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T <br /> O <br /> Ilr;°,1 <br /> Howaro R. Green Company <br /> y <br /> OAS'tnti'cFAINF S <br /> L. CONSULTING ENGINEERS Formerly MSA <br /> C'onsulting Engineers <br /> October 24, 1997 <br /> File: 801610j-0240 <br /> Mr. Steve Ach <br /> City Planner <br /> City of Elk River <br /> 13065 Orono Parkway <br /> P. O. Box 490 <br /> Elk River, MN 5530-0490 <br /> RE: RIVERPLACE ADDITION PLAT REVIEW <br /> Dear Mr. Ach: <br /> As you requested, we have reviewed the submittal package for the Riverplace Addition. This <br /> proposed plat is located on the north side of TH 10 just east of Custom Motors. The submittal <br /> package was prepared by Midwest Land Surveyors and Civil Engineers, Inc. and consis'ed of a <br /> • preliminary grading plan, preliminary utility plan, and a preliminary plat and landscape pan. All <br /> three contained revision dates of October 20, 1997. Based upon our review, comments <br /> received at the staff review meeting, and a meeting held with the developer, their surveyor, and <br /> engineer, we would offer the following comments. <br /> A. General <br /> One issue that needs to be addressed with this plat is home lowest floor elevations <br /> relative to the Elk River 100-year flood elevation. The City Floodplain Ordinance <br /> requires the lowest floor be one foot above the 100-year flood elevation. According to <br /> their plan, the 100-year flood is at 878.1. Because of their storm drainage system with <br /> two ponds and pipe connecting them, the 100-year flood could actually get further onto <br /> the property after development than before. We would suggest that all lots impacted by <br /> the 100-year flood be identified and their lowest floor meet or exceed the one foot above <br /> requirement. Currently, there are numerous lots impacted by the 100-year flood that <br /> have lowest floors below this elevation. <br /> B. Preliminary Grading Plan <br /> • The rear lots of Block 3 appear to have a drainage swale that flows from south to <br /> north, and is at less than 1% grade. 1% is the minimum grade acceptable for <br /> any overland flow. <br /> • At the south end of Block 2, near the TH 10 service road, it is unclear how <br /> • drainage will get from the side yards to the street/storm drainage system. This <br /> entire area appears to be flat. <br /> O:IPROJ\801610j1610-2306.oct doc <br /> Sail©"d 97:IT 2,66T-VE-±DO <br />