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2.0 GROUNDWATER MONIITOIENG PROCEDURES <br /> ES <br /> On September 14, 1994, Environmental Science&Engineering, Inc (ESE) staff measured water <br /> levels in wells SI-1, SI-2, SI-3, large well ' <br /> and small well", UST-1 and purged and sampled <br /> well UST -1 (Figure 2) ESE first measured the static water level in the wells using an <br /> electronic interface probe Then, using an electric submersible pump, approximately 45 gallons <br /> of water were purged from the well During the purging process, the pH, temperature and <br /> conductivity of the extracted ground water were measured The well purging was considered <br /> complete when a minimum of three well volumes of ground water 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 <br /> was retrieved, emptied, then filled again The ground water from this bailer was then decanted <br /> into appropriate laboratory supplied glassware The containers were filled such that no <br /> heads ace was resent in the samples in order to avoid volatilization of the sample The filled <br /> P P P P <br /> sample containers were then labeled and placed in a cooler under ice for transport under chain <br /> of custody documentation to Curtis & Tompkins, LTD , a California certified laboratory ESE <br /> documented the sampling procedures on the attached Well Sampling Field log (Appendix B) <br /> Purge water was placed in labeled drums and remains on site in a secure area of the site <br /> A trip blank consisting of deionized 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 was analyzed at the 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 /> The trip blank was only analyzed for BTEX <br /> F 1692540M3gm94 rpt 2 Environmental Science&Engineering Inc <br />