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r <br /> ULATED NITRATE-NITROGEN LOADING <br /> he calculated or estimated nitrate-nitrogen impact to the soil and ultimately to the <br /> is difficult to determine due to the number of variables involved. These variablesVariability in wastewater flows, nitrogen concentrations and dilution effects from sinks, <br /> and dishwashing, 2.) Impact from upgradient nitrate sources,particularly the agricultural farmland, <br /> 3.) Changes in groundwater directional flow and elevation, 4.) Denitrification potential of the <br /> underlying soil, and 5.)Rainfall recharge. <br /> NL 3. �,V3�. The following calculations predict the nitrate-nitrogen loading from the <br /> Mult ose Building using the following criteria: 1.) The Average Daily Flow based on the <br /> parameters described on Page 9 and 10, 2.)Using a Total Nitrogen concentration of 87 mg/L derived <br /> on Page 16 of the Primary Report, and 3.) Taking the entire project area of 20 acres into consideration: <br /> The Total Nitrogen of 87 mg/L was derived from aforementioned sampling of three Churches on septic <br /> tank systems within San Joaquin County. <br /> HANTZSCHEIFINNEMORE EQUATION <br /> Rjw(1 -d) +RNb <br /> �Nr (I+R) <br /> Where: <br /> Nr= Resultant average concentration of nitrate-nitrogen in recharge water-(ppm NO,-N) <br /> I = Volume rate of wastewater entering the soil averaged over the gross developed area in 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 (NLS§3.2) <br /> Nb= Background nitrate-nitrogen concentration of rainfall recharge, exclusive of wastewater influences <br /> (ppm NO3-N) <br /> Values and Assumptions <br /> 1= 1,775 gals/d x 365 days/yr=647,875 gals=total W W/vr=86,614 cu ft = 1.19 in. <br /> 20.00 Ac x 43,560 sq ft/Ac x(1 ft/12 in.) <br /> Nw = 87 mg N/L <br /> d = Assume 25%due to the clay content in the surface soils observed in the soil chemistry results. <br /> R = 9 in/yr. <br /> Nb= Assumed to be 0.1 ppm NO3 N <br /> 1.19 in/yr(87 mg N/L) (1 -0.25)+(9 in/yr x 0.1 mg/L) <br /> LLNrr <br /> (1.19 in/yr+9 in/yr) <br /> 07.7ppms nitrate-nitrogen (NO;N)0 <br /> 4.3 pp as nitrate (NO,) <br /> Page -11- <br /> Chesney Consulting <br />