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n�^�IVED - San Joaquin Valley JAN 2 8 Air Pollution Control District 2003 - Commwiy vevelopment Dept, Leanne Mueller January 23,2003 San Joaquin County Community Development Department Development Services Division 1810 East Hazelton Avenue Stockton, CA 95205 SUBJECT: NOTICE OF PREPARATION FOR THE ENVIRONMENTAL IMPACT REPORT FOR RMC PACIFIC MATERIALS- QUARRY EXCAVATION Dear Ms Mueller: The San Joaquin Valley Unified Air Pollution Control District (District) has reviewed the proposed project and offers the following comments: The San Joaquin Valley's air quality has been designated nonattainment by the EPA and by the Air Resources Board (ARB) for ozone and fine particulate matter(PM-10). The Federal Clean Air Act (CAA) and the California Clean Air Act require areas that are designated nonattainment to reduce emissions until standards are met. The District recommends that the air quality section of the EIR have three main components. Section one should provide a description of the regulatory environment and existing air 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, 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. David L. Crow Executive Director/Air Pollution Control Officer — Northern Region Office Central Region Office Southern Region Office 4230 Kiernan Avenue, Suite 130 1990 East Gettysburg Avenue 2700 M Street, Suite 275 Modesto, CA 95356.9322 Fresno, CA 93726.0244 Bakersfield, CA 93301-2373 (209) 557-6400 • FAX (209) 557-6475 (559) 230-6000 • FAX (559) 230-6061 (661)326-6900 • FAX (661) 326.6985 www.va)feyafrorg