation will then be provided to the council to accelerate any futuredecisions regarding planning and outstanding issues. This report should be read inconjunction with REC’s March 2007 geo-environmental Investigation, a copy of which isincluded on the CD attached to the rear of this report.

Conceptual Site Model

Following earlier investigations and a review of development requirements (raising land levelby 1.0m from current), the only realistic exposure pathways will be from volatile compoundsgenerating a vapour risk or soluble hydrocarbons or metals leaching to groundwater andmigrating towards and off-site surface water bodies. Unless significant solvents or PCBconcentrations are present the risk of downward migration to the minor aquifer is negligible.

Exploratory Investigation

Ground Conditions

Made Ground was encountered in all exploratory hole locations from ground level to amaximum proven depth of 2.3m though deeper made ground is likely to exist. The MadeGround comprises 6F2 type crushed demolition rubble of between 0.4m and 1.0m placedafter the recent works, overlying gravelly clay with cobbles of brick, concrete, sandstone andgravels. In addition, pockets of a medium sand type coal was also encountered, typicallyused as a backfill. The Made Ground is thicker in the northern third of the site and to theimmediate north of the Ballard Building.

Underlying natural drift deposits generally comprised silty sands and sandy clays of marineand estuarine origin.

Bedrock was not encountered and has not previously been encountered within the first

10.45m. The site overlies the Kirkham Mudstones which are classified as a minor aquifer.

Tier 1 Risk Assessment

The Tier I Human Health Risk Assessment has determined that there are while there are 6exceedances of the Tier 1 screening values, five of those are for dermal contact andingestion in soils that will be at least 1.0m bgl. The only realistic exceedance where a viablepathway exists is for naphthalene in two areas, the Former Electrical Transfer Station and tothe immediate north of the Ballard Building. Naphthalene was only detected at a maximumconcentration of 2.8mg/kg compared to a Tier 1 value of 1.5mg/kg for residentialdevelopment.


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III

Some more soluble compounds have been identified on site and risk to controlled waters,and risk from vapours from groundwater must therefore be reviewed.

Recommendations

A groundwater investigation will be completed in line with the scope previously agreed withthe council. This will review risk to controlled waters as well as vapour risk to future siteusers.

Given that there is organic matter in the Made and natural ground, a preliminary ground gasinvestigation should be completed. Rather than necessarily completing a specific number ofvisits, an initial 6 visits will be carried out followed by a review and recommendations forcontinuous sampling if necessary.


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IV

TABLE OF CONTENTS

QUALITY ASSURANCE I EXECUTIVE SUMMARY II

TABLE OF CONTENTS IV 1.0 INTRODUCTION 1

1.1 Background 1 1.2 Proposed Development 1 1.3 Objectives 1 1.4 Sources of Information 2 1.5 Limitations 2

2.0 INITIAL CONCEPTUAL SITE MODEL (ICSM) 3 2.1 Source Areas of Potential Concern and Associated Chemicals 3 2.2 Pathways 3 2.3 Receptors 4 2.4 Complete Source Pathway Receptor Linkages 4 2.5 Conclusions 6

3.0 SITE SETTING 7 3.1 Site Description 7 3.2 Current Site Use 7 3.3 Surrounding Area 8

4.0

SITE INVESTIGATION 9

4.1 Exploratory Fieldwork 9 4.2 Summary of Site Investigation Observations 10

4.2.1 Ground Conditions 10 4.2.2 Groundwater Conditions 10

4.3 Laboratory Testing Programme 11 5.0 TIER 1 HUMAN HEALTH RISK ASSESSMENT 12

5.1 Soil Guideline Values 12 5.1.1 Human Health Risk Assessment – Soil 15

5.2 Controlled Water Risk Assessment 15 5.3 Ground Gas Assessment 15

6.0 REVISED CONCEPTUAL SITE MODEL 16 7.0 CONCLUSIONS & RECOMMENDATIONS 17

APPENDICES

Appendix I GlossaryAppendix II LimitationsAppendix III Figure 1 Site Location Plan

Figure 2 Former Site Layout

Figure 3 Trial Pit Location Plan


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V

Appendix IV Approved Scope of Work 2007Appendix V REC Trial Pit LogsAppendix VI Chemical Testing Results 2010Appendix VII Origin of Tier I ValuesAppendix VIII March 2007 Shallow Soils Laboratory Analytical Results.

A CD containing a complete PDF version of this report is attached to hard copy of thereport. Copies of the 2007 REC Reports 42614p1r0 (Desk Study) and 42614p2r0 (geo-Environmental Investigation) are also saved on the CD.


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1

1.0 INTRODUCTION

1.1 Background

Resource and Environmental Consultants Ltd (REC) have been commissioned by Plan A

Design, acting on behalf of Ballard Properties, Gibraltar, to undertake a staged intrusiveinvestigation in line with the proposed investigation originally approved by Wyre BoroughCouncil (WBC) and the Environment Agency (EA) in January 2008 (REC ref: 23p42444,dated December 2007). A copy of the proposed work is included in Appendix IV; thisincludes a site plan showing former activities and proposed investigation locations for trialpits and probeholes.

A variation has arisen at the site since the 2007 proposal as the site had been demolishedat the time of this investigation; demolition crews assisted in the location of all formerfacilities. This report covers the initial trial pitting investigation carried out to determine theshallow impact across the site and to tie in with existing investigation information from earliersite works carried out by REC.

The scope of work consisted of the excavation of 23 trial pits across the site at previouslyidentified areas of concern where activities could have lead to contamination of the soils withvarious compounds. The results of the trial pit investigation will be used to direct a separateborehole investigation designed to determine the impact to groundwater across the site.

All acronyms used within this report are defined in the Glossary presented in Appendix I.

1.2 Proposed Development

Ballard Properties wish to sell the site for residential development. The purpose of this

report is to provide the purchaser with a degree of confidence in the site and an idea of anyoutstanding costs that may be incurred redeveloping the site and satisfying any conditionsapplied by either the WBC or EA.

1.3 Objectives

The objectives of the trial pit investigation are to:

• Establish ground conditions across the site post-demolition;

• Undertake a preliminary stage of sampling and analysis to provide an overview ofenvironmental issues identified in the December 2007 scope of work;

• Assess the implications of any potential environmental risks, liabilities and developmentconstraints associated with the site in relation to the future use of the site and in relationto off-site receptors;

• Provide a factual and interpretative report relating to the site investigation and providepreliminary recommendations on any outstanding issues that may affect the future sale;and,

• Assess the likely costs of future works required to meet any further planning conditions.


