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District CEQA Reference leo ; 20180096 Page 2 of 6 sulfur ( SOx) , 15 tons per year of particulate matter of 10 microns or less in size ( PM10 ) , or 15 tons per year of particulate matter of 2 . 5 microns or less in size ( PM2 . 5 ) . i ) Recommended Mitigation Measure if needed: To reduce Impacts from construction related exhaust emissions , the District recommends feasible mitigation for the Project to utilize off road construction fleets that can achieve fleet average emissions equal to or cleaner than the Tier III emission standards , as set forth in § 2423 of Title 13 of the California Code of Regulations , and Part 89 of Title 40 Code of Federal Regulations . This can be achieved through any combination of uncontrolled engines and engines complying with Tier III and above engine standards . b ) Operational Emissions : Operational Emissions : Permitted ( stationary sources ) and non - permitted ( mobile sources ) sources should be analyzed separately . For reference , the annual criteria thresholds of significance for operation of permitted and non - permitted sources each are : 100 tons per year of carbon monoxide ( CO ) , 10 tons per year of oxides of nitrogen ( NOx) , 10 tons per year of reactive organic gases ( ROG ) , 27 tons per year of oxides of sulfur ( SOx) , 15 tons per year of particulate matter of 10 microns or less in size ( PM10 ) , or 15 tons per year of particulate matter of 2 . 5 microns or less in size ( PM2 . 5 ) . Recommended Mitigation Measure (if needed) : Project related impacts on air quality can be reduced through incorporation of design elements , for example , that increase energy efficiency , reduce vehicle miles traveled , and reduce construction exhaust related emissions . However , design elements and compliance with District rules and regulations may not be sufficient to reduce project related impacts on air quality to a less than significant level . Another example of a feasible mitigation measure is the mitigation of project emissions through a Voluntary Emission Reduction Agreement (VERA) . The VERA is an instrument by which the project proponent provides monies to the District , which is used by the district to fund emission reduction projects that achieve the reductions required by the lead agency . District staff is available to meet with project proponents to discuss a VERA for specific projects . For more information , or questions concerning this topic , please call District Staff at ( 559 ) 230 -6000 . Recommended Model : Project related criteria pollutant emissions from construction and operation non - permitted ( limited to equipment not subject to District permits ) should be Identified and quantified . Emissions analysis should be performed using CaIEEMod ( California Emission Estimator Model) , which uses the most recent approved version of relevant Air Resources Board (ARB )