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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 /> 1.5 General Geologic Information and Soil Profile <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. <br /> Based on a review the United States Department of Agriculture (USDA) Natural Resources <br /> Conservation Service (NRCS)Web Soil Survey, site soils consist of Jacktone clay and Stockton <br /> clay soils. Refer to Section 1.6 and 2.1 for further discussion. <br /> Based on a review of GeoTracker and information contained in a Site Closure Request—Speedy <br /> Food Mart, dated July 2, 2010 prepared by Ground Zero Analysis Inc., site soils consisted <br /> primarily of silt and clay (0 to 30 feet bgs)with a minor sand layer at 15 feet bgs, silty sand (30 to <br /> 43 feet bgs), clay and silt (43 to 55 feet bgs), sand (55 to 63 feet bgs), and clay and silt with <br /> multiple sand layers (63 to 300 feet bgs). <br /> 1.5.1 Soil Boring Locations <br /> According to Mr. Le, the septic system location for the proposed development had not been <br /> determined. Terracon placed the percolation test boring (61-3.5')approximately 150 feet east of <br /> the western site boundary and approximately 115 feet north of Foppiano Lane. A deep boring <br /> (62-26) was additionally excavated approximately four feet west of boring B1 to a depth of 25 <br /> feet bgs. Refer to Appendix A, Exhibit 2 for the approximate boring locations. <br /> 1.5.2 Soil Boring Dimensions <br /> Soil boring B1 was advanced with a 4 inch diameter hand auger to a depth of 3.5 feet bgs. Boring <br /> B2 was advanced with a drill rig equipped with an 8 inch diameter continuous flight auger and <br /> advanced to a depth of 25.0 feet bgs. Refer to Appendix A, Exhibit 2 for the boring locations. <br /> 1.5.3 Soil Lithology Observed <br /> The following table presents a log of the soil boring. <br /> Table 5. <br /> Summary of Soil Lithology. <br /> Boring Depth Interval (ft) Soil Type Unified Soil <br /> Classification <br /> 131-3.5' 0-3.5 Lean clay, brown black, weak CL <br /> cementation <br /> 62-25' 0-9.0 Lean clay, brown black, weak CL <br /> cementation <br /> Responsive ■ Resourceful ■ Reliable 11 <br />