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ELndiw o Under existing traffic conditions, with relatively short delays at major intersections, there are some violations of state and federal standards for CO levels. Under GP buildout, there is apotentialforWolationsofstandardsforCO concentrations. These speck conclusions are based on computer modeling estimates and have not been verified with field air quality samples. Monitoring data for San Joaquin County indicate that violations have occurred recently. o Lower re year emission rates due to motor vehicle emission control devices may offset higher tra,,f'ic levels. o An Inspection and Maintenance a&M) program would result in substantially lower emissions per vehicle for micro-scale and regional emissions. An I&M program has been requested by the County of San Joaquin and would be operated by the Bureau of Automotive Repair through the Department of Motor Vehicles registration material. It is interesting to note that Table 13-4 quoted the worst air quality is predicted to be significantly west of Highway 99 (19-22 ppm) and that CO values near Highway 99 are in the 8-9 ppm range. Impar The air quality impacts were determined for three scenarios 1 the existing conditions g co d tions are the transfer station, 2) the proposed expansion of the transfer station handling five times the current waste stream, and 3) the alternative of no expansion of the transfer station but with the transfer station achieving the 50% recycling goal, as required by AB 939. For the last scenario all recycling activities not occurring at the transfer station are assumed to take place at the disposal sites. In addition to the vehicular emission impacts, air quality impacts from the on-site equipment is evaluated for the three scenarios. It should be mentioned that no measurements of on-site vehicular emissions were conducted to determine the pollution estimates shown in this report. The values used in this study were based on both the AQAT-3 computer program and a report entitled "Air Quality and Urban Development Guidelines for Assessing Impacts of Projects and Plans" by Bay Area Air Quality Management District, 1985. These data sources may overestimate actual vehicular emissions by at least 50%. Computer printouts for all the following calculations are found in Appendix F of this document. Existing Conditions To determine the future impacts of the proposed project is it necessary to estimate the existing emissions at the transfer station for purposes of comparison. For this estimate a waste stream of 650 tons per day (TPD) is assumed, divided into 130 TPD of waste recycled at the station and 520 TPD hauled back to the landfills. 19