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Soil Suitability and Nitrate Loading Evaluation CTE Job # 25-0710 <br /> Great Pacific Nut—Nut Processing Facility Expansion <br /> 3501 Lehman Road <br /> Tracy, California <br /> Aujzust 1, 2019 Page 7 of 10 <br /> NC _ [I (NW) (1-D) + R (Ne)] /(I+R) <br /> 1, = Volume rate (Gal/day) of waste water entering the soil from 12 employees and <br /> Industrial Building No Food Cafeteria" = 15 gal/per person (per SJC Onsite <br /> Wastewater Treatment Systems Standards, January 2017): <br /> = 12 x 15 = 180 gal/day. <br /> Iz = Volume rate (Gal/day) of waste water entering the soil from existing <br /> single family dwelling: <br /> = 2 bedrooms x 150 gal/day= 300 gal/day. <br /> Lots = 11+ 12= 180 gal/day+ 300 gal/day <br /> =480 gal/day <br /> Volume rate converted to inches/year and averaged over the gross developed DC7 <br /> area (using 1/]0 acre): �\ <br /> = 480 gal/day x 365 days/year x ft3/7.48 gal x I acre/43,560 ftz x 12 in/ft x �p� <br /> 1/10 acre <br /> 0.645 inches/year. <br /> NW = Nitrate concentration of nitrified leach-field effluent is assumed to be on <br /> the order of 40 mg/1 (average is 35 to 45 mg/I per Hantzsche and <br /> Finnemore; 1992). <br /> D = Fraction of nitrate-nitrogen loss due to dentrification of leach field effluent is <br /> assumed to be 0.25 (most representative of typical onsite sewage <br /> disposal situations per Hantzshe and Finnemore, 1992 & U.S. EPA, 1980, <br /> 1981). <br /> t_.3Nc- <br />