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J. H. KLEINFELDER & ASSOCIATES <br />0 <br />File No. S-1008-35 <br />May 17, 1985 <br />Page 4 <br />appears that approximately 47 feet of garbage had been placed at this lower level. The <br />landfill slopes further down toward a broad valley to the east. <br />Nearby bodies of standing water include a small pond east of the maintenance shed and <br />a small reservoir approximately one-third mile southeast of the site. The location of these <br />empoundments together with existing wells is shown on the site plan Plate H. <br />REGIONAL GEOLOGY <br />The Foothill Landfill site is located on the eastern edge of the Great Valley <br />geomorphic province, a structural trough between the Sierra Ne�ada and Coast Ranges <br />geomorphic provinces. Sediments fill the trough to depths up to approximately 30,000 feet <br />■ on the west side, thinning to the east. Sediments deposited in the Valley up until the <br />Tertiary* Period were primarily of marine origin. Nonmarine sediment deposits, including <br />volcanic flows and sedimentary sequences and terrestrial sediments, began accumulating in the <br />Tertiary Period. <br />The Foothill Landfill site is located in an area underlain by volcanic flows and <br />sediments of Miocene and Pliocene age. These deposits have since been eroded and <br />weathered to form the present day low, rolling -hill topography. <br />* See Geologic Time Scale,. Plate III. <br />C, <br />