jubilee riverside south mill lane, taplow remediation … · 2015. 6. 5. · report (ramboll,...

Intended for

Berkeley Homes (Three Valleys) Ltd

Document type

Report

Date

May, 2015

Job No

61033137

JUBILEE RIVERSIDE

SOUTH

MILL LANE, TAPLOW REMEDIATION

STRATEGY

REMEDIATION STRATEGY

Ramboll

240 Blackfriars Road

London

SE1 8NW

United Kingdom

T +44 (0)20 7631 5291

www.ramboll.co.uk

Revision I03

Date 14/05/2015

Made by Tom Smith

Checked by Niki Dubber

Approved by Simon Corness

Description Remediation Strategy

Ref 61033137.E.JRS.RS.I03

Revision History

Revision Date Purpose / Status

Document Ref. Comments

I01 02.04.2015 Draft for Discussion

61033137.E.JRS.RS.I01

I02 13.04.2015 Final Issue 61033137.E.JRS.RS.I02 Update following client comments

I03 14.05.2015 Re-issue 61033137.E.JRS.RS.I03 Update following Local Authority and Environmental Agency Consultations

Prepared By Reviewed By Approved By

Tom Smith Niki Dubber Simon Corness

Senior Environmental Consultant

Senior Environmental Consultant

Project Director

Remediation Strategy

CONTENTS

1. INTRODUCTION 1 1.1 Brief 1 1.2 Scope and Objectives 1 1.3 Proposed Development 1 1.4 Pertinent Information 2 1.5 Constraints and Limitations 2 1.6 Roles and Responsibilities 2 2. ENVIRONMENTAL SETTING SUMMARY 3 2.1 Site Setting 3 2.2 Site Zoning / Nomenclature 3 2.3 Site Location and Description 3 2.4 Site History 4 2.5 Ground Investigations 4 2.6 Geology 5 2.7 Visual / Olfactory Evidence of Contamination 6 2.8 Hydrogeology 6 2.9 Hydrology 6 2.10 Ground Gas 6 2.11 Ground Contamination 7 3. REMEDIATION STRATEGY 10 3.1 General Site Environmental Controls 10 3.1.1 Air Quality and Dust 10 3.1.2 Noise and Vibration 11 3.1.3 Oils, Fuels and Chemicals 12 3.1.4 Unforeseen Contamination Protocol 12 3.1.5 Surface Water Management 13 3.1.6 Baseline & Long Term Water Monitoring 14 3.1.7 Borehole Decommissioning 14 3.1.8 Material Re-use 15 3.1.9 Material Import 16 3.1.10 Waste Disposal 17 3.1.11 Groundwater in Excavations 18 3.2 Specific Stage 1 Remedial Works 19 3.2.1 Site Clearance and Underground Structures 19 3.2.2 Asbestos Management Procedures 20 3.2.3 Service Corridors 20 3.3 Site Conditon Requirements upon Completion of Stage 1

Remedial Works 21 3.4 Specific Stage 2 Remedial Works 21 3.4.1 Capping System 21 3.4.2 Foundation Works Risk Assessment 22 3.4.3 Ground Gas Protection Measures 22


3.5 Site Conditon Requirements upon Completion of Stage 2

Remedial Works 23 4. VERIFICATION PLAN 24 4.1 Environmental Watching Briefs 24 4.2 Verification Plan 24 REFERENCES 26

APPENDICES

Appendix 1 Figures/Drawings

Appendix 2 Testing Suites and Chemical Criteria for Baseline and Long Term Water

Monitoring

Appendix 3 Chemical Criteria for the Protection of Human Health (Re-use or Importation) –

Private Gardens


Communal Soft Landscaped Areas


Clean Service Corridors

Appendix 6 Consultations With Regulators


1. INTRODUCTION

1.1 Brief

Ramboll have been appointed by Berkeley Homes (Three Valleys) Ltd to provide engineering

consultancy services for the proposed redevelopment of the masterplan at the site known as Mill

Lane, Taplow, South Bucks shown in Figure 1.1. As part of this appointment Ramboll have been

requested to prepare a Remediation Strategy specific to the Jubilee Riverside South site also

shown in Figure 2.2.

At the time of preparing this strategy a planning application had not been submitted for the site.

However, it is understood that this document will be submitted in support of anticipated condition

discharge following submission and approval of planning permission.

During the preparation of this Strategy Ramboll has undertaken consultations and agreed the

strategy with the Regulators. Details of consultations are contained within Appendix 6.

This report presents an overview of the ground contamination data retrieved during the recent

ground investigations and proposed an approach for remediating the site to make it suitable for

its proposed end use.

1.2 Scope and Objectives

This Remediation Strategy has been prepared by Ramboll at the instruction Berkeley Homes

(Three Valleys) Ltd. The scope of this report comprises the following:

Summary of existing ground investigation data within the Jubilee Riverside South site;

Preparation of a Remediation Strategy for the site;

Outline of the Verification Plan for the site.

This strategy does not include geotechnical issues which will be addressed separately.

1.3 Proposed Development

The Jubilee Riverside South site forms part of the planning application A package of the wider Mill

Lane site which includes full application and conservation area consent for demolition of existing

mill buildings, warehouses, associated structures and former Skindles hotel to provide 141 new

dwellings and 40 senior living apartments, restaurant, improvements to existing boatyard,

enhanced open space, new pedestrian footway and cycle links, car parking, enhanced

biodiversity, flood mitigation measures, removal of TPO trees and re-provision on-site, retention

and refurbishment of historic buildings on site into 18 further dwellings, new road junction,

landscaping and associated works.

With specific reference to Jubilee Riverside South the proposed development includes demolition

of the former Severnside warehouses and associated structures and enabling works to provide 42

new dwellings, enhanced areas open space and associated infrastructure works.


1.4 Pertinent Information

This report has been prepared with reference to the following sources of information which

Berkeley Homes (Three Valleys) Ltd either own or have been granted reliance upon.

Table 1.1 - Information Sources

Report Author Date

Ground Contamination Interpretative Report, Mill Lane, Taplow ref 61033137.E.GCIR.I01

Ramboll March 2015

Geoenvironmental and Geotechnical Desk Study, Mill Lane, Taplow ref 33137.E.DSA.I03

Ramboll March 2015

Site Investigation No 3600/14 Factual Report Terramech Investigations Ltd

February 2015

Zone 2 Taplow Mill ref 100866/RA-Z2/001. Provectus Group (Provectus)

December 2013

1.5 Constraints and Limitations

This report has been prepared for the exclusive use of Berkeley Homes (Three Valleys) Ltd and

should not be used in whole or in part by any third parties without the express permission of

Ramboll in writing. This Remediation Strategy has been prepared with reference to the

information sources presented in Table 1.1 which Berkeley Homes (Three Valleys) Ltd either own

or have reliance upon. Where external sources have been used Ramboll cannot offer any

guarantees or warranties for the completeness or accuracy of information.

1.6 Roles and Responsibilities

The Contractor will be required to develop this document to produce detailed protocols and

management plans including method statements for the works to be undertaken defining how

potentially contaminated soils will be managed and handled onsite and how the associated

environmental risks will be managed. The contractor will be responsible for the onsite testing

and verification process.

The details of these protocols will need to be agreed by the Contractor with the Regulators at

South Bucks District Council before works commence at the site and shall form part of the

Verification Report which will need to be prepared on completion of the ground works.

During the site works the Contractor will be responsible for undertaking regular (monthly)

dialogue with the regulators and for obtaining and maintaining a record of information required

for verification. These records will be checked by Ramboll during periodic site audits of relevant

site documentation. The Contractor will need to provide a copy of these records on completion of

the ground works to Ramboll and deal with any queries arising during the verification process.


2. ENVIRONMENTAL SETTING SUMMARY

2.1 Site Setting

The site setting is covered in detail in the Geoenvironmental and Geotechnical Desk Study

Ground and Geotechnical Assessment (Ramboll, 2015) and Ground Contamination Interpretative

Report (Ramboll, 2015). The site location and proposed layout are contained in Figure 2.1 and

Drawing 406.PL.100 by Berkeley Homes dated January 2015.

2.2 Site Zoning / Nomenclature

Historically the Jubilee Riverside South site has been identified using several names, generally

related to geographical/historical context, the configuration of historical ground investigations

and averaging areas adopted as part of the risk evaluation process. A summary of this

nomenclature is provided in Table 2.1 below.

Table 2.1- Jubilee Riverside South Nomenclature

Development Area Pre Ramboll Desk Study (pre 2014)

Ramboll Desk Study Ramboll Ground Contamination Interpretative Report

Jubilee Riverside South

Severnside / Zone 2 Severnside / Zone 2 Averaging Area C.

2.3 Site Location and Description

The site is located approximately 350m west of the village of Taplow, and to the north of the A4

(Bath Road) at an approximate National Grid Reference of 490419, 181813. The site is roughly

triangular in shape and covers an area of approximately 2.5 ha.

Jubilee Riverside South (hereafter referred to as ‘the site’) is occupied by an area of concrete

hardstanding, two warehouses and associated outbuildings formerly used by Severnside

Recycling for paper recycling associated with the St Regis Paper Mill which ceased operations in

2007. The site is bound to the north and west by Mill Lane, to the east by the Jubilee River and to

the south by the Maidenhead Gas Holder Station.

The open concrete hardstanding formerly used as stock areas cover the majority of the site. The

buildings present are in the northwest and southern parts of the site. A large above ground water

storage tank formerly used for a fire suppression system is present in the northwest corner of the

site adjacent to a pump house and porta-cabins formerly used as the site security offices. Two

large portal framed warehouse buildings formerly used as the paper production sheds are present

in the central southern part of site with outbuildings formerly used as a canteen and offices also

present in the south. A fenced area with concrete pads that formerly supported an electricity

substation is present to the south of the production sheds.

