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www.environment-agency.gov.uk
Model Procedures for the
Management of Land Contamination
Contaminated Land Report 11
www.environment-agency.gov.uk
The Environment Agency is the leading public body protecting and
improving the environment in England and Wales.
It’s our job to make sure that air, land and water are looked after by
everyone in today’s society, so that tomorrow’s generations inherit a
cleaner, healthier world.
Our work includes tackling flooding and pollution incidents, reducing
industry’s impacts on the environment, cleaning up rivers, coastal
waters and contaminated land, and improving wildlife habitats.
Publishing Organisation:
Environment Agency
Rio House
Waterside Drive, Aztec West
Almondsbury, Bristol BS32 4UD
Tel: 01454 624400 Fax: 01454 62409
Website: www.environment-agency.gov.uk
© Environment Agency September 2004
ISBN: 1844322955
All rights reserved. No part of this document may be reproduced,
stored in a retrieval system, or transmitted, in any form or by any
means, electronic, mechanical, photocopying, recording or
otherwise without the prior permission of the Environment Agency.
Officers, servants or agents of the Environment Agency and the
Department for Environment, Food and Rural Affairs accept no
liability whatsoever for any loss or damage arising from the
interpretation or use of the information, or reliance upon views
contained herein.
Dissemination status
Internal: Released to Regions
External: Public Domain
Cover photograph: Early development phases on the remediated
Barry No.1 Dock in South Wales. Provided courtsey of Associate
British Ports and the W
elsh Development Agency
.
Statement of use
The Model Procedures for the Management of Land Contamination
provides the technical framework for structured decision making
about land contamination. They encourage the formalisation of
outputs from the process in the form of written records that contain
details of specific project objectives, decisions and assumptions, as
well as recommendations and other specific outputs. The Model
Procedures are intended to assist all those involved with, or
interested in risk management of land affected by contamination.
Resear
ch contractor
This document was produced under the Science Project
SC02000028 by:
Casella Stanger,
Blakelands House,
400 Aldridge Road,
Great Barr,
Birmingham B44 8BH
Tel: 0121 344 6100
Fax: 0121 344 6111
Environment Agency’
s Project Manager
The Environment Agency’s project manager for Science Project
SC02000028 was: Theresa Kearney
, Science Group, Environment
Agency
,
Solihull.
cutter guide_does not print
Figure 1 The process of managing land contamination
No
Yes
No
No
Yes
Yes
No
Yes
No
Yes
No
No
No
Yes
No
Yes/possibly
Not known
Not known
Yes
No
No
Yes
Yes
START
Define the context &
set the objectives
Preliminary risk
assessment
Is further
assessment
required?
Are generic
assessment criteria
available &
appropriate?
Generic quantitative risk
assessment
Are there
unacceptable
risks?
Are there
unacceptable
risks?
Is
more detailed
assessment
appropriate?
Detailed
quantitative risk
assessment
Identification of
feasible remediation
options
Preparation of the
implementation plan
Adjust the
plan until
agreement
is reached
Adjust
design
and/or
arrangements
for
supervisor
Design,
implementation &
verification of works
Have
the works been
verified?
Are long-term
monitoring data
required?
Long-term
monitoring &
maintenance
Is further
remediation
required?
Have
feasible options
been identified?
Detailed evaluation
of options
Collect
more site
data &
review
assessment
Collect
more site
data &
review
assessment
Collect
more data
& review
objectives
o
r
m
onitor
c
ondition
Review
decisions
taken
earlier in
the process
Collect
more site
data &
review
assessment
Collect
more data
&/or
review
objectives
Define the context
& set or refine the
objectives
Not
known
Yes
Are
there potential
risks?
Yes
Yes
No
Can
the most
appropriate option
(or combination of
options) be
selected?
No
Yes
Development of the
remediation strategy
Define the context
& set or refine the
objectives
NO FURTHER
ACTION
REQUIRED
NO FURTHER
ACTION
REQUIRED
Is the
the implementation
plan agreed with all
parties?
