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I I I I I I I I I I I I I I I I I I I ~ n." L.~ ,.... ___,...... . ......... .... _. 'r '" Receptor B was located at a sin:Jle family resi.deJ'Da alc:DJ Clevelam Avenue. Similar to the proposed hotel, existing and future noise levels are relatively high. All predicted mise levels are in exa:ss of the MPCA starrlards. However, the irx:rease in mise levels fran the pre- to post- develcpoont scenario is less than 2 dB1\. durin] the P.M. peak hour pericx:l arrl less than 0.3 dB1\. durin] the 6-7 A.M. pericx:l. It shcW.d be D:Jt.ed that noise increases of less than 3 dB1\. are oonsi.de.red inperceptible to the human ear. Receptor C was located at a shqle family residen=e alorg County Road D. As with receptor B, all predicted noise levels, existin:J am future, exceed the ~ starrlards. ~ 1OOI1itored L(10) level was also above the st.arrlard. Hc1NeVer, the in::rease in traffic volume fran the pt:qx:se:i developrent will cause negligible mise increases (0.5 dB1\. or less) ~ canparin] the pre- ard post- develCJPISrt: scenarios. ocmstruction Boise Constrocti.on of the centre IOinte Business Park is expected to be CCIlTplet.ed by 1994. Site gradj.n; ard utility installatiOn occurred in 1987-88 together with the first buildi.rq pm;uant to the 1986 in:lirect source permit. SUbsequent CXJIlS'b:uction of bui1~ will follow in stages. Trucks an:! machinery used for constnIction praluce mise which may affect sare of the susceptible lan:i-use areas durin3 each construction phase. Table 8 presents typical mise levels for equipoont likely to be in use duri.rq oonstruction. 'Ihe acbJa1 noise levels produced at a given location will vary considerably depending upon the number of pieces being simJ]:tanea.1sly q:erated, the percent of time in qeration arrl the distance frcm a receptor to the different pieces of equipnent. Analysis of Table 8, typical oonstruction procedures an:i the location of receptors, irrlicates that the susceptible areas previoosly identified will receive oonstruction mise in varyirg degrees, '<<hich at tines may be annJYhq an:! in excess of MR:A ~O starrlards. TABlE 8 TYPICAL cx:RS'IRJCI'IOO MACHINERY OOISE (1) dM at 50' dB1\. at 100' dBA at 200' Backhoe Dozer Grader Loader Paver Roller Scraper Truck 79 74 79 73 83 68 82 85 73 68 73 67 77 62 76 79 85 80 85 79 89 74 88 91 (1) Source: Traffic Noise and Vibration Manual, Illinois Department of Transportation, Mard1 1977. 20