Within the interior of the paper production sheds there are several large depressed areas of

hardstanding that are suspected to have formerly housed plant; these areas are now partially

infilled with rainwater and general waste including drums, polythene bags and several office

chairs. A small vehicle maintenance area is present in the north of the production shed which

contains two elongated rectangular inspection chambers and further evidence of general dumping

of waste. A raised concrete pad is present immediately to the north of the production shed which

is suspected to have formerly supported an above ground fuel storage tank. Evidence of

associated infrastructure (fuel gauge) was found remaining on the production shed wall. Due to

the age of the buildings it is also anticipated that material containing asbestos will be present

within the building fabric.


The margins of the area have been fly-tipped with stockpiles of builder’s rubble, metal work, road

cones and barriers, car tyres, fabric, drums etc. noted throughout the area.

2.4 Site History

Prior to the 1960’s the site is understood to have been occupied by undeveloped open land with

Mill Lane located at the western boundary and a potential mill run to the east which was later

engineered into the Jubilee flood relief channel in the 2002 (Jubilee River). Since the 1960’s the

site is found in largely the same configuration as is currently present with warehouse structures

located in south which doubled in size by the 1999 OS Map. The site is understood to have been

operated by Severnside as a Recycling Facility during this period which ceased to operate in 2006

when the neighbouring St Regis Paper Mill closed down.

Within the vicinity of the site significant potentially contaminative end uses include the St Regis

Paper Mill (north), boatyards (west), garages (south) and the Mill Lane gas works and gas holder

station present to the south and southwest of the site.

2.5 Ground Investigations

A number of third party reports and ground investigations have been completed at the site since

the early 2000’s and have generally been undertaken as part of the sites closure, a subsequent

planning application and latterly as part of vendor due diligence ahead of a change in site

ownership. To date ground investigations have been undertaken by Conestoga Rovers Associates

(CRA) in 2006, AIG Engineering Group (AIG) in 2007 and Provectus in 2013. These ground

investigations are discussed fully within the Geoenvironmental and Geotechnical Desk Study

(Ramboll, 2015).

In order to further increase the understanding of the prevailing geoenvironmental conditions and

contamination issues at the site further ground investigation was undertaken at the site in

2014/15 by Terramech Investigations Ltd which was designed and monitored by Ramboll.

The Terramech/Ramboll ground investigation was undertaken between November 2014 and

March 2015 and within Jubilee Riverside South comprised 3No dynamically sampled and rotary

cored boreholes to a maximum depth of 20mbgl (RBH10 to RBH12), 5No windowless sampled

boreholes to a maximum depth of 6mbgl (RWS19 to RWS23) and 8No trial pits to a maximum

depth of 2.8mbgl (RTP03 to RT08 and RTP19 to RTP20). A series of static cone penetrations tests

were also undertaken for geotechnical purposes. Following the ground investigation an additional

6No rounds of ground gas and groundwater level monitoring was undertaken along with 3No

rounds of groundwater samples. A series of strategically located surface water samples were also

collected on 3No occasions. Chemical analysis of soil, groundwater and surface water samples

collected as part of the ground investigation was also undertaken.

A summary of the exploratory locations advanced as part of the Ground Investigations to date is

included in Figure 2.3.


2.6 Geology

The stratigraphy encountered within Jubilee Riverside South is summarised below in Table 2.2.

Table 2.2 - Summary of Jubilee Riverside South Stratigraphy

Stratum Top Depth

(mbgl)

Top Depth

(mAOD)

Thickness

(m)

Typical Description

Made Ground Ground Level 25.01 to

23.42

0.29 to 3.2 Cohesive Made Ground - Firm brown slightly

sandy, gravelly clay or silt. Granular

inclusions are of flint, brick, concrete, slag,

coal and plastic.

Granular Made Ground - medium dense

grey and black to orangish/reddish brown

slightly sandy and locally clayey gravel of

flint, brick, concrete, slag, coal, tile and

plastic

Alluvium 0.8 to 1.8 23.81 to

22.53

0.3 to 1.4 Discontinuous of firm to locally stiff,

orangish brown to dark grey, sandy locally

gravelly clay with locally frequent rootlets.

Granular inclusions are of sub-angular and

rounded fine to coarse flint and rarely fine

to medium chalk

River Terrace

Deposits

0.29 to 3.2 24.58 to

21.39

3.35 to 6.6 Loose increasing to medium dense and

dense, orangish brown and brown, locally

clayey, sand and gravel with a low cobble

content. Gravel is angular to rounded, fine

to coarse of flint, locally chalk and rare

quartzite

Chalk –

Structureless

Grade

Dc/Dm

5.6 to 5.7 19.03 to

18.90

Unproven at

13.55

Grade Dm material was described as off

white sandy silt with fine to coarse gravel

size very weak, low density chalk clasts and

rinded flint, whilst the Grade Dc was

described as being, ‘recovered as’ slightly

sandy, clayey, off white, very weak, low

density sub-angular to sub-rounded fine to

coarse gravel size fragments in an off white

to yellowish brown clay of chalk matrix.


2.7 Visual / Olfactory Evidence of Contamination

A summary of the significant visual / olfactory evidence of contamination within Jubilee Riverside

South is presented in Table 2.3.

Table 2.3- Summary of the Significant Visual & Olfactory Evidence of Contamination as part of the 2014 Ramboll and 2013 Provectus Ground Investigations

Exploratory Hole

Depth (mbgl)

Strata Description Potential Source

RBH11A 0.9 MG Possible asbestos containing materials.

Paper Recycling Activities

RTP03 0.3 to 1.0 MG Hydrocarbon odour Paper Recycling Activities

RTP05 1.0 to 2.0 MG Possible asbestos containing tile, clusters of brown fibres and a slight hydrocarbon odour.


RTP10 0.35 MG Possible asbestos containing tile. Paper Recycling Activities

RWS20 0.65 1.2

MG MG

Possible asbestos containing materials. Mild hydrocarbon odour.


2TP6 0.3 to 1.1 MG Hydrocarbon odour. Paper Recycling Activities

2TP7 0.25 to 1.7 MG Slight gasworks odour. Gasworks Notes

Italics indicated exploratory holes advanced historically by Provectus.

MG = Made Ground, ALV = Alluvium, RTD = River Terrace Deposits, UC = Upper Chalk

2.8 Hydrogeology

The Alluvial Deposits are classified by the Environment Agency as a Secondary A Aquifer while

the underlying River Terrace Deposits and Upper Chalk Formation are classified as Principal

Aquifers and are considered to be in hydraulic continuity due to the absence of a significant low

permeability layer separating the two strata. The majority of the site is situated in a Groundwater

Source Protection Zone I with Zones II and III located to the south of the site. It is understood

that the GSPZ designations relate to Thames Water Groundwater Abstractions to the north of the

site to the east of the Jubilee River. Several of these are understood to be disused and following

discussions with the Environment Agency are considered to be hydraulically up-gradient of the

site and not sensitive receptors.

During groundwater level monitoring water was identified within several of the stratum

underlying the site including the Made Ground, Alluvium, River Terrace Deposits and Upper

Chalk. From inspection of groundwater levels it is apparent that water is present as isolated

occurrences of perched water within the Made Ground between 23.44 and 23.52mAOD and as

the main groundwater body deeper within the Alluvium, River Terrace Deposits and shallow

Upper Chalk between 20.43 and 21.34 mAOD. Based on the observed groundwater levels a

general groundwater flow direction is assumed towards the south southwest.

2.9 Hydrology

The site is situated within a hydrologically sensitive area with the Jubilee River forming the

eastern boundary of the site with river levels found at an approximate elevation of +22.0mOD.

The River Thames is located approximately 85m west at its closest point and since 2003 the

highest recorded water level within the River Thames was recorded by the Environment Agency

at +22.87mOD. Both rivers flow in a north to south direction.

2.10 Ground Gas

A total of 6No ground gas monitoring visits had been undertaken on selected wells within the

area between 15th December 2014 and 13th March 2015. For the purposes of this assessment

the 2014/2015 has been supplemented with the results of 2No ground gas monitoring visits

undertaken by Provectus on 19th and 26th November 2013 which Berkeley Homes (Three

Valleys) Ltd have reliance on. Generally the monitoring visits were undertaken under periods of


high, moderate, low and falling atmospheric pressure. A summary of the ground gas data within

Jubilee Riverside South is contained below in Table 2.4.

Table 2.4 - Jubilee Riverside South Ground Gas Data

ID No of Visits

Atmospheric Pressure Range (mb)

Max Gas Flow (l/hr)

Max CH4 (%v/v)

Max CO2 (%v/v)

Minimum O2 (%v/v)

Max H2S (ppm)

Max CO (ppm)

VOC (ppm)

RWS19A 6 987 to 1031 0.0 0.2 9.9 0.1 0 0 0

RWS20 6 987 to 1031 0.0 3.4 3.9 0.0 0 0 0

RWS21 6 987 to 1031 0.0 0.4 6.1 0.0 0 0 0

RWS22 6 987 to 1031 0.0 4.8 6.5 0.0 0 0 0

RWS23 6 987 to 1031 0.0 0.2 6.7 9.6 0 0 0

RBH10 6 987 to 1031 0.0 0.2 3.9 14.4 0 0 0

BH201S 8 987 to 1042 0.0 0.5 5.6 0.0 0 0 0

BH201D 2 987 to 1042 0.1 0.2 6.5 0.3 0 0 0

WS201 7 988 to 1042 0.0 0.0 6.5 0.3 0 0 10

The site is classified as a Characteristic Situation of 2 due to elevated concentrations of carbon

dioxide and methane being consistently recorded in excess of the 5% v/v and 1% v/v thresholds

(respectively) indicated in CIRIA C665 (CIRIA, 2007). Consequently ground gas protection

measures are required in new structures. In addition the observed concentrations of carbon

dioxide are above workplace exposure limits for short and long term exposure. Concentrations of

hydrogen sulphide and carbon monoxide are below workplace exposure limits.

As part of the Ground Contamination Interpretative Report (Ramboll, 2015) an assessment of the

risks from volatile organic compounds (VOCs) was undertaken which concluded that there is an

absence of significant soil or groundwater borne sources of VOCs and in the context of the

concentrations identified during monitoring, the risks were considered to be negligible.

