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4. ENVIRONMENTAL ANALYSIS 4.7 GEOLOGY,SOILS,AND SEISMICrrY - At the proposed project site,the ground shaking generated by a moderate to strong earthquake — could cause failure on temporary and permanent excavation slopes (as discussed previously)and cause some equipment damage. Specifically,equipment at the processing plant could undergo structural damage and depending on the foundation type,some equipment could topple. Haul — roads may also undergo localized failure during an earthquake. Equipment damage could injure site workers and visitors to the quarry. Avoiding earthquake damage to the processing plant equipment,the batch plant,associated portable offices,and other related equipment depends on the structural stability and the performance of these structures during strong ground shaking. The design and construction of — certain buildings may require conformance with seismic design criteria set forth by the California Building Code(CBC)while other structures are considered portable,temporary structures or processing equipment may not subject to the CBC seismic design criteria. — Earthquakes are unavoidable and although infrequent,could at some time during the life of the project,cause worker injury and equipment damage. Structures related to quarry operations that are required to comply with the CBC seismic design criteria for this area would likely experience minor damage and remain stable. Other equipment, such as portable offices or temporary processing equipment could cause injury if substantially damaged during ground shaking. However,although some structural damage may occur,the overall risk to workers is considered low because if an earthquake was to occur during working hours,many of the 40 employees on the site would be operating equipment or be within structures that could withstand ground shaking. Regardless, the following mitigation measure would further ensure that adverse impacts associated with earthquake ground shaking remain less-than-significant. _ Mitigation Measure 4.7A: Earthquake Preparedness and Response Plan Prior to commencement of mining,the applicant shall complete an Earthquake Preparedness and Response Plan (EPRP)to address worker safety and plant operation status during and following a major earthquake. The EPRP shall be included incorporated 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. A California certified engineering geologist and California registered structural engineer with experience in seismology and earthquake preparedness shall — assist the applicant in preparation of the EPRP. The EPRP shall include pre-earthquake and post- earthquake preparedness requirements for the facility that includes but is not necessarily limited to: — • 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, RMC Pacific Vemahs Quay Mining and Reclamation Project 4.7-26 ESA 20307 s Ad®is4 w Dmft EIR March 2004