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<br />1987 ANNUAL HYDROL06IC REPORT <br />OCTOBER 1986 THRU SEPTEMBER 1987 <br />' INTRODUCTION <br />' Snowmass' North Thompson Creek Mines continued to be in permanent cessation <br />during this hydrologic year. Regrading, seeding and mulching at the refuse <br />pile was co,:ipleted in November 1986. Demolition of all surface facilities <br />' and the majority of regrading at the mine site and loadout were completed <br />by the end of the 1987 hydrologic year. <br /> Technical revision TR05, Hydrologic Monitoring Reduction, was approved June <br />12, 1981. Monitoring on the refuse pile piezometers was reduced to quarterly <br /> field and water level measurements, the mine site piezometers and t he Middle <br /> Thompson Creek monitoring was eliminated and monitoring on North Thompson <br />' Creek was reduced to biannual quality monitoring. <br /> To maintain the same format for submission of this year's data, the same <br /> appendix numbers are used in this report as were used in previous reports. <br />' There was no information collected this year for Appendices I and III which <br /> formerly contained climatological data and creek flow data. <br /> <br /> SURFACE HATER QUALITY <br />' Appendix II contains the hydrologic information gathered for North Thompson <br /> Creek and Middle Thompson Creek. Flow information is no longer taken on <br /> the creeks therefore mass balance comparisons cannot be made. The remaining <br /> quality information taken on North Thompson Creek, in May and S eptember, <br />' is designed to monitor quality at the approximate high and low flow. <br />' The quality of North Thompson Creek above and below the mine site showed <br />little decrease in quality as it passed the site this year. In past years, <br />discharges from the No. 1 Mine and higher discharges from the No. 2 and No. <br />3 Mines affected the quality more. The quality was generally near or better <br />' than the pre-permit mean. <br />Water quality on Middle Thompson Creek was similar to previous monitoring <br />' results. <br />' GROUND HATER QUALITY <br />The results of ground water monitoring during the past year are given in <br />Appendix IV. Monthly monitoring on holes 3 and 4 at the mine site was <br />' discontinued due to reclamation of the mine site. These holes were cemented <br />according to the reclamation plan. The #1 hole that was destroyed in 1986 <br />was not reestablished. <br />1 <br />