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Q A S SOCIATES I N C . xylenes (BTEX) by EPA Method 8020, ethyl dibromide (EDB) by EPA Method 8010, and total lead by LUFT Method. Analytical results of soil samples collected from boring ASB-1 showed elevated concentrations of petroleum hydrocarbons at the fill end of the tank. Laboratory analysis of soil samples collected from ASB-2 at the opposite end of the tank recorded very low levels of contamination. The absence of significant contamination at this end of the tank indicated that soil contamination was localized at the fill end of the tank. The results of the investigation were presented in Waterwork's Underground Fuel Tank Abandonment Contaminant Assessment Report, dated July 30, 1990. On January 15, and 16, 1991, to further define the vertical extent of contamination, Waterwork personnel supervised the advancement of two additional angle soil borings (BJJS-ASB 1 and BJJS- ASB2)beneath the existing tank. Borings BJJS-ASBI and BJJS-ASB2 were advanced at 45°from vertical and terminated beneath the longitudinal centerline of the tank approximately 22.5 feet and 37 feet respectively, beneath the tank bottom. One vertical soil boring (BJJS-SB3) was also advanced to investigate the extent of the contamination. Boring BJJS-MW 1 was completed as monitoring well MWI and was installed east of the tank to provide information on water quality at the site. Petroleum hydrocarbon analytes were not present at or above method detection limits in the soil samples collected from well MWI. The soil samples collected from BJJS-ASBI and BJJS-ASB2 contained detectable concentrations of petroleum hydrocarbons. The soil samples collected from BJJS-SB3 contained very low concentrations of petroleum hydrocarbons. Groundwater was encountered during drilling at 71.5 feet bgs and well MWI was completed to a depth of 86.5 feet bgs. The well was monitored, purged, and sampled on January 17, 1991. Laboratory analyses of the groundwater samples indicated detectable concentrations of ethylbenzene and TPHg. Benzene, toluene, and xylenes were non-detectable. Groundwater was resampled for confirmation purposes on January 24, 1991, and only xylenes and TPHg were detected in the sample. Field activities are summarized in RESNA Industries, Inc.'s Problem Assessment Report, dated June 6, 1991. On July 27, 1994, RESNA personnel supervised the advancement of one soil boring which was completed as a groundwater monitoring well. The boring was advanced to 87 feet bgs, 15 feet below the water table. Soil samples were collected at 64.5 and 70 feet bgs for analysis of petroleum hydrocarbon analytes. No petroleum hydrocarbons were present at or above method detection limits in either sample. Subsequent to installation, the wellheads of well MW2 and the facility well were surveyed vertically to the site datum and the survey data were tied to well MWL Depth to water readings were collected for gradient direction and magnitude confirmation. A sample was collected from MW2 and analyzed for BTEX and TPHg. Petroleum hydrocarbon analytes were not present at or WA94304VeportslUST closure.doc 2