2.11 Ground Contamination

As part of the ground investigations referred to in Section 2.5 a number of contamination issues

were identified which are summarised below and within Figures 2.4 to 2.16. These are also

comprehensively discussed within the Ground Contamination Interpretative Report (Ramboll,

2015).

Soils

Human Health

Isolated exceedences of the arsenic GAC were recorded in 2TP4 at 0.9m and RTP03 at 0.7m

up to a maximum of 77.3mg/kg. In addition a single isolated exceedence of the nickel GAC

was recorded within 2TP4 at 0.5m with a concentration of 3,700mg/kg. Exceedences of the

lead GAC were also predominantly recorded as isolated hotspots with 8No samples exceeding

from 2TP4 at (0.5 and 0.9m), RBH11A (0.9m), RBH12 (0.6m), RTP03 (0.7m), RTP04 (0.9m),

RTP07 (0.8m) and RWS19A (0.5m) up to maximum of 2,300mg/kg. Statistical analysis

indicated potential impacts from lead and nickel (UCLs of 506 mg/kg and 646 mg/kg

respectively).

Individual PAH species exceedences of GAC were recorded in 4No isolated locations in RTP03

(0.3m and 0.7m), RTP05 (0.9m), RTP07 (0.8m) and RTP20 (0.9m) for naphthalene,

benzo(a)anthracene, benzo(b)flouranthene, benzo(a)pyrene, chrysene and

dibenzo(a,h)anthracene. Statistical analysis indicates potential impacts from

benzo(a)anthracene (UCL of 13.29mg/kg), benzo(b)flouranthene (UCL of 13.81mg/kg),

benzo(a)pyrene (UCL of 10.84 mg/kg) and dibenzo(a,h)anthracene (UCL of 1.10 mg/kg).


Petroleum hydrocarbon concentrations were recorded up to maximum of 6,000mg/kg within

the shallow soils (<1m). Concentrations elevated above laboratory detection limits were

recorded in several exploratory holes across the site with concentrations in excess of soil

saturation limits which are indicative of the presence of free phase hydrocarbons, however,

none were noted during the ground investigation works. While significantly elevated above

laboratory detection limits (LoD), it is important to note, however, that where speciated

analysis has been undertaken the observed concentrations do not generally exceed the

adopted GACs for speciated TPH for a residential end use. There is one exception within

RTP05 at 0.9m where a marginal exceedence of TPH Aromatic C16-C21 GAC (540 mg/kg) is

recorded with a concentration 560mg/kg. Statistical analysis indicates that site wide impacts

are not likely. Where concentrations in excess of LoD are recorded they are generally less

mobile heavier end hydrocarbons i.e.>C12 and are not accompanied by BTEX or volatile

organic compounds (VOCs or SVOCs).

Prevalent asbestos containing soils (ACM) within the shallow (<1m) Made Ground and to a

lesser extent within the deep (>1m) Made Ground across the area. Of the 35No soil samples

submitted for asbestos analysis, 17No returned a positive identification for Asbestos

Containing Material (ACM) in the form of chrysotile cement, bitumen and free fibres and

amosite insulation and fibres. Asbestos containing soils were widespread within the Area and

recorded within 2TP1 (0.6m), 2TP2 (0.5m), 2TP3 (0.8m), 2TP4 (0.9m), 2TP6 (0.7m), 2TP7

(0.6m), RBH10 (0.5m), RBH11A (0.9m), RBH12 (0.4m), RTP03 (0.3m and 0.7m), RTP04

(0.45m and 0.9m), RWS19A (0.5m), RWS20 (0.8m) and RWS22 (0.4m). Following the

positive identification of ACM, subsequent quantitative laboratory analysis was commissioned

on 9No positivity identified samples. The samples analysed reported ACM concentrations

between <0.001%w/w and 0.033%w/w. Subsequent dustiness testing indicated the potential

for fibre release at concentrations above background levels should soils be persistently

disturbed.

Phytotoxicity

Elevated concentrations of copper (1,880 mg/kg max), nickel (3,700mg/kg max) and zinc

(1,670 max) which could present a risk to future flora.

Water Supply Pipes

The aforementioned petroleum hydrocarbon concentrations which are in excess of thresholds

for PE water supply pipes in site soils.

In relation to soil impacts remedial measures are deemed necessary to mitigate impacts from

heavy metals, PAHs, phytotoxic contaminants, petroleum hydrocarbons in relation to water

supply pipes and asbestos containing materials with Made Ground.

Controlled Waters

Within soil leachate and groundwater no significant contamination sources have been identified,

however several marginal exceedences of GAC have been identified which are highlighted below

for transparency.

As part of soil leachate analysis concentrations of leachable lead (11 µg/l max) and mercury

(0.8 µg/l max) were identified in isolated locations.

Within groundwater marginally elevated concentrations of ammonium as NH4 were recorded

in RBH12 (760 µg/l max with GAC of 600 µg/l) along with marginal exceedences of the

mercury GAC within BH201S, BH201D, RBH11 and RBH12 (0.34 µg/l max with GAC of 0.05

µg/l). Due to isolated marginal nature of these exceedences they are not considered to be

representative of on-site sources of contamination.


Marginally elevated concentrations of petroleum hydrocarbons above GAC were recorded in

BH201S (River Terrace Deposits) and BH201D (Upper Chalk) as part of monitoring

programme by Provectus in 2013. Maximum concentrations were recorded up 14 µg/l

(BH201S) and 45 µg/l (BH201D). As part of monitoring undertaken as part of the most recent

ground investigation (2No visits on 5No wells) no petroleum hydrocarbon impacts to

groundwater have been identified with concentrations consistently below LoD (10 µg/l)

including testing on samples collected from BH201S and BH201D.

Chemical analysis of surface water samples collected at strategically selected locations

hydraulically up-gradient and down-gradient of the site did not identify any contaminants in

excess of GAC.

On the basis of the soil leachate, groundwater and surface water chemical analysis no specific

remedial measures are deemed necessary in relation to controlled waters risks. However, given

the sensitivity of the site in terms of Controlled Waters strict adherence to environmental controls

are deemed necessary.

Summary

Following the identification of the contamination highlighted above a conceptual site model was

prepared for the site as part of the Ground Contamination Interpretative Report which identified a

number of potentially significant pollutant linkages which are summarised in Table 2.5.

Table 2.5 - Potentially Significant Pollutant Linkages

Contamination Identified Associated Potentially Significant Pollutant Linkages

Risk

Human Health Impacts of lead and the PAHs benzo(a)pyrene, benzo(b)flouranthene benzo(a)anthracene and dibenzo(a,h)anthracene) within the shallow (<1m) site soils.

Direct Contact and ingestion and inhalation of soils and dusts associated with future site users.

Moderate to Moderate / Low

Human Health Prevalent asbestos containing soils within the shallow (<1m) Made Ground and to a lesser extent within the deep (>1m) Made Ground across the area. ACM in the form of chrysotile cement, bitumen and free fibres, amosite insulation and fibres and crocidolite free fibres.

Ingestion of asbestos fibres, primary inhalation of airborne asbestos fibres and secondary inhalation from trafficked soils containing asbestos fibres or ACMs associated with future site users.

High

Water Supply Pipes Elevated concentrations of petroleum hydrocarbons that may preclude the use of PE pipes.

Direct contact with water supply pipes and tainting of drinking water supplies.

Moderate

Phytotoxicity Elevated concentrations of copper, nickel and zinc which could present a risk to flora.

Root uptake associated with future flora at the site.

Moderate/Low

Ground Gas Elevated concentrations of carbon dioxide resulting in the area being classified as a Characteristic Situation of 2 (CS-2).

Migration and subsequent inhalation of gases / vapours and accumulation enclosed spaces leading to impacts to human health and property.

Moderate to Low

These pollutant linkages have the potential to adversely impact end users, flora water supply

pipes and property should mitigation/remedial measures not be incorporated within the enabling

works, construction works and operational stages. This Remediation Strategy has been prepared

to address these pollutant linkages.


3. REMEDIATION STRATEGY

Due to the development and construction programme the remedial strategy detailed within this

section will be required to be executed in two stages which broadly comprise:

Stage 1 – Site enabling works and the formation of a development platform to a minimum

level of +24.70mAOD beneath buildings and garden / soft landscaped areas and +24.85mOD

beneath roads.

Stage 2 – Construction works to deliver the final proposed development with a minimum

finished ground level of +25.20mOD and finished floor level of +25.35mOD.

Within each of these development stages a range of remedial activities will be required. Table 3.1

below provides a summary of the activities required in each stage which are described in detail in

the following section.

Table 3.1 - Required Remediation Measures

Remedial Action Stage 1 Stage 2

General Site Operations

General Site Environmental Controls

Unforeseen Contamination Protocol

Baseline & Long Term Water Monitoring

Borehole Decommissioning

Material Re-Use Strategy

Material Importation Strategy

Waste Management Strategy

Groundwater Management

Specific Stage 1 Remedial Works

Site Clearance and Underground Structures X

Asbestos Management Procedures X

Clean Service Corridor Construction X

Specific Stage 2 Remedial Works

Clean Capping X

Foundation Works Risk Assessment X

Ground Gas Protection Measures X

The remediation strategy described in the following sections is described in relation to these

development stages.

3.1 General Site Environmental Controls

The following Section provides an outline of the expectations of the Contractor to ensure

environmental compliance throughout the duration of enabling and remedial works. It is assumed

that demolition works are to be undertaken separately but the demolition contractor should

adhere to the general guidance provided as part of this strategy and should undertake works in

an environmental sound manner in accordance with industry best practice.

3.1.1 Air Quality and Dust

The Contractor shall be responsible for obtaining any necessary authorisations required by the

Local Authority including liaison for any monitoring requirements to be adopted.

The Contractor shall be responsible for the implementation of any air quality and dust monitoring

required by the Local Authority.


The Contractor shall ensure that emissions to air are minimised and that all necessary

precautions to prevent the occurrence of smoke emissions, fumes or odours from site plant,

stored fuel or other substances and prevent any emissions for fumes drifting into the nearby

residences, workplaces or public open spaces.

