Remediation Method Statement TCE Monitoring Area, AWE ... · The remediation method statement has been developed to outline contractor requirements to manage or mitigate contamination

Remediation Method Statement

TCE Monitoring Area, AWE Burghfield, Berkshire

AWE plc

Prepared by: Authorised by: Simon Johnson Robert Jones Park House Greyfriars Road Cardiff CF10 3AF Tel 02920 668 662 JER3996/TCE/RMS Fax 02920 668 622 Revision: 2 Email [email protected] May 2009

Planning & Development

This report has been produced by RPS within the terms of the contract with the client and taking account of the resources devoted to it by agreement with the client.

We disclaim any responsibility to the client and others in respect of any matters outside the scope of the above.

This report is confidential to the client and we accept no responsibility of whatsoever nature to third parties to whom this report, or any part thereof, is made known. Any such party relies on the report at their own risk

RPS Planning and Development Ltd. Registered in England No. 02947164 Centurion Court, 85 Milton Park, Abingdon, Oxfordshire, OX14 4RY A Member of the RPS Group Plc


Contents

Contents ............................................................................................................. i

1 Introduction ................................................................................................ 1

1.1 Introduction................................................................................................. 1

1.2 Scope of the TCE Area Method Statement............................................... 1

1.3 Remediation Objectives ............................................................................. 2

1.4 Structure of Report..................................................................................... 3

2 Overview of Environmental Risk Setting ................................................. 4

2.1 Introduction................................................................................................. 4

2.2 Site Location and Description ................................................................... 4

2.3 Evidence of Contamination during Previous Site Investigations .......... 5

3 Summary Risk Assessment ...................................................................... 7

3.1 Introduction................................................................................................. 7

3.2 TCE Contaminated Area............................................................................. 7

4 Remedial Options Appraisal ..................................................................... 9

4.1 Introduction................................................................................................. 9

4.2 Previously Unidentified Contamination.................................................... 9

4.3 Groundwater Assurance Monitoring ...................................................... 10

4.4 Recent Remedial Works by SRG and Verification of Baseline

Conditions............................................................................................................ 10

5 Remediation Implementation Plan.......................................................... 12

5.1 Introduction............................................................................................... 12

5.2 Proposed Formation Level Inspections ................................................. 12

5.3 General Procedures During Excavations in Potentially Contaminated

Soils… .................................................................................................................. 13

5.4 Procedures for Encountering Unidentified Contamination .................. 14

5.5 Asbestos Control and Disposal Measures............................................. 16

RPS Planning & Development i AWE (B) TCE Monitoring Area May 2009 JER3996/TCE/RMS


RPS Planning & Development ii AWE (B) TCE Monitoring Area May 2009 JER3996/TCE/RMS

5.6 General Waste Handling Arrangements ................................................. 17

5.7 Explosives and UXO Safety Management System ................................ 18

5.8 Groundwater Assurance Monitoring Programme ................................. 19

5.9 Validation of Phase 1A Remdiation works by Awe SRG....................... 20

6 Remediation Verification Plan ................................................................ 21

6.1 Routine Documentation ........................................................................... 21

6.2 Remediation Verification Report ............................................................. 22

6.3 Off Site Disposal of Waste ....................................................................... 24

7 References................................................................................................ 27


Drawings

JER3996-003 Mensa Development Proposals

243405_AE_PG_GA001 Pingewood Gate General Arrangement

JER3996-004 Groundwater Source Protection Zones & AWE Water

Monitoring Locations

JER3996-TCE-001b Sampling Locations

JER3996-TCE-003 Remediation Plan - TCE Monitoring Area

RPS Planning & Development i AWE (B) TCE Monitoring Area May 2009 JER3996/TCE/RMS


RPS Planning & Development ii AWE (B) TCE Monitoring Area May 2009 JER3996/TCE/RMS

Appendices

Appendix A Summary of Mensa Site Specific Target Levels


1 Introduction

1.1 Introduction

RPS Planning and Development (RPS) have been commissioned by AWE plc

to produce a Remediation Method Statement (RMS) for the TCE impacted area

(for the purposes of this Report referred to as the ‘TCE Area’) which forms part

of the proposed overall Project Mensa Facility Development at AWE Burghfield

(AWE (B)). An overarching Remediation Method Statement (RMS) for the

Project Mensa Facility Development (Ref. 19) and a Remediation Specification

(Ref. 21) for the Pingewood Gate Development, have already been published

by RPS for the wider Mensa Application Site area.

Project Mensa is part of the Site Development Strategy Plan (SDSP) for AWE

Aldermaston and AWE Burghfield, involving refurbishment and replacement of

facilities constructed in the 1950s and 1960s. The Mensa Facility development

project will be undertaken at AWE (B) and will extend beyond 2015. It involves

the consolidation of operational uses and subsequent clearance and

redevelopment of the site.

This report details the requirements for remediation and mitigation of land

contamination risks to protect the development identified in the Mensa Ground

Conditions Technical Report (GCTR) (Ref. 12) and from supplementary

investigations, monitoring, risk assessments and reporting which have been

undertaken since issue of the GCTR specific to the TCE impacted area. The

report has been prepared in line with guidance provided in CLR-11 (Ref. 2).

The TCE Area is shown on Drawing JER3996-TCE-003 Rev3 and the

proposed main development plan is provided as Drawings JER3996-003 and

243405_AE_PG_GA001.

1.2 Scope of the TCE Area Method Statement

Numerous site investigations and land quality reports have been undertaken

across the TCE Area to identify ground contamination. Following assessment

and characterisation, a number of risks from shallow soils and groundwater

RPS Planning & Development 1 AWE (B) TCE Monitoring Area May 2009 JER3996/TCE/RMS


contamination have been identified, which could pose unacceptable risks to

human health and controlled waters if not managed appropriately.

A summary of the identified risks and recommendations to mitigate these within

TCE Area are outlined in the GCTR (Ref. 12) and in the TCE Area

Interpretative Report (Ref 14). Reference should be made to these reports for

more detail, but pertinent risks can be summarised as:

The potential for a source of Trichloroethene (TCE) contamination in

shallow soils associated with the former 10A buildings.

Potential for previously unidentified exploded ordnance causing a risk

to construction workers and future site users.

TCE contamination in groundwater causing potential risk to controlled

waters.

1.3 Remediation Objectives

The remediation method statement has been developed to outline contractor

requirements to manage or mitigate contamination risks during the

development of the TCE Area, including

Providing appropriate methodologies on the identification, delineation,

assessment and remediation of known or previously unidentified

contamination, encountered during construction

Outlining procedures to protect construction workers, AWE staff and

site visitors and the general public from contaminants during

construction;

Providing requirements for remediation verification to demonstrate that

remedial targets and objectives have been met (Remediation

Verification Plan); and,

Identifying requirements for remediation supervision or independent

inspection of contamination or remediation by the AWE Appointed

Environmental Consultant during the construction works;

Requirements for appropriate characterisation and sentencing of

contaminated soils for off site disposal or retention on site, as required;



Protocols for material handling, stockpiling and waste management

procedures for off site disposal;

Defining monitoring wells which need to be protected during the overall

Mensa development project including temporary works such as the

construction of the Pingewood Gate car park area, in order to maintain

the ongoing site wide groundwater assurance monitoring programme,

including specific monitoring requirements for the TCE Area;

Outlining requirements for record keeping and specific documentation

necessary for validating all the above to allow the independent

production of a Verification Report.

Furthermore, it should be noted that for the large majority of the Mensa

development area, there is no actual necessity for soil or groundwater

remediation to be undertaken prior to development. However, the purpose of

this document is also to outline the necessary procedures, should unexpected

contamination be encountered.

1.4 Structure of Report

The remainder of this document is divided into the following sections:

Section 2: Overview of Environmental Risk Setting;

Section 3: Summary Risk Assessment;

Section 4: Remediation Options Appraisal;

Section 5: Remediation Implementation Plan

Section 6: Remediation Verification Plan, and,

Section 7: References.



