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October 12,.2000 = <br /> Job Number.LGOO-312 <br /> Page 10 <br /> AA 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 b .-N.g�- <br /> adjustment must be added because the ground water was,found to contain a low le 'Of <br /> nitrate at a concentration of 6.8 mg/L;-NO3 (1.5 mg&,N)therefore a level 46':5��-Nw" <br /> used 45 + 1.5 =46.5 m <br /> ( g1L- , esttmate evel of waste stream of the septic sys e <br /> Table: Total Estimated Efllpent <br /> ' (see worksheets in Appendix for calculations) <br /> Category ¢uan#ity People Daily efiacat quantity fvr each analysis' <br /> estimation <br /> Reside _ <br /> nt�al � •50,, • 3 50 gallons/day/person x 3,people= 150 galIonslday . <br /> 3 betiroam home gallons/day/person <br /> Residential 50. 4 50 gallorWday/person x 4 people=-200 gallons/day <br /> 4 bedroom home 11oi�s1 / rson 5 <br /> The following tables summenze the a results of the nitrate loading analysis to determine the <br /> mininium 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 fora. + <br /> Residence with Four(4)Bedrooms.". <br /> Acres . °Maaimam DenitrirICatioa' Beep RAn Waste.level 7, Rain <br /> Allowable Result Percolation Concentration <br /> MCL-N <br /> 1.0 . 10 n; -N ' '25% '6.79 inches ' 46.5 m 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-02511-80-012.390 pp. <br /> e � <br />