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CECCHIM, CECCHIM,AAD GIOVANNOM, FUELING ISLAND 2e0 GROUND WA TIER MOIYI[' CDR2HG PROCEDURES ES On December 12, 1994, Environmental Science & Engineering, Inc (ESE) staff measured water levels in wells SI-1, SI-2, SI-3, and UST-1 and purged and sampled well UST -1 (Figure 2) Typically the two water supply wells "large" well, and "small" well are measured each quarter, however, they were inadvertently missed this quarter ESE first measured the static water level in the wells using an electronic interface probe Then, using an electric submersible pump, approximately 55 gallons of water were purged from well UST-1 During the purging process, the pH, temperature and conductivity of the extracted ground water were measured The well purging was considered complete when a nummum of three well volumes of ground water were evacuated, the final field measurements of pH, temperature and conditions were within 15 percent of the prior measurement, and the purged water was clear The ground water sample was then collected from well UST-1 by lowering a new (precleaned) disposable polyethylene bailer in the well using new, disposable nylon cord The filled bailer was retrieved, emptied, then filled again The ground water from this bailer was then decanted into appropriate laboratory supplied glassware The containers were filled such that no headspace was present in the samples in order to avoid volatilization of the sample The filled sample containers were then labeled and placed in a cooler under ice for transport under chain of custody documentation to Curtis & Tompkins, LTD , a Califorma-certified laboratory ESE documented the sampling procedures on the attached Well Sampling Field Log (Appendix B) Purge water was placed in labeled drums and remains on site in a secure area of the site consisting of deiomzed water was provided b the ESE laboratory as a check on A trip blank co g p y ry sample handling procedures The trip blank accompanied the samples to the laboratory The ground water sample from UST-1 was analyzed at the laboratory for 0 Total Petroleum Hydrocarbons (TPH) as diesel using EPA Method 5030/8015 Modified (typically TPH as gasoline is also analyzed, however that analysis was inadvertently not requested this quarter), and Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) using EPA Method 8020 The trip blank was only analyzed for BTEX W540U14QM94 RPT 2 Ehvunn rental Science&E mpneefing, Inc