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<br />" <br /> <br />~. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Ridges Basin Dam ~ The overall increase in the cost estimate for the Ridges Basin Dam <br />feature including nonccontractcosts is $65.5million: The estimated field costs of constructing <br />the dam component increased by $33.6 million. This increase in cost estimate forthe dam <br />component includes the EDP 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 significantlyincreased 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 proposalincludes an agreement <br />between RecIamation 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 managernent <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 maj or item showing increased, <br />estimated costs is the relocation of Williams Gas Line which includes a route location requiring a <br />section 'ofhorizontal directional drilling, increased right~of-way requirements, and mitigation of <br />visual impacts on Carbon Mountain. . <br /> <br />. . <br />. . <br />. . <br />.' . <br />Durango Pumping Plant - Ofthe approximately $52 million increase, the most <br />significant increase ($42.7 million) is within the structure itself., The original estimate missed the <br />type of mate rial to be excavated, bedrock versus common, and significantly underestimated the <br />size of the plant as well as thequantity of material to be excavated for the plant and the inle.t . <br />channel. Accessory electrical equipment appears to beanother.item that was underestimated, <br />$4,9 million. These total estImated costs also.include the EDP as well as $2,5 million for' <br />security items. Based on design data a.t 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 waterstrearns, one of which is contaminated from the UMTRA uranium tailings. <br />Adjustments made to improve the visual esthetics accounted for about $200 thousand ofthe <br />increase cost estimate of $53 million. . <br /> <br />Ridges Basin Inlet Conduit - The most significant increase, $9.3 million, for the. <br />conduit itself appears to involve anoriginal estimate that significantly underestimated the <br />amount of excavation required due to the relomition 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 />. . <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 asthe 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 />'Perman'ent OperatIng FaCilities - The currerit estimate includes the $:2,5 million cost of <br />an O&M building that was riot included in the original estimate. <br /> <br />4-3 <br /> <br />J <br />