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Soil Suitability Study Addendum _ <br /> Levine & Daughter, Inc. <br /> UP-00-18 <br /> Page 2 <br /> The`average detention time in the septic tank can be determined by the formula below. _ <br /> Assumptions are that 30%of the volume is lost due to sludge and scum accumulations and the <br /> peak daily flow is 3: <br /> Detention time= 1200 gal x 0.70 (30%volume lost)= 0.93 days <br /> IF <br /> R 3 (Peaking factor) x 300 gal/day'�= <br /> The minimum acceptable detention time is 0.5 day.".Therefore, the size of the tank is adequate. - <br /> The nitrate loading factor can be assessed by using the maximum theoretical-wastewater flows <br /> based on 10 people using the septic system per day: <br /> 10 people x 30 gals/person/day = 300 gals/day x 3.79 L/gal 1,137 L/day x 103 mg NIL = 117 ' <br /> grams N/day x 260 days/yr(5 days/wk-52 wks/yr) 30 kg N/yr x 2.2 lb/kg 66 lbs. N/yr. The - <br /> following reductions in the nitrate-nitrogen loading from above (66 lbs:'N/yr) are anticipated, <br /> according to the scientific literature: <br /> Septic tank system_ removes 10%N x 66 lbs. = 60 lbs.m - _- - <br /> E Biomat formation removes 10% x 60 lbs. = 541bs. _ - <br /> Deriitrif cation in soil strata removes 10%x 54 lbs. =49 lbs. <br /> 49 lbs. N/yr_ 3.6 acres = 14 lbs. N/ac/yr total nitrogen load: <br /> We trust the information contained within this Addendum`has fulfilled the request of the <br /> Environmental Health Department. Should there by any questions,please contact the <br /> undersigned. <br /> ,aY•9�� ,{�'err _ .. - <br /> Respectfully submitted, = o <br /> No. 04:75 <br /> Expire: V,*-0/ <br /> Don Chesney, R.E.A. <br /> Os <br /> _ y <br /> 1 <br /> `TJaCCeZy Jlg research <br /> .. - i <br />