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/~ OIL VIELL ELEVA710NS~LDCATIONS Powers Elevation, Inc. ENVIRONMENTALARCHAEOIOGICAL SERVICES P.O. Boz 2812 Denver, Cobnao 502012812 Pnple 303/321-2217 Too Free 1~500~82~-2550 1.0 INTRODIICTION On September 14, 1987 Peabody Coal Company (Peabody) verbally notified Powers Elevation, Inc. (Powers) to perform a cultural resources inventory of four proposed alluvial well sites and their access roads at the Seneca II mine near Hayden, Colorado, under Purchase Order No. 17068-0260. The project includes a total of about nine acres. The wells and access roads are found in Sections 5, 17, and 18, T.SN., R.86W., and Sections 28, and 34, T.6N., R.87W., Routt County, Colorado. Figures 1 and 2 illustrate these locations. These figures are located on the Milner, and Mount Harris, 7.5', 1971 USGS topographic quadrangle maps. Two of the wells are located on land owned by the State of Colorado. Two locations are on private property. The purpose of the investigation is to allow for the consider- ation of the effect of the proposed action on cultural resources for review by the Colorado Mine Land Reclamation Division (CMLRD). The proposed project is the drilling of four alluvial water monitoring wells. The well pads will impact an area about 50 ft sq. In addition, short access roads will be built off of existing roads to the well locations. These roads will impact an area about 50 ft wide. The field work was conducted by Mr. Paul D, Friedman, M.A., of Powers on September 18, 1987, under Colorado Permit No. 87-1. All field notes and photograph negatives from this investigation are on file at the Denver office of Powers. 2.0 ENVIRONl~i'P The project area is situated within the broad Colorado Plateau physiographic region. It is located west of the Park Range, east of the Axial Basin, and south of the Yampa River, in a region broadly characterized by moderate geological downwarping. Two of the well locations are situated in Twentymile Park, a broad, open area of low rolling terrain. The two well locations in Twentymile Park are on intermittent flowing tributary drainages of Fish Creek. Fish Creek flows northwestward to meet the Yampa River. The two easternly situated wells are on Grassy Creek, which is another north flowing tributary of the Yampa River. • The project area in Twentymile Park consists of a rolling, sage covered plain, On Grassy Creek, to the northeast, A Subsidiary of Petroleum Information Corporation