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5. 5 NOISE San Joaquin County Ordinance requires that the sound level shall not exceed 65 db Ldn at the property line of adjacent properties which are developed residential, zoned residential, or shown for residential use on the General Plan. The applicant has completed and submitted as Appendix 11. 6 a Noise Study to evaluate existing and future noise levels associated with the project. The study has concluded that noise produced by typical excavation operations would be within acceptable limits as defined by the San Joaquin County standards. Based upon the conclusions in the acoustical study, the project-related noise is not expected to exceed the maximum noise levels listed in Section 9-3500 of the Planning Title. Field measurements at the property line of the noise emissions from backup horns on mobile equipment are barely perceptible on the sound meter. Sound levels are not quantifiable due to their short duration. However, the noise produced by backup horns is potentially very annoying. It is El Rancho' s intent to institute and enforce a written policy to minimize the annoyance of this noise. To the extent practicable, the excavation and processing operations will be reconfigured to minimize the necessity of backing up the equipment. Mobile equipment shall not be left in reverse gear when parked or in a stationary position, in order to reduce unnecessary use of backup horns. One area in the southerly portion of the site has been identified with an Ldn of 66 . This Ldn would occur only at those times when quarrying operations take place within 250 feet of Waverly Road. The property potentially impacted by these noise levels is zoned Agricultural, under Williamson Land Act Contract, with no residences. Ldn levels from 50 to 70 are considered to be "Normally Acceptable" by the San Joaquin County Council of Governments Noise Element. Ldn levels of 65 db or less are considered "Acceptable" for areas of residential development by the San Joaquin County General Plan. There are no potentially significant impacts upon or irreversible environmental changes resulting from noise impacts. 5 . 6 TRAFFIC AND TRANSPORTATION The possibility that the proposed project expansion would have an adverse impact upon traffic and transportation was investigated in detail . 27 CONDOR