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BALP-CHANG ASSOCIATES <br /> Sample Storage and Handling <br /> All samples are stored refrigerated in our "clean lab after arrived from the field. They are <br /> labeled with the date of sampling, project name, project number, boring or well number, and <br /> depth of sample. <br /> Samples selected for chemical testing are delivered to analytical laboratories the same day of <br /> sampling or within three days of the sampling date. According to EPA standards, samples must <br /> be processed and tested within the holding time set forth by EPA. These times varies from 48 <br /> hours to 28 days depending upon the requested test. To assure the sample quality, a chain-of- <br /> custody record form is maintained for all samples during travel to the laboratory. <br /> Samples of potential contamination or of known contamination are stored in .a refrigerator <br /> (designated for the storage of this type of samples only)at a temperature of 4'C. Those samples <br /> are kept for approximately 20 to 30 days from the sampling date, at which time they are <br /> extruded, properly disposed of, and the sample tubes are cleaned with TSP and rinsed with <br /> water. Other type of samples are held in regular sample storage area for 30 to 60 days from <br /> the sampling date, at which time they are discarded and the sample tubes are cleaned for the next <br /> project. <br /> 3 of 3 <br />