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r ONVENTIONAL SEPTIC TANKS AND GREASE TRAP INTERCEPTOR TANK ptic tanks store the accumulated sludge, scum and effluent(clear zone)volumes, which in turn fect treatment of nitrogen within the tanks. In the following calculation,the pump-out interval ctor times the QAVE times the peaking factor(PF) correlate the pump-out time interval in years with the recommended tank capacity. The peaking factor value for this project is estimated to be 4.5: PF=peak average flpwrate(Based on FM e,iW;at= 800 x 10 = 8,000 gpd =4.5 Average flowrate 1,775 gpd Septic Tank Capacity Based on Pump-out Interval of One Year: Recommended tank capacity for a potential pump-out interval of one year: 1.0(pump-out interval factor)(QAVE) x Peaking Factor(PF=4.5) = 1.0(1,775 gals/day) x 4.5 =7,988 gals Septic Tank Capacity: Restroom southwest of Kitchen =one - 1,200 gallons = 1,200 gallons Septic Tank Capacity: Men's and Women's Restrooms =three- 2,000 gallon tanks=6,000 gallons Interceptor Grease Tank Capacity: Kitchen =one - 2.000 gallon tanks = 2,000 gallons Total Tank Capacity = 9,200 gallons Detention Time: Detention Time=9,200 gal total tank capacity x 0.85 (15%volume lost to sludge/scum accumulation(d.,.i 4.5 (Peaking factor)x 1,775 gals/day(ADF) Detention Time= 1.0 days. The minimum acceptable detention time is 1.0 day. PRESSURIZED FILTER BED SIZING CALCULATIONS Base Tank Capacity= 1,200 gal. However, ADF= 1,775 gpd, therefore Calculated Tank Capacity must be determined: Calculated Tank Capacity(CTC)= 1,125 +(1,775 (ADF)x 0.75)=2,456 gallons Leachline Equivalent Requirement=(1,200 gallons BTC+2,456 ADF Clay Loam Soil Factor(SF) = 823 lineal feet of leachline (LFLL). 823 x 3.5 (Clay Loam Soil- ter Bed So' Factor)_ 2,880 sq. ft. filter bed area re uired per EHD calculations —3 330 s . specified Each Filter Bed: 5 Infiltrator Chambers wide x (2.83 ft+ 0.5 ft = 3.33 ft width/chamber x 5 = 16.67 ft N-S x 2 (2 Filter Beds)=33.3 ft wide N-S 25 Infiltrator Chambers long=4.0 ft effec chamber x 25 Chambers= 100 ft long E-W Proposed Filter Bed Area(Single Bed) 7 ft N- ide x 100.0 feet E-W length= 1,667 sq. ft. 1,667 sq. ft. x 2 Filter Bed =3 30 sq. f Filter Bed to be installed: Total Number of Chambers Required= 5 ers width x 25 Chambers length= 125 Chambers x 2 Filter Beds=250 Quick 4TM Standard hifiltrator Chambers required. Page -13- Chesney Consulting