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f F <br /> Soil Suitability& Nitrate Loading Study ' <br /> Munoz Property, Escalon, CA Page 7 <br /> Project No. 605.1 <br /> q June 18, 2009 <br /> F 5.0 SOIL PROFILE <br /> 5.1 Soil Profile <br /> Soil in his part of San generally Joaquin q g lly consist of a mixture of clay, silt, and <br /> sand with some gravel. This material is derived from the Sierran range, and <br /> clasts consist mostly of mineral grains such as <br /> quartz, <br /> and volcanic rock fragments. Clays are mostommonl feldspars,derivedfromhe <br /> breakdown of rock fragments, feldspar, and mica. The sediments are deposited <br /> by the action of rivers, in this case <br /> face and <br /> near surface deposits are generally referredmlto as the y the nModesto orethe rMeh ton <br /> Formation. <br /> According to the 1992 report, Soil. Survey of San Joaquin County, California, <br /> Fprepared by the U.S. Agriculture Department, Soil Conservation Service, the soil <br /> on the site is part of the Delhi-Veritas-Tinnin associ • "Moderately <br /> drained to somewhat excessively drained course-textured tan d mode ately course- <br /> textured sails that are deep to a cemented hardpan or are very deep; on dunes, <br /> 1 alluvial fans and low fan terraces". The specific on-site soil is characterized as <br /> Columbia fine, sandy-loam, channeled, partially drained, 0 to 2 percent slopes, <br /> frequently flooded. From depths of 12 to 60 inches, the soil 10 to 18 percent clay, <br /> and can drain 2 to 6 inches per hour. <br /> �f North American Technical Service (NATS) completed a geotechnical study of the <br /> on site soils to determine if the soil is suitable for the proposed building <br /> construction. As a part of the study, a 25-deep soil boring was advanced on the <br /> site, although not on the footprint of he leach field. A boring log in the report <br /> indicates that below 5 feet (60 inches), the soil is a mixture of sand and gravel, <br /> suggesting excellent percolation characteristics. P <br /> 5.2 Soils and Fluid Flow Characteristics <br /> Fil The soil observed on the site was generally similar to what is described in he <br /> soil survey (USDA, 1992). Based on the soil cuttings from theercola <br /> tion test <br /> boring, and the geo-tech boring, the soils to a depth of 25 feet are relatively <br /> course and are expected to exhibit adequate q permeability for fair to good <br /> percolation properties. <br /> 2937 Veneman Ave.,#B240 -Geo-Phase Environmental 209 Inc. Phone: <br /> Modesto, CA 95356 � )569-0293 <br /> Fax: (209) 569-0295 <br /> E <br /> 5 <br />