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CONTAMINATED LAND RISK ASSESSMENT
PHASE 1 DESK TOP STUDY
BNP Paribas Real Estate
Land at Chawton Park Road
Alton
Soil Environment Services Ltd
October 2013
Soil Environment Services Ltd
The Nanotechnology Centre, Herschel Building, Kings Road, Newcastle upon Tyne, NE1 7RU
Tel. 0191 243 0686
Fax. 0191 222 3528 Email: [email protected]
Our Ref: SES/BNP/CPR/1#1 Date: 22nd
October 2013
Client:
BNP Paribas Real Estate Advisory & Property Management UK Ltd
5 Aldermanbury Square
London
EC2V 7BP
CONTAMINATED LAND RISK ASSESSMENT
PHASE 1 DESK TOP STUDY
Land at Chawton Park Road
Alton
A report prepared on behalf of Soil Environment Services by:
Louise Tavasso BSc
Environmental Consultant
Checked by:
Dr Robin S Davies BSc PhD MISoilSci PGC Contaminated Land Management
Managing Director
INSTITUTE OF PROFESSIONAL SOIL SCIENTISTS
This report has been prepared by Soil Environment Services
with all reasonable skill, care and diligence, within the
terms of the Contract with the Client. The report is the
property of the client and Soil Environment Services accept
no responsibility of whatever nature to third parties to
whom this report may be made known. No part of this
document may be reproduced without prior written
approval of the Client.
Soil Environment Services Agricultural Land Classification, Contaminated Land
Risk Assessment, Mineral Extraction Soil Planning The Nanotechnology Centre, Herschel Building, Kings Rd, Newcastle upon Tyne NE1 7RU
Tel: 0191 243 0686 Fax: 0191 222 3528 Email: [email protected] www.soilenvironmentservices.co.uk
BNP Paribas Real Estate Contaminated Land Risk Assessment Chawton Park Road
Soil Environment Services Page 3
CONTENTS
Page
1. INTRODUCTION AND OBJECTIVES 4
2. SITE CHARACTERISATION AND FORMER INVESTIGATIONS 5
3. CONCEPTUAL SITE MODEL 9
3.1 Sources 9
3.2 Receptors 9
3.3 Pathways and plausible pollutant linkages 10
4. RISK ASSESSMENT 12
4.1 Human health 12
4.2 Controlled waters 13
4.3 Ecology 13
5. UNCERTAINTIES AND PHASE 2 PROPOSALS 14
DRAWING 1 Current site setting
APPENDIX A Historical maps
APPENDIX B Environmental data
BNP Paribas Real Estate Contaminated Land Risk Assessment Chawton Park Road
Soil Environment Services Page 4
1. INTRODUCTION AND OBJECTIVES
The purpose of this assessment is to examine specifically the current and potential risks
to human, ecological and ground and surface water receptors associated with possible
contamination of the ground at the site located at:
Land at Chawton Park Road
Alton
GU34 1RF
Ref: 470770,138210
The development proposal is for the renewal of extant permission 21068/032 – single
storey pavilion with bowling green and associated parking.
Evaluation of the risks is given and subsequently, if needed, recommendations made with
regard to further (Phase 2) investigation and/or remediation.
General guidance used:
BS 10175:2011 Investigation of potentially contaminated sites. British Standards
Institution, London.
CLR 11: Model procedures for the management of land contamination. Environment
Agency.
Environment Agency Guiding Principals for Land Contamination (GPLC).
(2010) Environment Agency.
BNP Paribas Real Estate Contaminated Land Risk Assessment Chawton Park Road
Soil Environment Services Page 5
2. SITE CHARACTERISATION AND FORMER INVESTIGATIONS
Current setting and condition (Drawing 1)
The site assessed for this investigation currently comprises 0.914 ha of land located on
Chawton Park Road, Alton. A road bounds the site to the north, with a girl-guide hut to
the east, a railway track to the south, tennis courts to the south-west and a cardiac
rehabilition building to the north-west (Photo 1). An open grassed area of land with trees
occupies the site (Photo 2). The site is approximately 1 m above the level of the road to
the north, with the topography of the site and surrounding land sloping down to the east.
The railway to the south is at a lower elevation in relation to the site.
Photo 1.(Aerial view)
Photo 2 (View from a road – NW to SE)
BNP Paribas Real Estate Contaminated Land Risk Assessment Chawton Park Road
Soil Environment Services Page 6
Site history (see Historical maps – Appendix A)
Land use Direction Distance (m) Notes
On-site
Undeveloped land with trees (pre 1873) On-site 0
Pavilion marked (1873-1973) On-site 0
Sports ground (1937-1973) On-site 0
Off site
Railway track (pre 1874-current) SE 4
Farm (pre 1874-1966) SE 124
Well (1896-1897) SE 128
Railway track (1910-1991) NE 123 Dismantled by 1991
Railway (1910-1992) SE 75
Former gravel pit (1937-1966) SE 154
Builders Yard (1966-1991) SE 154
Building developed c.2004 SW 1
Current soils, geology and hydrology
BGS maps indicate that the site is located on:
No superficial geology is recorded.
