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Results of a groundwater investigation conducted by Roy F Weston to October 19$$ indicated no diesel fuel components detectable in soil or water samples collected during ' installation and sampling of three monitoring wells These wells - MW-1, MW-2, and MW-3 - are located approximately 100 feet northwest, and 75 feet east and 100 feet south, respectively, of the former tanks emplacement (Figure 2). The monitoring wells were installed to a depth of approximately 65 feet ' In October 1992, Remediation Services, Inc (RSI) drilled and sampled two soil borings, one boring in the former tank excavation (B-1), and one boring approximately ten feet north of ' the excavation (the latter was completed as groundwater monitoring well MW-4) The results of the soil samples analyzed indicate that petroleum hydrocarbons were detected to a depth of 70 feet in the soil boring B-1 (13 ppm TPH as diesel) and to a depth of 60 feet in the soil boring MW-4 (2100 ppm TPH as diesel) None of the chlorinated organic compounds ' previously identified were detected in either boring Additional soil investigation conducted by RSI in February of 1993 included four soil borings (B-101 through B-104) drilled to depths of 74 feet below the ground surface (Figure 2) TPH as diesel was detected at a maximum concentration of 11 ppm at a depth of 55 feet In December of 1993, RSI installed two additional groundwater monitoring wells (MW-5 and MW-6) Monitoring wells MW-5 and MW-6 are screened between 70 and 90 feet below the ground surface, and together with MW-4 are currently being monitored and sampled on a quarterly basis for TPH as gasoline, TPH as diesel and BTEX, No TPH or BTEX components were detected during the most recent report groundwater sampling event (July 1994) Analytical results from the October 1994 sampling event are pending ' 1.3 Scope of Work The scope of work addressed in this Plan includes excavation and disposal of soil from the former UST excavation and surrounding area In addition, a vapor observation point will be installed within the excavation These activities will be conducted as a source reduction ' measure, in an effort to mitigate the potential for migration of the petroleum hydrocarbons in the soil to the underlying groundwater. Groundwater sampling at the site will continue on a 1 quarterly basis for a one year period using the existing well array Groundwater will be sampled and analyzed for TPH as gasoline, TPH as diesel and BTEX i MZ/11-29-94/UST/940201 nbr 2