Agenda - Council - 10/23/2012 - Laserfiche WebLink

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CC Regular Session 7. 3. Meeting Date: 10/23/2012 Submitted For: Len Linton By: Shane Nelson, Engineering/Public Works Information Title: Receive Bids and Authorize Contract for City Project #12-28 Rum River Hills Storm Sewer Improvements Background: The City experienced several significant rainfall events in 2011 which lead to many localized flooding concerns and resident complaints. Throughout that summer and fall staff worked hard at registering and responding to the calls, and evaluating the situations on an individual basis to determine whether quick fixes could be implemented (culvert obstructions, re -ditching, etc.) to alleviate the immediate concerns. This item was discussed at the Public Works Committee on August 15, 2011, and at that time staff summarized the areas of concern that were being investigated based upon citizen complaints received. The summary was presented at the meeting; which outlined the concern identified, actions steps to evaluate the concern, additional investigations that would be necessary to fully understand the situation, and recommendations for specific projects that could be implemented rather quickly and inexpensively. At that time, we classified the issues into three categories: 1. Those that required no further action. They were evaluated and corrected, or did not need correcting because the water was fully contained within a dedicated drainage & utility easement (functioning as designed). 2. Those that required additional investigation and evaluation before deciding on a long term solution, and implementing corrective actions. 3. Those that had an identified recommendation for immediate action. Throughout the winter, areas in the second category were investigated, evaluated and brought forward for approval of plans for corrective actions. The stormsewer modifications at Rum River Hills Golf Course are the latest improvement to be reviewed by the Public Works Committee and authorized for advertisement for bids by the City Council at the September 23rd meeting. Notification: As requested by public works subcommittee all residents within 700' have been notified of the pending storm sewer improvement project. Two residents called to discuss the project and the proximity of the work to their property. No residents called to oppose the project. Rum River Hills Golf Course has been a participant throughout the process and has been notified that the bids will be reviewed for award at the October 23rd council meeting. Observations: Rum River Hills Golf Club is located east of Trunk Highway 47 at 167th Avenue NW. Several areas were evaluated and summarized in the report. The golf course was platted in the early 1980's, and at that time linear drainage and utility easements were secured on the site to encumber areas where off -site stormwater was routed through the site. Many areas of the site experienced flooding concerns during the summer of 2011, and they were summarized at the May 15, 2012 Public Works Committee Meeting. A motion was made to recommend preparation of plans and specifications for storm drainage improvements at Rum River Hills Golf course. Hakanson Anderson has prepared the plans and specifications and their design was presented to the City Council on September 23, 2012. Four areas were identified as needing improvement, each was discussed in detail along with the proposed improvements. AREA 1 (Pond adjacent to Hole #1) There is a large pond along the west side of hole #1. This pond receives runoff from the area west of TH 47 and discharges through a 12" pipe. This pipe was televised in 2011 and has sags and root intrusions. Stormwater modeling indicates this pipe is undersized for the drainage area. The existing pipe runs through an area between fairways then passes under a tee box and adjacent to and traps and a green before discharging to a ditch. The existing pipe is fairly close to the property line and there are several trees that provide screening for the adjacent properties that would need to be removed. Replacement of the pipe on its current alignment would require extensive restoration and temporary relocation of the tee box. An alternative alignment was selected which will cross the fairway instead of the green and avoid the tee box. This relocation will allow for construction of a surge pond at the downstream end of the pipe which will minimize erosion. This pond will be incorporated as a water feature on the course. The main pond serves as an extended