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hydrostratigraphy of the site is summarized below from information presented in the <br /> SWAT report (depth intervals shown in bold are generalized). <br /> 0 to 10 feet: Surficial Clays. Native silts and clays are present throughout the <br /> former pond area from the surface to a depth of 5 to 13 feet (average approximately <br /> 10 feet). These clay and silt deposits are normally unsaturated. In the area of the <br /> ponds, these deposits were excavated and reworked when the ponds were built and <br /> surrounded by berms. <br /> 10 to 35 feet: Shallow Groundwater. Sands with various amounts of silt are present <br /> beneath the surficial clays to a depth of up to approximately 35 feet throughout the <br /> area of the ponds. The water table is within this interval, approximately 10 to 15 feet <br /> deep, and fluctuates seasonally. The sands contain thin and discontinuous interbeds <br /> of silt and clay. <br /> The overall thickness of the sands in this interval varies, and an Isopach map <br /> depicting the thickness of the sands in this interval is shown in Figure 3. This map <br /> was prepared using the boring log information presented in the 1990 SWAT report. <br /> The pattern of sand thickness in Figure 3 suggests the presence of a northwest- <br /> trending paleo-channel parallel to the existing Whiskey Slough. The amber-colored <br /> area on the map represents the estimated extent of the main paleo-channel. Boring <br /> log data indicate that the sands are 25- to 30-feet thick along the axis of the paleo- <br /> channel and less than 10-feet thick(or not present) along the flanks. This <br /> Z:IPROP-PIN 1999%1524-p1del Ak1n%-1524-Ld. <br /> 5 <br />