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4. ENVIRONMENTAL ANALYSIS 4.6 AIR QUALMY ` hundred feet of the site and could result in nuisance-type impacts. Combustion emissions from heavy equipment and construction worker commute trips would also vary from day to day,and would contribute incrementally to regional ozone concentrations over the roughly two-year .. construction period. However,since these emissions are temporary and intermittent,their long- term effects on chronic health impacts would be small,as compared to the standard of 70 year exposure to these toxic substances. Therefore,the impacts of diesel construction emissions are less-than-significant. Construction emissions have not been quantified because preparing estimates is not required by the Valley Air District. The Valley Air District requires implementation of effective and _ comprehensive control measures rather than detailed quantification of emissions. Implementation of feasible control measures can be reasonably expected to reduce PM10 emissions during ~ construction. The Valley Air District has determined that compliance with its Regulation VIII constitutes sufficient mitigation to minimize adverse construction-related air quality impacts. The following control measures are required under Regulation VIII: • All disturbed areas,including storage piles that are not being actively used for construction purposes shall be effectively stabilized using water,chemical stabilizer/suppressant, or vegetative cover. • All onsite unpaved roads and off-site unpaved access roads shall be effectively stabilized ` using water or chemical stabilizers/suppressants. • All land-clearing grubbing, scraping,excavation,land leveling, grading, cut and fill, and demolition activities shall be effectively controlled using water or by presoaking to control dust emissions. • When materials are transported off site, all material shall either be covered or wetted to 4 limit visible dust emissions. Alternatively, the applicant or the applicant's contractor shall maintain at lease six inches of freeboard space from the top of the container to the material. • All operations shall limit or expeditiously remove the accumulation of mud or dirt from ` adjacent public streets at least once every 24 hours when operations are occurring. (The use of dry rotary brushes is expressly prohibited except where preceded or accompanied by sufficient wetting to limit the visible dust emissions. Use of blower devices is expressly forbidden.) • Following the addition of materials to, or the removal of materials from,the surface of ` outdoor storage piles;piles shall be effectively stabilized from creating fugitive dust emissions using water or chemical stabilizer/suppressant. • Within urban areas,trackout shall be immediately removed when it extends 50 or more feet from the site and at the end of each workday. • Any site with 150 or more vehicle trips per day shall prevent carryout and trackout. • The Proposed Project shall retain an onsite air quality monitor during periods of construction-related activity to ensure compliance with the Valley Air District's Regulation ` VIII control measures. The monitor must be familiar with the Valley Air District's RMC Pacific Vemalis Quarry Mining and Reclamation Pmject 4.6-19 ASA 1203015 Adndwsmtwe Draft ER2 Minch 2004