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RUUff <br /> ' GUAR7ERLY GF1Dl1NGWR7FA MGNRL"NG <br /> 420 WesT Aettteman Lane.Loei.Callornia <br /> F,:3 <br /> groundwater and quarterly Aegis performed monthly measurements <br /> at ons f d <br /> subsequent to the initial we Thehfirs� and second quarterly groundwater <br /> sampling was conducted in January and April, 1991, respectively. Measurements of the <br /> depths to groundwater were changed from monthly to quarterly in June 1991. <br /> 4.0 GROUN[lWAT1GR tUIONITORINC <br /> 4.1 Groundwater <br /> On July B, 1991, Aegis personnel collected measurements 3months,ds nce Apr22, <br /> to groundwater <br /> 991, <br /> in wells MW-1. MW-2 and MW-3. Over the p <br /> groundwater levels have fallen in the three wells (Figure 3). The drop ranged from 1.99 <br /> 1991 measurements, groundwater i <br /> to 2.23 feet (Table 1). On the basis of the July t gradient of approximately <br /> estimated to flow to the southwest (Figure 4) at an average <br /> 0.001 ft/ft (0.1 percent). Figure 4 is a potentiometric surface map of the shallow water- <br /> ' bearing zone on July 8, 1991. <br /> dwater <br /> ion <br /> Previous groundwater levels are summarized dnw llhead'elevlatons,nmeasured tothe <br /> measurements were made from the reference ndard operating procedures <br /> nearest 0.01 foot, and conducted according to the Aegis sta <br /> (SOP) included as Appendix A. <br /> 4.2 Water Sam !!n and Ansl sis <br /> 1991, Aegis personnel collected groundwater samples from the three wells at <br /> On July 8, is SOP included in Appendix <br /> the site. The samples were collected according to the Aegis <br /> A,and delivered under chain-of-custody to Coast-to-Coast-Ane sampleslawelre analyzed for <br /> Obispo, California, a state-certified analytical laboratory. <br /> ylene dichloride by <br /> concentrations of: a) TPH-G, l3TEX, ethylene PA 82m (GC/MS)ide and hand b) total lead by <br /> method CAL DNS DRAFT TPH (modified) <br /> and_ EPA Method 7421. A sample was also collected from MW-2 for angry of-of-custody to Eureka <br /> by method NINO-MUG. This sample f ania ea state-certified avered under nalytcal laboratory. The <br /> Laboratories, Inc., of Sacramento, Cali <br /> analytical results are summarized in able 2ntrat ons of al reports and chain-of-custody <br /> The an TPH-G and benzene reported in <br /> forms are included in Append <br /> Table 2 are also shown on Figure 5. <br /> z <br /> 1, <br />