SU0014565 (2) - Laserfiche WebLink

Home Browse Search

Tables 2 and 3 of Appendix 13.4 are compilations of detailed quantitative data for San Joaquin and Stanislaus Counties for the five year period of 1981 to 1985. These tables can be summarized by stating that ozone is currently the air pollutant that is hardest to control within State and Federal standards. Particulates (TSP) are also a continuing problem in San Joaquin County. IMPACTS Construction Impacts. Earthmoving, hauling and trenching activities would result in localized and temporary increases in the levels of total suspended particulates (TSP). The significance of construction related particulate emissions is determined not only by particulate (dust) emissions but also by the proximity to sensitive receptors. There are a number of residences within .5 miles of the site and the Jefferson School is within .5 miles of the site. Lona Term Impacts. Table 3.6-2 shows maximum emissions generated by all the auto trips in a year. Emissions are shown for the 14 units in the proposed project and the 219 units that would result from a buildout of the entire section. Calculations from the traffic section indicate that the average trip length will be approximately 20 miles. One way distances used for the calculations are 35 miles for Bay Area trips, 5 miles for trips to Tracy and 20 miles for trips to Interstate 5 via Eleventh Street and Kasson Road. Emission factors used are based on emission parameters developed by California Air Resources Board (May, 1985). The 1990 emission year is used with an average speed of 35 mph (considering the Level of Service to be A). The air pollution emitted is directly proportional to the number of units. The maximum potential buildout of this area (219 units) will cause about 15 times the auto pollution of the proposed 14 lot subdivision. The maximum of 219 units would emit less than 0.4 percent of the projected 1987 emissions of CO (167.32 tons/day) for San Joaquin County (San Joaquin County 1982 Air Quality Management Plan). The increased traffic created by the proposed project would have the most direct effect upon air quality. Winter use of fireplaces would also be a source of air pollutants. Although both automobiles and fireplaces emit CO as the major pollutant, the rural nature of this project eliminates the possibility of CO being a significant impact. MITIGATION MEASURES. Mitigation measures similar to the ones in Table 4 of Appendix 13.4 should be followed if dust control problems develop during the construction phase of the project (or can be expected to develop due to construction plans or meteorological patterns. The most viable way to reduce the projected vehicle emissions is to reduce the average daily miles traveled. Carpooling and vanpooling will have some appeal in the project area because of the long distances involved in commuting trips to the Bay Area. Whereas carpooling would have only a minimal beneficial impact on the 14 unit project, the beneficial impact of carpooling and van - pooling could be considerable and should be promoted in the maximum buildout scenario. 3.6-3