EN ISO 24212:2024

• Abstract:

  This document provides requirements and guidance on key aspects of remediation techniques. It describes the principles, main characteristics, advantages and limitations to be considered in the selection within an option appraisal of individual or combinations of in situ and on-site remediation techniques, including:; — the type of contaminants to be dealt with;; — current and/or intended site use;; — local legal, policy, socio-economic and environmental contexts.; This document is applicable to the remediation of contaminated sites, i.e. where soil, or soil gas, ambient air or groundwater are contaminated. It identifies which phase/matrix can be targeted by a technique, e.g. fluid (groundwater, gas, non-aqueous phase liquid) or solid, and which contaminant it can applied to. This document also provides information on hazards that can be associated with the implementation of remediation.; This document does not provide:; — an exhaustive list of remediation techniques;; — guidance on sites contaminated with radioactive substances, pathogenic or infectious agents, or “pyrotechnic devices” (e.g. unexploded ordnances);; — guidance on ex situ techniques that are set up off-site;; — a framework that covers all individual situations, or prescribes which technique(s) to use in a specific context.

• Status: Published
• Publication Date: 01-Oct-2024
• ICS: 13.080.01 - Soil quality and pedology in general
• Technical Committee: CEN/TC 444 - Environmental characterization
• Drafting Committee: CEN/TC 444 - Environmental characterization
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 02-Oct-2024
• Completion Date: 02-Oct-2024
• Ref Project: SIST EN ISO 24212:2025 - Remediation techniques applied at contaminated sites (ISO 24212:2024)

• Consolidated By: ISO 24212:2024 - Remediation techniques applied at contaminated sites
• Effective Date: 12-Feb-2026

Overview - EN ISO 24212:2024 (Remediation techniques applied at contaminated sites)

EN ISO 24212:2024 (adopted by CEN) provides requirements and guidance for selecting and applying remediation techniques at contaminated sites. The standard describes principles, main characteristics, advantages and limitations of individual and combined in situ and on-site remediation options. It supports option appraisal by linking technique applicability to contaminant types, targeted matrices (soil, soil gas, ambient air, groundwater, non‑aqueous phase liquids) and site‑specific contexts such as current/intended land use, legal and socio‑environmental constraints. The document also summarises hazards associated with remediation implementation and generic risk management considerations.

Key topics and technical requirements

• Scope of applicability: Techniques aimed at contaminated soil, soil gas, ambient air and groundwater; identifies which phase/matrix a technique can target.
• Technique descriptions: For common remedial approaches (for example ISCO - in situ chemical oxidation; ISCR - in situ chemical reduction; EISB - enhanced in situ bioremediation) the standard provides:
  • Principle and technology description
  • Scope and operating window (where applicable)
  • Design considerations and dimensioning guidance
  • Key monitoring parameters
  • Advantages, limitations and EHS (environment, health and safety) aspects
  • Potential combinations with other techniques or containment measures
• Selection process: Good practice for strategy/option appraisal including identification of feasible strategies, detailed evaluation and selection of a final remediation approach considering local legal, policy and socio‑economic context.
• Hazards & risk management: Generic risk management process covering hazards such as dust, odours, contaminated wastes, plant/equipment risks, ground stability, UXO considerations, confined spaces and long‑term monitoring needs.
• Limitations: Does not present an exhaustive list of techniques; excludes sites contaminated with radioactive substances, pathogenic/infectious agents or pyrotechnic devices, and does not cover off‑site ex‑situ techniques.

Applications - who uses EN ISO 24212:2024

• Environmental consultants and remediation designers conducting option appraisals and developing remedial action plans
• Site owners, developers and project managers planning brownfield redevelopment or risk‑based land management
• Regulators and permitting authorities assessing proposed remediation strategies
• Environmental engineers and contractors selecting, configuring and monitoring on‑site/in‑situ remediation systems
• Risk assessors and health & safety professionals integrating remediation hazards into site safety plans

Practical value / benefits

• Helps match remedial techniques to contaminants and target matrices (soil, groundwater, NAPL, vapour)
• Improves transparency in remediation option appraisal and decision‑making
• Provides a common reference for EHS, monitoring and combined‑technique planning

Related standards

• Documents from ISO Technical Committee ISO/TC 190 (Soil quality) and CEN/TC 444 are closely related; consult national standards bodies for harmonised guidance and complementary standards on site investigation, soil quality assessment and risk assessment.

