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Soil Suitability/Nitrate Loading Study Irerracon <br /> Vacant Commercial Property■ Stockton, California <br /> December 7, 2018 ■ Terracon Project No. NA187056 <br /> Boring Depth Interval (ft) Soil Type Unified Soil <br /> Classification <br /> Lean clay with sand, fine to <br /> 9.0- 13.5 medium grained, brown, weak CL <br /> cementation <br /> Silty sand,fine to medium <br /> 13.5- 15.0 grained, brown, weak SM <br /> cementation <br /> 15.0- 19.0 Lean clay, brown, weak CL <br /> cementation <br /> Sandy silt, fine to medium <br /> 20.0-25.0 grained, brown, weak ML <br /> cementation <br /> 1.5.4 Discussion of Soil Lithology <br /> A visual inspection of the shallow soils from the test hole points to unfavorable conditions for <br /> shallow septic disposal due to the clay soils and cemented soils present which do not allow for <br /> sufficient seepage or percolation. In general, uncemented coarse-grained soil has a greater <br /> potential for percolation than fine-grained or cemented soil. <br /> 1.6 Percolation Test Information <br /> 1.6.1 Percolation Test Locations <br /> Percolation tests were conducted near the southern central portion of the site. Refer to Section <br /> 1.5.1 and Appendix A, Exhibit 2. <br /> 1.6.2 Number of Percolation Tests <br /> A shallow percolation test 131 was conducted on October 25, 2018 at a depth of 3.5 feet bgs. A <br /> deep percolation test B2 was conducted on November 1, 2018 at a depth of 25.0 feet bgs. <br /> 1.6.3 Boring Preparation and Presaturation <br /> The shallow soil boring 61 was excavated to a depth of 3.5 feet bgs on October 24, 2018 using a <br /> 4.0-inch diameter hand auger. Approximately six inches of"pea gravel"was placed in the bottom <br /> of the open boring. A 2.0-inch diameter PVC pipe with perforations towards the bottom was <br /> installed on top of the gravel. Pre-saturation consisted of a water column approximately 1 foot <br /> over gravel on the same day. <br /> Responsive ■ Resourceful ■ Reliable 12 <br />