2 Overview of Environmental Risk Setting

2.1 Introduction

This section of the report summarises the environmental risk setting of the area

around the TCE Area, which includes a description of the site and its

surrounds, the regional geology, hydrogeology and hydrology. A detailed

environmental risk setting assessment is given within the GCTR.

2.2 Site Location and Description

2.2.1 General Description of AWE Burghfield

AWE Burghfield is located approximately 0.5 km east of the Burghfield village

and 6km to the south west of Reading. The National Grid Reference for the site

centre is SU 680 680. AWE Burghfield is approximately 264 acres and is

roughly rectangular in shape. The topography is relatively flat with general

slope from south (46.5 mAOD) to north (42.5 mAOD).

Part of AWE Burghfield is an operational nuclear licensed site and is operated

by AWE plc. It comprises areas containing occupied and unoccupied buildings

and structures used for a variety if industrial process.

Concrete roadways and paths allow access to the various buildings and

structures. AWE Burghfield also comprises landscaped areas mainly with grass

cover with trees interspersed.

Access is from the north-west, via the road called ‘The Mearings’. AWE

Burghfield is surrounded by a high security fence and is subject to strict

security controls. The eastern, southern and western edges of AWE Burghfield

are bounded by roads. AWE Burghfield is mainly surrounded by open fields

and occasional woodland areas.

A small stream known as Burghfield Brook is along the southern and eastern

edges of AWE Burghfield and un-named stream is to the north of AWE

Burghfield flowing eastwards.



2.2.2 TCE Area The TCE Area comprises the land around buildings 10A9, 10A12, 10A13A,

10A17, 10A18 and 10A30 or their former locations and is shown on Drawing

JER3996-001b.

Part of the TCE Area comprises the Phase 1 Demolition Area, located to the

south-west of Pingewood Gate, which has undergone building demolition. Part

of the TCE Area also includes the proposed location of the Pingewood Gate

temporary car park forming part of the Mensa Application Site (see Drawing

JER3996-001b). The western part of the TCE Area lies outside the Mensa

Application Area and with the exception of protecting and sampling from

existing groundwater monitoring wells, no remedial action is considered as part

of this report.

The TCE area is not within the nuclear licensed area of the facility.

2.2.3 Environmental Setting For more information of the site and its surrounds, the regional geology,

hydrogeology and hydrology etc. and background information on ground

conditions from previous ground investigations, reference should be made to

the Factual and Interpretive Ground Investigation Reports for TCE Area (Refs

13 and 14).

2.3 Evidence of Contamination during Previous Site

Investigations

A series of ground investigations have been undertaken across the Mensa

Application Site and the scope of works are summarised in Table 2.1 below.

Table 2.1 Summary of Previous Investigations

Area Report Ref.

Scope of Works Key Findings

10A TCE Investigation Area

Ref. 6, 7 and 8

Initial Characterisation Survey (Land Quality Assessments). Factual and Interpretative Reports. (March 2005) Intrusive Ground Investigation included:

• Boreholes • Radiological monitoring • Trial pits

Elevated levels of chemical contaminants were identified in shallow groundwater, principally chlorinated solvents, most likely degraded constituents from an original TCE contaminant. A definitive source of these contaminants has yet to be identified. Additional assessments were recommended to identify both surface water and groundwater management




Area Report Ref.

Scope of Works Key Findings

Factual Report Interpretive Report

Ref. 9

Ref. 10

• Explosive ordnance survey • Drain sediment sampling • Gas and groundwater

monitoring • Samples of soil and

groundwater • Analysis for metals, TPH,

explosives, VOCs, SVOCs, PAH etc, asbestos, gross alpha & gross beta and gamma spectrometry and radiochemistry

10A Area TCE Monitoring Factual Report (January 2008) included:

• 3 rounds of gas and groundwater monitoring at 12 previously installed boreholes

• Samples of soil and groundwater

• Analysis for metals, TPH, explosives, VOCs, SVOCs, PAH etc, asbestos, gross alpha & gross beta and gamma spectrometry and radiochemistry

10A Area TCE Monitoring Interpretative Report (February 2008)

requirements.

Additional 10A Buildings / TCE investigation

Refs.

13 & 14

Intrusive investigation of an area found to be contaminated by TCE in previous investigations. The investigation aimed to provide further information on the extent of the TCE contamination and potentially facilitate the identification of the source (November 2008/ January 2009) The investigation included:

• 10 window sample locations fitted with gas and groundwater taps

• Radiological monitoring • sampling of soil during drilling • 3 rounds of gas and

groundwater monitoring, and groundwater sampling at the 10 new boreholes and 7 existing locations

• 3 rounds of water sampling, and 1 of sediment sampling, from 12 drains, an outfall and Burghfield Brook

• Analysis of soil, sediment and groundwater samples for chemical (particularly VOCs), radiological and explosives.

Low / negligible levels of risk associated with soil and groundwater contaminants. Recommended continued groundwater monitoring for VOCs at 3No. TCE impacted boreholes (PH173, PH176 and WS-TCE-04) and 4No. un-impacted site boundary shallow boreholes (WS-TCE-05, WS-TCE-06, WS-TCE-08 and WS-TCE-09) and a single deep borehole (BH104) to monitor groundwater quality within the Reading Beds and associated risks to the AWE groundwater abstraction. Review of monitoring data to be undertaken following completion of the redevelopment works to determine any unacceptable residual risks to groundwater quality. Continued regular testing for VOCs within the output from the granular activated carbon (GAC) filter discharging at Outfall 1. A SSTL for TCE has been proposed for testing soils following the detection of gross visual or olfactory evidence of VOC contamination of soils during redevelopment works.


3 Summary Risk Assessment

3.1 Introduction

Following the completion of all site investigation works for the TCE Area, soil

and groundwater samples have been tested for a broad suite of radiological,

chemical and explosive contaminants. In addition, gas and groundwater

monitoring was undertaken.

The results of the all above investigations and subsequent risk assessments for

the TCE Area are presented in the GCTR and subsequent supplementary

Factual and Interpretative Reports (Refs: 13 & 14). Potential pollutant linkages

(PPL) were identified within the Refined Conceptual Model developed within

the Interpretative Report, and are summarised in terms of the source, pathway,

receptor in the following sections.

The contaminants identified, pollutant linkages, associated risk and remedial

measures required are outlined in Table 3.1 below:

Table 3.1 Summary Table of Risks Requiring Remediation

Area Affected Contaminants of Concern

Pollutant linkages Risk Remedial Action Required

10A Buildings/ TCE Area

Groundwater contamination

Soil or groundwater contamination

impacting shallow groundwater &

Burghfield Brook

Low *Groundwater assurance

monitoring / monitored natural

attenuation

* Options Appraisal Required

3.2 TCE Contaminated Area

The potential pollutant linkages present for contaminants at the TCE Area are

outlined in Table 3.2.



Table 3.2 Building 10A / TCE Area Contamination PPLs

Source Pathway Receptors Risk

Trichloroethene (TCE) contamination within shallow

soils

Leaching by water infiltration

Shallow groundwater Low

TCE contaminants within the shallow groundwater

Shallow groundwater migration

Unnamed streams Low

TCE contaminants within the shallow groundwater

Vertical migration Deep aquifer Low

TCE contaminants in groundwater

Lateral and vertical migration

Abstraction borehole Low

TCE contamination has been identified within the groundwater beneath the site

and these are discussed in detail within the TCE Contaminated Area

Interpretative Report (Ref. 14).

The identified elevated levels of chemical contaminants within groundwater

beneath the TCE Area are considered to have low potential to impact on

surrounding groundwater receptors.



