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Soil Suitability / Nitrate Loading Study Irerracon <br />JPM ® Lathrop, California <br />May 24, 2022 in Terracon Project No. NA227026 <br />Table 8. <br />Physical and Chemical <br />Properties" <br />Soil Name <br />Soil <br />Septic tank <br />Depth <br />USDA Unified Soil Clay <br />Permeability <br />Salinity <br />/Map <br />(in) <br />Texture Classification (%) <br />(in/hour) <br />reaction <br />(mmhos/cm) <br />absorption <br />Symbol <br />(pH) <br />fields <br />Dello <br />0-7 <br />Loamy sand SM 0-10 <br />6.0-20 <br />6.6-8.4 <br /><2 <br />sandy <br />Sand, fine <br />Severe; poor <br />7-60 <br />SM, sP-sM 0-7 <br />6.0-20 <br />6.6-8.4 <br /><2 <br />filter <br />loam (145) <br />sand <br />Dello clay <br />0-12 <br />Clay loam CL 30-40 <br />0.2-0.6 <br />6.6-8.4 <br /><2 <br />Severe; <br />loam <br />12-60 <br />Sand, fine SM, SP -SM 0-7 <br />6.0-20 <br />6.6-8.4 <br /><2 <br />poor <br />filter <br />(148) <br />sand <br />`U.S. Department of Agriculture, Sal Conservation Service, 1992, boil Survey of ban Joaquin County, camornla. <br />Selected USDA physical and chemical properties <br />millimhos per centimeter (mmhos/cm) <br />2.1.2 Mass Transport Soil Properties <br />The longer the effluent remains near the surface, the more treatment is enhanced due to natural <br />processes within the soil. The percolation test has revealed that the onsite soils have rapid <br />percolation rates at 3.0, 3.5 and 6.5 feet bgs. Refer to Sections 1.6.6 and 1.6.7 for additional <br />discussion. <br />2.2 Groundwater Analysis <br />2.2.1 Regional Groundwater <br />A discussion of regional groundwater, including depth to groundwater and seasonal trends are <br />included in Section 1.4.1. <br />2.2.2 Potential Ground Water Contamination Issues <br />A discussion of issues related to potential groundwater contamination is included in Section 1.4.2. <br />2.2.3 Current and Future On -Site Ground Water Uses <br />The future facility is proposed to be connected to the existing domestic groundwater supply well <br />and a proposed second well. <br />2.3 Sources and Impact of Nitrate to Groundwater <br />2.3.1 Current Off -Site Sources of Nitrate <br />Agricultural land use and septic systems in the area may be the most significant sources of nitrate <br />in groundwater. Septic tank use in the vicinity is discussed in Section 1.3.5. <br />, r 15 <br />