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` The reasonably foreseeable maximum production rate should have been calculated from the resource size, equipment capacity, and reasonable worst-case operating scenario. The emissions from other portions of the facility were based on operating 8 hours per day for 261 days per year. Thus, assuming the quarry operates on the same schedule at its design capacity of 8,000 ton/hour, the maximum annual B-36 tonnage would be 16.7 million tons per year or four times more than disclosed in the cont. Draft EIR. The Excel spreadsheets assume an in-place density for aggregate of 8 ton/yd3 33 Thus, the in-place resource, amounting to 92,746,693 cubic yards (Draft EIR, Table 3-1),would last 44 years, well within the 26 to 60 year life stated in the Draft EIR, page 3-8. The revised PM10 emissions are shown in Table A-2. These two errors reduced PM10 emissions from quarry processing from 224.8 ton/year (Exhibit 1) to ,.. 117.4 ton/year (Table A-2). IV.D.5 Pit Feeders r. The Excel spreadsheets in Exhibit 1 indicate that the quarry processing rate is 6. 8,000 ton/hour. The equipment list indicates one pit feeder with a process rate of 2,000 ton/hour, but four pit conveyors rated at 2,000 ton/hour each. Thus, to B37 achieve the stated quarry processing rate, four pits would be required. Thus, the V Draft EIR has erred and assumed only one pit feeder rather than four or the design processing rate of 8,000 ton/hour assumed in other calculations is in error. In either case, the capacity of the pit conveyors determines the capacity of the quarry r. operations. Because operation at 8,000 tons per hour is reasonably foreseeable, the pit feeder emissions should be increased by a factor of four. ►� IV.D.6 Concrete Production and Recycling L The Draft EER states that the estimated annual production of concrete at the proposed ready-mix concrete batch plant would be 350,000 cubic yards and the L recycling plant would process approximately 100,000 cubic yards of concrete rubble B-38 per year. (Draft EIR, pp. 3-17, 4.6-21.) Review of the Excel spreadsheets provided by ESA shows that these process rates are the basis for calculating annual fugitive dust PM10 process emissions. (See Exhibit 1, "New Concrete Production and Concrete i. Recycling".) Process emissions are calculated by converting annual process emissions in cubic yards per year into annual process emissions in tons per year and V 33 We question this density.The in-place density of aggregate is typically stated as around 2 ton/yd3. The Draft EIR should support this density or revise the emission and other calculations to use the correct value. L 27