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I I I I I I I I I I I I I I I I I I I TABIE 5 NOISE lEVEL S'I'ANJ:Y\ROO - MINNESC1rA rommoo CXNIR>L AGENCY(1) Nightti1re Noise revel (10 P.M. to 7 A.M.) General land Use 1)iyt1me Category 'lyPes Noise level NAC-1 Residential an.:l 1.:1.0 of 65 d&\ Institutic:nli Iso of 60 dF!A NAC-2 Cc:mnercial am L:to of 70 dBA. :Recreatic:nli Iso of 65 dFA 1.:1.0 of 55 dBA Iso of 50 dF!A L:to of 70 dF!A Iso of 65 dBA L:1.0 of 80 dBA Iso of 75 dBA 1974. NAC-3 Imustrial L:1.0 of 80 dBA. Iso of 75 dFA (1) NPC-2 Noise stan:iardsi Mcpted September 17, Estimation of ExistiDg Noise I.e\Tels For each receptor identified., existirq noise levels ~ detenninecl by usirg the Federal Highway Administration (FHWA) level 2 Highway Traffic Noise Prediction M:xlel, STAMINA 2.0. Backgroond noise m:mitor.in:J was also corrlucted on October 13, 1988, between 9: 00 A.M. an:1 12: 00 P.M. at all identified receptor locations. Existin;J noise levels were predicted usi..D; P.M. peak-ha.1r traffic volumes. When cx:xrparirq ambient levels (DDnitored) an:1 existirq predicted levels, it should be noted that the predicted levels usually represent the noisiest corrlition for traffic-related SCJJrOeS. Ani:>ient levels are a sample and, generally speaJd.rg, represent the noise level only for the day and time of the sample. 'ttle ambient SlUVey was not extensive enough to allCM" for the determination of the existirq noisiest oon:iitions at any receptor. '!hus, the irdicated measured ambient levels will generally be less than or equal to existirq predicted traffic ooise levels. Predic:tec! Noise Ls'Iels For the project \.mJer evaluation, traffic noise was predicted at each receptor for the year 1995, usi..D; the FHWA level 2 Highway Traffic Noise Prediction M:xJel, STAMINA 2.0. '!he FHWA cx:arp.rt:.er program STAMINA 2.0 is described in report FHWA-RD-78-138. 'Ihe traffic ooise m:x:1el on which this computer program is based was developed. by the Federal Highway Administration and is documented in FHWA report, FHWA-RD-77-108, "FHWA Highway Traffic Noise Prediction fokx:lel." 'Ihis m:rlel uses the rn..nnber and type of vehicles a1 the planned roadway, their runn.i..rxJ speeds, am the Plysical characteristics of the roadway (e.g. horizontal an:l vertical aligrnnent). Each receptor was m:rleled assumin;J that no special noise abatement measures would be i.Jxx>rporated. '!hus, the analysis represents "worst case" t:q:Jograpric oon:ii tians. 17