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. San Joaquin County Public Health Services Environmental Health Division November 1, 1994 Page 5 The sampler will be fitted with 2-inch diameter, 3-inch long stainless steel rings Sample rings will be separated with a clean soil knife The exposed ends of the rings will be covered with Teflon sheets and secured with tight-fitting plastic end caps Sample labels will be affixed to the end caps and will contain the following information boring number, sample location, sample number, sample depth, date of sampling, sample collector's initials, ,lob number and name of facility Three rings from the 18-inch driven sampler will be retained from each sample interval These samples will have the same sample identification numbers except for postscripts "A,B, or C" The lowest ring, Sample "A", will generally be retained for chemical testing, or frozen for possible future chemical analysis, "B" samples will be screened with the PID, and the "C" samples will be retained for possible physical testing Appropriately sealed and labeled samples will be placed in cooled ice chests The ice chests will also serve as containers for shipping samples to the analytical laboratory Chain-of-custody records will be maintained using standard forms, and routed to the analytical laboratory with the sealed ice-chests containing the samples Equipment Decontamination All downhole drilling equipment and tools will be steam cleaned prior to and following the boring A clean area on-site will be designated as the steam cleaning station. This area will be lined or otherwise prepared to contain the rinsate generated during steam cleaning Rinsate will be transferred from the containment area to DOT-approved containers, sealed, labeled, and stored on- site until analytical results are received After each use, samplers will be washed thoroughly in a detergent solution, rinsed in fresh water, and final rinsed with distilled water SAC128 i8 Page-5 DAMES & MooRE