Reso PC15-01 PC Reso (3051 ) to Adopt Initial Study-Mitigated Negative Declaration - La Palma

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3.0 Environmental Impact Checklist proposed project),emissions would be less than the greenfield type project on which these screening criteria are based (BAAQMD 2011). The 2010 screening criteria for construction include: 1. The project is below the applicable screening level size(less than 114 dwelling units). 2. All Basic Construction Mitigation Measures would be included in the project design and implemented during construction. 3. Construction-related activities would not include any of the following: a. Demolition activities inconsistent with District Regulation 11, Rule 2:Asbestos Demolition, Renovation and Manufacturing; b. Simultaneous occurrence of more than two construction phases(e.g.,paving and building construction would occur simultaneously); c. Simultaneous construction of more than one land use type(e.g.,project would develop residential and commercial uses on the same site) (not applicable to high density infill development); d. Extensive site preparation(i.e., greater than default assumptions used by the Urban Land Use Emissions Model [URBEMISI for grading, cut/fill, or earth movement);or e. Extensive material transport(e.g., greater than 10,000 cubic yards of soil import/export)requiring a considerable amount of haul truck activity. The screening criteria for determining if operations-related impacts are less than significant require that a project is less than 325 dwelling units and the project only has emissions sources that are included in the default assumption of the URBEMIS program (e.g.,standard construction equipment and methods). Construction The project, at 12 dwelling units, is considerably under the screening criteria size of 114 dwelling units. The project site is 1.07 acres and would therefore not include extensive material transport or extensive site preparation. Only one land-use type—single-family homes—is proposed on the project site. To ensure that paving and building construction did not occur at the same time, and to ensure that any existing buildings are demolished in accordance with District Regulation 11,Rule 2, regarding asbestos, the following mitigation measures would be implemented,in addition to the basic construction measures identified by BAAQMD. With implementation of these measures,the project construction would have a less than significant impact on air quality. Mitigation Measure AIR-1:The following basic measures shall be implemented during all project construction activities. All exposed surfaces(e.g.,parking areas, staging areas, soil piles, graded areas, and unpaved areas) shall be watered two times per day. • All haul trucks transporting soil, sand, and other loose material off-site shall be covered. O All visible mud or dirt track-out onto adjacent public roads shall be removed using wet power vacuum street sweepers at least once per day. The use of dry power sweepers is prohibited. • All vehicle speeds on unpaved roads shall be limited to 15 miles per hour. La Palma Subdivision Project Final Initial Study/Mitigated Negative Declaration 24