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Soil Suitability / Nitrate Loading Study r ierracon <br /> FLAG CITY TRUCK AND EQUIPMENT PARKING FACILITY I Lodi, California <br /> October 6, 2023 1 Terracon Project No. NA237081 <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 /> loam <br /> r28-80 Indurated <br /> Note: U.S. Department of Agriculture, Soil Conservation Service, 1992, Soil Survey of San Joaquin <br /> County, California. 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 <br /> natural processes within the soil. The percolation test has revealed that the onsite soils <br /> have adequate percolation rate at 3.0 and 6.8 feet and slow percolation rates at 9.8 feet <br /> bgs. Refer to Sections 1.6.6 and 1.6.7 for additional discussion. <br /> 2.2. Groundwater Analysis <br /> 2.2.1. Regional Groundwater <br /> A discussion of regional groundwater, including depth to groundwater and seasonal <br /> trends are 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 <br /> Section 1.4.2. <br /> 2.2.3. Current and Future On-Site Ground Water Uses <br /> The facility is proposed to be connected to a new septic system. <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 <br /> of nitrate in groundwater. Septic tank use in the vicinity is discussed in Section 1.3.5. <br /> Facilities I Environmental I Geotechnical I Materials 15 <br />