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Nitrate Loading Study Irerracon <br /> Guillermo Ramirez Property ■ Ripon, California <br /> April 29, 2019 ■ Terracon Project No. NA197019 <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 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 level (MCL)for nitrate as N in drinking water is <br /> 10 milligrams per liter (mg/L). <br /> 1.0 CHEMICAL AND PHYSICAL SOIL PROPERTIES <br /> 1.1 Chemical and Physical Soil Properties <br /> Terracon reviewed the United States Department of Agriculture (USDA) Natural Resources <br /> Conversation Service (NRCS) Web Soil Survey and USDA Soil Survey of San Joaquin County <br /> (1992) for information regarding soil properties. Based on information obtained from the USDA <br /> sources, site soils consist of Delhi loamy sand and Chuloak coarse sandy loam. Selected physical <br /> and chemical properties are listed in the following table. <br /> Table 1. <br /> Physical and Chemical Properties* <br /> Soil Soil Salinity Septic <br /> Name/ Depth USDA Unified Soil Clay Permeability tank <br /> Map (in) Texture Classification (%) (in/hour) reaction (mmho(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/ Severe; <br /> 16-26 loamy sand SM 0-5 6.0-20 6.1-7.8 <2 <br /> 142 poor filter <br /> 26-60 sand SP-SM 0-5 6.0-20 6.1-7.8 <2 <br /> 0-19 coarse SM 200 2.0-6.0 5.6-6.5 <2 <br /> sa <br /> Y <br /> Chuloak 19-44 sandy <br /> loam clay <br /> SC-SN 5 0.2-0.06 6.1-7.3 <2 Severe; <br /> / 127 44-55 sandy loam SM 5-15 2.0-6.0 6.6-7.3 <2 peres <br /> loamy slowly <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 /> 1.2 Mass Transport Soil Properties <br /> The below additional information pertaining to mass transport for was obtained from the USDA <br /> sources listed in Section 1.1. <br /> Delhi loamy sandy soils comprise approximately 84% of site soils and are located across the <br /> majority of the site. Delhi loamy sandy soils consist of somewhat excessively drained soils with <br /> Responsive ■ Resourceful ■ Reliable 3 <br />