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<br />300 Big Island Septic System Design <br /> <br /> <br /> <br />2 <br /> N:\Technical\2005\01\2017\300 Big Island Design Report.docx <br /> <br /> Final Treatment – Effluent is filtered through an effluent filter and pumped to a <br />gravity fed drain field. As the effluent trickles down into the soil biochemical <br />processes remove harmful viruses and bacteria. <br /> <br />6. Description of Treatment System – See Figure 1 and design sheets in Appendix C for <br />additional detail. Contractor can select equivalent products to those described below if <br />they meet the requirements of local ordinance, MN Rules Chapter 7080, designer <br />approval, and owner approval. <br /> <br /> Septic Tank – Proposed: 1,000 gallon Infiltrator® IM-1060 septic tank. Inlet and <br />outlet of the tanks must have rubber fittings to create watertight seals. <br />Contractor to follow manufacturer installation and burial requirements. <br /> <br /> Lift Tank – Proposed: 1,000 gallon Infiltrator® IM-1060 septic tank. Inlet and <br />outlet of the tanks must have rubber fittings to create watertight seals. <br />Contractor to follow manufacturer installation and burial requirements. Tank to <br />include an effluent pump to deliver a minimum of 20 gallons per minute with a 10 <br />foot head. Use 2-inch Schedule 40 PVC for supply pipe from pump to the first <br />drop box. <br /> <br /> Septic/Lift Tank Risers – 24” diameter heavy corrugated PVC pipe. A watertight <br />seal must be created between top of tank and the each riser using a tank to riser <br />adapter and sealing the riser to the adapter with appropriate waterproofing <br />agents. Top of riser should be 1” - 3” above finished grade. <br /> <br /> Septic/Lift Tank Riser Cover – 24” diameter fiberglass cover with gasket and <br />minimum 2” of insulation. Do not bury riser cover. <br /> <br /> Drain Field – Excavate the drain field at the location depicted on Figure 1 and as <br />staked on site. Contractor can vary location slightly based on field conditions to <br />install trenches on contour. Install trenches shallow with a maximum depth of 24 <br />inches. Each trench is 28 feet long (seven chamber units in each trench). Install <br />five trenches as shown on Figure 1. Total trench length is 140 feet, or 35 <br />chambers. <br /> <br /> Install 35 Infiltrator® Quick4 High Capacity gravelless chambers at a maximum <br />depth of 24 inches. Effluent will be distributed through drop boxes. Install the <br />chambers as recommended by the manufacturer. Cover the gravelless chambers <br />with 12-18 inches of cover and slope away. Establish a vegetative cover over the <br />drain field immediately. <br /> <br /> <br />7. Limitations - Our investigation, layout, design, and recommendations are based on data <br />submitted. If conditions considerably different from those described in this report are <br />encountered, we must be notified. If proposed construction or components are <br />changed, we must be notified to evaluate the effect of the changes on the wastewater <br />system. Any changes to the design must be approved by the designer and will be <br />assessed additional design costs. If changes are made to the design without the <br />knowledge and approval of the designer the design shall be void. All construction is to