The drive on 56th Avenue in Adams County should soon be just as smooth as the water that is flowing underneath it. The main water line that runs under the section of 56th Avenue between Interstate 25 and Washington Street has been undergoing repairs ever since early February 2008.On Feb. 7, 2008, a huge sinkhole about three lanes wide shut down all lanes of northbound Interstate 25 near 58th Avenue after a water pump failed, causing the water to back up and a 66-inch main underneath the highway burst.Denver water made temporary repairs to that main line and later hired BT Construction Inc. of Henderson to replace the entire conduit under 56th Avenue. The project plan consisted of removing approximately 2,300 linear feet of 66-inch prestressed concrete pipe and furnish and install approximately 2,300 linear feet of 72-inch steel pipe and various appurtenant structures. BT Construction submitted a winning bid in the amount of $1,548,915.00.Brenden Tippets, project manager for BT Construction told 7NEWS the project was "a tough one for everyone. It was a large line, very deep and very wet."Several times during the project problems arose that pushed the project completion time back.During installation of the conduit piping, it was determined that certain lengths of the water main were compromised in ways that would affect its long term performance. Denver Water determined that it was not reasonable to expect that the BT Construction could have avoided this interference. Additionally, the number of utilities in the street require that the main be replaced in its existing relocation thereby requiring the use of temporary bypass piping to maintain water service to customers in the area.In March of this year Denver Water approved additional funds to BT Construction to modify and expand the original contract the unforeseen problems were discovered. The additional work included:
Provide water storage tanks to collect and treat groundwater discharge and additional groundwater testing required by COHPE due to historical contaminants recorded through previous projects in the area. Additional manhole riser sections were required to bring a manhole to grade. Additional traffic control devices and message boards were used to inform the community of traffic impacts related to the project. The additional traffic control devices were agreed to be provided through a meeting with local business owners and Adams County. Additional work to review and replace an unknown concrete kickblock connected to adjacent pipeline. Additional work to remove the existing prestressed concrete cylinder pipe in the area crossing Washington Street. Once excavated, it was discovered that the pipe was tied together more substantially than expected. Additional work and material to change out a flange on the pipe. The plans called for a different type of flange connection than existed in the field. Provide recycled crushed concrete in the unpaved street areas and street sweeping in paved areas to alleviate concerns with vehicle tracking related to Adams County's Storm Water Management Program. Provide hotel stays for several residents directly affected by night time construction noise. The night shift of construction was not a part of the original contract."It was really a timing issue of when you can and can't work. That set everything back," said Tippets."We are ready to finish, we're just waiting for Adams County to finish a curb replacement project before we can do the final overlay and then it's finished," said Tippets.According to BT Construction, Adams County is scheduled to finish the curb work next week allowing the final overlay the week after Independence Day weekend.