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I I I I I I I I I I I I I I I I I I I Spedal Environmental Clearance Worksheet City of Loveland, Colorado Page 7 H. 3. Measures to Reduce Adverse Impacts a. The dam will be designed to pass the flows of the 100 year flood (10,500 CFS) without measurable damage. In fact, with the additional freeboard created by lowering the dam 7 feet, a 300 year flood (16,000 CFS) should be passable with little additional damage. It will be constructed at the predisaster location and will have a reservoir surface area and configura- tion similar to those of the predisaster facility, This will reduce the impact on undisturbed areas of the canyon. b, Since the river bank downstream of the dam is rock, burial of the pipeline is not economically feasible. Where the pipeline is visually exposed, it wilr-be treated to blend with the ruggedness and texture of the canyon. Alternatives include: - Application of exterior paint to blend with existing rock and tree growth. - Mechanical placement of natural earth and stone cover suitably rip-rapped to prevent erosion. - Placement of textured pre-cast concrete panels over the pipe and anchored into the canyon wall. c. The power plant will be reconstructed at the predisaster location in the Viestanz-Smith Mountain Park approximately 1.6 miles downstream of the dam. Aesthetically it will be less obtrusive than the old power plant, which was located near the center of the canyon, since it will be smaller, lower and tucked against the south bank of the park. The building will be outside of the 100 year floodway. Its facade will be constructed with natural stone places on a concrete frame to harmonize with the existing recreation structures within the park, d. In order to reduce the inconvenience to automobile traffic as much as possible, the dam construction operations will be closely coordinated with the Colorado Division of Highways, It is planned to schedule the necessary construction of the north abutment of the dam with the raising of the high- way so that both will occur concurrently. This will be accomplished with attention to the minimum possible disruption of traffic, e. Construction crews and the construction inspectors will be alert for archaeological remains. If uncovered, the State archaeologist's office as well as cognizant local officials will be notified immediately. A reasonable effort will be made to allow for examination and removal, however not to the extent of delaying or increasing the cost of construction. f. Settlement ponds will be constructed downstream of the work site to control turbidity in the stream, The contractor will be required to meet State and Federal water pollution standards and tests will be performed on a daily basis to insure compliance with these standards.