08-12-2019 Council Packet - Laserfiche WebLink

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MINUTES OF THE ORONO CITY COUNCIL MEETING Monday, July 22, 2019 7:00 o'clock p.m. PUBLIC WORKS/CITY ENGINEER REPORT 11. 2019 STORMWATER IMPROVEMENT PROJECTS — COUNTRY SIDE AND OLD CRYSTAL BAY ROAD DESIGN REVIEW Edwards stated this item is to gain approval/direction on the design and associated costs of the project prior to soliciting bids. The City contracted with Bolton & Menk to conduct a drainage analysis and provide recommendations. The estimated cost to complete the project is approximately $207,000. In 2015, the City Council directed Staff to perform maintenance activities on the pipes and associated ditchways in an effort to address the nuisance flooding that occurs during times of heavy rainfall. Those ditches were again dug out in 2018. The City also assisted the homeowners' association with some pond work. In March of 2018, the City Council directed Staff to revisit the issue as part of the 2019 stormwater improvement projects. The scope of the project recommended includes replacement of the 18 -inch CMP trail crossing culvert with dual 18 -inch RCP culverts, replacement of the 18 -inch CMP south of Countryside Drive with 30 - inch RCP, replacement of the 15 -inch CMP east of Old Crystal Bay Road with 18 -inch RCP, removal of 254 feet of 18 -inch CMP north of Countryside Drive, and replacement with a ditch and 60 feet of 30 -inch RCP. The goal of the project would be a significant reduction in the amount of time there would be flooding during those rain events. Approximately 39 acres feeds directly into these pipes along with another 30 acres into the pond. The costs for the various recommended improvements are as follows: Item 1: Replace 18 -inch CMP with 2 x 18" RCP at a cost of $32,886.00. Item 2: Replace 18 -inch CMP with 30" RCP at a cost of 88,364.25. Item 3: Replace 15 -inch CMP with 18" RCP at a cost of $24,050.25. Item 4: Replace 18 -inch CMP with ditch and 30" RCP at a cost of $61,904.25. Edwards noted the total cost of all the improvements would be $207,204.75. Walsh stated at the time this group of residents initially approached the City, he was on the City Council, and that he recommended the pipes be cleaned out. At the time the pipes were not sized correctly and the philosophical question is whether the City has some responsibility to resize the pipes. Walsh commented having a flooded yard can get aggravating but that there does not appear to be any water impacting the structures. Johnson noted if they are talking about four inches of rain in a 24-hour period and it took two hours for it to drain, that might be cut in half with the improvements. The amount of money being considered seems like a lot of money to reduce an inconvenience for a rain event that does not occur on a regular basis. Crosby asked whether any of the neighbors are getting water in their basements. Edwards stated not to his knowledge and that no neighbors are present this evening. The emergency overflow is Countryside Road, which happened in 2013, but that Staff considers this more nuisance flooding. Page 4 of 10