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<br /> <br />", <br /> <br />I <br /> <br />Colorado River water was considered by the Public Health Service <br />to be beyond the scope of this study. The Service considers its <br />findings on water quality preliminary and subject to revision upon <br />completion of comprehensive studies to be made of water supply and <br />water quality management in the Colorado River Basin. <br /> <br />The Bureau of Mines anticipates that San Miguel Project works would <br />not significantly affect underlyins mineral resources. The Saltado <br />Reservoir would inundato a number of gold placer claims. These claims <br />are believed to be of low value but some exploratory work would be <br />necessary for an accurate appraisal. Some oil or gas reserves may <br />occur in the vicinity of Saltado Reservoir and the tunnel sections <br />of the Norwood Canal. If development were found desirable after <br />project construction, it could be accomplished by directional <br />drilling from the reservoir shorelines or offsetting wells near the <br />tunnels. Several thin beds of subbituminous coal are known to exist <br />near the Radium Reservoir. . During diamond drilling for foundation <br />studies at the damsites, coal beds should be sampled and tested. <br /> <br />. <br /> <br />I <br /> <br />The total construction cost of the proposed San Miguel Project is <br />estimated to be $67,815,000 based on July 1965 prices. This includes <br />$998,000 of preauthorization investigation costs, of which $27,000 <br />were contributed funds and $357,000 were financed from the Colorado <br />River Development Fund and are not reimbursable by the project. <br />Annual operation, maintenance, and replacement costs of the project <br />are estimated to be $185,000. <br /> <br />The estimated total benefits for the project are $4,039,500 <br />(irrigation, $2,954,500; municipal and industrial water supply, <br />$790,000; fish and wildlife, $193,000; recreation, $40,000; and <br />flood control, $62,000). An economic evaluation of this proposed <br />development for a 100-year period of analysis, using an interest rate <br />of 3-1/8 percent, indicates that the estimated total annual benefits <br />of the project would exceed the average annual equivalent cost in <br />the ratio of 1.52 to 1. The ratio of direct benefits to costs is <br />evaluated to be 0.89 to 1. <br /> <br />Of the total project construction cost, $51,020,000 are allocated to <br />irrigation, $11,415,000 to municipal and industrial water, $4,198,000 <br />to recreation and fish and wildlife enhancement, and $1,182,000 to <br />flood control. <br /> <br />Irrigation water users would pay their annual operation, maintenance <br />and construction costs, which are estimated to be $121,000. The <br />construction costs allocated to irrigation ($51,020,000) would be <br /> <br /> <br />I <br /> <br />1 <br />