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AUGUSTIN BERNAL MOUNTAIN BIKE TRAIL PROJECT DRAFT INITIAL STUDY parking.Therefore,the proposed project would not hinder implementation of 2017 Clean Air Plan control measures. In summary,the responses to all three of the questions with regard to Clean Air Plan consistency are affirmative and the proposed project would not conflict with or obstruct implementation of the 2017 Clean Air Plan.This is a less-than-significant impact. b) Would the project result in a cumulatively considerable net increase of any criteria pollutant for which the project region is non-attainment under an applicable federal or state ambient air quality standard? The California Emissions Estimator Model (CaIEEMod) Version 2020.4.0 was used to estimate emissions from the project's construction and operation.CaIEEMod is a statewide computer model developed in cooperation with air districts throughout the state to quantify criteria air pollutant and GHG emissions associated with construction and operational activities from a variety of land use projects, such as residential, commercial, recreational and industrial facilities. CaIEEMod input parameters, including the project land use type and size and construction schedule, were based on information provided by the City and default model assumptions if project specifics were unavailable. Construction. Construction of the project would involve the construction of the Augustin Bernal Mountain Bike Trail, an approximately 0.7-mile (3,700 linear feet) long, technical mountain bike trail, replacing an existing user-created trail,and decommissioning approximately 4,300 linear feet of other existing user-created trails.Construction activities and methodology would include clearing and grubbing of shrubs and groundcover vegetation and the trimming of tree branches that could impede the vertical clearance along the trail. Grading of the trail surface would be completed to create a trailbed, berms,turns,jumps,and other trail features as well as create grade reversals to provide for appropriate erosion and drainage control. Shallow ripping of soils within decommissioned areas would be conducted to reduce soil compaction. Construction activities are anticipated to occur continuously during daylight hours throughout a three-month period in late- spring/early-summer of 2022. Sources of construction emissions at the project site would include: off-road construction equipment exhaust and fugitive dust associated with site preparation and grading activities. Detailed assumptions associated with project construction are included in Appendix B,Air Quality Modeling Results. Average daily emissions were computed by dividingthe total construction emissions by the number of active construction days,which were then compared to the BAAQMD construction thresholds of significance. Table 3.3-2 shows average daily construction emissions of 03 precursors (ROG and NOx), PM10 exhaust,and PM2.5 exhaust during project construction. 12956 DUDEK 23 April 2022