4 Remedial Options Appraisal

4.1 Introduction

In order to minimise the potential risks identified within Section 3 for the TCE

Area, an ‘Options Appraisal’ has been undertaken in line with CLR 11 (Ref. 2)

to assess the best practicable remediation options to meet the remedial

objectives set out in Section 1.4.

For each identified potential pollutant linkage, remedial options are presented

in the following sections.

4.2 Previously Unidentified Contamination

A discrete source of TCE contaminated soil has not been identified despite a

significant number of samples being collected and analysed. Risk assessment

(provided in Report Reference: Ground Investigation Interpretative Report, TCE

Contaminated Area, AWE Burghfield, Berkshire, JER2588/TCE/LQA/I, January

2009) has identified that the risk to controlled waters from TCE or other

contaminants based on the proposed development is unlikely and therefore

specific remediation is not required.

However, given the elevated TCE concentrations in surface drain waters and

groundwater in some locations, there is a greater potential for shallow soils to

be present which have been impacted by trichloroethene [or other volatile

organic compounds or chlorinated solvents]. Consequently the AWE appointed

Environmental Consultant should be present during the groundworks phase to

inspect the exposed formation level and also should any suspected

contamination be identified during construction. In addition to a visual and

olfactory inspection, a PID should be used to monitor potentially impacted soils.

Where significantly elevated concentrations of volatile vapours are recorded,

and materials are identified as potentially contaminated, works must be

immediately stopped and samples collected for field and / or laboratory

analysis as deemed appropriate by the AWE Appointed Environmental

Consultant.



4.3 Groundwater Assurance Monitoring

Monitoring should be undertaken on a monthly basis during the construction /

remediation works phase, and at quarterly intervals post remediation /

construction phase. This will assist in identifying any significant changes in

water quality, immediately before, during and after construction, for assurance

purposes. Contaminants to be monitored in groundwater in the TCE Area will

include various relevant previously identified contaminants, and in particular

trichloroethene. A number of groundwater quality indicators and physical

parameters will also be measured.

A number of pre-existing monitoring wells are located across the Pingewood

Gate development area at key locations. Those relevant to the TCE Area

include wells within boreholes BH104, PH173, PH176, WS-TCE-04, WSTCE-

05, WSTCE-06, WSTCE-08 and WSTCE-09. Each of these wells are required

to be serviceable throughout the construction phase, to ensure continuity with

the ongoing assurance monitoring of groundwater quality. Monitoring will also

be undertaken of groundwater from Burghfield Brook at SW3, and also from

Outfall 1.

Groundwater will be sampled by the AWE Appointed Environmental Consultant

at specified regular intervals, prior to construction, during site development

work and post construction. Therefore all existing monitoring boreholes listed

above and indicated on Drawing JER3996-TCE-003 must be protected and

maintained by the Contractor to ensure their viability for the duration of the

programme of assurance groundwater monitoring.

However, there is a possibility that a number of boreholes may be damaged or

destroyed during the main construction works hence any monitoring boreholes

which are rendered unserviceable as a result of construction will require

replacement to ensure continued site coverage for the assurance monitoring

and to maintain the dataset.

4.4 Recent Remedial Works by SRG and Verification of Baseline

Conditions

Buildings located within the Phase 1A Demolition Area were recently

demolished. The Phase 1A Demolition Area remedial works were carried out in



line with the Phase 1A Demolition Area Land Remediation Specification (Ref.1)

which included the removal of four identified hotspots of shallow soil

contamination (including asbestos and elevated metal concentrations).

The Remediation Validation Report for the Phase 1A Demolition Area should

be reviewed against the requirements of the Land Remediation Specification

for the remediation elements undertaken in the TCE Area. Should any of the

remedial requirements not have been implemented then further remediation

may be required.



5 Remediation Implementation Plan

5.1 Introduction

A Remediation Implementation Plan (RIP) has been designed using the options

selected in Section 4. The RIP described in this section covers the following

aspects:

Inspection of proposed formation level by Environmental Consultant;

General procedures during excavations;

Groundwater Assurance Monitoring Programme;

Remedial Validation of SRG remediation in Phase 1A Demolition Area;

Procedures for encountering previously unidentified contamination;

Asbestos control and disposal procedures;

General waste handling requirements;

Explosives and UXO safety management system;

Future service maintenance.

It is considered that the implementation of the above remedial procedures will

enable the remedial objectives set out in Section 1.4 to be met.

5.2 Proposed Formation Level Inspections

In order to ensure that the no significant previously unidentified sources of

gross soil contamination by TCE or other contaminants is present that could

pose a potential risk to the human health or controlled waters, the proposed

formation level shall be inspected by an AWE appointed Environmental

Consultant. The Environmental Consultant will visual inspect the exposed

formation level and undertake verification field analysis using a Photo-

ionisation Detector (PID) to check for volatile contaminants. Particular attention

will be paid to the routes of former surface water drainage runs. If suspected

contamination is identified appropriate soil samples will be collected and sent

for laboratory analysis to determine whether further remedial action is likely



(see Section 5.4). The area requiring inspection is shown on Drawing

JER3996-TCE-003.

5.3 General Procedures During Excavations in Potentially

Contaminated Soils

The Contractor shall take account of the following health and safety measures

detailed in the following section to minimise potential risks to construction

workers, AWE staff and the general public, together with nuisance issues,

during the construction / remedial works. A Safe System of Work (SSoW) shall

be designed and implemented by the Contractor and must incorporate:

Works will be monitored by the AWE PM, as required;

Should stockpiling of material be necessary, they will be designated via

markers to categorise them showing whether they are clean or dirty;

Materials placed on stockpiles must be stored such that cross-

contamination from dust dispersal, run-off from rainfall and

contamination of underlying clean soils is prevented;

Any stockpiles will be recorded and inspected by a supervising AWE

appointed Environmental Consultant, who will maintain a schedule of

stockpiles;

Where materials are disposed of off-site to a licensed waste

management facility, under the Duty of Care Regulations, an AWE

appointed Environmental Consultant shall keep a schedule of chain of

custody and consignment notes, which will include waste transfer ticket

number (including waste classification), vehicle registration, destination

landfill and weight recorded by the weighbridge at the landfill; and

Following completion of the works a copy of the disposal record shall

be provided to the AWE PM as part of the Remediation Verification

Report (Section 6).

The following procedures shall be adopted to protect site personnel, which will

be supplemented by PPE/RPE and additional SSoWs as necessary.

Provision of covers over any skips of waste to reduce dust and contact

with the waste;



Minimising dust from groundworks by use of damping down equipment

as required;

Wheel wash/lorry wash for use by all vehicles leaving the development

area during the groundworks phase;

Provision of welfare facilities to allow washing prior to use of mess

facilities and leaving site for the day. Facilities also to allow for

changing out of PPE.

The following Personnel Protective Equipment (PPE) is to be used, which will

be maintained and worn:

Hard hats, boots, gloves and high visibility vests;

Disposable overalls to be used as necessary;

P3 filter masks with particulate filters to be made available to staff, and

worn as required.

Although considered unlikely given the nature of the works, additional PPE may

also be required during the course of siteworks and therefore should be made

available where considered necessary (for example, ear defenders, protective

eyewear, vapour masks or Respiratory Protective Equipment (RPE))

The SSoW will also include an Explosive and Ordnance Safety Management

system as described in Section 5.7.

5.4 Procedures for Encountering Unidentified Contamination

As a minimum, the following will need to be established by the Contractor prior

to construction works commencing:

1. Development of a procedure that will be followed if previously unidentified

asbestos, chemical contamination or suspected explosives residues are

identified during earthworks; and

2. Ensuring ground workers have completed a health and safety risk

assessment, developed a SSoW and have demonstrated that adequate

control measures are put in place to manage the potential for soil

contamination.



The following will need to be adhered to in relation to encountering previously

unidentified chemical contamination and asbestos during construction works.

