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} i Table 3-2 l . Quarry Volumes per Phase (in Cubic Yards) u } . Phase 1 4,583,600 1 t� Phase 2 8,121,700 , Phase 3 a 7,589,500 Phase 4 2,575,000 i Totals 22,869,800 Table 3-3 I i Aggregate Production and Estimated Life Time Period Production Totals Iwy i First 7 Years 400,000 Tons/Year 2,800,000 Tons Remaining 49 Years 550,000 Tons/Year 26,950,000 Tons 13 Total Quarry Life (56 Years) 481, 250 Tons/Year 29,750,000 Tons i Ir �� J „ The aggregate plant would operate on a single-shift basis for about 200 days per year. In times of very high demand the aggregate processing plant may operate a second shift. The ' i second shift(specifically truck traffic to and from the project site), however, would not occur during the 4-6 PM time period (peak traffic hour). (Refer to Section 4.4 for additional discussion of traffic.) The asphalt concrete plant located on the site would operate i, approximately 150 days per year on a single-shift basis. On special occasions night paving may be required by Caltrans or other local agencies, and the plant would be operational during those events. is Mining Operations As proposed, the quarry would be mined using excavation and hauling equipment that produces the most economical products. Short raw material hauls on-site would be made IJ with self-propelled scrapers. Longer onsite hauls would be made with conveyors and off- '. highway trucks. Most of the raw material would be excavated and hauled during the summer and fall months using a single-shift, or a double-shift on rare occasions. Each ' phase would be mined and the previous phase reclaimed in a continuous operation. Working slopes are proposed to be excavated to a slope of%-.1. Final slopes would then be backfilled against the working slopes to create a final proposed slope of 1 Y2:1, with 20- foot benches every 40 feet. k� . 1 ' I Draft Environmental Impact Report 3-13 ER-96-3