2000-06-07_REPORT - M1977378 - Laserfiche WebLink

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Annual Update Sunnyside Mine Bulkheads Page 4 Included in Appendix B is monitoring data and a graph of the mine pool pressure readings through March 2000. The mine pool surface is above the zone of predicted equilibrium and it appears that physical equilibrium was reached during the 1999 report year. Study Update: Attached in Appendix B is the data collected through March 2000 for the seep, spring, and flowing adit inventory and monitoring required by TR-14. During the report year no new monitoring sites were added and no sites were deleted. Sunnyside visited all identified sites twice during the report year, collected field data, and sampled for lab analysis more than the 20 percent of the sites the monitoring program (attached in Appendix B) requires. Data summary sheets are included in Appendix B. Data Analysis: Seep, spring and flowing adit samples were taken in early summer, when the sites became accessible and snow-melt would not bias the samples, and fall before snowfall was expected to shut off site access. The sampling efforts were spread over approximately a month for each round. Early July was an approximate mid-point of the summer sampling round and late-September for the fall sampling round. The mine pool elevation rose 56 feet between rounds. It was approximately 11,557 feet MSL in early July and 11,613 feet MSL in late-September. Included in Appendix B (B-19) is a table of the monitoring sites sorted by elevation and monitoring data for these sites ordered by drainage. Since the mine pool could not have affected these sites through 1996, a data analysis (i.e. sample count, average, standard deviation, maximum value, and minimum value) is provided for pre-1997 data. Following this analysis is data collected from 1997-1999 for comparison. SGC observed significant quantity differences from the pre-1997 data throughout the Cement Creek drainage. This could be attributable to the above normal precipitation received throughout the summer. Of particular note were the quantity and quality variances from the background data noted at the Mogul Level #1 adit (M-1). This variance was reported to DMG by a letter report dated October 13, 1999. Additional monitoring will be required to determine whether these flow variances are attributable to weather patterns, filling of the mine pool and the associated cone of depression that existed because of drainage from the Sunnyside Mine or flow through the Sunnyside Mine.