09-26-2016 Council Packet - Laserfiche WebLink

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REQUEST FOR COUNCIL ACTION DATE: September 20, 2016 ITEM NO: 5 Department Approval: Administrator Reviewed: Agenda Section: Name Adam Edwards ATE Y"-4 Public Works Director/ Title Public Works Director/City Engineer City Engineer's Report Item Description: Ferndale Road West Drainage Study List of Exhibits A- Email Petition B- Map of Area C- BMI Proposal 1. Purpose. Gain Council's decision on whether to pursue a drainage study to determine the feasibility of lowering a culvert in the vicinity of Ferndale Road W. 2. Background. Residents of Ferndale Road West and Shoreline Drive have reported concerns of high water in the wetlands on their properties. Since the original concerns were brought forward, Public Works has cleared all of the existing draining structure and replaced the culvert that crosses West Ferndale Road. The most recent request (Exhibit A) is related to the final culvert in the drainage system. This culvert controls the water level in the adjacent holding pond and the upstream wetlands. While it is unlikely that we would be allowed by the Corps of Engineers or Watershed to lower the culvert; we may be allowed to upsize the culvert which could impact the high water level. 3. Considerations. a. Changing the elevation or capacity of this culvert would require multi agency approvals. b. The water level difference on each end of the culvert was 2.25" when measured on August 24`h, 2016. c. The culvert is in good condition and appears to be functioning as designed. 4. Cost. The cost of the study is not to exceed $7000. Should the study show it to be appropriate and permitting agencies authorize the upsizing of the culvert, the cost for replacing the culvert would be $5000410,000. 5. Funding. The study/project could be funded from the Storm Water Fund. 6. Recommendation. I recommend that the City undertake the drainage study but with the understanding that it may show that benefits for alteration to the culvert do not outweigh the costs. The study itself will have value in that the City will gain a better understanding of the subject drainage area. COUNCIL ACTION REQUESTED: Decision on whether or not to proceed with the Ferndale Drainage Study.