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CHIMNEY ROCK MINE 3Y:.`L'.:.1'isti::Ei2`:::m::>:~::1~'.9.'3'.3'S.::.Y.i:.G::i::ii.'wu:':Li:E ~~:.••..w.l:«:::3`:.^..::r'.::::ti.':w:w.•.uai'i:'4':32Y`."d`.::CS'.:alCiiiaM•':Yf"w'.'.m:JR:33R:::.:Y:f'iu23~i".:~2::'.'a::~:::L'::::]:.:::iw..::~i:ti~'.S:L':`:s::V:::~:;Y.:2~:.::i.':i:G::~ 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 and eight ground water wells. The results oC monitoring activities for the period of March 1989 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). Flows condition were high due to snowmelt and spring runoff. Flow was measured at Station S-3 at 142 cfs. Water at the other two stations was too high to measure. A slight crest was measured at each station. Water quality samples were collected at each of the three surface stations during the March sampling. The water is classified as a calcium/sulfate-bicarbonate water with relatively low concentrations of metals and mineralisation. A spring and seep survey was conducted on March 27, 1989 in the area of the mine pits and surface disturbance arcs. One spring was observed originating from the Stollsteimer Creek bank just downstream from surface station S-2. Flow was measured at approximately 3 gallons per minute. 1Vatcr chemistry of the spring was analyzed and found to be between that sampled in Stollsteimer Creek and Well A-1. A quarterly pond inspection was conducted on March 27, 1989. No erosional or structural problems were observed. Sediment Pond 005 is at sediment capacity and is scheduled for clcanout this spring. Department of Health NPDES sampling and reporting was conducted over the quarter with topics of the reports sent to CMLRD. Groundwater Munitnrine Alluvial ground water was monitored at wells A-1, W-1, W-5 and W-7. The deeper Fruitland Formation was monitored al wells W-6, W-9 and W-10. The reclaimed area was monitored at wall W-16. Water levels monitored in [he four alluvial wells exhibited a major increase over the levels measured in December 1988. This corresponds with the increase in surface Ilow of Stollsteimer Creek. Results of water samples collected at wells A-], W-5 and W-7 indicate similar characteristics as surface water. Well A-1 had a much higher degree of ionization over the other two 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 sodium/sulfate type water rather than acalcium/bicarbonate type. This change in water quality may be from the mining activity and seepage from the reclaimed pit located up-gradient of the well. The deeper Fruitland Formation was monitored at stations W-6, W-9 and W-10. Water level of the three wells increased over the quarter. Water quality samples were collected at stations W-9 and W-10 in March 1989. The water was consistent with previous samplings being asodium-calcium bicarbonate type with somewhat high concentrations of metal. Well W-16 in the reclaimed area exhibited a slight increase in water level over the monitoring period. Water quality can be classified as sodium/bicarbona[e-sulfate with a higher degree of ionization over the other deep wells sampled. Concentrations of iron, nitrate and ammonia were also elevated. Trace metals concentrations were low.