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1 <br /> 1989 ANNUAL HYDROLOGIC REPORT <br /> ' OCTOBER 1988 THRU SEPTEMBER 1989 <br /> ' INTRODUCTION <br /> Snowmass completed reclamation of its North Thompson Creek Mines <br /> ' during 1987 . The No. l Mine was sealed during 1987 with the ex- <br /> pectation that no water would discharge from it again. The No. 3 <br /> Mine was sealed, however pipes were placed in the lowest seal to <br /> ' allow water to drain from the mine. <br /> Current monitoring requirements are shown on pages 3-61 and 3-86 <br /> ' of the Permit. During 1988 page 3-86 was revised to include a <br /> requirement to analyze the discharge from the No. 1 Mine water <br /> treatment ponds annually in June. This information is- presented <br /> in Appendix VI . <br /> This years report continues to use the same appendix numbers as <br /> prior reports . There was no information collected this year for <br /> ' Appendices I and III which formerly contained climatological data <br /> and creek flow data respectively. <br /> ' SURFACE WATER QUALITY <br /> Appendix II contains the hydrologic information gathered for <br /> North Thompson Creek. Middle Thompson Creek is no longer <br /> ' monitored. The quality information taken on North Thompson <br /> Creek, in May and September, is designed to monitor quality at <br /> the approximate high and low flow. <br /> ' The quality of North Thompson Creek showed little variation as it <br /> passed the mines this year. The September 20th sample was taken <br /> ' after a rainstorm which caused the Total Suspended Solids to be <br /> quite high. The quality was generally near or better than the <br /> pre-permit mean. <br /> GROUND WATER QUALITY <br /> ' The results of monitoring wells D-1A and D-2A which are located <br /> near the toe of the refuse pile are given in Appendix IV. D-1A <br /> is directly below the refuse pile and D-2A is 200 feet to the <br /> west of D-1A. Prior years monitoring results are summarized .by <br /> quarter to make it comparable to the current monitoring schedule. <br /> Graphs have been prepared which show quarterly water level and <br /> ' conductivity measurements for both wells. The water level <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-1A' s conductivity is <br /> 1 <br />