1. Ensure personnel involved in the earthworks are briefed on the likely nature

and type of soils that could indicate the presence of contamination (e.g.

discolouration, oils, odours, asbestos, ash and clinker materials);

2. If such material is encountered, the AWE appointed Environmental

Consultant should be immediately contacted to inspect the material;

3. If material is identified as potentially contaminated, the extent should be

delineated and samples collected for field and / or laboratory analysis as

deemed appropriate by the Environmental Consultant;

4. Analytical results should be compared to Site Specific Target Levels

(SSTLs) generated within the Interpretative Reports (provided in Appendix

A). Once the contamination has been sufficiently delineated, comparison

with the relevant SSTLs applicable to either an indoor or outdoor scenario,

shall be used in conjunction with the development layout plan. Should

significant or unusual contamination be identified advice should be sought

from the AWE appointed Environmental Consultant since new SSTLs may

need to be derived if not already generated for specific chemical

determinants; and

5. Concentrations above the applicable SSTLs will require either further

detailed risk assessment or remediation as advised by AWE appointed

Environmental Consultant. Any further risk assessment or remedial action

shall be agreed with the Local Planning Authority. Based on available

information, it is anticipated that should remediation be the most applicable

course of action, source removal of localised “hot spots” is likely to be the

most appropriate strategy, supported by verification testing. The

remediation verification of any contamination sources identified during

redevelopment will include:

Delineation of the extent of contamination and verification by inspection

and laboratory analysis of soils appropriate to the type of contamination

being removed.

Sentencing and disposal of contaminated materials off-site to a suitably

licensed waste management facility;



Analysis of suspected asbestos containing materials encountered

during redevelopment for an asbestos screen analysis; and

Disposal of encountered asbestos contaminated materials off-site to a

suitably licensed landfill with appropriate chain of custody and

consignment notes required under the Environmental Protection Act,

Duty of Care Regulations. Contaminated waste soils shall be managed

as per Section 5.5.

5.5 Asbestos Control and Disposal Measures

There is low potential for asbestos to be encountered and disturbed during

general earthworks on site and therefore although unlikely, the Contractor must

ensure that he adopts a SSoW should suspected asbestos contaminated soils

be identified. A SSoW will be designed and adopted by the appointed

Contractor and will include the production of all risk assessments and method

statements. Measures to be implemented during earthworks will include:

Use of appropriate RPE/PPE for site personnel;

Covering and containment of stockpiled asbestos contaminated soils;

Segregation and/or hand picking of asbestos contaminated soils where

deemed necessary and practicable; and

Inspection by an Environmental Consultant to confirm no residual

asbestos containing materials remain.

If a substantial amount of previously unidentified asbestos containing materials

are encountered during excavations, additional measures will include:

Development of a Safe System of Work;

Establishment of a decontamination unit;

Damping down of excavations and earthworks;

Wheel wash/lorry wash for use by all vehicles leaving the development

area during the groundworks phase.

Any encountered asbestos contaminated soils (or other ACMs) will require

handling by a licensed contractor and materials disposal off site must be sent

to a licensed management facility.



Inspection by the AWE appointed Environmental Consultant, experienced in

the identification of asbestos, should be undertaken to verify the asbestos

contaminated soils have been removed. The general procedure outlined in

Section 5.6 will be implemented should asbestos be encountered.

The remedial goals for dealing with asbestos contaminated soils will be:

• No visual evidence or laboratory identified asbestos contamination

within 0.3m of final formation level within areas of soft landscaping;

• No visual evidence or laboratory identified asbestos contamination at

the final soil formation level within areas of hardstanding building

footprints.

5.6 General Waste Handling Arrangements

With regard to the general soil waste handling requirements the Remediation

Contractor shall adhere to the following general requirements while handling

waste soils:

• Waste shall be stored and disposed of in accordance with AWE’s

existing Corporate Safety Instructions (CSI1603, CSI1604 and

CSI1701);

• A Site Waste Management Plan should be prepared by the Contractor

for AWE’s approval and then implemented

• All waste shall be segregated, clearly labelled and placed in appropriate

containers or stockpile areas;

• Inert, Non hazardous and Hazardous wastes shall be segregated and

not mixed;

• Waste containers shall be located in a secure, controlled location;

• All Contractors staff / personnel working within the enclave will be

briefed on the waste management requirements and waste

minimisation measures. Records will be kept of attendance;



• Waste audits shall be completed periodically by the construction

Contractor and AWE, the latter shall, as a minimum, be represented by

the Assurance Environmental Department (AED) and the AWE PM;

• If the Contractor requires any waste to be disposed of to a waste

disposal facility, the Contractor shall inform the AWE PM in good time to

allow an audit of the identified potential disposal facility;

• No waste will be brought onto the AWE site from off-site sources; and

• The Contractor shall be responsible for determining whether wastes are

hazardous in line with WM2 (Ref. 15) and shall comply with both

Hazardous Waste Regulations and Landfill Waste Regulations for

disposal of waste to landfill.

5.7 Explosives and UXO Safety Management System

An Explosives and UXO Management System will be implemented during any

future earthworks across the site. Although overall risk of encountering

explosive residues and/or unexploded ordnance (UXO) is considered low

across the TCE area, given the history of development of the site, AWE will

have a UXO Safety Management System in place prior to works commencing.

This will include a number of procedures to be followed should suspect

materials be encountered.

This UXO safety management system will likely include:

• Ordnance and explosive safety briefing to construction staff by an

experienced Explosive Ordnance Engineer including the likely types of

explosives and ordnance that could be encountered during the site

construction works.

• Procedures to follow should suspected explosive residues be identified.

• Procedures to follow should buried unexploded ordnance be identified.

Should UXO or suspected UXO or explosive materials be encountered during

the construction phase, works must be immediately stopped and the AWE PM

immediately informed and a qualified Explosive Ordnance Disposal (EOD)



Engineer will be contacted to undertake an inspection of the residue /

ordnance.

5.8 Groundwater Assurance Monitoring Programme

Existing boreholes in the TCE Area will be sampled at prescribed intervals and

analysis undertaken on groundwaters from Boreholes BH104, PH173, PH176,

WS-TCE-04, WS-TCE-05, WS-TCE-06, WS-TCE-08 and WS-TCE-09.

Burghfield Brook shall be sampled from SW3 and Outfall 1 shall also be

sampled during the assurance monitoring. This is to be undertaken prior to

construction/site development work and at monthly intervals during

construction/site development works and quarterly for a further 6 months post

completion. The proposed wells to be sampled will allow continued monitoring

of the water quality of the shallow groundwater and the deeper aquifer.

In addition to the monitoring programme outlined above, additional sampling

and analysis will be undertaken in boreholes where anomalous results are

obtained in order to determine whether the result can be designated an isolated

occurrence, potentially erroneous or a cause for concern. Those additional

boreholes to be monitored and the chemical testing to be undertaken are

detailed within Table 5.1.

Table 5.1 Groundwater Monitoring Boreholes and Analytical Suites

Borehole or surface water monitoring location

Determinands

Pre, during and post construction

TCE Monitoring Area

BH104, PH173, PH176, WS-TCE-04, WS-TCE-05, WS-TCE-06, WS-TCE-08, WS-TCE-09

SW3 and Outfall 1

Suites for additional GW monitoring to be based on EQS & DWS exceedances to date, based on toxicity and for Volatile Organic Compounds analysis to include trichloroethene

Additional Volatile Organic Compounds analysis to include trichloroethene

In-situ field testing for water quality indicators will also be required during

purging and prior to sampling. The testing shall include dissolved oxygen,

electrical conductivity, redox potential, temperature and pH.

The existing monitoring boreholes should be protected and maintained to

ensure viability for the duration of the programme of assurance groundwater



monitoring. To maintain sufficient coverage of the assurance monitoring, any

monitoring boreholes which are damaged, destroyed or otherwise rendered

unserviceable as a result of construction, will require replacement to ensure a

robust groundwater monitoring network and maintain continuity of the dataset.

