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4 <br /> G ' KtEINFELDEQ <br /> i <br /> 4 RESULTS <br /> 4.1 SOIL-GAS SURVEY <br /> wA Soil-gas and ground water samples were extracted and analyzed for TPH and BTEX. <br /> Samples were analyzed on site by Tracer Research personnel in their mobile laboratory. <br /> Petroleum hydrocarbon constituents were detected in six of the 15 samples as shown on <br /> i Table 3. The highest concentrations were detected in water samples from location M <br /> (520,000 ug/1 TPH, 400,000 ug/1 benzene, 12,000 ug/l toluene,36,000 ug/l ethylbenzene <br /> � a <br /> and 20,000 ug/l xylene). Significantly lower concentrations were detected at E,K,L and N. <br /> These locations are all near the tank excavation. Plate 4 depicts the probable lateral extent <br /> ` of hydrocarbons as detected in ground water collected during the soil-gas survey. <br /> ` 4.2 SOIL ASSESSMENT <br /> s <br /> The bottom soil sample from each of the three soil borings was submitted to Enseco <br /> Analytical Laboratory for chemical analyses. The samples were analyzed for TPH <br /> purgeable by GC-FID (modified EPA method 8015); BTEX by EPA Method 8020; and <br /> G.f <br /> total organic lead by California Analytical Laboratories/Enseco of West Sacramento, <br /> California. The laboratory is certified by the state of California for the above mentioned <br /> � F <br /> { <br /> analyses. <br /> f ' No petroleum hydrocarbon constituents were detected in the soil samples, with the <br /> ` exception of 5.5 ug/kg of toluene in the sample from B-3. This sample was collected <br /> 3 approximately five feet south of soil-gas survey location M and is the only sample in which <br /> field screening indicated the presence of more than 1 ppmv volatile organics. Analytical <br /> results are summarized on Table 3. <br /> Pa l <br /> 4.3 GROUNDWATER ASSESSMENT <br /> One water sample from each well was submitted to California Analytical <br /> Laboratories/Enseco for chemical analyses. The samples were analyzed for IT <br /> purgeable by GC-FID;B'1'EX by EPA Method 602;and total organic lead. Because MW-1 <br /> ----._.._�...- '.- <br /> -------is-less than 50 feet-from a-sewer line,-San Joaquin-County required that a-ground water-------.. --------.__.....__.._._.--------------.--- <br /> w, <br /> F15-90.101 6 <br /> Copyright 1990 Kteinfetder, Inc. <br />