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1.4 Sources of Information

Background information was sought from the Geo-Environmental Investigation Reports,Proposed Residential Development, Bourne Road REC Report 42444p3r0 dated April andMay 2007

1.5 Limitations

The limitations of this report are presented in Appendix II.


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2.0 INITIAL CONCEPTUAL SITE MODEL (ICSM)

The 2007 scope of work was developed following an assessment of the site in line withCLR11. This ICSM was developed following a review of the site history, various sitewalkovers and the results of two phases of intrusive investigation. This ICSM has also been

developed bearing in mind that the site level will need to be raised 1.0m from existing, postdemolition, levelled topography.

2.1 Source Areas of Potential Concern and Associated Chemicals

The scope of work was developed following provision of a former works drawing whichidentified nine specific areas of concern and associated chemicals. These are:

1. Black Oil Tanks – black oil for power generation;

2. Coal Conveyor Housing and Associated Oil Filled Manholes – coal dust/granularmaterial (and associated metals) and associated machine oils;

3. Zinc and Phosphate Tanks – metallic powders;

4. Ballard Building – small diesel tank and connections to the black oil tanks (above groundfeed);

5. Electrical Transfer Station – transformer oils and possibly PCBs;

6. Former Transformer Station – transformer oils and PCBs;

7. Caustic, Acid and Diesel Tanks – Caustic soda, acids, and diesel which could inter-react

to generate semi volatile chlorinated solvents (SVOCs);

8. Effluent Pit for site drainage – all surface water run-off and site waters were processedthrough this pit prior to discharge. Chlorinated solvents for cleaning were believed to beused on site and could have discharged via this structure; and

9. Day Oil Storage – solvents (VOCs) used for cleaning were stored here as was a black oilday tank used to supply the generators.

In addition to these specific areas, the site has been historically raised and as such there isa risk that Made Ground could contain elevated metals concentrations or organic matterwhich may generate ground gas. In addition, the degradation of certain hydrocarbon oils

and chlorinated compounds can also generate ground gases such as methane and carbondioxide.

2.2 Pathways

The chemicals of potential concern range from the more volatile degreasing chlorinatedsolvents to the viscous black oil and dense PCBs. The likely pathways for exposure andrisk to human health are therefore:

• Inhalation of vapours from solvents and the lighter fractions of diesel (C6-10) in outdoorand indoor air environments;

• Dermal contact and ingestion of aromatic and aliphatic hydrocarbons, semi-volatile andvolatile chlorinated solvents, heavy metals and PCBs in soils and home grownvegetables;


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• Soluble and separate phase compounds leaching to controlled surface andgroundwaters;

• Dermal contact and ingestion of impacted controlled waters;

• Phytotoxic impact to vegetation from particular metals; and

• Ground gas infiltration into buildings and voids generating potentially toxic or explosive

conditions.

2.3 Receptors

The proposed development is residential. The receptors are therefore:

• Infants exposed to soil ingestion, dermal contact, vegetable uptake (with associatedsoils) and inhalation of hydrocarbon vapours both indoors and outdoors, along with dustimpacted by heavier oils or heavy metals;

• Construction workers exposed to dermal contact and ingestion of organic and inorganicimpacted soils, contaminant and ground gas vapours within trenches and manholes, andinhalation of dust impacted by heavy metals;

• Groundwaters impacted by leaching from unsaturated soil and downward migration ofdissolved phase hydrocarbon and dissolved metals plumes from perched waters tounderlying aquifers. Earlier investigations have reported site geology to consist ofmarine and estuarine alluvium over Kirkham Mudstones which are classified as a MinorAquifer. Completed investigations have identified low permeability sediments to 10.45mbgl including stiff slightly sandy or gravelly clay from approximately 7.5m to 10.45m.

• Hydrocarbon and heavy metals dissolved phase impact to surface waters; and

• Impact to utilities which come into contact with the various hydrocarbons and could eitherbe damaged or act as migration pathways for either vapours or liquid/dissolved phasemigration.

2.4 Complete Source Pathway Receptor Linkages

In assessing the complete linkages for the site, the development program must be takeninto account. In order for the site to be developed, it must be raised from the existing levelsby 1.0m. This will mean the placement of at least 0.4m of cap before any materials areimported for use in gardens. The cap will be validated to show it is suitable for use anddevoid of asbestos, and there are no volatile or semi-volatile hydrocarbons or heavy metalspresent that could generate a risk to human health or the environment.

As a direct result of the cap, there will be no accessible soils on the development within theupper 1.0m that could generate any risk through dermal contact or ingestion. Consequently,any hydrocarbon range (either aliphatic or aromatic) >C10 and any SVOCs (>C10) along withPCBs and heavy metals (with the exception of elemental mercury), will not pose a risk to thefuture residents. In addition, the use of basic PPE will remove the risk to any constructionworker from these heavier hydrocarbons.

The complete linkages during and post-development are outlined in Table 2.1.


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Table 2.1 Identified Linkages for Human Exposure

SourceExposurePathway

PotentialReceptor

Probabilityof Exposure

Discussion of Pollutant Linkage

Human Health

All hydrocarbons and

heavy metals

Dermalcontact andingestion

ResidentsandConstruction

workers

Low

Residents will be protected from anyimpacted soils by the placement of a

cap and the existing break layer.Construction workers using basicPPE and hygiene will not beexposed to any significant risk -UNLIKELY

Residentsindoors

Moderate tolow

While these hydrocarbons may bepresent, it would be typical on abrownfield site with made ground toneed to install a vapour membrane.Providing concentrations are notelevated, this would not necessarilyneed to be chemical resistant.LIKELY

Residentsoutdoors

Low

Given the dilution of the vapours,

exposure could be limited to shedsand protected areas but generallythis is UNLIKELY.

