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Work Plan, BP Facility No 11 191 November 10, 1994 an underground storage tank (UST) complex Locations of the site facilities are shown on the Site Plan (Figure 2) PREVIOUS WORK Based on information supplied by BP, we understand that RESNA Industries (RESNA) drilled four exploratory soil borings (B-1 through B-4) at the subject site to December 1992 to evaluate whether fuel hydrocarbons were present ,n soil and/or groundwater at selected locations at the site Locations of the soil borings are shown on figure 2 Benzene, toluene, ethylbenzene, and xylenes (BTEX) were detected at concentrations up to 0 0880 parts per million (ppm) in soil samples from boring B-1 , B-2, and B-4 at depths up to 45 feet below ground surface (bgs) Groundwater was not encountered in these borings A sensitive receptor survey identified one domestic and two municipal water supply wells within 0 5-mile radius of the subject site These data were reported in RESNA report no 17050 01 , Preliminary Site Assessment, dated February 11 , 1993 In October 1993, RESNA drilled one additional exploratory soil boring (B-5) near boring B-4 to confirm the presence of residual hydrocarbons detected in the soil sample from boring B-4 at 45 feet bgs Benzene, toluene, ethylbenzene, and xylenes were detected in the sample from boring B-5 at 46 5 feet bgs, and benzene was detected in the sample from 51 5 feet bgs Benzene concentrations were 0 15 and 0 0093 ppm, respectively Residual petroleum hydrocarbons were not detected in the soil sample from boring B-5 at 60 5 feet bgs Groundwater in the site vicinity is reported to be approximately 70 feet bgs, based on groundwater monitoring wells within two miles of the subject site These data were reported in RESNA report no 11 17shoo/123013 01 , Limited Subsurface Investigation, dated February 8, 1994 PROPOSED SCOPE OF WORK To assess the lateral extent of residual petroleum hydrocarbons in the vicinity of boring B-4 and B-5, GSI proposes to drill three exploratory borings at the locations shown on Figure 2 Because of the low concentrations of BTEX compounds detected in boring B-4 at 45 feet bgs and boring B-5 at 50.5 feet bgs, and the lack of detectable hydrocarbon compounds in the soil sample from boring B-5 at 60 5 feet bgs, the proposed soil borings will be drilled to a total depth of 50 feet bgs If field evidence of hydrocarbons is present at this depth, the depth of the boring will be extended If field evidence of residual hydrocarbons is present in any boring, an additional boring will be drilled further i Report No 4300 701 1 2 GeoStrategies Inc.