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III. ENVIRONMENTAL SETTING,IMPACTS AND MITIGATION MEASURES B. AIR QUALITY Impact B.2: The project would result in an increase of emissions of criteria air pollutants from on-road motor vehicle traffic traveling to and from the project site and operation of off-road diesel-powered equipment on the project site. The increase in emissions could exceed SJVUAPCD significance criteria for ROG and NO%.(Less than Significant). The project would result in criteria air pollutant emissions from on-site equipment operation and project-generated trips to and from the site, including employee and collection trips. The project applicant anticipates that at the completion of project construction in 2000, operations would be at roughly 60 percent of the full permitted capacity. For the purposes of this analysis,it is assumed that the project would operate at full capacity as of 2003. The number of daily vehicle trips generated by the project was estimated in Section III.C,Traffic Circulation and Safety. At buildout, the project would generate roughly 804 daily vehicle trips of which 544 trips would be considered new trips. These trips would be distributed over the local roadway network. The following diesel-powered equipment would be operated at the project site: • Tub Grinder(600 horsepower [hp]) • Caterpillar 950 Bucket Loader(180 hp) • Caterpillar 906 Bucket Loader-(60 hp) • Back-up Loader-Caterpillar 950(180 hp) • Excavator(55 hp) • Flat Screen (Screen All) (34 hp) • Forklift(61 hp) • Roll-off Truck(240 hp) As described earlier in this section,the SJVUAPCD's GAMAQI indicates that ozone precursor emissions from a project should not exceed 10 tons per year of ROG or NOX. Projects that emit 'ozone precursors in excess of these levels are considered to have a significant air quality impact. The District's GAMAQI provides guidance on the level of detail necessary to complete air quality analyses for various types of projects,including industrial projects such as the proposed transfer station expansion, based on the size and type of project. The SJVUAPCD has pre-determined the size below which many commonly encountered projects will not exceed significance thresholds for ROG and NOX that provides an adequate margin to account for site-specific differences. For industrial projects, the threshold for requiring a detailed quantitative analysis are those projects that would generate 1,501 vehicle trips or more per day. The SJVUAPCD suggests that for projects generating trips equal to or below this threshold,no quantification of ozone precursor emissions is needed on the basis that there is no possibility of exceeding the emissions District's threshold of 10 tons per year for ROG and NOX. These types of projects fall under those requiring a Small Project Analysis Level(SPAL)of detail. For industrial projects falling into the SPAL category, the District recommends focusing on other potential air quality impacts (e.g., odors and toxic air contaminants). Because the total number of project-generated trips falls well below the 1,501 vehicle trip threshold requiring detailed analysis,the project would not generate ozone precursor emissions that exceed District thresholds. For these reasons, this would be a less-than-significant impact. Stockton Scavenger Transfer Station Expansion III.B.13 ESA/990190