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<br />/nnoducnon <br />' On Januazy 30, 1986, the Colorado Division of Minerals and Geology (CDMG) approved a <br />Technical Revision to reduce the hydrologic monitoring program at the site. Stations associated <br />with the Revision Area No. 2 in Deep Creek (DC-1, W-17 and W-18) were not required to be <br />' monitored by the current program; the water quality parameters of arsenic, cadmium, lead, <br />mercury, molybdenum and selenium were eliminated from all stations except well W-16 located <br />in the reclaimed area of the east pit; water quality sampling of the Stollsteimer Creek alluvium <br />' was added to station A-1 and eliminated from station W-1; and frequency of sampling, depth-to- <br />water measurements, and stream discharge measurements were not changed by this revision. In <br />' June 1988, the CDMG approved a technical revision to conduct this monitoring program on a <br />quarterly basis and in May 1990, a technical revision was approved which eliminated all <br />groundwater monitoring at the site and all monitoring wells were reclaimed. In January 1992, the <br />CDMG approved a reduction in surface water sampling to quarterly flow measurements and <br />' semiannual water quality at three surface stations. In early 1993, a decision was made to resume <br />alluvial aquifer monitoring and in late summer, wells A-1, W-1 and W-5 were reinstalled for the <br />' purposes of this monitoring. Groundwater in bedrock aquifers were not resumed because the <br />analysis of the probable hydrologic consequences of mining impacts indicated that no further <br />potential impacts would occur. <br />' The following sections of this report describe the methods and results of the hydrologic monitoring <br />program conducted at the Chimney Rock Mine site during 1995. Also contained in this report is <br />' a compazison of the data collected over the 1985 through 1995 period and recommendations for <br />future monitoring. <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />' .~~~~ <br />1995.053/3/OI-3496(12:SBpm) 3 <br />~. <br />