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March 24, 1997 <br /> Page 2 <br /> 1976 No information was available regarding the removal of other underground <br /> facilities at the site <br /> The former USTs consisted of three gasoline fuel (5,000-gallon supreme, 2,000-gallon <br /> mid-grade, and 5,000-gallon regular) tanks of single wall steel construction located on <br /> the western portion of the site and one 550-gallon used oil tank of single wall steel <br /> construction located northeast of the former station building <br /> PREVIOUS INVESTIGATIONS <br /> In February 1995, The MARK Group, Inc (MARK) conducted a Phase I Environmental <br /> Site Assessment(ESA) The ESA included a field reconnaissance of the site and <br /> adjacent properties, literature reviews regarding historical land-use and hydrogeology, <br /> interviews, and review of governmental environmental databases Based on the results <br /> of the ESA, further environmental investigation was recommended (MARK, February <br /> 1995) <br /> In April 1995, MARK conducted a preliminary subsurface investigation which included <br /> the drilling of six exploratory bonngs The six borings included one adjacent to the <br /> former waste oil tank, one at the location of the former hydraulic hoist, one at the <br /> location of the former pump island, one adjacent to the location of the former product <br /> lines, and two at the location of the former gasoline USTs Total petroleum <br /> hydrocarbons calculated as gasoline (TPH-g), and benzene,toluene, ethylbenzene, and <br /> xylenes (BTEX compounds) were detected at 3 feet below ground surface (bgs) within <br /> the farmer UST excavation backfill TPH-g and benzene were detected at <br /> concentrations of 170 parts per million (ppm) and 0 051 ppm, respectively No TPH-g <br /> or BTEX compounds were detected in any of the other samples collected (MARK, April <br /> 1995) <br /> Subsurface materials reported during drilling included near-surface clayey fill and <br /> clayey fill with concrete debris within the former UST excavation backfill, and native <br /> soil consisting of clay Groundwater was not encountered and based on regional <br /> information groundwater flow is estimated to be to the southwest at a depth in excess of <br /> 50 feet (MARK, April 1995) <br /> SCOPE OF WORK <br /> The scope of work for this investigation was proposed to confirm the presence and <br /> evaluate the extent of hydrocarbons in soil In light of these findings, the proposed <br /> installation of a soil boring through the southeast corner of the former UST pit is <br /> outlined in the Proposed Scope of Work Section below <br /> Fhe specific scope of work is discussed below <br /> Geophysical Survey A geophysical survey, which included the usc. <br /> .' of ground penetrating radar (GPR) and magnetometer technologies, <br /> «20039I n/Sl ri-PULL DOC <br />