Laserfiche WebLink
June 13, 2006 a <br /> NOA Project Number: E05164A <br /> Table 3. <br /> F Summa of Nitrate Mass Balance Analysis. <br /> Result Acres Average Daily Effluent Concert- Leachfield Deep Percolation of <br /> (Nc)* (A) Flow(Q) (Table 1) tration(Nw) Denitrifi- Rainfall(R) <br /> F1, <br /> (mg/L-N (gpd) (tng/L-N) 1 cation(d) (Plate 9) (in.) <br /> Par el 2 ".261 /'28O 45 15% 11.69 <br /> 18.9 <br /> cei 1 1.18 428 60 15% 11.69 <br /> 15.7 <br /> * Maximum contaminant level(MCL) for nitrate in drinking water is 10 mg/L-N. <br /> 3.6 Impact of Nitrate Loading to Nearby Water Sources <br /> # Due primarily to mall pard sizes,the result of the nitrate loading balance indicates that the <br /> proposed use cool otentia/cause a buildup of nitrate in-the ground water above 10 mg/L-N <br /> over the long term. ,ccl- -' g to the Hantzsche and Ee emo e equation and approach, the ke is a <br /> " potential for a buildup of nitrates in the ground wate"18.9 /L-N on Parcel 2 and 15.7 rng/L- <br /> N on Parcel 1. <br /> P <br /> 4.0 DISCUSSION OF NITRATE LOADING RESULTSF1 <br /> 4.1 Total Nitrate Impact <br /> According to the Hantzsche and Fenne ore equa .on and approach the its a potential for a <br /> FJ. <br /> buildup of nitrates in the ground water o 18.9 m L-N on Parcel 2 esa <br /> d 15.7ng/L-N on Parcel 1 <br /> over the long term. The calculated Nc v ue of ch value is higher thn thfe drinking water_ <br /> t <br /> standard. The nitrate test in the well water indicates that this area is susceptible to leaching of r' <br /> ' nitrogen into ground water. <br /> 4.2 Methods of Mitigation / <br /> To mitigate the potential build up of nitrates in the shallow groundwater, some simple measures <br /> should be utilized o improve e retention time and <br /> aigestion of the waste water in the septic <br /> systems on each toposed parcel. To accomplish this,we would recommend installing an oversized <br /> septic tank and utilize a modified filter bed septic system for each parcel. The modified filter bed <br /> septic system should maintain five feet of separation from first groundwater and should contain <br />!' J approximatel 4 inches of loose compost or peat to pxovide_a ca_ rbon source and slow the <br /> per lation_rate._The septic systems should-be designed accordingto EHD requi'rement's. <br /> k 1 € <br /> rl 5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> 6 <br /> "00441 <br /> 11 <br />