Hydrocarbons in soils –

diesel (


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SourceExposurePathway

PotentialReceptor

Probabilityof Exposure

Discussion of Pollutant Linkage

Downwardmigration tothe Minor

Aquifer fromthe shallowgroundwater

Minor

Aquifer

Low

Chlorinated solvents need to bepresent in separate phase toovercome any interstitial resistancewhile PCBs also have to be present

in sufficient quantity to migratedownwards. Historical investigationshave not identified such impact.UNLIKELY

2.5 Conclusions

With the site capped, only vapour intrusion from contaminants and ground gas, anddissolved phase impact to controlled waters are likely to generate any significant risk tohuman health or the environment. This phase of investigation has been designed todetermine the likely risk of vapours from the soils and upper saturated zone, and the risk tocontrolled waters.


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3.0 SITE SETTING

3.1 Site Description

Site Address Former Power Station, Bourne Road, Thornton

National Grid Reference E333830 N444190

Site Area 121.5ha

Current site location map and former site layout plan are presented in Appendix III as Figure1 and 2.

3.2 Current Site Use

The site was demolished in the first half of 2010 with the asbestos remediation completed atan earlier date. All concrete and brick was processed on site and used to raise the level ofthe site and remove any depressions or low spots. This involved significantly increasing theheight of the northern sector previously occupied by the fuel storage and delivery area to thenorth of the site.

Site Description

The site is roughly rectangular in shape, narrowing to the south. Formerly the centre of thesite was occupied by the main power station with support buildings and infrastructure mainlyto the north and east. The site is currently flat, capped with 6F2 type material, with theexception of the Ballard Building which contains an oil powered generator. The only other

feature of note is an impacted ditch to the northwest of the Ballard Building which wasimpacted by a line leak. There is still evidence of impact to the sides of the ditch. The ditchshallows to the south, running just west of the Ballard Building and a former diesel tank.There is no evidence of impact in the southern part of the ditch.

The former power station was originally coal fired but then black oil, stored in the two formerlarge vertical tanks at the northern boundary was used to run the Ballard Building generator.Animal tallow was also reportedly used at one stage.

Hazardous Materials Storage

Previous reports identified various contaminants on site ranging from diesel, transformer

oils, black oil, some cleaning solvents and combinations of the two which may havegenerated semi-volatile chlorinated solvents.

Polychlorinated Biphenyls (PCBs)

The transformers located to the south of the main building had been operation before thePCB ban. These oils were known to have been spilled during vandalism of the site whenunoccupied. The demolition works included pumping out shallow chambers and disposingof oils within said chambers. However, impact to ground was known to have occurred.


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Waste Storage

Only limited waste was ever stored on site, as most products imported were combusted aspart of the electrical generation process. There is no evidence of ash having been stored onsite but coal dust/fines were present. There was some waste storage in a drum area but

this was limited to 200 litre drums and there was no evidence of an historical loss in thisarea. However this Day Oil Storage area was identified as requiring further investigation.

Drainage Issues

A drainage survey was not undertaken as part of the site walkover. Former drainsdischarged to various locations, one of which is a partially above ground separator locatedoff-site to the north of the Ballard Building. All other drains across the site have beendestroyed or damaged during the demolition process.

Asbestos Containing Materials (ACMs)

Pre-demolition, during ecological surveys for bats, significant asbestos containing materialswere identified. These were removed in 2008, prior to any demolition. The site was clear ofall asbestos when demolished. During site works, no evidence of buried asbestos wasobserved in the Made Ground beneath the recently laid 6F2 type material.

3.3 Surrounding Area

The REC 42444p3r0 report which includes the desk study for this site is included on the CDat the rear of this report. The report identifies former ICI works to the east and north withresidential properties to the west and south.


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4.0 SITE INVESTIGATION

The original proposed investigation consisted of 22 trial pits but the final number of locationsexcavated was 25. The trial pits were excavated over a series of site visits utilisingcontractor machinery.

4.1 Exploratory Fieldwork

The full trial pit exploratory fieldwork was completed on 22nd

June 2010. The works aresummarised in Table 3.1.

Table 4.1 Summary of Fieldwork

Investigation Method No. of

Positions

Location References Maximum Depth

(m bgl)

Monitoring

Wells

Trial Pit Locations23

TP301-TP323

TP324 and TP325

2.5

1.9NA

Notesm bgl – metres below ground level.

The trial pits were located to provide environmental information to investigate the potentialsources and pathways for contamination identified within 2007 proposed scope of work.The trial pit locations were chosen according to the 2007 scope which was based on nineidentified potential areas of concern.

The trial pit locations are illustrated in Figure 3 (Appendix III) along with the historicalborehole, window sample and trial pit locations.

The ground conditions encountered and details of monitoring well response zones areindicated on the logs which are provided in Appendix V.

Soil samples destined for chemical analysis were collected at regular intervals in appropriatesampling containers. All samples were subsequently stored in cooled boxes prior tosubmission to Scientific Analysis Laboratories (SAL) for analysis in accordance with theirUKAS accreditation where applicable.

All samples were collected using appropriate PPE and sampling equipment that wascleaned at each sampling location.

A detailed copy of REC Ltd sampling methodology, QA procedures and laboratory chain of

custody forms can be provided upon request.


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4.2 Summary of Site Investigation Observations

4.2.1 Ground Conditions

Made Ground

Having crushed all site materials, the majority of the site is now covered by 6F2 type rubbleof brick, concrete and occasional stone. Only the land to the very south of the site andalong the western periphery is not covered by this material. There is a mound of thismaterial still left on-site. Beneath the recently laid crushed demolition material is a MadeGround of predominantly clay with various percentages of silt, sand and gravels. Inaddition, historical excavations such as for sub-surface utility installation or around repairshave been backfilled with a black medium to fine sand of coal. Samples of this materialwere identified and collected for analysis.

The Made Ground across the northern end of the site typically extends to between 1.5m to

2.3m bgl with historical structures usually governing the locations of the deeper MadeGround. Along the western boundary, just north of the Ballard Building, a number ofexcavations encountered consistently deep Made Ground. The Made Ground consisted ofrailway sleeper timbers and concrete slabs, as well as historical wiring, pipes and drains andan occasional ruptured, partially crushed drum. The sleepers had a strong kerosene odourand were below groundwater.

To the south of the site, with the exception of around the former effluent pit (2.1m bgl), thedepth of Made Ground was typically proven to between approximately 1.0m and 1.6m bgl.

Drains were encountered sporadically across the site, installed within the Made Ground.

