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' through B4 at concentrations as high as 16,000 micrograms per liter(µg/1) in sample B-1, . . and 110,000 µg/1 in sample B-2, respectively. Various BTEX compounds except benzene ' were detected in all ground water samples at amaximum concentration of 1,400 pg/l zylenes, in sample B-1. The fuel oxygenating compounds MTBE and tert-Butanol were detected in sample B-4 at concentrations of 19 µg/1 and 80 µg11, respectively. The lead scavenger 1, 2- ' dichloroethane (1,2-DCA) was detected in sample B-4 at 0.59 ug/l. On 09 and 10 December 1999, five soil.borings were advanced at the site to a depth of 35 feet below ' surface grade (bsg) for installation of monitoring wells MW-1 through MW-5. • TPH-g and TPH-mo were detected in the soil sample collected at 20 feet bsg in pilot boring ' MW-4 at concentrations of 160 mg/kg and 4.7 mg/kg, respectively; TPH-mo was detected in borings MW-1 at 25 feet bsg and MW-5 at 20 feet bsg at concentrations of 5.7 mg/kg,and 7.5 mg/kg, respectively. MTBE and BTEX compounds were not detected above laboratory ' reporting limits in any of the soil samples collected and analyzed. ' On 30 and 31 October 2001,four soil borings were advanced at the site for installation of monitoring wells MW-6 and MW-8 through MW-10. MW-8 through MW-10 were advanced to a depth of 35 feet below surface grade (bsg); MW-5 Was advanced to 50 feet bsg. ' TPH-g was detected in soil sample MW-8-30 and MW-9-20 at concentrations of 15 and 130 milligrams per kilograms(mg/kg),-respectively,TPH-d was detected in soil sample MW-6- M 35 and MW-9-20 at concentrations of 1.2 and 150 mg/kg, respectively, and TPH-mo was detected in sample MW-9-20 at 10 mg/kg; no petroleum hydrocarbon compounds were detected in any of the soil samples analyzed from boring MW-10. The BTEX compounds ' toluene, ethylbenzene and xylenes were detected in soil samples MW-6-35, MW-8-30 and MW-9-20 at maximum concentrations of 0.093 mg/kg, 0.83 mg/kg and 0.7 mg/kg, respectively, in the sample from MW-9-20. In -addition, MTBE was" detected at a ' concentration of 0.0075 mg/kg in soil sample MW-9-25. On 25 February 2002, one additional ground dater monitoring well (MW-7) was installed on-site ' to a depth of 35 feet bsg..A total of 3 soil samples were submitted for analytical analysis. • No analytes were detected at or above laboratory reporting limits in the soil samples ' analyzed. ' On 05 January 2004,two geoprobe soil borings(B5 and B6)were advanced off-site to a depth of 47 feet bsg. A total of nine soil samples and four grab groundwater samples were submitted for analytical analysis. ' No analytes were detected at or above laboratory reporting limits in the soil samples- analyzed. ' Four soil samples, one from the upper sand layer, two from the middle silt and clay layer and one from the lower sand layer were collected from soil boring B5 and analyzed for geotechnical properties.The samples B5-10 and B5-40 were described as brown sand an brown sand with silt and Advanced GeoEnvi ron mental,Inc.