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Annual Update <br />Sunnyside Mine Bulkheads <br />Page 2 <br />Study Update: <br />Attached in Appendix B is the data collected through March 2002 for the seep, spring, <br />and flowing adit inventory and monitoring required by TR-14. <br />During the report year no new monitoring sites were added and no sites were deleted. <br />Sunnyside visited all identified sites twice during the report year, collected field data, <br />and sampled for lab analysis more than the 20 percent of the sites the monitoring <br />program (attached in Appendix B) requires. Data summary sheets are included in <br />Appendix B. <br />Data Analysis: <br />Seep, spring and flowing adit samples were taken in early summer, when the sites <br />became accessible and snow-melt would not bias the samples, and fall before snowfall <br />was expected to shut off site access. The sampling efforts were spread over <br />approximately a month for each round. Early July was an approximate mid-point of <br />the summer sampling round and late-September for the fall sampling round. Mine pool <br />monitoring ended with final closure of the American Tunnel #1 Bulkhead valves on <br />May 14, 2001. The mine pool elevation was 11,661 feet MSL which was considered <br />physical equilibrium. This level is expected to fluctuate within a zone dependent on <br />seasonal inflows. <br />Included in Appendix B is a table of the monitoring sites sorted by elevation and <br />monitoring data for these sites ordered by drainage. Since the mine pool could not <br />have affected these sites through 1996, a data analysis (i.e. sample count, average, <br />standard deviation, maximum value, and minimum value) is provided for pre-1997 <br />data. <br />Following this section is the data collected from 1997-2002 for comparison. The <br />significant variances SGC observed in flow quantity from the pre-1997 data remained <br />as reported for 2001 (Mogul Level #1 adit and possibly Gold King adit). Because of <br />the drought conditions, other flows generally appear to be less than normal. <br />Although the actual cause of the variances in the Mogul and Gold King flows has not <br />been determined, SGC has addressed these variances to the satisfaction of CDPHE in <br />the Amendment No.4 to the Consent Decree. SGC is providing funds for the owners to <br />address the flows at these sites. <br />