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SUPLMARY <br />The literature pertinent to alluvial valley floors (AVF), identification <br />methods, legislative history and hydrologic functions are reviewed. The <br />available identification methods are used to examine Trapper Mine's mine plan <br />area and adjacent areas. A brief review of the geology and the hydrology of <br />the area is made. Soils, land use and water availability are described. As a <br />result of this investigation we found no AVF within the mine plan area. The <br />Big Bottom area of the Yampa River flood plain is identified as a potential <br />AVF. The hydraulic continuity between the aquifers below the mine plan area <br />and this potential AVF is considerd to be the key factor in determining [he <br />~~ <br />impact of [he mine on the potential AVF. Two studies were undertaken [o <br />determine [he hydraulic continuity between [he potential AVF and the aquifers <br />below the mine plan area. These studies are designed to: <br />1) Quantify the contribution of ground water in the Yampa River base flow at <br /> [he Trapper Mine area; and <br />2) Determine the interrelationships between the aquifers below the mine plan <br />area and the Big Bottom area by a potentiometer study. <br />The first study concluded [ha[ [he groundwater contribution to [he Yampa River <br />vas not detectable within reasonable accuracy. The second study concluded <br />.~ <br />i <br />