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A hydrologic monitoring program was implemented at the Chimney Rock Mine located 20 miles southwest of Pagosa Springs, Colorado in October 1980. This program consists of three surface stations and eight ground water wells. The results of monitoring activities for January, February and March 1988 are summarized in the following paragraphs with field data sheets attached. Conditions at the site were generally under snowcover throughout the quarter. Surface Water Monitoring Surface water monitoring was conducted at three locations on Stollsteimer Creek (S-1, S-2 and S-3). Flows over the quarter exhibited base flow conditions because of cold weather and snowcover. Flow could not be measured during Janaury due to ice conditions at S-1 and S-3. Spring runoff was experienced during the March sampling. Water quality samples were collected at each of the three I surface stations during the March sampling. The water is classified as a calcium/sulfate-bicarbonate water with relatively low concentrations of metals and mineralization. The higher flow conditions have somewhat shifted the major ion balance to a sulfate rather than a bicarbonate situation. Results were similar over the three stations. 1 A quarterly pond inspection was conducted in March. No erosional or structural problems were observed, although, light snowcover was present at the time of the inspection. I Ground Water Monitoring I Alluvial ground water was monitored at wells A-1, W-1, W-5 and W-7. The deeper Fruitland Formation was monitored at wells I W-6, W-9 and W-10. The reclaimed area was monitored at well W- 16. Water levels monitored in the four alluvial wells exhibited a I general increase over each of the three monthly samplings. This corresponds with the increase in surface flow of Stollsteimer Creek. Results of water samples collected in March at wells A-1, W-5, and W-7 indicate similar characteristics as surface water.