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Overall, the modified project would include less building space and other beneficial design changes compared to the approved project. The similar land use intensity and area of site disturbance indicates that potential environmental impacts from the modified project would be similar to or less than those of the approved project. Project Mitigation Measures The Mitigated Negative Declaration identified mitigation measures to address air quality and traffic impacts from the approved project. While the modified project's beneficial changes noted in the table above would reduce the intensity of some of the project's potential environmental impacts, the mitigation measures in the Mitigated Negative Declaration would still be applicable to the modified project. Each mitigation measure and its applicability to the modified project is discussed below. Air Quality Mitigation Measure 1 a. During construction, the following dust and exhaust control measures shall be followed: 1. All exposed surfaces (e.g., parking areas, staging areas, soil piles, graded areas, and unpaved access roads) shall be watered two times per day. 2. All haul trucks transporting soil, sand, or other loose material off-site shall be covered. 3. 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 sweeping is prohibited. 4. All vehicle speeds on unpaved roads shall be limited to 15 mph. 5. All roadways, driveways, and sidewalks to be paved shall be completed as soon as possible. Building pads shall be laid as soon as possible after grading unless seeding or soil binders are used. 6. Idling times shall be minimized either by shutting equipment off when not in use or reducing the maximum idling time to 5 minutes (as required by the California airborne toxics control measure Title 13, Section 2485 of California Code of Regulations [CCR]). Clear signage shall be provided for construction workers at all access points. 7. All construction equipment shall be maintained and properly tuned in accordance with manufacturer's specifications. All equipment shall be checked by a certified mechanic and determined to be running in proper condition prior to operation. 8. Post a publicly visible sign with the telephone number and person to contact at the Lead Agency regarding dust complaints. This person shall respond and take corrective action within 48 hours. The Air District's phone number shall also be visible to ensure compliance with applicable regulations. Similar to the approved project, the modified project would result in construction-related emissions from heavy-duty construction equipment, trucks, worker vehicle emissions, and fugitive dust emissions. The air quality assessment prepared for the approved project determined that construction-related emissions would not exceed Bay Area Air Quality Management District's (BAAQMD's) significance thresholds for reactive organic gasses (ROG), nitrogen oxides (NOx), particulate matter-fine (PM2.5), and particulate matter (PM10) and would be considered a less-than-significant impact, but indicated that nearby receptors could be significantly affected by dust generated during construction activities unless the above-noted mitigation measure is implemented. The construction-related emissions for the modified project would be similar to the approved project because the area subject to ground disturbance would be similar. Therefore, the 3