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Soil Suitability and Nitrate Loading Evaluation Page 7 <br /> U of P-Golf Practice Facility Expansion <br /> 6301 West Eight Mile Road <br /> Stockton, California <br /> May 13,2019 CTE Job#25-0711 G <br /> per liter (NO3) and 10 mg/I as Nitrogen (N) in groundwater. Presented below is our <br /> evaluation of nitrate loading which uses the Hantzshe mass balance equation (source: <br /> Predicting Groundwater Nitrate-Nitrogen Impacts, Hantzsche and Finnemore; 1992) <br /> attached as Appendix C. <br /> NC = Calculation of nitrate-nitrogen in groundwater resulting from leach field <br /> source and precipitation (mg/l, as N). <br /> Nc _ [I (NW) (1-D)+ R(Nb)] /(I+R) <br /> 11 = Volume rate (Gal/day)of waste water entering the soil from new building <br /> with 12 employees(per owner) and using "Day schools with cafeterias <br /> gym & showers''= 5 gal/per person: 12 persons x 25 = 300 gal/day. <br /> Iz = Volume rate (gal/day)of waste water entering the soil from existing Z5 <br /> Maintenance Bldg=15 gal/person x 15 employees =225 gal/day. <br /> (Per EHD 42-014/OWTS Standards 1/2017 "Industrial Bldg--No Cafeteria <br /> = 15 gal/person) & (Per Liquid Waste Permit dated 9/11/98 Maintenance / <br /> Bldg has 15 employees). <br /> I3 = Volume rate (Gal/day)of waste water entering the soil from an existing I t P <br /> Public Bathroom (I fixture--employee/public use): 150 gal/fixture= 150,. <br /> gal/day. <br /> Itota = I1+ I2.I3= 300 gal/day+225 gal/day+ 150 gal/day=675 gal/day <br /> Itotal = Volume rate converted to inches/year and averaged over the gross <br /> developed area(using 1/10 acre): <br /> 675 gal/day x 365 days/year x ft3/7.48 gal x 1 acre/43,560 ft2 x 12 in/ft <br /> x 1/10 acre=0.907 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 <br /> is 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 /> C,tiU C <br />