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I Since the facility will operate from April through October and be completely closed the remaining winter months of each year, the septic tanks and vaulted privy must be properly managed according to Environmental Health policies. It is proposed to pump the septage out of the first septic tank at the Ski Shop at the end of the season (October) and fill the tank with water for ballast. The vaulted privy septage will also be_pumped at the n with water. Effluent in the second tank at he Ski Sha_ be,heft in the tank throu h the winter to a as ballast. Additionally, all septic tanks should be "secured" with straps dead etc. to assist in mitigating the potential of the tanks floating out of the ground. At the start of the following season (in ApriI), the ballast water will be pumped and handled as septage. It is imperative that the septic tanks and privy be certified watertight. There must be a "high water alarm" an the vaulted privy so that there is sufficient time for the pumper truck to travel to the facility for pump-out. Sufficient, stable area next to the vaulted privy must be provided for the pumper truck. Septic tanks affect the sludge, scum and effluent volumes, which in turn affect treatment of nitrogen within the tanks. Typically, the volumetric capacity of septic tanks serving commercial facilities should be equal to approximately five times the average daily flow(ADF or QAVE)• The A peaking value is normally taken to be 1.5 for commercial projects: SEPTIC TANK CAPACITY EXAMPLE: Recommended tank capacity for a pump-out interval of every year: 2.4(QAVE) x Peaking Factor (PF) =2.4(1,050 gals/day) x 1.5 = 3,780 gal tank capacity required: Two - 2,000 gallon tanks with a filter vault and dual pumps in the last chamber should be used. I DETENTION TIME EXAMPLE: Detention Time= 4,000 gal tank capacity x 0.70 (30% volume lost to sludge/scum accumulation) 1.5 (Peaking factor) x 1,050 gals/day Detention Time= 1.8 days. The minimum acceptable detention time is 24 hrs. Since there will be a kitchen at the Ski Shop, aFrea5e trap must also be installed and plumbed according to Environmental Health regulations and policies. LEACHFIELDSIFILTER BEDS The following calculations illustrate the lineal feet of leachline based upon the listed criteria: Base Tank Capacity (BTC) = 4,000 gal: Base Tank Capacity (BTC) +Average Daily Flow ` (ADF) = Calculated Tank Capacity (CTC) x Soil Factor(SF) _ 4,000 gal BTC +J.,050 gal VF = 5,050 CTC x 0.200 SF = 1_�ineal feet of leachline Several scientific studies have shown that the infiltration capacity of a soil absorption system is ` dependant primarily by the formation of the biomat and not by the permeability of the soil. The biomat is a biological, slimy substance which forms on the soil-effluent interface over time. Effluent hydraulic loading rates under equilibrium conditions range from a conservative criterion of 0.125 gal/ft2/day to 0.5 gal/ft'/day. I Vaffey Ag research