03-19-1990 Planning Packet - Laserfiche WebLink

Home Browse Search

To; From: Date: Jeanne A. Mabusth, Building & Zoning Adminlnstrator Michael P. Gaffron, Asst Planning & Zoning Administrator March 14, 1990 Subject: #1505 Steve Wirtjes, 3085 Watertown Road - Septic Review I have reviewed the submitted septic testing information for the above referenced subdivision, and wish to make the following comments: 1. The proposed house and treatment areas for Lot 2 shown on the survey are reversed from the actual testing done by SP Testing. Actually, the house should be at the south center portion of the lot, which is a high knob. The drain- field sites actually are at the northeast quadrant of proposed Lot 2. 2. In Lot 2, both primary and alternate sites are on suitable soils and slopes, and are located in an area where flooding should not be a concern. Both sites would require a mound sewage treatment system. 3. In Lot 1, tested drainfield sites are to the north of the existing and proposed house locations, and are in a relatively low area of the property. Both of these sites were found by the site evaluator to be suitable for mound systems. However, those sites were found to have a seasonally high water table between 1 and 2 feet below the surface based on mottling, an indicator of seasonal soil saturation. While the designs meet soils criteria acceptable for mound systems, I am concerned about possible flooding in the area of these systems, given that drainage from the Carlscn subdivision to the north comes through this property. The attached topographic survey from City files (with proposed subdivision overlay) shows the proposed drainfield sites and indicates that a large portion of the front yard area is a basin area. There appears to be a ditch that drains this area generally southerly along the west lot line, uO the creek channel which bisects the property. 4. I would suspect that while topographic contours of the hill areas are fairly accurate on the file topography, the center line of the creek and its potential flood plain area are not accurately defined nor designated. That topography does not even show the ditch leading from the Watertown Road culvert along the west lot line. I think we should request the following information: