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s. October 12,2000 Job Number:LGOO-312 Mass Balance Analysis.to Determine'Minimum Area of Parcel Required for a - Residence with Three(3)'Bedroonis.' Acres Ma�mum Denitrification 7 Deep Rain Waste level' Rain Allowable Result Percolation . Concentration MCL-N 0.75 10 m -N. 25% 6.79 inches 46.5 m N 0.17 N 'The nitrate loadinganalysis has shown that y at an acceptable average level of nitrate fi.om a typical 4-bedroom.home's septic system requires a minimum development density of about 1- acre. The analysis has,shown,that-an acceptable,average level of nitrate from a typical 3- bedroom home's septic system requires a minimum develo meat densi of about 0.7 acres. P tY.. For the nitrate loading analysis,the maximum acceptable average level of nitrate concentration used was the MCL for drinking water of 10 mg/l,N. The analysis has shown that over the long- i terns,the average'concentration of percolating rain/effiuent,may exceed 10 mg/L-N if the developrnem.density exceeds the estimates stated previously: The assumptions used'in this , analysis are typical in the literature and profession. The nitrate analysis has shown that for the different sizes'of the proposed parcels,parcel ^ numbers 1 through 1.4 exceed the mhumum acreage requirement for a 4-bedroom home with septic system. •The acreage of parcel numbers 15, 17,-19, and 21�exceed the minimum acreage requirement far'a 3-bedroom home-with septic system. These lots:exceed the criteria for.3 and 4 = bedroom homes utilizin se tics stems with leach lines and. tic its. �r : g-septic Y septic P� However, due to the small acreage of parcel numbers-16, 18,20, and.22;these parcels are . ! not suitable for use with a conventional septic.system. .If parcel numbers.16, 18, 20, 22 were increased in.size.to the inumum acreage previously discussed and,suitable percolating rates were : measured,they would be suitable,for a conventional septic systems with leach lines and seepage -pits. Parcels with small acreage are,not as desirable as larger parcels because they would increase' the estimated development density'of the area. �t. . VIIL CONCLUSIONS AND RECOMMENDATIONS. r In conclusion,the"soils investigated for Parcels 1-15, 11, 19:and 21 are capable of satisfactory percolation.rates for.use with-an on-site conventional septic system. Generally thin, permeable sandy lenses were located between the depths of 34feet and 25-feet will provide