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tow assuming this control efficiency for all fugitive dust emissions, this would result in total mitigated fugitive dust PM10 emissions of 911b/hr or 7291b/day during site ` preparation. (See Table A-1.) The construction emissions of 729 lb/day after implementation of all mitigation measures by far exceed the quantitative significance thresholds set by other air districts in California, indicating that mitigated fugitive dust emissions B-22 from Project site preparation would result in significant adverse impacts on air cont. ` quality. This is a new significant impact that was not disclosed in the Draft EIR. If ambient air quality modeling of fugitive dust construction emissions were performed, resulting ambient air PM10 concentrations would likely exceed or contribute to existing violations of ambient air quality standards. Fugitive dust L emissions associated with Project construction would therefore significantly contribute to the already severe PM10 problem in the San Joaquin Valley air basin.74 The Draft EER fails to disclose this significant impact. III.0 Additional Feasible Measures Exist and Should Be Required To Mitigate Construction PM 10 Impacts CEQA requires a lead agency to adopt all feasible mitigation measures or r feasible project alternatives that can substantially lessen or avoid any significant effects on the environment associated with a project to be approved. (Pub. Res. Code, §21002.) If, and only if, after implementation of all feasible mitigation 6. measures project emissions are still significant, the lead agency may adopt a statement of overriding considerations. 8-23 Accordingly, the SJVAPCD requested in its comments on the Notice of Preparation for the Draft EIR that"[mjitigation measures must be included in the EIR that reduce the emissions of reactive organic gases (ROG), nitrogen oxides, ` carbon monoxide, and PM-10 to the maximum extent feasible." Specifically, the District "strongly recommends that the project applicant... implement all feasible mitigation ` measures to reduce the amount of ozone precursors that will result from the buildout of this project. In this letter, the District provided a list of potential mitigation measure and emphasized that"the list is not meant to be all inclusive, and the District 6. encourages new innovative ideas." (SJVAPCD 01/0315, p. 2;emphasis added.) The Draft EIR for the most part ignored the District's request as well as the CEQA Guidelines. 14 The San Joaquin Valley air basin is serious non-attainment for the federal ambient air quality L standard and non-attainment for the state ambient air quality standard for PM10. 15 San Joaquin Valley Air Pollution Control District,Re:Notice of Preparation for the Environmental Impact Report for RMC Pacific Materials-Quarry Excavation,January 23,2003. L 13 L