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' October 11, 1993 <br /> Job No 93036 <br />' Page A - 2 <br /> Decontatmnation <br /> Decontamination procedures were used to avoid cross-contamination between wells All equipment <br /> which came in contact with the wells or the groundwater (including bailers, the -eater level meter, and <br />' the 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 stored <br /> on-site in properly labeled (Title 22 CCR § 66508) DOT-approved 55-gallon drums pending treatment <br />' in the on-site groundwater treatment system The bailer line was replaced with new nylon rope after the <br /> sampling of each well No part of the bailer or rope was allowed to come into contact with any <br /> potentially contaminated surface The decontamination procedure was followed between each well <br />' sampled, and wells were sampled in the order of increasing contarrunation. <br /> Quality Assurance <br /> t <br /> Quality assurance samples collected duan this event included a travel blank (labeled as "MW-A") and <br /> Q Y P g <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 /> tsamples to the laboratory <br /> 1 <br /> CON000�93036VQUAIi202 REP <br /> En�ineermg aid Construction, Inc <br />