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and to the northwest/north, generally similar to previous sampling events. Groundwater elevations were <br /> highest at MW-1 (Partner, Data Gaps Assessment Work Plan, 2018). A Site Plan depicting existing/historic <br /> sample locations is provided as Figure 2. <br /> Based on borings advanced during previous investigations, the underlying subsurface consists <br /> predominantly of brown, firm, clay, and silt with varying percentages of fine to medium sand from the ground <br /> surface to approximately 10 feet bgs. Particle size analysis indicated that the percentage of sand ranged <br /> from 20.7 to 44.0 percent. At 10 feet bgs, the subsurface consists predominantly of brown fine-grained sand <br /> and silty sand. From 15 feet bgs to approximately 20 feet bgs, light brown, medium stiff, fine grained clays <br /> and silts have been encountered that appear to be laterally continuous across the Site. <br /> 3989.0001510VR Revised Data Gap Investigation Work Plan I ROUX 15 <br />