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' Nitrate Loading Study Irerracon <br /> Arriaga Property Stockton, California <br /> April 26, 2019 P, Terracon Project No. NA187059 <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 Hollenbeck silty clay and Jacktone clay. Selected physical and <br /> chemical properties are listed in the following table. <br /> Table 1. <br /> Physical and Chemical Properties* <br /> Soil Name Soil Salinity Septic tank <br /> Depth USDA Unified Soil Clay Permeability <br /> /Map (in) Texture Classification (%) (in/hour) reaction (mmhos/ absorption <br /> Symbol (pH) cm) fields <br /> 0-10 Silty clay CH, CL 40-60 0.06-0.2 <br /> Hollenbeck 10-37 Clay CH, CL 40-60 0.06-0.2 6.6-8.4 <2 Severe; <br /> ----- ---------- .._.._._... ----------- ------ -- -------- <br /> / 173 37-42 Silty day CL 30-40 0slowly <br /> .2-0.6 6.6-8.4 <2 peerccs <br /> -- ---------- ---------------- ------ ------ --------— ------ ------- <br /> 42-60 Cemented -- --- --- --- <br /> 0-22 Clay CL,CH 40-60 0.06-0.2 6.6-8.4 <2 <br /> 22-34 Clay CL, CH 35-60 0.06-0.2 7.9-9.0 <2 <br /> 34-37 Indurated -- --- --- --- --- Severe; <br /> Jacktone Stratified cemented <br /> clay/ 180 sandy pan, peres <br /> 37 46 loam to CL-ML, CL 20-30 0.2-0.6 7.9-9.0 <2 slowly <br /> clay loam <br /> 46-60 Cemented -- -- -- --- --- <br /> 'Selected USDA physical and chemical properties <br /> 1.2 Mass Transport Soil Properties <br /> The below additional information pertaining to mass transport was obtained from the USDA <br /> sources listed in Section 1.1. <br /> Responsive a Resourceful ir-; , l ,^ 3 <br />