1:50 000 scale bedrock geology description: Holywell Nodular Chalk Formation - Chalk.
Sedimentary Bedrock formed approximately 89 to 100 million years ago in the
Cretaceous Period. Local environment previously dominated by warm chalk seas.
The closest BGS boreholes scans are 101 m west of the site;,
SU73NW40 — ALTON SPORTS CENTRE 2 (west of site) 470600,138061 Depth: 9.14m.
496410,191800 Depth: 747. Indicated: Topsoil over hard fissured chalk No groundwater was encountered. SU73NW39 — ALTON SPORTS CENTRE 1(west of site) 470580,138086 Depth: 9.14m
Indicated: Topsoil over hard fissured chalk No groundwater was encountered.
BNP Paribas Real Estate Contaminated Land Risk Assessment Chawton Park Road
Soil Environment Services Page 7
Flow to groundwater may occur through the soils to the aquifer at depth.
Surface water flow could find a possible route to surface water drains and channels to the
east leading to the Lavant Stream 267 m east of the site.
The site is on highly permeable Principal Bedrock aquifer and is not in a groundwater
source protection zone.
Zone II and Zone III of a groundwater source protection zone are situated 13 m north-
west.
Former investigations
No former investigations have been undertaken.
BNP Paribas Real Estate Contaminated Land Risk Assessment Chawton Park Road
Soil Environment Services Page 8
Current environmental data search
Environmental data (Appendix B) indicates the following:
The site is on a highly permeable Principal Bedrock aquifer
The site is not in a groundwater source protection zone.
No pollution inventory sites within 250 m
No waste treatment sites within 250 m
No pollution incidents within 250 m
No fuel sites within 250 m
No contemporary trade directory entries on site
No significant naturally elevated metal soil concentrations
No active landfill sites within 250 m
No historical landfill sites within 250 m
Radon is considered to be a risk (NE) as between 5-10% of homes are above the
action level for radon. Basic protection measures will need to be implemented in
the construction of new dwellings.
An inactive cardiac rehabilitation centre is listed 4 m south-west of the site.
BNP Paribas Real Estate Contaminated Land Risk Assessment Chawton Park Road
Soil Environment Services Page 9
3. CONCEPTUAL SITE MODEL
The conceptual site model detailed here is by a written and diagrammatical (Drawing 1)
description of the sources, pathways and receptors. A cross section is included if this will
aid interpretation.
3.1 Sources
Sources
Source location Direction Distance (m) Potential Contaminants
On-site
Radon On site (NE) 0
The property is in an intermediate
probability radon area, as between 5
and 10% of homes are above the
action level
Off site
Railway track (pre 1874-current) SE 4 Metals, hydrocarbons
Farm (pre 1874-1966) SE 124 Hydrocarbons, pesticides, herbicides
Well (1896-1897) SE 128 Methane, carbon dioxide
Railway track (1910-1991) NE 123 Metals, hydrocarbons
Railway (1910-1992) SE 75 Metals, hydrocarbons
Former gravel pit (1937-1966) SE 154 Methane, carbon dioxide
Builders Yard (1966-1991) SE 154 Metals, hydrocarbons, paints, solvents
3.2 Receptors
Humans
Residents and workers in the proposed development
Residents and workers in adjacent properties
Controlled waters
The site is on a highly permeable Principal Bedrock aquifer
The site is not in a groundwater source protection zone
Underlying aquifer
Ecology
● Animals and plants are considered to be possible receptors.
Buildings and services
Underground utility pipes
BNP Paribas Real Estate Contaminated Land Risk Assessment Chawton Park Road
Soil Environment Services Page 10
3.3 Pathways and plausible pollutant linkages (See Table 1)
Pathways to and from the site could exist via service channels.
Human health
The main pathways considered possible are:
1. Ingestion of soil
2. Ingestion of dust
3. Dermal contact with soil
4. Dermal contact with dust
5. Inhalation of fugitive soil dust
6. Inhalation of fugitive dust
7. Inhalation of vapours outside
8. Inhalation of vapours inside
9. Ingress to water supplies is also considered
Controlled waters
Flow to groundwater may occur through the soils to the aquifer at depth.
Surface water flow could find a possible route to surface water drains and channels to the
east leading to the Lavant Stream 267 m east of the site.
