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where such standards are deemed necessary to address risks remaining after implementation of the technology- based NESHAP standards. The 1990 amendments to the CAA required the EPA to promulgate vehicle or fuel standards containing reasonable requirements to control toxic emissions,applying at a minimum to benzene and formaldehyde. Performance criteria were established to limit mobile-source emissions of toxics,including benzene, formaldehyde, and 1,3-butadiene. Section 219 of the CAAA also required the use of reformulated gasoline in selected U.S.cities(those with the most severe 03 nonattainment conditions)to further reduce mobile-source emissions,including toxics. STATE REGULATIONS Criteria Air Pollutants _ The ARB is the agency responsible for coordination and oversight of state and local air pollution control programs in California and for implementing the CCAA. The CCAA requires air districts in the state to endeavor to achieve and maintain the CAAQS by the earliest practical date. The act specifies that districts should focus particular attention on reducing the emissions from transportation and area-wide emission sources,and provides districts with new authority to regulate indirect sources. Each district plan is to achieve a 5%annual reduction,averaged over consecutive 3-year periods,in district-wide emissions of each nonattainment pollutant or its precursors. Any additional development within the region obviously would impede the reduction goals of the CCAA. The ARB is primarily responsible for developing and implementing air pollution control plans to achieve and maintain the NAAQS,with emphasis on statewide pollution sources. However,local air districts are still relied on to provide additional strategies for sources under their jurisdiction. The ARB combines this data and submits the completed SIP to the EPA. Other ARB duties include monitoring air quality(in conjunction with air monitoring networks maintained by air pollution control and air quality management districts),establishing CAAQS (which in many cases are more stringent than the NAAQS),and setting emissions standards for new motor vehicles. The emission standards established for motor vehicles differ, depending on various factors,including the type of vehicle,model year,fuel, and engine used. The ARB has recently adopted new diesel exhaust control measures and more stringent emission standards for various on-road mobile sources of emissions,including transit buses. In February 2000,ARB adopted a new public transit bus-fleet rule and emission standards for new urban buses. These new rules and standards provide for (1)more stringent emission standards for some new urban bus engines beginning with 2002 model year engines; (2)zero-emission bus demonstration and purchase requirements applicable to transit agencies; and(3)reporting requirements with which transit agencies must demonstrate compliance with the urban transit bus-fleet rule. Toxic Air Contaminants The ARB works in partnership with the local air districts to enforce regulations that reduce TACs in the state. The ARB has authority for motor vehicles,fuels,and consumer products. The ARB identifies the TACs,researches prevention or reduction methods,adopts standards for control,and enforces the standards.PM emissions from diesel-fueled vehicles and engines are the primary TACs of concern for mobile sources. Of all controlled TACs, diesel PM emissions are estimated to be responsible for about 70%of the total ambient TAC risk(ARB 2000). The ARB has made the reduction of the public's exposure to diesel PM one of its highest priorities,with an aggressive plan to require cleaner diesel fuel and cleaner diesel engines and vehicles(ARB 2002). The local air districts have the authority over stationary or industrial sources. SJVAPCD Rule 2010 requires permits for all source operations that may emit TACs. All projects that require air quality permits from the College Park at Mountain House Specific Plan III Draft EIR EDAW San Joaquin County 4.12-11 Air Quality