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DEC-21-98 MON 15~50 <br />ARBUCKLE COSTIC aRCH INC <br />s <br />FAX N0, 5035813655 <br />,--- <br />P, 09/20 <br />July 21, 1998 <br />Consulmnts in ~cousrics <br />{KBUCKLE COS i ~ <br />Arbuckle Costic Architects <br />363 State St. <br />Salcm, OR 97301-3533 <br />Attentinn: Mr. I.,eonard I,odder <br />Re: Cuur.ct-ouse Syuare, Salem, OR <br />Bus Naise and Vibration Isolation <br />llcar Mr. Loddcr: <br />Proposal y8153 <br />This ietter is written to outline tasks and propose fees ta provide acoustical consulting services <br />for the refer.enced project. The project is.a commercial buiiding adjacent to a hus transfer mall <br />to be located in Salem, Oregon. The tasks of this project are understood to invo`.ve evaluating <br />the isolation and r.ecommending modificatians for controi of 1) bus noise from mall to the <br />interior bnilding spaces, and 2) bus vibration from the bus mall to d~e general building <br />structure. <br />The following tasks are expected. <br />A. SCOPE UF V~~ORK <br />1. Desigu <br />l.l Source Sound Measurement <br />For the most accurate analysis, sound level measurements of the bus noise should be <br />made. In that the sound isolating characteristics of building structure va~y with <br />frequency, chis information will allaw tlae most accurate evaluation of the currently <br />planned structure, and potentiai modifications. Measurement of bus noise for idle and <br />ac;ceteration would be made in octave bands from 31.5 Hz to 8000 Hz. <br />1.2 Analysis and Recommendations <br />JUL 2 9 19g8 <br />~FC~~=1V~r <br />1.2.1 Using die data of 1, a determination would be madc of the sound isolation requirements <br />of che exterior. wa(ls adjacent to die bus cransit mail. <br />