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' Soil Suitability&Nitrate Loading Study Page 7 St. Patrick's Church,Escalon, CA Project No. 607.1 F August 31, 2009 17ii SOIL PROFILE E 5.1 Soil Profile -,� Soils in this part of San Joaquin generally consist of a mixture of clay, silt, and sand with some gravel. This material is derived from the Sierran range, and clasts consist mostly of mineral grains such as quartz, feldspars, hornblende, j and volcanic rock fragments. Clays are most commonly derived from the breakdown of rock fragments, feldspar, and mica. The sediments are deposited by the action of rivers, in this case, primarily the Stanislaus. The surface and near surface deposits are generally referred to as the Modesto or 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 Delhi-Veritas-Tinnin association: "Moderately well drained to somewhat excessively drained course-textured and moderately course- textured soils that are deep to a cemented hardpan or are very deep; on dunes, alluvial farts and low fart terraces". The specific on-site soil is characterized as Z Manteca fine, sandy-loam, 0 to 2 percent slopes. It is a moderately well-drained soil on low fan terraces. From depths of 11 to 24 inches, the soil is a grayish brown fine sandy loam, and the interval from 24 to 35 inches is indurated 4 rated hardpan. From 35 to 74 inches is Ivariegated light gray sandy loam. The soil may also include Tannin and Veritas r— soils. Permeability is moderate. Water intake in irrigated fields is about 1.5 inches per hour. The hardpan may cause buildup of perched water and can impede septic tank drainage. North American Technical Service (NATS) completed a geotechnical stud of the � g Y on site soils to determine if the soil is suitable for the proposed building construction. As a part of the study, a 25-deep soil boring was advanced on the site of the proposed chapel. A boring log in the report indicates that below 5 feet (60 inches), the soil is a brown,-sandy silt that should be suitable for a septic sewage system. 5.2 Soils and Fluid Flow Characteristics The soil observed on the site was generally similar to what is described in the soil survey (USDA, 1992). Based on the soil cuttings from the percolation test boring, and the geo-tech boring, the soils to a depth of 25 feet are course enough to allow adequate percolation properties. I' F�I 2937 Veneman Ave.,#13240 Geo-Phase Environmental Inc. Phone: (209) 569-0293 Modesto, CA 95356 Fax: (209) 569-0295 Fj I E