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Cecchtnt, Cecchint, and Geovannom Fueling Island <br /> extraction pump Well development and purging was completed as demonstrated by the <br /> recovery of clear ground water after 40 gallons had been removed from UST-5 <br /> 2.4 WeRR Read Survey <br /> A survey of the top of the casing elevation of the new well UST-5 was made by FSE <br /> personnel The survey was tied into the previous survey of wells UST-2, UST-3, and <br /> UST-4 relative to the City of Stockton Benchmark No. 191 made by Frame Surveying & <br /> Mapping, of Davis, California (ESE, 1995b) The top of casing elevation for UST-5 was <br /> measured to be 28 62 feet relative to mean sea level <br /> 3.0 Ground Wates- Mcun loin ung Procedures <br /> res <br /> 4n June 20 1996 Environmental Science & Engineering, Inc ESE staff measured <br /> g g (ESE) <br /> water levels in wells UST-1 through UST-5 and the "small well" and purged and sampled <br /> wells UST-2 through UST-5 <br /> ESE first measured the static water level in the wells using an electronic interface probe <br /> Then, using the AES extraction pump, 20 to 40 gallons of water were purged from wells <br /> UST-2 through UST-5. During the purging process, the pH, temperature, and <br /> conductivity of the extracted ground water were measured The well purging was <br /> considered complete when a minimum of three well volumes of ground water were <br /> evacuated, the final field measurements of pH, temperature, and conditions were within <br /> 15 percent of the prior measurement, and the purged water appeared clear <br /> A ground water sample was then collected from the wells by lowering a new (precleaned) <br /> disposable polyethylene bailer in the well using new, disposable nylon cord The filled <br /> bailer was retrieved, emptied, then filled again The ground water from this bailer was <br /> then decanted into appropriate laboratory-supplied glassware The containers were filled <br /> such that no head space was present in the samples in order to avoid volatilization of the <br /> sample The filled sample containers were then labeled and placed in a cooler under ice <br /> for transport under chain-of-custody documentation to McCampbell Analytical, a <br /> California-certified laboratory ESE documented the sampling procedures on the attached <br /> Well Sampling Field Log (Appendix B) Purge water was placed in labeled drums and <br /> remains on site in a secure area of the site <br /> i <br /> F 169254000QM%RPT 4 Etvnrontnental Science&Engtneenng, Inc <br />