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CHIMNI•JY ROCK MINE ".J. V....:'u'.~.«:'.."..S`.M:^..........~'.i.`..~..`S`d':~:"a:Y~:a~oa:R:.:...`.':.^.i'S`^~d`yS:.`.`.SZ'S(S.".'G'S~R~,`r X.'.`"^.H.'ky.^...A:iCSM6W`"4l^~`.'S~Y.^)CCnw•"ffiA:'SMF''n„#.W9:.'::k:9:::5.'a`SRb..iC?T:.. ~.CI A hydrologic monitoring program was implemented at the Chimney Rock Mine located 20 miles southwest oC Pagosa Springs, Colorado, in October 1980. This program currently consists of three surface stations and tight groundwater wells. The results of monitoring activities for the period of September 1990 are summarized in the following paragraphs with summary data sheets attached. SURrACE WATER MONITORING Surface water monitoring was conducted at three locations on Stollsteimer Creek (S-1, S-2 and S-3). Flows condition were normal Cor this season o[ the year. Flow measured at the three stations ranged from three to Cour cfs. No crest events were recorded at any of the three stations. Water quality samples were collected at each of the three surface stations during the September sampling. The water is classified as a mixed calcium-magnesium/sulfate-bicarbonate water with relatively low concentrations of metals and mineralization. No oil and grease was found in any of the surface water samples. This sampling was conducted during reclamation of the surface facilities. No effects of this activity were observed in the water quality analyses. A quarterly pond inspection was conducted on Septcmbcr 23, 1990. No erosional or structural problems were observed. Department of Health NPDES sampling and reporting was conducted over the quarter with topics of the reports scot to CMLRD. No discharges occurred during the quarter. Groundwater MnnitnrinL~ ~{ctf4, t/Pd ,P / DOM. UJP' / Alluvial groundwater was monitored at wells A-1, W-1, W-5 and W-7. The deeper Fruitland Formation was monitored at wells 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 slight decrease over the levels measured in June 1990. This corresponds with the low surface [low of Stollsteimer Creek. Results o[ water samples collected at wells A-1, W-5 and W-7 indicate similar characteristics as surface water. Well A-1 had a much higher dcgrce of ionization over the other lwo wells. Well A-1 also had much higher metal concentrations of iron, manganese and aluminum with elevated conductivity and TDS. Well A-1 exhibited a more sodium/sulfate type water. This change in water quality may be Crom the mining activity and seepage from the reclaimed east pit located up-gradient of [he well. The deeper Fruitland Formation was monitored at stations W-6, W-9 and W-l0. Water level of the three wells decreased slightly over the quarter. Water quality samples were collected at stations W-9 and W-10 during the Septcmbcr 1990 sampling. The water was consistent with previous samplings being a mixed sodium- calcium/sulfate-bicarbonate type with relatively low concentrations of metal. Water quality of well W-10 exhibited a higher dcgrce of mineralization over previous samplings. Well W-16 in the reclaimed area exhibited a slight decre;tse in water Icvcl over the monitoring period. Water quality can be classified as sodium/bicarbonate-sulfate with a higher degree oC ionization over the ocher deep wells sampled. Concentrations of iron and ammonia were also elevated. Trace metals concentrations were low.