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' Soil Suitability I Nitrate Loading Study lterracon <br /> Avanti Nut Co. ■ Stockton, CA <br /> May 19, 2016 ■Terracon Project No. NA167038 <br /> Survey (Plate 6) to be composed primarily of Hollenbeck silty clay, which consist of moderately <br /> well-drained silty clay soils derived from mixed rock sources. <br /> 1.5.1 Soil Boring Locations <br /> Two soil boring was advanced on the site using a SIMCO drill rig. There was a swallow and a <br /> deep boring drilled which were used to perform the percolation tests. The location of the borings <br /> is depicted in Plate 2. <br /> 1.5.2 Soil Boring Dimensions <br /> The soil borings were advanced with 4 inch diameter auger and excavated to a depth of 3.5 feet <br /> bgs and 21 feet bgs. <br /> ` 1.5.3 Soil Lithology Observed <br /> 1 The table below presents a log of the soil boring. <br /> Table 1. <br /> Soil Boring Log. <br /> Depth Interval(ft) Soil Type Unified Soil Classification <br /> 0.0-20.0' Clay—dark brown to brown,fine, CL <br /> moist, stiff to very stiff <br /> 20.0'—25.0' Sand with Clay-brown,fine to SP <br /> medium,moist, medium dense <br /> 1.5.4 Discussion of Soil Lithology <br /> A visual inspection of the shallow soils from the test holes points to unfavorable conditions for <br /> septic disposal areas due to the cohesiveness and plasticity characteristics of clay. These <br /> characteristics do not allow good seepage or percolation. Although the deeper soils found in deep <br /> ' test hole indicate favorable conditions for a septic disposal areas due to the cohesionless and <br /> loose nature of the soil. Generally speaking, coarse-grained soil has a greater potential for <br /> percolation than fine-grained or cemented soil. <br /> 1.6 Percolation Test Information <br /> I1.6.1 Percolation Test Locations <br /> See Section 1.5.1 <br /> I <br /> Responsive a Resourceful a Reliable 7 <br />