A log of the activities being undertaken on the site to the Project Employer's Representative each

week together with a record of any complaints that have been received.

It will be necessary to ensure that mitigation measures are implemented to prevent off-site

migration of contaminants as dust/vapours or run-off during excavations and soil stockpiling.

It will be necessary to ensure that all plant is in good repair and conforms to the manufacturers

or legislative/British Standard emission standards. Plant shall not be left running for long periods

when not directly in use. Where appropriate or practical, electrically powered plant shall be used

instead of diesel.

Taking into consideration the positive identification of ACM within the underlying Made Ground,

adequate site-wide health and safety protocols (PPE/RPE) and dust suppression techniques are

considered integral to pollution prevention and methodologies and procedures should be selected

through consultations with a specialist asbestos contractor in accordance with best practice and

legislation current at the time of the works, plus any specific requirements of Local Authority and

the Health and Safety Executive. It is emphasised that ACM in widespread and specialist advice

should be sought from a specialist asbestos consultant/contractor.

Dust suppression techniques and monitoring requirements should be outlined in consultation with

a specialist asbestos Contractor. Suppression techniques and monitoring requirements are likely

to include (but not exclusive to) soil dampening with the use of a dedicate site water bowser, use

of dust curtains and air quality monitoring stations along site boundaries.

The following measures shall be used by to minimise the generation of dust where appropriate:

Wheel washing and street sweeping (where appropriate);

Loading/unloading within designated bays/areas;

Hoarding around site and/or appropriate locations such as plant;

Monaflex or similar sheeting around scaffolding;

Sheeting of lorries leaving site;

Maintenance of plant;

Liaison with neighbours; and

Highest standards of housekeeping.

No vehicles shall leave the site with earth, mud, etc. adhering to the wheels in a quantity which

may result in its being deposited on the public highway or footpath, and creating a nuisance, or

hazard to vehicles or pedestrians. Suitable wheel washing equipment to avoid such problems

shall be installed, operated and maintained on the site until the development is completed.

The written consent of the Environment Agency and Local Utility provider shall be obtained

regarding the disposal of wheel wash water to surface water drains.

3.1.2 Noise and Vibration

The Contractor shall be responsible for obtaining any necessary authorisations required by the

Local Authority including liaison for any monitoring requirements to be adopted. Any ‘Out of

hours’ work shall require prior agreement with South Bucks District Council.


The Contractor shall be responsible for the implementation of any noise and vibration monitoring

required by the Local Authority.

The Contractor shall take all practical measures to minimise noise and vibration during the Works

and where relevant, comply with BS 5228 Noise Control on Construction and Open Sites.

The following measures should be implemented to minimise the generation of noise and

vibration:

Use of acoustic silencers on equipment;

Regular maintenance of plant;

Unloading and loading of material within designated areas;

Radio controlled lorry movements to avoid unnecessary vehicles on site; and,

Liaison with neighbours in conjunction with the employer’s agent.

3.1.3 Oils, Fuels and Chemicals

Oils, fuel and chemical storage facilities should be designed with regard to EA Pollution

Prevention Guidelines (PPG). Best practices with regard to controlling pollution and spillages

include (but are not limited to) the following:

designated facilities specially designed for the storage of fuels and oils in accordance with

PPG2;

an oil, chemical and product inventory for the site;

site drainage plans;

emergency procedures;

use of drip trays beneath stationary plant;

keeping plant well maintained;

site induction for all personnel on emergency procedures;

contact list of emergency services, water suppliers, EA, LA & HSE; and,

emergency response equipment (provision of adequate spill kits on-site and competent

emergency response staff).

Bunded areas should comprise at least 110% of the total storage capacity. For smaller storage

volumes, the volume of the largest container should be catered for.

The storage, itinerary, and use of hazardous materials on-site will be conducted in accordance

with the Control of Substances Hazardous to Health (COSHH) regulation 2002. In accordance

with COSHH, records held of all hazardous materials on-site will be maintained by the Contractor.

The Contractor is responsible for the completeness and accuracy of all records held.

3.1.4 Unforeseen Contamination Protocol

The Contractor shall be required to provide a method statement relating to any unexpected areas

of contamination encountered during the earthworks.

Potentially contaminated materials are those which via visual or olfactory evidence may be

suspected to be contaminated (i.e. the presence of staining, odours or deleterious materials).

The unforeseen contamination protocol is likely to include:

The Contractor stopping work in that area and immediately inform Berkeley Homes

(Three Valleys) Ltd or their representative and Ramboll to discuss the proposed action;

The Contractor liaising with the statutory authorities including the EA and South Bucks

District Council to agree proposals for dealing with this material;


The implementation of measures to remove contaminated materials (where feasible) for

segregation, storage or stockpiling (of soils) within a bunded and polythene covered area

whilst testing is undertaken. Contaminated liquids should be stored in suitable containers;

A record should be made of the volume of material removed and the extent of any

required excavation;

The full extent of the contaminated material must be excavated (minimum 0.5m overdig)

and furthermore validated by a suitably qualified engineer;

Undertake laboratory testing of representative samples from the base and sides of the

excavation (minimum of 1 sample per 10m length of sides and 1 per 100m2 base) and

testing of the material for a suitable suite of contaminants. The suite and chemical criteria

for verification are to be defined in consultation with Ramboll and the regulatory

authorises based on the nature of the contamination encountered;

If the material fails comparison against the re-use thresholds this material should be

excluded from the re-use strategy and alternative scenarios should be sought for re-use.

The last option should be disposal of off-site in accordance with current waste regulations.

Records including laboratory analytical certificates, waste transfer notes, consignment

notes and volumes requiring removal should be retained by the Contractor; and

If the material passes comparison with re-use thresholds (and is geo-technically suitable),

the contactor should determine and record the location for placement of the material.

It will be necessary to retain all records relating to testing, quantity, depth and location of the

material identified. Where such material is re-used, it will be necessary to demonstrate suitability

through appropriate chemical testing and to retain records on where this material was placed.

If this material is removed off-site, then in addition to records on the source area outlined above,

it will also be necessary to retain duty of care records relating to waste transfer notes, quantities

and the receiving site.

3.1.5 Surface Water Management

The Contractor will be responsible for the preparation and implementation of a site-specific

Surface Water Management Plan.

The management plan must identify all potential risks posed to controlled waters during the

works and the mitigation measures to be adopted on-site.

Water accumulated at the surface must be prohibited from entering directly into the adjacent

surface water bodies.

The Contractor shall ensure that any discharges are only made with the appropriate discharge

consents. It is the Contractor’s responsibility to obtain the required discharge consents from the

Environment Agency and or local water authority including any Flood Defence Consent for works

within 8m of the Jubilee River.

The Contractor shall ensure regular inspection of all discharge points and associated pipe work,

drainage systems, collection ditches, lagoons, oil separator (and drip-trays) and watercourses to

check that these are in good order. Observations will be reported within weekly site inspection

records.


The Contractor shall comply with BS 6031:1981, Code of Practice regarding the general control of

site drainage.

The surface water management plan shall also provide details of the contractor’s emergency

preparedness such as the provision of floating booms for use in the Jubilee River should a

pollution event occur to ensure that any floating hydrocarbons are constrained for removal with

absorbent materials.

3.1.6 Baseline & Long Term Water Monitoring

As enabling and construction works have the potential to mobilise contaminants to surface water

(Jubilee River) and groundwater within the Alluvium Secondary A and River Terrace

Deposits/Upper Chalk Principal Aquifers monitoring and sampling will be required during the

course of the works. Monitoring and sampling shall be undertaken prior to works commencing on

site, at one monthly intervals during and upon completion of ground disturbance activities e.g.

earthworks and piling.

The remediation and groundwork’s contractors will be responsible for undertaking monitoring

during their stage of operations i.e. the remediation contractor is responsible for monitoring in

advance of the works and during remediation and the bulk excavations (Stage 1) and the

groundwork’s contractor is responsible for monitoring during piling works and upon completion of

penetrative activities (Stage 2).

The sampling locations are highlighted below in Table 3.2 and shown on Figure 3.1.

Table 3.2 - Long Term Monitoring Locations

Location 50mm Slotted Standpipe and Response Zone (m)

Response Zone Strata

River Terrace Deposits

RBH10 2.5 to 6.0 River Terrace Deposits

RWS19A 1.8 to 6.0 Alluvium & River Terrace Deposits

BH202S 1.0 to 8.0 River Terrace Deposits

BH203 1.0 to 6.0 River Terrace Deposits

BH205 1.0 to 6.0 River Terrace Deposits

Upper Chalk Deposits

RBH11A 6.0 to 11.0 Upper Chalk

RBH12 10.0 to 15.0 Upper Chalk

Surface Water Samples

JBRS/SW01 - Jubilee River

JBRS/SW02 - Jubilee River

Should these wells not be in serviceable condition or in the event that the contractor cannot

locate the wells or damages them during the course of works it will be contractor’s responsibility

to replace them with suitable installations at spatial intervals agreed with Ramboll.

Water samples shall be collected in accordance with relevant British Standards i.e. BS ISO 5567-

11 and BS ISO 6068-6.11 (British Standards Institute, 2009) and subject to analysis for the

determinands and contaminant thresholds detailed within Table A2.1 within Appendix 2.

Should contaminants be identified in groundwater or surface water in excess of the thresholds

detailed in Table A2.1 within Appendix 2 the contractor will follow the Unforeseen Contamination

Protocol outlined in Section 3.1.4.

3.1.7 Borehole Decommissioning

Aside from the wells that are required for long term monitoring as outlined above, prior to

undertaking any remedial works any monitoring wells installed within the Alluvium, River Terrace


Deposits and Upper Chalk Formation are required to be decommissioned in general accordance

with the Environment Agency Document ‘Good Practice on Decommissioning Redundant

Boreholes and Wells’.

Wells not required for long term monitoring will be decommissioned during Stage 1 by the

Remediation Contractor.

Wells that were required for long term monitoring will be decommissioned upon completion of

penetrative activities during Stage 2 by the Groundwork’s Contractor.

All decommissioned boreholes must be effectively grout sealed over its full length.

