01-18-1982 Planning Packet - Laserfiche WebLink

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I EXI-ilSlT A u TO: Jeanne A. Mabusth, Zoning Administrator FROM; Michael P. Gaffron, Septic System Inspector DATE: January S, 1982 SUBJECT: Ringer Subdivision, North Willow Drive #615 i \ Summary: All proposed lots were found to ^^^e high water table , necessitating the use of mound systems. Percolation ^ upper soil profile generally were suitable for mound . . with slower rates found in deeper test holes. Slopes on tho enti site are fairly level and suited for mound systems. how and why they work and their current and future use as part of Orono’s land use management plan. The Ringer perhaps the most extensive development in Orono to date that will require all mound systems. A. Ringer Subdivision A preliminary review of the Hennepin County Soil Survey indicated extensive areas of Cordova silty clay loam and Shorewood silty clay loam as well as Leseur loam would be found at this site. These soils all would be expected to have a seasonal water table or saturation zone between 1 and 3 feet below the surface. ILtfiifafPJK Department that mound systems would be appropriate for these soil types. These are much the same soils as found in the Medina- Ilorningside area, which experience conventional trench septic system failures due to the soil conditions. In general, tne loamy topsoil characteristics for the Ringer property are suitable for proper functioning of standard pressure-mound septic systems as per Orono's Code and Design Manual. For clarity's sake I have labeled the northern most tier cf seven Jots as Block 1, the western group of six lots as Block 2, and the two lots to the southeast as Block 3. Lot 1, Block 1 Peres PBll thru PB16. Borings BBli thru BB13. Average perc rates for both primary and alternate sites are acceptable. Slopes are quite level. Saturation indications (mottling) started at 1 7 to 2.5 feet. Actual water table at 5-7' depth. A mound system should be used due to the presence of shallow saturation zones.