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As a result of the following conditions and implementation of the recommended noise mitigation measures, noise impacts associated with occasional nighttime operation of the Munn & Perkins asphalt plant and heavy-truck load-out of asphalt materials are predicted to be less ffi asl • Night truck operations associated with Munn & Perkins operations have historically occurred in the area so the proposed action represents a continuation of those occasional nighttime operations, rather than the introduction of new nighttime operations. • Residences located along East River Road are located within an Agriculturally Zoned area where the County's right to farm ordinance indicates that occasional nuisance noise should be expected and does not constitute a noise impact. • Residences located along East River Road are already exposed to occasional nighttime truck passbys that are not related to Munn & Perkins operations, so the project would not be introducing nighttime truck noise into an area where it does not already exist. • Historic data pertaining to previous Munn & Perkins nighttime operations indicate that such operations have been very infrequent. • Extensive testing of heavy truck passby noise has resulted in the identification of truck operating parameters which are optimized to reduce noise at residences along East River Road. All truck drivers accessing the Munn & Perkins facility will be notified of the reduced noise procedures. • Residences located along East River Road will be notified in advance of upcoming night paving projects, thereby providing them the choice to close bedroom windows if desired -- based on their individual sensitivity to noise. • The recommended project standard of significance for interior noise levels during truck passbys (65 dB SEL within bedrooms) would result in only 5% of the population potentially being awakened. The maximum exceedance of the 65 dB objective is 4 dB, which would still result in less than 10% of the population being awakened. • For the 65 dB SEL interior objective to be exceeded by project trucks using the optimized operating parameters, residences must be located within 115 feet of the roadway centerline and bedroom windows of those residences must be open and must face that roadway. Of the 7 unshielded residences which satisfy the distance requirement, it is unknown if the bedroom windows of those residences have direct exposure to the roadway. Environmental Noise Analysis Munn &Perkins Expanded Hours of Operations-San Joaquin County Page 40