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4.0 Groundwater Sampling and Analyses f On June 20, 1997, groundwater was sampled from all three on-site monitoring wells Monitoring wells MW-1, MW-2, and MW-3 were purged of at least three well volumes using a clean PVC bailer Groundwater Sampling Forms documenting well monitoring,purging, and sampling data are included in Appendix A ' Groundwater samples were collected from the three wells using a new disposable polyethylene sampling bailer for each well Groundwater was then placed in lab-supplied sample containers, ' sealed, labeled, and placed in a zip-lock plastic bags The packaged samples were placed in an iced cooler and transported under chair-of-custody manifest to NEVGTEL Environmental ' Laboratories, Inc , a state of California-certified analytical laboratory located in Concord, California All three groundwater samples were analyzed for TPH-gasoline and benzene, ' toluene, ethylbenzene, and xylenes (BTEX)modified by EPA Method 8015/8020 on a standard turn-around Analytical results of the second quarter 1997 sampling event indicate that gasoline hydrocarbons were detected in groundwater samples collected from two of the three monitoring wells Total Petroleum Hydrocarbons as gasoline was detected in the groundwater sample collected from MW-2 at 200µg/L and from MW-3 at 250,ug/L Groundwater sampled from MW-1 did not ' contain detectable concentrations of gasoline hydrocarbons BTEX constituents were detected only in MW-3 Benzene, ethylbenzene, and xylenes were detected in groundwater obtained from MW-3 at concentrations of 2 9, 18, and 9 6µg/1 respectively The current and historical analytical results and their detection limits are summarized in Table 3 and laboratory reports are ' included in Appendix B ' Waste water that was generated during this sampling event was placed in United Nations approved 55-gallon drums The drums were fitted with a gasket and lid, and were then sealed with a bolted sealing rung The rings were tightened so that the contents of the drum would be secure from spillage Each drum was labeled with its contents, origin and date generated The drmns are currently being stored at the site pending disposition. 3