5.9 Validation of Phase 1A Remediation works by AWE SRG

The Remediation Validation Report for the Phase 1A Demolition Area should

be reviewed against the requirements of the Land Remediation Specification

(Ref. 1) for the remediation elements undertaken in the TCE Area. This shall

include checking whether or not the four known soil contamination hot spots

were removed and whether any other contamination was identified during the

demolition works. Should any of the remedial requirements not have been

implemented then further remediation may be required.



6 Remediation Verification Plan

6.1 Routine Documentation

In order to provide appropriate ‘lines of evidence’ to demonstrate to the

Regulators that that appropriate remedial works have been undertaken for

each area, various standard documentation will be required which will be

common to many of the tasks as specified above, to enable a Verification

Report to be produced.

Any remedial works, such as the removal of asbestos contaminated soils or

chemically contaminated soils, waste disposal of materials off site or capping

requirements shall be carefully documented by the Contractor. The routine

documentation of the works to be carried out by the Contractor shall include,

but not necessarily be limited to the following:

Daily record sheets detailing activities on the site;

Excavation records detailing the material in each excavation;

Excavation plans showing the dimensions and nature of each

excavation together with any sampling locations;

Details of any material changes to the remedial works due to findings

on the site;

Stockpile plans showing the dimensions and nature of stockpiled

material where appropriate;

Sample records detailing the location and composition of every sample

collected with the results of on-site inspections and verification testing;

Records of formation level inspections by AWE Appointed

Environmental Consultant;

Location and results of laboratory analysis, comparisons to SSTLs and

other remedial goals;

As built drawings, construction drawings;

Any locations where previously unidentified contaminated soils are

encountered; and



Groundwater and surface water assurance monitoring results including

a comparison with previous data.

For Duty of Care, records of contaminated soil arisings detailing waste

transfer ticket number, vehicle registration, landfill address and weight

recorded at the landfill shall be provided by the Remediation

Contractor.

The remedial actions listed in the preceding sections will require documentary

evidence including other remedial works which may require implementation

during the course of the site redevelopment works (such as yet unidentified

contamination), to demonstrate remediation has been achieved.

The following sections outline other specific protocols and requirements

necessary in order to demonstrate that remediation has been achieved in the

production of a comprehensive post remediation Validation Report for the TCE

Area.

6.2 Remediation Verification Report

A Remediation Verification Report will be prepared and will detail any remedial

works carried out and present all excavation records, plans, sample records

and verification laboratory results and a summary of the information identified

in this section.

The Remediation Verification Report will demonstrate the following were met

during the works.

Any soils exhibiting visual evidence of asbestos containing materials

and/or visual and olfactory evidence of chemical contamination not

previously identified, were subject to inspection and analysis by the

AWE appointed Environmental Consultant and the remedial goals were

met;

Any laboratory analysis of samples were undertaken using a UKAS

accredited laboratory methodology and in the case of soil analysis

MCERTS accreditation was also adopted;

The extent of contamination identified was delineated and verified by

inspections, and laboratory analysis of soils appropriate to the type of

contamination being removed was undertaken;



Analysis results of contamination were compared to the appropriate

SSTLS to determine whether contaminant levels could pose a risk and

therefore require removal / treatment;

Verification sampling to demonstrate soils remaining in the ground

following removal of contamination are below the relevant SSTLs and

not likely to pose a risk. This will be required where AWE Site

Remediation Group have undertaken previous soils remediation with

the Phase 1A.

Asbestos Containing Materials (ACMs) in soils were identified and

removed and verification sampling to demonstrate soils remaining in

the ground meet the remedial goals. Findings of the Waste Pre-

Classification Investigation Report shall also be taken into account;

Materials contaminated with asbestos or other waste soils were

disposed of to a suitably licensed landfill facility with the appropriate

chain of custody and consignment notes required under the

Environmental Protection Act, Duty of Care Regulations and AWE

Corporate Safety Instruction CSI 1706;

Any additional contamination encountered where not previously

identified, delineation testing was undertaken and where concentrations

exceeded the relevant SSTLs (after due consideration given to the

benefit of additional risk assessment), the soils were remediated or

disposed of off-site to a suitably licensed waste management facility;

Groundwater monitoring analytical results and comments on whether

any significant changes in groundwater quality were observed and if

remedial action was required; and

Records of volumes of waste removed, name of the disposal facility

and copies of waste transfer notes.

The format and contents of the Verification Report shall be compiled using

guidance provided in the Environment Agency’s Verification of Remediation of

Land Contamination (Ref. 5).



6.3 Off Site Disposal of Waste

6.3.1 Site Waste Management Plan

The Contractor shall be required to work to a Site Waste Management Plan to

meet the requirements of The Site Waste Management Plans Regulations

2008 (Ref. 18). During the works the Contractor shall seek to minimise waste

being generated and recover and re-use wastes wherever possible. The

Contractor shall provide AWE detailed information in volumes of waste

generated and volumes of waste recovered.

6.3.2 Waste Transfer Notes

Under the Environmental Protection (Duty of Care) Regulations 1991 all those

responsible for producing or handling wastes have legal requirements placed

upon them for the safe keeping, transport and subsequent recovery or

disposal. Consequently, at the basic minimum, the Contractor shall ensure that

all waste leaving site must have a Waste Transfer Note and a copy of every

Waste Transfer Note for each load leaving site must be provided to the AWE

PM.

The Waste Transfer Note as a minimum shall include detail on:

1. Type of Waste and its six digit European Waste Code;

2. What type of container is used;

3. Time, date, and place the waste was transferred to;

4. The names and addresses of both persons involved in the transfer;

5. Details of which category of authorised person each one is (i.e.

producer, waste licence holder, registered waste carrier);

6. Certificate number of registered waste carrier;

7. Waste management licence number of waste facility;

8. The name and addresses of any broker involved in the transfer; and

9. Signatures of both parties.



All Waste Transfer Notes shall be kept for a minimum of three years.

6.3.3 Hazardous Waste

Hazardous waste generated during the construction phase, will require AWE

plc to register with the Environment Agency that they intend to produce

hazardous waste and comply with the Hazardous Waste Regulations. The

AWE PM shall register the ‘premises code’ and provide the Contractor with

these details.

The Contractor shall be responsible for record keeping of all hazardous waste

materials removed from site. This record keeping shall include:

1. Maintaining records and registers of all hazardous waste removed

from site. A consignment note must be completed to accompany

hazardous waste that is removed from the site;

2. AWE shall obtain hazardous waste consignment numbers from the

Environment Agency and the Contractor shall obtain from AWE a

consignment number for each and every consignment of hazardous

waste removed from site;

3. The Contractor shall provide returns from consignees of hazardous

waste to the AWE PM so that AWE can provide completed waste

consignment returns back to the Environment Agency for each

consignment number given to the Contractor; and

4. Supply information to the Environment Agency or emergency services

at the request of the AWE PM

The Contractor shall ensure that he records the following details of all

hazardous waste consignments:

• Quantity – Quantity of waste in kilograms

• Nature – A full description of the waste and its EWC code and

components

• Origin – Name and address of the premises at which the

waste was produced



• Destination- The name and address of the Consignee

• Frequency of Collection - Where applicable

• Mode of Transport – Mode of transport used to transport

waste off site to the treatment facility

• Treatment Method – Method of disposal or recovery

• Identification of Carrier – Name and registration number of

carrier used to transport waste off site to the treatment facility

In addition to the above the Contractor shall ensure that he follows the

guidance provided in ‘A Guide to the Hazardous Waste Regulations – Records,

Registers and Returns’ (Ref. 16).

