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HomeMy WebLinkAbout11-01-17 Special Council MinutesRECORD OF PROCEEDINGS Minutes of Special Meeting of DublinCity Council Meeting BARRET"T BROTHERS - DAYTON, OHIO Form 6101 November 1, 2017 CALL TO ORDER Mayor Peterson called the Wednesday, November 1, 201Y Special Meeting of Dublin City Council to order at 5:40 p.m. in Council Chambers at Dublin City Hall. ROLL CALL Present were Mayor Peterson, Ms. Alutto, Mr. Keenan, Mr. Lecklider and Ms. Salay. vice Mayor Reiner and Ms. Amorose Groomes were absent (excused). Staff members present were Mr. McDaniel, Ms. Crandall, Ms. Readler, Ms. Mumma, Ms. O'Callaghan, Ms. Richison and Mr. Hammersmith. INTRODUCTION /PUBLIC HEARING /VOTE — RESOLUTION Resolution 75-17 A Resolution Waiving Competitive Bidding and Authorizing the City Manager to Enter Into an Agreement with Capitol Tunneling for the Emergency Replacement of the Bridge Park East Block A Sanitary Sewer Line. Mr. Keenan introduced the resolution. Ms. O'Callaghan reported the following: • On October 12, staff were notified that an existing eight -inch sanitary sewer serving the Bridge Park East Block A development appeared to have a blockage. The drain lines serving the AC Marriott Hotel and The Exchange conference center appeared to be running slower, and the City was contacted to investigate. • The City immediately performed an investigation with the Streets & Utilities staff and determined that there was something blocking the line. They were not able to determine what was blocking the line, so further investigation continued. • She shared an exhibit depicting the area where the line is located, and the manhole located on the plaza between the AC Marriott and The Exchange. The line flows downstream to the roundabout, and there is a manhole located in that roundabout. The line is comprised of clay and was installed in 1978. It was also lined in 2007 by the City. It discharges into an existing 42 -inch sanitary sewer that runs from the center island of the roundabout. • Initial cleaning efforts by Streets 8( Utilities staff proved unsuccessful at removing the blockage, and therefore a bypass pumping operation was immediately implemented to bypass the flow around that line. That: operation has been in place round the block, 24/7, and will need to continue until the line is replaced. The costs for the pumping operation is outlined in the staff report, and that operation has been turned over to a contractor. • Further investigation determined that the entire sewer length has been collapsed. The traditional method of replacing that line would be to open cut the entire area from the surface. However, that would be logistically difficult; would cause extensive surface disruption; and would impact traffic. • After consulting the designer and a couple of contractors, it was determined that tunneling — also referred to as a "bore and jack operation" would be the most appropriate method to replace this line, causing minimal disruption at the surface and having minimal traffic impacts. • Staff retained IEMH&T who developed an abbreviated plan set for the replacement of the sewer, and staff also solicited a proposal from Capitol Tunneling. There are very few contractors who perform this specialized work. Capitol Tunneling was one of the contractors consulted that indicated they would have immediate availability to perform this work. • Staff has reviewed the construction estimate they have provided. The price was negotiated over a couple of meetings. Based on the existing conditions, site logistics, difficult tunneling between two existing manholes requiring a very precise operation, the construction work is estimated to cost $303,000. • Preliminary work would begin immediately upon authorization, with actual construction beginning on Monday, November 6 and concluding in mid-December. Staff recommends approval of this resolution, which waives competitive bidding and authorizes the City to enter into an agreement with Capitol Tunneling for this work. RECORD OF PROCEEDINGS Minutes of Special Meeting of Dublin City Council Meeting BARRETT BROTHERS - DAYTON, OHIO Form 6101 Held_. November 1, 2017 Page 2 of 3 She noted that Mr. Hammersmith and Mr. Garwick have spent considerable time working through this issue, identifying the problem, contacting consultants and contractors, and staff believes a good plan has