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MEM� <br /> M_ <br /> Mr. Steven Sasson <br /> September 13, 1995 (9547-0571) <br /> Soil beneath the site consists primarily of unconsolidated silts and silty sands. Ground <br /> water is estimated to be approximately 65 feet below grade (bg). <br /> Tank And Piping Removal <br /> During December 1994, Fugro witnessed the removal of four single-walled steel USTs <br /> (two 10,000-gallon and two 6,000-gallon) and associated product lines from the subject site. <br /> Based on initial laboratory results of samples collected from below the former USTs and product <br /> lines, an additional 150 cubic yards of soil were removed. Laboratory analyses of soil sample <br /> TP-1 collected from the overexcavation at 21 feet bg (Figure 2) detected total petroleum <br /> hydrocarbons as gasoline (TPHg) at 1,000 parts per million (ppm). Total xylenes at 0.024 ppm <br /> were detected in soil sample EN-2NSW (Figure 2) collected at 17 feet bg. No petroleum <br /> hydrocarbons were detected the in soil samples collected from beneath the former dispenser <br /> islands or product lines. Approximately 1,100 cubic yards of soil were excavated during tank <br /> removal activities. The soil was disposed of at Forward Landfill in Manteca, California and at <br /> Sacramento County Landfill in Sacramento, California. Complete results of the UST removal <br /> and station upgrades were documented in Fugro's Underground Storage Tank Closure Report, <br /> dated April 19, 1995. <br /> SCOPE OF WORK <br /> Fugro proposes to advance three soil borings using the GeoProbe system in the areas of <br /> investigation shown on Figure 2. The GeoProbe employs a mobile hydraulically-driven soil <br /> sample collection system which advances 1-1/4-inch-diameter push rods to a desired depth. An <br /> undisturbed soil sample is then collected using a 1-1/16-inch-diameter split spoon. This process <br /> generates minor soil cuttings which will be temporarily stored on site on and under plastic <br /> sheeting pending waste characterization. Following is a detailed scope of work: <br /> 1) Advance one boring near soil sample EN-2NSW collected on December 8, 1994, <br /> 2) Advance one boring southeast and southwest of the existing UST basin. <br /> 95470571.AWP -2- <br />