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Values and Assumptions <br /> I= 892 g_pd x 183 d/yr(6 mos.)= 163,236 gals=total WW/yr=21,823 cu ft = 1.46 in. <br /> 4.13 Ac x 43,560 sq ft/Ac x(1 ft/12 in.) <br /> Nw =90 mg N/L <br /> d = Assume 30% due to the fine-grained soil(clay)at the soil-effluent interface as observed in the <br /> ork Paris Analysis est results. <br /> �R = 10 in/yr. <br /> Nb= Assumed to 0.1 ppm NO3 N <br /> 1.46 in/yr(90 mg N/L) 0 -0.30)+10 in/yr x 0.1 mg/L) <br /> Nr = (1.46 in/yr+ 10 in/yr) <br /> Nr = 8.1 ppm as nitrate-nitrogen (NO3-N) or 36.0 ppm as nitrate(NO3) <br /> I\,- <br /> IV. WASTEWATER DISPOSAL SYSTEM <br /> OPERATIONAL PARAMETERS <br /> Peaking factors for septic tanks vary with usage during the hour of the day and day of the week. <br /> Peak hourly rates are associated with normal working hours. The ratio of the peak day to the <br /> average day can vary from 1.5 to>5, depending upon the usage. A peaking factor of 1.5 is used in <br /> the calculation below since peak hours of use will be intermittent: <br /> Septic Tank Hydraulic Detention Time <br /> Detention Time=2000ag 1 septic tank capacity x 0.70(30%volume lost to sludge/scum accumulation) <br /> 1.5 (Peaking Factor)x 892 gals/day ADF <br /> Detention Time= 1.1 days. The minimum detention time is 1.0 days. The ADF has been calculated under <br /> worst-case scenario conditions. However,the detention time calculation demonstrates that the septic tank <br /> should be pumped at consistent intervals; e.g., every other year, or every three years depending on <br /> observed sludge/scum accumulation. <br /> Primary and 100% Replacement Leachfield Areas <br /> The lifespan of the existing,primary disposal area is unknown. It is appr ximately six years old at <br /> present. There is a possibility that the replacement area ma hay o be a ivated m the relativel <br /> near future. s is based upon lifespans of other commercial disposal system pes. <br /> Chesney Consulting <br />