been established to replace this line in a timely and cost effective manner. She thanked them for their efforts. She offered to respond to any questions. Mayor Peterson stated he is totally supportive of all of staff's efforts. His only question is whether the City knows why the line has collapsed, and after it is repaired, will they know more about the reason it collapsed? Ms. O'Callaghan responded it cannot be determined for certain. There was a lot of construction activity in and around this area due to the development, the roundabout construction, the significant fill of approximately 10 feet placed on top of this area and the construction traffic. There really is no way of knowing for certain what caused this collapse. Ms. Salay remarked that she recalls how much the level was raised for this area. Mayor Peterson asked if lining the pipes is intended to prevent seepage into the ground, or does that reinforce the structure of the pipes. Ms. O'Callaghan responded that it is primarily to prevent infiltration of water into the pipe, adding to the flow, and then exceeding capacity. Mr. Keenan asked if there was any sewage back-up to the hotel? Ms. O'Callaghan stated that the hotel and the conference center notified the City that the sewage drains were operating slowly and the City immediately implemented bypass pumping. The Exchange was hosting events on that patio, so the City moved the bypass operation to avoid that patio. Mr. Keenan asked if the bypass pumping is done above ground. Ms. O'Callaghan responded affirmatively. The sewer line that collapsed was 35 feet down in the manhole on the plaza. A pump was placed down into that manhole and pumped to a different; manhole to bypass the collapsed line. Mr. Keenan asked if traffic disruptions could occur during the repair. Ms. O'Callaghan responded there should be minimal traffic impacts during the repair work. Mr. Hammersmith added that law enforcement officers will be utilized to direct traffic and to do temporary stops of traffic as materials are brought in and out. The plan is not to impede traffic in the roundabout at all during the operations. He provided additional detail on the specifics of the traffic management. Ms. Salay asked if the City is aware of other lines in the area that may be similar clay pipes of a similar age. Ms. O'Callaghan responded that a few years ago, pipes in this area were lined — in advance of the roundabout and realignment project. This pipe collapse will prompt Streets & Utilities staff to go out and camera some additional lines in the area that would not have been lined recently. Ms. Salay stated it would be important to understand what other problems may exist in this area, given all of the development. She thanked staff for handling this in such expedient fashion and grateful that any problems were avoided for the new businesses. Mayor Peterson stated that it will be interesting, after the work is (]orae, to have ars opinion from the contractor about why this occurred. Mr. Hammersmith responded that they will not be able to determine that, because the new line will be installed 9-10 feet above the existing one, which is why the tunneling method is being used. The downstream manhole will be filled with concrete up to the level of the new pipe, so the existing pipe will be left in place. The best evidence of what occurred is the video evidence where the liner was pushed down, and the top of the pipe and pieces of clay were visible. The pipe could not be accessed from either end, which was good evidence that the collapse took place. Ms. O'Callaghan added that another benefit of installing the new pipe at a shallower location is that the cost will be lower than if they had to bore through rock to install it. RECORD OF PROCEEDINGS Minutes of Special Meeting of Dublin City Council Meeting BARRETT BROTHERS - DAYTON, OHIO Form 6101 Held November 1, 2017 Page 3 of 3 Vote on the Resolution: Ms. Salay, yes; Mr. Keenan, yes; Mr. Lecklider, yes; Mayor Peterson, yes; Ms. Alutto, yes. ADJOURNMENT TO EXECUTIVE SESSION Mayor Peterson moved to adjourn to executive session to discuss personnel matters relaYdo the appointme t of a public official. Ms.to seconded the otion. Votthe motion: ,M . Lecklider, yes; Mr. Keenan, yes; Ms. Alutto, yes; Mayor PeVerson, yes; Ms. Sal y, yes. e meeting yfas/reqonvened at 7:33 p.m. and formally adjourned. Mayor — PrEoding Wicer Clerk of Council