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a Transit Mix Concrete Co. <br /> DRMS COMMENTS— PETER HAYS —REVIEW OF EXHIBIT 6.5— <br /> GEOTECHNICAL STABILITY <br /> Hitch Rack Ranch Quarry Waste Stockpile Analyses: <br /> 1. Please explain how the downhill toe of the F 1 -Fines/Overburden Stockpile will be <br /> stabilized to prevent potential downgradient movement of the stockpile. Please provide <br /> geotechnical investigation data and details for the starter dam/embankment/retaining wall <br /> design, if available. <br /> Response: The toe of the F1 fines/overburden stockpile will be sloped from angle of <br /> repose (L7H:IV) to 3H:IV as the stockpile is completed. Reclamation and seeding will be <br /> completed on the regraded area upon completion of sloping. The stockpile design does not <br /> include a starter dam, embankment, or retaining wall. There is also a sediment detention <br /> basin located below the toe of stockpile Fl, and any sediment will be contained in the <br /> basin. <br /> 2. Please provide a cross-section through F2 and F3 Fines/Overburden Stockpiles during <br /> Mining Phase V and the Final Reclamation Phase to clarify the interaction between the <br /> two stockpile areas. <br /> Response: Cross-sections through F2 and F3 during mining Phase V and during the <br /> reclamation phase have been added to Exhibit C as additional information in Figure C-9c. <br /> 3. Please provide the SLOPE/W data for the Waste Stockpile Stability Analyses SLOPE/W <br /> performed by Norwest to allow the Division to duplicate the analysis with Clover <br /> Technology's Galena software for verification purposes. <br /> Response: The SLOPE/W model files have been exported as DXF files and Point Cloud <br /> CSV files. The strength parameters for each material are included in an Excel file. <br /> 4. In the Soil Properties section of the stability analyses, the site specific geotechnical <br /> information on the overburden is limited to the visual inspection done in the drilling <br /> programs. Please commit to collecting and testing the overburden to determine the actual <br /> strength parameters and submit the material parameters report for Division review and <br /> approval through either the technical revision or amendment process, to occur subsequent <br /> to the issuance of the permit. <br /> Response: Transit Mix commits to collecting the geotechnical information and revising <br /> the geotechnical assessment with the site-specific information. Transit Mix will submit for <br /> Division review the data and results as a technical revision or amendment. <br /> 5. Please commit to collecting and testing the topsoil, fine reject, and compacted engineered <br /> sand and gravel to determine the actual strength parameters, and submit the material <br /> parameters report for Division review and approval through either the technical revision <br /> or amendment process, to occur subsequent to the issuance of the permit. <br /> Hitch Rack Ranch Quarry(M-2017-049) <br /> Response to Comments—March 9,2018 <br />