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-5- 2P2/386/61-1 <br /> of the present channel--which at that time had a levee only on the <br /> south side . Subsequently, Bear Creek has been diverted to the channe; <br /> on the south property line with levees constructed on the north side <br /> C <br /> of this channel and a diversion dam constructed on Pixley Slough . <br /> Geologic Setting <br /> a <br /> The site is mapped (USGS MF 1401, 1982) as being underlain by <br /> partly consolidated , locally cemented silt and sand sediments of the <br /> Modesto formation of Pleistocene age--derived primarily from glacial <br /> outwash. A portion of the east part of the site is mapped as Recent <br /> Calaveras River alluvium. Peat or organic soil depsits on the <br /> .�r <br /> Bishop Tract are in be less than 5-ft thick---generally <br /> thinning from west to east. Surficial organic matter has likely been <br /> t .` substantially oxidized by cultivation. Deposits of loose-soft mineral <br /> +soils and more than 5-ft of peat are expected to be very limited in <br /> ateral extent to occurrences in existing and historic channels. <br /> At greater depth the area is underlain by progressively older <br /> avers of sediment (USGS MF 1761, 1985) with crystalline basement <br /> Wicks present at more than 1000m depth . The sediments generally dip <br /> ery gently to the west with slight unconformities marking different <br /> enerations of deposition. <br /> k <br /> AK" <br /> amu,. <br /> I <br />