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i 1 2.3 Groundwater Sampling Proper sample collection and handling are essential to assure the quality of the data obtained ' from the given sample Each groundwater sample therefore was collected using a new sterile disposable bailer The sampled water was placed in laboratory prepared sterile 40 milliliter glass, one liter plastic, and one quart amber containers The sample containers were filled ' with water to the top to expel air space and were sealed with teflon-lined caps Water sample containers were labeled with the name of the sampler, the date, the fob number, the preservative, and an identifying number The samples were then transported to Sierra ' Laboratories, in Anaheim, California Full chain of custody protocol was followed during sample handling and delivery ' In addition to samples collected from each well, one duplicate sample was collected from MW-2-P and analyzed for BTEX for quality control purposes ' 2.4 Groundwater Analyses ' Analyses of the groundwater samples were performed by a California certified laboratory in accordance with state guidelines and EPA protocol The samples were analyzed for TPH as gasoline and diesel, BTEX, and total lead using EPA methods 8015, 8020 and 7421, respectively 3.0 FINDINGS 3.1 Results of Groundwater Laboratory Analyses ' Detectable levels of petroleum hydrocarbons as gasoline were reported in all three i of the V, levels of petroleum ; groundwater samples collected an September 15, 1993 No detectablep ' hydrocarbons as diesel were reported In September of 1992 only MW-2-P and MW-3-P were noted as having detectable concentrations of gasoline in the groundwater Groundwater laboratory results for September, 1992 and September 1993 are summarized in Table I in ' Appendix B Certified laboratory reports and chain of custody documents are included as Appendix C 3.2 Groundwater Conditions Most recent groundwater data collected at the site indicates groundwater occurring at depths ranging from 75 04 feet to 74 20 feet below ground surface (bgs) Groundwater is flowing east northeast with a hydraulic gradient of approximately 0 0036 or about 0 36 feet per 100 ' feet Several graphic presentations of the groundwater flow beneath the site are presented on Figures 3 through 6 in Appendix A The field data collected and subsequent flow direction calculations suggests that groundwater ' 5007 J3 3