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n ;4 <br /> LUCCA WINERY <br /> SOIL SUITABILITY & NITRATE LOADING STUDY APRIL 2013 <br /> Nr = 0.262 ppm Nitrate as Nitrate (NO,) <br /> The calculated nitrate loading concentration in the recharge effluent from the new <br /> _ restroom is calculated to be under the Maximum Contaminant Level limit for nitrate in <br /> drinking water. The variables used in the calculations above are conservative. For <br /> example, the ADF of 42 gals/day is assumed 365 days per year. Secondly, the use of <br /> _. 103 mg N/L, is a much higher nitrogen concentration than those concentrations <br /> published from household or domestic sources. Various researchers place the nitrogen <br /> reduction occurring in septic tanks at 10% to 20%. From the May 8, 2003 Symposium <br /> "Onsite Wastewater Treatment - Nitrogen Removal," Dr. Stuart Oakley of Chico State <br /> University states that "approximately 20% of the total nitrogen generated is removed in <br /> the septic tank." <br /> Page 111 <br />