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3.3 GEOLOGY&LOCAL HYDROGEOLOGY <br /> The subject property's physical location was researched employing a United States Geological Survey <br /> (USGS) 7.5 Minute Topographic Quadrangle (Quad) Map relevant to the subject property. The USGS 7.5 <br /> Minute Quad Map has an approximate scale of 1 inch to 2,000 feet, and may show physical features with <br /> environmental significance such as wetlands, water bodies, roadways, mines, and buildings. The <br /> elevation of the property is approximately 18 feet above mean sea level.There is a regional downslope to the <br /> west. <br /> The site is located within the San Joaquin Valley, part of the Great Central Valley Geomorphic Province of <br /> California. The site area is underlain by Pleistocene alluvial deposits. <br /> The site is located with in the San Joaquin Valley Groundwater Basin. The site is within the Calaveras River <br /> Watershed. A property located approximately 100 feet to the south (1207 Aurora Street) reported depth to <br /> water ranging from 20 to 30 feet with a southerly flow direction (JJW Geosciences, Inc., 2009). <br /> While groundwater flow direction at the subject property cannot be confirmed without survey <br /> measurement of static groundwater level at triangulated points, it is expected to flow in the direction of <br /> surface topographical contour, or toward the wetland or nearest water body or discharge basin <br /> (percolation channel). <br /> It is important to note that groundwater flow direction can be influenced locally and regionally by the <br /> presence of local wetland features, surface topography, recharge and discharge areas, horizontal and <br /> vertical inconsistencies in the types and location of subsurface soils, and proximity to water pumping wells. <br /> Depth and gradient of the water table can change seasonally in response to variation in precipitation and <br /> recharge, and over time, in response to urban development such as storm water controls, impervious <br /> surfaces, pumping wells, cleanup activities, dewatering, seawater intrusion barrier projects near the coast, <br /> and other factors. <br /> Encon Solutions, Inc. <br /> -8- <br />