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..� <br /> August 3, 2004 <br /> NOA Project Number: E04081A <br /> Ground Water, Hantzsche and Finnemore mention that "...the equation ignores dispersion, <br /> lateral flow, and mixing with ground water flow from up-gradient areas. These processes <br /> would generally contribute to additional reduction of nitrate-nitrogen concentrations in <br /> _ ground water to the extent that the nitrate-nitrogen concentration of ground-water flow from <br /> up-gradient areas is lower." <br /> The Hantzsche and Fennemore approach is "...a conservative (worst case) first approximation <br /> of ground-water nitrate-nitrogen concentration resulting from the combined effect of on-site <br /> sewage disposal systems and precipitation. This (the equation and approach) is for estimation <br /> of long-term effect (i.e., over years) on ground-water quality, and is not intended for <br /> prediction of seasonal changes" (Hantzsche and Finnemore, 1992). <br /> The method takes into account the development area, soil denitrification factor, rainfall <br /> volume, rainfall nitrate concentration, waste effluent quantity, and waste effluent nitrate <br /> concentration. The formula, assumptions and calculations used for the analysis are shown on <br /> Plate 10. The units of nitrate used in the mass balance equation are nitrate-N, whose <br /> maximum drinking water contaminant level is 10 mg/L. <br /> 7.1 Quantity and Quality of Domestic Wastewater From Proposed Project <br /> The average predicted daily flow for the proposed use of the Site was calculated in section 3.6 <br /> of this report to be 494 gpd. <br /> The average total nitrogen concentration of the domestic waste water is normally considered <br /> to be 20-85 mg/L-N (Crites and Tchobanoglous, 1998). For the purpose of the nitrate loading <br /> estimate, the long-term average concentration for total nitrogen in waste water is estimated to <br /> be 45 my,/L-N. <br /> Mr. Brad Peterson indicated during a telephone interview on July 27, 2004 that he expects the <br /> winery to generate a maximum of 5,00_0 gallons of waste water per year. The waste water is <br /> primarily generated from the washing of empty wine barrels. He stated that the winery waste <br /> ._ water will be hauled offsite. As a result, we have-not-included winery waste water in our <br /> analysis. � A � <br /> t�,, ":�,4 a" <br /> &WLAJ ew <br /> 12 <br />