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Significance Significance Impact before after Mitigation Mitigation Hydrology and Water Quality: Groundwater seepage could cause Potentially Less than groundwater losses due to evaporation,threaten groundwater quality, Significant Significant and disrupt mining and future reuse operations. Hydrology and Water Quality:Accidental spill,leaks,or improper Potentially Less than disposal of petroleum fuel would increase the potential for Significant Significant degradation of groundwater quality over the life of the project. Hydrology and Water Quality:Excavation that disturbs and/or Potentially Less than truncates the existing groundwater well shafts on the project site could Significant Significant increase the potential for contaminants to enter and pollute the groundwater through the wells. Hydrology and Water Quality: Mining out Hospital Creek could ]Jg inificant Significant substantially alter the natural hydrology of Hospital Creek. Biological Resources:Project activities could potentially result in otentially Less than direct and indirect impacts to"waters of the U.S.". gnificant Significant Biological Resources:Project activities could result in adverse Potentially Less than impacts to special status-species covered under the SJMSCP. Significant Significant Cultural Resources: Damage to previously unidentified buried Potentially Less than archaeological retrains could occur during project construction. Significant Significant Cultural Resources:Damage to previously unidentified human Potentially Less than remains could occur during project construction. Significant Significant Hazards and Hazardous Materials: Existing and/or previously Potentially Less than unidentified contamination could be encountered during project Significant Significant activities. Hazards and Hazardous Materials:Accidental spill of a miscellaneous Potentially Less than hazardous substances used on site could pose both a hazard to Significant Significant construction employees as well as the environment Hazards and Hazardous Materials:Exposure of the existing and future Potentially Less than residents near the project area to potentially high levels of nuisance Significant Significant and disease vectoring mosquitoes from the addition of silt ponds and mining pits that could contain storm water on the project site would be a significant health hazard. Visual Resources: Implementation of the project has the potential to Potentially Less than conflict with adopted plans and policies relating to visual resources. Significant Significant Summary Of Cumulative Impacts The proposed project would result in significant and unavoidable cumulative impacts in the following areas: • Air Quality: The project will result in increased traffic volumes that in turn will cause an incremental effect on air quality that is cumulatively considerable when considered along with past,present, and future projects in the project area. The combined impact of those projects on air quality would be a significant impact. • Noise: Traffic noise levels resulting from the increase in traffic volumes associated with operation of the mine will be cumulatively considerable when considered along with past, present, and future projects in the project area,which will result in increased noise levels at residences located along truck haul routes. The cumulative impact would be significant. 3 Notice of DIER Availability