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October of 2011. Appropriate bonding for this winterization will be posted with DRMS prior <br />to construction. <br />The stated objective of TR -15 was "expansion of alluvial groundwater extraction systems." <br />The approved application called for "flexibility with respect to potential future expansion of <br />the alluvial groundwater capture capacity of the system." Consistent with the intent and <br />flexibility described in the application for TR -15, Cotter has utilized intensive monitoring <br />efforts and data evaluations to aggressively develop and implement measures to expand <br />capture /treatment of alluvial groundwater in order to improve water quality in Ralston Creek <br />as soon as possible. Treatment system and stream monitoring data indicate that these efforts <br />have been effective, significantly increasing uranium capture and generally reducing levels in <br />the creek. <br />All significant changes to the permitted /affected area resulting from sump /French drain <br />installations and /or burial of pipeline /electrical infrastructure have been or will be conducted <br />under the provisions of TR -15. In addition, all sump installations have been properly <br />permitted through the State Engineer's Office with the Department of Natural Resources. <br />The requested list of groundwater extraction locations, dates and corresponding Technical <br />Revisions are as follows: <br />TR -12 <br />• Historic Sump 1: Retrofitted in late June /early July 2010. Pumping initiated on July <br />2, 2010. Burial of piping /electrical infrastructure for permanent winterization <br />performed in conjunction with installation of Sumps 5 and 8 under TR -15. <br />Voluntary System Expansion Using Existing Facilities <br />• Historic Sump 4: Retrofitted on August 15 -16, 2010. Pumping initiated on August <br />16, 2010. Burial of piping/electrical infrastructure for permanent winterization <br />performed in conjunction with installation of Sumps 5 and 8. <br />• Historic MW 9: Monitoring well converted to a pumping well on August 18 -19, <br />2010. Pumping initiated on August 19, 2010. Burial of piping/electrical <br />infrastructure for permanent winterization performed in conjunction with installation <br />of Sumps 5 and 8. <br />TR -15 <br />• Sump 5: Installed on November 3 -9, 2010. Pumping initiated November 11, 2010. <br />On July 19 -20, 2011, the French drain system for this sump was expanded in the <br />upgradient direction (to the northwest) by about 100 feet. Accumulated sediments <br />within the sump were removed on September 23, 2011 and a drill rig was <br />subsequently used to bore a 30 -inch diameter hole in the bottom of the sump to <br />increase the total well depth by about 4 feet, about 18 inches into underlying <br />weathered bedrock. This well modification was permitted through the State <br />Engineer's Office with the Division of Water Resources. The pump was re- installed <br />3 <br />