6.3.4 Waste Disposal Testing, Inspection and Verfication Requirements

The Remediation Contractor shall be responsible for any additional testing

required of wastes to facilitate disposal to a licensed waste management

facility. This shall include Waste Acceptance Criteria testing of soils and other

materials being disposed to either inert or hazardous landfills as required under

the Landfill (England and Wales) Regulations (Ref. 17).

Any such testing necessary shall be identified to the AWE PM and the

Remediation Contractor shall pass copies of any analysis results to the AWE

PM.



7 References

1. RPS, Land Remediation Specification, Demolition of Phase 1A and 1B Area

buildings, AWE Burghfield, JER3058/P1/L6, Revision 3, September 2006,

RPS PT&E;

2. CLR 11; Model Procedures for the Management of Land Contamination,

DEFRA and EA, September 2004, EA;

3. Statutory Instrument No. 320 (April 2007). Construction Design Management

Regulations (CDM). HMSO;

4. Environment Agency (June 2006), Record Keeping: A guide to the Hazardous

Waste Regulations, Reference number HWR05, version 2.0. EA;

5. Environment Agency (2006), Verification of Remediation of Land

Contamination. Science report NC/00/38/SR. EA; including Draft update

2008;

6. Initial Characterisation survey (Land Quality Assessment) Interpretive Ground

Investigation Report for Groundwater monitoring Boreholes (Section 2) at

AWE Burghfield for AWE PLC, JER2763/S2/I/F, March 2005, RPS PT&E;

7. Initial Characterisation Survey (Land Quality Assessment) Interpretative

Ground Investigation Report for Mounds and Other Areas of Interest (Section

3) at AWE Burghfield for AWE Plc, JER2763/S3/I/F, March 2005, RPS PT&E;

8. Initial Characterisation Survey (Land Quality Assessment) Interpretative

Groundwater Monitoring Report (Section 4) at AWE Burghfield for AWE Plc,

JER2763/S4/I/F, March 2005, RPS PT&E;

9. 10A Area TCE Monitoring Factual Report at AWE Burghfield for AWE PLC, JER2763/TCE/GW/F, January 2008, RPS P&D;

10. 10A Area TCE Monitoring Interpretative Report at AWE Burghfield for AWE PLC, JER2763/TCE/GW/I, February 2008, RPS P&D;

11. AWE Code of Construction Practice (May 2006). Issue 1.

EDMS1/800D99C7/B/SD4003, AWE;




12. RPS, Ground Conditions Technical Report, Project Mensa Development,

AWE Burghfield, JER3860/Mensa/GCTR, Rev 0, April 2008.

13. RPS, Ground Investigation Factual Report, TCE Contaminated Area,

Pingewood Gate, AWE Burghfield, JER3996/TCE/LQA/F, Rev 0, November

2008.

14. RPS, Ground Investigation Interpretative Report, TCE Contaminated Area,

Pingewood Gate, AWE Burghfield, JER3996/TCE/LQA/I, Rev 0, January

2009.

15. EA, Technical Guidance WM2 – Hazardous Waste: Interpretation of the

definition and classification of hazardous waste (Second Edition, Version 2.2),

Updated May 2008

16. EA, Guide to the Hazardous Waste Regulations – Records Registers and

Returns, December 2005

17. HMSO, The Landfill (England and Wales) Regulations, 2002

18. EA, The Site Waste Management Plans Regulations 2008

19. RPS, Remediation Method Statement, Project Mensa Development, AWE

Burghfield, Berkshire, JER3996/Mensa/RMS, Rev 1, November 2008

20. RPS, Chapter 10, Ground Conditions, as part of the Environmental Statement

for Project Mensa, AWE, December 2008.

21. RPS, Remediation Specification, Pingewood Gate, AWE Burghfield,

JER3996/Pingewood/RMS, Rev 1, January 2009.


RPS Planning & Development AWE (B) TCE Monitoring Area May 2009 JER3996/TCE/RMS

Drawings

Proj

ectR

ef:J

:\Dra

win

gs\J

ER

3996

Drawing No: JER3996-003 Revision: -

Date: 27/11/2008

Drawn:

Datum:

Checked:

Projection:

Job Ref:RJ RLJ JER3996

OSGB36 BNG

1:5,000Scale: A3 @0 0.250.125 km

Title: Mensa Development Proposals

Client: AWE PlcProject: Mensa Remediation Works

Conrad House Beaufort Square Chepstow Monmouthshire NP16 5EPT 01235 838200 F 01235 820351 E [email protected] W www.rpsplc.co.uk

Status: PRELIMINARY

Data Source: RPS 2008Rev: Date: Amendment: Name: Checked:

±

© Crown copyright, All rights reserved. 2008 License number 0100031673

LegendAWE Burghfield Fence Line

Project Mensa Boundary

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X

X

X

X

X

X

X

X

X

X

X

X

XX X

X

X

X

X

X

X

X

X

X

X

X

XX

X

XX

X

X X

X

X

X

X

X

X

PARK

STREET

NO10

PALMERS LANE

CON CR ETEBR I DG E

50 N

GATE20

GATE22

GATE11

GATE21

GATE10

GATE2A

GATE 1

GATE13

GATE2B

GATE 3

GATE 4

GATE 5

GATE 6

GATE7

GATE 7A

GATE 7B

GATE 8

GATE 15

GATE 9

16

X

X X X X X X X X X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

10G11

CARPARK

8.C.1A

8.F.1010.F.5.A10.F.5

8.A.1C

8.A.1

8.A.2

8.T.15

8.A.2A

8.C.2

8.C.2.A

8.A.3

8.R.8

8.A.4

8.A.5

8.A.6

8.L.3

10.F.10

10.C.1710.C.35

10.A.31

10.A

. 14

10.A.13B

11.D.9A

11.D.6

8.L.28.N.2

8.F.4

8.F.5

8.S.24

8.S.22

8.N.5

10.A.1

8.F.6

9.B.6

9.B.5

9.B.2

9.B.3

9.B.11

11.D.3

10.G.1

10.G.2

11.D.4

10.G.4

10.G.3

11.D.5

8.T.1

8.S.2E

8.Z.11

8.H.1

11.D.2

11.D.11.A

11.D.11

10.G.5

8.0.18.S.3

8.Z.1

10.A.1C

10.F.18.A

8.G.98.F.8

8.S.25

8.F.17.A8.F.17

9.B.1

8.N.6

9.B.1.A

8.B.2

8.M.2

8.P.1

8. P.2

8.T.2

8.K.1

8.K.2

8.Q.1

8.B.1

8.R.4

8.Z.3

8.T.3

8.C.4N

8.S.1

8.Z.2

10.A .1

3

10.A.8

10.A.1E

8.F.15A

EL SUB

10.A

.1 3A

10.A.30

10.A.18.C

10.A.18.B

10.A.18

10.A.12

10.A.19

10.A.19.

A

10.A.16

10.A.33

10.A .20

10.A.20.A

10.A.4

10. A.2

1

10.A .5

10.A.6

8.F.15

10.A.9

10.A.7

12.A.2212.A

.17

10.A.23.