SLOVENSKI STANDARD
01-marec-2025
Tehnike sanacije, ki se uporabljajo na onesnaženih območjih (ISO 24212:2024)
Remediation techniques applied at contaminated sites (ISO 24212:2024)
Sanierungstechniken an kontaminierten Standorten (ISO 24212:2024)
Techniques de dépollution appliquées aux sites pollués (ISO 24212:2024)
Ta slovenski standard je istoveten z: EN ISO 24212:2024
ICS:
13.020.40 Onesnaževanje, nadzor nad Pollution, pollution control
onesnaževanjem in and conservation
ohranjanje
13.080.01 Kakovost tal in pedologija na Soil quality and pedology in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 24212
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2024
EUROPÄISCHE NORM
ICS 13.080.01
English Version
Remediation techniques applied at contaminated sites
(ISO 24212:2024)
Techniques de dépollution appliquées aux sites pollués Sanierungstechniken an kontaminierten Standorten
(ISO 24212:2024) (ISO 24212:2024)
This European Standard was approved by CEN on 15 September 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 24212:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 24212:2024) has been prepared by Technical Committee ISO/TC 190 "Soil
quality" in collaboration with Technical Committee CEN/TC 444 “Environmental characterization of
solid matrices” the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by April 2025, and conflicting national standards shall be
withdrawn at the latest by April 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 24212:2024 has been approved by CEN as EN ISO 24212:2024 without any modification.

International
Standard
ISO 24212
First edition
Remediation techniques applied at
2024-09
contaminated sites
Techniques de dépollution appliquées aux sites pollués
Reference number
ISO 24212:2024(en) © ISO 2024
ISO 24212:2024(en)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 24212:2024(en)
Contents Page
Foreword .viii
Introduction .ix
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 3
5 Overview . 5
5.1 Structure of this document .5
5.2 Generic concepts associated with remediation .6
6 Good practice for carrying out a strategies appraisal prior to implementing remediation
strategy . 8
6.1 General .8
6.2 Identifying feasible remediation strategies .9
6.3 Detailed evaluation of strategies appraisal .9
6.4 Selecting the final remediation strategy .11
7 Generic recommendations for the selection of remediation techniques .11
7.1 General .11
7.2 Considering the site’s context . 12
7.3 Remediation set up on-site . 13
7.4 Techniques prerequistes . 13
7.5 Techniques collateral effects .14
7.6 Laboratory testing and pilot tests.14
8 Generic recommendations for managing hazards and risks during remediation . 14
8.1 General .14
8.2 Risk management process . 15
8.2.1 General . 15
8.2.2 Hazards and controls associated with contaminated soil and groundwater . 15
8.2.3 Asbestos .16
8.2.4 Dust .16
8.2.5 Offensive or noxious odours .16
8.2.6 Contaminated waste .16
8.2.7 Remediation equipment .16
8.2.8 Unexpected finds .17
8.2.9 Long-term monitoring .17
8.2.10 Outdoor work .17
8.2.11 Remote or isolated working .17
8.2.12 Underground services and pipelines .17
8.2.13 Ground stability .18
8.2.14 Excavations .18
8.2.15 Unexploded ordnance (UXO) .18
8.2.16 Confined space .18
8.2.17 Hazardous chemicals and dangerous goods .18
8.2.18 Hazardous manual tasks .19
8.2.19 Slips, trips and falls .19
8.2.20 Plant and equipment .19
8.2.21 Noise .19
9 Remediation techniques description .20
9.1 In situ chemical oxidation (ISCO) . . 20
9.1.1 Technique principle . 20
9.1.2 Scope and applicability of the technique (operating window) . 20
9.1.3 Technology description . 20

