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1 <br />' 1988 ANNUAL HYDROLOGIC REPORT <br /> ' OCTOBBR 1987 THRU SEPTEMBER 1988 <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 /> As a result of a technical revision approved during 1987, <br />' hydrologic monitoring of the area has been reduced. Current <br /> monitoring requirements are shown on pages 3-61 and 3-68 of the <br /> Permit. <br /> <br />' This years report continues to use the same appendix numbers as <br />~ prior reports. There was no information collected this year Por <br /> Appendices I and III which formerly contained climatological data <br /> and creek flow data respectively. <br /> SURFACB WATER QUALITY <br />' <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 />t Creek, in May and September, is designed to monitor quality at <br />i <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 No,l mine discharge to the Creek <br /> began in August so its impact, if any, would be apparent in the <br /> September 14th quality measurements, The September 14th sample <br />' was taken after a rainstorm which caused the Total Suspended <br /> Solids to be quite high. The quality was generally near or bet- <br />' t ter than the pre-permit mean. <br /> The September 14th sample was analyzed for copper to develop base <br />' line information since the No.l mine seepage is to be analyzed <br /> for copper and other parameters beginning in June of 1989. <br /> GROUND WATER QUALITY <br />' The results of monitoring wells D-lA and D-2A which are located <br /> near the toe of the refuse pile are given in Appendix IV. D-lA <br /> is directly below the refuse pile and D-2A is 200 feet to the <br />' west of D-lA. Prior years monitoring results were 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 />' 1 <br />I_J <br />