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1 <br /> had occurred in the vicinity of the former gasoline tank, and that further investigation was <br /> warranted <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 /> 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 subsurface geology of the site was determined by logging soil samples collected at <br /> various 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 /> the bottom of the borings In general, fine sand was found within the silty clay 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 <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 /> An aquifer test will be perfomed on monitoring well MW-9 to determine the degree of <br /> communication between the well's screened interval and the shallow ground water zone <br /> 1 <br /> American Geological Services,Inc <br /> CA95DE-029 <br /> 4 <br />