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July 1993 -2- 923-2515 • <br />]..3 Site Description <br />The Yoast property is located in Routt County, approximately seven miles south of Hayden, <br />(:olorado. The drainage sy:>tems investigated in this study flow northerly and terminate at the <br />confluence of Grassy Creek and the Yampa River. Scotchman's Gulch, Armand Draw and the <br />unnamed drainage are lower order streams that drain into the higher order Grassy Creek. The <br />study azea is underlain by the rocks of the Williams Fork Formation of the Mesaverde Group <br />and the Lewis Shale. The Williams Fork Formation and Lewis Shale are of Cretaceous age. <br />Structurally, the study area is characterized by a series of anticline/syncline pairs. The drainage <br />systems investigated for this study appear to lie within synclinal valleys. <br />1.4 Regort Organization <br />The following two sections describe Golder's geological investigation. Section 2 is a description • <br />of the geologic field investigation program. Section 3 presents a discussion of the geologic <br />alluvial valley floor mapping, including descriptions of the geologic units present. Section 3.5 <br />summarizes the findings of the geologic investigation. Sections 4 and 5 present the findings of <br />the ecological study conducted by Western Resources Development. Section 4 details the <br />methods used to characterize the ecological properties of the study azea. Section 5 presents a <br />discussion of the results of the ecological study. A summary of the entire investigation is <br />presented in Section 6. <br />• <br />Golder Associates <br />