ISO INTERNATIONAL STANDARD 18400-205 First edition 2018-10 Soil quality - Sampling - Part 205: Guidance on the procedure for investigation of natural, near-natural and cultivated sites Qualité du sol - Echantillonnage - Partie 205:Recommandations relatives aux modes opératoires d'investigation des sites naturels, quasi naturels et cultives Reference number IS0 18400-205:2018(E) ISO @ IS0 2018 IS0 18400-205:2018(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2018 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: +4122 749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2018 - All rights reserved IS0 18400-205:2018(E) Contents Page Foreword ..iv Introduction. .. 1 Scope 2 Normative references 3 Terms and definitions 4 Objectives of sampling ..2 5 Principles, requirements and general considerations for soil sampling .2 5.1 General. .2 5.2 General strategy of site investigation. .3 5.2.1 General 3 5.2.2 Conceptual site model. .5 5.2.3 Preliminary investigation. .5 5.2.4 Preliminary conceptual site model .5 5.2.5 Scope of exploratory investigation. 5 5.2.6 Scope of detailed site investigation .6 5.3 Types of sample. .6 5.4 Selection of sampling locations .6 5.5 Number of samples - General .7 5.6 Sampling depths. .7 5.7 Number of samples to be taken at discrete sampling points 5.8 Number of samples in relation to determination of average properties .8 5.9 Samplesizes ..8 5.10 Sampling techniques and application 9 5.11 Time and frequency of sampling .9 5.12 Sample containers. 9 5.13 Sample transport. .9 5.14 Sample storage .9 5.15 Safety .9 5.16 Quality assurance and control .10 6 Taking soil samples ..10 7 Sampling for particular purposes ..10 7.1 Sampling for the determination of mobile nitrogen .10 7.2 Forest and woodland soils. .11 7.3 Peat soils. .11 7.4 Saturated-zone soils ..11 7.5 Special types of land use. ..11 8 Sampling report. ..12 9 Investigation report .13 Bibliography .14 IS0 2018 - All rights reserved iii