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LUCCA WINERY <br /> SOIL SUITABILITY & NITRATE LOADING STUDY APRIL 2013 <br /> NLS§ 3.4, 3.5, 3.6, SSS§ 3.7, PREDICTED NITRATE-NITROGEN LOADING F <br /> THE LUCCA WINERY USING THE MAXIMUM AVERAGE DAILY FLOW (ADF) OF 4 <br /> GALLONS PER DAY FOR THE RESTROOM FACILITY, AND TAKING THE PROJECT / <br /> AREA OF 20 ACRES INTO CONSIDERATION: <br /> HANTZSCHE/FINNEMORE EQUATION <br /> INW(1 — d) + RNb <br /> Nr = (I + 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 <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"NL—S§ 3.2 <br /> Nb = Background nitrate-nitrogen concentration of rainfall recharge, exclusive of wastewater <br /> influences (ppm NO3-N) <br /> Values and Assumptions: <br /> 3 <br /> 42gpd x 365 d = 15,330 gals x 7.48 gals = total WW = 2,050 ft3 <br /> 1 = z 0.0281nJyr <br /> 20 Ac x 43560 Ac x ( if t 1—tin) — <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 /> Nb = Assumed to be 0.1 ppm NO3-N <br /> a 0.028Yr (82 mgNl (1 — 0.15) + (12.0 Yr x 0.1 mg) <br /> Nr = <br /> (0.028Yr + 12.0 in/yr) <br /> Page 10 <br />