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w <br /> SOIL BORINGS &WELL INSTALLATION <br /> Apex personnel supervised the drilling of two soil borings(VEW-1 and AS-1) on September 30, <br /> 1994, at the locations indicated on Figure 2. The borings were drilled by Woodward Drilling <br /> Company, of Rio Vista, California, to depths of 14 and 11 feet below grade for VEW-1 and AS-1 <br /> respectfully. The drilling was conducted according to the Apex standard operating procedures <br /> (SOP)included as Attachment 1. <br /> Well construction details for VEW-1 are included on the boring logs(Attachment 2). <br /> GROUNDWATER MONITORING <br /> Groundwater Levels <br /> On October 28, 1994, Apex personnel collected groundwater-level measurements from all six <br /> wells. All groundwater elevations were measured to the nearest 0.01 foot, referenced to the <br /> surveyed top-of-casing elevations and conducted according to the Apex standard operating <br /> procedures(SOP)included as Attachment 1. Liquid-level measurements collected since January <br /> 1993 are summarized in Table 1. Figure 3 is a potentiometric surface map of the shallow water- <br /> bearing zone on October 28, 1994. No floating liquid hydrocarbons(FLH)were observed to be <br /> present in any of the wells. <br /> Groundwater Sampling and Analysis <br /> On October 28, 1994, Apex personnel collected groundwater samples from the six wells. All <br /> samples were collected according to the Apex SOP included in Attachment 1. The samples were <br /> submitted,under chain-of-custody, to Sparger Technology of Sacramento, California, a state- <br /> certified analytical laboratory. Analytical results since January 1992 for total petroleum <br /> hydrocarbons(TPH), as gasoline and diesel, and benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX) are summarized in Table 2. The laboratory analytical reports and chain-of-custody form <br /> are included in Attachment 3. <br /> 2 <br />