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2.0 GROUND WATER MOMTORIINO PROCEDURES <br /> On April 28, 1994, Environmental Science &Engineering, Inc (ESE) staff measured water levels <br /> in wells SI-1, SI-2, SI-3 and UST-1 and purged and sampled well UST -1 (Figure 2) ESE first <br /> measured the static water level in the well using an electronic interface probe Then, using a <br /> electric submersible pump, approximately 45 gallons of water were purged from the well During <br /> the purging process, pH, temperature and conductivity were measured The well purging was <br /> considered complete when a minimum of three well volumes were evacuated, the final field <br /> measurements of pH, temperature and conditions were within 15 percent of the prior <br /> measurement, and the purged water was clear <br /> The ground water sample was then collected from well UST-1 by lowering a new (precleaned) <br /> disposable polyethylene bailer in the well using new, disposable nylon cord The filled bailer was <br /> retrieved, emptied, then filled again The ground water from this bailer was then decanted into <br /> appropriate laboratory supplied glassware The containers were filled such that no headspace was <br /> present in the samples in order to avoid volatilization of the sample The filled sample containers a <br /> were then labeled and placed in a cooler under ice for transport under chain of custody <br /> documentation to Curtis & Tompkins, LTD , a California certified laboratory ESE then <br /> documented the sampling procedures on the attached Well Sampling Field log (Appendix B) <br /> Purge water was stored in labeled drums and remains on site in a secure area of the site <br /> A trip blank consisting of deiomzed water was provided by the ESE laboratory as a check on <br /> sample handling procedures The trip blank accompanied the samples to the laboratory <br /> The ground water sample from UST-1 and accompanying tip blank were analyzed at the <br /> laboratory for <br /> 0 Total Petroleum Hydrocarbons (TPH) as gasoline and diesel using EPA Methods <br /> 3550/8015 and 5030/8015 Modified, and <br /> 0 Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) using EPA Method 8020 <br /> F 1692540012gm94 rpt 2 Environmental Science&EAgmeering Inc <br />