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DOM- <br /> s.a <br /> OUASTERLY GROUNDWATER NiONITO ONG RFPOfiT <br /> w :20 West Kerteman lane.Loc.CaUorn-a - <br /> • Aegis performed monthly measurements of depths to groundwater and quarterly sampling <br /> subsequent to the initial well installations. The firs , pod, andhid <br /> groundwater sampling was conducted in January, April, second, <br /> I quarterlyrespectively. <br /> Measurements of the depths to groundwater were changed from monthly to quarterly in <br /> ,Tune 1991. <br /> 4.0 GROODWATER MONITORING <br /> 4.1 Groundwater <br /> On October 17, 1991, Aegis personnel collected measurements of the depths to <br /> MW-2, and MW-3. Over the past 3 months, since <br /> groundwater in wells MW-1, <br /> July 8, 1991, groundwater levels have fallen in the three wells (Figure be <br /> The drop <br /> ranged from 3.27 to 2.31 feet (Table 1). On the basis of the October 17, 1991, <br /> measurements, groundwater is estimated ft flow <br /> 4t sea poten southwest <br /> (Fig ure surface map <br /> average gradient of approximately 0.001 ft/ Figure <br /> of the shallow water-bearing zone on October 17, 1991. <br /> dwater <br /> ion <br /> Previous groundwater levels are summarizedeinenced Tabead ele lot ar°s,nmeasuredetotthe <br /> measurements were made from the e <br /> nearest 0.01 foot, and conducted according to the Aegis standard operating procedure <br /> - (SOP) included in Appendix A. <br /> 4.2 Water Sampling and Analysis <br /> e three <br /> On October 17, 1991, Aegis personnel collected o dingwater to the Aegis samples SOP nclluded in <br /> wells at the site. The samples were collected according <br /> custody to National Environmental Testing, Inc. <br /> Appendix A.and delivered under chain-of- <br /> (NET) of Santa Rasa, California, astate-ca5 state-certifiedanalytical EPA Method 5030 (GC,samples <br /> F1D)�b} <br /> re <br /> analyzed for concentrations of: a)TPH, gasoline, <br /> BTEX by EPA Method 8020 (GC, Liquid); c} ethylene dibrornide (EDB) and ethylene <br /> dichloride by EPA Method 624 (GCMS, Liquid); and d) total lead by et d l,/i{N��MUG, <br /> MW-2 was analyzed for concentrations of total and fecal coliform,by <br /> by Eureka Laboratories, Inc., of are summarized inTable2. The analytical ifornia, a state-certified <br /> d <br /> laboratory. The analytical resultsgasoline, <br /> chain-of-custody forms are included in Appendix B. Concentrations of TPH, as <br /> and benzene reported in Table 2 are also shown on Figure 5. <br /> h'I 29-073E.RPT <br /> } <br />