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IA PURPOSE AND SCOPE <br /> This document defines a standard operating procedure (SOP) for col- <br /> lecting vadose zone soil samples for DBCP analysis using hollow-stem <br /> augers. <br /> The objective of the sampling program is to determine the distribution <br /> of DBCP in the vadose zone underlying agricultural sites where DBCP <br /> was historically applied. This SOP is intended to help assure that the <br /> data obtained will meet acceptable standards of accuracy, precision, <br /> comparability, representativeness and completeness. <br /> This SOP also describes equipment, field procedures, sample contain- <br /> ers, decontamination, documentation, storage and holding times, and <br /> field Quality Assurance/Quality Control (QA/QC) procedures. <br /> This SOP shall be strictly followed; any modification to the procedure <br /> shall be approved by the Project Manager or Task Leader in advance. <br /> l <br /> III 1-1 <br />