Are
the monitoring data
acceptable?
Can an
appropriate strategy
be identified?
No
Risk Assessment Options Appraisal Implementation of
the Remediation Strategy
Note: The process may apply to one or more pollutant linkages each of which may follow a different route. For some linkages, it may be possible to stop at an
early stage – others will progress all the way through the process. The level of complexity of each stage may also vary and in some cases may be very simple.
Environment Agency
Contaminated Land Report 11
1
Contents
Part 1 Procedures
Acknowledgements 4
Foreword 5
Chapter 1
Overview of Model Procedures 6
1.1 Understanding land contamination 6
1.2 Managing risks from land contamination 7
1.3 Risk management and the Model Procedures 9
1.4 Using the Model Procedures 11
1.5 How the Model Procedures are presented 11
Chapter 2
Risk Assessment 13
2.1 Overview 16
2.2 Preliminary risk assessment 16
2.3 Generic quantitative risk assessment 18
2.4 Detailed quantitative risk assessment 20
Chapter 3
Options Appraisal 22
3.1 Overview 22
3.2 Identification of feasible remediation options 27
3.3 Detailed evaluation of options 29
3.4 Developing the remediation strategy 31
Chapter 4
Implementation of the Remediation Strategy 33
4.1 Overview 33
4.2 Preparing the implementation plan 38
4.3 Design, implementation and verification 40
4.4
Long-term monitoring and maintenance
42
Chapter 5
References and glossar
y
44
5.1 References 44
5.2 Glossary 44
Part 2
Supporting Information
Introduction to Part 2 47
T
ypes of supporting information 48
Guide to arrangement of supporting information
49
Supporting Information for Risk Assessment
50
Preliminary Risk Assessment (Section 2.2 of Part 1) 51
Generic Quantitative Risk Assessment (Section 2.3 of Part 1)
60
Environment Agency
Contaminated Land Report 11
2
Detailed Quantitative Risk Assessment (Section 2.4 of Part 1) 74
Supporting Information for Options Appraisal 86
Identification of Feasible Remediation Options (Section 3.2 of Part 1) 87
Detailed Evaluation of Options (Section 3.3 of Part 1) 105
Developing the Remediation Strategy (Section 3.4 of Part 1) 117
Supporting Information for Implementation of the Remediation Strategy
121
Preparing the Implementation Plan (Section 4.2 of Part 1) 122
Design, Implementation and Verification (Section 4.3 of Part 1) 131
Long-term Monitoring and Maintenance (Section 4.4 of Part 1) 149
Part 3 Information Map
INFO-RA Key Information Sources: Risk Assessment 158
INFO-OA Key Information Sources: Options Appraisal 159
INFO-IMP Key Information Sources: Implementation of the Remediation Strategy 160
INFO-SC Key Information Sources: Site Characterisation 161
INFO-PM Key Information Sources: Project Management 162
INFO-RA1 Key Information Sources: Preliminary Risk Assessment 163
INFO-RA2-1 Key Information Sources: Risk Assessment – General 165
INFO-RA2-2 Key Information Sources: Risk Assessment – Human Health 167
INFO-RA2-3 Key Information Sources: Risk Assessment – Water Environment 170
INFO-RA2-4 Key Information Sources: Risk Assessment – Gases and Vapours 172
INFO-RA2-5 Key Information Sources: Risk Assessment – Ecological Systems 174
INFO-RA2-6 Key Information Sources: Risk Assessment – Buildings and Services 175
INFO-OA1
Key Information Sour
ces: Options Appraisal – Identification of Feasible Remediation Options
176
INFO-OA2 Key Information Sources: Options Appraisal – Detailed Evaluation of Options 178
INFO-IMP1
Key Information Sources: Implementation of the Remediation Strategy – Planning 182
INFO-IMP2
Key Information Sources: Implementation of the Remediation Strategy – Implementation,
V
erification and Monitoring
182
INFO-SC1 Key Information Sources: Site Characterisation – General 183
INFO-SC2 Key Information Sources: Site Characterisation – Sampling Design 184
INFO-SC3 Key Information Sources: Site Characterisation – Field and Laboratory Analysis 185
INFO-PM1 Key Information Sources: Project Management – Guidance Specific to a Particular Industrial
or Commer
cial Sector 186
INFO-PM2 Key Information Sources : Project Management – Health and Safety and Quality Management 188
INFO-PM3
Key Information Sour
ces : Project Management – Communication 189
Information Map – Abbreviations And Document Sour
ce Details
190
Contact Details for Copies of Documents
191
I
