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<br />JAH-19-2007 12:42 AM <br /> <br />P.02 <br /> <br />c " .. " , ." M 5 '" It"., A ~'lI n ~~ ~ '" ~ ." 1., c <br /> <br />Dive Ruft1n, AlA <br />11 January 2007 <br />Pap 2 <br /> <br />SUMMAav <br /> <br />This report providCJ an environmental nol" ...e.lrnent for the 311 MacArthur Boulevard <br />multi-family re8identlal development in San Leandro, California. The purpose of the study <br />Is to quantl~ the noise environment at the project site and provide necessary mitiption <br />recommendation. u applicable to City and State standard.. Thi. letter summarizes the <br />project'.lCOUItical stmdarda, noilR mcuurements, and minimum required Sound <br />Transmilsion elw (STC) I minas for exterior building facades. <br /> <br />In lummary, Interior nolle level. would be reduced to meet City standards by incorporating <br />aound-rated uaemblies. Exterior noise ievell at the public outdoor-use area will be reduced <br />to meet Cit)' pl. IS .hown on the project drawinp. Por further detail on the fUndamental <br />concepti of environmentallooustics, ploase refer to Appendix A and Figure AI. <br /> <br />hOlier DacaJPTION <br /> <br />The 31 J MacArthur Boulevard project I:onsim of 23 townhomes to be built It the <br />intenection of MacArthur Boulevard, Broadmoor Boulevard, and Henna Court. Each <br />townhousl will hive ita own prIIe for parkina. lOJ'Vod by . new, private drive off of <br />MacAnhur Boulevlrd. The .ite is located approximatel)' 950-foet west oflntentate 580 <br />(1-'80). A project "OP-ID area" (i.e., oUkloor-use space) is planned alonl the Henna Court <br />(WOlt) side of the sito2. <br /> <br />AcOtllTICAL CRITIIJA <br /> <br />State ofCalifomia Building Code (CBC) <br /> <br />Tho CaUfomla Bulldinl Code (Appendix Chtpter 12) oontaina aooustioal requiremonts for <br />interior lOuncllevols In habitable roaN for multi-family lancl-uae. In Iwnmary, tho CBe <br />rcquirca an interior noite level no higher than DNL:\ of 4S dB. Projects exposed to .n <br />exterior DNL of60 dB, or peator, require an acoultical analy.tl 8howinl that the proposed <br />deaip wfU limit interior l.v.1s to the premibtd allowable interiorleve!. Additionally, if <br /> <br />I SClWId ~ ClMI (STC) - A IiDaJe-mtmblr IatIq ..~ by 1be AlDwin 800lety for <br />Tad.. and Matmal. (ASTM) and UMd to nte the IICJ1Iftd inauladoa protxrtlal of buUdlna putitiont. The <br />STC 1'IIIn." dtrim from Ilbo1'atory m...1Il'eIDCIU (In lClOOrdIDce whh E 90 and B 4(3) oh pII1loullr <br />bufldtnl clC11lcnt aud it ~y. ofCh. maimum IOWId maulation. lDcrcuint the STe I'IItin. <br />oormpcmdl to tmptOved lOund laluJltion. <br /> <br />2 Shown on Sboot A 1.19 of the 8 November 2006 drawiq let. <br /> <br />3 OI)'-NiJht Avtnlle Sound Lev.1 (ONL or L.,J - A desoriptor _bJiDd by the U.S. Enviromncdal <br />ProWctIcm Apnoy to detortbe Ihe IvtI'Ip ..y-nllht level WlIb I penIIty applied to nolle ocourrifta cIw1n. <br />tlw; nilJdtilJll! hours (10 pm -7 ml) to lClOOuat fm dill inon:ucd IaIIitMty of people dwq I10cpq hD\n. <br /> <br />I'" tvcler Inet.." '''''''''' 0alllHna1410ol T,I: .,'.7 O+tl "'I; 41t "T gn. -..~"r.."" <br />