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4.12. Ancillary Facilities <br />The Compact Compliance Pipeline will require a number of ancillary facilities for proper <br />operation and long-term maintenance. These include: <br />• Flow meters at each well, at key locations on the various pipelines, and near <br />the river outlet. <br />• Valves to control flows in the system, provide isolation for inspection, and to <br />allow draining the pipe at low points. <br />• Pipeline proteetion devices, including air release and vacuum valves and <br />blow-off valves. <br />• Manholes and blind flanges to allow access for internal pipe inspection. <br />• A system control building and maintenance yard. <br />5.0 COST ESTIMATES <br />Estimates of probable construction costs have been developed for the preferred <br />alternative. All costs include allowances for prime contractor overhead and profit. <br />Estimated unit prices and costs for the listed major work items were derived from the <br />following sources: published and non-published bid price data for similar work; R.S. <br />Means Heavy Construction Cost data for 2006 and 2007; contacts with pipe suppfiers <br />and information from the project area; experience on similar construction projects; and <br />price quotes from local and regional suppliers and contractors. <br />The estimated construction costs include an allowance for "unlisted items" equal to 10 <br />percent of the listed items. This allowance is intended to cover costs for a variety of <br />items, which will eventually be included in a final bid schedule, but which are not <br />considered major construction items at this time. This allowance will decrease to zero <br />as project development progresses towards final design and construction bidding. <br />The sum of the listed items plus the unlisted items allowance is defined as the "Base <br />Construction Subtotal" (BCS). An allowance for the construction contractor's costs for <br />mobilization, bonds, and insurance is included as a percentage of the BCS. An <br />allowance equal to 4 percent of the BCS has been assigned to these costs. <br />The cost estimates also include an allowance for construction contingencies: <br />• Unforeseen conditions at the site or unexpected project development issues. <br />• Approximations in estimating. <br />• Integration of new and/or more detailed project information or more detailed or <br />rigorous evaluations. <br />14 <br />