Laserfiche WebLink
Soil Suitability/ Nitrate Loading Study <br /> Ernst Property ■ Tracy, CA Irerracon <br /> February 21, 2019 revised April 9, 2019 ■ Terracon Project No. NA197000 <br /> 1.4.5 Groundwater Sample Handling <br /> Not applicable. Refer to Section 1.4.3. <br /> 1.5 Soil Profile and Geologic Information <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 unconsolidated and semi- <br /> consolidated alluvium, lake, playa, and terrace deposits. <br /> Terracon reviewed the United States Department of Agriculture (USDA) Natural Resources <br /> Conversation Service (NRCS) Web Soil Surrey and USDA Soil Survey of San Joaquin County <br /> (1992) for information regarding soil properties. Based on information obtained from the USDA <br /> sources, the site consists of Capay clay soils with 0 to 1 percent slopes. Parent material is clayey <br /> alluvium derived from sedimentary rock. Typical soil profiles consist of 0 to 60 inches clay. Capay <br /> clay soils are moderately well drained with high runoff potential, slow permeability, and high shrink <br /> swell potential. For sites with septic systems, permeability can be improved by increasing the size <br /> of the absorption field, backfilling leachfield trenches with sandy material, and installing long <br /> absorption lines. <br /> 1 .5.1 Soil Boring Locations <br /> Percolation test boring (131) is located near the northeastern portion of the site approximately 26 <br /> feet south of the northern fence line and 65 feet west of the eastern fence line. Soil boring (B2) <br /> was located approximately 10 feet west of boring B1. Refer to Appendix A, Exhibit 2 for the boring <br /> locations. <br /> 1.5.2 Soil Boring Dimensions <br /> Soil borings B1 and B2 were advanced with a 4 inch diameter hand auger. Boring B1 was <br /> excavated to a depth of 3.0 feet bgs and boring B2 was excavated until refusal at a depth of <br /> approximately 3.58 feet bgs. <br /> 1.5.3 Soil Lithology Observed <br /> The following table presents a log of the soil boring(s). Boring logs are included in Appendix D. <br /> Table 4. <br /> Summary of Soil Lithology. <br /> Boring Depth Interval (feet) Soil Type Unified Soil <br /> Classification <br /> B1 0.0 to 2.5 Lean clay,fine grained, CL <br /> brown <br /> Responsive■ Resourceful ■ Reliable 8 <br />