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Peabod <br />VIII ENERGY <br />Peabody Sage Creek Mining, LLC <br />Colorado Department of Public Health and Environment <br />Water Quality Control Division <br />Permits and Enforcement Section <br />4300 Cherry Creek Drive South <br />Denver, CO 80246 -1530 <br />Dear Kelly Morgan: <br />C____7_,GCc-1-01e) 7 <br />36600 Routt County Rd. 27 <br />PO Box 250 <br />Hayden, CO. 81639 <br />(970) 276-7001 <br />October 10, 2012 <br />RECE <br />c Si <br />D!v;slon or : .,ciamaf+ ^n, <br />PJ:,ning a o `j <br />RE: Revised Quarterly DMRs for CPDS Permit No. CO- 0048275, Peabody Sage <br />Creek Mine <br />Pursuant to Notice of Violation Number I0- 120912 -1 ( "NOV /CDO "), Item 30, attached <br />please find revised DMRs for Outfalls 002 and 004. As explained below, these Revised <br />DMRs contain only revised potentially dissolved selenium values. All other parameters <br />on the previously submitted DMRs remain as previously filed. <br />For the second quarter of 2011, potentially dissolved values (obtained by ICP -MS, EPA <br />Method M200.8, MDL range 0.1 to 0.2 ug/l, PQL range 0.3 to 0.5 ug /1) for Outfall 002 <br />were 6.7 ug /1 on April 20, 14 ug /1 on May 5 and 10.7 ug /1 on June 16. For Outfall 004, <br />potentially dissolved values (obtained by ICP -MS, EPA Method M200.8) were 3 ug /1 on <br />April 5, 17.9 ug /1 on May 16 and 10.8 ug /1 on June 13. Revised DMRs for these two <br />outfalls are attached. <br />For the third and fourth quarters of 2011 at Outfalls 002 and 004, all potentially dissolved <br />selenium values were obtained by AA- Hydride (EPA Method SM 3114 B, with a MDL <br />of 1 ug /1 and PQL of 5 ug /1) only. Therefore, those DMRs need not be revised. <br />For the first quarter of 2012 at Outfalls 002 and 004, potential dissolved AA Hydride <br />selenium values were me !l all three months while the ID_MS values ----- -�� ��� . ... � ... ... (luring ..aaa �aa months, C <br />while the 1 -1Y14J YUlUeJ VV L+1V <br />measured only in the month of March. For Outfall 002, the highest AA Hydride value in <br />the quarter was 4.0 ug /1 on January 9, while the highest ICP -MS value was 3.3 ug /1 on <br />March 6. As the NOV /CDO requested that we report the ICP -MS values, the attached <br />Revised DMRs indicate the 3.3 ug /1 value as the highest 30 day average and daily <br />maximum. For Outfall 004, the highest AA Hydride value in the quarter was 1.2 ug /1 on <br />February 23, while the highest ICP -MS value was 6.5 ug /1 on March 6. The total <br />recoverable selenium value was 2 ug /1 on the March sample; this value was obtained by <br />ICP -MS, EPA Method M200.8, with a MDL of 0.2 ug /1 and PQL of 0.5 ug /1. One would <br />expect the total recoverable method to result in the same, or higher, value than the <br />potentially dissolved method (the former involves a hot acid digestion, while the later <br />