HYDRO24368 - Laserfiche WebLink

Home Browse Search

r <. Chimney Rock Mine A hydrologic monitoring program was implemented at the Chimney Rock Mine located 20 miles southwest of Pagosa Springs, Colorado, in October 1980. This program currently consists of three surface stations located on Stollsteimer Creek which flows adjacent to the mined areas. The results of monitoring activities for the period of June 1991 are summarized in the following paragraphs with summary data sheets attached. Surface Water Monitoring Surface water monitoring was conducted at three locations on Stollsteimer Creek (S-1, S-2 and S-3). Flow conditions were average for this season of the year. Fiow measured on Stollsteimer Creek range from 9.35 cfs at S-2 to 7.93 cfs at S-3. Crest gauges examined at the three stations indicated 1.10 feet at station S-1, 2.00 feet at S-2, and 1.10 feet at S-3. Water quality samples were collected at each of the three surface stations during the June sampling. The water is classified as a mixed calcium-magnesium/sulfate-bicarbonate water with relatively low concentrations of metals and mineralization. Water chemistry was consistent with previous samp]ings. No oil and grease was found in any of the surface water samples. A spring and seep survey was conducted on March 28, 1991, in the area of the mine pits and surface disturbance area. A small seep was observed in the reclaimed area approximately at the rock underdrain location out of the east pit. Several other seeps were noted along the stream bank of the AVF area near surface station S-2. The same seep in the rock underdrain area was observed again during the June sampling. Groundwater Monitoring During August 1991, all groundwater monitoring wells were reclaimed. Prior to reclamation, water samples were obtained from wells W-9, W-10, and W-16. Sample results are consistent with the previous sampling conducted in September 1990. Alluvial wells W-1 and W-5 were dry. No analyses were conducted at wells A-1, W-6, W-7, W-17 and W-18.