A&B

11.D.9

8.S.26

8.F.12

(DISUSED)

8.F.3B

8.T.7

8.Z.5A & B

8.C.3A

(DISUSED)

8.T.4

(DISUSED)

8.G.10

8.F.7

8.E.1

10.F.16

8.F.7A8.N.3

8.M.1

8.F.7B

10.F.15

8.C.3B(DISUSED)

8.S.6

10.F.22

10.F.13

8.R.68.G.7

8.G.8

8.Z.58.G.5

8.G.6

8.Z.6

8.Z.7

8.G.4

8.G.3

8.G.1

8.G.2

8.Z.8

8.R.9

8.S.19

8.D.1A8.U.1 8.D.2A

8.D.18D.3B

8.Z.9

8.Z.10 8.F.1

10.A.1B

8.F.3A

8.F.1A

8.T.5

8.S.5

8.S.5A

8.F.2

9.B.10

8.E.3B8.C.10A

8.E.3

8.E.3A

8.A.7

8.U.28.X.1

8.T.8

8.R.10

8.C.6

8.C.5

8.C.8

8.C.7

10.F.248.R.19

8.S.8

8.C.5A

8.J.5

8.J.5A

8.D.5

8.S.11

8.B.5

8.D.4

8.C.9B

8.B.3

8.B.4

8.J.7

8.R.17

8.J.6

8.J.6.A

8.R.11 8.C.9

8.T.13

8.E.2A

8.F.3 8.S.23

10.F.2

8.C.10B

8.D.3

8.D.3A

8.C.9A

8.C.11B

8.S.9 8.L.4

8.S.10

8.S.12

8.T.108.R.13

8.T.12

8.E.2

8.C.10

8.C.12

8.C.11

8.S.14 8.S.15 8.S.78.S.13

8.T.11

8.P.3 8.K.38.O.2

8.S.16

8.Q.2

8.S.188.T.14

1.F.11A10.F.3

1.F.11

11.R.211.R.1A11.R.8

11.R.8A11.R.7

11.R.3,3A,3B11.R.4A

11.R.5

11.R.4

10.C.31

10.C.1

10.G.7

12.A.12

11.A.911.A.5 A&B

11.A.6

11.A.4 11.A.3

10.C.13.E

11.A.3A-3D

11.A.1

11.A.2

10.E.1

12.A.1610.F.11

10.C.13 .F

10.C.13 .C

10.C.13.A

10.C.13

10.C.10

10.C.20

12.A.13

12.A.14

12.A.810.F.6

11.A.7

11.A.8

10.C.1.B

10.C.1.A

10.C.32

10.C.5

10.C.6

10.C.3

10.C.36

10.C.8

10.C.7

10.C.9

10.C.14

8.L.18.A.1A 8.A.1B

11.D.1

11.D.1011.D.7

10.F.810.F.19

10.F.17

10.F.18

10.F.7

10.F.1

8.0.5

8.F.9

8.F.14A

8.F.14

11.D.8

10.A.1D

8.F.16

8.F.12A

STN

10.A.10

10.A.23

10.F.9

10.A.18A

8.C.1B

10.F.4

8.J.4A

8.J.4

8.C.11A

8.R.188.U.3

8.T.6

9.B.7BEDS

10.A.1A

11.R.6(RUIN)

10.F.12

8.F.8.B

8.G.9.A8.F.8.A

11.A.11

MAIN GATE

12.A.12

12.A.20

12.A.26

12.A.25

12.A.24

SHED

STORE

1.F.11E

11.A.11

10.A

. 17

10.D.17

11.R.1

HUT

FILTER

9.B.8

10.C.13.G

11.A.13

9.B.4

10.A.9A

12.A.11

10.F.16A

10.F.9A

10F23

8.J.7

10.A.11

10G810G9

PUMPING STATION

10.F.21

8.R.5

8.S.2W

8.C.4S

8.J.3A

8.J.1A

8.J.2A

8.J.3

8.J.1

8.J.2

!(!(

!(

!(

!(

!(

#*

#*

#*

AA

Outfall 7

Outfall 4

Borehole 2

Borehole 1

Outfall 5

Outfall 2

Outfall 1

Outfall 3 & 6

Surface Water Sampling Point

Burghfield Brook Sampling Point

Burghfield Brook Sampling Point

Proj

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3996

Drawing No: JER3996-004 Revision: -

Date: 28/11/2008

Drawn:

Datum:

Checked:

Projection:


OSGB36 BNG

1:5,000Scale: A3 @0 0.20.1 km

Title: Site Map Indicating Groundwater SourceProtection Zones & AWE Water Monitoring Locations

Client: AWE Plc

Project: Mensa Remediation Works


Status: PRELIMINARY


±


LegendAWE Burghfield Fence Line

Mensa Application Area

Burghfield Brook - Current Course

Burghfield Brook - Old Course

!( Licensed Outfall

!( Outfall Waiting Consent by EA

#* AWE Burghfield Brook Sampling Point

#* AWE Surface Water Sampling Point

A Groundwater Abstraction Borehole

Source Protection Zone1 Inner Zone

2 Outer Zone

3 Catchment

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GF

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GF

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GF

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GF

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GF

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GF

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GFGF

GF

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&A

&A

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3 Stage Interceptor Pit

Pump Pit

Interceptor

3 Stage Interceptor Pit

Carbon Filter (Installed Nov. 2004)

Pump Chamber Manhole

Outfall 1

BH225S

TPCMR002

TPCMR001

BHCMR004

CBRCMR005

1AHP1

1AWS1

1AHP3

1AHP2

1ABH3

1AWS91AWS8

1AWS7

1AWS6

1AWS5

1AWS4

1AHP8

1AHP7

1AHP6

1AHP5

1AHP4

1ABH2

1ABH1

1AWS3A

1AHP1C

1AHP1B1AHP1A

1AWS13

1AWS121AWS11

1AWS10

1AHP4C - F

1AHP4B

1AHP4A

10A9(2)

10A9(1)

10A17(2)

10A17(1)

10A13(1)

10A13B(2)10A13B(1)

10A13A(1)

1AHP9/WS14

B/G8

B/E7

B/GM5

SW3

TP186

TP149

TP148

TP146

TP144

PH182

PH181

PH180

PH179

PH178

PH177

PH175

PH174

PH173

PH172

BH104

BH147

BH187

TP147A

BH185 (R)

PH176

BB11

K2

K1

G3

H3J2

J1

H2F3

G2

H1

G1

F1

F2

E3

E2

E1

D3

D2

D1

C1

B1

A1

E3A

E2A

E1A

BC3

BC2

D3AD2A

D1A

C1A

B1A

A1A

269/159(A)268/159(C)

WS-TCE-04

WS-TCE-02

WS-TCE-01

WS-TCE-06

WS-TCE-09

WS-TCE-07

WS-TCE-10

WS-TCE-03

WS-TCE-05

WS-TCE-08

SW3

DS-TCE-12

DS-TCE-06

DS-TCE-02

DS-TCE-03DS-TCE-10

DS-TCE-11

DS-TCE-05

DS-TCE-01

DS-TCE-04

DS-TCE-09

DS-TCE-08

DS-TCE-07

Outfall 1

10A18

10A21

11D9

10A19

10A6

10A8

10A10

10A12

10A4

10A20

10A19A

Proj

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3996

Figure No: JER3996-TCE-001b Revision: B

Date: 17/04/2008

Drawn:

Datum:

Checked:

Projection:

Job Ref:RJ AJC JER3996

OSGB36 BNG

1:1,000Scale: A3 @0 0.030.015 km

Title: Sampling Locations

Client: AWE PlcProject: Mensa TCE Investigation


Status: PRELIMINARY


±


LEGENDAWE Burghfield Fence Line

Burghfield Brook (Current Course)

Burghfield Brook (Former Course)

Approximate Extent of Alluvium BoundaryBased on BGS 1:10,000 Geology Map

Approximate Extent of Former Site Tip

Mensa Application Area

Phase 1A Buildings (Demolished)

GF Manhole Locations

Drain StatusGood Working Order

Joint May Leak

Contains Debris & Silt

Water Holiding

Collapsed Pipe

Joint May Leak / Contains Debris & Silt

Water Holding / Contatins Debris & Silt

Un-Surveyed, Assumed Drain Types / AlignmentsFrench Drain (No Pipes/Connectivity)

Surface Water French Drain

Surface Water Storm Drain

Assumed Drainage Alignment

LEGEND (Investigation Locations)Sampling Locations

!! Drainage System Sampling Point

!! Borehole with Monitoring Well&A Window Sample Location

AWE Burghfield Investigation LocationsLQA Supplementary Investigation (2006)

&? Borehole with Monitoring Well (Shallow)

CMR Exploratory Holes (2005-2006)

