Remediation Specification Pingewood Gate, AWE Burghfield AWE plc. Prepared by: Authorised by: Chris Warde Rob Jones Conrad House Beaufort Square Chepstow Monmouthshire NP16 5EP Tel 01291 621821 JER3996/Pingewood/RMS Fax 01291 627827 Revision: 1 Email [email protected] January 2009 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 Planning & Development Remediation Specification, Pingewood Gate Contents Contents .............................................................................................................i 1 Introduction ................................................................................................ 1 1.1 Background................................................................................................. 1 1.2 Report Scope .............................................................................................. 1 1.3 Remediation Objectives ............................................................................. 2 1.4 Structure of Report..................................................................................... 3 2 Summary Site Setting ................................................................................ 4 2.1 Introduction................................................................................................. 4 2.2 Site Location and Description ................................................................... 4 2.2.1 General Description of the Pingewood Gate Area ............................. 4 2.2.2 Environmental Setting........................................................................ 5 3 Remediation Specification ........................................................................ 6 3.1 Introduction................................................................................................. 6 3.2 General Procedures During Excavations in Potentially Contaminated Soils………............................................................................................................. 7 3.3 Asbestos Control and Disposal Measures............................................... 8 3.4 Procedures for Encountering Unidentified Contamination .................. 10 3.5 Potential TCE Impacted Soils .................................................................. 12 3.6 Lead Contamination in Soils ................................................................... 12 3.7 General Waste Handling Arrangements ................................................. 13 3.8 Explosives and UXO Safety Management System ................................ 14 3.9 Groundwater Assurance Monitoring Programme ................................. 14 4 Remediation Verification Report ............................................................ 16 4.1 Routine Documentation ........................................................................... 16 4.2 Remediation Verification Report ............................................................. 17 4.3 Off Site Disposal of Waste ....................................................................... 18 RPS Planning & Development i AWE Burghfield January 2009 JER3996 Remediation Specification, Pingewood Gate 4.3.1 Site Waste Management Plan ......................................................... 18 4.3.2 Waste Transfer Notes...................................................................... 18 4.3.3 Hazardous Waste ............................................................................ 19 4.3.4 Waste Disposal Testing, Inspection and Verification Requirements 20 5 References................................................................................................ 22 RPS Planning & Development ii AWE Burghfield January 2009 JER3996 Remediation Specification, Pingewood Gate Drawings JER3996 – 001 Existing Site Layout JER3996 – PG – 005 Site Location Plan JER3996 – PG – 012 Remediation Plan RPS Planning & Development iii AWE Burghfield January 2009 JER3996 Remediation Specification, Pingewood Gate 1 Introduction 1.1 Background RPS Planning and Development (RPS) have been commissioned by AWE plc to produce a Remediation Specification for the Pingewood Gate development area, which is part of the proposed Project Mensa Facility Development at AWE Burghfield (AWE (B)). An overarching Remediation Method Statement (RMS) for the Project Mensa Facility Development has already been published by RPS for the wider Mensa Application Site area (Ref. 1). 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 Burghfield, with part of the project involving the redevelopment of land near the Pingewood Gate in the north-east corner of the site. It is proposed that a new vehicle inspection and access point and the Primary Intake Substation be constructed in the Pingewood Gate area. The long term plan is for the vehicle inspection area to be replaced with soft landscaping once the Mensa project construction has been completed. The Mensa Application Site area is shown on Drawing JER3996-001 and includes temporary areas to be used during the construction of the Main Mensa Development. For the purposes of this Specification, the Pingewood Gate area is delineated on Drawing JER3996-PG-005 and pertinent features referenced in this Specification are provided on Drawing JER3996-PG-012. 1.2 Report Scope Numerous site investigations and land quality reports have been undertaken across the site to identify ground contamination, and following assessment and characterisation, a number of risks from shallow soil contamination have been identified in the Pingewood Gate development area. A Summary of the identified risks and recommendations to mitigate these within Pingewood Gate development area are outlined in the Mensa Ground Conditions Technical Report (Ref. 3) (GCTR) and in the Pingewood Gate RPS Planning & Development 1 AWE Burghfield January 2009 JER3996 Remediation Specification, Pingewood Gate Interpretative Report (Ref 4). Reference should be made to these reports for more detail, but pertinent risks can be summarised as: Encountering previously unidentified contaminants (including Asbestos Containing Materials (ACMs)) causing a risk to construction workers and future site users; The potential for a source of Trichloroethene (TCE) contamination in shallow soils associated with the former 10A buildings. Identified hotspots of lead contaminated soils in shallow soils at two locations; and Potential for previously unidentified exploded ordnance causing a risk to construction workers and future site users. In addition chemical concentrations of certain contaminants above the laboratory testing limits of detection have been encountered in groundwater in the vicinity. Concentrations identified are not considered to pose a potential risk to local groundwaters, abstractions or surface waters, however, assurance monitoring of groundwater is to be undertaken prior, during and post the Pingewood Gate construction phase as part of the ongoing groundwater assurance monitoring programme for the main Mensa development. 1.3 Remediation Objectives This Remediation Specification has therefore been developed to outline Contractor requirements to manage or mitigate contamination risks during the development of the Pingewood Gate, including: 1. Providing appropriate methodologies on the identification, delineation, assessment and remediation of known or previously unidentified contamination, encountered during construction 2. Outlining procedures to protect construction workers, AWE staff and site visitors and the general public from contaminants during construction; 3. Providing requirements for remediation verification to demonstrate that remedial targets and objectives have been met (Remediation Verification Plan); and, RPS Planning & Development 2 AWE Burghfield January 2009 JER3996 Remediation Specification, Pingewood Gate 4. Identifying requirements for remediation supervision or independent inspection of contamination or remediation by the AWE Appointed Environmental Consultant during the construction works; 5. Requirements for appropriate characterisation and sentencing of contaminated soils for off site disposal or retention on site, as required; 6. Protocols for material handling, stockpiling and waste management procedures for off site disposal; 7. Defining monitoring wells which need to be protected during the Pingewood Gate construction phase to maintain the ongoing site wide groundwater assurance monitoring programme; 8. Outlining requirements for record keeping and specific documentation necessary for validating all the above to allow the independent production of a Verification Report. 1.4 Structure of Report The remainder of this document is divided into the following sections: Section 2: Summary Site Setting; Section 3: