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��}? <br /> , Transit Mix Concrete Co. <br /> Response: Transit Mix commits to collecting the mapping and drilling information and <br /> revising the geotechnical assessment with the site-specific information. Transit Mix will <br /> submit for Division review the data and results as a technical revision or amendment. <br /> 19. In 3.7.2 Faulting section of the geotechnical assessment, the Applicant states given the <br /> Phase 1 pit configuration (relatively shallow highwalls during initial mining of Phase 1), <br /> it is expected that adverse dips can be addressed by adjusting the mining sequence and <br /> direction. Please describe how the Applicant intends to adjust the mining sequence and <br /> direction to address the impacts of the faults on the highwall stability. <br /> Response: Adjusting the mining sequence addresses potential instabilities that can occur <br /> within the pit during the mining process. Faults or adverse structures can cause issues <br /> internal to the pit during the mining process which are often overlooked by only analyzing <br /> the final pit walls. The final wall design needs to, and this design does, account for adverse <br /> structures/faulting, but there can also be issues during mining within the pit that need to be <br /> addressed. The sequencing and direction of mining can be important in mitigating these <br /> risks during operations. <br /> 20. As recommended in Section 6.4 of the Hitch Rack Ranch Pit Wall Geotechnical <br /> Assessment, dated September 11, 2017, please commit to implementing water <br /> management procedures to divert surface runoff away from the pit walls. <br /> Response: Transit Mix commits to implementing and maintaining a water management <br /> system that minimizes runoff on the pit walls. <br /> 21. As recommended in Section 6.4 of the Hitch Rack Ranch Pit Wall Geotechnical <br /> Assessment, dated September 11, 2017, please commit to installing instrumented <br /> groundwater monitoring wells behind highwalls where natural topography continues <br /> above the pit crest. <br /> Response: Transit Mix commits to installing geotechnical monitoring instrumentation <br /> where the natural topography extends above the pit crest. <br /> 22. As recommended in Section 6.4 of the Hitch Rack Ranch Pit Wall Geotechnical <br /> Assessment, dated September 11, 2017, please commit to consequent investigations <br /> (mapping and drilling)to determine if adversely dipping low angle faults are present. <br /> Response: Transit Mix commits to collecting the mapping and drilling information and <br /> revising the geotechnical assessment with the site-specific information. Transit Mix will <br /> submit for Division review the data and results as a technical revision or amendment. <br /> 23. As recommended in Section 6.4 of the Hitch Rack Ranch Pit Wall Geotechnical <br /> Assessment, dated September 11, 2017, please commit to performing controlled blasting <br /> practices to minimize damage to the final quarry walls. <br /> Hitch Rack Ranch Quarry(M-2017-049) <br /> Response to Comments—March 9,2018 <br />