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' radius of the site consists of gently rolling hills ranging from elevation of 200 feet mean <br /> sea level (MSL) along the Delta-Mendota Canal to 600 feet MSL along the base of the <br /> ' Coast Range. The elevation of the landfill site ranges from approximately 250 to 300 <br /> feet. <br /> ' Corral Hollow Creek is an ephemeral stream and drains s the area Just south of the <br /> ' landfill. <br /> ' 2.3 GEOLOGY <br /> 2.3.1 Geologic Map <br /> A site plan showing surficial geologic units is shown in Figure 2. Geologic cross <br /> ' sections showing lithology and stratigraphic relationships are presented in Drawings 2 <br /> and 3. <br /> ' 2.3.2 Regional Geology <br /> The Corral Hollow Sanitary Landfill lies in the west-central part of the Central Valley of <br /> ' California, a topographic and structural trough bounded on the east by the Sierra <br /> Nevada block and on the west by the folded and faulted Coast Ranges. These <br /> ' topographic features have contributed up to 30,000 feet of valley sediments since the <br /> Jurassic period(135 to 181 million years ago). <br /> The San roughly JoaquinY P g Y Valley, which comprises the southern two-thirds of the <br /> ' Central Valley of California, is divided into five geomorphic units: (1) Coast Range, <br /> (2) dissected upland, (3) low alluvial plains and fans, (4) river flood plains and <br /> channels, and(5) overflow lands and lake bottoms. <br /> The Coast Range unit consists of the consequent ridges and foothills of the Coast <br /> ' Range parallel to the axis of the San Joaquin Valley. <br /> ' The dissected uplands unit consists of deeply eroded old stream terraces in the form of <br /> STL 9390314 5 Rev. 0 06/30/88 <br /> ' Mon Associates <br />