75B - PH ADOPT RESO FOR PR NO 15-6827

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NT MENTS INITIAL STUDYiMITIGATED NEGATIVE DECLARATION FAIRVIEW BPIOGE REVLACEM REST TO STREET BEET) PROJECT L S A MAY 2020 (9Tx STREET To ANTx STREET) L, OREGT SANTA ANAL CALIFOPHIA particles would settle near the source, while finer particles would be dispersed over greater distances from the construction site. In addition to dust -related PM10 emissions, heavy trucks and construction equipment powered by gasoline and diesel engines would generate CO, NOx, ROG, and some soot particulate (PM2.5 and PM,o) in exhaust emissions. If construction activities were to increase traffic congestion in the area, CO and other emissions from traffic would increase while those vehicles are delayed. These emissions would be temporary and limited to the immediate area surrounding the construction site. Areas within 500 feet (ft) of California Air Resource Board (CARB) defined sensitive land uses would be labeled as no -idle areas where material storage/transfer and equipment maintenance activities are not to occur. S02 is generated by oxidation during combustion of organic sulfur compounds contained in diesel fuel. Off -road diesel fuel meeting federal standards can contain up to 5,000 parts per million (ppm) of sulfur, whereas on -road diesel is restricted to less than 15 ppm of sulfur. However, under State law and CARB regulations, off -road diesel fuel used in California must meet the same sulfur and other standards as on -road diesel fuel, so S02-related issues due to diesel exhaust would be minimal. The construction emissions were estimated for the proposed Project using the Sacramento Metropolitan Air Quality Management District's Road Construction Emissions Model, Version 9.0.0, which is consistent with the guidance provided by the SCAQMD for evaluating construction impacts from roadway projects. The maximum amount of construction -related emissions during a peak construction day is presented in Table 3.3.13. The PM10 and PM2.5 emissions assume a 50 percent control of fugitive dust as a result of watering and associated dust -control measures.' The Project construction emissions presented below are based on the best information available at the time of calculations and specify that the schedule for Project construction is anticipated to take approximately 2 years. As shown in Table 3.3.6, with the implementation of standard construction measures (providing 50 percent effectiveness) such as frequent watering (e.g., a minimum of twice per day), construction emissions associated with the proposed Project would be less than significant for ROG, CO, PM10, and PM2.5 emissions; however, NOR emissions would exceed the SCAQMD threshold, resulting in a potentially significant impact. Additional emission reduction methods such as applying water or a dust palliative, a dust control plan, track -out reduction measures, equipment maintenance, spill control, and reducing vehicle idling are necessary to avoid substantial criteria pollutant impacts. Mitigation Measure AQ-1 includes these emission reduction methods and an additional measure to require cleaner engines. Table 3.3.0 shows the proposed Project's mitigated construction emissions. 7 South Coast Air Quality Management District. 2007. Fugitive Dust Mitigation Measure Tables. TableXPA: Construction & Demolition. Website: http://www.agmd.gov/home/rules-compliance/ceqa/air-quality- analysis-handbook/mitigation-measures-and-control-efficiencies/fugitive-dust (accessed November 2019). R:\WKE1702\ISMND\Fina1 ISMND\Fairview Street Bridge Final ISMN07n043 3-9