2016-03-02_REPORT - C1981014 - Laserfiche WebLink

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1313 Sherman Street, Room 215 Denver, CO 80203 Interoffice Memorandum March 3, 2016 From: Leigh Simmons To: Rob Zuber Subject: Southfield Mine (Permit No. C-1981-014) 2014 AHR review You requested that I review the 2014 Annual Hydrology Report for the Southfield Mine: Compliance with the Surface Water Monitoring Plan The five monitoring sites on Newlin, Magpie, and Second Alkali Creeks were monitored twice in 2014 (on May 21 and December 11), as required. No flow was recorded at any of the sites on either occasion, and no samples were taken. In addition to the required monitoring, supplemental monitoring was reported. The observations are consistent with the ephemeral nature of the three streams in question, with flow observed flows of short duration (<24 hours), and only in immediate response to large precipitation events. Ponds 4 and 5 treat storm water at the main mine site, and have CDPS 002 and 004 discharge points associated with them respectively. Neither pond discharged during the reporting year. Water accumulated to just below the discharge level by the end of August, 2014, following summer storms, but diminished again subsequently. Ponds L-1 and L-2 treat storm water at the loadout, and have CDPS 001 and 002 discharge points associated with them respectively. Neither pond discharged during the reporting year. Reclamation of both of these ponds began in October and was completed in late November, 2014. Compliance with the Groundwater Monitoring Plan The four groundwater monitoring points were monitored twice in 2014 (on May 22 and December 17), as required. MW-16 and MW-NW were reported as dry on both occasions; the depth to water was recorded at MW-23 and MW-65, and water quality samples were taken and analyzed. 1313 Sherman Street, Room 215, Denver, CO 80203P 303.866.3567 F 303.832.8106 http://mining.state.co.us John W. Hickenlooper, Governor | Mike King, Executive Director | Virginia Brannon, Director