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Soil Suitability /Nitrate Loading Study Irerracon <br />Thornton Road Trailer Parking Facility ■ Lodi, California <br />December 15, 2021 ■ Terracon Project No. NA217079 <br />1.5 Soil Profile and Geologic Information <br />The site is depicted on the Geologic Map of California website, as within generalized quaternary <br />Pleistocene and Holocene deposits which are comprised primarily of unconsolidated and semi - <br />consolidated alluvium, lake, playa, and terrace deposits. <br />Terracon reviewed the United States Department of Agriculture (USDA) Natural Resources <br />Conservation Service (NRCS) Web Soil Survey and USDA Soil Survey of San Joaquin County <br />(1992) for information regarding soil properties. Based on information obtained from the USDA <br />sources, site soils consist of Devries sandy loam and Acampo sandy loam. <br />Devries sandy loam is located on the northwestern, southeastern and southwestern portions of <br />the site and consists of drained soils with 0 to 2 percent slopes. Parent material consists of <br />alluvium derived from mixed rock sources. Typical soil profiles consist of 0 to 27 inches sandy <br />loam, 27 to 47 inches cemented sandy loam, 47 to 62 inches sandy loam. <br />Acampo sandy loam is located on the northeastern portion of the site and consists of 0 to 2 <br />percent slopes. Parent material consists of alluvium derived from granite. Typical soil profiles <br />consist of 0 to 47 inches sandy loam and 47 to 60 inches cemented soil. <br />For urban development, the main limitations of Devries and Acampo sandy loam is depth to <br />hardpan. Ripping the hardpan improves permeability and thus also improves the suitability of <br />the soil for septic tank absorption fields. <br />1.5.1 Soil Boring Locations <br />Based on information provided by the client, the proposed leach field will be located west of the <br />proposed Trailer Parking Facility (Exhibit 2). Three percolation test borings P1, P2, P3 were <br />advanced in the vicinity of the proposed leach field. Below are the approximate coordinates for <br />the tests. <br />Percolation Test <br />Latitude <br />Longitude <br />P1 <br />38.1195512 <br />-121.3941694 <br />P2 <br />38.119684 <br />-121.3940366 <br />P3 <br />38.1198054 <br />-121.3939396 <br />1.5.2 Soil Boring Dimensions <br />Three borings were advanced using a hand auger with a 4 -inch diameter auger to 3 (P1), 3.5 <br />(P2), and 6.3 (P3) feet bgs. <br />Responsive ■ Resourceful ■ Reliable 8 <br />