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41 GCC <br />Rio Grande <br />Pueblo Plant <br />Via FedEx 793867744625 <br />"Mr. Tim Cazier <br />Division of Reclamation, Mining, and Safety <br />1313 Sherman Street <br />Room 215 <br />Denver, CO 80203 <br />RECEIVED <br />AUG 292012 <br />�DDivision of Reclamation, <br />; Mining & Safety <br />August 3, 2012 <br />Re: GCC Rio Grande, Inc. - DRMS Permit No. M- 2002 -004, Revision No. AM -1 <br />,, Second uarter_2.012 Groundwater Moni oring Report <br />Dear Mr. Cazier: <br />Enclosed are two copies of the Second Quarter 2012 Groundwater Monitoring Report (Report), as <br />required by your letter to GCC dated February 24, 2012. Pursuant to your letter, GCC is only required to <br />monitor for TDS on a quarterly basis. Nevertheless, Contour Consulting Engineers had all samples <br />analyzed for all four parameters for which the Division has established Numeric Protection Levels. <br />The groundwater sampling was conducted on June 21, 2012, and the report was transmitted to GCC on <br />July 29, 2012. As mentioned in previous letters, it takes two to three weeks to obtain the analytical <br />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 April and October 2011 and March and June 2012. <br />*Exceeds DRMS NPL <br />GCC Rio Grande, Inc. • Pueblo Plant <br />3372 Lime Road a Pueblo, CO 81004• <br />(719) 647 -6800 a Fax (719) 647 -6899 <br />MW -002 <br />MW -003 <br />DRMS <br />NPL <br />April <br />October <br />March <br />June <br />April <br />October <br />March <br />June <br />2011 <br />2011 <br />2012 <br />2012 <br />2011 <br />2011 <br />2012 <br />2012 <br />Sulfate, <br />1950 <br />862 <br />930 <br />1200 <br />713 <br />1160 <br />1610 <br />1860 <br />2490* <br />m /l <br />TDS, mgll <br />2630 <br />1590 <br />1760 <br />2150 <br />1480 <br />2190 <br />3060* <br />3650* <br />4700* <br />R -226, PiCll <br />23.5 <br />3.4 <br />1.4 <br />2.6 <br />2 <br />2.3 <br />1.3 <br />3.5 <br />1 <br />R -228, PiCll <br />12.3 <br />3.9 <br />2.5 <br />2.1 <br />1.1 <br />0.3 <br />0.8 <br />1 <br />0.2 <br />*Exceeds DRMS NPL <br />GCC Rio Grande, Inc. • Pueblo Plant <br />3372 Lime Road a Pueblo, CO 81004• <br />(719) 647 -6800 a Fax (719) 647 -6899 <br />