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Executive Summary TABLE ES-1 (CONTINUED) SUMMARY OF IMPACTS AND MITIGATION MEASURES Environmental Impact Mitigation Measures Level of Significance (Level of Significance Prior to Mitigation) After Mitigation 4.7.2 Activities related to quarry operations that cause No mitigation is required. disturbance of surface soils would expose loose soil materials. Exposure of these soils to wind,rain,and concentrated runoff could cause localized erosion that could eventually damage the engineered earthen features. Erosion damage to these features could expose workers to injury and equipment to damage.This would be a less-than-significant impact.(LS) 4.7.3 Permanent reclamation slopes could be subjected to No mitigation is required. excessive soil erosion,resulting in riling,gullying,debris flows, and berm damage.This would be a less-than-significant impact given the project's erosion control plan.(LS) 4.7.4 In the event of a major earthquake,seismic ground 4.7.4 Earthquake Preparedness and Response Plan.Prior to Less than Significant shaking could potentially injure people and cause commencement of mining,the applicant staff shall complete an collapse or structural damage to proposed structures. Earthquake Preparedness and Response Plan(EPRP)to address This would be a potentially significant impact.(PS) worker safety and plant operation status during and following a major earthquake.The EPRP shall be included or become a supplementary document to the standard site health and safety plan.The EPRP shall be prepared, implemented,and self-monitored by the applicant.The EPRP shall include pre-earthquake and post-earthquake preparedness requirements for the facility that include • Emergency evacuation routes to clear people of unsafe equipment and buildings, • Requirements for securing equipment likely to topple or undergo severe damage during an earthquake including procedures to avoid topple of furniture and small equipment, • Communication protocol during and following an earthquake, • Location of emergency equipment and first aid, • Transportation routes, • List of on-site contacts, • Procedures to locate and account for on-site personnel, • List of current phone numbers for San Joaquin County sheriff and fire prevention,and City of Tracy Fire and Rescue,and • Post-earthquake facility structure and quarry pit inspections. Cemax Vernalis Quarry Mining and Reclama0on Project ES-12 ESA /203015 Final Environmental Impact Report June 2008 1 1 1 _ L l _. 1 I