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•�:y� 33u � .....,.-b`Ws«' Level of Significance Level of Significance Environmental Impact Before Mitigation Mitigation Measures After Mitigation LS S LS SU Mitigation Measure 4.2-3b(A-1,A-2&A-3) y _ Annual inspection by the County of the completed reclamation areas shall specifically evaluate the effectiveness of vegetative cover in preventing erosion, The inspections shall identify areas of reclaimed slopes on which significant soil surface is bare of vegetation or where rill or gully formations are occurring,and any areas of significant soil slides or other disruptions of the final slope surface. The proponent shall be notified of any identified problems and required to remediate these areas prior to the next annual inspection,or immediately,if deemed necessary by the County inspection. If an erosion or revegetation problem is identified in the same area for two consecutive years,the proponent shall submit,for approval by Development Services Division,a revised reclamation plan which provides for reduced slope steepness or alternative measures for controlling identified problems. if reduction of slope steepness is required,the proponent shall identify the source of any necessary fill materials and amend the Financial Assurances for the project to address any necessary financing to place the fill, N Impact 4.2-4 A-4 A-1,A-2& Mitigation Measure 4.2-4a(A-1,A-2&A-3) All Alts. Capacity of Proposed Processing A-3 Basins may be Inadequate Prior to commencement of mining-at the project site, the proponent shall submit for approval by the Development Services Division,calculations and engineering drawings prepared by a licensed engineer that demonstrate that the proposed processing wastewater basins are capable of storing expected wastewater discharge and precipitation. Impact 4.2-5 Alt Alts. None required Decreased Availability of Aggregate Resources Impact 4.2-6.,-.,, ^. _ A-4 A-1,A-2& Mitigation Measure 4.2-6a(A-1,A-2&A-3) All Alts. Elevated Levels Could A-3 Affect Post-FleclamationAgricutture The maximum depth of mining shall be a minimum of six feet above the seasonal high water level. As a basis for initial and ongoing mining depths,the proponent shall submit annually the results of quarterly monitoring reports to the Department Services Division which document the groundwater elevations for a minimum of ten water supply wells around the general perimeter of the permitted mining area. In the event that the proponent is unable to obtain or retain measurements from at least ten existing water wells, the proponent shall procure new wells for monitoring purposes at locations acceptable to the Development Services Division, The proponent shall provide a verifiable bench mark at each well site that can be referenced for compliance monitoring. Based on the water depth monitoring reports,Development Services Division may recalculate the expected high groundwater elevation, thereby adjusting the maximum depth of mining. LS=less than significant A-1 =Proposed Project S=significant A-2=Proposed Project with Alternate Northern Access Road SU=significant and unavoidable A-3=Proposed Project with Alternate Southern Access Road to New Interchange A-4=No Project