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,Ma,r. ] 8. ] 997 12: 55PM BRAUN INTERTEC CORP No. 3987 P 8/13 Minnesota Pollution Control Agency Project No. CMXX-97-0142 March 18, 1997 Page 5 Noise levels at the receptor locations are dominated by traffic on Interstate 35W, Cleveland Avenue and County Road D. Impacts of traffic noise would be reduced by buildings, landscaping, or noise barriers that separate the receptors from roadways. 3.5 Noise Monitoring Noise monitoring was conducted from 4:30 p.m. to 5:30 p.m. on February 4, 1991 and from 6:00 a.m, to 7:00 8.m. on February 6, 1997. The monitoring was conducted 75 feet east of the centerline of Cleveland Avenue in front of the commercial building at 2958 Cleveland Avenue and close to the location of the modelled receiver number 1. This location is directly adjacent to the residential neighborhood to the nom and the measured levels are representative of this neighborhood. Table 5 summarizes the results of the noise monitoring study. Table 5 '::':~';:;'l~.\:\\i.~ :... 'x:;' :.' '.:" ~'.;:'''~'. '.;';' : ",:. ; :,:",: ~':'.', ;::.: 'i'~~~~J~~,l~-:i~ '.>~";..;:~ . :.~~":;:~.;:<: :', :;.,~~.;<~.~> "'-'''~ 'Wilt1 ,.,..,'. x':')"'.:'.~~=:"'.r'" ~\1~~;~.' j~'.~~~1~t ::.: ;"!..: ".::~.:........ ~:.::~:.~.:~::~:; .::.~..,~>..:_ .:' _>' ,.... ~~:i :..,,'. .......... ~i~~{o: ~~ 6:00-7:00 a.m. ESE at 3 mpb 172 vehicles per hour 65 dBA 62 dBA 2/6/97 4:30-5:30 p.m. W at 7 mph 570 vt.hicles 1* hour 65 dBA 56 dBA 2/4/97 1 Based on traffic counts \aJcen during the noise monitoring. Includcs both north-bound and soudHIound tmffic. The monitoring data demonsttates that the traffic on Cleveland A verme was the dominant noise source during the February 4 afternoon monitoring and the traffic on Interstate 3SW was the dominant noise source during the February 6 morning monitoring. The louder freeway noise measured during the morning monitoring could be due to the difference in wind direction during the two monitoring periods and traffic may have been moving at a greater speed on 35W from 6:00 a.m. to 7:00 a.m. than it was during the afternoon rush-hour period. (!he ambient monitoring' data results are sligbtly higher than the assumed background noise revelS used for modelling as shown in Table 6.