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Site Background Information PremDor • Page 2 of 5 1 PREVIOUS SITE ASSESSMENTS ' On 15 and 16 October 2002 three soil boringsB1 thou B3 were though a advanced to a depth of 35 feet below surface grade (bsg), utilizing a van-mounted Geoprobe 5400 direct-push probing unit ' equipped with 1 25-mch probing rods,for the collection and analysis of soil and`grab'groundwater samples After probing to a depth of 25 feet bsg, ground water was found to be at approximately 22 ' feet bsg Soil boring B 1 was advanced in the northwest comer of the former UST excavation Soil boring B2 was advanced approximately five feet east of the former UST excavation and soil boring B3 was advanced approximately ten feet southwest of the former UST excavation tA total of six soil samples were analyzed for petroleum hydrocarbon products TPH-g was detected in soil samples collected from all three borings at a maximum concentration of 22,000 milligrams ' per kilogram(mg/kg),in sample B2-15 TPH-d was detected in soil samples collected from bonngs B1 and B2 at a maximum concentration of 7,500 mg/kg in sample B2-15 BTEX compounds were detected in soil samples collected from all three bonngs at maximum concentrations of 1 I mg/kg, ' 460 mg/kg, 320 mg/kg and 1830 mg/kg, respectively, in sample B2-15 Lead was detected by EPA Method 6010B in one soil sample collected in boring B2 at a concentration of 59 mg/kg, in sample B2-15 No additional target analytes were detected at or above laboratory detection limits in the soil samples analyzed A grab ground water sample was collected from each of the three bonngs on 15 and 16 October 2002 and were analyzed for petroleum hydrocarbon products TPH-g was detected in ground water samples collected from each boring at a maximum concentration of 170,000µg/1 in boring B2 TPH- d was detected in ground water samples collected from bonngs B1 and B2 at a maximum concentration of 23,000µg/1 inboring B2 BTEX compounds were detected in groundwater samples collected from all three bonngs at maximum concentrations of 550 pg/1(B3),23,000µg/1(B 1),6,100 I 11g/1(B1) and 33,000 gg/1(B1), respectively 1,2-DCA was detected in ground water samples collected from all three borings at a maximum concentration of 54 µg/1 in sample B3 EDB was detected in ground water samples collected from all three bonngs at a maximum concentration of 190 µg/1 in sample B2 No additional target analytes were detected at or above laboratory detection limits in the ground water samples analyzed I On 09, 10 and 16 October 2003, four soil borings (MW1 through MW3 and B4)were advanced at the site A CME-75HT truck mounted drill ng or a CME-75 limited access drill ng were utilizing to advance 8 25-inch diameter hollow-stem augers to the total depth of each boring Pilot bonngs MWl, MW2 and MW3 were completed as ground water monitoring wells using 2-mch diameter PVC casing,with 0 020-inch slotted screen installed from approximately 14 feet to 34 feet bsg The filter pack(No 2/12 Lonestar sand)was installed from approximately 12 feet to 34 feet bsg, and a I nominal 2-foot bentonite chip plug was then installed above the filter pack and hydrated The wells were then grouted to near the surface with portland cement,and water-tight,traffic-rated well boxes rwere installed over the wells Advanced GeoEnvm mental,Inc I