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Ellviroumenlal site Iv,et smeut <br /> V "Ol"Ifnba 1/0nse 11(;1rdunranwavd) Prnfeti. 111vun[viaa House, Cullf<arnin <br /> B-1-1. Background <br /> The Development is located in the rural areas of San Joaquin County, California. The <br /> lands of the Development previously consisted of agricultural properties with few <br /> _ farmhouses and related structures. The land was primarily used for irrigated <br /> agricultural crops. Currently, the proposed Mountain House Master Plan includes <br /> residential, commercial and limited industrial properties as well as schools, parks and <br /> recreational facility. <br /> B-1-2. Topography <br /> The original topography of the Site consisted of moderately flat surface. Currently, the <br /> original Site surface is completely disturbed as the Site is being graded. The original <br /> — elevation of the Site, indicated by the review of the U.S. Geologic Survey (USGS) maps, <br /> ranged from approximately 51 to 64 feet above mean sea level (MSL); however, it <br /> appears that the finished elevation may be slightly higher. The original topography of the <br /> Site sloped slightly to the northeast. Two manmade ditches are located in within the Site. <br /> They are designated as "interim ditch until M/H residential is completed." Currently, <br /> large diameter conduits are in the field and appears it is planned to be placed in the <br /> ditched. A stretch of Mountain House Creek is located just south of the Site; however, <br /> the Creek bed is currently dry. <br /> B-1-3. Geology and Hydrogeologv <br /> According to geotechnical reports, the Site and the surrounding areas are situated on the <br /> alluvial flatlands of the Great Valley Region. The Pleistocene age alluvium was laid <br /> down in geologically recent times, and was formed by recent local stream and lake <br /> deposits and sediments. The alluvial soils consist of various mixtures of interbedded <br /> gravel, sand, silt and clay. The thickness of the alluvium is estimated to exceed 150 feet. <br /> No information regarding the groundwater characteristics underneath the Site was <br /> available to IMFC for review. However, it may be surmised that the groundwater may <br /> be affected by the flow at the Mountain House Creek. <br /> 5 <br /> ENOC <br />