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Soil Suitability @.Nitrate Loading Study Page 6 Proposed Stoma Winery, 17521 Davis Rd,Lodi CA Project No. 670.113 Julv 22,2013 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. This material is derived from the Sierran range,and clasts consist mostly of mineral grains such as quartz, feldspars, hornblende, 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 Mokelumne. The surface and 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 Tokay-Acampo association: `Moderately well drained and well drained moderately course- textured soils that are moderately deep to a cemented hardpan or are very de low fan terraces". The specific on-site soil is characterized as Tokay fine, sandy-loam, to 2 slopes. This is very deep, well-drained, nearly level soil on low tan rertat Vis. o depth to about 19 inches, it is grayish brown fine sandy loam. The subsoil is grayish brown and pale brown fine sandy loam to about 26 inches. From 26 to 60 inches, is pale brown fine sandy loam. North American Technical Service (HATS) completed a geotechnical study of the on site soils (HATS, 2013)to determine if the soil is suitable for the proposed building construction (Appendix Q. As a part of the study, a 24-foot-deep (P-1) and a 15.5-foot-deep (P-2) soil boring were advanced on the site. The boring logs in the report generally confirm the observations of the soil survey described above. The material encountered is described as brown silty-sand from the surface to 4 feet. 1n P-2 tan gray sand was encountered from 4 to 12 feet, and tan sandy silt was encountered between 4 and 24 feet in P-2 and between 12 and 15.5 feet in P-2. 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 borings, and the geo-tech borings, the soils to a depth of 24 feet are silty and are expected to exhibit only fair permeability across much of the interval. The apparent exception to this is the sandy layer from 4 to 12 feet in boring P-2. 2937 Veneman Ave.,OB240 Geo-Phase Environmental lnc Phone: (209)569-0293 Modesto,CA 95356 Fax: (209)569-0295