The Remediation and Groundwork’s Contractors shall agree the Method Statement of the Works

with the Environment Agency prior to works starting.

A summary of wells installed within Jubilee Riverside South is provided below in Table 3.3 and

Figure 3.2.

Table 3.3 - Summary of installed monitoring wells

Hole ID 50mm Slotted Standpipe and Response Zone (m)

19mm Piezometer Tip Depth (m)

19mm Piezometer Tip Depth (m)

Response Zone Strata for 50mm Standpipe / 19mm Piezometer

RBH10 2.5 to 6.0 18.0 - River Terrace Deposits / Upper Chalk

RBH11A 6.0 to 11.0 - - Upper Chalk

RBH12 10.0 to 15.0 - - Upper Chalk

RWS19A 1.8 to 6.0 - - Alluvium & River Terrace Deposits

RWS20 0.5 to 1.5 - - Made Ground

RWS21 1.5 to 6.0 - - River Terrace Deposits

RWS22 0.5 to 1.5 - - Made Ground

RWS23 1.0 to 2.5 - - Made Ground & Alluvium

BH201 1.0 to 7.0 15.0 to 20.0 - River Terrace Deposits / Upper Chalk

BH202 1.0 to 8.0 15.0 to 20.0 30.0 to 42.5 River Terrace Deposits / Upper Chalk / Upper Chalk

BH203 1.0 to 6.0 - - River Terrace Deposits



WS201 1.0 to 4.0 - - River Terrace Deposits

WS203 1.0 to 4.0 - - Alluvium & River Terrace Deposits

WS204 1.0 to 4.0 - - Made Ground, Alluvium & River Terrace Deposits

The Remediation and Groundwork’s Contractors shall submit all details to Ramboll relating to the

decommissioning works for inclusion in the Verification Report.

3.1.8 Material Re-use

It is recommended that the re-use of any site-won material be undertaken using the CL:AIRE

Definition of Waste Industry Code of Practice (CL:AIRE, 2012).

In brief, under the Code of Practice, it will be necessary to ensure:

The use of this material is protective of human health and the environment;

Materials are suitable for use (either with or without treatment);

There is certainty materials will be used; and

Only the required quantity is used.


The excavation, movement, tracking and placement of materials at the site should be undertaken

in accordance with a Materials Management Plan (MMP) for the site under the CL:AIRE Code of

Practice v2 (CL:AIRE, 2012) to be produced by the Contractor and signed-off by a Qualified

Person.

The MMP ensures that material excavation is correctly recorded, materials are tested against

relevant criteria (chemically and geotechnically) prior to placement in suitable locations. The MMP

details the tracking system used and relevant records to be kept in order that verification of

material movements can be undertaken at a later date.

Opportunities for the Jubilee Riverside site to become a receiver site for suitable materials from

other sites under the terms of the CL:AIRE Code of Practice v2 (CL:AIRE, 2012) should be sought

by the Contractor. Similarly, opportunities for the recovery of recycled aggregate should be

sought by the Contractor under the WRAP Protocol.

The Contractor is responsible for ensuring the suitability of materials placed as fill or within

private gardens or communal soft landscaped areas and ensuring appropriate testing is

undertaken. Any materials re-used within the clean capping system are required to be subject to

certification and analysis against the testing suites and frequencies detailed within Tables A3.1 of

Appendix 3 and Table A4.1 of Appendix 4, depending on end-use.

Material re-used within service corridors are required to be subject to certification and analysis

against the testing suites and frequencies detailed within Table A5.1 of Appendix 5.

Aside from the clean capping system and service corridor re-use thresholds (and any

geotechnical criteria) there are no further chemical suitably criteria.

3.1.9 Material Import

In addition to any geotechnical specification, all materials and imported aggregates used beneath

buildings, under hardstanding and within the construction of private gardens or communal soft

landscaped areas should be sourced from a reputable supplier and require certification to

determine the materials suitability for use on site prior to importation. Separate certification is

required for each type of material utilised.

All imported materials will need to be accompanied with chemical certification to demonstrate its

suitability for use on-site.

Any imported materials for use in private gardens and communal soft landscaped areas shall

comply with British Standard for Topsoil (British Standards Institute, 2007) and the chemical

criteria detailed in Section 3.4.1 and Table A3.1 of Appendix 3 and Table A4.1 of Appendix 4,

depending on the end-use. The imported soil will be free from asbestos, metals, plastics, wood,

glass, tarmac, paper and odours associated with contaminated soils.

Any imported materials for use within service corridors are required to be subject to certification

and analysis against the testing suites and frequencies detailed within Section 3.2.3 and Table

A5.1 of Appendix 5. The imported soil will be free from asbestos, metals, plastics, wood, glass,

tarmac, paper and odours associated with contaminated soils.

Imported aggregate for uses such as temporary surfacing to haul roads or set-up areas or piling

mat etc. will need to adhere to the same site controls as outlined above (with the exception of

virgin quarried materials). Where recycled aggregates are sourced the producer of the aggregate

must show the material has been fully recovered and is no longer a waste. To do this the

producer must follow the quality protocol for the production of aggregate from inert waste, as

outlined by WRAP.


The Contractor will be responsible for retaining accurate records of all imported material in

accordance with the requirement Verification Plan outlined in Section 4.

3.1.10 Waste Disposal

Waste Regulation and Classification

It is understood that during the works there may be the requirement to remove surplus material

from site. All waste for off-site disposal is subject to the Waste Framework Directive.

Any materials that are considered to be waste will need to be managed in accordance with the

Environmental Permitting Regulations.

Soils that are surplus to requirements must be removed off-site to an appropriately licensed

facility under the Duty of Care Regulations by an appropriately licensed waste carrier.

A preliminary waste assessment was undertaken by Ramboll as part of the Ground Contamination

Interpretative Report (Ramboll, 2015). As part of this assessment indicative percentage waste

stream splits were provided based on the proportion of samples indicated be hazardous as part of

the Hazwaste assessment and/or asbestos analysis. These are summarised below:

Made Ground – 50% Hazardous / Non Hazardous and 50% Inert;

Alluvium – 100% Inert;

River Terrace Deposits - 10% Hazardous / Non Hazardous and 90% Inert; and

Upper Chalk – 100% Inert.

The areas of hazardous / non-hazardous soils are spread throughout the Area and are

predominantly correlated to the presence of asbestos containing materials but also heavy metals,

PAHs and TPH in isolated locations within the Made Ground.

It should be acknowledged that the ratios stated above are indicative only, and based on a

statistical interpretation of the HazwasteOnline assessment and asbestos analysis results alone.

As such, the classification of materials excavated on-site as part of any future earthworks may

not necessarily reflect the likely waste streams.

It will be necessary to fully determine the waste classification of this material prior to removal

from site which is likely to involve Waste Acceptance Criteria (WAC) testing. This should be

undertaken by the Contractor.

Pre-treatment of waste prior to disposal is a legal requirement. The requirements for pre-

treatment should also be discussed with landfill operators as it is possible that sorting can in

some cases fulfil this requirement.

In order to remove hazardous material from the site for disposal to landfill, it will be necessary to

register the site with the Environment Agency as a producer of hazardous waste. It will also be

necessary to adopt the requirements of the duty of care regulations, transporting waste materials

using an approved waste carrier and waste transfer notes.

General Requirements

All general waste shall be stored in appropriate containers, for example compactors, covered

skips, wheelie bins, drums, etc, in designated waste storage areas within the hoarded site area.

All containers must be clearly labelled.


As a minimum, the following materials should be segregated and collected for recycling, where

suitable, if an appropriate re-use on site is not available:

Metal;

Hardcore, Aggregate, Broken Bricks;

Glass;

Plastic;

Timber;

Plasterboard.

The following documentation must be completed and held on site in a designated file for the

removal of waste:

Waste Transfer Notes (Controlled Waste) including EWC classification,

Consignment Notes (Hazardous Waste).

The Transfer Note must include a description and the quantity of the waste and details of the

waste collection contractor who must be licensed. Copies of the waste carriers registrations shall

be held on site. Sufficient information shall be provided to ensure that the waste disposal

operator is aware of the potential hazards of the substance. All documentation shall be retained

for a minimum of 2 years and be available for inspection.

Any hazardous wastes identified during the Works shall be removed by a specialist contractor and

appropriate measures made for its disposal in accordance with environmental legislation.

The removal of notifiable asbestos shall be carried out only by appropriately licensed and

experienced specialist contractors, and should occur under fully controlled conditions, in

accordance with legislation current at the time of the Works, plus any specific requirements of

Ramboll UK, South Bucks District Council and the Health and Safety Executive.

Any material destined for landfill disposal shall comply with all of the requirements in the Landfill

Directive, including appropriate Waste Acceptance Criteria testing of the subject material where

necessary.

3.1.11 Groundwater in Excavations

Groundwater has been encountered within several of the strata underlying the site including the

Made Ground, Alluvium, River Terrace Deposits and Upper Chalk. Perched water is present as

isolated occurrences/lenses within the Made Ground between 23.44 and 23.52mAOD with the

main groundwater body deeper within the Alluvium, River Terrace Deposits and shallow Upper

Chalk between 20.43 and 21.34 mAOD.

Whilst it is unlikely that earthworks will encounter the main groundwater body there is the

potential for perched waters to enter excavations which will require management.

Where perched waters are encountered during excavation works these are likely to require

purging.

In the event that groundwater is encountered during earthworks it may be necessary to obtain a

licence from the Environment Agency to undertake any de-watering activities should quantities of

water removed be greater than 20m3 per day.

Should either groundwater or perched water be identified as contaminated from visual/olfactory

assessment, waters should be stored in a controlled manner for subsequent testing and

characterisation prior to disposal in accordance with chemical criteria detailed in Table A2.1 of

Appendix 2.


Should disposal to surface water or public sewer be deemed appropriate the contractor will be

responsible for any pre-treatment, additional sampling and monitoring. Any specific testing

requirements will need to be agreed with the receiving site, the Environment Agency for

discharges to surface water, or if to public sewer, with the local authority & water authority, prior

to any disposal / discharge taking place.

