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October 7, 1999 <br /> Job Number: 599226 <br /> Page 8 <br /> Water Use Computation Factors and Building Occupancy <br /> Phase Day Bldg l & Bldg 2& Bldg 2& Bldg 3& Bldg 4& Bldg 5& Bldg 6& Bldg 7& <br /> Sys l Sys. 2 Sys. 2 Sys. 3 Sys 4 Sys 5 Sys 6 Sys 6 <br /> (ad 10 415 (a5 (U5 (d, 15 450 @5 @50 <br /> gal/pers. gal/pers. gat/pers. gal/pers. gal/pers. gal/pers. gal/pers. gal/pers. <br /> 1 Sun 450 0 20 <br /> M-F 10 100 0 <br /> Sat 1 0 0 0 <br /> 2 Sun 100 0 20 550 50 5 0 <br /> M-F 10 100 0 10 150 5 0 <br /> Sat 0 0 0 0 0 5 0 <br /> 3 Sun 100 0 20 775 50 5 0 4 <br /> _ M-F 10 100 0 10 150 5 0 4 <br /> Sat 0 0 0 5 0 5 0 4 <br /> Note: Building 2 has two different water use computation factors(gal/pers.). <br /> Results and Variables Used in the Nitrate Mass Balance Analysis <br /> Project Result of Quantity of Denitrifi- Waste level° Deep Rain Rain <br /> Phase Analysis waste discharge cation' Percolation Concentration° <br /> 1 6.6 mg/I-N 2.01 Acre-ft 25% 45 mg/1-N 7.86 in/yr 0.17 mg/1-N <br /> 2* 9.1 mg/I-N 4.13 Acre-ft 25% 45 mg/1-N 7.86 in/yr 0.17 mg/1-N <br /> 3* 9.9 -N 1 4.53 Acre-ft 25% 45 m -N 7.86 ' 0.17 m -N <br /> ` *In order to achieve average levels below 10 mg/I-N, an intermittent sand filter design or equivalent is required on <br /> septic system 4 after Phase 1 development. <br /> Analysis has shown that the nitrate load estimate of Phase 1 will fall below the drinking <br /> water standard of 10 mg/1-N but Phase 2 and Phase 3 will exceed the maximum drinking water <br /> standard for nitrate using standard septic systems. A telephone conversation with Mr. Jamon <br /> Ellinson of Orenco Systems Inc. indicated that an intermittent sand filter system commonly <br /> reduces the nitrate concentration to less then 25-30 mg/1-N before leach field denitrification. The <br /> h <br /> aHantzshe N.N., Finnemore,E.J. 1991,Predicating Ground-Water Nitrate-Nitrogen Impacts. Ground <br /> Water Vol. 30,No. 4. <br /> �eER{ <br /> 4 <br /> s <br />