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` ' t 1 LSA ASSOCIATES,INC. INITIAL STUDY/ENVIRONMENTAL DOCUMENTATION JULY 2000 STOCKTON METRO POLI TAN AIRPORT SPECIAL PURPOSE PLAN The traffic analysis was revised(June 2000)to address all development areas, resulting in an overall reduction in average daily vehicles. The revised project trip generation estimates from Rajappan & Meyer show that total daily trips from the project development areas F (Airport East, Air Metro Park,and Airport West) are reduced by 20 percent(from 76,651 to 61,860) from the previous projections(Airport East and Air Metro Park). This reduction in total vehicular trips would represent a decrease of approximately 20 percent in total air F pollutant emissions from the project sites. The revised total project trips(61,860)for the Airport East development area is only two percent higher than the total trips(60,716)from the previous projections. There will be no measurable changes in either the total vehicular emissions from the project nor the local CO concentrations at affected intersections. FWould the project: Ft a) Conflict with or obstruct implementation of the applicable air quality plan? No impact. The proposed project is consistent with the Air Quality Attainment Plan prepared by the San Joaquin Valley Unified Air Pollution Control District (SJUVAPCD) as it includes land uses that were similar to those adopted in the Master Plan which is now included in the County's General Plan. b) Violate any air quality standard or contribute substantially to an existing or projected air quality violation? Potentially significant unless mitigated. Project implementation will have an effect t an air quality both during construction and over the long-term. During construction, ` depending on the size of the area being graded,temporary threshold exceedances for criteria pollutants could occur, both from the project and from cumulative construction activity. Impacts can be reduced to levels less than significant by controlling the size of development at a given time and by implementing the measures from the Master Plan EIR document dealing primarily with fugitive dust Fcontrol (SJUVAPCD Regulation VIII). These measures are repeated below: Airport Master Plan Mitigation: Mitigation Measure AQ-1: Implement the measures in the San Joaquin Valley F Unified Air Pollution Control District's Regulation VIII. Mitigation Measures F Air-1 SJVUAPCD Regulation VIII Control Measures for Construction Emissions sslons of PMIo, are required to be implemented at all construction sites. (A) All disturbed areas, including storage piles,which are not being actively utilized for construction purposes, shall be effectively stabilized of dust emissions using water,chemical stabilizer/suppressant, or vegetative ground cover. (B) All on-site unpaved roads and off-site unpaved access roads shall be F! effectively stabilized of dust emissions using water or chemical stabilizer/suppressant. F 7/20/00(P:\SJC0301EnvironmentaiNinitial study.wpd) F! 28