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2.7.7.1 AVF - Williams Fork River <br />~ The flood plain of the Williams Fork River is underlain in areas by <br />~" Quaternary alluvial deposits. A geologic map of the area is given in <br /> <br /> <br />Figure 2.7-2 and shows the extent of this fill material. There are <br />agricultural activities including flood irrigation practiced on the flood <br />plain (see Map M35B). Thus, this area may potentially be considered an <br />AVF, subject to its economic importance to the area. <br />The potential impacts as a result of the Trapper Mine to the Williams <br />Fork River AVF can be dismissed. Because as previously stated, the mine <br />lies on the dip slope of the Big Bottom Syncline so that surface and <br />ground-water flow are both northward. The Williams Fork River is south <br />of the mine and not hydrologically connected to the mine-plan area, thus <br />no further impacts to its alluvial aquifer need to be investigated. <br />2.7.7.2 AVF - Yampa River <br />The Yampa River is underlain by Quaternary alluvial deposits in parts of <br />its flood plain. The largest extent of this is where the Yampa River <br />crosses the Lewis Shale at the axis of the Big Bottom Syncline. Land <br />use in this area consists primarily of irrigated hayland and pasture land. <br />Hardaway et al (1977) concluded that an AVF existed here. <br />The area of the Big Bottom contains an alluvial aquifer. Agricultural <br />activities also exist in the area. This creates the potential for it to <br />be classified as an AVF. Hardaway et al (1977) have classified the Big <br />Bottom as an AVF. ICF., Inc., a Washington D.C. consulting firm, anal-_ <br />yzed the impact of the AVF provision on coal production. This study was <br />2-532 <br />