Typically they contained a relatively small amount of water but oil sheens were observed ata number of locations, TP315, TP316 and TP319 (250mm clay pipe with visible transparentoil drops on the water).

Natural Strata

Underlying natural drift deposits generally comprised a mixture of lithologies with the MadeGround variously overlying typically compact or firm silty fine Sand, sandy Clays, clayeySands but occasionally also soft to firm Clays and silty Clays. There was little consistencyacross the site.

Bedrock was not encountered.

4.2.2 Groundwater Conditions

Other than from occasional drainage pipes or pockets within permeable backfill (now thesite has no hard-surfacing), the only groundwater entries observed were typically associatedwith the interface between Made Ground and the more clayey natural strata. The depthsvaried according to the thickness of the Made Ground but there was evidence within theoverlying strata that standing water levels would typically be around 1.0m bgl.


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4.3 Laboratory Testing Programme

Selected soil samples were submitted for a range of analysis comprising, metals, pH, totalsulphate, water soluble sulphate (2:1 extract), sulphide, cyanide, phenols, speciated poly-

aromatic hydrocarbons (PAHs), organic carbon and total plus speciated petroleumhydrocarbon (with and without BTEX) (TPH, SpTPH Ali/Aro and SpTPH CWG). In additionsamples were analysed for volatile and semi-volatile organic compounds and PCBs (EC7).

Scientific Analysis Laboratories (SAL) Ltd of Manchester undertook the analytical work andthe testing results are included in Appendix VI.


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5.0 TIER 1 HUMAN HEALTH RISK ASSESSMENT

5.1 Soil Guideline Values

REC has undertaken a Tier 1 human health risk assessment to determine if any potential

contaminants within the underlying soils and groundwater pose an unacceptable level of riskto the identified receptors.

At a Tier 1 stage the long term (chronic) human health toxicity of the soil has been assessedwith reference to EA Contaminated Land Exposure Assessment (CLEA) Soil GuidelineValues (SGV) and where absent, General Acceptance Criteria (GACs) published byLQM/CIEH (2

nd edition).

The results of this comparison have been summarised within Table 5.1 (overleaf).

An earlier investigation completed in March 2007 and reported in REC report 42614p2r0also included a Tier 1 human health risk assessment. A copy of that report is included on

the CD attached to the rear of the hard copy. The investigation locations are included onFigure 3 in Appendix III and the laboratory soils analytical results are included in AppendixVIII. Given that GAC values have changed, REC has re-reviewed the data for the volatilefractions given that this is the most likely realistic exposure pathway.


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In addition to the listed compounds, REC also analysed for the SVOC and VOC in select soilsamples at locations identified within the 2007 scope of works. The analysis for VOCs didnot detect any VOCs while the analysis for SVOCs only detected low concentrations ofPAHs.

5.1.1 Human Health Risk Assessment – Soil

For the purposes of the Tier 1 assessment REC have compared the laboratory test datadirectly to the relevant Tier 1 GAC value for the protection of human health. In total therewere six exceedances of the Tier 1 values. However, of those six, four are based oningestion and since the site will have a significant protective cap, no pathway actually exists.

The only compounds for which there was an exceedance, based on indoor air inhalationwere naphthalene in WS205 in shallow soil (0.5mbgl) and aliphatic C10-12 in TP303 at1.9mbgl. The impact in WS205 was not reflected in the deeper samples of the 2010investigation or other samples from 2007.

The impact in TP303 was not identified laterally to the north or east, which mark the northside and adjacent locations to the former conveyor housing. Further delineation is requiredin this area to determine whether this is an actual risk. This will include monitoring of in-situvapour concentrations and an assessment of the depth to groundwater. Impact beneath thesaturated zone can only volatilise from dissolved phase and as such, an assessment of thedissolved phase in this area will provide further information regarding the possible risk.

5.2 Controlled Water Risk Assessment

Lighter, soluble fractions of fuel range hydrocarbons have been detected on-site and agroundwater investigation will be required to determine the risk presented by the identifiedimpact. This investigation will include dissolved metals and PCBs.

5.3 Ground Gas Assessment

The initial conceptual site model identified the following possible sources of ground gas thatmay affect the subject site:

• Made Ground associated with historical site raising and construction/demolitionactivities.

As part of a groundwater investigation, the monitoring wells will also be gauged for groundgases and gas flow rates.


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6.0 REVISED CONCEPTUAL SITE MODEL

Following the completion of the trial pit investigation, chemical analysis and assessment,REC Ltd has identified only one potentially significant pollutant linkage based on aresidential redevelopment of the site. Further work is proposed to investigate this linkage as

well as determine the risk to controlled waters across and beyond the site.

Based on the soils investigation carried out to date, there is no significant impediment to theresidential redevelopment of the site.


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7.0 CONCLUSIONS & RECOMMENDATIONS

Environmental

The Tier I Human Health Risk Assessment has determined that there is only one location

where volatile organic hydrocarbons are present that could generate a risk to human healththrough indoor air inhalation. However, further work is required to confirm the extent of theimpacted area as well as complete general site coverage. As a result of the cap that will beplaced to raise the site, providing any imported material is suitably screened, there is are nounacceptable concentrations of potential contaminants within the underlying soils that wouldpose a potential risk to human health of future site occupants or controlled waters.

Given the organic materials (debris) identified during the investigation, a ground gasinvestigation will also be required.

Recommendations

An intrusive investigation comprising the installation of environmental monitoring wells isrequired to determine impact to groundwater across the site from the more solublecompounds and to determine what potential risk they pose as a source of vapours. Theinstallation of wells will also allow a full assessment of the ground gas regime.

Since the site has been demolished, certain wells that were proposed as augmenting the2007 proposal have been destroyed and consequently some additional wells on top of theproposed 15 should be installed. Once the data is available, further investigation to finalisedelineation may be required.


