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NOV-20-2003 THU 10:24 AM cANJOAQ VALLEY AIR DIST FAX NO. 20AW6475 P, 03 San Joaquin County November 19, 2003 PA-0300573 (GP) Page 2 quality conditions impacting the San Joaquin Valley. Section two should provide estimates of existing emissions and projected pollutant emissions related to any increases in population, vehicle use, and construction activities along with an analysis of the effects of these increases. Section three should identify and discuss all feasible mitigation measures which, after implementation, will reduce the air quality impacts generated by this project. If the emissions from this project have been addressed in previous environmental documentations please provide that information, so that the District can make appropriate comments. Section 1: description of the regulatory environment and existing air quality conditions of the San Joaquin Valley. The District has several sources of information available to assist with the existing air quality and regulatory environment section of the EIR. The District's Guide for Assessing and Mitigating Air Quality Impacts (GAMAQI) contains discussions regarding the existing air quality conditions and trends of the San Joaquin Valley Air Basin, including those pollutants of particular concern: ozone, PM-10, and carbon monoxide_ In addition, it provides an overview of the regulatory environment governing air quality at the federal, state, and regional levels. The GAMAQI provides air monitoring data and other relevant information for PM-10 and other pollutants. Section 2: projected pollutant emissions generated during the construction and operational phases of the project. The growth-inducing and cumulative impacts analyses should take into consideration the existing and planned development both within the project area and in the surrounding areas. The District recommends the use of the URBEMIS 2002 modeling program to calculate the pollutant emissions resulting from motor vehicle trips generated by this development project. Additional guidance is provided in the GAMAQI. Additionally, the EIR should quantify emissions that are individually small but cumulatively significant sources of pollution. This includes, but is not limited to, emissions from natural gas combustion for space and water heating and emissions from gas-powered lawn and garden maintenance equipment. URBEMIS 2002 may also be used to quantify these emissions. As the projects are considered for approval the applicant and San Joaquin County should consider the toxic risk associated with diesel-fueled engines and vehicles. The California Air Resources Board has issued a report entitled Risk Reduction Plan to Reduce Particulate Matter Emissions from Diesel-Fueled Engines and Vehicles (October 2000). Appendix VIi of the report provides several risk characterization scenarios, which may serve as a starting point for estimating asks from diesel engine X,