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Nw=62 mg N/L d = Assume 25% due to high percentage of fine-grained clay soil. R = 15 in/yr. Nb= Assumed to be 0.1 ppm NO3 N //S 32- x qS t 1-5, 1.86 in/yr(62 mg NIL) (1 -0.25)+(15 in/yr x 0.1 me/L) > S 22 Nr = (1.86 in/yr+ 15 in/yr) !G L L »o �l Nr = 5.23 ppm as nitrate-nitrogen (NO3 N)or 23.49 ppm as nitrate(NO3) LEACHLINE AND SEEPAGE PIT DESIGN The primary and 100%replacement areas are denoted on the attached Site Plan. The new 1,200 gallon septic tank is to be installed north of the new building and is of sufficient size. After the effluent gravity flows from the septic tank, it will travel to a D-box to be equally distributed between two leachlines with seepage pits at the ends. CONCLUSIONS AND RECOMMENDATIONS NLS§ 4.2. The shallow subsurface soils underlying the subject property where the existing leachlines are located and where the proposed leachlines are to be installed, reveals a relatively high clay content -2� soil material with a high degree of denitrification potential. NLS§ 4.1. The nitrate loading calculations show the resultant effluent from the entire subject property will theoretically possess a concentration of approximately 5.2 ppm as nitrate-nitrogen, (2/4) which is approximately one-half the Maximum Contaminant Level (MCL) of 10 ppm nitrate-nitrogen. NLS§ 4.2. All decentralized wastewater management systems (septic systems)will eventually fail. A reasonable long lifespan of the primary and reserve area system can be expected based on the proposed components of the septic system including the length of the two leachlines and the addition of seepage pits at the ends of the leachlines. The underlying groundwater (well water) has a nitrate-nitrogen concentration of 4ppm. In rural areas, it is recommended that bottled water be consumed for drinking and cooking purposes. Page 5 of 7 _JJ Chesney Consulting