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APPENDIX I

GLOSSARY


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TERMSAST Above ground Storage TankUST Underground Storage TankEA Environment AgencyCSM Conceptual Site Model

GL Ground LevelND Not DetectedNR Not RecordedBSI British Standards InstituteBGS British Geological SurveyCLEA Contaminated Land Exposure AssessmentSGV Soil Guideline ValueGAC General Assessment CriteriaCIEH Chartered Institute of Environmental HealthPID Photo Ionisation DetectorCIRIA Construction Industry Research AssociationGSV Gas Screening Value

EQS Environmental Quality StandardDWS Drinking Water StandardPAH Poly Aromatic HydrocarbonTPH (CWG) Total Petroleum Hydrocarbon (Criteria Working Group)VOC Volatile Organic CompoundSVOC Semi Volatile Organic CompoundSPT Standard Penetration TestVCCs Vibro Concrete ColumnsQA Quality Assurance

UNITSm Metreskm Kilometres% Percent%v/v Percent volume in airmb Milli Bars (atmospheric pressure)1/hr Litres per hourµg/l Micrograms per Litre (parts per billion)ppb Parts Per Billionmg/kg Milligrams per kilogram (parts per million)ppm Parts Per Millionmg/m

3 Milligram per metre cubed

m bgl Metres Below Ground Levelm bcl Metre Below Cover LevelmAOD Metres Above Ordnance Datum (sea level)kN/m

2Kilo Newtons per metre squared

µm Micro metre


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APPENDIX II

LIMITATIONS


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1. This report and its findings should be considered in relation to the terms of reference and objectives agreedbetween REC Ltd and the Client as indicated in Section 1.2.

2. For the work, reliance has been placed on publicly available data obtained from the sources identified. Theinformation is not necessarily exhaustive and further information relevant to the site may be available fromother sources. When using the information it has been assumed it is correct. No attempt has been made toverify the information.

3. This report has been produced in accordance with current UK policy and legislative requirements for landand groundwater contamination which are enforced by the local authority and the Environment Agency.Liabilities associated with land contamination are complex and requires advice from legal professionals.

4. During the site walkover reasonable effort has been made to obtain an overview of the site conditions.However, during the site walkover no attempt has been made to enter areas of the site that are unsafe orpresent a risk to health and safety, are locked, barricaded, overgrown, or the location of the area has not bemade known or accessible.

5. Access considerations, the presence of services and the activities being carried out on the site limited thelocations where sampling locations could be installed and the techniques that could be used.

6. In addition to the above REC Ltd note that when investigating, or developing, potentially contaminated land

it is important to recognise that sub-surface conditions may vary spatially and also with time. The absenceof certain ground, ground gas, and contamination or groundwater conditions at the positions tested is not aguarantee that such conditions do not exist anywhere across the site. Due to the presence of existingbuildings and structures access could not be obtained to all areas. Additional contamination may beidentified following the removal of the buildings or hard standing.

7. Site sensitivity assessments have been made based on available information at the time of writing and areultimately for the decision of the regulatory authorities.

8. Where mention has been made to the identification of Japanese Knotweed and other invasive plant speciesand asbestos or asbestos-containing materials this is for indicative purposes only and do not constitute orreplace full and proper surveys.

9. The executive summary, conclusions and recommendations sections of the report provide an overview andguidance only and should not be specifically relied upon without considering the context of the report in full.

10. This report presents an interpretation of the geotechnical information established by excavation, observationand testing. Whilst every effort is made in interpretative reporting to assess the soil conditions over the Siteit should be noted that natural strata vary from point to point and that man made deposits are subject to aneven greater diversity. Groundwater conditions are dependent on seasonal and other factors.Consequently there may be conditions present not revealed by this investigation.

11. REC can not be held responsible for any use of the report or its contents for any purpose other than that forwhich it was prepared. The copyright in this report and other plans and documents prepared by REC isowned by them and no such plans or documents may be reproduced, published or adapted without writtenconsent. Complete copies of this may, however, be made and distributed by the client as is expected indealing with matters related to its commission. Should the client pass copies of the report to other parties forinformation, the whole report should be copied, but no professional liability or warranties shall be extendedto other parties by REC in this connection without their explicit written agreement there to by REC.

12. Rather, this investigation has been undertaken to provide a preliminary characterisation of the existing sub-surface geotechnical characteristics and make up and the findings of this study are our best interpretation ofthe data collected, within the scope of work and agreed budget. New information, revised practices orchanges in legislation may necessitate the re-interpretation of the report, in whole or in part.

13. This investigation has been undertaken to reasonably characterise existing sub-surface conditions and thefindings of this study are our best interpretation of the data collected, within the scope of work and agreedbudget. New information, revised practices or changes in legislation may necessitate the re-interpretation ofthe report, in whole or in part.


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APPENDIX III

FIGURES


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APPENDIX IV

2007 SCOPE OF WORK – REC 23P42444


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ADDITIONAL PHASES OF INVESTIGATIONPROPOSED RESIDENTIAL DEVELOPMENT, BOURNE ROAD, THORNTON

Introduction

A way-forward meeting was held on 11 December 2007 at the NPL Estates office at HillHose! "hornton to discss what information was needed to #ro$ide the reglatoryathorities with sfficient confidence to a##ro$e conditional #lanning for the #ro#osed

residential de$elo#ment %and associated wor&s' referenced abo$e( "he meeting wasattended by re#resentati$es of the En$ironment Agency %EA' %)tart *cDonald'! theen$ironmental health de#artment %EHD' %+orinne *ason' and their consltants! Encia %PhilHill'! NPL Estates %)imon "owers'! *iller Homes %*i&e ,owman' and E+ Limited %*arcs.right and /ayne +arric&'(

t is E+s nderstanding from that meeting that the o$er-riding concern of the EA and EHDis that as de$elo#ment contines! costs materialise that case *iller Homes %andconseently NPL Estates' to abandon the de$elo#ment #lans with #ro#osed remediationleft nfinished( "he concerns were in two #arts! the first directly relate to a #ercei$ed lac& ofin$estigati$e co$er for3

•

"he former #ower station area4 and• "he former + #lant land on the northern bondary of the #ro#osed de$elo#ment(

"he second isse was raised by the EA! who #ointed ot that a remedial target for anilinehad not been de$elo#ed in the bried drm area and that this cold not arri$ed at ntil thedissol$ed #hase #lme had been flly delineated or at least stdied in sfficient detail(

Additional minor concerns were raised o$er #resentation sch as identifying areas by anagreed! recognisable name and #ro$iding a scaled ma# of the entire area of thede$elo#ment with grondwater tied in across the rele$ant areas( As a conseence! E+was #ro$ided with "hornton Power )tation Plan No( 56611 %Location of Plant Ei#ment'which indicated the location and contents of all #ossible contaminants of concern %+o+s'( A

co#y of this #lan is attached for the EA! EHD and Encia and has been referencedthroghot this docment(

