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Draft: April S, 1999 Page D-1 <br />' APPENDIX D <br />STANDARD OPERATING PROCEDURE FOR EQUIPMENT DECONTAMINATION <br />1 <br />' D.1 INTRODUCTION <br />The purpose of this document is to define the standazd operating procedure (SOP) for <br />t equipment decontamination at the American Soda, Yankee Gulch Sodium Project. This document <br />describes the materials and procedures for decontaminating the equipment used in groundwater and <br />' surface water sampling. This SOP serves as a supplement to the Groundwater and Surface Water <br />Monitoring Plan. <br />The overall objective of the sampling program is to obtain samples which accurately depict <br />the chemical, physical, and/or biological conditions of groundwater and surface water at the site. <br />' Extraneous materials can be introduced into the sample medium during the sampling program (e.g., <br />by bailing or pumping of groundwater with equipment previously used at another sampling site). <br />' Trace quantities of these materials can thus be captured in a sample and lead to false positive <br />analytical results and, ultimately, to an incorrect assessment of conditions associated with the site. <br />Decontamination ofnon-dedicated sampling equipment (e.g., bailers, pumps, and other equipment) <br />' is therefore required to prevent sampling cross-contamination. <br />' D.2 EQUIPMENT <br />' The following is a list of equipment that may be needed to perform decontamination: <br />~ Plastic brushes <br />' ~ Wash tubs or 5-gal buckets <br />Plastic scrapers <br />t ~ Sponges or paper towels <br />Laboratory-grade, nonphosphate detergent (low sudsing) (e.g. Alconox, Liquinix) <br />' ~ Potable water <br />' ~ Distilled or deionized water, including laboratory-grade distilled or deionized water <br />~ Spray bottles or gazden-type water sprayers <br />' ~ Clean plastic sheeting and/or trash bags <br />' Agapito Associates, Inc. <br />