3.2 Specific Stage 1 Remedial Works

The Stage 1 remedial works involve site clearance, grubbing out of below ground structures and

earthworks to enable the formation of a development platform at a minimum level of

+24.70mAOD beneath buildings and garden / soft landscaped areas and +24.85mOD beneath

roads.

The contractor should consider the requirement for undertaking the Stage 1 works in 2 phases in

accordance with the Berkeley Homes Build Strategy Overlay Plan ref O.406.017B due to

environmental programme constraints associated with the demolition (by others) of the

warehouse structures in the south of the site.

3.2.1 Site Clearance and Underground Structures

Considering the age of the buildings at the site which are scheduled for demolition there is the

potential that asbestos containing materials are present within their construction. Prior to

demolition demolition/refurbishment surveys are required to be undertaken in affected buildings

so appropriate management plans and procedures can be put in place. While demolition is not

considered part of the remediation works. Notwithstanding this the demolition contractor should

adhere to the requirements of this strategy.

As part of site clearance the contractor will be responsible for the removal of vegetation

(including any invasive species) and the fly-tipped material stockpiles at the margins of the site.

Due to the historical industrial nature of the site there is the potential that the enabling works will

encounter subsurface structures, underground bulk storage tanks, foundations, ductwork,

interceptors, sumps and pipework etc. These structures have the potential to contain potentially

contaminative solids and liquids and where encountered they should be assessed by competent

persons prior to their penetration and removal. Should contaminative materials be present the

structures should be dealt with in accordance with the unforeseen contamination protocol

described in Section 3.1.4.

Any encountered structures should be removed with excavations over-dug by a minimum to

500mm to ensure the area is clear.

Should bulk storage tanks, sumps and interceptors etc. be encountered they should be emptied

of their contents, chased and sealed at the site boundary and removed from site under an

appropriate duty of care by qualified contractors / persons. Through removal principal and

residual sources of contamination would be removed.

Through removal of any remaining underground structures and any associated impacted soils it is

considered that any residual sources of contamination would be removed.

The contractor should give consideration to the re-use of processed site won concrete from relic

foundations and slabs under the quality protocol for the production of aggregate from inert waste

as outlined by WRAP. The contractor will be responsible for demonstrating that re-used materials

are compliant with the criteria outlined in Section 3.1.8.


3.2.2 Asbestos Management Procedures

Asbestos containing materials have been identified within the site soils in the form of chrysotile

cement, bitumen and free fibres, amosite insulation and fibres and crocidolite free fibres with

concentrations ranging from <0.001%w/w and 0.033%w/w.

The contractor (in conjunction with specialist advice) should produce detailed method statements

and a management plan for the works based on the principals of material management and

retaining asbestos impacted soils on site where suitable for use with a view to minimising the

volume of impacted soils being disposed of from site. The contractors detailed method

statements should incorporate but not be limited to the following:

All works associated with asbestos containing materials will be undertaken by

appropriately trained operatives;

The removal of notifiable asbestos shall be carried out only by appropriately licensed and

experienced specialist contractors, and should occur under fully controlled conditions, in

accordance with legislation current at the time of the Works, plus any specific

requirements of Local Authority and the Health and Safety Executive;

All non-notifiable asbestos disturbing operations should be undertaken under semi-

controlled conditions with suitable dust suppression systems in place and using

appropriate PPE and RPE and decontamination systems;

Consideration should be given to reducing the asbestos content of soils through non-

destructive methods such as hand picking where identifiable fragments are present.

Reassurance monitoring should be undertaken during all asbestos disturbing activities

with reference to guidance and exposure limits published by the Health and Safety

Executive and the Control of Asbestos Regulations, 2013.

Should significant concentrations of asbestos containing materials be encountered

consideration should be given to works being undertaken in isolated areas under fully

controlled conditions with reassurance clearance testing undertaken following removal;

Personal human health monitoring should be undertaken on operatives involved in

asbestos related activities; and

Should boundary monitoring detect fibres, all activities associated with the impacted site

soils should be ceased until the source of fibres is detected and mitigation measures are

implemented.

The contractor will be responsible for notifying the Health and Safety Executive and obtaining

relevant licenses to undertake the works.

All works should be undertaken in accordance with legislation current at the time of works

including any requirements of the South Bucks District Council and the Health and Safety

Executive including those of the Control of Asbestos Regulations, 2013.

3.2.3 Service Corridors

As part of the Ground Contamination Interpretative Report (Ramboll, 2015) elevated

concentrations of petroleum hydrocarbons were identified that are likely to preclude the use of PE

pipes. In addition potentially unacceptable risks to human health (construction workers and

maintenance workers) were also identified associated with the presence of asbestos containing

soils within the Made Ground (chrysotile cement, bitumen and free fibres, amosite insulation and

fibres and crocidolite free fibres) with concentrations ranging from <0.001%w/w and

0.033%w/w.

Consequently, a series of clean service corridors are required to be installed with a finished

development ground level of a minimum of +24.85mOD with the base of the corridor at

approximately +23.0mOD. The service corridors should be excavated and a marker layer (teram

or similar) placed at the base and sides of the trench before backfilling with material that meets

the chemical criteria detailed in Table A5.1 of Appendix 5. Consideration should be given to the


re-use of site won materials through over digging of corridors into natural ground materials

providing that the chemical criteria are satisfied. Materials used for service trench infill should be

analysed for the determinands detailed in Table A5.1 of Appendix 5 at a rate of 1 per 500m3.

This frequency should be confirmed with Ramboll prior to reuse/import of materials based on site

specific conditions.

3.3 Site Conditon Requirements upon Completion of Stage 1 Remedial Works

Upon completion of Stage 1 it is required that the remedial works and material management

procedures provide a development platform at a minimum level of +24.70mAOD beneath

buildings and garden / communal soft landscaped areas and +24.85mOD beneath roads to allow

for piling and construction to commence. Compliance with these levels is required to be

demonstrated through provision of as-built surveyed drawings.

It is required that all in ground contamination risks are remediated during Stage 1 and all

underground structures so that pending completion of the specific remedial works required in

Stage 2 outlined below, the site would be considered suitable for use. In particular upon

completion of Stage 1 there should not be any residual in-ground contamination risks remaining

to construction workers during Stage 2 or future maintenance workers. The contractor will be

required to certify/provide warranties to that effect.

3.4 Specific Stage 2 Remedial Works

3.4.1 Capping System

Based on the localised elevated concentrations of lead, nickel and PAHs above GACs and the

prevalent occurrence of asbestos (chrysotile cement, bitumen and free fibres, amosite insulation

and fibres and crocidolite free fibres) within the Made Ground, remedial measures for private

gardens and soft landscaped areas at ground level are required to protect end users.

Private Gardens

Within private gardens a clean cap of 850mm is required which will incorporate a hard “no dig”

demarcation layer of a minimum of 250mm thick to separate the clean cap from the residual

Made Ground.

Communal Soft Landscaped Areas

Within communal soft landscaped areas a clean cap of 500mm is required which will incorporate

a hard “no dig” demarcation layer of a minimum of 100mm thick to separate the clean cap from

the residual Made Ground.

General

Prior to the placement of the capping system, the underlying Made Ground should be compacted

to provide an appropriately flat/level formation to inhibit root penetration, burrowing and

instability.

Any materials (whether site won or imported) used within the clean cap construction of private

gardens or communal soft landscaped areas (including that for the cover system) shall be

analysed chemically and geotechnically to ensure it is suitable for use. This should be

undertaken prior to reusing/bringing any such material onto the site.

In private gardens and communal soft landscaped areas materials should be verified for chemical

suitability according to the following sampling frequency:


Topsoil – 1 sample per 100m3

Subsoil – 1 sample per 250m3

Furthermore the suitability of materials used will be subject to onsite verification of chemical

suitability at a rate of 1 sample per 5 gardens and 1 sample per communal soft

landscaped area.

All materials for use in private gardens and communal soft landscaped areas shall conform to the

contaminant thresholds detailed in Table A3.1 in Appendix 3 or Table A4.1 of Appendix 4,

depending on end-use. All chemical testing shall be undertaken at an appropriately accredited

laboratory (UKAS and MCERTs).

Verification of the thickness of clean capping installed is required at a rate of 1 inspection per 5

gardens and 1 inspection per soft landscaped area and the contactor shall maintain

documentation to demonstrate that this has undertaken successfully e.g. daily records and

photographic evidence for each area of soft landscaping clearly identifying the installed depth.

Note. These frequencies should be confirmed with Ramboll prior to reuse/import of materials

based on site specific conditions.

Documentation on the source, quantity and testing results shall be retained onsite for inspection

and subsequent inclusion in the verification report. The Contractor shall retain records on the

location, depth of excavations and how/where any imported material is placed.

3.4.2 Foundation Works Risk Assessment

Where foundation works penetrate into the Principal Aquifers of the River Terrace Deposits and

Upper Chalk a foundation works risk assessment will be required to be submitted to the

Environment Agency prior to works commencing. The foundation works risk assessment should

be prepared with reference to the Environment Agency’s document ‘Piling and penetrative ground

improvement methods on land affected by contamination: Guidance on pollution prevention’ ref.

NC/99/73.

3.4.3 Ground Gas Protection Measures

A total of 6No ground gas monitoring visits have been undertaken on selected wells within the

area between 15th December 2014 and 13th March 2015. As part of monitoring the site was

classified as a Characteristic Situation 2 / NHBC Amber 1 due to elevated concentrations of

carbon dioxide and methane being consistently recorded in excess of the 5% v/v (9.9% v/v max)

and 1% v/v (4.8% v/v max) thresholds (respectively) indicated in CIRIA C665 (CIRIA, 2007).

As a result ground gas protection measures providing 3 points of protection in accordance with

BS8485 (British Standards Institute, 2007)are required. These points could be achieved through

the following:

Passive sub floor ventilation with a venting layer constructed of no fines gravel, geo-

composites, polystyrene void formers etc. (1 to 1.5 points – performance related);

Reinforced concrete cast in-situ suspended OR ground bearing slab with minimal service

penetrations and taped and sealed penetrations at joints (1.5 points); and

Proprietary gas resistant membrane installed to reasonable levels of workmanship in line with

current good practice under independent inspection (CQA) in accordance with CIRIA (CIRIA,

2014) (1 point).


