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Soil Suitability/ Nitrate Loading Study 1 rerracon <br /> Sun Valley Express Truck Center a Acampo, California <br /> August 14, 2017 n Terracon Project No. NA177026 <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 B. The units <br /> of nitrate used in the mass balance equation are nitrate-N, of which the maximum drinking water <br /> contaminant level (MCL) is 10 mg/L. <br /> 2.1 Chemical and Physical Properties of Soil <br /> 2.1.1 Chemical and Physical Soil Properties <br /> For a discussion of on-site soil properties, refer to Section 1.5. <br /> 2.1 .2 Mass Transport Soil Properties <br /> The percolation test has revealed that soils at 25.0 feet bgs are permeable and will allow for <br /> moderate infiltration of water. The longer the effluent remains near the surface, the more <br /> treatment is enhanced due to natural processes within the soil. <br /> 2.2 Groundwater Analysis <br /> 2.2.1 Regional Groundwater <br /> A discussion of regional groundwater, including depth to groundwater and flow gradient is <br /> included in Section 1.4.1. No significant seasonal trends were evident from the sources <br /> consulted. <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 />• <br /> There are reportedly no wells near the site used to supply drinking water, as noted in Section <br /> 1.4.3. <br /> 2.3 Sources and Impact of Nitrate to Groundwater <br /> 2.3.1 Current Off-Site Sources of Nitrate <br /> Agriculture and residential properties in the area may be the most significant sources of nitrate in <br /> groundwater. Based on the anticipated depth to groundwater (<90 feet bgs) and relatively low <br /> septic system density near the site (Section 1.3.4), the off-site properties are not anticipated to <br /> contribute significant sources of nitrate to groundwater. <br />• <br /> Responsive■ Resourceful ■ Reliable 12 <br />