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41 I r <br />GCC <br />Rio Grande <br />Pueblo Plant <br />''Mr. Tim Cazier <br />Division of Reclamation, Mining, and Safety <br />1313 Sherman Street <br />Room 215 <br />Denver, CO 80203 <br />ReGf Fl, D <br />APP, 2 5 2012 <br />11 __Division of Reciamatio <br />17J Mining a Safet n y <br />April 24, 2012 <br />Re: GCC Rio Grande, Inc. - DRMS Permit No. M- 2002 -004, Revision No. AM -1 <br />-0irst Quarter 2012 Groundwater Monitoring Report <br />Dear Mr. Cazier: <br />Enclosed are two copies of the First Quarter 2012 Groundwater Monitoring Report (Report), as required <br />by your letter to GCC dated February 24, 2012. All samples were analyzed for the four parameters for <br />which the Division has established Numeric Protection Levels so that this sampling event could be used <br />to satisfy the bi- annual ground water monitoring requirement. <br />The groundwater sampling was conducted on March 20, 2012, and the report was transmitted to GCC on <br />April 16, 2012. It takes two to three weeks to obtaining the analytical results for Ra -226 and Ra -228. <br />The following monitoring wells were sampled: <br />• MW -002 <br />• MW -003 <br />• MW -004 <br />Samples were not collected from deep well MW -001A and shallow well MW -005. Both of these wells <br />were dry and have been dry since 2008. <br />The table below presents the numeric protection levels (NPLs) established in the DRMS's December 8, <br />2010 letter and the concentrations measured in the groundwater samples in April 2011, October 2011 <br />and March 2012. <br />*Exceeds DRMS NPL. <br />* *Suspected outlier. <br />DRMS <br />NPL <br />MW -002 <br />MW -003 <br />MW -004 <br />April <br />2011 <br />Oct. <br />2011 <br />March <br />2012 <br />April <br />2011 <br />Oct. <br />2011 <br />March <br />2012 <br />April <br />2011 <br />1 <br />Oct. <br />2011 <br />March <br />2012 <br />Sulfate, mg /I <br />1950 <br />862 <br />930 <br />1200 <br />1160 <br />1610 <br />1860 <br />990 <br />1410 <br />1640 <br />TDS, mg /I <br />2630 <br />1590 <br />1760 <br />2150 <br />2190 <br />3060* <br />3650' <br />1850 <br />2640" <br />3040* <br />R -226, PiC /I <br />23.5 <br />3.4 <br />1.4 <br />2.6 <br />2.3 <br />1.3 <br />3.5 <br />2.5 <br />3.8 <br />3.0 <br />R -228, PiC /I <br />12.3 <br />3.9 <br />2.5 <br />2.1 <br />0.3 <br />0.8 <br />1.0 <br />3.6 <br />1.2 <br />13.0 ** <br />*Exceeds DRMS NPL. <br />* *Suspected outlier. <br />