,ased on the meeting! E+ wold obser$e on behalf of its client! *iller Homes! thathistorical e#erience of im#act from single de$elo#ment8single se #ower stations indicatesthat significant dissol$ed #hase im#act is nli&ely and that most contaminants ha$e a lowsolbility! mobility and $olatility! ma&ing them relati$ely low ris& where residentialde$elo#ment is concerned( )imilarly! significant wor&s ha$e been com#leted at the anilinearea and that! allied to etensi$e historical &nowledge! ma&es E+ confident that nosignificant! as yet ndetected contaminant isses are #resent in the aniline area(

E+ ac&nowledges that a lea&ing drainage system cold ha$e generated grondwater

isses along the northern bondary at the former + #lant and that information for this areawas limited(

egistered Address3 Hadfield Hose! Hadfield )treet! *anchester! *19 6:E( +om#any egistration No( ;1;;5;2

0 2?E"ele#hone3 0191-595-1;00:a3 0191-595-1;01E-mail3 sales@recltd(co(&htt#388www(recltd(co(&Resource & Eniron!ent"# $onsu#t"nts Ltd


34/169

*iller Homes 20 December 2007,orne oad! "hornton 2;#82

O%ectie

E+ has re$iewed all a$ailable soil and grondwater data a$ailable for the site andidentified #ossible eisting wells beyond the railway that may #ro$ide downgradientdelineation in the aniline area( "he reslt of that re$iew has been sed to de$elo# thefollowing #ro#osed sco#e of wor&( "he obBecti$e of this #ro#osed wor& is to3

1( Pro$ide sfficient confidence to *iller Homes and NPL Estates that remediationcosts %and conseently land $ale' are not significantly different to those alreadyantici#ated4 and

2( Pro$ide the EA and EHD sfficient information to show that no ne#ected costseist in the three areas of concern %#ower station! aniline area! northern bondary+ area'(

:or the EA and EHD! this information will inclde soil and srface8grondwater isses acrossthe sites! remedial targets for the aniline %if needed' and grond gas information #ertinent tofondation design8#rotection(

Sco'e o( )or*

t is intended that the sco#e of wor& will be com#leted in discrete #hases! which wold allowfor a cost effecti$e and fleible strategy to be im#lemented( "his essentially means thatwhile in some areas! both drilling and trial #itting will be carried ot side by side! there maybe some locations where some acti$ities change as a reslt of soils analysis or well locationschange from those re#resented on the attached #lans(

:or the #r#ose of this otline sco#e of wor&! a##licable names ha$e been assigned to eacharea of concern %A


35/169


"he referenced nmbers refer to nmbered locations and contents for tan&s etc( on PlanNo(56611( A site #lan otlining these areas is inclded as :igre 1(

De to the #otential im#act of contaminants of concern %+o+' on controlled waters and the#ossible #resence of haardos grond gas in the $icinity of the site! additional intrsi$ewor&s followed by grond gas and grondwater monitoring is #ro#osed( "he sco#e for each A


36/169


5. B"##"rd Pro'erties

Diesel im#acted nsatrated and satrated soil were identified in the $icinity of the formerdiesel tan& in this area and with its #roimity to srface waters! E+ ha$e identified the needfor fi$e additional trial #its to delineate the etent of the significant hydrocarbon im#act andthree window sam#le boreholes %com#leted as wells' to confirm $ertical im#act as well asim#act to grondwater( "he three wells are needed to trianglate grondwater flow and todetermine $elocities if necessary( A srface water sam#le will be collected from thendrained area adBacent to this site(

"he soils and waters will be analysed for )#("PH! PAH and inorganics( A limited nmber ofsoils will be tested for F


37/169


9. Tr"ns(or!er Are"

"he bilding in this area was $andalised and finally set alight(


38/169


A site #lan otlining these areas is inclded as :igre 2(

De to the #otential im#act of contaminants of concern %+o+' on controlled waters and the#ossible #resence of haardos grond gas in the $icinity of the site! E+ #ro#ose tocom#lete additional intrsi$e wor&s followed by grond gas and grondwater monitoring is#ro#osed( "he sco#e for each A


39/169


rig ca#able of allowing the installation of >0mm diameter monitoring wells( All the wells willbe screened from abo$e the water table to a##roimately ;(0m below it( t is #ro#osed thattrial #itting will be nderta&en within this sector of the site by the se of a /+, ;+ eca$atorfitted with a hydralic brea&er(

:ollowing installation of wells! all locations will be sr$eyed sch that a single scale #lan canbe #rodced showing all locations accrately and allowing grondwater flow direction to bedetermined across the site(

PROPOSED SITE )OR+ BURIED ANILINE DRUM AREA

A nmber of in$estigations ha$e been com#leted in this area and to the east of it which ha$eidentified $arios hydrocarbon #lmes migrating east towards the .yre estary andassociated saltwater #onds( :ollowing discssions with the EA! it is considered that a downgrondwater gradient ga# eists in the dissol$ed #hase delineation and that a remedialtarget is reired that they can agree to that does not generate a de$elo#ment-#rohibiting

cost(

"he following wor& is therefore reired in the aniline drm area and associateddowngradient areas3

1( "o#ogra#hic sr$ey to tie in all wells on crrent and former NPL #ro#erty from $ariIos in$estigations and determine grondwater flow regime( nclde any trenches! inIclding de#th and dimensions( Prodce a single scale drawing of the bried anilinedrm area! the railway line and the land frther to the east containing all rele$antwells and tie this into the :ormer NPL land(

2( Prodce scaled cross-sections as an initial +once#tal )ite *odel %+)*' showing

sorces! #athways and rece#tors %inclding ecological'( "he figre will inclde these#arate #hase #re$iosly ma##ed! dissol$ed #hase %estimated'! down-gradient srIface-water body rece#tors! on-site ditches and ftre rece#tors when sed as #blico#en s#ace(

"he +)* shold also show #ro#osed monitoring wells %or eisting a##ro#riately#laced wells' designed to com#lete the nderstanding of the hydrogeological regimeand contaminant migration( "he #lan drawing and cross section wold then be sentto the EA for confirmation of #lans(

