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