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San Joaquin County Community Air Quality Technical Infonnalion <br /> Development Department <br /> assumed to be the same as those for the current year. Actual 1- and 8-hour <br /> background concentrations in future years would likely be lower than those used <br /> in the CO modeling analysis because the trend in CO emissions and <br /> concentrations is decreasing because of continuing improvements in engine <br /> technology and the retirement of older,higher-emitting vehicles. _ <br /> References Cited <br /> Benson,P. E. 1989. CALINE4---a dispersion model for predicting air pollution <br /> concentrations near roadways. California Department of Transportation. <br /> Sacramento,CA. <br /> California Department of Transportation. 1988. Air Quality Technical Analysis <br /> Notes. Sacramento,CA. <br /> Highway Research Board. 1965. Highway Capacity Manual. Washington,D.C. <br /> U.S. Environmental Protection Agency. 2005. Air Data. Last Revised: October <br /> 3,2005. Available: <http://www.epa.gov/air/data/reports.html>. Accessed: <br /> November 1, 2005. <br /> ti <br /> DeSilva Gates Quarry Project �- <br /> Draft Environmental Impact Report J_4 <br /> As 05105.05 <br />