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Nitrate Loading study Irerracon <br /> Ciao Property® Ripon,California <br /> September6, 2018 ■ Terracon Project No. NA187038 <br /> term effect(i.e., over years)on groundwater quality, and is not intended forpredictien of seasonal <br /> changes" (Hantzsche and i=innemore, 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 B. The units <br /> of nitrate used in the mass balance-equation are nitrate as N. The United States Environmental. <br /> Protection Agency (EPA) maximum contaminant lever (MCL) for nitrate as N in drinking water is <br /> 10 milligrams per liter(mg/Q. <br /> 1.0 CHEMICAL AND PHYSICAL SOIL PROPERTIES <br /> 1.1 Chemical and Physical Soil Properties <br /> T erracon reviewed the United States Department of Agriculture (USDA) Natural Resources <br /> Conversation Service (NRCS) Web Soil Survey and USDA Soil Survey of San .ioaquin County <br /> (1992 for information regarding soil properties. Based on information obtained from the USDA <br /> sources, site soils consist of three soil types including Delhi loamy sand, Timor loamy sand, and <br /> Chuloak coarse sandy loam. Selected physical and chemical properties for the three soil types <br /> are listed in the following table. <br /> Table 1. <br /> Physical and Chemical Properties* <br /> Soil Soil Salinity Septic <br /> Name t Depth USDA Unified Soil Clay Permeability tank <br /> reaction {mmho <br /> Map (in) Texture Classification (in/hour) (pH) s/cm) absorption <br /> Symbol fields <br /> 0-16 loamy sand SM 0-5 6.0-20 6.1-7.8 <2 <br /> Delhi! 16-26 loamy sand SM 0-5 6.0-20 6.1-7.8 <2 Severe; <br /> 142 poor-filter <br /> 26-60 sand SP-SM 0-5 6.0-20 6.1-7.8 <2 <br /> 0-14 loamy sand SM 2-10 6.0-20 6.6-7.8 <2 <br /> Timor! Severe; <br /> 14-6 loamy sand SM 2-10 6.0-20 7.4$.4 <2 <br /> 254 56-60 cemented -- __ _ v poor filter <br /> coarse <br /> 10- <br /> 0-19 sandy loam SM 20 2,0-6.0 5.6 .5 <2 <br /> 19-44 sandy clay SC-SN 18 0.2-0.06 6.1-7.3 <2 Severe; <br /> Chuloak loam 25 <br /> /127 44-55 sandy loam SM 5-15 2.0-6.0 6.6-7.3 <2 peres <br /> slowly <br /> loamy <br /> 55-64 coarse SM 5-10 6.0-20 6.6-7.3 <2 <br /> sand <br /> *Selected USDA physical and chemical properties <br /> Responsive ■ Resourceful ■ Reliable 3 <br />