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'I I 1 Council Meeting Minutes May 12, 1992 Page 3 Public Hearina. continued Hearing was closed at 7:49 p.m. Motion by Williams, seconded by Larson, to WAIVE THE READING AND ADOPT THE RESOLUTION MODIFYING PLANS FOR DEVELOPMENT DISTRICT'1 AND APPROVING THE TAX INCREMENT FINANCING PLAN FOR TAX INCREMENT FINANCING DISTRICT '19. 5 Ayes - 0 Nayes, Motion Carried. Agenda Items: VII-3 and VII-4 - 7:53-10:10 p.m. City Engineer Les Proper said Council reviewed the feasibility study for Improvement Project 92-2, Oakwood Drive Drainage Problem, and ordered an improvement and assessment hearing. In September 1991, 389 and 391 Oakwood Drive requested correction of a drainage problem. The lots are located at Oakwood's low point and flood during rainfalls from water overtopping the curb and flowing into the low land in the back. Prior to the 1984 construction the 391 Oakwood house, drainage flowed across the vacant lot without creating problems. Approximately 25 acres along Oakwood from Haines Avenue to Silver Lane contribute drainage to the problem area. The existing system does not have adequate capacity and overflows at the low point on Oakwood. The storm sewer on Silver Lane, which the Oakwood system drains into, has sufficient capacity to handle the entire drainage area, The Oakwood storm sewer was installed with the curbing and surfacing in 1964. Staff could not find design information on the 15 inch storm sewer and cannot determine if it was intended to serve all the area draining to it. Analysis indicates the 15 inch storm sewer from 3rd St. to Silver Lane does not have adequate capacity. It needs to be replaced with a 27 inch storm sewer between 3rd St. and the low point, and a 30 inch storm sewer from the low point to Silver Lane. The 260 Oakwood complaint refers to runoff overtopping the curb at the beginning of the Sky High Drive storm sewer. The existing storm sewer has adequate capacity, but the catch basin grates are small and plug easily. To correct this, the grates would be replaced with high capacity grates. and the boulevard bermed higher to confine the water in the street. City policy is to design a system to handle a 10 year flood, and the proposed pipe will handle such an occurrence. Proper noted that an 100 year flood would cause serious flooding throughout the City and it is economically infeasible to design such a system. The Oakwood replacement storm sewer and Sky High catch basin will cost $84,000. Each lot within the drainage area is assessed a portion based on contributing area. The City will pay for the street right-of-way and Silver Oak Park. Construction would begin July 15 and completed September 15. Public Hearing TIF Dist. 1 & Dev. Dist. 19 New Brighton Lumber Report 92-107 Resolution 92-047 Storm Sewer Improvement Oakwood Drive/Silver Lane IP-92~2 Report 92-108