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Marr Mine - 2007 Annual Hydrology Report May 2007 <br />1.0 I' OPERATIONAL CONDITIONS <br />Active mining and coal production operations at the Marr Mine ceased in January 1993. During <br />the active life of the mine, mining' operations occurred in three areas; the Marr Pit, 720 Pit, and !Pit <br />1. Mining was completed and most of the associated disturbance in the Marr Pit area was <br />reclaimed during the period from 1979 through 1983. The 720 Pit and Pit 1 areas were backfilled <br />and reclaimed during the period from 1993 through 1996. Reclamation of the mine surface <br />facilities that will not be retained as permanent facilities to support the post-mining land use and <br />the associated coal Loadout facility was completed in 1999. A spoil monitoring well (SP-01) was <br />installed at the north end of the 720 Pit area in 2001. The only ongoing activities for the site are <br />site maintenance, environmental monitoring, and reclamation permit compliance activities. Kerr <br />Coal Company (Kerr) in cooperation with the Colorado Department of Natural Resources Division <br />of Reclamation, Mining and Safety (DRMS), the United Stated Department of the Interior Bureau <br />of Land Management (BLM) and the Office of Surface Mining, Reclamation and Enforcement <br />(OSMRE) completed a program during 2002 to identify, plug, seal, and reclaim a number of old <br />exploration boreholes and shallow alluvial monitoring wells in the Kerr North Area, north of the <br />County Road. In 2006, Pond C (CDPS #303) and Pond G and their associated soil stockpiles and <br />ditches were reclaimed. Pond F was recommended for permanent status in 2006 and the decision <br />was approved in 2007. In 2007 (TR-23) Kerr recommended that all surface, groundwater and <br />vegetation monitoring at the mine be revised (terminated) because all the requirements of the <br />permit had been met. TR-23 was also approved and the bond release request was submitted. At <br />this point in time, this will be the last Annual Hydrology Report for the mine area. A report will be <br />submitted for the Tipple area until final bond release is requested. <br />6371/2007/2007 hydrology rpt Page 1