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<br />2.0 INTRODUCTION <br /> <br />2. 1 ~ocation of the Site <br /> <br />The Union Carbide Corporation Uravan Mill complex is located on <br />the San Miguel River, the main tributary of the Dolores River' <br />located in southwest Colorado and discharging into the Colorado <br />River in southeast Utah. (Figure 1.) The town of Uravan is <br />located in Montrose County, Colorado, approximately 50 miles <br />south of Grand Junction. <br /> <br />2.2 Methodology: Surface Hydrology and Floodway Analysis <br /> <br />Peak river flows for floods of various recurrence intervals were <br />determined by a 1 iterature sear'ch and verified for reasonable.. <br />ness. A review of past UCC reports was conducted to determine <br />previously stated flood flo\'ls and the techniques employed to <br />calculate maximum surface water elevations. <br /> <br />Using a topographiC map provided by UCC, (1" = 200' sca'le, 2 foot <br />contour interval), cross sections were prepared of the study area <br />and the various peak floodflows routed through the river valley. <br />The hydraul ic analyses were conducted using the Corps of Engineers <br />HEC-2 computer model. The following sections of this report <br />describe in detail the assumptions, techniques, results, and con- <br />clusions of the various flood profile calculations. <br /> <br />2 <br />