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' Soil Suitability Study Page 6 Sandhu Farms,260 E. Linne Rd.,Tracy CA Project No. 692.1 September 18,2014 ' 5.0 SOIL PROFILE 5.1 Soil Profile Soils in this part of San Joaquin County generally consist of a mixture of clay, silt, and sand with some gravel. The material west of the San Joaquin River is derived principally from the Coast range, and clasts consist mostly of mineral grains such as quartz, feldspars, hornblende, and rock fragments. Clays are most commonly derived from the breakdown of rock fragments, feldspar, and mica in sand and silt grains. The sediments are deposited by the ' action of rivers and streams, in this case, primarily the San Joaquin. The near surface deposits are generally referred to as the Mehrton Formation. According to the 1992 report, Soil Survey of San Joaquin County, California, prepared by the U.S. Agriculture Department, Soil Conservation Service, the soil on the site is part of the Capay association; moderately well drained fine textured soils of the San Joaquin River flood plain. The specific on-site soil is almost all a type known as Capay clay, wet, 0-2% slopes. This is deep, moderately well drained brownish clay soil is about 24 inches thick and overlies ' brown a silty clay loam to a depth of at least 60 inches (5 feet). It is generally poorly to moderately permeable, and may contain calcareous hard pan layers. 5.2 Soils and Fluid Flow Characteristics As a part of this study, a group of soil borings were installed to a depth of 42 inches for the purpose of conducting percolation tests. Very little hard pan was noted in the borings. The ' actual soil encountered in the borings was found to be silt and clayey silt. The percolation test results (Section 6.0) confirm that the silt content is sufficiently high as to offer a reasonable level of permeability. 1 ' 2937 Veneman Ave.,#13240 Geo-Phase Environmental Inc. Phone: (209)569-0293 Modesto,CA 95356 Fax: (209)569-0295