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- Mr. Byron Walker <br />PROPOSED BASELINE HYDROLOGIC SAMPLING LOCATIONS FOR <br />SOUTH TAYLOR AREA <br />May 25, 1999 <br />Page 3 <br />Ground Water Sites <br />The baseline grotmd water sampling program is limited to alluvial sites adjacent to the surface water sites. <br />Colowyo proposes [o sample field pazameters monthly and perform full suite analyses quarterly. Bedrock <br />monitoring is not proposed. There is no beneficial use of the Williams Fork formation and associated coals in the <br />area. Local ranchers use surface water or alluvial wells. Exposed ground water at the mine is derived from <br />perched zones formed by localized sandstone channels. Drill hole logs of the recoverable stratigraphic column <br />show multiple clay seams. The Trout Creek sandstone is a regional aquifer, but it is located over 200 feet below <br />the lowest coal to be mined, the I -Coal. In addition, a known bentonitic bed, known as the KM seam, is located <br />between [he I seam and the Trout Creek sandstone, precluding migration or commingling of waters between [he <br />mine and the aquifer. <br />Table 4: Proposed Baseline Alluvial Water Sites, Taylor Creek Expansion <br /> Upstream Downstream <br />West Fork Taylor Creek N.A., Headwaters MW-95-O1 (historic) <br />MW-95-0I (future) <br />West Fork Good Spring Creek A-9 29L/A2-C (historic) <br />A-10 (future) <br />Good Spring Creek A-6 (current) NGSW (current) <br />Sites identified in bold print are new locations for sampling. <br />The Map 37, Water Monitoring Sites for Permit No. CO-O19-81 is enclosed for your review and contains both the <br />current monitoring sites and the proposed sites. Historic sampling sites are also identified. <br />The southern portion of Map 10, Hydrology, includes the springs and seeps and is enclosed for your review. The <br />proposed sampling sites have been identified in green. Historic sampling sites aze also identified in pink. <br />We look forward [o heazing from you. Thank-you, in advance, for your work on this project. <br />Sincerely, <br />Kimberley A. Wolf <br />Attachments <br />cc MH Gibson <br />SR Hinkemeyer <br />C Begej - Greystone <br />