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► Phase I Environmental Site assessment Page 6 Brookland Farms Subdivision GPE Project No. 440.1 March 19, 2004 as soils. Soils in the east Central Valley are generally deposited as alluvial fans " of the major rivers of the east valley. These soils can grossly be characterized as mixtures of well to poorly sorted sands and silt with little clay and organic material. Along the San Joaquin River and in the delta regions east of Brentwood, the low energy river and flood plain environments deposit layers of silt and clays during seasonal floods. These fine-grained sediments flocculate out of slack water as flood waters recede. In and around Farmington, soils are formed by the local erosion of the metamorphic Sierran Foothills and transport of these sediments is facilitated through seasonal run-off of the minor streams of .. the Area (Lone Tree, Little Johns and Rock Creek). These soils are formed in environments similar to the rest of the eastern Central Valley Region, i.e., alluvial fans, but tend to be less well worked in comparison to sediments that have been transported farther to the west. The USDA Soil Conservation Service has completed a soil survey of San Joaquin ` County. Based upon this survey, entitled, Soil Survey of San Joaquin County, CA, October 1992, the soils in the region can generally be classified as being a mixture of Cometa-San Joaquin-Rocklin soils and Redding-Yellowlark Soils, both moderately well drained gravelly to coarse textured soils, shallow to deep to a cemented hardpan conglomerate. The specific soils on site consist of the ` following: Alamo Clay, 0-2 percent slopes. This soil is present along the pond and drainage r. ways north of the turkey farm and running in a north/south direction connecting the two ponds on the western side of the site. This soil consists of a poorly drained, nearly level soil formed in drainage basins. The upper-most ►� approximately 60 inches consists of a gray to brown clay terminating at depth in a hardpan. ` Jahant Loam, 0-2 percent slopes 12-8 percent slopes. This is the major soil type for the northern 1/4th and western 1/3rd of the site. It consists of well-drained nearly level (0-2% slopes) or undulating (2-8% slopes) soils formed on low terraces. It is made up of a loamy surface layer to a depth of about 30 inches terminating in an 18-inch claypan. Below this is generally hardpan to a depth of at least 60 inches. San Joaquin Sandy Loam, 0-2 percent slopes 12-8 percent slopes. This is the soil �. type for the remainder of the site from about the turkey ranch extending north about 2/3rd$ of the distance across the site and east from there. These soils consist of well-drained nearly level (0-2% slopes) or undulating (2-8% slopes) soils formed on terraces. The surface of the soil consists of a loam to a depth of r 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 Modesto, CA 95356 Fax: (209)569-0295