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CIIIlVVINEY ROCK NIDVE <br />~~~, <br />A hydrologic monitoring program was implemented at the Chimney Rock Mine located 20 miles <br />southwest of Pagosa Springs, Colorado in Oaober 1980. This program currently consists of three surface <br />stations and eight ground water wells. The results of monitoring activities for the period of June 1989 are <br />summarized in the following paragraphs with summary data sheets attached. <br />SURFACE WATER MONITORING <br />Surface water monitoring was conducted at three locations on Stolls[eimer Creek (S-1, S-2 and S-3). <br />Flows were at record low conditions due to lack of rain. Flow was measured at 1.78, 1.74 and 1.72 cfs for <br />Stations S-1, S-2 and S-3, respectively. A slight crest was measured at each station left from high water early <br />in the spring. <br />Water quality samples were collected at each of the three surface stations during the June sampling. <br />The water is classified as a calcium/sulfate-bicarbonate water with relatively low concentrations of metals and <br />mineralization. Mineralisation was increased over previous samplings due to the low Oow conditions. The <br />sample collected at S-2 also exhibited higher concentrations of dissolved solids, contributed primarily by <br />sulfates. <br />_I A quarterly pond inspection was conducted on June 25, 1989. No erosional or structural problems were <br />observed. Sediment Pond 005 is at sediment capacity and is scheduled far cleanout this fall. Department <br />of Health NPDES sampling and reporting was conducted over the quarter with copies of the reports sent <br />to CMLRD. <br />Groundwater Monitoring <br />Alluvial ground water was monitored at wells A-1, W-1, W-5 and W-7. The deeper Fruitland Formation <br />was monitored at wells W-6, W-9 and W-10. The reclaimed area was monitored at well W-16. <br />' Water levels monitored in the four alluvial wells exhibited a decrease over the levels measured in March <br />1989. This corresponds with the decrease in surface flow of Stollsteimer Creek. Results of water chemistry <br />analyses at wells A-1, W-5 and W-7 indicate similar characteristics as surface water. Well A-1 exhibited a <br />I sodium bicarbonate sulfate type water rather than a calciumlbicarbonate 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-6, W-9 and W-10. Water level of the <br />three wells decreased over the quarter. The water quality was consistent with previous samplings being a <br />sodium-calcium bicarbonate type. <br />Well W-16 in the reclaimed area exhibited a stable water level from the March 1989 monitoring period. <br />Water quality can be classified as sodium/bicarbonate. Concentrations of iron, nitrate and ammonia were <br />also elevated. Trace metals concentrations were low. <br />