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Noise Mitigation for the Noise Path The final option for noise mitigation involves treating the sound transmission path through the introduction of noise barriers between the noise source and path. However, due to the wide range of exposures, orientation of residences, and other constraints, the construction of solid noise barriers at existing residences located along East River Road would not be a viable option for this project, CMq is not re con,imendeef.. CONCLUSIONS Relative to nighttime operations which have historically occurred at the Munn & Perkins site, the proposed continuation of those operations during nighttime hours as needed to service night .. paving projects would not constitute any appreciable change in nighttime noise environments. In addition, existing nighttime heavy truck usage along East River Road which is not associated with the Munn & Perkins operation currently presents the potential for noise impacts within residences located along that roadway. Nonetheless, this analysis concludes that, without mitigation, the potential for noise impacts associated with the production and delivery of asphalt paving materials from the Munn & Perkins facility on East River Road during nighttime hours . would be present at some existing residences located along East River Road for a relatively small number of nights per year. Because historic data pertaining to nighttime operations indicates an average of 11 nights per year of night operations between 1999 and 2005 (a total of 3% of the nights in the year), with a high of 26 nights of operation in 2004 (a total of 7% of the nights that year), it is important to note that night operations have been very infrequent. Relative to ambient noise conditions present on nights when there are no nighttime operations .... at the Munn & Perkins facility, nighttime operations would result in higher noise levels. This analysis concludes that such operations could result in noticeable noise increases at the exterior areas of existing residences located along East River Road, between McHenry Avenue and Santa Fe Road. However, increased noise levels during the relatively few nights per year that night-paving contracts require the production and delivery of materials during nighttime hours do not necessarily translate to adverse noise impacts at those outdoor locations as most people are not outside during those quietest hours of midnight to 2 a.m. The potential for adverse noise impacts due to the project would be present primarily within residences within 115 feet of East River Road with bedroom windows open and facing the roadway (please see Table 8). The likelihood of the potential sleep disturbance impact is a function of several variables. Those variables include whether or not residents were pre-notified of the nighttime operations, the number and distribution of heavy trucks during nighttime paving projects, the manner in which those trucks are operated, the distance from the potentially impacted residences to the roadway, the exposure of the bedroom windows of those residences to the roadway, the degree by which bedroom windows are screened from view of the roadway by intervening noise barriers, topography, structures, and orchards, and the position of the windows (open or closed). Environmental Noise Analysis Munn & Perkins Expanded Hours of operations-San Joaquin County Page 39