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r� Coyner Property Page 3 <br /> Tank Closure Report <br /> Project 103.5 <br /> August 21,1996 <br /> each of the three tank pits and from the three spoil piles. All soil samples were collected in <br /> +� brass sample tubes The pits were then backfilled with clean soil. <br /> 3.2 Soil Sampling and Testing <br /> The soil samples were submitted to FGL Environmental for laboratory testing. Each sample <br /> was tested for the presence of Total Petroleum Hydrocarbons as gasoline and/or as diesel <br /> (TPH-G & TPH-D) using EPA method 3510/8015m and for benzene, toluene, ethylbenzene <br /> and xylene (BTEX) using EPA method 8020. The samples were also tested for the presence <br /> of total lead using method 7420 and for EDB using method 8010. The sample results and <br /> method detect limits are summarized in the following table. <br /> Ethyl Total TPH TPH Total <br /> Sample I.D. Benzene Toluene Benzene Xylenes Diesel Gasoline Lead <br /> ijgfkg pglkgk lk rngikg k m lk <br /> Tank IS NO NO NO NO 10 N/A N/A <br /> Tank 1N ND NO NO ND ND NIA NIA <br /> Tank 2S ND NO NO 11 NIA ND ND <br /> Tank 2N ND I ND ND ND NO NO ND <br /> Tank 3W ND ND ND ND 9.8 NIA N/A <br /> Tank 3E No ND ND ND ND N/A N/A <br /> Spoil Pile 1A ND ND ND ND ND NO ND <br /> Spoil Pile 18 ND NO ND ND 3.1 NO NO <br /> $ ll Pile 2 ND ND ND NO NO NIA N/A <br /> Piping ND I NO NO ND ND ND NO <br /> Detection Limits 5 pgAk 5 /k 5 Ik 5 lk 1 maLkg 1 mglkg mg/kg4 m9/k9 <br /> 3.3 Site Geology and Hydrogeolog_y <br /> The USDA Soils Conservation Service Soil Survey of San Joaquin County California, <br /> October 1992, classifies the soil as Jacktone Clay. The material is typically a very dark gray <br /> to dark gray clay which becomes calcareous at about 20 to 40 inches below the surface. <br /> Permeability is fairly poor. Deeper portions of the unit may grade to a yellowish loam. <br /> V <br /> Based on the map Lines of Equal Elevation of Water in Water Welly, Unconfined Aguifer, <br /> �. Spring 1994, by the San Joaquin County Flood Control and Water Conservation District, <br /> groundwater is estimated to lie at a depth of about 80 feet or less below grade and flow in a <br /> nearly horizontal plane. Information from groundwater monitoring wells at nearby sites which <br /> +„ were examined as a part of this investigation. The LUST site at Gilley's Trucking which lies <br /> nearby on the west side of Newton Road, has been investigated and groundwater monitoring <br /> wells have been installed. In December 1995 the depth to groundwater was found to be 63 <br />.. feet below ground surface. The gradient at Gilley's was found to have a weak southerly <br /> flow gradient. <br /> 19 <br /> Phase One Environmental Inc. <br /> ar 2937 Veneman Ave., 48240 Modesto,CA 95356 <br /> (209) 569-0293 <br />