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6.4.5(2)(a) <br />Revised 1/27/2011 <br />DBMS Quest #1.0 <br />(No waste asphalt or cement will be place in ANY PORTION OF THE EXCAVATED AREA OR ANY OTHER <br />• AREA OF THE PERMIT AREA UNLESS APPROVED BY THE DRMS THROUGH A TECHNICAL REVISION.) <br />Slurry walls are an integral part of the proposed reclamation plan. Following is a conceptual <br />plan for slurry wall construction and a typical Quality Assurance and Quality Control (QA/QC) <br />program. If not available at the time of submittal of this Application, a set of detailed plans and <br />a detailed QA/QC program will be provided as a Technical Revision to the approved permit <br />application prior to construction. A preliminary slope and slurry wall design is provided in <br />Attachment II. Attachment II includes the Geotechnical Investigation conducted by CTL <br />Thompson for the project and information concerning slope stability, slurry wall and pit floor <br />construction recommendations. <br />Conceptual Slurry Wall Construction Plan <br />The following Conceptual Slurry Wall Construction Plan is based on a paper by C.R. Ryan and <br />S.R Day, Titled "Soil-Bentonite Slurry Wall Specification", Geo-Solutions Inc., Pan American <br />Conference on Soil Mechanics and Geotechnical Engineering, Geo-Institute and MIT, <br />Cambridge, MA, June 2003. <br />1. Slurry Parameters <br />• Slurry Test Methods; <br />? The following field testing methods will be performed according to ASTM <br />specifications and at a frequency as recommended in the Division's guide titled <br />"Guide to Specification Preparation for Slurry Walls and Clay Liners as a <br />Component of a Colorado Mined Land Reclamation Permit": <br />? Viscosity-Marsh Funnel <br />? Unit Weight -Mud Balance <br />? Filter Press <br />? Sand Content <br />• Slurry Properties When Freshly Mixed: <br />? The Viscosity-Marsh Funnel test will be performed to determine the properties of <br />the freshly mixed slurry as to viscosity. Viscosity is related to bentonite type, <br />content and degree of hydration. Unless otherwise indicated, the <br />Application/Operator will specify the use of "standard" 90 barrel yield bentonite <br />as specified in API Publication 13A, Section 5. <br />C