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' had occurred in the vicinity of the former gasoline tank, and that further investigation was <br /> iwarranted. <br /> On August 24 and 25, 1994, Remcor installed an additional seven soil borings and three <br /> monitoring wells to further define the lateral extent of soil and ground water <br /> contamination identified in the initial phase of work. <br /> On March 8, 1996, AGS installed an additional three ground water monitoring wells to <br /> 1 1 further define the lateral and vertical extent of contamination. Monitoring well MW-7 <br /> was installed in the upgradient direction to the southeast of the former UST pit. <br /> ' Monitoring well MW-8 was installed west of the former UST pit to assess ground water <br /> quality in that direction. These two wells were installed to a depth of 27 feet and 25 feet <br /> below grade, respectively. <br /> ' Monitoring well MW-9 was installed adjacent to the previously installed well MW-6 to <br /> determine the vertical extent of contamination. This well was installed to a depth of 45 <br /> ' feet below grade and sealed with bentonite between the depths of 38 feet and 28 feet. <br /> 1.3 Geology <br /> ' The <br /> subsurface geology of the site was determined by logging soil samples collected at <br /> lievarious intervals during the initial and supplemental site investigations. <br /> Dark brown silty clay dominates the stratigraphy from within one foot of the surface to <br /> ' <br /> the bottom of the borings. In general, fine sand was found within the silty Y cla unit near <br /> the bottom of the borings. The moisture content increased with depth and reached <br /> saturation between 12 and 16 feet below grade. <br /> 1.4 Hydrology <br /> ' Groundwater at the site is contained in a semi-confined or unconfined aquifer 10 to 15 <br /> feet below grade. Historically, groundwater at the site demonstrates a shallow gradient <br /> ' which slopes to the northwest. <br /> 1 <br /> American Geological Services, Inc. <br /> CA95DE-029 <br />