1505 W CASINO RD 2016-01-01 MF Import

� ; '�� � � F . �� . �� N � Mr . Larry McCauley o y May 19, 1989 i Page Thr ee p�g i ,��,,y� The Fede[al Hiqhway Administration noise barrier model was used to � ��y� compute the bacrier height necessary to achieve 60 dHA at a first � � story el.evation for a receiver at the north face of thc � norti;er.nmost buildings which are closest to SR 526. The computed o� barrie:r height is 11 feet . The barrier should extend along the entire nocth p�operty line, i and should continue along the east and west propecty lines to a point 10 feet soukh of the north faces of existing two-stocy I apactment buildings which adjoin the project site. The ba[cier should weigh at least 4 pounds pec square foot and � have no gaps oc openings, including along the ground. Acceptable 'I �� matecials include wood, masonry oc conccete . iI ! With the noise barrier, the interior �ound level [equirement of 95 � C� dBA can be met at the first story location, even with windows I paitially open for ventilation. The interior sound level would then be 45 dBA, based on 60 dBA exterior minus 15 dBA �� outside-to-inside noise ceduction with windows partially open, I �1�' Second stocies of the four buildings closest to SR 526 would, I howevee, requi:e closed windows to achieve 45 deA interior , since the exterior noise at the second story wouLd be above Leq � � 60 dBA. Forced-aic ventilation is therefore recommended for these � �1' units, so that windows can be kept closed. � �. ,� The interior sound level requirement can be met using conventional , windows, except at the second-story north, west and east fa��s of the two buildings closest to SR 526. At these units, an in .ulated window with 5/16 inch glass, 7/16 inch aic space, and 1/4 inch I glass for an overall thickness of 1 inch is recommended to gel i from about 72 dBA exterior to 45 deA interior . ', i Towne, Richards & Chaudiere, Inc. '