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To: steven D. Gatlin, Public Works Director Karl P. Keel, Assistant Public Works DirectorVJ\ AL KEHR DEVELOPMENT PROJECT PONDING From: RE: Date: November 18, 1992 Al Kehr will propose a townhome development near the corner of County Road C and Dale street to the Planning Commission on December 9, 1992. Mr. Kehr is requesting a rezoning of his property from R-l to PUD. As part of his development, Mr. Kehr is required to provide stormwater detention to maintain an existing lO-year rate of runoff. Mr. Kehr has hired Sunde Engineering to prepare a plan that provides on-site ponding. with a few modifications, the design prepared by Sunde will satisfy our requirements. As an alternate solution, we have suggested to Mr. Kehr that he pursue off-site ponding. Namely, that he contribute to the construction of a treatment pond on the east side of Dale Street south of the city's leaf composting site. In the past, the city has raised concerns about the environmental impacts of the leaf site on the nature center wetland. By constructing a treatment pond south of the site, it may be possible to treat water not only from Dale Street, Mr. Kehr's site, but also from the leaf compost site. We have told Mr. Kehr that if the storm sewer that exists in County Road C and Dale Street will carry a 100-year event to the proposed ponding area, that the city would consider constructing the treatment pond and that Mr. Kehr would contribute a fair portion of the cost. Ramsey County would also be expected to contribute for their portion of the runoff. I have discussed this issue with Brian Mundstock of Sunde Engineering. He will investigate the capacity of the system in County Road C and Dale Street and communicate their findings to us. A copy of Al Kehr's site plan as well as an aerial photograph roughing out a potential pond is attached. Attachment