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Management Summa Metcalf Archaeological Consultants, Inc. (MAC) has completed a survey of just over 500 acres for Peabody Coal Company's Seneca II-W mine expansion. One isolated find (IF) was discovered and one previously recorded site falls within the project area. The IF, 5RT709 is not considered to be eligible for nomination to the National Register of Historic Places (NRHP). The previously recorded site, 5RT118 is a rock art and camp site and is considered to be significant. Further work will be needed at 5RT118 should the site be threatened by coal mining activities. Introduction On July 8 and 9, 1990, MAC completed an archaeological survey of approximately 500 acres for Peabody Coel Company's Seneca II-W mine expansion. Peabody plans to strip-mine coal in this area. Since this mine expansion comes under federal regulations, an archaeological survey was to be conducted in order to comply with Section 106 of the National Historic Preservation Act. The major objective of this study was to survey,. identify and record all cultural resources within the proposed mine expansion area (Figure 1). These resources would then be evaluated as to their scientific significance in terms of the guidelines set forth for eligibility to the National Register of Historic Places (NRHP). Field personnel for MAC included Ronald J. Rood as crew chief and Principal Investigator, and Judy Rau as crew member. All pertinent data on this project is on file at the MAC office in Eagle, Colorado. Effective Environment The general environment of the project area and surrounding areas has been described by LaPoint (1987) and only a summary is needed here. The project area is located in the northern foothills of the Williams Fork Mountains toward the northern end of the Southern Rocky Mountains (Thornbury 1965). Specifically, the project area is located between Dry Creek and Sage Creek, botji of which flow into the Yampa River. Geologically, the area is dominated by two formations, the Pierre shale and the coal bearing Iles Formation. Soil in the area is quite clayey and there is great variation in the overall degree of soil development and in the thickness of preserved Holocene soil. Vegetation in the project area is dominated by the Mountain-Shrub vegetation zone with aspen groves, serviceberry, and scrub oak all present. The understory is quite variable, and includes numerous grasses, Forbs, and sagebrush. Overall visibility was poor to fair across the study area. Currently the area is used For grazing and recreation.