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MITIGATION: <br /> No mitigation is deemed necessary. <br /> TOPOGRAPHY <br /> EXISTING: <br /> The site is nearly flat; varying in elevation approximately one or <br /> two feet. The average elevation of the site is around 4 feet above mean <br /> sea level (U.S.G.S. datum) , or approximately 90 feet based on City of <br /> Stockton datum. The site drains generally toward the north and west; <br /> although, there are a few local depressions where ponding could occur <br /> after heavy rainfall (See hydrology discussion). <br /> IMPACTS: <br /> The project would require only minimal surface leveling for <br /> building pad preparations and road construction. <br /> MITIGATION: <br /> No mitigation is deemed necessary. <br /> ' SOIL <br /> EXISTING: <br /> A geotechnical investigation of the site was conducted by <br /> Geomechanics, Inc. in August, 1979 [5]. The soils were described as <br /> clay-silt soil up to several feet thick which is underlain by silt, <br /> sandy silt or sand. The clay-silt soil is typically brown, dry, <br /> moderately stiff to stiff and moderately to highly expansive when <br /> wetted. Erosion hazard ranges from none to slight [3]. <br /> The SCS describes these soils as slow permeability, weakly cemented <br /> substratum, possible perched water tables, need for drainage and <br /> possibility of flooding during heavy rainfall (Appendix C-40) . <br /> IMPACTS: <br /> Implementation of the project would result in overlaying 85± <br /> percent of the soil with impervious surfaces, taking the area out of any <br /> agricultural use. However, as mentioned in the discussion of land use <br /> impacts, the site is within an area already reserved for urban <br /> expansion. <br /> Due to the flat terrain and erosion resistant soils, erosion caused <br /> by surface runoff would be minimal . Temporary wind erosion during the <br /> construction phase may also occur, but it is not expected to be <br /> significant. <br /> 30 <br />