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December 23, 1999 ~ • Page D-1 <br />' APPENDIX D <br />STANDARD OPERATING PROCEDURE FOR EQUIPMENT DECONTAMINATION <br />' D.1 INTRODUCTION <br />' The purpose of this document is to define the standard operating procedure (SOP) for <br />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 />- Stainless steel wash tubs or 5-gallon buckets <br />- Plastic scrapers <br />' Sponges or paper towels <br />- Laboratory-grade, nonphosphate detergent (low sudsing) (e.g. Alconox, Liquinox) <br />' Potable water <br />- Distilled water, including laboratory-grade distilled water <br />- Spray bottles or garden-type water sprayers <br />- Clean plastic sheeting and/or trash bags <br />' Agapito Associates, Inc. <br />