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October 12,2000 <br /> Job Number:LG00-312 <br /> Page 10 <br /> A typical quantity of 50-gallons/day per bedroom was assumed for septic system. The <br /> average nitrate concentration of the typical septic waste is normally considered to be'+45 m N. <br /> An adjustment must be added because the ground water was found to contain a low level of <br /> nitrate at a concentration of 6.8 tng/LrNO3 (1.5 mgfL-N)therefore a Ievel 46.5 mg/1-N was te <br /> used(45 + 1.5 =46.5 mg/L44, esEatedIevel ofwaste stream of the septic sy e .� <br /> Table: Total Estimated Effluen# <br /> (see worksheets in Appendix for calculations) <br /> Category Quantity People Daily effluent quantity for each analysis <br /> estimation <br /> Residential 50 3 50 gallons/day/person x 3 people_= 150 gallons/day <br /> 3 bedroom home gallons/day/person <br /> Residential 50 4 50 gallons/day/person x 4 people=200 gallons/day <br /> 4 bedroom home galloRYda / rson <br /> The following tables summerize the results of the nitrate loading analysis to determine the <br /> minimum area to support a septic system for a three(3) and four(4)bedroom home. The <br /> calculation is shown in Plates 9 and 10 in the appendix. <br /> Mass Balance Analysis to Determine Minimum Area of Parcel Required for a <br /> Residence with Four(4)Bedrooms. <br /> [Acres Maximum Denitf�ication' Deep Rain Waste level' Rain <br /> Allowable Result Percolation Concentration <br /> MCUN <br /> 10 m -N 25% 6.79 inches 46.5znZn N 0.17 m N <br /> 1 <br /> a U.S.Environmental Protection Agency(EPA). 1980. Design Manual:On-Site Wastewater Treatment <br /> and Disposal Systems.Report No.EPA-625/ 1-80-012.390 pp. <br /> r pl�:py <br /> . Q A <br /> �ssnc� <br /> t <br />