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chipping equipment would only be run for short durations in any given locale, generally less than a day and on an intermittent basis. In-coming and out-going truck traffic would increase noise levels on Mariposa and Austin Roads. As Mariposa already has a truck volume of about ten percent, the sound level increase due to project-related traffic would not be appreciable. Truck traffic on Austin Road associ- ated with the project would create a distinguishable rise in noise levels. This would not be a significant impact, since the relatively low volume of traffic would generate an average sound level of less than 50 dBA. Given the largely agricultural nature of the project area and the 600 feet between the facility and the nearest residence, the operational impact of the facility is not considered significant. Project-related noise at the nearby residence would be in the range of 64-66 dB, which is above "normally acceptable" levels for dwellings according to the Count noise guidelines. Given the facility noise levels fall within the guide- lines "conditional " acceptability range, the impact would not be signifi- cant and with proper mitigation measures could be made minimal . Mitigation Measures. The following measures are recommended to reduce the impact of operation-related project activities: • Once actual equipment, particularly conveyors, sorters and screens has been specified, appropriate noise control features should be designed. Enclosures to buffer those pieces of equip- ment with sound levels in excess of 80 dB should be required as part of the County's Use Permit. This should ensure that noise impacts on the adjacent residence would be below 60 dB as stip ulated in the General Plan guidelines. Hearing protection foJ workers may be required when they are within the enclosure. • To supplement the above-named measure, an earthen sound berm o six to eight feet with shrub and tree planting should b considered to border the facility access roads on the west an south sides of the facility. This would serve the dual valu of providing an effective visual as well as noise buffer to th 3-72 101-31.R5 4/10/89