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Analysis Background Phase I of Quarry Excavation Permit No. QX-80-0001 to remove 7 million cubic yards of sand and gravel was approved on July 22, 1982. Phase II to remove 3.4 million cubic yards of sand and gravel was approved on August 21, 1986. Revision of Approved Actions The applicant is requesting to change the hours of operation for the gravel processing plant for the "Huck Pit' and "Kerlinger Pit" to 24 hours per day, Monday through Saturday. The existing quarry application permits operation of the gravel processing plant from 5 a.m. through midnight, Monday through Saturday. This request is being made because the main gravel processing plant, which was originally constructed in the 1940s, has been shut down permanently due to maintenance concerns. The gravel processing plant the applicant is proposing to use on a 24 hour basis is their smaller plant. The smaller plant will produce essentially the same amount of product as the old plant but needs to run continually 6 days per week to achieve the same output. Noise The plant is located in the middle of the 407 acre site. There are operating quarries located to the west and north of the project site. These quarries also operate 24 hours per day. There are two residences located on Tracy Boulevard near the western boundary of the quarry. Residence#1 is located on the west side of Tracy Boulevard, approximately 2,000 feet from the plant. Residence#2 is located on the east side of Tracy Boulevard, approximately 2,500 feet from the plant. There are two additional residences located on MacArthur Drive,which are near the eastern boundary of the quarry. These residences are located on the east side of MacArthur Drive, approximately 3,400 feet from the plant. Due to the distance between the _ plant and nearest residences, it is not anticipated that the noise generated by the operation of the processing plant for an additional 5 hours per day will result in significant noise impacts. Traffic The increased operating hours of the processing plant will not increase truck trips to the facility. Truck trips will continue to occur only between the hours of 6:00 a.m. and 3:30 p.m. The number of daily employee trips to the plant will remain the same. Approximately 4 employees will be reassigned to work the night shift at the processing plant from 9:30 p.m. to 5:00 a.m. No significant traffic impacts are anticipated due to the increase in operating hours. San Joaquin County QX-80-0001/Lone Star Aggregates Community Development Page 3