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Soil Suitability / Nitrate Loading Study r Terracon <br /> FLAG CITY TRUCK AND EQUIPMENT PARKING FACILITY I Lodi, California <br /> October 6, 2023 1 Terracon Project No. NA237081 <br /> and approach) is for estimation of long-term effect (i.e., over years) on groundwater <br /> quality, and is not intended for prediction of seasonal changes" (Hantzsche and <br /> Finnemore, 1992). <br /> The method takes into account the development area, soil denitrification factor, rainfall <br /> volume, rainfall nitrate concentration, waste effluent quantity, and waste effluent nitrate <br /> concentration. The formula, assumptions and calculations used for the analysis are <br /> shown in Appendix F. The units of nitrate used in the mass balance equation are nitrate- <br /> N, whose maximum drinking water 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 <br /> Joaquin County (1992) for information regarding Capay clay (Section 1.5). Selected <br /> physical and chemical properties for the soil types are listed in the following table. <br /> Table S. <br /> Physical and Chemical Properties <br /> Soil <br /> Name / Depth USDA Unified Soil Clay Permeability Soil reaction Salinity Septic tank <br /> Map Texture Classification absorption <br /> Symbol (in) (%) (in/hour) (PH) (mmhos/cm) fields <br /> Sandy <br /> 0 19 Loam SM 7-18 2.0-6.0 6.1-7.8 <2 <br /> Sandy <br /> Loam, <br /> fine Moderate <br /> Acampo 19-47 sandy <br /> loam, SM 7-15 2.0-6.0 6.6-8.4 <2 <br /> (101) coarse <br /> sandy <br /> loam <br /> 47-49 Indurated <br /> 49-60 Cemented <br /> Sandy <br /> 0 13 Loam SM 7-18 2.0-6.0 6.6-8.4 <2 <br /> Devries Moderate <br /> (149 <br /> 13-28 Loamy SandSM 7-18 2.0-6.0 6.6-8.4 <2 <br /> fine <br /> Facilities I Environmental I Geotechnical I Materials 14 <br />