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Reservoir Site Characterization I Utilities and Recreational Facilities I U.S. West Communications (telephone) and Yampa Valley Electric (electricity) are the utility companies that serve the area around the reservoir. It is our understanding there are no gas, water, sanitary sewer, or cable facilities. Telephone facilities are buried along the County roads, and electric facilities are over-head scattered through-out the proposed reservoir area as shown on Figure 3-2. Telephone and electrical services will need to be disconnected and abandoned/relocated at the locations where the residential lots will be inundated. There are other relocations of telephone and electric lines that will be required at the various locations throughout the reservoir, emergency spillway route along County Road 29, and the dam site. The City of Craig maintains the recreation facilities at Elkhead Reservoir. The majority of the recreation facilities are located near the perimeter of the current reservoir staging area. Consequently, with the proposed dam and reservoir enlargements, these facilities will require relocation. - GEOTECHNICAL INVESTIGATIONS Previous Investigations Several geotechnical investigations have been conducted for Elkhead Dam dating back to 1968 when the original dam design was studied. In 1968, Engineering Consultants International, Inc. (ECI) drilled five auger holes along the then proposed dam alignment as part of a feasibility study. In 1971, additional geotechnical investigations were conducted as part of a second phase of the feasibility study (ECI, 1971; ECI, 1972); six auger borings were made along the centerline of a -second proposed dam axis, three auger borings were made for borrow explorations on the right abutment, and five borrow explorations were made in the floodplain upstream of the dam site. This study progressed to a third phase in 1973 to report on the final geotechnical investigations gathered for the design dam alignment and to discuss recommendations for the embankment design; two drill holes and six auger borings were drilled along the dam alignment, twenty-six test pits were excavated to locate potential borrow sources, four test trenches were dug along the proposed spillway alignment, and one test trench was dug in the left abutment. The current dam was then constructed using this information. In May, 1985, Morrison-Knudsen Engineers, Inc. (M-K) excavated seven test pits to locate borrow sources as part of a feasibility study on lining the spillway and downstream face- of the dam with roller compacted concrete (M-K, 1985a). In September of 1985, M-K drilled two more test holes on the left abutment as part of a study that investigated the possibility of installing a fuse plug spillway on the left abutment (M-K, 1985b). New Investigations A review of the previous geotechnical investigations was performed and additional geotechnical information was obtained for the proposed reservoir enlargement as part of the present study. Field explorations were conducted by the U.S. Bureau of Reclamation (Reclamation) between June 16 and September 28, 1993, in accordance with an investigation plan prepared jointly by Reclamation and Woodward-Clyde Consultants. Samples were 3-6