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4.Environmental Analysis — equipment, locomotives, and marine diesels. Because these emission standards have only been — proposed at this time,their benefits were not accounted for in the analysis presented in this EIR. As proposed, the new engine standards for nonroad trucks would take effect in 2008. The U.S. — EPA estimates that PM would be reduced 95 percent, NOx would be reduced 90 percent, and SOX would be virtually eliminated as an emission from this source. Sulfur in nonroad diesel fuel would be reduced 99 percent from existing levels. In June 2007,the interim cap of sulfur content for fuel for nonroad sources would be 500 ppm. In June 2010, sulfur would be limited to 15 ppm (ultra low sulfur fuel). The Tier 1 emission standards for nonroad diesel engines were set in 1994 and affect engines greater than 50 horsepower(hp). The Tier 2 and Tier 3 standards were set in 1998 and affect engines less than and greater than 50 hp. The new standards would affect engines ranging from 3 to 3,000 hp.Again,the U.S. EPA is proposing a"tiered"method of implementing the standard based on the engine capacity of the equipment. Current regulations apply emission standards to heavy-duty diesel truck and bus engines manufactured from 1987 through 2003. Applicable to the 1994 and following year standards, — sulfur content in the certification fuel has been reduced to 500 ppm. In October 1997, U.S. EPA adopted new emission standards for 2004 and later heavy-duty diesel truck and bus engines. — These standards reflect the provisions of the Statement of Principles signed in 1995 by the U.S. EPA,CARB, and the manufacturers of heavy-duty diesel engines.The goal is to reduce NO. emissions from highway heavy-duty engines to levels approximately 2.0 grams per brake _ horsepower-hour(g/bhp-hr) (beginning in 2004).' These current emission standards were accounted for in this analysis. Stationary Source Controls Regulatory approaches of TACs differ between stationary sources and mobile sources. The — Valley Air District limits emissions of and public exposure to TACs through a number of programs. The potential for new and modified stationary sources to emit TACs is reviewed by the Valley Air District's Permit Services Division, which implements the Valley Air District's Risk — Management Policy. TAC emissions from stationary sources are limited by: • SJVAPCD adoption and enforcement of rules aimed at specific types of sources known to emit high levels of TACs; • Implementation of the Air Toxics Hot Spots Program; and • Implementation of the Federal Title III Toxics program. Mobile Source Controls — The approach to regulation of TACs from mobile sources has been through establishment(by U.S. EPA and CARB)of emissions standards for motor vehicles (imposed on vehicle manufacturers) and through specifications for gasoline and diesel fuel sold in California(imposed I Further information on current regulations that apply to heavy-duty trucks and onsite nonroad equipment,can be — found at<www.dieselnet.com/>. RMC Pacific Vernalis Quarry Mining and Reclamation Prolect 4.6-10 ESA/203015 Draft Environmental Impact Report May 2006