In addition the observed concentrations of carbon dioxide are above workplace exposure limits

for short and long term exposure. Consequently the contractor is required to employ suitable

mitigation measures during works in the event that temporary enclosed spaces are created e.g.

confined spaces entry systems and potential use of personal alarms.

3.5 Site Conditon Requirements upon Completion of Stage 2 Remedial Works

Upon completion of the Stage 2 Remedial Works the site should be considered suitable for use for

a residential development with private gardens and risks to end users from impacted Made

Ground and ground gas should be adequately mitigated.


4. VERIFICATION PLAN

4.1 Environmental Watching Briefs

It is recommended that a part-time environmental watching brief is undertaken by Ramboll

throughout groundworks and remediation at the site to verify the implementation of the remedial

strategy e.g. installation of ground gas protection, ensuring that service corridors and clean

capping are of an appropriate thickness and chemical suitability etc. and to provide guidance in

the event that unexpected or gross contamination is encountered.

Where Ramboll is not in attendance on site, it is expected that the Contractor be vigilant and

undertake verification works in accordance with this Remediation Strategy.

4.2 Verification Plan

It is likely that any planning approval will require the production of a verification plan providing

details of the data that will be collected in order to demonstrate that the works set out within this

Remediation Strategy are complete and to identify any requirements for longer-term monitoring

of pollutant linkages, maintenance and arrangements for contingency action.

In order to meet these requirements, the Contractor shall be required to obtain all necessary

information for Ramboll to complete a Verification Report, including (but not limited) to the

following:

Records of the implementation of clean capping including demonstration of the chemical

compliance, thickness placed and the presence of the “no-dig” hard demarcation layer

(including photographs);

Records of the implementation of clean service corridors including demonstration of the

chemical compliance and the presence of the membrane (including photographs);

Quantities of material imported to site;

Chemical testing results and information on any re-used materials and plans showing where

this material has been used;

Chemical testing results and information on the source of any imported material and plans

showing where this material has been used;

Plan showing location of any additional samples obtained for testing along with any

delineation of materials and quantities;

Results of any additional chemical and WAC testing undertaken along with method of sample

collection and transportation to laboratory, laboratory quality assurance and accreditation;

Quantities of any material disposed off-site as waste classification and details of the receiving

site/s and copies of all Waste Transfer Notes;

Records of the borehole decommissioning works (including photographs);

Records of the baseline and long term water monitoring programme (during an upon

completion of penetrative activities) and compliance with the required standards;

Records of the asbestos management measures employed;

Records of the ground gas protection measures installed at the site (including inspection

records and photographs) and independent verification in accordance with CIRIA C735;

Details of any areas of unexpected contamination and the actions undertaken;

Details of any water removed from excavations and disposed off-site, including chemical

testing;

Details and demonstration of any relevant permits or exemptions required by the

Environment Agency for re-using material or importing material, particularly where there is

the potential for material being considered waste;

Details on any protection measures installed for contamination and monitoring (if applicable)

of such measures – in particular records will be required to confirm whether protection

measures were required for contaminants present in excavations or water supply pipes; and

Details of regular (monthly) dialogue and any additional liaison and agreements with

Regulators.


On completion, the report should be submitted to the Local Planning Authority for approval. A

copy of the Verification Report will need to be retained on-site within the health and safety file. It

is of note that a Verification Report is also a requirement of the CL:AIRE Code of Practice.

It is recommended that periodic site audits are conducted by Ramboll to ensure adequate site

records and documentation is being maintained throughout the construction works. The purpose

of which will be to monitor whether sufficient data collection is being collected for the purposes of

completing the site Verification Report.


REFERENCES

British Standards Institute. (2007). Code of Practice for the Characterization and Remediation

from Ground Gas in Affected Developments ref BS8485:2007.

British Standards Institute. (2007). Specification for Topsoil and Requirements for Use ref

BS3882:2007.

British Standards Institute. (2009). BS ISO 5667-11:2009 and BS 6068-6.11:2009. Water

Quality - Sampling. Part 11: Guidance on Sampling of Groundwaters.

CIRIA. (2007). CIRIA C665. Assessing Risks Posed by Hazardous Ground Gases to Buildings.

CIRIA. (2014). Good Practice on the testing and verification of protection systems for buildings

againts hazardous ground gases ref CIRIA C735.

CL:AIRE. (2012). The Definition of Waste Industry Code of Praction Version 2.

Ramboll. (2015). Geoenvironmental and Geotehnical Desk Study. Ref 61033137.E.DSA.I03.

Ramboll. (2015). Ground Contamination Interpretative Report ref 61033137.E.GCIR.I01.


APPENDIX 1

FIGURES/DRAWINGS

60 Newman Street,

London, W1T3DA

[email protected]

T: 020 7462 5332

Project:

Mill Lane, Taplow - 61033137

Status: Information

Date:

19/03/14

Title:

Site Location Plan

Scale: NTS Drawn: TS Checked: ND

Figure 1

Rev: I00

Site Location

TSMIT

Text Box

TSMIT

Text Box

240 Blackfriars Road, London. SE1 8NW. [email protected] T: 020 7631 5291

TSMIT

Text Box

Map reproduced from Ordnance Survey man data by permission of the Ordnance Survey. License No: 100048749

TSMIT

Text Box

Figure 1.1

tsmit

Text Box

Figure 2.1

Scale

Date:

31/03/15 TSFigure No.

Tel: 020 7631 5291Fax 020 7323 4645

Figure 2.2Project Title

rev.

Prepared by

Figure Title

Mill Lane, Taplow

Site BoundaryJubilee Riverside South

Project Number

61033137

[email protected]

Client

Ü

0 10 20 30 40 505Metres

Berkeley Homes (ThreeValleys) Ltd

I01

LegendJubilee Riverside South Boundary

Approximate Redline Boundary

Map reproduced from Ordnance Survey map data by permission of the Ordnance Survey. Licence No: 100048749

>

A

>

>

>

A

A

A

>

>

>

>

>

A

A

D

A

D

D

D

D

D

D

D

D

D

D

>

>

>

>

>

7

7

7 7

7

7

7

77

S

S

S

S

S

S

S

S

S

S

?

?

?

?

?

?

?

R

RWS132

BH204

WS205

WS302WS203

BH201

BH203

BH301

WS301

WS201

WS202

WS206

WS204

BH205

BH202

TP615

BH602

2TP10

2TP9

2TP7

2TP8

2TP5

2TP6

2TP42TP3

2TP1

2TP2

RBH10

RBH11RBH11A

RBH12

RCPT07

RCPT08A

RCPT09RCPT09A

RCPT10

RCPT11

RCPT12

RCPT13RCTP13A

RTP01

RTP02

RTP03

RTP04

RTP05

RTP06

RTP07

RTP08

RTP19

RTP20

RWS16

RWS17

RWS19

RWS20

RWS21

RWS22

RWS23

SW02

SW05

Scale

Date:


Tel: 020 7631 5291Fax 020 7323 4645


rev.

Prepared by

Figure Title

Mill Lane, Taplow

Exploratory Hole PlanJubilee Riverside South

Project Number

61033137

[email protected]

Client

Ü

0 10 20 30 40 505Metres


I01


Key

Ramboll GI 2014/15> Borehole

7 CPT

) Stockpile Sample

R Surface Water Sample

S Trial Pit

? Windowless Sample

Provectus GI 2013A Borehole

< Monitoring Well

D Trial Pit

> Window Sample

CRA GI 2006A Borehole

< Monitoring Well

D Trial Pit

> Window Sample

Jubilee Riverside South Boundary


Warehouse

Gas Holder

Jubilee River

24.5m

MILL LANE

Warehouse

25.7m

Jubilee River

El Sub Sta

MILL LANE

24.0m 2TP40.9mMG77.3mg/kg

RTP030.7mMG53mg/kg

Scale

Date:


Tel: 020 7631 5291Fax 020 7323 4645

Figure2.4Project Title

rev.

Prepared by

Figure Title

Mill Lane, Taplow

Jubilee Riverside SouthArsenic Distribution(GAC 37mg/kg)

Project Number

61033137

[email protected]

Client

Ü


I01


1:750 @A4

Arsenic< GACGAC - 2x GAC2x GAC - 5x GAC5x - 10x GAC>10x GACJubilee Riverside South Boundary

Warehouse

Gas Holder

Jubilee River

24.5m

MILL LANE

Warehouse

25.7m

Jubilee River

El Sub Sta

MILL LANE

Gas Meter

24.0m

2TP102.5mMG209mg/kg

2TP40.9mMG445mg/kg

2TP40.5m

MG498mg/kg

RBH11A0.9mMG230mg/kg

RBH120.6mMG240mg/kg

RTP030.7mMG2300mg/kg

RTP040.9mRTD210mg/kg

RTP070.8mMG220mg/kg

RWS190.5m

MG460mg/kg

Scale

Date:


Tel: 020 7631 5291Fax 020 7323 4645


rev.

Prepared by

Figure Title

Mill Lane, Taplow

Jubilee Riverside SouthLead Distribution (GAC 200mg/kg)

Project Number

61033137

[email protected]

Client

Ü


I01


1:750 @A4

Lead<GACGAC - 2x GAC2x GAC - 5x GAC5x GAC - 10x GAC>10x GACJubilee Riverside South Boundary

Warehouse

Gas Holder

Jubilee River

24.5m

MILL LANE

Warehouse

25.7m

Jubilee River

El Sub Sta

MILL LANE

24.0m

2TP40.5mMG3700mg/kg

Scale

Date:


Tel: 020 7631 5291Fax 020 7323 4645


rev.

