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development of this soil has occurred also The development is a tight clay subsoil and is the <br /> result of transport and re-deposition 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 /> Deeper lithology and site geology is related to the surface soils The site is mapped by the U S <br /> ' Geological Survey as "basin 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 /> The closest surface water to the site is Duck Creek, approximately 115 of a mile to the north <br /> Mormon Slough is approximately 1 5 miles north of this site The piezometric level of <br /> groundwater has been reported to be between 70 and 80 feet below the surface at the site (San <br /> Joaquin County Flood Control and Water Conservation District, 1992 data) Municipal wells <br /> IPseal off the first 250 feet because the upper zones of saturation do not meet quality standards or <br /> do not provide sufficient quantity to be developed (Bulletin 146, California Department of Water <br /> Resources, 1967) Therefore, it is highly unlikely the fuel components at this site have affected <br /> or will affect drinking water supplies <br /> 1 <br /> Groundwater flow beneath the site is expected to be in the north-northeastern direction toward <br /> ' a groundwater pumping depression located northeast of Stockton (San Joaquin County Flood <br /> Control and Water Conservation District, Spring 1992) <br /> 1 <br /> 3.0 PROPOSED FIELD WORK - METHODS AND PROCEDURES <br /> ' A subsurface site investigation will be performed to characterize current soil and groundwater <br /> conditions beneath the site The investigation will consist of drilling and sampling three soil <br /> ' borings, and conversion of the soil borings to groundwater monitoring wells <br /> WP-0393 FNL 3 <br />