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Soil Suitability/Nitrate Loading Study <br /> Schuler Property Tracy, California Irerracon <br /> May 30, 2019 Terracon Project No. NA197026 <br /> collected into two clean glass 40 ml VOA preserved with ascorbic and meleic acid and analyzed <br /> for DBCP 1 2-Ribromo-3-chloropropane) by EPA Extraction Method E524.3. Nitrate as N was <br /> reported 15.0 mg/Lir groundwater sample GW-1 above the MCL of 10 mg/L N. roup water <br /> sample G - eelowlaboratory reporting limits of 0.010 micrograms per liter (ug/L) for <br /> DBCP. <br /> 1.4.5 Groundwater Sample Handling <br /> 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 Survey 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 Stomar clay loam soils with 0 to 2 percent slopes. Parent material is <br /> alluvium derived from sedimentary rock. Typical soil profiles consist of 0 to 17 inches clay loam, <br /> 17 to 47 inches clay, and 47 to 60 inches clay loam. Stomar clay loam are well drained with high <br /> runoff class, slow permeability, and high shrink swell potential.The rate of water intake in irrigated <br /> areas is 0.5 inches per hour. For sites with septic systems, the main limitations are slow <br /> permeability and high water table which may effect the effectiveness of the septic system. Slow <br /> permeability can be improved by increasing the size of the absorption field. <br /> 1.5.1 Soil Boring Locations <br /> Percolation test boring (B1) is located west of the existing mobile home and north of the barn. <br /> Soil boring (B2)was located approximately 5 feet north of boring B1. Refer to Appendix A, Exhibit <br /> 2 for the boring 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 3.5 feet bgs and boring B2 was excavated to a depth of approximately <br /> 10.0 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 /> Responsive ■ Resourceful ■ Reliable 8 <br />