2011-02-28_REVISION - C1994082 (6)

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Yoast Mine SL-3 Phase 11 Bond Release Request Febmary 2011 been run for the five (5) ponds that discharge off-site. The statistics were compiled for the previous five (5) year period and show the following results: Pond 010 _ 9.0 mg/l (average) - 12 mg/l (maximum) Pond 011 _ 11.2 mg/1(average) - 28 mg/1(maximum) Pond 012 _ 10.4 mg/l (average) - 25 mg/l (maximum) Pond 013 _ 10.3 mg/l (average) - 26 mg/1(maximum) Pond 014 _ 33.4 mg/l (average) - 170* mg/l (maximum) * The "normal " NPDES limits are 35 mg/l, except during precipitation or snowmelt events, in which case there is no TSS limit. Pond 014 normally only discharges during snowmelt runoff. In addition the background levels for the receiving streams upstream of the confluences are significantly higher than the discharges from the Phase II request area. The monitoring results show that the TSS siandard/requirements do not exceed the criteria limits set by the State of Colorado. Supporting data sheets and graphs are contained in Attachment F, Water Quality Monitoring Results. • Permanent Impoundment Documentation Three of the existing sedimentation ponds at Yoast were accepted as permanent impoundments with the approval of Technical Revision 37 (TR-37) in March 2008.. The • current approved permanent impoundments are: - Pond 010 - Pond 013 - Pond 014 The documentation regarding the permanent impoundments is contained in the Permit Application Package in Attachment 20-1, Permanent Structures and Features, Appendix 20- 1.2 Permanent Pond Demonstrations • Attachment Descriptions Attachment A - contains a Notarized Statement that all reclamation work has been completed in compliance with approved permit and Rule 3.03.2(1)(e). Attachment B, Public Notification Letters - contains a copy of each letter sent to the general public and agencies. Attachment C, Public Notice and Proof of Publication - contains a copy of the Public Notice that was published in the Steamboat Pilot and verification that the notice was published 4 consecutive times. Attachment D. Topsoil Depth Sampling Summary - presents a summary of each sample collected and the depth of topsoil at that sample location. The summary represents 172 topsoil depth samples. 9