06-16-1997 Planning Packet - Laserfiche WebLink

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Zoning File #1619 February 14r 1991 Page 2 3. 4. 5. A primary and alternate drainfield site has been defined for each lot by the site evaluator. In many cases, these sites are marginal, just meeting or in some cases partially exceeding the maximum slope requirements. Three of the eight sites identified are less than the 75* required set back from the 0.3 acre man-made pond in the center of the property. To the applicants' credit, drainfield sites were tested and defined prior to drawing the lot lines. However, the extremely steep slopes over a great portion of the property, coupled with mottled soils which indicate the need for mound systems for the entire property, severely limit the development capability of the property. Two major wetlands exist on the property, both being fairly low in the topography. The westerly wetland is about 3 acres, of which approximately 2 acres are within Lot 1. The northeasterly wetland is about 1.5 acres, of which approximately 0.3 acre is within Lot 3. There is a 0.3 acre man-made pond in Lot 2. This pond averages about 60* across and about 200* in length. While the area of the pond certainly is not dry buildable land, it does not have nearly the significance in the watershed as the 2 other wetlands. This small pond is not a City designated wetland. Staff would recommend that a Conservation and Flowage Easement be dedicated on the plat only for the 2 major wetlands. There is an issue of the drainage swale leading north from the probable pond overflow location. This swale will generally be adjacent to the proposed house site on Lot 2. City Engineer recommends that a channel be designed and constructed within the drainage easement within Lots 1 and 2, in order to direct the pond drainage in a positive manner to avoid its affecting the house site. This swale will have to take into account driveway construction for Lot 2 and staff would suggest that the driveway also be designed in conjunction with this swale.