05-10-2006 Council Agenda - Laserfiche WebLink

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Memo - ELrcUIMG JASSOa-AT -[S TO: Mayor Blesener & Members of the City Council FROM: Lee Elfering, City Engineer DATE: May 4, 2006 RE: Resources for Child Caring Drainage Issue Concern Resources for Child Caring (RCC) expressed a concern to the City regarding the poor drainage within an existing swale along the south end of their property and the amount of street water draining to the swale through their parking lot. These conditions were creating an area of ponding water in their lot, which froze in the winter and early spring. They indicated that some employees had fallen on the ice in the winter and were injured. Background The RCC property is located at 10 Yorkton Court inside Yorkton Industrial Park North. The building was previously owned by St. Jude. St. Jude sold the property to RCC with the drainage patterns in place as they are today. The drainage swale of concern is located along the south property line between the Jackson Heights Development and the RCC lot. The drainage swale begins off of the south end of Yorkton Avenue. In addition to overland drainage from the surrounding area, this swale is also the outlet for the storm water pond for the Jackson Heights development. The swale drains to the east and discharges into a catch basin at the southeast corner of the RCC property, from which point it is piped to the storm water pond off the end of Yorkton Circle. The City files for the Industrial Park Development and surrounding area were reviewed to determine the adequacy of the storm sewer swale and surrounding storm sewer pipe system. The Industrial Park was constructed around 1980 and while no as -built information for the storm sewer system was found, the original design plans were located. In review of the plans, it appears that there were significant field changes during construction as the storm sewer system currently serving the area does not match the plan. The existing south portion of the storm system is reduced in capacity than what was originally planned. The Jackson Heights Development to the south was constructed in the 1992 or 1993 timeframe. The storm sewer system was installed very close to the design plans and conveys storm water to a pond in the northwest corner of the development. The outlet for the pond is piped to a point just east of Yorkton Avenue where it discharges into the swale between the Jackson Heights development and the RCC lot. 10062 Flanders Court NE, Blaine, MN 55449 — Ph: (763) 780 -0450— Fax: (763) 780 -0452 C:Documents and Settings\Lee■l.ocai Se111ngs \Temporary Internet files \OLK2EtMemo - 050406- CC.doc - 1 - •d Tlin aanrll eBT :60 90 SO Few