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I ' Site Background Information PremDor Page 3 of 5 A total of 13 soil samples were analyzed for petroleum hydrocarbon products TPH-g was detected ' in soil samples collected from borings B4 and MW2 at concentrations of 12 milligrams per kilogram (mg/kg)(B4-25)and 18 mg/kg(MW2-35) Benzene,toluene,ethylbenzene and total xylenes were detected in soil samples collected from borings B4 and MW2 at maximum concentrations of 0 044 Img/kg (MW2-35), 0 27 mg/kg (MW2-35), 0 15 mg/kg (B4-25) and 0 35 mg/kg (MW2-35), respectively Total lead was detected in all samples analyzed from bonngs MWlthrough MW3 at concentrations ranging from 6 3 mg/kg (MW2-35) to 15 mg/kg (MW1-35), total lead was not detected above the laboratory detection level or 5 0 mg/kg in the samples analyzed from B4 No additional analytes were detected at or above laboratory detection limits in the samples analyzed rOne grab ground water sample (B4-H20)collected from boring B4 at an approximate depth of 53 feet bsg and analyzed for petroleum hydrocarbon products TPH-g and TPH-d were detected in the I ground water sample collected from boring B4 at a concentration of 14,000 micrograms per liter (µg/1)and 11,000µg/1,respectively Benzene,toluene,ethylbenzene and total xylenes were detected in the ground water sample collected from boring B4 at concentrations of 11 µg/1,260µg/1,430 µg/l and 2,650µg/1,respectively The lead scavenger 1,2-DCA was detected in the ground water sample collected from boring B4 at concentration of 2 2 µg/1 No additional analytes were detected at or above laboratory detection limits in the sample analyzed STRATIGRAPHY Generally, gray, orange-brown to dark-brown, dry, silt with sand and gravel (fill matenal),was encountered from surface grade to approximately 6 feet bsg Light yellow-orange-brown to dark ' brown, damp to moist, clays, clayey silts and clayey sands were encountered from approximately 6 feet bsg to 21 feet bsg Brown,blue-gray to dark-gray,saturated,fine to coarse sand and silty sand was encountered from approximately 21 feet to 29 feet bsg,but to almost 35 feet bsg in the area of MW2 Gray to blue-gray,moist to saturated clay with medium to high toughness and plasticity was encountered from approximately 29 feet bsg to 36 feet bsg Blue-gray to green-gray, saturated, silt was encountered from approximately 36 feet bsg to 49 feet bsg in soil boring B4 Green-grey Isaturated, fine sand was encountered from approximately 49 feet bsg to the extent of the boring in soil boring B4 CONCEPTUAL SITE MODEL Based on the data collected to date from soil borings and monitoring well installations, AGE has developed a conceptual site model (CSM) for the release, migration and distribution of the Icontammants In the subsurface as described below The soil profile beneath the site is generally composed of silt with sand and gravel (fill material) Advanced GeoEnvuonmental,Inc I