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MEMORANDUM DATE: January 15, 1997 TO: Joel Hanson, Scott Tangen FROM: Paul Heuer RE: Arcade Street - Ditch 7A Improvements FTT,F 37231 Bonestroo Rosen NEM Anderfik & Associates Engineers & Architects INTRODUCTION We are writing to provide you with information regarding the costs related to the Ramsey - Washington Metro Watershed District's County Ditch 7A Improvement Project. We have been working with the District in developing a drainage plan that will most efficiently accomplish the following: 1) Provide drainage to Arcade Street, 2) Decrease the flooding problems that have been experienced in the WestwindfWindrow area, 3) Drain the ditch dry from the pond south to Labore Road during 10 -year storm events or less, and 4) Allow for lawns along the ditch from the pond south to Westwind to be mowed. Subsequent to completing this improvement project, the District plans to turn over ownership and maintenance to the City of Little f'anada. DESCRIPTION The proposed drainage plan calls for 27" storm sewer approximately 10 to 13 feet deep beneath Arcade Street faun Labore north to a point halfway between Westwind and Windrow (see attrhed concept drawing). Frain here, the storm sewer would be extended east to Ditch 7A. At this point, storm sewer would be extended south to Westwind and east and north to Windward. Catch basins would be installed at various locations to drain the ditch dry. Although we are unable at this time to determine the condition of the culverts crossing Westwind and Windrow, we have assumed that they should be replaced as part of this work. Given all of the frost heave movement observed, it is likely that pipe joints are separated or broken. Replacing these culverts would also facilitate the storm sewer and regrading work being planned. We have spoken to seven of the nine property owners affected by the proposed storm sewer from Arcade to Ditch 7A and have received somewhat favorable comments. Four owners are in favor, two owners are neutral, and one owner is against it. The owner who is against it (843 Westwind) states that he is "more against it than for it, but not 100% against it ". He has no drainage problems, and therefore would rather not be bothered with construction in his backyard. COSTS The District had budgeted approximately $90,000 for a "maintenance" project in 1997. Brad Lindaman of Barr Engineering estimates the total project cost of the District's work at approximately $160,000. This includes all storm sewer throughout the ditch and to Arcade, in addition to the ditch cleaning and culvert replacement beneath driveways that was planned. He feels that $160,000 is the limit of what the District will wish to contribute to this project. Brad did not include the following additional costs, presumably because the District would not be willing to pay for them: PAGE 9