CEQA Air Quality Handbook - Air Pollution Control District

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SLO County APCD CEQA Air Quality Handbook 2012 Table 2-1: Thresholds of Significance for Construction Operations Pollutant Daily Threshold (1) Quarterly Tier 1 Quarterly Tier 2 ROG + NO x (combined) 137 lbs 2.5 tons 6.3 tons Diesel Particulate Matter (DPM) 7 lbs 0.13 tons 0.32 tons Fugitive Particulate Matter (PM 10 ), Dust (2) Greenhouse Gases (CO 2 , CH 4, N20, HFC, CFC, F6S) 2.5 tons Amortized and Combined with Operational Emissions (See Below) 1. Daily and quarterly emission thresholds are based on the California Health & Safety Code and the CARB Carl Moyer Guidelines. 2. Any project with a grading area greater than 4.0 acres of worked area can exceed the 2.5 ton PM 10 quarterly threshold. Mitigation of construction activities is required when the emission thresholds are equaled or exceeded by fugitive and/or combustion emissions: ROG and NOx Emissions • Daily: For construction projects expected to be completed in less than one quarter (90 days), exceedance of the 137 lb/day threshold requires Standard Mitigation Measures; • Quarterly – Tier 1: For construction projects lasting more than one quarter, exceedance of the 2.5 ton/qtr threshold requires Standard Mitigation Measures and Best Available Control Technology (BACT) for construction equipment. If implementation of the Standard Mitigation and BACT measures cannot bring the project below the threshold, off-site mitigation may be necessary; and, • Quarterly – Tier 2: For construction projects lasting more than one quarter, exceedance of the 6.3 ton/qtr threshold requires Standard Mitigation Measures, BACT, implementation of a Construction Activity Management Plan (CAMP), and off-site mitigation. Diesel Particulate Matter (DPM) Emissions • Daily: For construction projects expected to be completed in less than one quarter, exceedance of the 7 lb/day threshold requires Standard Mitigation Measures; • Quarterly - Tier 1: For construction projects lasting more than one quarter, exceedance of the 0.13 tons/quarter threshold requires Standard Mitigation Measures, BACT for construction equipment; and, • Quarterly - Tier 2: For construction projects lasting more than one quarter, exceedance of the 0.32 ton/qtr threshold requires Standard Mitigation Measures, BACT, implementation of a CAMP, and off-site mitigation. Fugitive Particulate Matter (PM10), Dust Emissions • Quarterly: Exceedance of the 2.5 ton/qtr threshold requires Fugitive PM 10 Mitigation Measures and may require the implementation of a CAMP. Greenhouse Gas Emissions • GHGs from construction projects must be quantified and amortized over the life of the project. The amortized construction emissions must be added to the annual average operational emissions and then compared to the operational thresholds in Section 3.5.1—Significance Thresholds for Project-Level Operational Emissions. To amortize the emissions over the life of the project, calculate the total greenhouse gas emissions for the construction activities, divide it by the project life (i.e., 50 years for residential projects and 25 years for commercial projects) then add that number to the annual operational phase GHG emissions. 2-2
SLO County APCD CEQA Air Quality Handbook 2012 2.1.1 Special Conditions for Construction Activity In addition to the construction air quality thresholds defined above, there are a number of special conditions, local regulations or state / federal rules that apply to construction activities. These conditions must be addressed in proposed construction activity. Sensitive Receptors The proximity of sensitive individuals (receptors) to a construction site constitutes a special condition and may require a more comprehensive evaluation of toxic diesel PM impacts and if deemed necessary by the SLO County APCD, more aggressive implementation of mitigation measures than described below in the diesel idling section. Areas were sensitive receptors are most likely to spend time include schools, parks and playgrounds, day care centers, nursing homes, hospitals, and residential dwelling unit(s). Sensitive receptor locations for a project need to be identified during the CEQA review process and mitigation to minimize toxic diesel PM impacts need to be defined. The types of construction projects that typically require a more comprehensive evaluation include large-scale, long-term projects that occur within 1,000 feet of a sensitive receptor location(s). Diesel Idling Restrictions for Construction Phases The APCD recognizes the public health risk reductions that can be realized by idle limitations for both on and off-road equipment. The following idle restricting measures are required for the construction phase of projects: a. Idling Restrictions Near Sensitive Receptors for Both On and off-Road Equipment 1. Staging and queuing areas shall not be located within 1,000 feet of sensitive receptors; 2. Diesel idling within 1,000 feet of sensitive receptors is not permitted; 3. Use of alternative fueled equipment is recommended whenever possible; and, 4. Signs that specify the no idling requirements must be posted and enforced at the construction site. b. Idling Restrictions for On-road Vehicles Section 2485 of Title 13, the California Code of Regulations limits diesel-fueled commercial motor vehicles that operate in the State of California with gross vehicular weight ratings of greater than 10,000 pounds and licensed for operation on highways. It applies to California and non-California based vehicles. In general, the regulation specifies that drivers of said vehicles: 1. Shall not idle the vehicle’s primary diesel engine for greater than 5 minutes at any location, except as noted in Subsection (d) of the regulation; and, 2. Shall not operate a diesel-fueled auxiliary power system (APS) to power a heater, air conditioner, or any ancillary equipment on that vehicle during sleeping or resting in a sleeper berth for greater than 5.0 minutes at any location when within 100 feet of a restricted area, except as noted in Subsection (d) of the regulation. Signs must be posted in the designated queuing areas and job sites to remind drivers of the 5 minute idling limit. The specific requirements and exceptions in the regulation can be reviewed at the following web site: www.arb.ca.gov/msprog/truck-idling/2485.pdf. c. Idling Restrictions for off-Road Equipment Off-road diesel equipment shall comply with the 5 minute idling restriction identified in Section 2449(d)(3) of the California Air Resources Board’s In-Use off-Road Diesel regulation: www.arb.ca.gov/regact/2007/ordiesl07/frooal.pdf. Signs shall be posted in the designated queuing areas and job sites to remind off-road equipment operators of the 5 minute idling limit. 2-3
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CEQA Air Quality Handbook - Air Pollution Control District

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