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• PREFACE <br />The Pond O16A and Pond 016 Two Pond system has developed and evolved in phases based on the <br />revisions in the mining configurations. The original plan anticipated that only the Wadge seam <br />would be mined and Pond 016 was constructed in the fall of 2000 to control runoff and sediment <br />from the mining disturbance. <br />In 2003 the mine plan was expanded to include nvuitg additional azea that included the Sage <br />Creek/Wolf Creek seams. In response to this new mine plan SCC designed and constructed a <br />second pond (016A) to operate in series with Pond 016 to effectively treat runoff from the increased <br />disturbance area. This pond was constructed in the summer of 2003. <br />In 2004, it was decided to cease mining at II-W at the end of 2005 or eazly 2006 due to the <br />increasingly difficult mining conditions being encountered. This derision resulted in a decrease in the <br />disturbance controlled by Pond 016A and Pond 016. During this mine plan revision, it was <br />determined that the emergenry spillway at Pond 016 was not at the elevation previously certified. <br />Therefore based on the reduced disturbance azea, SCC reran the SEDCAD demonstrations and <br />corrected the emergency spillway configuration to meet the current requirements and has included a <br />certification. <br />This attachment has been organized to include certified as-built reports for aVl phases of the <br />construction of this 2-pond system. Some of the reports will have reference to non-existent <br />attachments, but all the relevant required information is included in the appropriate appendices <br />within this Attachment. <br />• • Appendix 1, As-Built Report Sedimentation Stmcture Pond 016 <br />Pond 016 Spillway Certification (current condition) <br />- As-Built Report Pond 016 (construction) <br />- SEDCAD Demonstrations (current conditions) <br />- Stability Analysis of As-Built Conditions (Pond 016 construction) <br />Appendix 2, As-Built Report Sedimentation Structure Pond 016A <br />- As-Built Report Pond 016A (construction) <br />- SEDCAD Demonstrations (current conditions) <br />- Stability Analysis of As-Built Conditions (Pond O] 6A construction) <br />CJ <br />TR-53 Revised 6/05 <br />