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I I I I I I I I I I I I I I I I I I I , . J1)1:26 2. SCOPE 2.1 Study Area and Size Range The sites studied consi st of the two preselected damsites at Lake Avery and Powell Park plus at least two damsites within the boundaries of the upper White River Basin designated in HB 1102. Plate 1 presents the study area and indicates the locations of the sites initially examined. The specific loca- tions of the dam axes were selected after examination of the storage charact- eristics of the resulting reservoirs and the surficial geology of the project area. Due to the wide range of potential reservoir capacities that could ultimately be required, the study examined the site geotechnical characteristics for dams impounding 50,000 to 300,000 acre-feet at all mainstem sites and 20,000 to 60,000 acre-feet at the off-channel site of Lake Avery. 2.2 Study Activities The fo11 owi ng is a short descri pti on of the work tasks contai ned in the contract between r~orri son-Knudsen Engi neers and the State of Colorado that served to define the Scope of Work for the White River Geotechnical Study. Task 1 - Data Review: Review previous work done in the White River Basin, including the Yellow Jacket Study, the White River Study, studies by the USBR and other reports by the U.S. Geological Survey, private individuals and compani es. Task 2 - Aerial Surveys and Topographic Mapping: Take aeri a1 photographs and prepare topographic maps at a scale of one inch to 500 feet, with 10 foot contours for the project area and at a scale of one inch to 100 feet, with five foot contours for each damsite studied. 2-1