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Soil Suitability / Nitrate Loading Study <br />Thornton Road Trailer Parking Facility ■ Lodi, California <br />December 15, 2021 ■ Terracon Project No. NA217079 <br />Responsive ■Resourceful ■Reliable 12 <br />The method takes into account the development area, soil denitrification factor, rainfall volume, <br />rainfall nitrate concentration, waste effluent quantity, and waste effluent nitrate concentration. The <br />formula, assumptions and calculations used for the analysis are shown in Appendix F. The units <br />of nitrate used in the mass balance equation are nitrate-N, whose maximum drinking water <br />contaminant level (MCL) is 10.0 mg/L. <br />2.1 Chemical and Physical Properties of Soil <br />2.1.1 Chemical and Physical Soil Properties <br />Terracon reviewed the USDA NRCS Web Soil Survey and USDA Soil Survey of San Joaquin <br />County (1992) for information regarding Devries sandy loam and Acampo sandy loam (Section <br />1.5). Selected physical and chemical properties for the soil types are listed in the following table. <br />Table 6. <br />Physical and Chemical Properties* <br />Soil Name <br />/ Map <br />Symbol <br />Depth <br />(in) <br />USDA <br />Texture <br />Unified Soil <br />Classification <br />Clay <br />(%) <br />Permeability <br />(in/hour) <br />Soil <br />reaction <br />(pH) <br />Salinity <br />(mmhos/cm) <br />Septic tank <br />absorption <br />fields <br />Devries <br />Sandy <br />loam (149) <br />0-13 Sandy loam SM 7-18 2.0-6.0 6.6-8.4 <2 <br />Severe; <br />cemented pan13-28 <br />Sandy loam, <br />fine sandy <br />loam <br />SM 7-18 2.0-6.0 6.6-8.4 <2 <br />28-80 Indurated -----------<2 <br />Acampo <br />sandy <br />loam <br />(101) <br />0-19 Sandy loam SM 7-18 2.0-6.0 6.1-7.8 <2 <br />Moderate: <br />cemented pan <br />19-47 <br />Sandy loam, <br />fine sandy <br />loam, <br />coarse <br />sandy loam <br />SM 7-15 2.0-6.0 6.6-804 <2 <br />47-49 Indurated -------------- <br />49-60 Cemented -------------- <br />*U.S. Department of Agriculture, Soil Conservation Service, 1992, Soil Survey of San Joaquin County, California. <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 adequate <br />percolation rates at shallow (3 and 3.5 feet bgs) and (6.3 feet bgs). Refer to Sections 1.6.6 and <br />1.6.7 for additional discussion. <br />2.2 Groundwater Analysis <br />2.2.1 Regional Groundwater