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5. 0 SIGNIFICANT ENVIRONMENTAL EFFECTS OF THE PROJECT AND PROPOSED MITIGATIONS 5. 1 LAND USE Continued development of this project will not change the existing land use at the project site. No County Land Use Plans or Policies will be affected by the proposed project. The General Plan designation is Agriculture, and the zoning is AG- 160. Quarries may be conditionally permitted in the AG-160 zone with a Quarry Excavation Permit if that portion of the property contains substantial deposits of mineral resources. The project site is classified by the State of California Division of Mines and Geology as MRZ-3, containing potentially significant aggregate deposits, the significance of which cannot be evaluated from available data. The anticipated net increase in day-to-day mining activity is expected to be slight; the current maximum capacity of 225 tons per hour is expected to increase to a maximum capacity of 350 tons per hour. Normal plant production levels should average 300 tons per hour or less. Expansion of mining activities will extend only into the remainder of the lease holding. Upon the conclusion of mining, the applicant will restore the land to its previous use as cattle rangeland. Topsoil will be stockpiled and redistributed in the reclamation process. There are no potentially significant impacts upon or irreversible adverse environmental changes to the land use. 5.2 AIR QUALITY A potential exists that the proposed project expansion will contribute to additional fugitive dust emissions. Current plant production is 225 tons per hour. It is anticipated that the proposed upgrades to the processing plant will allow the processing of 350 tons per hour, or a maximum of 25200 tons per week. The currently permitted operation, AP 88-268, is allowed by Conditions 8 and 9 to process a maximum of 500 tons per hour of raw material or a maximum of 5000 tons per day. E1 Rancho Rock and Sand, Inc. wishes to permit for a total of 350 tons per hour of raw material. However, as the entire processing operation occurs in a saturated state, it is not anticipated that an increase in throughput will result in increased emissions. Fugitive dust emissions from haul roads and hauling operations will be controlled as required per condition 3 of the Authority to Construct issued to the existing quarry operation. 23 CONDOR