[...]... explanation of the background to the risk assessment, the basis for the development of the conceptual model, the evaluation of the potential risks and the basis for the decision on what happens next Technical activities The steps shown in Figure 2A set out the model procedure for carrying out a preliminary risk assessment The banners to the right show the location of key supporting information in Part 2 of the. .. in the same way I Other characteristics of the site also affect the nature and level of risk in any case For example, the nature of the soil, the local climate and the underlying geology and hydrogeology all affect the risk presented by contamination This is the definition used in the Model Procedures, in the specific context of risks to health and the environment from land contamination Taking these...1 Overview of Model Procedures The Model Procedures for the Management of Land Contamination are intended to provide the technical framework for structured decision-making about land contamination .The basic process can be adapted to apply in a range of regulatory and management contexts, subject to any specific constraints arising from these contexts The Model Procedures are intended to... above 1.5 I How the Model Procedures are presented The Model Procedures consist of three parts – Procedures, Supporting Information and the Information Map These provide a hierarchy of information, in which Part 1 sets out the framework of the process, Part 2 provides further technical detail to support the process and Part 3 contains sources of further information and guidance Part 1 – Procedures Part... defined in large part by the particular condition and circumstances of any individual piece of land The details of the use of the land itself, as well as surrounding land, determine whether particular receptors and pathways are present and, if they are, the extent to which they might potentially be affected by contamination The environmental setting of the land, for example, the surrounding and underlying... – the pollutant linkages identified based on the development of the conceptual model; the generic assessment criteria used to assess risks; the unacceptable risks identified; and the proposed next steps in relation to the site An explanation of the development of the conceptual model (in particular the results of site investigation); the selection of criteria and assumptions; the evaluation of the potential... legal requirements Who should use the Model Procedures? Part 2 – Supporting Information Part 2 contains detailed supporting information to the procedures contained in Part 1, presented in the form of information boxes These contain examples of the inputs, tools, criteria and outputs used or generated throughout the process of risk management To facilitate the use of the information boxes, each is ‘badged’... Criteria for judging whether or not there are unacceptable risks The risk assessment process focuses on the question of whether there is an unacceptable risk, which will depend on the circumstances of the site and the context of the decision The selection of transparent and appropriate criteria is critical There can be different criteria for different receptors For example, under the Part IIA regime, the. .. conceptual model (in particular the results of site investigation); the development and choice of criteria, tools and assumptions for risk estimation; the evaluation of the potential risks; and the basis for the decision on what happens next Technical activities The steps shown in Figure 2C set out the model procedure for carrying out detailed quantitative risk assessment The banners to the right show the. .. stage of Model Procedures The purpose of preliminary risk assessment is to develop an initial conceptual model of the site and establish whether or not there are potentially unacceptable risks At the beginning of this stage the person who carries out the risk assessment – the assessor – has identified the site to be considered and the context for the risk assessment During this stage the assessor collects . in the Model Procedures, in the specific context of risks to health and the environment from land contamination. The idea of the “pollutant linkage” In the context of land contamination, there. greenfield land. The Model Procedures for the Management of Land Contamination, CLR 11, have been developed to provide the technical framework for applying a risk management process when dealing with land affected. in the form of information boxes. These contain examples of the inputs, tools, criteria and outputs used or generated throughout the process of risk management. To facilitate the use of the information
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