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<br /> <br />Durango Pumping Plant - Of the approximately $52 million increase, the most <br />significant increase ($42.7 million) is within the structure itself. The original estirnate missed the <br />type of material to be excavated, bedrock versus common, and significantly underestimated the <br />size of the plant as well as the quantity of material to be excavated for the plant and the inlet <br />channel. Accessory electrical equipment appears to be another item that was underestimated, <br />$4.9 million. These total estimated costs also include the EDF as well as $2.5 million for <br />security items. Based on design data at the pumping plant site, the plant was rotated 90 degrees <br />to prevent excavation from encroaching with 100 feet of a fault line which prevents mixing of <br />two ground water streams, one of which is contaminated from the UMTRA uranium tailings. <br />Adjustments made to improve the visual esthetics accounted for about $200 thousand of the <br />increase cost estimate of$53 million. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Ridges Basin Dam - The overall increase in the cost estimate for the Ridges Basin Dam <br />feature including non-contract costs is $65.5million; The estimated field costs of constructing <br />the dam component increased by $33.6 million. This increase in cost estimate for the dam <br />component includes the EDF as well as approximately $2.6 million for security items identified <br />subsequent to September 11,2001. <br /> <br />. Associated Structures - Significant increases have occurred in the estimate of costs to <br />relocate the property of others within the Ridges Basin reservoir site ($28 million). The original <br />estimate for the relocation of County Road 211 does not appear to have accounted for upgrading <br />the road to current county standards, which significantly increased requirements because of <br />additional excavation and a change in location. Increased costs were not associated with the <br />proposed paving of the lower County Road 211. The current proposal includes an agreement <br />between Reclamation and the County to pave the lower part of County Road 211. Under this <br />agreement, the County would be responsible for maintenance and Reclamation would be allowed <br />to close the road during the construction season saving costs associated with traffic management <br />and safety. The cost of the paving would not exceed estimated costs for maintenance of an <br />unpaved road during the years of construction. The other major item showing increased, <br />estimated costs is the .relocation of Williams Gas Line which includes a route location requiring a <br />section of horizontal directional drilling, increased right-of-way requirements, and mitigation of <br />visual impacts on Carbon Mountain. <br /> <br />Permanent Operating Facilities - The current estimate includes the $2.5 million cost of <br />an O&M building that was not included in the original estimate. <br /> <br /> <br />Ridges Basin Inlet Conduit - The rnost significant increase, $9.3 million, for the <br />conduit itself appears to involve an original estimate that significantly underestimated the <br />amount of excavation required due to the relocation of the gas pipelines along a northern route, <br />as well as a change from 66- to 72-inch-diameter pipe because of an initial error in computing <br />hydraulic pressure losses in the pipeline and the implications of the new gas pipeline relocation. <br /> <br />Navajo Nation Municipal Pipeline - The increase of$20 million in this item may even <br />now be underestimated. The lack of design data for the pipe location as well as the lack of any <br />costs for right-of-way could lead to some significant increases in costs for this part of the project. <br /> <br />4-3 <br />