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2.4 Topography, Geology, Hydrology <br /> The site is situated on level terrain. The soils at the property have been mapped by the <br /> ' U S.D A. Soil Conservation Service as Stockton Clay (adobe) Stockton clay is a fine-textured, <br /> dark gray to black clay, deposited by quiescent or slow moving water. The parent material was <br /> of mixed origin, but primarily igneous rock. According to the survey, some in-place <br /> development of this soil has also occurred. The development is a tight clay subsoil and is the <br /> result of transport and redeposition of very fine particles from the top of the soil profile to the <br /> ' subsoil, resulting in a high colloidal clay content and impervious structure in the subsoil. <br /> t Deeper hthology and site geology is related to the surface soils. The site is mapped by the U.S. <br /> Geological Survey as basun deposits. Basin deposits have hthologic profiles dominated by <br /> ' fine-textured materials. However, intercalating layers of coarser textured materials are common <br /> and usually capable of freely releasing water Municipal water wells drilled in the general area <br /> ' penetrate through alternating clays and sands to a depth of 250 feet or more before intentionally <br /> extracting water. <br /> IP <br /> The closest surface water to the site is Duck Creek, 1/3 of a mile to the southeast Mormon <br /> ' Slough is approximately 1 mile to the north The pnezometnc level of groundwater has been <br /> reported to be between 45 and 55 feet below the surface at the site (San Joaquin County Flood <br /> ' Control and Water Conservation District, 1989 data). Municipal wells seal off the first 250 feet <br /> because the upper zones of saturation do not meet quality standards or do not provide sufficient <br /> ' quantity to be developed, (Bulletin 146, California Department of Water Resources, 1967). <br /> Therefore, it is highly unlikely the fuel components at this site have affected or will affect <br /> drinking water supplies. <br /> 2.5 Proximity of Private, Municipal, and Irrigation Wells <br /> There is one supply well on the subject property. All water for the site, including sinks and <br /> ' restrooms in the office, is supplied by the well The location of the on-site well is shown on ` <br /> Figure 2. Well locations within a 112 mile radius of the site were requested from the <br /> Department of Water Resources. A well, identified as O1NO7E17M, is located approximately <br /> ' IOISRI22 NX 3 <br />