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MacArthur Project Modification — Santa Ana - Air Quality Assessment <br />KPC Environmental, Inc. <br />5.1.2 Site Trenching/Foundation Emissions <br />Trenching /Foundation includes work on the site to prepare the site for utilities and <br />foundation/footing work to support the site structures. Trenching estimates in this <br />assessment are based on utilizing 4- pieces of heavy equipment including 2 excavators, 1 <br />other general industrial equipment, and 1 tractorslloaderslbackhoe over a period of <br />approximately 10 active work days. No mitigation measures were utilized in the <br />URBEMIS model for the emissions for this phase. <br />Table 5 -2 Trenching 1 Foundation <br />Pollutant <br />Unmitigated <br />(lbslday) <br />Mitigated <br />Obslday) <br />SCAQMD <br />Threshold <br />ROG <br />1.98 <br />1.98 <br />75 <br />NOx <br />15.48 <br />15.48 <br />100 <br />CO <br />9.05 <br />9.05 <br />550 <br />PM 10 <br />0.83 <br />0.83 <br />150 <br />S02 <br />0.00 <br />0.00 <br />150 <br />PM 2.5 <br />0.76 <br />0.76 <br />55 <br />Cot <br />13839.01 <br />1,839.01 <br />NIA <br />Bold - underline indicates exceedance of SCAQMD Threshold. <br />5.1.3 Building Construction Emissions <br />Construction proposed as part of this project will include the construction of 6 -level <br />parking structure with one subterranean level and 5 above ground levels for <br />approximately 140,000 square feet. The roof of the structure is proposed to be developed <br />for recreational uses including BBQ area, spa, pool, and picnic areas. Default conditions <br />were used in UR13EMIS to model potential emissions that would be associated with the <br />construction activities and the movement of materials and work crews to /from the site. <br />Building construction estimates were based on utilizing 6 pieces of equipment including: <br />2 forklifts, 1 tractorlloaderlbackhoe, 2 aerial lifts, and 1 crane over a period of <br />approximately 210 active working days. Equipment operating hours were estimated at 8- <br />hours per day for all equipment with the exception of the forklifts estimated at 6 -hours of <br />operation per day and the crane estimated at 4 -hours per day. The run hours present a <br />worst -case scenario as most equipment will not be continuously in operation for an entire <br />work shift. <br />02/02/11 14 <br />