Prepared by

Figure Title

Mill Lane, Taplow

Jubilee Riverside SouthNickel Distribution(GAC 180mg/kg)

Project Number

61033137

[email protected]

Client

Ü


I01


1:750 @A4

Nickel< GACGAC - 2x GAC2x GAC - 5x GAC5x GAC to 10x GAC> 10xGACJubilee Riverside South Boundary

Warehouse

Gas Holder

Jubilee River

24.5m

MILL LANE

Warehouse

25.7m

Jubilee River

El Sub Sta

MILL LANE

24.0m

RTP030.4mMG6.8mg/kg

Scale

Date:


Tel: 020 7631 5291Fax 020 7323 4645


rev.

Prepared by

Figure Title

Mill Lane, Taplow

Jubilee Riverside SouthNaphthalene Distribution(GAC 5.6mg/kg)

Project Number

61033137

[email protected]

Client

Ü


I01


1:750 @A4

Naphthalene< GACGAC - 2x GAC2x - 5x GAC5x - 10x GAC>10x GACJubilee Riverside South Boundary

Warehouse

Gas Holder

Jubilee River

24.5m

MILL LANE

Warehouse

25.7m

Jubilee River

El Sub Sta

MILL LANE

24.0m

RTP050.9mMG47mg/kg

RTP070.8mMG15mg/kg

RTP200.9mMG15mg/kg

Scale

Date:


Tel: 020 7631 5291Fax 020 7323 4645


rev.

Prepared by

Figure Title

Mill Lane, Taplow

Jubilee Riverside South Benzo(a)anthracene Distribution (GAC 11mg/kg)

Project Number

61033137

[email protected]

Client

Ü


I01


1:750 @A4

Benzo(a)anthracene<GACGAC - 2x GAC2x GAC - 5x GAC5x GAC - 10x GAC>10x GACJubilee Riverside South Boundary

Warehouse

Gas Holder

Jubilee River

24.5m

MILL LANE

Warehouse

25.7m

Jubilee River

El Sub Sta

MILL LANE

24.0m

RTP030.7mMG5.5mg/kg

RTP050.9mMG36mg/kg

RTP070.8mMG16mg/kg

RTP200.9mMG11mg/kg

Scale

Date:


Tel: 020 7631 5291Fax 020 7323 4645


rev.

Prepared by

Figure Title

Mill Lane, Taplow

Jubilee Riverside SouthBenzo(a)pyrene Distribution (GAC 2.7mg/kg)

Project Number

61033137

[email protected]

Client

Ü


I01


1:750 @A4

Benzo(a)pyrene<GACGAC - 2x GAC2x GAC - 5x GAC5x GAC - 10x GAC>10x GACJubilee Riverside South Boundary

Warehouse

Gas Holder

Jubilee River

24.5m

MILL LANE

Warehouse

25.7m

Jubilee River

El Sub Sta

MILL LANE

24.0m

RTP030.7mMG5.9mg/kg

RTP050.9mMG47mg/kg

RTP070.8mMG19mg/kg

RTP200.9mMG13mg/kg

Scale

Date:


Tel: 020 7631 5291Fax 020 7323 4645


rev.

Prepared by

Figure Title

Mill Lane, Taplow

Jubilee Riverside SouthBenzo(b)flouranthene Distribution (GAC 3.3mg/kg)

Project Number

61033137

[email protected]

Client

Ü


I01


1:750 @A4

Benzo(b)flouranthene< GACGAC - 2x GAC2x GAC - 5x GAC5x GAC -10x GAC> 10x GACJubilee Riverside South Boundary

Warehouse

Gas Holder

Jubilee River

24.5m

MILL LANE

Warehouse

25.7m

Jubilee River

El Sub Sta

MILL LANE

Stage

24.0m

RTP050.9mMG45mg/kg

Scale

Date:


Tel: 020 7631 5291Fax 020 7323 4645


rev.

Prepared by

Figure Title

Mill Lane, Taplow

Jubilee Riverside SouthChrysene Distribution (GAC 22mg/kg)

Project Number

61033137

[email protected]

Client

Ü


I01


1:750 @A4

Chrysene< GACGAC - 2x GAC2x GAC - 5x GAC5x GAC- 10x GAC10x GACJubilee Riverside South Boundary

Warehouse

Gas Holder

Jubilee River

24.5m

MILL LANE

Warehouse

25.7m

Jubilee River

El Sub Sta

MILL LANE

Stage

24.0m

RTP030.7mMG0.8mg/kg

RTP050.9mMG3.8mg/kg

RTP070.8mMG1.3mg/kg

RTP200.9mMG0.84mg/kg

Scale

Date:


Tel: 020 7631 5291Fax 020 7323 4645


rev.

Prepared by

Figure Title

Mill Lane, Taplow

Jubilee Riverside SouthDibenzo(a,h)anthracene Distribution (GAC 0.28mg/kg)

Project Number

61033137

[email protected]

Client

Ü


I01


1:750 @A4

Dibenzo(a,h)anthracene<GACGAC - 2x GAC2x GAC - 5x GAC5x GAC - 10x GAC>10x GACJubilee Riverside South Boundary

Warehouse

Gas Holder

Jubilee River

24.5m

MILL LANE

Warehouse

25.7m

Jubilee River

El Sub Sta

MILL LANE

24.0m

RTP050.9mMG560mg/kg

Scale

Date:


Tel: 020 7631 5291Fax 020 7323 4645


rev.

Prepared by

Figure Title

Mill Lane, Taplow

Jubilee Riverside SouthTPH Aromatic C16-C21 Distribution (GAC 540mg/kg)

Project Number

61033137

[email protected]

Client

Ü


I01


1:750 @A4

TPH Aromatic C16-C21< GACGAC - 2x GAC2x GAC - 5x GAC5x GAC - 10X GAC>10x GACJubilee Riverside South Boundary

Warehouse

Gas Holder

Jubilee River

24.5m

Weir

MILL LANE

Warehouse

25.7mEl Sub Sta

MILL LANE

StageLanding

Landing Stage

24.0m

Lodge

RTP040.45mMGChrysotile FibresAmosite Fibres

0.033%w/w

0.002%w/w

0.005%w/w

0.013%w/w

0.004%w/w

<0.001w/w

<0.001w/w

<0.001w/w <0.001w/w

<0.001w/w

<0.001w/w

2TP10.6mMGAmosite

2TP20.5mMGAmosite

2TP30.8mMGChrysotile 2TP4

0.9mMGChrysotile & Amosite

2TP60.7mMGAmosite

2TP70.6m

MGChrysotile &

Amosite2TP81mMGChrysotile

Chrysotile Fibres

RBH100.5m

MGChrysotile Fibres

RBH11A0.9mMGChrysotile Cement& BoardRBH12

0.4mMG

Chrysotile Fibres

RTP030.4m

MGChrysotile Ladding

& Amosite Fibres

RTP030.7mMGChrysotile Fibres

RTP051.35m

MGChrysotile

Cement

RWS190.5mMGChrysotile & Amosite Insultation

RWS201.3m

MGChrysotile &

Crocidolite Fibres

RWS200.8mMGAmosite Fibres

RWS220.4m

MGChrysotile Fibres

Scale

Date:


Tel: 020 7631 5291Fax 020 7323 4645


rev.

Prepared by

Figure Title

Mill Lane, Taplow

Jubilee Riverside SouthAsbestos Distribution

Project Number

61033137

[email protected]

Client

Ü


I01


1:750 @A4

Asbestos Containing MaterialsNon DetectDetectedJubilee Riverside South Boundary

Warehouse

Gas Holder

Jubilee River

24.5m

MILL LANE

Warehouse

25.7mEl Sub Sta

MILL LANE

Stage

Gas Meter

Landing

24.0m

RTP030.4mRTD11ug/l

RTP040.45mMG9.1ug/l

Scale

Date:


Tel: 020 7631 5291Fax 020 7323 4645


rev.

Prepared by

Figure Title

Mill Lane, Taplow

Jubilee Riverside SouthLeachable Lead Distribution (GAC 7.2ug/l)

Project Number

61033137

[email protected]

Client

Ü


I01


1:750 @A4

Leachable Lead<GACGAC - 2x GAC2x GAC - 5x GAC5x GAC - 10x GAC>10x GACJubilee Riverside South Boundary

Warehouse

Gas Holder

Jubilee River

24.5m

MILL LANE

Warehouse

25.7mEl Sub Sta

MILL LANE

Stage

Gas Meter

Landing

24.0m

RTP060.75mMG0.8ug/l

Scale

Date:


Tel: 020 7631 5291Fax 020 7323 4645


rev.

Prepared by

Figure Title

Mill Lane, Taplow

Jubilee Riverside SouthLeachable Mercury Distribution (GAC 0.05ug/l)

Project Number

61033137

[email protected]

Client

Ü


I01


1:750 @A4

Leachable Mercury<GACGAC - 5x GAC5x GAC - 10x GAC>10x GACJubilee Riverside South Boundary

A

A

A

>

>

>

?

U

U

BH203

BH205

BH202

RBH10

RBH11A

RBH12

RWS19

JBRS/SW01

JBRS/SW02

Scale

Date:


Tel: 020 7631 5291Fax 020 7323 4645


rev.

Prepared by

Figure Title

Mill Lane, Taplow

Groundwater and Surface Water Monitoring LocationsJubilee Riverside South

Project Number

61033137

[email protected]

Client

Ü

0 10 20 30 40 505Metres


I01


Key


? Windowless Sample

U Surface Water Sample

CRA GI 2006A Borehole



>

?

>

>

?

?

>

>

>

>

>

?

?

?

?

?

BH204

WS203

BH201

BH203

WS201

WS204

BH205

BH202

RBH10

RBH11A

RBH12

RWS19

RWS20

RWS21

RWS22

RWS23

Scale

Date:


Tel: 020 7631 5291Fax 020 7323 4645


rev.

Prepared by

Figure Title

Mill Lane, Taplow

Monitoring Wells for DecommissioningJubilee Riverside South

Project Number

61033137

[email protected]

Client

Ü

0 10 20 30 40 505Metres


I01


Key


? Windowless Sample

CRA GI 2006> Borehole

? Windowless Sample



jubilee riverside south mill lane, taplow remediation … · 2015. 6. 5. · report (ramboll,...

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