BA Trial Pit

#

CBR Investigation Location

Phase 1 Demolition Area LQA (2005)&A Borehole with Monitoring Well (Deep)

&? Borehole with Monitoring Well (Shallow)

&A Probehole with Monitoring Well (Shallow)

&? Probehole

�S§ Hand Dug Pit - Geophysical Anomalies

�

Sediment Sample

Gas Ring Main Investigation (2004)BA Trial Pit

Initial Characterisation Survey LQA (2003-2004)&A Borehole with Monitoring Well

&? Probehole with Monitoring Well

BA Trial Pit

# Surface Water Sampling Point

Burghfield Brook Investigation (2003)&A Borehole

Taylor Woodrow Mound A Investigation (1994)!( Borehole

BGS Reference Boreholes&A Borehole

Drain Status based on "Waterflow - CCTVSurvey Report" (for Golders Associates) April 2005Un-surveyed, Assumed Drain Types Based on CAD FilesSupplied by AWE Plc

A 24/07/08 Revised Mensa Boundary & Sampling Locs RJ AJCB 10/09/08 Surveyed Locations, 2008 Basemap RJ DJB

TRIDENT

WAY

CAR PARK

STREET

NO.8

STREETNO.12

TRIDENT

WAY

STREETNO.11

STREETNO.15

STREET

NO10

FUL

STREET

NO10

10.A.1

3B

10.A.8

10.A.30

10.A.1

8.C

10.A.18.B

10.A.1

8

10.A.12

10.A.19

10.A.19.

A

10.A.16

10.A.33

10.A.2

0

10.A.20.A

10.A.4

10.A.2

1

10.A.6

10.A.7

12.A.22

12.A.1

710.A.23.

A&B

11.D.9

10.A.10

10.A.23

10.F.9

10.A.18A

12.A.12

10.A.9A

10.F.9A

10.A.11

10G8 PUMPING

!! #

@A

@A

@A

@A

@A

@A

@A

@A

@A

@A 1ABH3

1ABH1

Outfall 2

Outfall 1

SW3

PH176

PH173

BH104WS-TCE-09

WS-TCE-08

WS-TCE-06

WS-TCE-05WS-TCE-04

Proj

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3996

Figure No: JER3996-TCE-003 Revision: 0

Date: 09/02/2009

Drawn:

Datum:

Checked:

Projection:


OSGB36 BNG

1:1,000Scale: A3 @0 0.030.015 km

Title:Remediation Plan -TCE Monitoring Area

Client: AWE PlcProject: Mensa TCE Investigation


Status: CHECKED & APPROVED


±


LEGENDAWE Burghfield Fence Line

Burghfield Brook (Current Course)

Approximate Extent of Former Site Tip

Project Mensa Boundary

Area Requiring Inspection by

# Surface Water Monitoring Point! Outfalls

BH104, PH173, PH176, WS-TCE-04,WS-TCE-05, WS-TCE-06, WS-TCE-08,WS-TCE-09

INSETScale: 1:15,000

@AGroundwater Monitoring WellsRequiring Protection(for VOC Analysis including TCE)

1ABH1, 1ABH3

Sampling Locations

@AGroundwater Monitoring WellsRequiring Protection

Environmnetal Consultant



Appendices


Appendix A

Summary of TCE Area Site Specific Target Levels (SSTLs)


JER3996 Mensa Site Specific Target Levels

SUMMARY OF CLEA UK DERIVED GENERIC ASSESSMENT CRITERIA (GAC)and SGVs USED WITHIN THE HUMAN HEALTH RISK ASSESSMENT

Organics

Acenaphthene 88,000 CLEA UK Aromatics >C10 – C12 608 CLEA UK

Anthracene 440,000 CLEA UK Aromatics >C12 – C16 12,500 CLEA UK

Benzo(a)anthracene 281 CLEA UK Aromatics >C16 – C21 9,210 CLEA UK

Benzo(a)pyrene 28.1 CLEA UK Aromatics >C21 – C35 9,210 CLEA UK

Benzo(b)fluoranthene 281 CLEA UK 1,1,1 - Trichloroethane 551 CLEA UK

Benzo(ghi)perylene 44,000 CLEA UK Trichloroethene 6.46 CLEA UK

Benzo(k)fluoranthene 281 CLEA UK cis 1,2, Dichloroethene 1.87 CLEA UK

Chrysene 28,100 CLEA UK Benzene 1.67 CLEA UK

Dibenzo(ah)anthracene 28.1 CLEA UK Xylenes 344 CLEA UK

Fluoranthene 2,810 CLEA UK Bis (2-ethylhexyl)phthalate 1,120 CLEA UK

Fluorene 58,700 CLEA UK Dibenzofuran 625 CLEA UK

Indeno(123-cd)Pyrene 281 CLEA UK 1,1-Dichloroethane 1.04 CLEA UK

Naphthalene 290 CLEA UK 1,1-Dichloroethylene 1.24 CLEA UK

Phenanthrene 58,600 CLEA UK Maneb 1,560 CLEA UK

Pyrene 44,000 CLEA UK 2-Methyl Naphthalene 1,250 CLEA UK

C5-C6 41.6* CLEA UK Thiocyanate 61.5 CLEA UK

C6-C7 41.6* CLEA UK 1,1,2-Trichloroethane 0.634 CLEA UK

>C8 - C10 64.1* CLEA UK 1,2,3-Trichloropropane 2.24 CLEA UK

Aliphatics >C8 - C10 64 CLEA UK 1,2,4-Trimethylbenzene 1.53* CLEA UK

Aliphatics >C10 - C12 31,300 CLEA UK 1,3,5- Trimethylbenzene 1.09 CLEA UK

Aliphatics >C12 - C16 31,300 CLEA UK 4-Chlorotoluene 25,800 CLEA UK

Aliphatics >C16 - C21 614,000 CLEA UK Chlorobenzene 9.38 CLEA UK

Aliphatics >C21 – C35 614,000 CLEA UK 1,2-Dichlorobenzene 99.2 CLEA UK

Aromatics >C8 – C10 106 CLEA UK PCBs (non dioxin-like mixture) 3.13 CLEA UK

PCBs (dioxin-like mixture) 0.00063 CLEA UKCarbazole 14.7 PRGDi-n-butylphthalate 1810 PRGDibutyltin 53.7 PRG

Dieldrin 0.963 CLEA UK

Metals

Antimony 1,880 CLEA UK

Beryllium 1,960 CLEA UK

Cobalt 1,280 CLEA UK ExplosivesCyanide 50 Sniffer

Manganese 15,325 CLEA UK

Molybdenum 9,250 CLEA UK

Strontium 176,150 CLEA UK HMX 34,776 CLEA UK

Thallium 30 CLEA UK RDX 140 CLEA UK

Titanium 52,606 CLEA UK TNT 432 CLEA UK

Vanadium 468 CLEA UK Picric Acid No tox data NA

GAC (mg/kg)Determinant

GAC (mg/kg) Origin

Determinant GAC (mg/kg) Origin GAC (mg/kg) OriginDeterminant

Determinant

Origin

JER3996 Mensa Site Specific Target Levels

SUMMARY OF CLEA UK DERIVED GENERIC ASSESSMENT CRITERIA (GAC)and SGVs USED WITHIN THE HUMAN HEALTH RISK ASSESSMENT

Organics

Ethylbenzene 48,000 SGVPhenol 21,900 SGVToluene 150 SGV

Metals

Arsenic 500 SGVCadmium 1,400 SGVChromium 5,000 SGV

Lead 750 SGVMercury 480 SGVNickel 5,000 SGV

Selenium 8,000 SGV

Determinant SGV (mg/kg) Origin

Determinant SGV (mg/kg) Origin

Documents

Remediation Method Statement TCE Monitoring Area, AWE ... · The remediation method statement has been developed to outline contractor requirements to manage or mitigate contamination