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rainfall, temperature, site development, and other factors. Measured groundwater levels <br />indicate a groundwater gradient of west to east at 0.002 ft/ft. <br />4.07 Clay Borrow <br />Silty to clayey material was encounter in all four test pits (TP-9 through TP-12) in the soil <br />material stockpiled at [he southeast corner of the property, and in all ten test pits (TP-13 <br />through TP-22) in the embankment between the two ponds. Test pits show that the lithology <br />of the embankment consists of a relatively thin layer of reclaimed slope backfill overlying a <br />silty to clayey overburden deposit, which overlies the coarse alluvium. Backfill ranged from <br />0.0 to 4.5 ft thick and appears to be present on the top and the west side of the embankment. <br />This backfill consists of silty clayey gravel with sand (GC-GM). Overburden existing below <br />the backfill ranged from 5 to 10 ft thick and consists of sandy lean clay (CL), lean clay with <br />sand (CL), sandy silt (ML), and silty sand (SM). <br />Test pits show that the lithology of the stockpile consists of homogenous clayey overburden <br />material. A composite sample from the four test pits indicates this material is sandy lean clay <br />(CL). <br />Based on the observed thickness of the overburden encountered in the test pits and the <br />geometry of the embankment and the stockpile, it is estimated at approximately 18,500 cubic <br />yards of silty/clayey overburden material exists from these potential borrow sources. <br />Approximately 15,400 cubic yards is estimated to be contained in the embankment and 3,100 <br />cubic yards is estimated to be contained in the stockpile. <br />11 <br />