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There are approximately 22 residences located within 350 feet and 4 located within 60 feet of East River Road <br /> between Mc Henry Avenue to the west and Santa Fe Road to the East. With bedroom windows of the nearest <br /> residences along the project corridor in the open position, the project will present a higher probability of sleep <br /> disturbance. Furthermore, the potential exists for interior SEL values to exceed 65 db at 7 of the residences <br /> 115 feet (provided bedroom windows are open) from the centerline of East River Road as a result this impact <br /> is considered a potentially significant. <br /> Impact 3.4.1: Off-site project haul truck traffic would add to the noise environment in the project <br /> vicinity. This impact would be potentially significant. <br /> Mitigation: <br /> Measure 3.4.1: All project trucks shall be operated using noise-mitigating operating parameters when <br /> entering or leaving the plant on East River Road. Based on testing conducted by Bollard Acoustical <br /> Consultant, Inc., the quietest haul truck operating parameters were as follows. <br /> • Empty Trucks: Travel speed at 38-43 mph with engines in 8`"gear at 700-800 rpm. <br /> • Loaded Trucks: Travel speed of 33-35 mph with engines in 6" or 7" gear at 1,400-1,600 <br /> rpm. <br /> Furthermore, truck parking anywhere along River Road and the use of jake brakes at the McHenry <br /> Ave/E. River Road intersection and the E. River Road/project driveway is prohibited. The applicant <br /> shall monitor full time for compliance with these requirements beginning 30 minutes prior to any <br /> approved extended hour operations. <br /> Significance After Mitigation: Application of the proposed optimized haul truck operating parameters in <br /> Mitigation Measure 3.4.1 would be expected to effectively mitigate project-related noise exposure from the <br /> perspective of the applicable County noise exposure level criteria and noise exposure level increase criteria (as <br /> described by the L,,). However, application of the optimized haul truck operating parameters would not appreciably <br /> mitigate the significant increase in probability of residential awakenings due to project haul truck operations <br /> (single-event noise). Due to the significant increase in probability of residential awakenings in the project area <br /> due to project haul truck pass-bys, this impact is considered significant and unavoidable. <br /> San Joaquin County QX-89-0002/Aggregates Inc. <br /> Community Development Page 8 <br />