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' Alternative 1: Proposed ProjeclE nd Alternative 2: Prol2ased Project with Alternate Northern Access Road 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 erate a second shift. Th I� e asphalt concrete plant located on the same property would operate approximately 150 days per year on a single shift basis. On special occasions night paving maybe required by Caltrans or other local agencies. � It The quarry would be mined using excavation and hauling equipment. Short raw material hauls would be made with self-propelled scrapers. Longer hauls would be made with conveyors and off-highway trucks. Most-of the raw material would be excavated and I ., hauled during the summer and fall months using a single shift, or a double shift on rare y occasions. Each phase would be mined and the previous phase reclaimed in a continuous operation. i Quarry production would start with the excavation of the recycle ponds. This area would be used though Phase I of the proposed mining plan for the storage of recycle wash water. The mined sand and gravel would be transported to the processing plant stockpile or directly to the plant raw material feed system. After the raw material is metered though the feed system, it would be passed over a vibrating screen to remove the natural under size sands and gravels. All over size and part of the under size raw material would be ,.f transported by conveyor to the raw material washing system. Over size rock would be } crushed to the required top size and rescreened for final size separation. !E The final sized and washed sand and gravel would be stockpiled by size. The finish I� construction materials would be a blend of different sizes of aggregate. After blending, construction materials would be loaded on trucks for shipment. Production capacity is II designed for the range 300 to 600 tons per hour on a single shift basis. Mine and 1: } � processing plant life is between 50 and 60 years. �G On site asphalt concrete production would utilize on site aggregate production and 3 i imported materials. Production would be on a single shift basis starting at 5 Ann. Special II r-� production shifts may be required for night paving on major highway construction. Table 4.6-2 shows the reference noise emission levels used in this analysis for the various processing area noise sources, the locations and distances to the nearest property line and j residential areas, and the predicted processing area noise levels at those locations in terms of L,�q and Ldn (Le, and Ldn being equal assuming two hours of nighttime activities). ,R I� it II I� a I�Draft Environmental Impact Report 4-89 ER-96-3 � E E K I