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16 2.0 Quarterly Activities <br /> Prior to groundwater sampling on November 1, 1995, the groundwater depth in each <br /> ' accessible monitoring well was measured using a SolinsC water level meter These data <br /> were used to generate a potentiometric surface map for the site (Figure 2) Monitoring well <br /> MW-1 was dry, and MW-2 was inaccessible due to the presence of a large volume of packing <br /> crates on and around the well <br /> ' Approximately three well volumes of groundwater were purged from each sampleable well <br /> using a decontaminated bailer Groundwater parameters including pH, electrical conductivity <br /> and temperature were monitored during purging After purging the wells, groundwater <br /> samples were collected in appropriate sampling containers One quality control sample <br />' (equipment nnsate) was also collected Each sample was labeled, sealed and packed in an <br /> ice-box cooler that was maintained at a temperature of approximately 4°C using water-ice <br /> The sample coolers were delivered to McCampbell Analytical Inc (DHS Certification No <br />' 1644), located in Pacheco, California, for sample analysis Groundwater sampling <br /> information forms containing the data collected are presented in Appendix A <br /> The groundwater samples were analyzed for total petroleum hydrocarbons (TPH) as gasoline, <br /> TPH as diesel, and benzene, toluene, ethylbenzene, and xylenes (BTEX) Analysis Request <br /> and Chain-of-Custody (ARCO) records accompanied the samples at all times (Appendix B) <br /> The following methods were used for sample analysis <br /> • TPH as gasoline and TPH as diesel - modified EPA method 8015 <br /> • BTEX - EPA method 8020 <br /> The laboratory report, which includes the results for all the samples that were analyzed, is <br /> presented in Appendix C Method detection limits followed those defined to the Leaking <br />' Underground Fuel Tank Manual, dated March 1989, and the Regional Water Quality <br /> Control Board's Tri Regional Board Staff Recommendations for Preliminary Evaluation <br /> and Investigation of Underground Tank Sites, dated August 1990 <br /> MZ/04-30-96/V DB F/95-0045 If 2-1 <br />