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� ' R' <br /> . � <br /> ' , S�P TES TING� �l Y C. Steven B. Schirmers • MPCA Cert.No. 627 <br /> 951 Katydid Lane NE • St. Michaei, MN 55376 • (612) 497-3566 <br /> FAX (612) 497-5011 <br /> State License #394 <br /> February 7, 1997 <br /> Burch Cabin <br /> 380 Big Island <br /> Larsen Cabin <br /> 370 Big lsland <br /> Orono, Henn. Co., MN <br /> A site evaluation was completed at these properties for the existing on-site sewage <br /> treatment systems. The existing tanks 8� or systems are located lower than the flood <br /> plain elevation 931.5 of Lake Minnetonka and are in saturated soil (mottled soil). <br /> Mottled soil was found at the surface to 6" below the surface. These systems are <br /> classified as failed and are in non-compliance according to Minnesota Chapter 7080 and <br /> local ordinances and wifl need to be replaced. <br /> This On-Site Sewage Treatment System is Designed for a Type 3, three bedroom cabin <br /> (Burch) = 218 gal/day & a Type 3, four bedroom cabin (Larsen) = 256 gal/day totaling <br /> 474 gal/day, in accordance with the Minnesota Pollution Control Agency Chapter 7080 <br /> and local ordinances. <br /> The soils on this site are SCS soils mapped - HbC - Hayden loam. To adequately treat <br /> septic effluent, a Standard Gravelless Trench System (cluster) for both cabins may be <br /> installed west of the Larsen cabin at the top of the slope approximately 30' above the <br /> lake. No seasonally saturated soils were present to a depth of 96". This area is very <br /> limited and appears to overlap the property line of 390 Big Island. A certified survey <br /> must be completed locating the property lines & cabins 370, 380 & 390. An easement <br /> agreement will be needed for the Larsen & Burch cabins & also for 390 Big Island if the <br /> survey verifies the system will overlap the property line. The agreement will require a <br /> maintenance schedule for maintaining the tanks, pumps, electrical costs, etc. A water <br /> meter will need to be installed at each cabin to monitor daily water use and to be <br /> recorded with each property. Due to the high water table & flood plain, the tanks will <br /> need to be located at a higher elevation. This will require a sewage ejector system at <br /> each cabin which will include a water tight ejector basket which will pump sewage to the <br /> tanks with the supply line having back drainage. The ejector basket will require service <br /> at the end of the season prior to winter freeze up or be located in a heated area to <br /> prevent freezing. Service would include removal of effluent & pumps. <br /> 1 <br />