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Soil Suitandit)&Ninale bwfina Sind, Pate, 11 <br /> Pmpomd Stant W'iueru. 17321 Dads Rd-Lodi CA <br /> Project No, 670 LIB <br /> .hilt,22.2013 <br /> 7.2 Nitrate Loading Calculation <br /> The following discussion smnmarizes the total nitrate loading from the proposed new systern <br /> An estimate is made of total nitrate load as calculated from a simple mass-balance approach <br /> The Hantzsche and Finnemore model is then used to estimate the nitrate concentration in <br /> groundwater. The calculation worksheets are in .Appendix E <br /> The following table summarizes the Flow-rate calculation for the anticipated septic system. <br /> L" Annual Ave. Filluent Vol.welghtrd <br /> Fill Daily Flom(Q) ne \ Are. <br /> Caretaker Rcaidcncc t)ti.50U cal, 292 GPD 44 mad. 171 m 1 <br /> Full t'imc Ens ploue. 5.600 pd, 43 GPD 60 vniv L, 3.4 m L <br /> Part Time Employees 10.100 cal. 28 GPD 60 meet. 2.3 snaL <br /> Tsstina Room I))M gak 276 GPD 80 m d. 29.5 m 1. <br /> Markcmt M"lin s .i.Otq ilah 99 GPD 80 m d- L0.6 mill <br /> Comm9 Kitchens 3,600 10 60In •l. 0 9 m L <br /> TOTALS 272,920 Zah I X48 GPD 63.8 mgjL <br /> The total load will be 748 GPD at 63.8 mg/L nitrate concentration The Flantzsche and <br /> Finnetmorc model is there used to estimate the nitrate concentration in groundwater The <br /> calculation worksheet(s) ate in Appendix E <br /> S)elent Acres Daily�Fl— I 6rlluent Denitriricution 1'etvvlafinn ti Loading <br /> (bnc. V Facmr d R <br /> Proposed 10 1 748 GAD I 63.8 m !l. 1 5-. 7 SS o, 1 109 lbs <br /> The proposed septic system %N-ill produce a load of 109 pounds per year of nitrogen leading <br /> This represents an average concentration at the groundwater surface 6.32 a" of nitrogen, <br /> or 63 percent of the established maximum contaminant limit of 10 mg,l. The future system <br /> is estimated to result in nitrate loading to groundwater that will not exceed the MCL [limit. <br /> This calculation does not consider the dilution that occurs as newly introduced water mixes <br /> with the deeper groundwater. The calculated groundwater concentrations offer a "worst <br /> case estimate There is no detectable existme nitrate level from the laboratory analvsis of <br /> well water. The total nitrogen as nitrogen load would therefore be less than the MCL <br /> concentration of LO mgr'. <br /> 2937 Venemms Ave., 112411 Geo-Phase En irmmenral Inc. Pham. (2U9)469-u293 <br /> M,tJcm J.CA 95356 Fax 1209146rLOi 9i <br />