2015-08-28_REVISION - C1981014 - Laserfiche WebLink

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TR -43 Adeauacv Responses Page 4 August 25 2015 (Hydrology Monitoring Plan) stating that applicable hydrologic monitoring was terminated by approval of TR43. The revised preface, and revised PAP pages 2.04.7-7a, 2.05.6-51, 2.05.6-51a, 4.05-25, 4.05- 26, and 4.05-27 are attached hereto for your review. 1) d) i) DRMS concern Please provide a detailed analysis of the impact of the Southfield Mine on groundwater quality, allowing the identification of trends in the data (perhaps a selection of individual water quality parameters could be plotted against time, for example: TDS, [Fe], [Mn],[Se]... ) EFCI response EFCI has updated groundwater quality data, through the 2nd quarter of 2015, on the graphs attached hereto in Appendix A. These data indicate that MW 16 held water for the first time since going dry in 2006, and a sample was taken in June 2015. The region received unusually high precipitation during May and June 2015, which evidently temporarily recharged the zone monitored by the well. Samples were also obtained from MW23 and MW65, while MWNW was dry. Based on the new data and review of the "2015 Weaver Analysis" (previously submitted) of the impact of the Southfield Mine to the quality of groundwater, the aforementioned analysis is accurate. 1) d) ii) DRMS concern Please include data collected from each groundwater monitoring point in the analysis, including MWNW (which may be dry), in accordance with the approved water monitoring plan described in Exhibit 25, and make a comparison to predictions made in the PAP. Items 1) d) i) and ii) have not yet been addressed to the Division's satisfaction. The 2015 Weaver Analysis is appropriate in its approach, but will need to be resubmitted with the additional data available fofiowing the abatement of NOV CV -2013-002. EFCI response Same as response to Item 1) d) i), above. 2) a) DRMS concern Please continue to follow the approved water monitoring program, and to attempt to monitor the creeks during times of high flow. The response is noted. Please continue to follow the approved water monitoring program. EFCI response EFCI continues to follow the approved hydrology monitoring program as evidenced by the data collected and presented with this submittal. EFCI diligently conducted numerous field trips to obtain samples from creeks during the spring of 2015, as all flowed due to the unusually high amount of rainfall.