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- -- .. . , a deeper sediment pool, contoured land for recreation development, and landscaped shallow-water basins at abandoned gravel pits. Paragraphs 3d, e, and 4: Clay deposits now being extracted at the proposed site for the south abutment of the dam should remain intact to ensure stable conditions for the structure. Mining of clay reserves just south of the active mine probably would be considered in conflict with recreational use of the facility and particularly so if intensified urbanization is triggered by completion of the project. The same is true for sand and gravel reserves and resources not only within the permanent pool and 1,950 acres of project related acquisitions but also along the channel of Bear Creek downstream to the Platte River. General comment: Even though the sand and gravel resources under consideration are not a significant portion of the total reserves in the Denver area, they are the lowest cost source of such materials for suburban portions of southwest Denver, south Lakewood, and other growing communities. Removing the materials from the construction market would force builders to use the next highest cost source. The problem is compounded because nearly all nearby commercial sources of construction materials are threatened by urbanization, recreation development, and environment protection plans. Owing to these factors, plus increasing land ,values, sand and gravel operators are moving pit sites farther and farther from the city, which inevi- tably results in higher material transportation costs and thus higher building costs. Cost-benefit computations for projects in or near metropolitan areas probably should reflect such consequences. Please send us a copy of your final statement. Sincerely yours, Qd7}~' .. O. M. Bishop, Acting Chief ' Intermountain Field Operat on Center 2