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W-17 Deep ground water well located in the mouth of Deep Creek Canyon. The station was selected to monitor water quality and level in the Fruitland and/or Pictured Cliffs Sandstone Formations as pit development takes place in the Revision Area No. 2. W-18 Deep ground water well located in the mouth of Deep Creek Canyon. The station was selected for objectives similar to those of W-17. On January 30, 1986, the CMLRD approved a Technical Revision to reduce the hydrologic monitoring program at the site. Stations associated with the Revision Area No. 2 in Deep Creek (DC-1, W-17 and W-18) are not required to be monitored by the current program and will be resumed as development begins in that ,area. The water quality parameters of arsenic, cadmium, lead, mercury, molybdenum and selenium have also been eliminated from all stations except well W-16 located in the reclaimed. Water quality sampling of the Stollsteimer Creek alluvium was added to station A-1 and eliminated from station W-1. Frequency of sampling, depth-to- water measurements, and stream discharge measurements were not changed by this revision. The following sections of this report describe the methods and results of this revised program conducted at the Chimney Rock Mine site during 1987. Also contained in this report is a comparison of the data collected over the 1985, 1986 and 1987 I period and recommendations for future monitoring in 1988. SURFACE WATER MONITORING Monthly water surface samplings for flow were conducted at each of the three stations located on Stollsteimer Creek during the later portion of each month. Quarterly water quality samples were collected during March, June, September and December. Methods During monthly visits to each station, flow measurements were made using a Teledyne-Gurley Model 622 current meter. Measurements were made by stretching a 100 foot tape across a surveyed cross-section of the creek and utilizing the USGS six-