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Joseph Olson D.B.A. <br />Rusty Olson's--Soil and Percolation Testing <br />Joseph J. Olson--MPCA License # 810 <br />11481 Riverview Rd. NE, Hanover, MN 55341 <br />(763) 498-8779 Fax (763) 498-8290 <br />April 14, 2021 <br />Welsh Forsman Associates <br />1160 Mooney lake Drive <br />Orono, Hennepin County <br />This on-site Sewage Treatment System is designed for a Type 1 four-bedroom home in accordance with the <br />Minnesota Pollution Control Agency Chapter 7080 and local ordinances. <br />The periodically saturated soils were located at 2446 inches (mottled soil). Due to the periodically <br />saturated soils, a pressurized mound system with 6 inches of rock will need to be installed to treat the septic <br />effluent. The bottom of the treatment area must be located at least 3' above the saturated soils. This system <br />is designed with 6 inches of rock <br />All neighboring wells are greater than 100' from proposed treatment areas. <br />A 2250 -gallon combination septic tank or its equivalent needs to be installed. <br />All new tanks need to be insulated if there is less than two feet of cover over the top of the tanks. Clean <br />outs must be installed on the end of the laterals for maintenance. <br />Keep all heavy equipment off of the proposed treatment area before, during and after construction. <br />The area around both sites must be fenced off by the contractor before any construction begins. <br />A 1250 -gallon pumping chamber will need to be installed to lift the effluent to the treatment area. The <br />power supply and switches must be located outside the manhole and pumping chamber in a weatherproof <br />enclosure. A warning device must be installed with light and sound devices; this is in case of a pump <br />failure. A flow measurement device must be installed. Including but not limited to a water meter, event <br />counter, running time clocks or electronically controlled dosing. <br />With proper installation and maintenance, this system should have no problem in treating septic effluent <br />effectively. Nothing other than gray water, (laundry, showers, etc.) Human water and toilet tissue should be <br />disposed of into the septic tanks. Garbage disposals are not recommended. Iron filters cannot go into the <br />system. Additives must not be used they may cause harmful damage to your septic system. It is <br />recommended that you pump the septic tanks every two years. <br />Sincerely, <br />Joseph J. Olson <br />