iii
ISO 24212:2024(en)
9.1.4 Design considerations and dimensioning . 20
9.1.5 Key monitoring parameters .21
9.1.6 Advantages and limitations .21
9.1.7 Specific EHS aspects . .21
9.1.8 Other techniques or containment approaches that can be combined with the
technique . 22
9.2 In situ chemical reduction (ISCR) . 22
9.2.1 Technique principle . 22
9.2.2 Scope and applicability of the technique . 22
9.2.3 Technology description . 22
9.2.4 Design considerations and dimensioning . 22
9.2.5 Key monitoring parameters . 22
9.2.6 Advantages and limitations . 23
9.2.7 Specific EHS aspects . . 23
9.2.8 Other techniques that can be combined with the technique . 23
9.3 Enhanced in situ bioremediation (EISB) . 23
9.3.1 Technique principle . 23
9.3.2 Scope and applicability of the technique (operating window) . 23
9.3.3 Description of technology .24
9.3.4 Design considerations and dimensioning .24
9.3.5 Key monitoring parameters .24
9.3.6 Advantages and limitations .24
9.3.7 Specific EHS aspects . . 25
9.3.8 Other techniques or containment approaches that can be combined with the
technique . 25
9.4 Monitored natural attenuation (MNA) . 25
9.4.1 Technique principle . 25
9.4.2 Scope and applicability of the technique (operating window) . 25
9.4.3 Description of technology . 25
9.4.4 Design considerations and dimensioning . 25
9.4.5 Key monitoring parameters . 25
9.4.6 Advantages and limitations . 26
9.4.7 Specific EHS aspects . . 26
9.4.8 Other techniques or containment approaches that can be combined with the
technique . 26
9.5 Incineration . 26
9.5.1 Technique principle . 26
9.5.2 Scope and applicability of the technique . 26
9.5.3 Technology description . 26
9.5.4 Design considerations and dimensioning .27
9.5.5 Key monitoring parameters .27
9.5.6 Advantages and limitations .27
9.5.7 Specific EHS aspects . . 28
9.5.8 Other techniques or containment approaches that can be combined with the
technique . 28
9.6 In situ thermal remediation (ISTR) . 28
9.6.1 Technique principle . 28
9.6.2 Scope and applicability of the technique (operating window) . 28
9.6.3 Description of technology . 28
9.6.4 Design consideration and dimensioning . 29
9.6.5 Key monitoring parameters . 29
9.6.6 Advantages and limits . 29
9.6.7 Specific EHS aspects . . 30
9.6.8 Other techniques or containment approaches that can be combined with the
technique . 30
9.7 On-site thermal desorption . 30
9.7.1 Technique principle . 30
9.7.2 Scope and applicability of the technique (operating window) . 30
9.7.3 Technology description . 30

