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had catalyzed particulate filters, with a DPM control efficiency of 85 percent,the maximum incremental lifetime cancer risks would be 7 and 9 cancers per million(assuming a 70-year exposure) and between 4 and 8 cancers per million(assuming a 20-year exposure) under the 1.7 and 4 million production rates. Implementation of this mitigation would reduce project cancer risk impacts to a less-than significant impact. See Final EIR,pp. 4-39 to 4-45. Mitigation Measures: Mitigation Measure 4.6.4a: The applicant shall either utilize new model year on-site machinery equipped with the best available DPM control technology, or retrofit its fleet of excavators, on-site haul trucks, and front end loaders with catalyzed DPM filters to minimize DPM emissions, or, in those limited instances where the retrofit would impede the function or life of the equipment, or presents safety concerns, the applicant shall comply with alternative measures developed by the Air Board. (Final EIR, p. 4-44.) Mitigation Measure 4.6.4b: Implement Mitigation Measure 4.6.1. (Final EIR,p. 4-44.) Findings: Based on the whole record, this Commission finds that with implementation of Mitigation Measures 4.6.4a-b, impacts related to toxic air contaminants are reduced to a less than significant level. D.2.6. Geology, Soils, and Seismicitv Impact 4.7.4 In the event of a major earthquake, seismic ground shaking could potentially injure people and cause collapse or structural damage to proposed structures. (Draft EIR,p. 4.7-22.) Significance Before Mitigation: Potentially Significant. Facts: 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 be less than significant. See Draft EIR, pp. 4.7-22 to 4.7-24. Mitigation Measures: Mitigation Measure 4.7.4: Earthquake Preparedness and Response Plan. Prior to commencement of mining, the applicant staff shall complete an Earthquake Preparedness and 17