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4.0 Groundwater Sampling and Analyses <br /> On March 12, 1997, groundwater was sampled from all three on-site monitoring wells <br /> Monitoring wells MW-1, MW-2, and MW-3 were purged of at least three well volumes using a <br /> decontaminated electric downhole pump Groundwater Sampling Forms documenting well <br /> monitoring, purging, and sampling data are included an Appendix A <br /> Groundwater samples were collected from the three wells using a disposable Teflon sampling <br />' bailer Groundwater was then placed in lab-supplied sample containers, sealed, labeled, and <br /> placed in a zip-lock plastic bags The packaged samples were placed in an iced cooler and <br />' transported under chain-of-custody manifest to NET/GTEL Environmental Laboratories, Inc , a <br /> state of Califorma-certified analytical laboratory located in Concord, California All three <br /> groundwater samples were analyzed for TPH-gasoline and benzene, toluene, ethylbenzene, and <br /> xylenes (BTEX) modified by EPA Method 8015/8020 on a standard turn-around <br /> ' Analytical results of the first quarter 1997 sampling event indicate that gasoline hydrocarbons <br /> were detected in groundwater samples collected from two of the three monitoring wells Total <br /> Petroleum Hydrocarbons as gasoline was detected in the groundwater sample collected from <br /> MW-2 at 220 4g/L and from MW-3 at 260 µg/L Groundwater sampled from MW-1 did not <br /> contain detectable concentrations of gasoline hydrocarbons Benzene was not detected in any of <br /> the groundwater samples The current and historical analytical results and their detection limits <br /> ' are summarized in Table 3 and laboratory reports are included in Appendix B <br /> ' Waste water that was generated during this sampling event was placed in United Nations <br /> approved 55-gallon drums The drums were fitted with a gasket and lid, and were then sealed <br /> with a bolted sealing nng The rings were tightened so that the contents of the drum would be <br /> secure from spillage Each drum was labeled with its contents, origin and date generated The <br /> drums are currently being stored at the site pending disposition <br /> 3 <br />