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r 2.4 Quarterly Activities Prior togroundwater sampling on August 7, 1995, the groundwater depth in each accessible monitoring well (Figure 2) was measured using a SolinsCm water level meter Monitoring r well MW-2 was inaccessible due to the presence of a large volume of packing crates on and around the well An anomalous groundwater level was initially measured in wells MW-3 and ' MW-4 In order to verify the groundwater levels at the site, all the accessible wells were remeasured using a Sohnsf' water level meter on August 9, 1995 These data were used to generate a potentiometnc surface map for the site (Figure 2). Approximately three well volumes of groundwater were purged from wells MW-5 and MW-6 using a decontaminated two-inch diameter submersible pump and clean, disposable hose Monitoring well MW-4 was purged using a decontaminated bailer Groundwater parameters including pH, electrical conductivity and temperature were monitored during purging After purging the wells, groundwater samples were collected in appropriate sampling containers One quality control sample (equipment Ansate) was also collected. Each sample was labeled, sealed and packed in an ice-box cooler that was maintained at a temperature of approximately 4'C using water-ice The sample coolers were delivered to McCampbell Analytical Inc (DHS Certification No 1644), located in Pacheco, California, for sample analysis Groundwater sampling forms containing the data collected are presented in Appendix A The groundwater samples were analyzed for total petroleum hydrocarbons (TPH) as gasoline, TPH as diesel, and benzene, toluene, ethylbenzene, and xylenes (BTEX) Analysis Request and Chain-of-Custody (ARCO) records accompanied the samples at all times (Appendix B) 1 The following methods were used for sample analysis • TPH as gasoline and TPH as diesel - modified EPA method 8015 • BTEX - EPA method 8020 The Certified laboratory report, which includes the results for all the samples that were P analyzed, is presented in Appendix C Method detection limits followed those defined in the Leaking Underground Fuel Tank Manual, dated March 1989, and the Regional Water MZJ09-20-95/VDBF/95-0027 NBR 2-1 1