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1 <br /> 3 0 PHYSICAL SITE SETTING <br /> 31 Geomorphic Description <br /> The subject site area is situated on the eastern margin of the San Joaquin/Sacramento <br /> River delta The prominent geologic structure in the vicinity of the site is the Diablo <br /> Mountain Range (part of the Coast Ranges province) which borders the west side of the <br /> Great Valley, and Sierra Nevada province which borders the east <br /> 32 Geologic Setting <br /> The subject site is located in the San Joaquin Valley, the southern portion of the Great <br /> Valley geomorphic province of northern California The Great Valley is generally <br /> ' characterized as an asymmetrical structural trough into which large quantities of marine, <br /> alluvial fan and stream sediments have been deposited <br /> 33 H dro eolo isSettin <br /> The regional surface water drainage in the area is largely influenced by the San <br /> Joaquin River and trends generally towards the southwest to the Mormon Slough and <br /> Stockton Deep Water Channel Groundwater is estimated to be at a depth ranging from 16 <br /> to 25 feet below ground surface Groundwater flow in the area is generally toward the <br /> southwest Hillside runoff, aquifer pumping or other factors may influence groundwater <br /> levels Seasonal variations should also be anticipated <br /> PHASEI 3 3-1 95-1104801 <br />