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Peabldq <br />Peabody Energy 36600 Routt County Rd. 27 <br />Hayden, CO. 81639 <br />Sage Creek Coal Company, LLC (970) 276-7001 <br />April 15, 2011 0 <br />Mr. Jason Musick 0 <br />Colorado Division of Reclamation Mining & Safety (DRMS) L tiQ?? a 1313 Sherman Street, Rm 215 CZ <br />Denver CO 80203 QQ o? lox <br />Re: Peabody Sage Creek Mine (Permit No. C-2009-087) <br />Technical Revision (TR 02-11) Submittal - Hydrology Monitoring Plan Reductions <br />Mr. Musick, <br />The Peabody Sage Creek Mine (PSCM) is submitting this technical revision to make reductions, additions <br />and corrections to the hydrology monitoring plan. Details concerning these changes are found below. <br />New Groundwater and Surface Water Analytical Parameter Short Lists, Tables 2.04.7-T10.1 and T12.1 <br />(respectively), have been added. These are the same lists as the `revised long lists' that were approved for <br />Peabody Energy's Seneca II Mine (PR-2 approved 12/10), Seneca II-W Mine (TR-69 approved 5110) and <br />Yoast Mine (TR-47 approved 5110). Basically, these revised lists removed parameters without Colorado <br />Department of Public Health and Environment (CDPHE) standards. In addition arsenic, boron, cadmium, <br />chloride, chromium, copper, lead, nickel, silver and zinc were removed from the Surface Water Long <br />Parameter List, since no (or very few) exceedances of those parameters occurred from 2005 to 2009 at <br />stream and NPDES sites. Likewise, aluminum, arsenic, boron, cadmium, chloride, chromium, copper, <br />lead, mercury nickel and zinc were removed from the Ground Water Long Parameter List, since no (or <br />very few) exceedances of those parameters occurred from 2005 to 2009 at the monitor wells. Finally, the <br />`Potentially Dissolved' analytical technique (on both Surface Water Long Parameter Lists) will be <br />changed to `Dissolved' as recommended by the CDPHE. <br />The new Groundwater Analytical Parameter Short List will be used for the old Seneca II wells (wells <br />beginning with a `S' on Table 2.04.7-T9), with the exception of the `point of compliance' well SGAL70, <br />which will continue to use the long list. The deep bedrock wells associated with the PSCM underground <br />mining area (wells beginning with a `C' on Table 2.04.7-T9) will also continue to use the long list. The <br />new Surface Water Analytical Parameter Short List will be used on all surface water and spring sites with <br />the following two exceptions. The furthest downstream site on Grassy Creek, YSG5, which is the `point <br />of evaluation' for surface water impacts under SMCRA, will continue to the long list. Also, Spoil Spring <br />SSSPG6 will continue to use the long list, as it occasionally exceeds aquatic life standards for cadmium, <br />nickel and zinc. <br /> <br />