6.3. SR 08-16-2004 - Laserfiche WebLink

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Howard R. Green Qompany July 22, 2004 File 823960J-0240 Mr. Chris Leeseberg City of Elk River 13065 Orono Parkway Elk River, MN 55330 Re: Belmont Estates Preliminary Plat Review Dear Mr. Leeseberg: As requested, we have reviewed the revised submittal package for Belmont Estates Preliminary Plat. The revised submittal package included a preliminary plat dated 7/21/04, preliminary site development plans dated 7/21/04, storm water management plan dated June 28, 2004, and Storm Water Pollution Prevention Plan dated July 20, 2004. Prior to this submittal, preliminary plans were submitted for review. Comments from the previous submittal can be found in City Engineer, Terry Maurer's letter dated July 15, 2004. A. Grading and drainage plan The drainage calculations submitted have numerous errors and need to be revised before they can be reviewed. For example the proposed pond near the intersection of county road 12 and Nixon Circle is shown to have a normal water level of 903.5. and the proposed elevation of Nixon Circle in this area is 903.0 or 0.5 feet below the water level. The proposed storm water ponds near the south end of the site has not been modeled correctly in the drainage report. The report only shows one pond in this location not two as shown in the grading plan. Additionally the pond design, as shown on the grading plan, does not meet City of Elk River standards. Examples of design requirements not met in the design include maximum pond slope of 4:1, 10:1 bench at the normal water level, 10 foot wide access around the pond with a maximum cross slope of 2°/% 1 foot of freeboard between the HWL and the top of the berm. The ponding should be redesigned to meet all City standards and the drainage report revised to properly model the design. 2550 University Avenue West · Suite 400N · St. Paul, MN 55114 · 651/644-4389 fax 651/644-9446 toll free 888/368-4389