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July 16 , 1987 -4 _ .� AGS Job No. 87048-1 <br /> Beacon Station 4675 - Lockeford; CA <br /> The calculations presented in 'Table _1 iv rd�'used to estimate the . <br /> ground water potentiometric surface across;i;the site` - The <br /> contours of this' surface :are shown on the Ground Water -_ <br /> Potentiometric Surface Map, Plate 2A. The . contours indicate a <br /> gradient of approximately -0 . 33 feet per AGO feet ( 17 . 6 feet per <br /> mile) and implies ground water, flow predominantly toward the west <br /> ( (S61W) . No dataregarding flow rates are available at this time. <br /> ANALYTICAL RESULTS <br /> Twelve soil samples retrieved from the -unsaturated zone were <br /> analyzed for total volatile hydrocarbons and hydrocarbon <br /> constituents (benzene, ethylbenzene;- •toluene, and xylenes - BETX) <br /> using gas. --chromatography with flame ionization detection - <br /> (Environmental Protection AgencyH' (EPA) 'Method 8020 ) . Four water <br /> samples were analyzed for total volatile hydrocarbons -and <br /> hydrocarbon constituents using. gas chromatography with photo- 'and <br /> flame ionization detection--(-EPA Method 602 )•.. The results of the <br /> chemical analyses are presented in Table= 2. ..and in the Appendix of <br /> this report. <br /> + . <br /> qR <br /> l <br /> 9 <br /> A - <br /> A)OPA9d GOOSASAOMS _ a. T <br />