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WHIRLWIND MINE, PERMIT NO. M-2007-044 <br />FOURTH QUARTER 2010 HYDROLOGICAL REPORT <br />4. DP Spring <br /> <br /> <br />Sample Date <br />3/10/2008 <br />6/19/2008 <br />Sampled <br />(Y/N) <br />No <br />No <br />Inflow Rate <br />(gpm) <br />6 to 7 <br />7.2 <br />Field pH <br />(s.u.) <br />NM <br />7.42 <br />Temperature <br />(deg. C) <br />NM <br />11.0 Dissolved <br />Oxygen <br />(mg/L) <br />NM <br />7.22 Specific <br />Conductance <br />(US/cm) <br />NM <br />524 Oxygen- <br />Reduction <br />Potential (mV) <br />NM <br />126 <br /> <br />Comments <br />Sunny, Ave. of 2 feet snowpack <br />Sunny, Dry <br />9/8/2008 No 5.2 8.00 11.9 9.49 544 166 Sunny, Dry <br />12/15/2008 No 8.2 7.96 4.8 9.42 532 97 Snowing, 4" snowpack <br />2/10/2009 No 8.5 5.22 4.7 9.30 562 126 Sunny, Cold, 34" snowpack <br />4/20/2009 No 8.3 7.64 6.6 9.16 546 190 Sunny, Dry <br />8/11/2009 No 5.9 7.68 12.0 8.25 532 190 Sunny, Hot, Dry <br />12/1/2009 No 7.9 8.11 4.8 10.54 548 115 Cold, clear skies <br />2/2/2010 No 7.9 6.73 4.7 10.71 526 177 Cold, clear skies, 3 ft of snow <br />6/2/2010 No 8.3 7.53 8.8 11.62 554 200 Sunny, Dry <br />7/28/2010 No 6.8 7.68 12.6 7.57 535 114 Sunny, Dry <br />11/4/2010 No 7.0 7.94 7.1 8.66 535 190 Sunny, Dry <br /> Make-up for missed 1Q11 monitoring, <br />4/18/2011 No 8.1 7.59 6.6 9.23 533 NM* Sunny, warm, clear skies <br />* - ORP Probe broke during 4/18/11 Monitoring Event.