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April 24, 1989 <br /> File No.1705-2 <br /> five to ten- five-gallon-buckets of water is removed and/or the turbidity has subsided <br /> prior to sampling the groundwater. A TSP solution is used to wash the hand pump and <br /> later rinsed with water prior to sampling of the next well. <br /> Sample Storage and Handling <br /> All samples are stored refrigerated in our "cleats" fab. They are labeled with the date of <br /> sampling, project name,project number,boring number, and depth of sample. <br /> Samples selected for laboratory testing are delivered to analytical labs the same day of <br /> sampling or within three days of the sampling date. According to EPA standards, sam- <br /> pies must be processed and tested within the holding times set by EPA. These times vary <br /> from 48 hours to 28 days depending upon the requested test. <br /> Samples of potential contamination or of known contamination are stored in a refrigera- <br /> tor, (designated for this type of samples). The temperature is kept at appro�amately 400 <br /> ( Fahrenheit. Samples are kept for approximately 20 to 30 days from the sampling date, <br /> 1 atwhich time are discarded and the brass tubes and glass ware are cleaned with TSP and <br /> rinsed with water. <br /> I- <br /> ' Other samples are held for 30 to 60 days from the sample date, at which time they are <br /> discarded and the sample tubes are cleaned for the next project. <br /> f_ <br /> f <br /> i <br /> 1 <br /> A-3 <br />