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<br />1'\.111\ <br />li\ <br /> <br />t <br /> <br />SOLTON &. ~ENK, <br />Consulting Engineers & Surveyors <br />12224 Nicollet Avenue. Burnsville, MN 55337-1649 <br />Phone (952) 890-0509. FAX (952) 890-8065 <br /> <br />INC. <br /> <br />MEMORANDUM <br /> <br />Date: <br /> <br />Apr; I 9, 200S <br /> <br />To; <br /> <br />Kristine Giga, P.E. ~ Civil Engineer <br />Greg IIoag - Public \Vorks Director <br />City of Arden Hills <br /> <br />From: <br /> <br />rirA <br />Christopher S. Chromy. 1'.10., 1'.T.O.E.l"cL/ <br /> <br />Dale Maul, M.S. - Environmental PI(lIlncFt:/~--- <br /> <br />Bolton & Mcnk, Inc. - <br /> <br />RIO; <br /> <br />Overview ofTIIIO Borrier Study. t<.tareh IS, 200S <br />1-694 Environmental Assessment <br />BMll'rojeet No. T42.22335 <br /> <br />On behalf or the City of Arden Hills, we have reviewed and summarized the referenced Mn/DOT study <br />prepared by S.E.H. The purpose oflhc study was to document existing noise levels and Inodcl future <br />noise levels with estimated 2030 traflie volumes along Till 0 between 1-694 and CSAH 96. <br /> <br />Backe.round <br />Noise created hy vehicular traffic 011 highways is rated nn a decibel scale. This scale \Vas designed to <br />match our hearing mechanisms and docs not work the sallle ,15 most other I~lmiliar scales. ^ sound that <br />increases by ] 0 decibels is said 10 tkHlb1c in loudncs:;. Thercftm::, a source will sound twice as loud ifits <br />level increases rrom 60 to 70 decibels. However, a 3~decibcl change is barely noticeable to most people. <br />To betlcr understand the /\-weighted decibel scale used for highway traftie noise, the following <br />comparisons arc provided: <br />J 0 dB(A) Normal breathing <br />20 dB(A) Whisper <br />30 dB(A) Library, Secluded Woods <br />40 dB(A) Refrigerator <br />50 dB(A) Clothes dryer, Railll,dl <br />60 dB(A) /\ir Conditioning Unit, Normal Conversation <br />70 dB(A) Piek up Inlek ('.Ii 50 mph, Business Offiee <br />XO dB(A) Heavy Truek Tranie <br />90 dB(A) Lawnlllowcr, Chainsaw. Hair Dryer <br /> <br />Thc sOllnd of a train horn sOllnding at railroad crossings can be over] 10 dB/\ :1t 100 feet. Audible <br />cOllllllunication usually ceases whelllhc hackground noise exceeds 90 dBA. (American Public \Vorks <br />Administration alld lilt Federal I\,til Administration, FRA) <br /> <br />MANKATO, MN . FAIRMONl. MN . SLEEPY EYE. MN . BURNSVlllE. MN . CHASKA. MN <br />WlllMAR. MN. RAMSEY, MN . AMES, IA <br />\t/\w/.bolton.menk:.com <br />An [quo! Opporl"nity Employer <br />