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safely to the nearest natural drainage. This system is being installed to maximize the stability of <br /> these repaired slopes. The Geotechnical Stability Exhibit contains a detailed analysis by Ground <br /> Engineering regarding slope stability and subsurface drainage. Maps C-4 and C-5 show the <br /> surface and subsurface water systems to be installed in the slide area. <br /> Ground Engineering will be onsite during construction of the slide area remediation and will <br /> certify the construction as quality assurance/control personnel. A quality control plan will be <br /> provided to DRMS prior to construction. <br /> 1.1.1 Monitoring <br /> The slide area will be monitored following slope stability construction activities. This monitoring <br /> will consist of visual inspections and surveys conducted by APC and Ground Engineering. APC <br /> will inspect the area weekly following construction. If any emergency conditions, such as further <br /> failures, are discovered, DRMS will be immediately contacted. General inspection conditions <br /> and survey results will be summarized and report to DRMS in the annual reclamation report. <br /> Ground Engineering will conduct a detailed inspection, and a GPS survey of the slide area will <br /> be conducted, twice a year for two years. <br /> As-builts of the final slope, its stability and stormwater structures will be provided to DRMS <br /> once all structures have been completed. <br /> 2. Topsoil Replacement <br /> The screened topsoil material will be used for topsoiling disturbed areas and building the <br /> vegetation islands along the western slope of the reservoir(see Map C-3). All areas other than <br /> the quarry slopes and benches will be covered in the screened material to a 12-inch depth. The <br /> benches will have topsoil on the vegetation islands that will be created as shown on Map C-3. <br /> Ralston Quarry CrM 1r idu aad An iaka,PLLC <br /> January 2019 E-2 <br />