3A Public Hearing 2007 0507 - Laserfiche WebLink

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JAN-19-200? 12:4~ AM P.04 P""fl~1l ~ SR~t~" At'~Oo.:>1'!'!!Jl!l 3,,!;'~ Dave R.uffin, AlA 1 t January 2007 Paae 4 Table 2 below and attIehed Fipe Ilhow . lummuy o(th. lCOusti~al mellurement I.ooatlonl. The pulpOlC of the short-term mOllurem,ntl is to quantify the noise levels at the setbtck o(the propolOCl buildinp. T.ble 2: a.-site M............. Me.ltar Leatlt. M....red DNL 70 dB Approxlmltlly 4,.." w... of the clllCOrllDo of MacArthur Boulevard. 9S.f'eet IOU1h of the ccaterUne of Broadmoor Boulevlni, l2-feet ahove 8J'Ide. ApproxllUllly 2,..taet "'"' of the oenterltae of MacArdnlr Boulevard. 225-fitel101&th of the centerliDe of81'01dmoor Boulevard, flve-feet above UId.. · Calcul_d,frowt l.s-mi",* L.,' qJJ;.tfi'om mtmllDr L2 MI 51 1-'dB* A future traffie analYli. wu not provided for this project. However, we have usumed a 2S-peroent increase in the future averaae daily volumes. This change would correlate to an increue in the DNL of approximately I dB. The MacArthur Boulevard/Foothill Boulevard exit ramps &om 1-'80 are visible from the south end of the site. To quantify the contribution oft-S80 to the overall noise environment, we used the Federal Hiprway AdnUniltnltion'. (FHW A) Traffic Nail. Modol (TNM) FHW A-RD-77-108. The purpole of the model I. to quantiiY the noise levels at the setback ofth. propoud buildin.. I. they relate to the land-use compatibl1lty. From revicwina aerial photography, the neareJt ICItblCk of the project ftontina 1-580 to the cut i. approxhn.toly 77S-foet. Baed on the PHW A TNM, townbomes nearelt 1-'80 are exposed to an existiq DNL of68 dB. From the California Depanment ofTrIIlJportation Annual A verap Dally Truck Traffic countl manual, we understand that trucks are not allowed on 1-580 whe~ it pUICIJ the project lite. At the proposed. project setbacks and takina into agcount acoustical shielding from other project buildlnp. the DNL at the project site would range from 71 dB to SS dB. AlIUlMINT or NOIII Inw10r NoLJ. Levell To achieve me City and State interior noise requirement ofDNL 45 dB or below, sound- rated exterior windows and door uaemblies would be required. 6 L~ - TbI equivaleallVtllP DOlle level over I Jive time pIriod. laG......r """81" Fmlcl_ OIll1lm'- .41D. TII~ 418 U7 044. Fa; 411 ." 04t4 _.c_ItIr.","