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Soil Suitability/ Nitrate Loading Study Addendum Irerracon <br /> Arriaga Property ■ Stockton, California <br /> August 31, 2020 ■ Terracon Project No. NA207046 <br /> The southern half of the site consists of Hollenbeck silty clay soils with 0 to 2 percent slopes. <br /> Typical soil profiles consist of 0 to 10 inches silty clay, 10 to 37 inches clay, 37 to 42 inches silty <br /> clay loam, and 42 to 60 inches cemented soils. Soils are moderately well drained with high runoff <br /> potential, slow permeability, and high shrink swell potential. For sites with septic systems, the <br /> slow permeability can be improved by increasing the size of the absorption field, backfilling <br /> leachfield trenches with sandy material, and installing long absorption lines. <br /> 1.5.1 Soil Boring Locations <br /> Based on a review of the site plan, the proposed leach field will be located on the southern half <br /> of the parcel, south of the proposed mobile home. Two shallow percolation test borings (B2 and <br /> B4) were placed near the anticipated leach field. Refer to Appendix A, Exhibit 2 for the <br /> approximate boring locations. Refer to Appendix A, Exhibit 2 for the approximate boring locations. <br /> Refer to Table 5 below for boring GPS coordinates. <br /> 1.5.2 Soil Boring Dimensions <br /> Soil borings were advanced with a 4-inch diameter hand auger. Borings B2 and B4 were <br /> advanced to 3.5 feet bgs and boring B3 was advanced 5.0 feet bgs or auger refusal. <br /> 1.5.3 Soil Lithology Observed <br /> The following table presents a log of the soil boring(s). <br /> Table 5. <br /> Summary of Soil Lithology <br /> Boring Depth Interval Soil Type Unified Soil Latitude Longitude <br /> (ft) Classification <br /> Clay, hard with <br /> B1 0-0.5 cobbles. Refusal at CL 37.90862 -121.16301 <br /> 0.5 feet bgs <br /> 0-1.0 Clay, hard with CL <br /> cobbles, brown, dry <br /> B2 37.90829 -121.163 <br /> 1 -3.5 Clay, hard, black, CL <br /> dense, moist <br /> Clay, hard with <br /> 0-1.0 cobbles, brown, CL <br /> dense, dry <br /> B3 1.0-2.0 Sand with clay,dark SW-SC <br /> Soil Profile brown,dry, loose 37.90859 -121.16302 <br /> Sandy clay,dark <br /> 2.0-5.0 brown, dry,dense, CL <br /> clumps. Refusal at 5.0 <br /> feet <br /> Responsive ■ Resourceful ■ Reliable 9 <br />