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Responses to Environmental Checklist For CEQA Compliance Using the dust emissions factor developed by EPA for grading activities, the PM,a fraction of fugitive dust emissions are predicted to be around 55 pounds per day per acre disturbed in the absence of any dust control measures being applied (SCAQMD Handbook, Table 9-2}, Mandatory measures required by South Coast AQMD Rule 403 (Fugitive Dust) are generally assumed to reduce this rate by approximately 50%. Average daily PM,o emissions during site grading and other disturbance are stated 9n the SCAQMD Handbook to be 26.4 pounds/acre. According to the California Air Resources Board (ARB}, PM2.~ is normally considered to comprise up to 40% of PM~o in urban areas, such as the proposed Project area. These estimates are based upon required dust control measures in effect in 1993 when the AQMD CEQA Air Quality Handbook was prepared. Rule 403 was subsequently revised to require use of a greater array of fugitive dust con#rol on construction projects. Use of enhanced dust control procedures such as continual soil wetting, use of supplemental binders, early paving, etc. can achieve substantially higher dust contra) efficiency. PM-10 emissions were calculated by assuming that construction activities would comprise approximately 0.1 acre for the proposed lift station, an additional 0.1 acre for demolition of the existing lift station, and an additional 0.05 acre of disturbance associated with the construction of new sewer pipelines. Thus, the total area estimated for disturbance would be approximately 0.25 acre. Assuming the entire impact area is under simultaneous heavy construction, construction of the proposed project could result in emissions of up to 6.60 pounds of PM~o and up to 2.64 pounds of PM2,5 per day. As shown in Table 2, these values are far below the significance thresholds established by the SCAQMD for these criteria pollutants, and construction emissions associated with PM~o andlor PM2.5 would not be significant. Equipment Exhaust Construction equipment entails the use of internal diesel-powered combustion engines which are not regulated in terms of allowable emission levels. Equipment exhaust would be released during project construction activities from mobile sources. Diesel-powered construction equipment would create gaseous and particulate tailpipe emissions that are not regulated by smog control rules such as for on-road sources. Emissions associated with diesel-powered construction equipment (backhoes, cement trucks, portable compressors, etc.) and associated with vehicles used by workers commuting to the job site would occur. Assuming an average amount of energy expenditure of 4,000 brake- horsepower hours per day, the daily pollutant emissions from equipment exhaust would be as follows, which are below significance thresholds: Reactive Organic Gases (ROG) -11.0 Carbon Monoxide {CO) - 125.0 Nitrogen Oxides (NOx) - 50.0 Sulfur Dioxide (SOx) - 2.5 These emission levels are small and the mobile nature of construction equipment is such that no single receptor would be exposed to equipment emissions for any Page 3& of 64 75E-40