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prevailing wind direction, wind speed, temperature, atmospheric conditions and topography. 7. Pages 14 through 16 of the BAC report provide a discussion on the ambient noise environment along the East River Road. This was obviously a very comprehensive noise measurement program. It would have been useful to have a series of aerial images which clearly show the residences where the noise monitoring occurred. 8. Table 6 of the BAC report indicates that Residences 2 & 3 are separated from the road by a solid noise barrier. During the site visit to Site 2, j.c. brennan & associates, Inc. staff noted that there are three large openings in the barrier for access to the residences. These openings in the barrier virtually render the barrier as ineffective. 9. Table 7 of the BAC report clearly shows that residences along East River Road already exceed the San Joaquin County noise level standards for transportation noise sources by up to 10 dBA(75 dBA Ldn). ANALYSIS OF PROJECT NOISE IMPACTS 10. Page 19 of the BAC report identifies the noise impacts associated with the nighttime asphalt operations. Once again, we do not believe that the predicted noise levels associated with the asphalt plant operations, or the methodology for determining the asphalt plant noise levels are accurate. It is quite likely that the plant could exceed the nighttime noise level criterion of 45 dB Leq. 11.The report only evaluates the plant operations at the residences to the east. However, there are residences closer to the project site located along E. River Road. Although it is true that the noise environment at those residences will be dominated by truck traffic, the time periods between truck passbys may be dominated by noise associated with the asphalt plant operations. A detailed noise contour associated with the asphalt plant operations should be developed which shows the potential noise impacts at all receivers. 12. Page 27 of the BAC report provides a discussion on "Optimization of Heavy Truck Operating Parameters to Minimize Passby Noise". This analysis provides good insight into the variations in operating conditions and how they affect the noise generated by the trucks. However,the education of individuals on the use of proper speeds and gear selection is extremely difficult to enforce as a mitigation measure. During the site visit on March 23, 2010,j.c. brennan staff drove East River Road several times while maintaining the speed limit. During this time,trucks which were approaching from behind were clearly exceeding the posted speed limit. 6