2018-12-26_REVISION - M2008078 (29)

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RE: Prowers Aggregate Operators, LLC. - West Farm Pit-Permit No. M-2008-078 112c Permit Amendment Application (Revision No. AM-01) Preliminary Adequacy Review Response 12121118 -16- agreement is being negotiated with the City of Lamar. See the attached agreement and Fedex overnight tracking information. Additional Items: 47) For the West Farm Seepage and Rapid Drawdown/Slope Stability Analyses prepared by Cesare, Inc. (dated March 21, 2013) and the Data Report, Seepage, Rapid Drawdown, and Slope Stability Analyses also prepared by Cesare, Inc. (dated February 2, 2016), please provide a site map showing locations of the sections analyzed. Response: See the attached slope stability section location map. 48) Please provide a stability analysis for the proposed slurry wall to be installed in the South Mining Area (similar to the ones submitted for the North Mining Area slurry walls), or commit to providing the analysis prior to its installation. Response: PAO commits to providing a slope stability analysis for the proposed slurry wall in the south mining area prior to its installation. Thank you for your consideration of our responses to the comments. Please feel free to contact me with any questions or if you need additional information. Sincerely, I. e- J.C. York, P. J&T Consulting, Inc. Attachments- 1. Revised Exhibit C-1 Pre-Mining/Mining Plan Map 2. Reseeded Sediment Pond Area Photos(2) 3. Special Warranty Deed 4. Conservation Easement Deeds 5. Exhibit C-2 Pre-Mining/Mining Plan Map 6. Phase 1 Slurry Wall Final Construction Drawings 7. Phase 2 Slurry Wall Final Construction Drawings 8. Soil-Bentonite Slurry Walls Specification 9. Revised Exhibit D Narrative 10. Concrete Rundown and Floating Pump Station Photos(3) 11. Revised Exhibit F Reclamation Plan Map 12. Revised Exhibit E Narrative 13. Reservoir Water Balance Accounting Spreadsheet 14. Revised West Farm Pit Stormwater Management Plan 15. West Farm Pit Substitute Water Supply Plan and Accounting Spreadsheet 16. Figure Exhibit G-1 17. Flood Insurance Study, Prowers County and Unincorporated Areas 18. Flood Insurance Rate Maps(3) 19. Excerpts from"Technical Review Guidelines for Gravel Mining &Water Storage Activities Within or Adjacent to 100-Year Floodplains"by Urban Drainage&Flood Control District 20. Exhibit L Reclamation Phasing Map 21. Revised Exhibit L Narrative and Reclamation Cost Summary Table 22. Reclamation Bond Estimate Calculations and Phase 2 Slurry Wall Construction Cost Data 23. Centurytel Agreement and Certified Mail Receipt 24. Rasmussen Certified Mail Tracking Information 25. AT&SF Structure Agreement and Certified Mail Receipt 26. Revised Exhibit S 27. Prowers County Road Department Agreement for Use and Maintenance of County Roads 28. City of Lamar Agreement and Fedex Overnight Tracking Information 29. Slope Stability Section Location Map V 1 305 Denver Avenue—Suite D•Fort Lupton CO 80621 •Ph: 303-857-6222•Fax: 303-857-6224