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night, noise generated by the maximum project truck generation (26 hourly trucks) would not significantly exceed existing ambient noise levels. However, Appendix D also illustrates the generation of 20 project heavy truck trips in an hour would result in exceedance of measured ambient noise levels during the 1 a.m. hour for typical weekday conditions at three of the five locations monitored. Therefore, it is likely that during the quietest hours of the night the changes in hourly average noise levels due to project-generated truck traffic would be clearly noticeable outdoors. Although the project will occasionally result in clearly noticeable increases in average noise .. levels during the quietest hours of the night, those increases would not necessarily translate to adverse noise impacts. As described previously, the noise generation of the project would occur primarily during sleeping hours, so residents along East River Road would not likely be .. outdoors during those hours affected by the project. It is more likely those residents would affected by noise generated inside their bedrooms by individual passages of heavy trucks than by changes in outdoor average noise levels associated with several such passages. Impacts . associated with sleep disturbance were evaluated previously in this report. Although the project may result in clearly noticeable increases in average exterior noise levels during the quietest hours of the night (midnight— 2 am), given the reduced noise-sensitivity at �.. outdoor locations during those hours this impact is considered loss than signific,',mt. Summary of Potential Project-Related Noise Impacts Not Related to Adopted County Noise Standards The following bullet list summarizes the findings of this analysis with respect to the potential significance of project-related noise impacts: Jake Brake Usage: Due to the low percentage of observed Jake Brake usage and a . relatively small increase associated with the trucks which were observed using Jake Brakes (2 dB SEL increase), noise impacts associated with Jake Brake usage during nighttime truck passages associated with this project are not expected. Less than significant. • Sleep Disturbance During Individual Truck Passages - Bedroom Windows Closed: , With bedroom windows closed, SEL values within residences located along East River Road are predicted to be below levels which pose a significant probability of sleep disturbance. Less than • Sleep Disturbance During Individual Truck Passages - Bedroom Windows Open: With bedroom windows open, SEL values within residences located along East River Road could exceed levels which pose a significant probability of sleep disturbance. Environmental Noise Analysis Munn&Perkins Expanded Hours of Operations- San Joaquin County Page 35