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Musick, Jason <br />From: Kaldenbach, Tom <br />Sent: Friday, October 22, 2010 12:04 PM <br />To: Musick, Jason <br />Cc: Hernandez, Daniel <br />Subject: Peabody Sage Creek Mine (Permit C-2009-087), MR-1,,DRMS Hydrology Review <br />Jason, <br />The information provided in the MR-1 submittal supports a decision to approve the MR. I have no adequacy comments <br />for the operator. <br />The location of COV11 is appropriate for providing baseline monitoring in the downdip, northwestern part of the permit <br />area. Monitoring at the COV11 location, in conjunction with monitoring of existing wells located to the east, will enable <br />determination of the potentiometric surface in the Wadge Overburden. The proposal to monitor only the Wadge <br />Overburden in this area, and not monitor the Wadge Coal and Wadge Underburden, is appropriate based on Robson <br />and Stewart's (USGS Water-Resources Investigation Report 90-4020) that suggests the Overburden, Coal, and <br />Underburden function as a single hydrostratigraphic unit. The proposed sampling parameters and frequencies for well <br />COV11 are the same as those for other baseline monitoring and therefore are sufficient for providing baseline <br />information. <br />Tom Kaldenbach <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Phone (303) 866-3567, ext. 8128