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M-2008-078—GP Aggregates,LLC—West Farm Pit—Technical Revision Request No.3 <br /> August 15,2014 <br /> -2- <br /> is the documentation required to provide the Division assurance that the constructed slurry <br /> wall(s) will meet the State Engineer's performance standard for lined gravel pit leakage <br /> rates, as detailed in the "State Engineer Guidelines for Lining Criteria for Gravel Pits", <br /> including: <br /> a. The geotechnical investigation and report for the site; <br /> b. The seepage and rapid drawdown/slope stability analysis for the slurry wall(s); <br /> c. Slurry wall and reservoir construction drawings; <br /> d. Technical specifications for the construction of the slurry wall. These specifications <br /> will be used for all sections of slurry wall. The specifications include the requirements <br /> for the materials, equipment, and construction methodology to be used in the <br /> construction of the slurry wall, and Quality Control/Quality Assurance testing and <br /> reporting required to ensure the quality/performance of the wall and document the <br /> construction process. <br /> e. GP commits to providing to the Division as-built drawings of the slurry wall(s) and <br /> final construction reports for each section of slurry wall at the completion of the <br /> construction and leak testing of each section of wall. <br /> The inclusion of this information enables GP to be eligible for the regulated construction <br /> financial warranty option (20% bonding option). <br /> 2. A revised Exhibit L — Reclamation Costs and supporting calculations are attached which <br /> summarize the revision to the financial warranty requirements, including a reduction to 20% <br /> of the installation costs for the slurry wall component of the bond. <br /> GP appreciates your consideration of this revision request and looks forward to your response. <br /> Please feel free to contact me with any questions or comments. <br /> Sincerely, <br /> Todd Yee <br /> J&T Consulting, Inc. <br /> Attachments: <br /> Revised Exhibit C-Pre-Mining/Mining Plan Map <br /> Revised Exhibit L-Reclamation Costs and Reclamation Costs Summary Table <br /> Revised Financial Warranty Requirement Calculations <br /> "Subsurface and Laboratory Data-West Farm Slurry Wall"by J.A.Cesare and Associates dated August 10, 2011 <br /> "West Farm Pit Seepage and Rapid Drawdown/Slope Stability Analyses"by Cesare, Inc.dated March 21, 2013 <br /> 02261 Soil-Bentonite Slurry Walls Technical Specification <br /> "West Farm Pit Slurry Wall and Construction Plans"by J&T Consulting dated May,2013 <br /> $216 Check for Technical Revision review fee <br /> Cc: GP Aggregates, LLC. <br /> File <br /> it 305 Denver Avenue, Suite D•Fort Lupton,CO 80621 •Ph:303-857-6222• Fax:303-857-6224 <br />