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4 <br /> GC C <br /> Rio Grande <br /> Pueblo Plant <br /> April 22, 2016 <br /> Mr.Tyler O'Donnell <br /> Environmental Protection Specialist <br /> Division of Reclamation and Mining Safety <br /> 1313 Sherman Street, Room 215 i <br /> Denver, CO 80203 <br /> Re: Pueblo Cement Plant and Limestone Quarry, DMRS Permit N . M-20 - <br /> 0 02 004 I <br /> Groundwater Monitoring Evaluation <br /> f <br /> In follow up to the recent technical evaluation (Close Consulting Group LLC, March 17, 2016) and our <br /> meeting with you on March 28, 2016, GCC Rio Grande, Inc. has developed a proposed path forward to <br /> resolve questions and concerns about groundwater monitoring at the Pueblo facility. The technical G <br /> evaluation, performed by a consulting groundwater hydrologist, provides an increased understanding of the <br /> local stratigraphy, groundwater conditions and potential pathways and directions for potential contaminants <br /> to occur and migrate in the subsurface. Based on the available data, the evaluation did not reveal any <br /> saturation in strata that would be in hydraulic communication with the plant or quarry. <br /> None of the potential sources of groundwater identified in the above referenced report appear to be <br /> significant enough to indicate a need for groundwater monitoring. Similarly, the available data does not <br /> indicate that there are any chemical constituents of concern that would be significantly increased due to the <br /> plant or quarry operations. t <br /> Although the available data and analyses provide a good technical justification for no additional <br /> monitoring,GCC Rio Grande appreciates that there is a certain level of uncertainty and is willing to perform a <br /> program to help confirm the results of the latest technical evaluations. <br /> GCC proposes to install an additional boring/well as the next logical step to satisfy this uncertainty. This <br /> boring would be performed along what we consider to be the most likely pathway for saturation to develop <br /> and any potential contaminants to migrate. Figure 1 shows the proposed drilling location, located between <br /> the second mine panel and production well DW-1. The primary target screen interval would include the <br /> Codell, but extend up approximately 5 feet above the Fort Hayes/Codell contact. Monitoring of this well <br /> would occur semi-annually during the first year of the program and continue annually if no water is found. <br /> If this drilling program reveals saturation and groundwater production in these intervals, GCC would discuss <br /> with DRMS and possibly move forward to install a similar well downgradient of the plant site. If no saturation <br /> and groundwater pathway is found in either the Fort Hayes or Codell at this location, this will further <br /> substantiate the findings of the recent evaluation. <br /> If you ave any questions or comments, please contact me or Edwin Olivares at(719)647-6861. <br /> Sincere <br /> Saul Alvidrez Plant Manager April 22,2016 <br /> Name of Responsible Official Title Date Signed <br /> GCC Rio Grande,Inc.. Pueblo Plant <br /> 3372 Lime Road s Pueblo,CO 81004 <br /> (719)647-6800•Fax(719) 647-6899 <br />