;( nstall any wells identified as necessary to ca#tre contaminant migration( +ollect allsoil sam#les and analyse for all necessary #arameters(

( ( +om#lete "* model %EA grondwater fate and trans#ort model' calibrated singthe actal grondwater sam#ling data to determine ris& to i$er .yre! any srfacewaters! ecology and determine remedial action target for contaminants(

9(


40/169


7( dentify additional well locations where #ost remediation installations can be sed tomonitor natral attenation of the $arios #lmes(

5( Prodce a re#ort in line with +L11 setting ot the findings of the in$estigation! thereslts of any modelling %grondwater! hman health! ecological rece#tors' and otIline remedial action #lan to be followed once asbestos remediation is com#lete(

"he soil and grondwater testing schedle will address &nown contaminants rather than beall-encom#assing( E+ #ro#oses testing any soils and all grondwaters for )#("PH!)F


41/169


APPENDIX V

REC TRIAL PIT LOGS


42/169

Trial Pit Number:Project Number:

Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:

SUBSURFACE PROFILE SAMPLES AND IN-SITU TESTING

D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting

Resource & Environmental Consultants LtdOsprey HousePacific QuayBroadwayManchester, M50 2UETel: 0161 868 1300 / Fax: 0161 868 1301www.recltd.co.uk

Key B. Bulk (Bag)W. WaterU100. 100mm UndisturbedU38. 38mm Undisturbed SampleSPT. Standard Penetration Test

D. DisturbedG. Amber Glass Jar / BottleCPT. Cone Penetration TestU100. Blows (Recovery mm)V. 40ml Glass Vial

T. Plastic TubN. 'N' ValueHV. Hand Shear VanePID. Photo Ionisation Detector

Notes

Trial Pit Record

Prior to excavation the trial pit location was scanned with a Cable Avoidance Tool (CAT).

TP30143391

Thornton Power Station

Marcus Wright

5/5/10

5/5/10

N/A

N/A

MADE GROUND: 6F2.

MADE GROUND: Coal dirt.

MADE GROUND: Firm to stiff slightly silty greyclay with occasional sand inclusions.

Light brown slightly silty slightly clayey fineSAND.

No odour.

Trial pit completed at 2.50m bgl.

1.00

1.70

2.20

2.50

DG

DG

DG

1.20

1.70

2.30

W a t e r s t r i k e a t 1 . 7 0 m b g l .

25 50 750 100

1.00m x 1.00m x 2.50m

Stable

Water strike at 1.70m bgl.

3/6/10

Prelim 1


43/169


Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP30243391


Marcus Wright

5/5/10

5/5/10

N/A

N/A

MADE GROUND: 6F2.

MADE GROUND: Soft black very silty clay.

Damp.

No odour.

MADE GROUND: Very gravelly fine to coarsesand. Gravel is fine and rounded.

Light grey silty CLAY.


1.30

1.70

2.10

2.50

DG 1.40


25 50 750 100

1.00m x 1.00m x 2.50m

Stable


3/6/10

Prelim 1


44/169


Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP30343391


Marcus Wright

5/5/10

5/5/10

N/A

N/A

MADE GROUND: 6F2.

MADE GROUND: Brown soft to firm gravelly

clay with occasional cobbles. Gravel is angularto sub-rounded of concrete, brick and mixedlithology.

Dark grey/black slightly clayey gravelly SAND.

Light grey slightly silty clayey SAND.


0.60

1.70

2.00

2.10

DG 1.90

W a t e

r s r t i k e a t 1 . 9 0 m b g l .

25 50 750 100

1.00m x 1.00m x 2.00m

Stable


3/6/10

Prelim 1


45/169


Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP30443391


Marcus Wright

5/5/10

5/5/10

N/A

N/A

MADE GROUND: 6F2.

MADE GROUND: Brown soft to firm slightlygravelly clay. Gravel is angular to sub-roundedof mixed lithology.

Black fine gravelly SAND.

Grey/green sandy fine to coarse angular to sub-rounded GRAVEL of mixed lithology.

Light grey slightlky silty slightly clayey fineSAND.


0.40

1.80

2.00

2.30

2.40

W a t e r s t r i k e a

t 2 . 1 0 m b g l .

25 50 750 100

1.00m x 1.00m x 2.40m

Stable


3/6/10

Prelim 1


46/169


Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP30543391


Marcus Wright

5/5/10

5/5/10

N?A

N/A

MADE GROUND: 6F2.

MADE GROUND: Brown clayey gravelly sand.Gravel is fine to coarse and angular to sub-rounded.

Brown gravelly softr to firm CLAY. Gravel issub-angular to sub-rounded of mixed lithology.


0.40

1.70

2.00

DG

DG

0.60

1.80

W

a t e r s t r i k e a t 1 . 8 0 m b g l .

25 50 750 100

1.00m x 1.00m x 2.00m

Stable


3/6/10

Prelim 1


47/169


Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP30643391


Marcus Wright

5/5/10

5/5/10

N/A

N/A

MADE GROUND: 6F2 combined with blackcoal ash/fine gravel.

MADE GROUND: Brown clayey dirt with ash,coal, gravel, brick and concrete.

Firm grey slightly silt CLAY with a fine bluishmottle at the top.


0.70

1.50

2.20

DG

DG

0.60

1.50


25 50 750 100

1.00m x 1.00m x 2.20m

Stable


3/6/10

Prelim 1


48/169


Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP30743391


Marcus Wright

5/5/10

5/5/10

N/A

N/A

MADE GROUND: 6F2.

MADE GROUND: Red/brown Type 1 from oldroad...Variable.

Grey firm gravelly CLAY. Gravel is coarse andsub-angular to angular.


1.00

1.40

1.60 DG 1.60


25 50 750 100

1.00m x 1.00m x 1.60m

Stable


3/6/10

Prelim 1


49/169


Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP30843391


Marcus Wright

7/5/10

7/5/10

N/A

N/A

MADE GROUND: 6F2.

MADE GROUND: Black coal ash.

MADE GROUND: Brown clayey gravelly soilwith cobbles. Gravel is fine to coarse of mixedlithology. Cobbles are of brick.

At 2.20m bgl...Pipe with possible oilencountered.


