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Mitigation Measure 4.5-2b (Alternatives 1, 2, and 3) The proponent shall implement the following mitigation measure for the control of ozone precursor emissions (ROG and NOJ during the operational phase of the project in accordance with the recommendations of the SJVUAPCD: All on-site equipment qu pment dnven by internal combustion engines shall be properly maintained and well tuned according to manufacturers'specifications. Maintenance records demonstrating this shall be kept on-site by the proponent and shall be made available to the County upon request. Mitigation Measure 4.5-2c (Alternatives 1, 2, and 3) Construction and operation of the proposed facilities shall include emission i reduction techniques in accordance with the applicable rules, regulations, and permitting requirements of the SJVUAPCD for the reduction of regional plant emissions. Level of Significance After Mitigation: Implementation of Mitigation Measures 4.5-2a, 2b, and 2c would reduce emissions of fugitive dust, regional mobile source emissions, and regional plant emissions, but would not reduce impacts to a less-than-significant level. Therefore, the regional operational emissions for Alternatives 1, 2 and 3 would be significant and unavoidable. Impact 4.5-3 Local Mobile Source Impact (CO) The primary mobile source pollutant of local concern is CO. Carbon monoxide concentration is a direct function of vehicle idling time, so it is influenced by traffic flow conditions. Carbon monoxide transport is extremely limited; it disperses rapidly with distance from the source under normal meteorological conditions. However, under certain meteorological conditions, CO concentrations close to a heavily congested roadway or ; intersection may reach unhealthful levels, affecting local sensitive receptors (residents, school children, hospital patients, the elderly, etc.). Typically, high CO concentrations are associated with roadways or intersections operating at unacceptable levels of service. In areas where sensitive receptors may be exposed to potentially high ambient background CO concentrations, modeling of CO concentrations is recommended in determining a project's effect on local CO levels. All.Quarry Excavation Alternatives (1. 2. and 3) Projected pollutant emission rates associated with mining, reclamation, and transport activities would remain essentially the same for Alternatives 1, 2, and 3. Equipment types, Draft Environmental Impact Report 4-78 ER-96-3