SU0007300 - Laserfiche WebLink

Home Browse Search

of proper speeds and gear selection is exlerriel�+ difficult to enforce as =a mitigation itzeastire . Tha aAC report-indicates that the anal -tfs-of truck npise impacts Will assume #,hat truck drivers are 0p04x6'9 vehicles 'i:p' the "quietest manner, possible!. This analysis'is.,not.a eottsem4t1vo:apprb4cb- tb'evaluatitg. fraise .impacts: This would..$cern to:izzdt`cate that tliet`e. has been pan identified signifimt impact,•and;that.miligation,neasuresare.being ttrtplera ,nW D. The BAC report conducts an -uvaEnation of increased nprse levels due to..the: project The analysis correctly utilizosih po�odurewhtfi.iodicates-thatFc if existing baekgrouiid .noise levels-exceed '65 dBy.a 1:.5 dB.increase would be regained to trigger a significant:increase in poise levels: lf=.bxtsttng"ba 'kgrq end- nciise.Ievets r'angL°laetween:G0dF3 aiid 55:413;a�dB it►erease�ould�tie rejuiredto i f trigger:a signifieaw increase in noise levels. .In additiort•,Af existtn blck:grou.nd 3� noise.levels are.less than 60 dB, a.5 61ncrease would be required to.trigger a significant itierea$e in noise levels. That beinil; said; if you teview.the�e"ai,sur6d baokgi•oun# ribise levels. dtairied: within the appendix to -thc repot the background hourly average (Leq) values } during the 9!Z0 p fahour at Norse MQasuretnent Sitcs 1, 3, 4 &. 5; which ley+ represent cltstwwos ;between =40 feet. ;and: 60 fmtfrom :the .East River R040 centerline,the.noise'lovels rnnge;between tit d13 and.-M dI3`Leq. Based upoii the average measured&Ook,passby noise-levet of S6 dB i3k,L,at a distance q.f 40 feel, and tlie.predicted antieipated 66 truck trips dating the.9 OQ p m, hoar associated with the Munn Perkins plafit, bx- p4MiOtiy the noise- lover 4fAociatsd with the additional track#.rips would,be'68 G dB Leq, Thgreforc.,Clip contul4ve increase in true k-traits noise levels rs.expected:to range between 3 dB anti 7 dB•Zeq. So clearly durinb the sMa-up of the :fruck Oaffic, there would be a sigriificatit increase truck tra#`fic noise,l'evel.s. The:report Ones.nof'provide ibis en'nclusion. SPl✓CI IC COMMENTLS O.N T11kD'..BAC`REP'S) 'T, Crit+eria-fof Acceptable Nd4r Expo'auk6 1: The teport.provides a.discussion, oil-i?.age:6x that-doseribas:the effects of.single event noise: The discussia.n ec*nters:a7 outtd #ixe ppton#tai for sleep disturbance, and utiiixes the Federal Interagency Committee ou Aviation Noise (1~ICAN). report whiclx estimated a 5— IQV( -of the population-is afI',eet'ed when interior SEL fraise levels-are between 65 and$1 iB,.&nd.few sleep:,awakenhigs(less than 5%) are predicted it the .interiox SEL is less. than 0 dB. Flowever, most resent research and procedures for evaluating sleep disturtian'ce- are -based upon the American National Standards Institute (ANSI;) whidh has .developed procedures for evaluating the potential for sleep disturbance: The Procedure ANSI/ASA SI2.9=2008 / Part 6 sets.for the procedures:for evaluating the.,potential for sleep disturbance. It esiablishes a.thres.hold'for a:single event for.w"hieh the Arweighted sound exposure level (ASEL)which occurs within a room at 50 dBA. The ANSI procedure.calculates the probability of awakening based ripon the interior mean • I 3 I