Hawaiian Dredging Construction Co.: Beach Walk Waste Water Pump Station August 09 www. bus- ex. com 145 much a long- term project. The team consisted of the City and County of Honolulu, owner; Hawaiian Dredging Construction Company, general contractor; Healy Tibbits, marine subcontractor; Frank Coluccio Construction Company, micro-tunneling subcontractor; Wasa Electric, electrical subcontractor; Associated Steel Workers, ironworkers subcontractor; M& E Pacific, construction manager for the City and County of Honolulu; R. M. Towill, design consultant; Yogi Kwong Engineers, geotechnical design consultant; Kai Hawaii, civil design consultant; and Ronald Ho & Associates, electrical design consultant. Action had to be taken quickly, however, because the Environmental Protection Agency had given the authorities a very tight deadline of just over three months to complete the bypass phase, by July 31, 2006. " When the team first met we knew what had to be done, but we didn't know how we were going to do it," Chang explains. " From that day we started on the design work, and it was very much design on the fly." Alongside HDCC on the team were Healy Tibbitts and Coluccio Construction Company. Roughly 5,000 feet of 48- inch HDP pipe was to be anchored along the bottom of the Ala Wai by Healy Tibbitts. Meanwhile HDCC, which was project-managing the operation, was to construct all the above- ground work: laying pipes along both sides of the canal and installing manifolds and pumps to collect the sewage from each of the manholes and pump it into the main 48- inch pipe. The demanding time schedule introduced huge constraints and challenges into the project, one of the biggest problems being sourcing materials for delivery within such a timeframe. " Procuring the HDP pipe in that quantity and size, for example, was really challenging. Nobody buys that type of pipe anymore, so we had to have it made," Chang says. " Because this order was of such a critical nature, the vendors we contacted were prepared to stop all other operations and accommodate our order- if they received it right away." Acting quickly, the Honolulu authorities authorized HDCC to procure the pipe just days after the first meeting. " This was before we even had a contract with them," Chang says. " But it was a good decision. We committed roughly $ 3 million to the order, and the pipe began to arrive just a month and a half later." By working 24 hours a day on some occasions, the bypass was opened on time. However, sourcing pumps for the operation had also been difficult, and for a while the bypass had to operate with just three of the seven pumps the authorities has asked for, the remaining four being installed when they were received. The second phase of the project was to construct a permanent underground sewer line from the original pumping station at Beach Walk, Waikiki, under Kaiolu Street and the Ala Wai Canal to a new station where it would be tied into the 48- inch HDP pipe running along the canal bottom. Beach Walk pumping station could then be brought back online, and all the temporary pipework and pumps that had been part of the original bypass and had been pumping the sewage directly from the manholes could be removed. Using micro- tunnelling technology- a process that Coluccio specialized in- the pipe was laid by tunnelling underground rather than trenching. " We built the receiving shaft while Healy Tibbitts and Coluccio built the jacking shaft. They then had to construct two tunnels between the shafts, and they had to be exactly on target." In total, HDCC laid close on 12,000 feet of pipe at a depth of about 36 feet below ground. " We also met the city's deadline of June 30, 2008, for getting the pumping station back online," Chang says. " In total, this second phase took from July 2006 to January this year." One of the factors that made this job both challenging and rewarding for HDCC was the collaborative nature of the work, and the fact that the design work progressed with the project. Meetings were held between all the members of the team each week, thrashing out operational and design issues and keeping all the stakeholders informed of progress. " As a company," Chang says, " we have a philosophy of delivering service to the owner of the project. And we operate by keeping everybody notified. This has been a great project for us. It began as emergency work, but it has enabled us to build some really good relationships with people from the City, and that is simply invaluable."
146 www. bus- ex. com August 09 With Hawaiian Electric Company's new peaking power facility on Oahu built by Hawaiian Dredging Construction, blackouts are a thing of the past, David Hendrick reports Keeping thelightson W hen President Barack Obama and his family visited his childhood homestead in Hawaii last Christmas, the island unfortunately experienced an embarrassing power blackout