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After the wells stabilized for a minimum of 24 hours, the wells were purged of stagnant water and <br /> a sample was collected from each well for laboratory analysis The wells were purged of <br />' approximately three to five well volumes of water with a submersible pump, or until pH, <br /> condut tivity, and temperature of the purged water had stabilized Water generated from the wells <br /> was temporarily stored in DOT 55-gallon drums <br /> Groundwater Sampling <br />' The static water level in each well was measured to the nearest 0 01 foot with an oil/water <br /> interface probe Approximately three well volumes of groundwater were purged from the wells <br />' using a stainless-steel electrical submersible pump The pump, cables, and hoses were steam <br /> cleaned before use in each well The wells were purged until withdrawal was of sufficient duration <br /> to result In stabilized pH, temperature, and electrical conductivity of the water, as measured by <br />' portable meters calibrated to a standard buffer and conductivity standard The wells recovered to <br /> more than 90 percent of the static water level within 5 minutes of turning off the pump The <br /> groundwater purged from the wells was temporarily stored in DOT 55-gallon drums <br />' Hydrochloric acid (or other appropriate chemical) was added to the sample vials as a preservative <br /> A sample of the formation water then was collected from the surface of the water in each of the <br />' wells with a clean Teflon bailer and slowly transferred to laboratory cleaned sample containers <br /> Water Sample Labeling and Handling <br /> Water samples were preserved in laboratory cleaned, 40-milliliter glass vials that contained <br />' concentrated hydrochloric acid as a preservative The water samples were sealed with <br /> Teflon-lined lids to eh inmate air bubbles The sample containers were labeled in the field with the <br /> site identification, monitoring well number and depth, and date, and promptly placed in iced <br />' storage for transport to the laboratory The technician initiated chain-of-custody records in the <br /> field that accompanied the samples to a laboratory certified by the state of California for the <br /> analyses requested Samples were transported to the laboratory promptly Samples in our custody <br />' were properly disposed of after their useful life had expired <br /> I <br /> SALIN\PJZ\260526051010 1 BS-97-cJb 2 A-3 Emcon <br />' 22605-101 001 Rev 0 8/4/47 <br />