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Site Background Information: Bob's Muffler Page 3 of 5 tertiary-butyl ether (MTBE), were not detected above the elevated reporting limit. • TPH-g and TPH-mo were detected in ground water samples collected from borings B-1 through B-4 at concentrations as high as 16,000 micrograms per liter(pg/l) in sample B-1, and 110,000 µg11 in sample B-2. Toluene, ethylbenzene, and xylenes were detected in all ground water samples at a maximum concentration of 1,400 µg/1 (xylenes) in sample B-1. The fuel oxygenating compounds MTBE and tertiary butanol were detected in sample B-4 at concentrations of 19µg11 and 80 Vg/l,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 bsg for the 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 benzene,toluene,ethylbenzene,and xylenes 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 the 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 bsg; MW-6 was advanced to 50 feet bsg. • TPH-g was detected in soil sample MWS-30 and MW9-20 at concentrations of 15 mg/kg and 130 mg/kg, respectively. Total petroleum hydrocarbons quantified as diesel (TPH-d) were detected in soil sample MW6-35 and MW9-20 at concentrations of 1.2 mg/kg and 150 mg/kg, respectively, and TPH-mo was detected in sample MW9-20 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 MW6-35,MW 8-30,and MW9-20 at maximum concentrations of 0.093 mg/kg, 0.83 mg/kg,and 0.7 mg/kg,respectively.In addition,MTBE was detected at a concentration of 0.0075 mg/kg in soil sample MW9-25. 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 three soil samples were submitted for analysis. ' No analytes were detected at or above laboratory reporting limits in the soil samples analyzed. Advanced GeoEnviron mental,Inc.