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July 1993 -3- 923-2515 <br />2.0 GEOLOGIC FIELD INVESTIGATION PROGRAM <br />James Cremeens, a Golder engineering geologist, conducted the geologic field investigation <br />program in the study area between October 4 and October 7, 1992. <br />The study azea, shown on Figure 1, is defined as follows: <br />- Middle and Lower Grassy Creek from sec. 15, T.5 N., R. 87 W. to the <br />confluence with the Yampa River at sec. 16, T. 6 N., R. 87 W.; <br />- Annand Draw from sec. 17, T. 5 N., R. 87 W. to the confluence with <br />Scotchman's Gulch at sec. 33, T. 6 N. , R. 87 W.; <br />- An unnamed tributary from sec. 9, T. 5 N., R. 87 W. to the confluence with <br />Scotchman's Gulch at sec. 33, T. 6 N., R. 87 W.; and, <br />• - Scotchman's Gulch from sec. 7, T. 5 N., R. 87 W. to the confluence with Grassy <br />Creek at sec. 28, T. 6 N., R. 87 W. <br />Alluvial valley floor geologic mapping was accomplished by performing an aerial photograph <br />interpretation followed by field verification of the study area. Surface water samples were <br />collected where flowing water was present in the drainages. Groundwater samples were <br />collected from sub-irrigated fields in hand-augered borings. <br />2.1 Aerial Photograph Interpretation <br />The surficial geology of the drainages was mapped from color, stereo aerial photographs <br />provided to Golder by Peabody. These aerial photographs were at a scale of 1:12000 and were <br />dated July 1988. The aerial photograph interpretation was compiled on the U.S. Geological <br />- Survey, Mount Hams 7.5 minute topographic quadrangle. <br /> <br />Golder Associates <br />