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Soil Suitability/ Nitrate Loading Study Irerracon <br /> Thor Property a Stockton, CA <br /> July 19, 2018 im Terracon Project No. NA187029 <br /> poorly drained with high runoff potential and slow permeability. The USDA Soil Survey of San <br /> Joaquin County indicated permeability can be improved by ripping the hard pan layer, increasing <br /> the absorption field, backfilling leachfield trenches with sandy material, and installing long <br /> absorption lines. <br /> The site is depicted on the Geologic Map of California 2010, as within generalized quaternary <br /> Pleistocene and Holocene deposits which are comprised primarily of alluvium, lake, playa, and <br /> terrace deposits; unconsolidated and semi-consolidated. Mostly nonmarine, but includes marine <br /> deposits near the coast. <br /> 1.5.1 Soil Boring Locations <br /> Percolation test boring (P1) is located on the central eastern portion of the site approximately 62 <br /> feet north of the southeastern corner of the site and 30 feet west of the eastern fence line. <br /> Percolation test boring (P2)was advanced approximately 40 feet north of the southeastern corner <br /> of the site and 11.5 feet west of the eastern fence line. Refer to Appendix A, Exhibit 2 for the <br /> boring locations. <br /> 1.5.2 Soil Boring Dimensions <br /> Percolation test boring (P1) was advanced with a 4 inch diameter hand auger and excavated to <br /> a depth of 3.5 feet bgs. Percolation test boring (P2) was advanced using an 8 inch diameter <br /> hollow stem auger and excavated to a depth of 25.0 feet bgs. <br /> 1.5.3 Soil Lithology Observed <br /> The following table presents a log of the soil boring. <br /> Table 2. <br /> Summary of Soil Lithology. <br /> Boring Depth Interval (ft) Soil Type Unified Soil <br /> Classification <br /> Sandy Lean clay with <br /> 0.0 to 2.0 gravel, fine to medium CL <br /> P1 grained, brown <br /> 2.0 to 3.5 Lean clay, brown CL <br /> Sandy Lean clay with <br /> 0 to 2.0 gravel, fine to medium CL <br /> P2 grained, brown <br /> 2.0 to 25.0 Lean clay, brown CL <br /> Responsive ■ Resourceful ■ Reliable 8 <br />