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File No, 20-2983-03 <br /> ' UN l(LEINFELl)ER <br /> October 26, 1990 <br /> 3 • "Review Committee Report On Evaluation of <br /> E $ <br /> Sources of Nitrate in Groundwater of the Chico <br /> I` Urban Area, " Butte County, dated September 26, <br /> f 1989. <br /> 4• A Review of the Nitrate Problems in the <br /> Groundwater of the Santa Ana region and Their <br /> Relationship to High Density Developments on <br /> Septic Tank-Subsurface Disposal Systems, dated <br /> September 8, 1989, by the CRWQCB, Santa Ana <br /> region. <br /> According to our review of the above references an <br /> with Mr. Dykstra, the "Hantzche mass balance e d our discussions <br /> '� equation is one means <br /> of estimating nitrate concentrations in <br /> r groundwater. In the CRWQCB <br /> report on nitrate concentrations in the Chico area, this formula <br /> was found to be sensitive to flow figures, home occupancy levels, <br /> and denitrification rates. The "Hantzche" equation is presented <br /> below with an explanation for each factor. <br /> Nc = AW .x Nw 1-D + r Nb <br /> AW + r <br /> Where: NC is the nitrate concentration in ground water <br /> 4 resulting from domestic sources and precipitation - <br /> mg/1 <br /> A is the number of dwellingunits <br /> tanks - unit/acre Per acre on septic <br /> W is the annual wastewater loading �+ <br /> acre - inches Per dwelling per ' <br /> Nw is the nitrate concentration of nitrified leach <br /> YV <br /> �1 <br /> field effluent - mg/l <br /> copyright 1990 Kleinfelder, Inc. 3 <br />