Laserfiche WebLink
GCC <br />Rio Grande <br />Pueblo Plant <br />January 3, 2011 <br />Mr. Berhan Keffelew <br />Hydrogeologist <br />Division of Reclamation, Mining, and Safety <br />1313 Sherman Street <br />Room 215 <br />Denver, CO 80203 <br />Re: GCC Rio Grande, Inc. - DRMS Permit No. M-2002-004 <br />Annual Groundwater Monitoring Report 2010 <br />Dear Mr. Keffelew, <br />This report summarizes the results of groundwater monitoring at the referenced facility during Calendar <br />Year 2010. Pursuant to your letter to GCC dated December 8, 2008, semi-annual groundwater <br />monitoring is required with results to be submitted annually. <br />Groundwater sampling was conducted on April 30, 2010 and October 26, 2010. We received the report <br />from the October sampling event on December 11, 2010. Two copies of this report are enclosed with this <br />letter. Copies of the report of the April sampling event were submitted to you on July 1, 2010. <br />The following monitoring wells were sampled in April and October: <br />• MW-002 <br />• MW-003 <br />• MW-004 <br />Samples were not collected from deep well MW-001A and shallow well MW-005 in 2010. Both of these <br />wells were determined to be dry in 2008. <br />The table below presents the numeric protection levels (NPLs) established by DRMS in your December 8, <br />2010 letter and the concentrations measured in the groundwater samples in April and October. None of <br />the sample concentrations exceeded the DRMS NPL. <br /> MW-002 MW-003 MW-004 <br /> DRMS <br />NPL <br />April 30, <br />2010 <br />October <br />26, 2010 <br />April 3300, <br />2010 <br />October <br />26, 2010 <br />April <br />2010 October <br /> <br />26, 2010 <br />TDS, m /l 2630 1630 1930 960 2590 2440 2180 <br />Sulfate, m /l 1950 810 950 407 1220 1250 1050 <br />R-226, PiC/I 23.5 4.1 3.0 6.8 1.5 1.9 4.9 <br />R-228, PiC/I 12.3 1.9 2.0 1.8 1.9 1.2 5.0 <br />GCC Rio Grande, Inc. • Pueblo Plant <br />3372 Lime Road •Pueblo, Colorado 81004 <br />(719) 647-6800 • Fax (719) 647-6899