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Peabody Sage Creek Mine <br />SL-1 Phase 11 Bond Release Request <br />• References : Rohlf, F.J. and R.R. Sokal. 1969. Statistical Tables. W.H. Freeman and <br />Company, San Francisco. <br />• Water Quality - Total Suspended Solids (TSS)Monitoring Results <br />March 2011 <br />The Colorado Discharge Permit System (CDPS) permit has a TSS limit of 35 mg/l (monthly <br />average) and a 70 mg/1 daily limit that can not be exceeded. Water quality statistics have <br />been run for the two (2) ponds that discharge off-site. The statistics were compiled for the <br />previous five (5) year period and show the following results: <br />Pond 002 - 11.1 mg/1(average), 22.0 mg/1 maximum <br />Pond 004 - 8.1 mg/1(average), 22.0 maximum <br />PECOCO Pond - 7.6 mg/I (average), 12 mg/I maximum <br />In addition the background levels for the receiving streams upstream of the confluences are <br />significantly higher than the discharges from the Phase II request area. <br />• The monitoring results show that the TSS levels do not exceed the criteria limits set by the <br />State of Colorado. Supporting data are contained in Attachment F, Water Quality <br />Monitoring Results. <br />• Permanent Impoundment Documentation <br />The existing sedimentation ponds were approved as permanent impoundments (formerly part <br />of Seneca II) in Seneca II Technical Revision 37 (TR-37) in September 2006. The <br />documentation regarding the permanent impoundments is contained in the Seneca 11 Permit <br />Document at the locations indicated below: <br />- Appendix 7-6a, Sediment Pond 002 (Permanent Wadge Impoundment) <br />- Appendix 7-6c.2, Sediment Pond 004 Permanent Impoundment Demonstration <br />- Appendix 7-6g, Permanent Impoundment PECOCO <br />• <br />13