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San Joaquin County Community Environmental Setting, Impacts,and Mitigation Measures ' Development Department Air Quality w Building Area Source. Area emissions associated with the plant buildings were estimated using the URBEMIS2002 (Version 8.7)model, with the assumption there would be a total of 10,000 square feet of general heavy industry buildings present on site. URBEMIS2002 is a computer program used to estimate emissions from construction,vehicle trips, and fuel use resulting from land use development projects. URBENUS2002 estimates emissions based on the type of land use and area source and vehicular emissions typically associated with the land use. y' Overburden Removal/Mining Activities. Emissions associated with overburden removal and mining activities were estimated using URBEMIS2002. It was anticipated that one rubber tired dozer and two scrapers would operate 10 .. hours per day,five days a week for the 2007 scenario and one rubber tired dozer and two scrapers would operate 14 hours per day,five days a week for the 2027 scenario. To represent the most likely average daily production, it was assumed �. that 500,000 tons per year(2,000 tons per day)would be processed under the 2007 scenario,while 750,000 tons per year(6,000 tons per day)would be processed under the 2027 scenario. Stockpiling Activities. Emissions associated with the placement of mined materials to the stockpile areas were estimated using URBEMIS2002. It was Lanticipated that one rubber tired dozer and two scrapers would operate 10 hours per day, five days a week for the 2007 scenario,while one rubber tired dozer and two scrapers would operate 14 hours per day, five days a week for the 2027 scenario. It was assumed that all materials excavated daily would be stockpiled •' before transport for processing. Stockpile to Plant Facility Hauling. Once materials have been stockpiled,they would be hauled to the processing plant for near-term scenario(2007),but long- term operation plans are to use electric conveyors to transport materials. Emissions associated with hauling stockpiled materials to the plant for the 2007 r, scenario were estimated using the ARB's EMFAC2002 (Version 2.2) emission rate program and URBEMIS2002. Information provided by the Applicant indicates that there will be 67 heavy-duty haul truck trips daily at 7,800 feet per L, trip to haul materials from the stockpile to plant. Aggregate Processing. It was assumed the aggregate processing plant would �. have a baghouse (fabric filter), and PM 10 represented approximately 47% of the total PM associated with aggregate processing. Information provided by the project applicant indicates that 2,000 tons would be produced daily for the 2007 scenario and 6,000 tons daily for the 2027 scenario. The uncontrolled daily emissions from this process would exceed the BACT threshold. The SJVAPCD has BACT guidelines that require a BACT determination to be made as part of the permitting process. The BACT clearinghouse lists a prior BACT L determination for this process. However, as technology improves, BACT determinations are updated and the latest technology will need to be implemented for this process. i DeSilva Gates Quarry Project Draft Environmental Impact Report 3.0-11 JSS 05105.05 L