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Transit Mix Concrete Co. <br /> Response: Transit Mix commits to performing controlled blasting practices to minimize <br /> damage to the final quarry walls. <br /> 24. As recommended in Section 6.4 of the Hitch Rack Ranch Pit Wall Geotechnical <br /> Assessment, dated September 11, 2017, please commit to clearing berms of rock and <br /> debris to the extent possible while access is possible, and performing scaling of pit wall <br /> bench faces in order to minimize potential raveling and rock fall hazards. <br /> Response: Transit Mix commits to maintaining pit wall benches and slopes while <br /> accessible to minimize raveling and rock fall hazards. <br /> 25. As recommended in Section 6.4 of the Hitch Rack Ranch Pit Wall Geotechnical <br /> Assessment, dated September 11, 2017, please commit to performing routine bench face <br /> mapping by a qualified personnel on a monthly basis during the initial development, to <br /> match the rock mass quality and structural geology against the design assumptions <br /> throughout quarry development. <br /> Response: Transit Mix commits to routine mapping of the bench faces for rock mass <br /> quality and structural information by a qualified person. Transit Mix will submit for <br /> Division review the data and results as a technical revision or amendment. <br /> 26. As recommended in Section 6.4 of the Hitch Rack Ranch Pit Wall Geotechnical <br /> Assessment, dated September 11, 2017, please commit to performing visual inspections <br /> of the pit slopes by a qualified personnel to identify blast damage and modify blasting <br /> techniques, as required to be completed immediately after scaling is completed and the <br /> bench face is visible. <br /> Response: Transit Mix commits to visual inspections of the pit slopes for blast damage by <br /> a qualified person and commits to modifying the blasting techniques as necessary. <br /> 27. As recommended in Section 6.4 of the Hitch Rack Ranch Pit Wall Geotechnical <br /> Assessment, dated September 11, 2017, please commit to conducting routine pit slope <br /> movement monitoring with EDM/Prism surveying, laser scanning, and/or extensometers <br /> during the initial mining development and as final highwalls are developed. <br /> Response: Transit Mix commits to installing and maintaining a pit wall monitoring system. <br /> 28. As recommended in Section 6.4 of the Hitch Rack Ranch Pit Wall Geotechnical <br /> Assessment, dated September 11, 2017, please commit to performing routine visual <br /> inspection by a qualified personnel to assess pit slope stability, catchment benches, <br /> berms, clean-up efforts, restricted access points, and monitoring systems. The inspection <br /> should be completed daily and communicated to the site personnel, and the inspections <br /> should be documented and stored at the site for review. <br /> Response: Transit Mix commits to daily visual inspections of the pit slopes and benches by <br /> a qualified person to assess pit slope stability, catchment benches, berms, clean-up efforts, <br /> Hitch Rack Ranch Quarry(M-2017-049) <br /> Response to Comments—March 9,2018 <br />