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<br />I <br /> <br />e <br /> <br />e <br /> <br />e <br /> <br />Scope of Work for Consulting Services for the <br />Roaring Fork Multi-Objective Planning Project <br /> <br />April 1998 <br /> <br />A. Identify Areas and Causes of Stream Instability <br /> <br />1) Defining Stream Instability <br />Develop a methodology for determining when instability is affecting any of the <br />stream-related values, services and structures identified under the Hierarchy of <br />Issues, attached. The methodology shall include both criteria that are scientific <br />and criteria that are related to the effects of instability on the environment, on <br />people and on human communities. The methodology shall be compatible, to the <br />extent possible, with those criteria currently applied to stream stability <br />determinations by local governments or water managers. The methodology, and <br />procedures for applying the methodology, shall be easily demonstrable, applicable <br />over a broad range of conditions, and consistent with accepted standards. <br /> <br />2) Identifying Unstable Areas <br />Apply the methodology established in Task A. I), above, to the Roaring Fork and <br />Fryingpan Rivers and identify unstable areas on map(s) and through written <br />descriptions of each area. Maps shall be to a scale of at least 1 :24,000 and shall <br />show topography, major vegetation types, stream centerline and bankfull <br />dimensions, streets and highways, political subdivisions, major structures and <br />other features so as to be readily usable. Maps shall be provided in a GIS format <br />compatible with that in use in a majority of governmental jurisdictions in the <br />valley. Descriptions of unstable areas shall include dimensions, exact <br />characteristics, rate of change, factors contributing to instability, relevant <br />physical, hydrologic, geomorphic, slope or structural characteristics, and such <br />other facts and figures as may be necessary to locate and recognize the area. <br /> <br />3) Determine Causes of Instability <br />Determine what geologic, hydrologic, land use and other reasons, natural or <br />manmade, might be contributing to instability at each location noted. Distinguish <br />between likely, remote, and unlikely causes. Note circumstances in which causes <br />are not evident or readily discerned. Recommend mitigation strategies that are <br />based on accepted stabilization methods and that are compatible with the physical, <br />environmental, social and hydrologic significance of each site. Relate mitigation <br />measures to each other and suggest phasing or programmatic mitigation plans that <br />will assure that mitigation measures are fully effective and coordinated. <br /> <br />~ <br />