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C~IDVINEY ROCg 11ZINE <br />A hydrologic monitoring program was implemented at the Chimney Rock Mine located 20 miles <br />south~vcst of Pagosa Springs, Colorado in October 1980. This program currently consists of three surface <br />stations and eight ground water wells. The results of monitoring activities [or the period of September 1989 <br />arc summarized in the following paragraphs with summary data sheets attached. <br />Sl1RFACE WATER MONITORING <br />Surface water monitoring was conducted at three locations on Stollstcimer Creek (S-1, S-2 and S-3). <br />Flows condition were et record low conditions due to lack of rain. Flow was measured at 0, 1.14 and 0.95 <br />cfs for Stations S-1, S-2 and S-3, respectively. No crest measurements were recorded at any of the three <br />stations. <br />Water quality samples were collected at each of the three surface stations during the September <br />sampling. The water is classined as a calcium/sulfate-bicarbonate water with relatively low concentrations <br />of metals and mineralization. Mineralization was increased over previous samplings due to the low flow <br />conditions. The sample collected at S-2 also exhibited higher concentrations of dissolved solids, contributed <br />primarily by sulfates. <br />A quarterly pond inspection was conducted on September 29, 1489. No erosional or structural problems <br />were observed. Department of Health NPDES sampling and reporting was conducted over the quarter with <br />copies of the reports scot to CMLRD. <br />Grnnndwoter Monitoring <br />Alluvial ground water was monitored at wells A-1, W-1, W-5 and W-7. The deeper Fruitland Formation <br />~~:~s monitored at wells W-6, W-9 and W-10. The reclaimed area was monitored at well W-16. <br />1Vater levels monitored in the four alluvial wells exhibited a decrease over the levels measured in June, <br />1959. This corresponds Huth the decrease in surface [low of Stollsteimer Creek. Results of water chemistry <br />analyses at wells A-1, W-5 and W-7 indicate similar characteristic as surface water. Well A-1 exhibited a <br />sodium/bicarbonate sulfate type water rather than acalcium/bicarbonate type. This change in water quality <br />may be from the mining activity and seepage from the reclaimed pit located up-gradient of the well. Well <br />A-1 still had a much higher aluminum concentration. <br />The deeper Fruitland Formation was monitored at stations W-b, W-9 and W-10. Water level of the <br />three wells decreased over the quarter. Well W-6 was dry. The water quality was consistent with previous <br />samplings being asodium-ralcium/bigrbonate type. <br />Well W-16 in the reclaimed area exhibited a lower water level from the June, 1989 monitoring period. <br />\Vatcr quality can be classified as sodium/bicarbonate. Concentrations of iron, nitrate and ammonia were <br />also elevated. Trace metals concentrations were low. <br />