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October 12,2000 Job Number:LGO312 Page 11 Mass Balance Analysis to Determine Minimum Area of Parcel Required for a Residence with Three(3) Bedrooms. Acres Masimua Dehafication 7 Deep Bain Waste level' RaDN Allowable Result. Percolation Concent MCL-N 0.75 10 m -N 25%0 6.79 inches 46.5 m N 0.17 m The nitrate loading analysis has shown that an acceptable average level of nitrate from 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 development density of about 0.75 acres. For the nitrate loading analysis,the maximum acceptable average level of nitrate concentration used was the MCL for drinking water of 10 mg/1-N. The analysis has shown that over the long= term, the average concentration of percolating rain/effluent may exceed 10 mg/L-N if the development 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 9 numbers 1 through 14 exceed the minimum 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 for a 3-bedroom home with septic system. These lots exceed the criteria for 3 and 4 bedroom homes utilizing septic systems with leach lines and septic pits. 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 minimum 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. VIII. CONCLUSIONS AND RECOMMENDATIONS' In conclusion,the soils investigated for Parcels 1-15, 17, 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 3-feet and 25-feet willprovide r ti 4 Q � =J O`\