12/26/1979 Council Minutes - Laserfiche WebLink

Home Search

1 1 December 26, 1979 45 of the transactions that had occurred since this plat was first presented to the Planning and Zoning Board on Feb. 21, 1979 up to the approval of this plat by the Rice Creek Watershed Board on October 24, 1979, permit #79 -58. Mr. Schumacher requested Mr. Gotwald to review the actions of the Rice Creek Watershed Board. Mr. Gotwald said the major concern was the run -off and also, the ability of the soils to contain on -site septic systems. Mr, Gotwald discussed the ponding area and the existence of a tile in the area. The current ponding is 2.6 acres giving a storage of 5,3 acres, It is larger than needed. Mr. Gotwald discussed the construction of this ponding area with the weirs and erosions controls and the plans are so laid out as to conform to the requirements of the Rice Creek Watershed Board. He emphaized that even in a 100 year storm the volume of water run -off will not change due to the construction and containment of this ponding area, Mr. Gotwald said the City should request a stamped approved plan from the Rice Creek Watershed Board. This could then be checked against the actual construction. He said theexisting tile would not be disturbed. He was asked if all the water from the streets would run into this ponding area and Mr. Gotwald said that whatever runs toward that area now will continue to do so, there will be no change in the direction of the water run -off. He presented a map showing the tile now in that land and the fact that there would not be a problem if this internal tile was disturbed, the main line would not be altered and this is the one that would effect the adjoin- ing property. In regard to the on -site sewer systems and the water table, Mr. Gotwald had marked up a map noting the types of soils in that area. Fine loamy sands predominate with a water table of 6' adjacent to Peltier Drive - this is a very narrow strip, To the East of this the water table is 2 -4'; and to the East ofthis 2 -4'; in the center and the very Eastern 4 -5'. Mr. Gotwald felt there is no problem with the percolation of the soils, the problem is with the water table. 42 acres with 29 lots - the density is approximately 1.5 acres per lot, only 6 lots facing 77th with frontage of 230' - this is not wide enough to be split in the future. A detail plan must be submitted before the final plan can be approved. Mr, Gotwald advised that a complete Engineering plan be a part of the final plat and no building permits be issued until the holding pond is constructed. This would affect all lots with the exception of the lots facing Peltier Drive. All front yards should be 1J' above the street elevation. All lots facing 77th street must have a minimum fill of 2' this would insure the required distance from drain fields and water table, The perc tests would be done after this fill is in place. These perc tests should be done by a soils engineer. All these items should be a part of the developers agreement and final plat. A part of the final plat must show all existing drail tile to insure that no drain tile is cut off - they must be removed or completely plugged. Mr. Gotwald discussed the study asked for by the Council - if this deals III with the possibility of polluting the lake - he felt that if the systems are installed according to WPC40 there should be no problem. He felt a study to include the area would be very expensive, He reoommended that instead of the City getting involved, they should ask Engineers in this business to give the City a quote on cost estimates and then determine who is to pay for the study.