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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 tractors/loaders/backhoe 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 TrenchinLy / Foundation <br />Pollutant Unmitigated <br />(lbs/day) Mitigated <br />(lbs/day) SCAQMD <br />Threshold <br />ROG 1.98 1.98 75 <br />NOx 16.48 16.48 100 <br />CO 9.05 9.05 550 <br />PM 10 0.83 0.83 150 <br />SO2 0.00 0.00 150 <br />PM 2.5 0.76 0.76 55 <br />CO2 1,839.01 1,839.01 N/A <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 URBEMIS 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 tractor/loader/backhoe, 2 aerial lifts, and I 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 />75B-122