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4. The ~fPCA requested three items relative to noise: Report results of noise analysis for nighttime: (10:00 P.\! to.i:OO .-\.\1) conditions: Compare predicted noise fevers to the L~o standards: and Explain how noise monitoring results might change from the: wintc:r moniroring period to the summer conditions. Response: As noted in the EA W, ;'the majority of the proposed land uses for the T\\in Lakes Development will operate during normal office hours (8:00 AM to 5 :00 P,\f) and wi II generate I iuk or no traffic during nighttime (10:00 PM to 7:00 AM) hours'" Nighttime noise levels can be; estimated based on the relationship between traffic volumes during the PM peak hour and the peak nighttime traffic hour (typically 6:00 to 7:00 AM). 24-hour Automatic Traffic Recorder (A TR) counts from 1994 on Fairview A ve:1ue and County Road C indicate that traffic \'olumc:s during the; peak nighttime traffic hour are approximately 30 percent of the traffic volume during the P~I peak hour. This difference in volume would result in nig.httime noise levels approximately 5 dB.-\ less than the peak da)1ime levels reported in the L\ W. The nighnime noise st:lI1dard is L]<J 55 dBA. II' nighttime noise levels are 5 dBA less than the peak da:-time noise lewls reported in the; E.-\ \\'. nighttime noise levels would exceed the statL' st.1ndard at two of [he titreL' receiver si[es anal:- 2:",,1 in the EA \\'_ The EA \\' reported monitored existing and prt:di":lt:d L;-, noise 1<=\-o:ls_ Tho: L~,~ 5[;Ite; S[and:HJs Jr:.' I., 60 dBA for the da;.1ime period and L~,) 50 dBA for the nighnime paiod, \lonilOr<:d L,. (b:, UI~;;; noise le\'els were: Receiver Site I -- 58 dB:\ Receiver Site 2 -- 55 dBA Receiver Site 3 -- 52 dBA The noise prediction methodology used for this project does not yield a predicted L~o noise k\-<:1. Based on the monitored levels, it is expected that the L~ noise levels will be 4 to 6 dBA less than (he; predicted L,o noise levels. Traffic noise levels monitored in the vicinity of the project during the winter could be slightly different than those experienced during the summer months for the foHowing reasons: The noise monitoring was conducted during the months of February and March when there was snow on the ground and the roads were dry. Hard packed snow, such as existed during the monitoring, would tend to reflect more noise than vegetated ground surfaces that would be present during summer months_ This would indicate that weather conditions could tend to result in slightly higher noise levels during the winter monitoring than would be experienced during the summer. According to the A TR traffic data, traffic volumes during the months of February and March could be as much as thirty percent less than during June_ Traffic volumes thirty percent higher than those occurring during the monitoring would result in noise levels approximately I dBA higher. 4