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4.6 Air Quality r TABLE 4.6-4 r CONSTRUCTION ENGINE EMISSIONS ESTIMATES(TONS PER YEAR) Construction Emissions'"2 r Significance Pollutant Threshold 5-Year-Old Equipment' New Equipment' _ ROG 10 0 0 NO. 10 7 3 CO NA4 2 2 r PMro NA" 0 0 ' This estimate of the entire project assumes 74 days of construction,8 hours per day.Equipment would include 6 scrapers,2 dozers,1 motor grader and 2 water trucks.It assumes that total construction would be 800,000 cubic yards of topsoil.See Appendix D of the Draft EIR for further details.The r estimate considered construction for 659 acres. 2 This estimates show the emissions if all of the topsoil from the project would be graded in one year. The most grading that could be expected in any year would be two phases,which would be no more than 25 percent of the total emissions shown in these analyses. Five-year-old equipment is 2002 model year.New equipment is 2007 model year. 4 SJVAPCD does not have a significance threshold for CO and PM,o.PM10 mitigations are described in detail in Mitigation Measure 4.6.1.CO concentrations are analyzed in Impact 4.6.5. r Mitigation Measures Measure 4.6.1: The project applicant shall comply with SJVAPCD's Regulation VIII control measures and shall retain an on-site air quality monitor to ensure compliance with the SJVAPCD's Regulation VIII control measures. The monitor must be familiar with the SJVAPCD Regulation VIII Fugitive PMio Prohibitions, including implementation of all feasible control measures specified in the SJVAPCD's Guide for Assessing Air Quality ` Impacts. Impact Significance After Mitigation: With implementation of the above mitigation r measures in compliance with Regulation VIII,the project construction impacts would be less than significant. Impact 4.6.2: Project Operational-Phase Emissions Impact. The proposed surface mining of topsoil,sand and gravel would take place on approximately 659 acres within the Project Site,consisting of the extraction and processing of 1.7 to 4.0 million tons per year of aggregate materials over a 26 to 60 year period. The impacts of operational air quality emissions of criteria pollutants are significant. r Emissions from operations would include the processing facility,Ready Mix Concrete Plant, Asphalt Plant and a concrete recycling plant.The processing facility would consist of conveyors, r screens,crushers, scrubbers, and stockpiles. There would be a Ready Mix Concrete Plant and an Asphalt Plant. A portable,concrete recycling plant, owned and operated by an outside contractor, ` would intermittently be placed in the middle of the plant site to produce base material.The Ready Mix Concrete Plant, with an estimated production of 350,000 cubic yards per year, would include RMC Pacific Vernalis Quarry Mining and Reclamation Project 4.6-2 ESA t 203015 Draft Environmental Impact Report May 2006