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C~-II1VIlVEY ROCK MINE <br />A hydrologic monitoring program was implemented at the Chimney Rock Mine located 20 miles southwest <br />of Pagosa Springs, Colorado, in October 1980. This program currently consists of three surface stations and <br />eight groundwater wells. The results of monitoring activities for the period of June 1990 are summarized in <br />the following paragraphs with summary data sheets attached. <br />SURFACE WATER MONITORING <br />Surface water monitoring was conducted at three locations on Stollsteimer Creek (S-1, S-2 and S-3). <br />Flows condition were extremely low for this season of the year. Flow measured at the three stations ranged <br />hom two to three cts. No crest events were recorded at any of the three stations. <br />Water quality samples were collected at each of the three surface stations during the June sampling. The <br />water is classified az a mixed calcium-magnesium/sulfate-biprbonate water with relatively low concentrations <br />o(metals and mineralization. Due to the low flow conditions, water quality resembled that of a winter or fall <br />sampling. No oil and grease was found in any of the surface water samples. This sampling waz conducted <br />during reclamation of the surface facilities. No effects of this activity were observed in the water quality <br />analyses. <br />A quarterly pond inspection was conducted on June 12, 1990. No erosional or structural problems were <br />observed. Department of Health NPDES sampling and reporting was conducted over the quarter with copies <br />of the reports sent to CMLRD. <br />Groundwater Monitoring <br />Alluvial groundwater was monitored at wells A-1, W-1, W-5 and W-7. The deeper Fruitland Formation <br />was monitored at wells W-ti, W-9 and W-10. The reclaimed area was monitored at well W-16. <br />Water levels monitored in the four alluvial wells exhibited stable conditions or a slight decrease over the <br />levels measured in March 1990. This corresponds with the (ow surface flow of Stollsteimer Creek. Results <br />of water samples collected at wells A-1, W-5 and W-7 indicate similar characteristic az surface water. Well <br />A-1 had a much higher degree of ionization over the other two wells. Well A-1 also had much higher metal <br />concentrations of iron, manganese and aluminum with elevated conductivity and TDS. Well A-1 exhibited a <br />more sodium/sulfate type water. This change in water quality may be from the mining activity and seepage <br />from the reclaimed pit located up-gradient of the well. <br />The deeper Fruitland Formation was monitored at stations W-6, W-9 and W-]0. Water level of the three <br />wells increased slightly over the quarter. Water quality samples were collected at stations W-9 and W-10 <br />during the June 1990 sampling. The water waz consistent with previous samplings being a mixed sodium- <br />plcium/sulfate-bicarbonate type with relatively low concentrations of metal. Water quality of well W-10 <br />exhibited a higher degree of mineralization over previous samplings. <br />Well W-16 in the reclaimed area exhibited a slight decrease in water level over the monitoring period. <br />Water quality pn be clazsified az sodiumPoicarbonate-sulfate with a higher degree of ionization over the other <br />deep wells sampled. Concentrations of iron and ammonia were also elevated. Trace metals concentrations <br />were low. <br />