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ISO 24212:2024(en)
9.7.4 Design considerations and dimensioning . 30
9.7.5 Key monitoring parameters .31
9.7.6 Advantages and limits .31
9.7.7 Specific EHS aspects . .31
9.7.8 Other techniques or containment approaches that can be combined with the
technique .31
9.8 Soil vapour extraction (SVE) .31
9.8.1 Technique principle .31
9.8.2 Scope and applicability of the technique (operating window) .32
9.8.3 Technology description .32
9.8.4 Design and dimensioning considerations .32
9.8.5 Key monitoring parameters .32
9.8.6 Advantages and limits . 33
9.8.7 Specific EHS aspects . . 33
9.8.8 Other techniques or containment approaches that can be combined with the
technique . 33
9.9 Air-sparging . 33
9.9.1 Technique principle . 33
9.9.2 Scope and applicability of the technique (operating window) . 33
9.9.3 Technology description . 34
9.9.4 Design considerations and dimensioning . 34
9.9.5 Key monitoring parameters . 34
9.9.6 Advantages and limits . 34
9.9.7 Specific EHS aspects . . 34
9.9.8 Other techniques or containment approaches that can be combined with the
technique . 34
9.10 Multi-phase extraction (MPE) . 35
9.10.1 Technique principle . 35
9.10.2 Scope and applicability of the technique (operating window) . 35
9.10.3 Technology description . 35
9.10.4 Design considerations and dimensioning . 35
9.10.5 Key monitoring parameters . 35
9.10.6 Advantages and limitations . 36
9.10.7 Specific EHS aspects . . 36
9.10.8 Other techniques or containment approaches that can be combined with the
technique . 36
9.11 Dual pump liquid extraction (DPLE) . 36
9.11.1 Technique principle . 36
9.11.2 Scope and applicability of the technique (operating window) . 36
9.11.3 Technology description .37
9.11.4 Design considerations and dimensioning .37
9.11.5 Key monitoring parameters .37
9.11.6 Advantages and limitations .37
9.11.7 Specific EHS aspects . .37
9.11.8 Other techniques or containment approaches that can be combined with the
technique .37
9.12 Hydraulic techniques for groundwater remediation . 38
9.12.1 Technique principle . 38
9.12.2 Scope and applicability of the technique (operating window) . 38
9.12.3 Technology description . 38
9.12.4 Design considerations and dimensioning . 38
9.12.5 Key monitoring parameters . 39
9.12.6 Advantages and limitations . 39
9.12.7 Specific EHS aspects . . 39
9.12.8 Other techniques or containment approaches that can be combined with the
technique . 39
9.13 Soil washing . 39
9.13.1 Technique principle . 39
9.13.2 Scope and applicability of the technique (operating window) . 39

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ISO 24212:2024(en)
9.13.3 Technology description . 40
9.13.4 Design and dimensioning considerations . 40
9.13.5 Key monitoring parameters . 40
9.13.6 Advantages and limitations . 40
9.13.7 Specific EHS aspects . . 40
9.13.8 Other techniques or containment approaches that can be combined with the
technique .41
9.14 Biopiling .41
9.14.1 Technique principle .41
9.14.2 Scope and applicability of the technique (operating window) .41
9.14.3 Technology description .41
9.14.4 Design considerations and dimensioning .41
9.14.5 Advantages and limitations .42
9.14.6 Key monitoring parameters .42
9.14.7 Specific EHS aspect .42
9.14.8 Other techniques or containment approaches that can be combined with the
technique .42
9.15 Landfarming .43
9.15.1 Technique principle .43
9.15.2 Scope and applicability of the technique (operating window) .43
9.15.3 Technology description .43
9.15.4 Design considerations and dimensioning .43
9.15.5 Key monitoring parameters . 44
9.15.6 Advantages and limitations . 44
9.15.7 Specific EHS aspects . . 44
9.15.8 Other techniques or containment approaches that can be combined with the
technique . 44
9.16 Vertical barrier technologies (VBT) . 44
9.16.1 Technique principle . 44
9.16.2 Scope and applicability of the technique .45
9.16.3 Technology description .45
9.16.4 Design considerations and dimensioning .45
9.16.5 Key monitoring parameters .45
9.16.6 Advantages and limitations .45
9.16.7 Specific EHS aspects . . 46
9.16.8 Other techniques or containment approaches that can be combined with the
technique . 46
9.17 Cover systems . . 46
9.17.1 Technique principle . 46
9.17.2 Scope and applicability of the technique . 46
9.17.3 Technology description .47
9.17.4 Design considerations and dimensioning .47
9.17.5 Key monitoring parameters . 48
9.17.6 Avantages and limitations . 48
9.17.7 Specific EHS aspects . . 48
9.18 Permeable reactive barrier (PRB) systems . 49
9.18.1 Technique principle . 49
9.18.2 Scope and applicability of the technique (operating window) . 49
9.18.3 Technology description . 49
9.18.4 Design considerations and dimensioning . 49
9.18.5 Key monitoring parameters .
...