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• Sage Creek Coal Company Responses to the CDRMS Round 3 Adequacy <br />Review of the Peabody Sage Creek Mine (C-2009-087) PAP <br />(4/19/2010) <br />The following responses address additional adequacy comments (Round 3 and 4) for the <br />Peabody Sage Creek Mine forwarded by CDMRS in a letters dated April 1 and April 14, <br />2010. Comments are addressed in this response document and appropriate revised text <br />sections and supporting information are attached to this response document. <br />55. Please revise the subsidence monitoring plan in the permit application to include: <br />a. Premining surveys of Boeddeker Reservoir #15 and County Road 27, <br />Response: A pre-mining survey of Boeddeker Reservoir # 15 (0.5 ac. ft. stockpond) was <br />conducted to establish the surface elevation of the embankment and the invert of the spillway <br />at the centerline of the embankment. Three rebar (2%2 feet long) were set to allow future <br />(mining/postmining) documentation. The location of the pond and the elevation points are <br />shown on attached Map 2.05.6-M1, Subsidence Monitoring. <br />Twelve premining survey monuments are located on the edge of Routt County Road 27. <br />Three monuments span each set of entries passing beneath the road. The location of County <br />• Road 27 and the survey monuments are shown on Map 2.05.6-M 1, Subsidence Monitoring. <br />b. A premining survey of the thalweg of Grassy Creek, and provision for a postmining <br />survey of the creek in the event mining is not subsequently proposed beyond the <br />current plan, <br />Response: A preliminary premining profile of Grassy Creek was developed using the most <br />current aerial topography available to PSCM. This profile will be field verified once the <br />spring runoff has subsided and the thalweg is accessible. The updated and revised profile <br />will be submitted once conditions allow physical surveying of the thalweg. The stream <br />section location and the profile are included on Map 2.05.6-M1, Subsidence Monitoring. <br />c. Semi-annual reporting of subsidence monitoring results, as required by Rule <br />2.05.6(6)(c)(i)(E), and <br />Response: The text beginning on page 2.05-104 has been revised to commit to semi-annual <br />reporting as required by Rule 2.05.6(6)(c)(i)(E) <br /> <br />PSCM Adequacy Response 1 4/19/10