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1 . 1 through B-4 at concentrations as high as 16,000 micrograms per liter(µg/1) in sample B-1, • and 110,000 gg/I in sample B-2, respectively. Various BTEX compounds except benzene ' were detected in all ground water samples at a maximum concentration of 1,400 fig/]zylenes, in sample B-1. The fuel oxygenating compounds MTBE and tert-Butanol were detected in sample B-4 at concentrations of 19 9g/l and 80 µg/1, 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- 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 water 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 ground water 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 GeoEnvironznental,Inc.