Agenda - Council - 05/27/2003 - Laserfiche WebLink

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-196- Mr. Patrick T~,dgeon, Principal Planner May 14, 2003 Page 2 multiple scales of on-site retention and infiltration into the project; minimization of scour, erosion, and velocities; and directional boring, erosion control, and native re-vegetation. The proposed stormwater outfall to the Mississippi River will likely require a public waters work permit. This discussion of response on impact mitigation for the outfalt should also reference the mitigation to improve the water quality of runoff prior to discharge to the river. The DNR appreciates that proposed outlets for public waters wetland 2-670W (on-site) and Lake Itasca (off-site) will be above the ordinary high water levels and above the 100-year flood elevation for Lake Itasca; This will allow the natural storage of these basins to be utilized and permits for working in public waters will not be necessary for these two outlets. Item 13. Water Use The document accurately indicates that DNR Water Appropriation permit No. 85-6005 will need to be amended as additional wells are added to increase the municipal water supply due to the added development. It also mentions that monitoring of the surficial aquifer is recommended to determine more accurately whether there is an effect on water table by withdrawals from the Franconia-Ironton-Galesville aquifer. Some form of monitoring will likely be a requirement of the permit process. The statement on page 13-8 that the "wetlands in question experience natural drying during periods of relative low precipitation. The photographic history.., shows wetland in the vicinity of the RTC site disappearing during the mid to late 1980's which is prior to the development of the municipal wells. This same phenomenon occurs again in the mid to late 1990s and prior to the installation of wells 4 and 5," contradicts the statement on page 12-4, that "...photographic analysis showed that for the period 1981 through 1996, the acreage of wetlands remained fairly constant. Beginning in 1997, however, the acreage of wetlands visible on the aerial photographY declined sharply." The document lacks discussion of water conservation in the new development. The DNR would like to know if "low water use" landscaping would be used to minimize irrigation, as well as whether flow restrictors, watering bans, or other water conservation measures will be promoted. lrtem 14. 14/ater~Related Land Use Management District On page 14-1, paragra?h 2, sentences 1 and 3, for accuracy, we suggest the following changes: "... contains the City's DNR-conditionall¥ approved Mississippi River Critical Area Corridor/MNRR~ plan." ... required elements, which the City has met and exceeded i__Bn some respects" ... On page 14-2, paragraph 1, next to last sentence, the citation should be corrected to: "... within Chapter 6105.08"