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EVALUATION OF EXISTING NOISE ENVIRONMENT The daytime ambient noise environment in the immediate project vicinity is defined primarily by the various processing plant activities (asphalt plant, crushing plant, etc.), but is also affected by local roadway traffic. The nighttime ambient noise environment is consistent with that of typical rural areas and is defined primarily by natural sounds, (wind, birds, insects, etc.), and by - intermittent local roadway traffic. During the previous periods of night operations at the Munn & Perkins facility, the nighttime noise environment was also influenced by plant operations and additional heavy truck traffic on East River Road. For this project, there are two distinct noise environments to consider. The first is the noise environment at residences nearest to the Munn & Perkins plant site where the residences are more affected by on-site plant equipment noise than off-site traffic noise. Examples of such locations include the residences located at Sites A and B in Figure 1. The second noise environment to consider for this project is the noise environment at residences located along East River Road which are more affected by noise from traffic on East River Road than by noise generated by on-site plant equipment. Examples of such residential locations include residences represented by noise measurement Sites 1-5, shown in Figure 2. It is necessary to distinguish between these two noise environments because the nighttime operations would result in noise-generation of two distinct sources of noise. Those two distinct sources include on-site equipment (primarily the asphalt plant), and off-site truck traffic. As a result, the proposed project could affect various residential receptor locations differently. Therefore,. separate discussions are provided below for ambient conditions at each distinct receptor area. It should be noted that some receptors are affected by both on-site noise sources and East River Road traffic noise sources. In such cases, impacts are evaluated at ... those locations for both noise sources even though they are included in the category below which most heavily influences project noise levels at their location. Ambient Noise Environment at Receptors Affected Primarily by Asphalt Plant Noise Sources The closest noise sensitive receptors to the plant site which are primarily affected by on-site plant-related noise sources (i.e. nearest receptors not affected by traffic noise from East River Road); are residences located near noise monitoring Sites A and B, shown on Figure 1. These _.. residences are located generally east and southeast of the plant equipment, approximately 2.200 feet east and 3,000 feet southeast of the asphalt plant equipment. Although there are closer residences to the existing asphalt plant equipment than those represented by Sites A & B on Figure 1, those residences experience higher ambient conditions due to their proximity to East River Road. As a result, the evaluation of ambient conditions at locations affected primarily by asphalt plant noise alone focuses on the residences represented by Sites A& B. Environmental Noise Analysis Munn&Perkins Expanded Hours of Operations-San Joaquin County Page 11