Abstract
The San Diego County Water Authority (Water Authority) selected CH2M HILL to design, construct, and operate its new 100 mgd Twin Oaks Valley Water Treatment Plant (TOVWTP). The project includes 21 major structures built around an existing 22 million gallon reservoir on 45 acres of land. By contract, the $157 million dollar project must be designed, constructed, and operational within 30 months. This requires a “fast track” design and construction schedule, multiple pre-purchase contracts with vendors and suppliers, and separate foundation packages for many of the structures. Mass excavation and earthwork, based on the 30-percent design package, began approximately three months after receipt of the Notice to Proceed. The design is complete and construction is moving at a very rapid pace to ensure that the 100-mgd TOVWTP will be operational by April 2008 to meet regional treated water needs for San Diego County. Project Background The Water Authority is the primary wholesaler of imported water for San Diego County, distributing water to 24 member agencies that in turn deliver water to individual homes and businesses. More than 90 percent of the total water supply for the three million residents of San Diego comes from imported water supplied by the Water Authority. In the last four years, the region has experienced peak-demand conditions exceeding the available treatment capacity. These events required that treatment facilities operate above their rated capacity, reducing the reliability of water supply to San Diego. The Water Authority typically implements capital facilities using design-bid-build (DBB) procurement. However, after evaluation of DBB and the design-build-operate (DBO) procurement method, the DBO method was used to address the immediate need for additional treated water capacity in the region. The DBO procurement method was utilized for the TOVWTP for the following reasons:
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