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I I III. DESCRIPTION OF CONSTRUCTION PROCEDURES To assist in evaluating impacts to the local environment by project construction operations, a brief description of project components and expected construction procedures follows: I I I I I A. GENERAL PROCEDURES Certain construction procedures would apply to many of the component items which comprise the several plans. To reduce duplication, such general procedures will be covered hereunder. Construction features of components under Plan G are not dis- cussed hereunder since they should be covered by the EIS being prepared for the Eagle-Colorado System by the DWB. 1. Construction Access I Access to construction sites in the Homestake and Eagle Valleys would be over existing roads, Temporary construction roads would be extended from existing roads to provide access to some component items in these valleys. I I Access to construction sites within the Holy Cross Management Unit would be through tunnels bored from Homestake Valley or by helicopter. No access roads into. this Management Unit would be permitted, I- I L" 2 ~ . Q Site Clearing Clearing of construction sites would be as permitted and directed by the U. S, Forest Service. Clearing in all cases would be restricted to the minimum amount required for construction of the various flow components. Disposal of felled trees would be as directed by the Forest Service, Underbrush and slash from I I trees would generally be chipped and used as ground cover in restoration of areas scarred by construction. 3. Blasting Because of the rocky nature of the environment, blasting would be used for excavation on most component items. It would be required that all blasting comply with applicable laws, ordinances, and safety and construction code regulations. Blasting would be under the direction of experienced specialists who would hold blasts to minimum practical sizes to reduce impacts due to noise and vibration. 4. Concrete Aggregates Since the core rocks of the Sawatch Range are generally unsatis- factory for concrete aggregates, it would be necessary to import satisfactory aggregate material. It is believed that a satisfactory source exists in Homestake Valley in Section 7, Township 7 South, Range 80 West. This is the source used for aggregates for existing Homestake Dam structures. Other potential aggregate sources exist in the Pando area in the Eagle River Valley. It is probable that a concrete plant would be set up at the aggregate source and concrete hauled to the site of the work. This would result in considerable traffic on project access roads during concrete pours, particularly during tunnel lining oper- ations. 5. Restoration Of Scarred Area At the conclusion of construction operations. temporary access roads, mobilization and operations areas, parking areas, pipeline rights-of-way, diversion sites, dam sites, spoil areas, and other areas which have been scarred by construction wou ld be restored to a condition satisfactory to the U. S, Forest Service. Except in 23