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Decontamination <br /> Decontamination procedures were used to avoid cross-contamination between wells All equipment <br /> which came 1n contact with the wells or the groundwater (including bailers, water level meter, and ' <br /> oil/water interface probe)was thoroughly cleaned before use with a non-phosphate detergent solution, <br /> then rinsed twice with potable water Used detergent solution and rinse water were collected and <br /> stored on-site in properly labeled (Title 22 CCR §66508) DOT-approved 55-gallon drums pending <br /> disposal The bailer line was replaced with new nylon rope after the sampling of each well No part <br /> of the bailer or rope was allowed to come into contact with any potentially contaminated surface The <br /> decontamination procedure was followed between each well sampled, and the wells were sampled in <br /> the order of increasing contamination <br /> Quality Assurance ' <br /> Quality assurance samples collected during this event included a travel blank (labeled as "MW-A') and , <br /> a duplicate sample from MW-30 (labeled as "Duplicate") A Chain-of-Custody Record containing the <br /> project name and number, sample identification numbers, date and time of collection, number of , <br /> containers, analysis requested, and verification of sample container temperature from time of sampling <br /> until delivery to the laboratory, was filled out and signed by field personnel, and accompanied the <br /> samples to the laboratory , <br /> 1 <br /> Du Pont Environmental Remediation Services A-2 <br /> 4005114 Rev o Pnnied on Recycled Paper ' <br />