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7kwdwe118Rd10 <br /> • 3.0 PHYSICAL CHARACTERISTICS OF THE STUDY AREA <br /> 3.1 Surface Features <br /> The study area is generally flat, with an average surface elevation of approximately 12 feet above <br /> mean sea level. No surface water features or wetlands exist within the area, although the <br /> Stockton Ship Channel abuts the recreational area immediately south of Areas 10 and 11. <br /> Structures that previously existed on Areas 10, 11, and 20 have been demolished. Single-story <br /> metal,wood frame, and brick structures are present at Areas 15, 16, and 21. <br /> 3.2 Meteorology <br /> The study area is in the San Joaquin Valley Air Basin. Temperature inversions frequently occur <br /> in the valley due to the mountain ranges that border the basin to the east(Sierra Nevada) and <br /> west (Coast Ranges). While inversions can occur year round,they are more frequent in the late <br /> • summer and fall months. Seasonal average daily temperatures range from approximately 55 to <br /> 85 degrees Fahrenheit. Rainfall averages 10 to 15 inches per year. Average wind velocity is <br /> 350 cm/sec (7.8 miles per hour). <br /> 3.3 Surface Water Hydrology <br /> No surface water bodies exist within the study area. The Stockton Ship Channel abuts the <br /> recreational area immediately south of Areas 10 and 11. Drainage is generally to storm drains <br /> that feed to the City of Stockton storm drain system. <br /> 3.4 Regional Geology <br /> The study area lies within the Great Valley Geomorphic province of California, in the eastern <br /> portion of the Sacramento/San Joaquin Delta. The geology is characterized by Pleistocene and <br /> Recent alluvial deposits consisting of heterogeneous sequences of sands and gravels originating <br /> from active stream channels, and from silts and clays originating from over-bank and marsh <br /> • depositional environments(USGS Bulletin 190, 1966). <br /> 23 <br /> 25970309.DGD 24 August 2000 <br />