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♦ - - a � 300 Big Island WENCK Septic System Design � . Responsive partner. Exceptional outcomes. • Final Treatment - Effluent is fiitered through an effluent filter and pumped to a gravity fed drain field. As the effluent trickles down into the soil biochemical processes remove harmful viruses and bacteria. 6. Description of Treatment System - See Figure 1 and design sheets in Appendix C for additional detail. Contractor can select equivalent products to those described below if they meet the requirements of local ordinance, MN Rules Chapter 7080, designer approval, and owner approval. • Septic Tank - Proposed: 1,000 gallon Infiltrator� IM-1060 septic tank. Inlet and outlet of the tanks must have rubber fittings to create watertight seals. Contractor to follow manufacturer installation and burial requirements. • Lift Tank - Proposed: 1,000 gallon Infiltrator� IM-1060 septic tank. Inlet and outlet of the tanks must have rubber fittings to create watertight seals. Contractor to follow manufacturer installation and burial requirements. Tank to include an effluent pump to deliver a minimum of 20 gallons per minute with a 10 foot head. Use 2-inch Schedule 40 PVC for supply pipe from pump to the first drop box. • Septic/Lift Tank Risers - 24" diameter heavy corrugated PVC pipe. A watertight seal must be created between top of tank and the each riser using a tank to riser adapter and sealing the riser to the adapter with appropriate waterproofing agents. Top of riser should be 1" - 3" above finished grade. • Septic/Lift Tank Riser Cover - 24" diameter fiberglass cover with gasket and minimum 2" of insulation. Do not bury riser cover. • Drain Field - Excavate the drain field at the location depicted on Figure 1 and as staked on site. Contractor can vary location slightly based on field conditions to install trenches on contour. Install trenches shallow with a maximum depth of 24 inches. Each trench is 28 feet long (seven chamber units in each trench). Install five trenches as shown on Figure 1. Total trench length is 140 feet, or 35 chambers. • Install 35 Infiltrator�Quick4 High Capacity gravelless chambers at a maximum depth of 24 inches. Effluent will be distributed through drop boxes. Install the chambers as recommended by the manufacturer. Cover the gravelless chambers with 12-18 inches of cover and slope away. Establish a vegetative cover over the drain field immediately. 7. Limitations - Our investigation, layout, design, and recommendations are based on data submitted. If conditions considerably different from those described in this report are encountered, we must be notified. If proposed construction or components are changed, we must be notified to evaluate the effect of the changes on the wastewater system. Any changes to the design must be approved by the designer and will be assessed additional design costs. If changes are made to the design without the knowledge and approval of the designer the design shall be void. All construction is to 2 N:\Technical\2005\07\2017\300 Bio Island Design Report.dotx