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1 <br /> <br /> measurements for the year were consistent with prior years data. <br />' The conductivity measurements were also consistent with prior <br />years, however the graphs show that well D-lA's conductivity is <br /> increasing with time and well D-2A's conductivity is decreasing <br /> with time. The pH measurements for the wells were similar to <br /> prior years monitoring. <br /> MINE FLOWS <br />' The No. 1 Mine filled to the level of the portal seals early in <br /> 1988. Water began to leak from the seals and seep into North <br /> Thompson Creek at this time. During a site inspection on April <br />' 28th seeps were noted in the vicinity oP the No. 1 mine portals. <br /> The seeps, which were obviously high in iron content, were sur- <br /> facing along the rip rap bank of North Thompson Creek and running <br /> into the creek. On April 30th excavation work was started to in- <br />' vestigate the source of and to contain the seeps. By May 6, 1988 <br /> all of the seepage coming from the No. 1 Mine portal area was <br />' contained in a french drain system and was being piped to on site <br />ponds. <br /> The 30 gallon per minute seepage continues to be treated with a <br />' sodium hydroxide solution, piped to on site ponds and discharged <br /> into North Thompson Creek. The first discharge into North <br /> Thompson Creek from the treatment ponds occurred on August 17th. <br />' Nearly all of the water flowing into the No. 1 Mine is flowing <br /> out of the mine in the form of these seeps. Measurements of the <br /> water level in the mine show that the level of water in the mine <br /> has only increased one foot since May which equates to a con- <br /> tained flow rate of less than 2 gallons per minute. A table of <br /> the No.l Mine water level measurements is presented in Appendix <br />' V. <br /> Snowmass plans to pressure grout the seals in the No.l Mine early <br />' in 1989 in order to contain the water in the mine. Assuming the <br />grouting program is successful, the No. 1 Mine will begin con- <br /> taining water again until its equilibrium level is reached. <br /> The No. 3 Mine continues to discharge water which is piped from a <br /> point source inside the mine. The mine is also filling with <br /> water. The water level in the mine is expected to reach the <br /> lower portal late in 1989. A table of the No. 3 Mine water level <br /> measurements and a graph predicting when the water level will <br /> reach the lower portal are both presented in Appendix V. <br />' MINE WATER QUALITY <br /> The quality of the No. 3 Mine discharge is measured monthly. <br /> Prior years monitoring of this discharge has been summarized into <br />' a monthly format and is included in Appendix VI. The quality of <br /> <br />2 <br /> <br />