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Decontamination <br /> Decontamination procedures were used to avoid cross-contamination between wells All <br /> equipment which carne In contact with the wells or the groundwater (including bailers, the <br /> water level meter, and the oil/water interface probe) was thoroughly cleaned before use <br /> with a non-phosphate detergent solution, then rinsed twice with potable water Used <br />' detergent solution and rinse water were collected and stored on-site in properly labeled <br /> (Title 22 CCR §66508) DOT-approved 55-gallon drums pending disposal The bailer line <br />' was replaced with new nylon rope after the sampling of each well No part of the bailer <br /> 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 <br />' sampled in the order of increasing contamination <br />' Quality Assurance <br /> Quality assurance samples collected during this event included a travel blank (labeled as <br />' "MW-A") and a duplicate sample from MW-30 (labeled as "Duplicate") A Chain-of- <br /> Custody Record containing the project name and number, sample identification numbers, <br />' date and time of collection, number of containers, analysis requested, and verification of <br /> sample container temperature from time of sampling until delivery to the laboratory, was <br /> filled out and signed by field personnel, and accompanied the samples to the laboratory <br /> II <br /> Du Pont Environmental Remediation Services • A-2 <br /> 0511 14 Rev Printed on Recycled Paper <br />