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i lr r: result in 26 hourly truck trips:per hour during the_nighttime'hours. ]used upon Table 7 of the BAC report, the.average measurer!;.-hourly background no'i'se levels during the.tiighttime periods ranged-between 59 dBA,Leq,*d .62 dBA Leq at a-distance of 60 feet from the. conterline. (Site 4). This. -corresponds with the closest building facade to-the-roadway. , as stated in the RAC report. lfyou use the lowest SEI.value shown in the BAC report for truck passbys (79 dBA) at,60 feet., the Lori associated with the, 26 trucks. would be C2 dBA. Therefore, the nighttime noise levels would increase between 3 dBA and 4 dBA Leq. Based upon the.FICON-criferi'a :shown in Table 3 of the report, this would result in:a significant increase ih n"diie levels. What the analysis does not-r ention, is-that the increase in noise levels which trigger a significant impact is based upon an iricr�as.0 in noise levels of the same character. So, if the ambient noise during the. nighttime period is nota function of truck traffic, the indrease in noise levels due to truck traffic could be more annoying than indicated. MITIGATION OPTIONS 19. page 37 of the BAC report provides mitigation options. First of all we -do not believe that the impacts have been adequately identified,and therefore,mitigation treasures may not have been fully addressed. I.., '20.The wcommended mitigation measure for truck passbys seems unenforceable. Educ$ting truck drivers on proper gear usage, spccd and rpm of the engine is diffieult to enforce, at best. 21.The P�' mitigation measures indicate that upgrades to building facades is not g recommended due to the fact that there would not be a significant impact associated with truck passbys. However, the ANSI procedure used by 3,c, d r brennan & associates, Inc. indicates that the potential for sleep disturbanceis j 97%, which would indicate a significant impact. Building fakade upgrades would be a likely mitigation measure. A sound proofing analysis of the homes, conducted by an acoustical consultant would identify the appropriate upgrades to homes along;East River Road. "22. There is no mention of mitigation for the asphalt plant. BAC staff have previously worked on an asphalt plant in Truckee California, where noise VQmplaint resulted front nighttime operations. The installation of a silencer on.the stack of the asphalt plant burner resulted in significant decreases in noise levels. 6i 23.There is no mention of the use of strobes instead of back-up alarms on mobile equipment to reducenoise levels. 24.There is no mention of shielding of equipment through barriers or stockpiling.of resource to reduce noise levels. r 10 t