The site is on highly permeable Principal Bedrock aquifer and is not in a groundwater
source protection zone.
BNP Paribas Real Estate Contaminated Land Risk Assessment Chawton Park Road
Soil Environment Services Page 11
CSM Ref No. 1 Version a
SOURCE
TypeC urrent
workers
Fut ure
workers
D ev,ment
workers
C urrent
resident s
Fut ure
resident s
Ground
wat er
Surf ace
wat erEco logy
C urrent
workers
Fut ure
workers
D ev,ment
workers
C urrent
resident s
Fut ure
resident s
Ground
wat er
Surf ace
wat erEco logy
ON SITE
Radon Radon 1 N N N N Y N N N N N N N N N N N
OFF SITE
Metals 0 N N N N N N N N
Hydrocarbons 0 N N N N N N N N
Hydrocarbons 0 N N N N N N N N
Pesticides 0 N N N N N N N N
Herbicides 0 N N N N N N N N
Methane 0 N N N N N N N N
Carbon dioxide 0 N N N N N N N N
Metals 0 N N N N N N N N N/A
Hydrocarbons 0 N N N N N N N N
Methane 0 N N N N N N N N
Carbon dioxide 0 N N N N N N N N
Metals 0 N N N N N N N N
Hydrocarbons 0 N N N N N N N N
Paints 0 N N N N N N N N
Solvents 0 N N N N N N N N
For receptors and plausible linkages see Sections 3.2 and 3.3 of the report.
Notes
For risks from sources on-site and sources off-site see Section 4 of the report.
NA = not applicable
For sources and contaminants see Section 3.1 of the report.
TABLE 1. Plausible pollutant linkage/pathway matrix Y = yes, N = no, N/A = not applicable
RECEPTORS
On site Off sitePossible
present
1 yes, 0 no
Chemicals
Railway track
Former gravel pit
Former builders yard
Former farm
Former well
Former railway
tracks
BNP Paribas Real Estate Contaminated Land Risk Assessment Chawton Park Road
Soil Environment Services Page 12
4. RISK ASSESSMENT
4.1 Human health
No significant risks are considered to exist (Table 2).
Table 2. Risks from possible sources
Source location Direction Distance (m) Potential Contaminants Risk Reason
On-site
Radon On-site (NE) 0 Radon Yes 5 and 10% of properties are above the action level
Off site
Railway track (current) SE 4 Metals, hydrocarbons No Railway is at a lower elevation in relation to the site
Farm (pre 1874-1966) SE 124 Hydrocarbons, pesticides, herbicides No Natural attenuation, distance restricting pathways
Well (1896-1897) SE 128 Methane, carbon dioxide No Natural attenuation of ground gases
Railway track (1910-1991) NE 123 Metals, hydrocarbons No Distance and topography restricting pathways
Railway track (1910-1992) SE 75 Metals, hydrocarbons No Distance restricting pathways
Former gravel pit (1937-1966) SE 154 Methane, carbon dioxide No Natural attenuation, distance restricting pathways
Builders Yard (1966-1991) SE 154 Metals, hydrocarbons, paints, solvents No Distance restricting pathways
Notes:
BNP Paribas Real Estate Contaminated Land Risk Assessment Chawton Park Road
Soil Environment Services Page 13 Final Report # 1
4.2 Controlled waters
No significant risk to groundwater or surface water is considered to exist as no
significant sources are considered to exist on the site and hence no plausible pollutant
linkages are present.
4.3 Ecology
No significant risk is considered to exist as no significant sources or receptors are
considered to exist on or within a significant distance of the site. Hence no plausible
pollutant linkages are present.
4.4 Buildings and services
No significant risk is considered to exist as no aggressive substances (e.g. acids, alkalis,
organic solvents, sulphates or chlorides) which may affects the building or plastic/metal
pipes are considered to exist on or within a significant distance of the site.
BNP Paribas Real Estate Contaminated Land Risk Assessment Chawton Park Road
Soil Environment Services Page 14 Final Report # 1
5. UNCERTAINTIES AND PHASE 2 PROPOSALS
Basic radon protective measures are considered necessary in the construction of new
dwellings.
No other significant plausible pollutant linkages or significant uncertainties are
considered to exist.
Therefore no Phase 2 investigation is considered to be needed.
A watching brief should be conducted during development works. Should any evidence
of contamination become apparent, all development works must cease until further
investigation is conducted.
DRAWING 1
Current site location
NOTES:
Site boundary
Soil Environment Services Ltd
Drawing number 1
Drawing title Site location plan
Scale 1:2500
Date 23/10/2013
N
APPENDIX A
Historical maps
APPENDIX B
Environmental data