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July 30, 1997 <br /> Based on the above, estimates of annual leachable nitrogen from the current agricultural land <br /> use (planting rotation of two years of corn followed by one year of soybeans or alfalfa) is as <br /> follows: <br /> Leachable Ag-N =46 ac x(2 yr+3 yr)x 160 lb-N/ac/com yr x(1 -0.4) <br /> =2,940 lb-N/yr <br /> Estimates of annual leachable nitrogen from the proposed school use would be: <br /> Leachable School-N =300 cap x 5.2 kg-N/cap/yr x 2.2 lb/kg x(8 hr/dy+16 hr/dy)x(185 dy/yr+365 dy/yr) <br /> =870 lb-N/yr <br /> Therefore, there is more nitrogen available for impacting groundwater with agricultural use of <br /> the property than from the proposed school onsite wastewater treatment and dispersal system. <br /> This is also true for the projected build-out capacity of 875 people. For this population, the <br /> estimated leachable school-N is 2,540 lb-N/yr. <br /> Anderson,M. 1997.Personal communication. Univ.of Wis.Soil&Plant Analysis Lab,Madison,WI. <br /> 2 Keeney,D.R.and R.F.Follett. 1991.Managing nitrogen for groundwater quality and farm profitability:Overview and introduction. <br /> p. 1-7.In Follett,R.F.,D.R.Keeney,and R.M.Cruse eds.Managing Nitrogen for Groundwater Quality and Farm Profitability. <br /> SSSA,Madison,WI. <br /> 3 Laak,R. 1986.Wastewater Engineering Design for Unsewered Areas,2nd Ed.Technomic Pub.Co., Lancaster,PA. <br /> 4 Wis.Dept.of Commerce. 1997.Draft environmental impact statement for proposed changes to Chapter Comm 83,Comm 85 <br /> and other related rules.Wis. Dept.of Commerce,Madison,WI. <br /> 5 Shaw,B. 1994. Nitrogen contamination sources:A look at relative contributions.In Nitrate in Wisconsin's Groundwater. <br /> Strategies and Challenges.Central Wis.Groundwater CU.,Stevens Point,WI. <br /> d:lbobwldata\rwwproj\private\wi\cntryday\ckmo01.doc <br /> 52-0167.11 <br /> Page 2 of 2 <br />