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SOP for Decontamination of Field Sampling Equipment — Hansen Project 3 <br />consecutively numbered pages. The information entered in the fieldbook concerning decontamination should <br />include the following: <br />• Decontamination personnel <br />• Date and start and end times <br />• Type of detergents and type or source of water used in decontamination <br />• Disposal of spent wash and rinse solutions <br />• Decontamination methods and observations <br />• Weather conditions (for onsite decontamination only) <br />Documentation of offsite decontamination is not required, other than to note in the field book that clean, <br />decontaminated equipment was used during sample collection. <br />6. DISCUSSION <br />The overall objective of the sampling programs is to obtain samples which accurately depict the chemical, <br />physical, and/or biological conditions at the sampling site. Extraneous contaminant materials can be brought <br />onto the sampling location and/or introduced into the medium of interest during the sampling program (e.g., by <br />bailing or pumping of groundwater with equipment previously contaminated at another sampling site). Trace <br />quantities of these contaminant materials can thus be captured in a sample and lead to false positive analytical <br />results and, ultimately, to an incorrect assessment of the contaminant conditions associated with the site. <br />Decontamination of sampling equipment (e.g., bailers, pumps, and tubing) and field support equipment (e.g. <br />vehicles and personal protective equipment) is therefore required to ensure that sampling cross - contamination <br />is prevented, and that on -site contaminants are not carried off -site. <br />4153A.140129 Whetstone Associates <br />