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October 12,2000 <br /> Job Number.LG00-312 <br /> Page 11 <br /> Mass Balance Analysis to Determine Minimum Area of Parcel Required for a <br /> Residence with Three (3) Bedrooms. <br /> Acres Maximum Denitrification 7 Deep Rain Waste level' ;Rain <br /> Allowable Result. Percolation Concentration <br /> MCL-N <br /> 0.75 10 A► -N 25% 6.79 inches 46.5 Me N 0.17 m N <br /> h acceptable average level of nitrate from a <br /> The nitrate loading analysis has shown that an accep ab Brag e . <br /> typical 4-bedroom home's septic system requires a minimum development density of about 1- <br /> acre. The analysis has shown that an acceptable average level of nitrate from a typical 3- <br /> bedroom home's septic system requires a minimurn development density of about 0.75 acres. <br /> For the nitrate loading analysis, the maximum acceptable average level of nitrate concentration <br /> used was the MCL for ddnldng water of 10 mg/1-N. The analysis has shown that over the long- <br /> term,the average concentration of percolating rain/effluent may exceed 10 mg/LN if the <br /> development density exceeds the estimates stated previously. The assumptions used in this <br /> analysis are typical in the literature and profession. <br /> The nitrate analysis has shown that for the different sizes of the proposed parcels,parcel <br /> numbers 1 through 14 exceed the minimum acreage requirement for a 4-bedroom home with <br /> septic system. The acreage of parcel numbers 15, 17, 19, and 21 exceed the minimum acreage <br /> requirement for a 3-bedroom home with septic system. These lots exceed the criteria for.3 and 4 ' <br /> bedroom homes utilizing septic systems with leach lines and septic pits. <br /> However, due to the small acreage of parcel numbers 16, 18, 20, and 22,these parcels are <br /> not suitable for use witha conventional septic system. If parcel numbers 16, 18,20, 22 were <br /> increased in size to the minimum acreage previously discussed and suitable percolating rates were <br /> measured,they would be suitable for a conventional septic systems with leach lines and seepage <br /> pits. Parcels with small acreage are not as desirable as larger parcels because they would increase <br /> the estimated development density of the area. <br /> VIII.. CONCLUSIONS AND RECOMMENDATIONS <br /> In conclusion,the soils investigated for Parcels 1-15, 17, 19 and 21 are capable of <br /> satisfactory percolation rates for use with an on-site conventional septic system. Generally thin, <br /> permeable sandy lenses were located between the depths of 3-feet and 25-feet will provide <br /> t oe� vy <br /> ' O h <br />