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Soil Suitability/ Nitrate Loading Study <br /> Ripon Winery Proposed Warehouse ■ Ripon, CA 1 rerracon <br /> January 20, 2017 ■ Terracon Project No. NA167059 <br /> term effect(i.e., over years)on groundwater quality, and is not intended for prediction of seasonal <br /> changes" (Hantzsche and Finnemore, 1992). <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 E. The units <br /> of nitrate used in the mass balance equation are nitrate-N, whose 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 from 0 to 3.0 feet are permeable and will allow for <br /> moderate to rapid infiltration of water. The longer the effluent remains near the surface, the more <br /> treatment is enhanced due to natural processes within the soil. If the permeable soils exist to the <br /> depth of the groundwater table, it is possible that surface contaminants may be transported fairly <br /> rapidly, however based on the known clay and hardpan subsurface strata in the area, the surface <br /> sandy soil is not expected to continue to groundwater. <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 /> There are reportedly no wells near the site used to supply drinking water, as noted in Section <br /> 1.4.3. <br /> Responsive■ Resourceful ■ Reliable 12 <br />