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<br /> Level of Significance Level of Significance
<br /> Environmental Impact Before Mitigation Mitigation Measures After Mitigation
<br /> LS S LS SU
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<br /> Impact 4.2-1 All Alts. None required.
<br /> Compression or Consolidation of
<br /> Sediments
<br /> impact 4.2-2 A-4 A-1,A-2& Mitigation Measure 4.2-2a(A-1,A-2&A-3) All Alts.
<br /> Slope Stability A-3
<br /> The maximum steepness of the proposed excavation slopes shall be reduced to meet the County
<br /> requirements for slope steepness and factor of safety. If slopes steeper than 1:1 are proposed for the
<br /> reduced slopes, the proponent shall submit a site-specific geologic and engineering analysis that
<br /> demonstrates(through slope stability analysis)that the revised slope design will have a minimum
<br /> factor of safety of 1.5 under static conditions and 1.1 under seismic failure.
<br /> N Mitigation Measure 4.2-2b(A-1,A-2&A-3)
<br /> If strong seismic shaking is experienced at the project site as the result of a moderate to large
<br /> earthquake(M fi or greater)along the CRSBBZ,then the project site shall be inspected by a qualified
<br /> licensed civil or geotechnical engineer to determine if liquefaction or seismic subsidence has occurred
<br /> and resulted in visible damage to reclaimed lands. A report,including recommendations to repair any
<br /> damage that may have occurred,shall be submitted to the Development Services Division for review
<br /> and approval, Upon approval by the Development Services Division, the proponent shall implement
<br /> the recommendations set forth in the report.
<br /> Mitigation Measure 4.2-2c(A-1,A-2&A-3)
<br /> Pursuant to Section 9-1415.2(k)(3)of the Development Title,if an approved slope does not remain
<br /> stable,and an inspection confirms this condition, the Review Authority shall have the authority to
<br /> reduce the slope or require other appropriate measures to correct any deteriorated slope. The
<br /> operator of the site shall be responsible for the cost of such corrective actions.
<br /> Impact 4.2-3 A-4 A-1,A-2& Mitigation Measure 4.2-3a(A-1,A-2&A-3) All Alts.
<br /> Erosion of Post-Reciamatton Slopes A-3
<br /> Runoff from off-site areas shall be controlled in a manner to prevent such Bows from entering the
<br /> mining area- These controls could include drainage ditches and/or berms that would route water away
<br /> from the tops of the proposed excavation and mining slopes. A drainage plan shall be prepared by a
<br /> qualified and licensed engineer which provides runoff control and submitted to the Development
<br /> p Services Division prior to the commencement of mining.
<br /> LS=less than significant A-1 =Proposed Project
<br /> S=significant A-2=Proposed Project with Alternate Northern Access Road
<br /> SU=significant and unavoidable A-3=Proposed Project with Alternate Southern Access Road to New Interchange
<br /> A-4=No Project
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