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LUCCA WINERY <br /> SOIL SUITABILITY & NITRATE LOADING STUDY APRIL 2013 <br /> NLS§ 3.4, 3.5, 3.6 PREDICTED NITRATE-NITROGEN LOADING FROM THE LUCCA <br /> WINERY USING THE MAXIMUM AVERAGE DAILY FLOW (ADF) OF 42 GALLONS <br /> PER DAY FOR THE RESTROOM FACILITY, AND TAKING THE PROJECT AREA OF <br /> 20 ACRES INTO CONSIDERATION: <br /> HANTZSCHE/FINNEMORE EQUATION <br /> 1Nw(1 - d) + RNe <br /> Nr = (/ + R) <br /> Where: <br /> Nr = Resultant average concentration of nitrate-nitrogen in recharge water - (ppm NO3-N) <br /> = Volume rate of wastewater entering the soil averaged over the gross developed area in <br /> inches per yr I <br /> - Nw = Total nitrogen concentration of wastewater in mg N/L <br /> d = Fraction (%) of nitrate-nitrogen loss due to denitrification in the soil <br /> R = Average recharge rate of rainfall - inches per yr NLS§ 3.2 ' <br /> �2 <br /> Nn = Background nitrate-nitrog-d i�Oncentration of rainfall recharge, exclusive of wastewater <br /> influences (ppm NO3-N) , , N <br /> i <br /> Values and Assumptions: <br /> 42gpd x 365 d = 15,330 gals x 47. 8 g3 als = total WW = 2,050 f t3 _ <br /> / = Z 0ift .028 in <br /> 20 Ac x 43560 ftAc x (12.- <br /> Nw = 103 mg N/L: 20% reduction from the septic tank = (1-0.2)103 = 82 mg N/L <br /> d = Assume 15% due to the fine-grained soil at the potential soil-effluent interface soil <br /> chemistry results <br /> R = 12.0 in/yr ✓, <br /> /Uw <br /> Nb = Assumed to be 0.1 ppm NO3-N <br /> 0.028-(82m" (1 - 0.15) + (12.0x0.1 9) <br /> Ni- = <br /> (0.028+ 12.0 tri/yr) <br /> Page 10 <br />