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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 <br />that <br />approximately <br />47 feet <br />of garbage had <br />been <br />placed at this lower level.. The <br />_ landfill <br />slopes <br />further down <br />toward a <br />broad valley to <br />the <br />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 GEALOGY <br />The Foothill Landfill site is located on the eastern edge of the Great Valley <br />d geomorphic province, a structural trough between the Sierra Nevada 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 />