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October 12,2000 <br /> Job Number.LGOO-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 mg/L-NO3 (1.5 mg/1,N)therefore a level 46.5 mg/I-N was I <br /> used(45 + 1.5 =46.5 mg/U , e tmate evel of waste stream of septic Sys e <br /> . s l• S' <br /> E Table: Total Estimated Effluent <br /> (see worksheets in Appendix for calculations) <br /> Category Quantity People Daily efflaent,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 gallonstday/person x 4 people=200 gallons/day <br /> 4 bedroom homellonslda / rson <br /> E� <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 DenitrificationDeep Rain Waste ievel' Rain <br /> Allowable Result Percolation Concentration <br /> MCL-N <br /> 1.0 10 m -N 25% 6.79 inches 46.5 N 0.17 m N <br /> s 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 /> rde�s <br /> . r s <br /> } <br /> a � <br /> ♦ sots <br /> it <br />