0.40

1.30

2.30

DG

DG

DG

DG

M o i s t u r e e n c o u n t e r e d a t 1 . 9 0 m b g l .

25 50 750 100

1.00m x 1.00m x 2.30m

Stable

Moist at 1.90m bgl.

3/6/10

Prelim 1


50/169


Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP30943391


Marcus Wright

7/5/10

7/5/10

N/A

N/A

MADE GROUND: 6F2.

MADE GROUND: Black ash and coal.

MADE GROUND: Sand and clay matrix inground of brick, concrete and stone.

MADE GROUND: Concrete pad with brick...Dryon top.

Firm grey silty CLAY.

Brown firm slightly silty CLAY.


0.30

0.90

1.30

1.50

1.70

2.20

25 50 750 100

1.00m x 1.00m x 2.30m

Stable

None encountered.

3/6/10

Prelim 1


51/169


Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP31043391


Marcus Wright

7/5/10

7/5/10

N/A

N/A

MADE GROUND: 6F2.

MADE GROUND: Red/brown sand matrix withbrick, concrete and stone.

MADE GROUND: Brown clayey gravel.

Grey silty CLAY.

At 0.80m bgl...Water pipe encountered.

Between 1.70m bgl-1.90m bgl...Staining.


0.30

1.20

1.90

2.40

DG

DG

0.60

1.90

25 50 750 100

1.00m x 1.00m x 2.40m

Stable

None encountered.

3/6/10

Prelim 1


52/169


Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP31143391


Marcus Wright

7/5/10

7/5/10

N/A

N/A

MADE GROUND: Brown sandy gravel withpockets of clayey matrix. Gravel is fine tocoarse angular to sub-angular of brick, concreteand mixed lithology.

MADE GROUND: Grey stained at the top/lightbrown firm slightly silty slightly gravelly clay.

Red/brown firm to stiff CLAY.


1.00

1.30

1.80

DG 0.80

25 50 750 100

1.00m x 1.00m x 1.80m

Stable

None encountered.

3/6/10

Prelim 1


53/169


Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

4.0

5.0

6.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP31243391


Marcus Wright

7/5/10

7/5/10

N/A

N/A

25 50 750 100

1.00m x 1.00m x 1.30m

Stable


54/169


Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP31343391

Thornton Power Stations

Marcus Wright

7/5/10

7/5/10

N/A

N/A

MADE GROUND: 6F2.

MADE GROUND: Firm grey mottled brownslightly silty clay with traces of organics.

Firm brown slightly silty CLAY.


0.90

1.60

2.00

DG 0.90

25 50 750 100

1.00m x 1.00m x 2.00m

Stable

15/6/10

Prelim 1


55/169


Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP31443391


Marcus Wright

7/5/10

7/5/10

N/A

N/A

MADE GROUND: 6F5.

MADE GROUND.

MADE GROUND: Concrete pad.

Firm grey silty CLAY.


0.60

0.80

1.00

1.10

25 50 750 100

1.00m x 1.00m x 1.00m

Stable

None encountered.

15/6/10

Prelim 1


56/169


Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP31543391


Marcus Wright

26/5/10

26/5/10

N/A

N/A

MADE GROUND: 6F2.

MADE GROUND: ???

MADE GROUND: Red brick.

MADE GROUND: Grey slightly silty clay withsome organic material in upper layer.

Pipe at 1.20m bgl.

Soft brown peaty CLAY with gravel to top of

strata.

Light grey soft to firm silty CLAY.


0.30

0.50

1.00

1.60

1.80

2.10

DG 1.60

W a t e r s t r i k e a t 1 . 2

0 m b g l .

25 50 750 100

1.00m x 1.00m x 2.10m

Stable


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Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP31643391


Marcus Wright

26/5/10

26/5/10

N/A

N/A

MADE GROUND: 6F2.

MADE GROUND: Dark brown sandy gravel.

Firm grey sandy CLAY.

Brown peaty gravelly CLAY. Gravel is fineangular to sub-angular of mixed lithology.

0.40

1.50

1.70

1.90

DG

DG

1.50

1.60 M o i s t a t 1 . 7 0 m b g l .

25 50 750 100

1.00m x 1.00m x 1.90m

Stable

Moist at 1.70m bgl.

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Prelim 1


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Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP31743391

Thorton Power Station

Marcus Wright

26/5/10

26/5/10

N/A

N/A

MADE GROUND: 6F2-Brick, concrete, stone.

MADE GROUND: Sandy ??? and large cobblesof concrete.

MADE GROUND: Soft to firm dark grey gravellyclay and organic materials...Occasionalstaining...Dry.

Firm grey CLAY.


0.30

1.00

1.20

1.50

DG 1.00

25 50 750 100

1.00m x 1.00m x 1.150m

Stable

None encountered

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Prelim 1


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Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP31843391


Marcus Wright

26/5/10

26/5/10

N/A

N/A

MADE GROUND: 6F2.

MADE GROUND: Brick, concrete, stone sandclay matrix.

MADE GROUND: SOft to firm re-worked claywith occasional brick and concrete.


0.70

1.30

2.10

DG

DG

1.30

1.60

P o c k e t o f w a t e r e n c o u n t e r e d a t 1 . 4 0 m b g l .

25 50 750 100

1.00m x 1.00m x 2.10m

Stable

Pocket of water encountered at 1.40m bgl.

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Prelim 1


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Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n d

DescriptionDepth of

Strata(mbgl)

TypeDepth(mbgl)

WaterLevel(mbgl)

P.I.D(ppm) Field /

LaboratoryTesting





Notes

Trial Pit Record


TP32043391


Marcus Wright

26/5/10

26/5/10

N/A

N/A

MADE GROUND: 6F2.

MADE GROUND: Soft to firm grey mottled silty

clay with traces of organic matter to top ofstrata.

Between 0.70m bgl-1.00m bgl...Staining.


0.60

1.80

DG

DG

0.70

1.70

25 50 750 100

1.00m x 1.0m x 1.80m

Stable

None encountered.

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Prelim 1


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Contract Name:

Client:

Engineer:

Date Started:

Date Completed:

Elevation AOD (m):

Co-ordinates:

Excavation Method:

Dimensions:

Services:

Stability:

Groundwater:

Date:

Status:


D e p t h

( m b g l )

1.0

2.0

3.0

L e g e n �

application documentation 2

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