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C. PRESSURIZED FILTER BED SIZING CALCULATIONS <br /> Base Tank Capacity (BTC)= 1,200 gal. The anticipated maximum daily flow of 300 gallons may <br /> occur on any given day of the week, 365 days per year. There will be days where no wastewater flow <br /> occurs. This ADF parameter is unknown. However, the calculations are based upon the 300 gals <br /> ADF occurring seven days per week, 365 days per year. <br /> Leachline Equivalent Requirement= 1,200 gallons BTC +300 MAX ADF x 0.250 clay Soil Factor <br /> (SF)=375 lineal feet of leachline (LFLL) required. 375 x 4 (Clay Soil - Filter Bed Soil Factor) _ <br /> 1,500 sq. ft. filter bed area required. Due to area constraints, a double depth filter bed will be <br /> constructed and increased in area to 14 ft wide by 57 ft long= 798 sq ft (1,600 sq ft). The total depth <br /> of the filter bed will be 39 inches as illustrated on the Project Plans. <br /> D. DESIGN AND OPERATIONAL SPECIFICATIONS OF THE PRESSURIZED <br /> DISPOSAL SYSTEM <br /> Pump Chamber to Filter Beds: The second compartment of the third (last) septic tank will be the <br /> pump, or dosing chamber for the filter bed. Orenco BioTube® ProPackage Filter Pump Vault PN: <br /> BPP20DD with Duplex Effluent Pump System: PN: PF200511, !/2HP,20 gpm, 120 Volt <br /> contained within BioTube Pump Vault. Total effluent volume can be calculated by checking pump <br /> cycle times on the panel and also to ensure both pumps are distributing effluent equally. <br /> Laterals for the Filter Bed: Sch. 40 PVC 1.0" nominal diameter, 1/8" orifice directed at 12 o'clock <br /> with orifice shields, 5.0 ft spacing and 57 ft long. The N-S width is to be 14 ft. "Turn-ups" are to be <br /> installed at the ends of each lateral for clean-out, and contained within valve cover boxes. <br /> Monitoring of the Filter Bed: Monitoring of effluent shall be with two monitoring/inspection ports <br /> within the filter bed area, as noted on the Plan View of the Project Plans. Monitoring/Inspection <br /> tubes: 4" PVC Tee at soil/effluent interface with 4" riser extending above the soil/grass surface, <br /> with a screw type cap. <br /> The parameters and calculations for the pressurized system are found in Appendix G. <br /> Page -10- <br />