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Joseph Olson D.B.A. Rusty Olson's--Soil and Percolation Testing Joseph J. Olson--MPCA License 4 810 11481 Riverview Rd. NE, Hanover, MN 55341 (763) 498-8779 Fax (763) 498-8290. May 11, 2022 Garrett Gronberg 65 Stubbs Bay Road N. Orono, Hennepin County This on-site Sewage Treatment System is designed add a two-bedroom system and use the existing three-bedroom system to make a Type I five -bedroom system in accordance with the Minnesota Pollution Control Agency Chapter 7080 and local ordinances. The existing house is to be removed and a new house built. There is not enough area to add to the three-bedroom system so a new separate two-bedroom system needs to be installed. The rock beds elevations will be within one tenth of a foot of each other. Drain back can not be achieved to the new two-bedroom rock bed therefore. The supply line must be laid as a force, main below the frost line. It must be insulated at the lift station and where it comes up to the manifold. The existing three-bedroom mound system is compliant to Chapter 7080 the rock bed has a 2.8 foot separation to the periodically saturated soils. The tanks need to be pumped and certified. The periodically saturated soils for the new system were located at 12 inches (mottled soil). Due to the periodically saturated soils, a pressurized mound system with 6 inches of rock will need to be installed to treat the septic effluent. The bottom of the treatment area must be located at least 3' above the saturated soils. This system is designed with 6 inches of rock. The existing septic tanks must be certified to be used. If they can be used the risers must be replaced. If the tanks need to be replaced a new 1500 -gallon combination septic tank needs to be installed. There is no lift in the basement or a garbage disposal in the new house All tanks need to be insulated if there is less than two feet of cover over the top of the tanks. Clean outs must be installed on the end of the laterals for maintenance. There are some large landscape rocks that will need to be removed with the back hoe before construction of the system. The existing lift station may be used if it is compliant. If not a new 1250 -gallon pumping chamber will need to be installed to lift the effluent to the treatment area. The power supply and switches must be located outside the manhole and pumping chamber in a weatherproof enclosure. A warning device must be installed with light and sound devices; this is in case of a pump failure. A flow measurement device must be installed. Including but not limited to a water meter, event counter, running time clocks or electronically controlled dosing, Keen all heavy a ui ment off of the ra osed treatment areas before durinsE and after construction. The area around both sites must be fenced off by the contractor before any construction begins. With proper installation and maintenance, this system should have no problem in treating septic effluent effectively. Nothing other than gray water, (laundry, showers, etc.) Human water and toilet tissue should be disposed of into the septic tanks. Iron filters and large volume water treatment systems cannot go into the septic system. Garbage disposals are not recommended. Additives must not be used they may cause harmful damage to your septic system. It is recommended that you pump the septic tanks every two years. Sincerely, Joseph J. Olson =P11C A110.0VI11