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Subtitle A—Office of the Secretory <br />shall be evaluated to determine its ef. <br />fectivene:Ss• and impact on design and <br />aesthetic quality. circulation and <br />other environmental factors. <br />APPENDIX— DEFINITION or AcousTICAL <br />QIIANTITIE5 <br />I. Sound Level. The quantity in decibels <br />measured will) an instrument satisfying re- <br />quirements of American National Standard <br />Specification for Type I Sound Level Meters <br />SIA -1971. Vast 1111'w—averaging and A -Ire. <br />quency weiglaing arc to be used. unless <br />others are specified. The sound level meter <br />Appendix <br />with the A-weigill.int; is progressively less <br />sensitive to sounris of frequency below 1.000 <br />hertz. (cycles per second), somewhat as is <br />the ear. With frust time averaging the sound <br />level meter responds particularly to recent <br />sounds almost as quickly as does the ear in <br />Judging the loudness of a sound. <br />2. Average Sound level. Average sound <br />level. in decibels, is file level of the mean. <br />square A -weighted sound pre.sw►re during <br />the stated time period, with reference to tilt. <br />square of the standard reference sound <br />pressure of 20 rnicropasc:tls. <br />Day -night avoral;e sound level, abbruviat <br />ed as DNL, and symbolized mathematically <br />as 1". is defined as: <br />•rr0 <br />rILA(t)�ICt I'lu <br />run 1p G01•(:V `/ 10 <br />6000 <br />aj06 <br />L/,t.l C)/]0 <br />,0. 10 tt. <br />L <br />Tont. t is nl seconds. so tilt, limil.s shown ih <br />hours and minutes arc actually ihlt.rprelcd <br />Ill s v eller 1.,,41., 1:: till' little varyllig vaille Irl <br />A weil:ntoo SU111U1 11•t•el, Ille g11:tlll.li5. In <br />drrihr•Is nwasured by :ill ilititrun►enl salisf.V <br />n: re•luirr 11vilt:, of American National <br />-� <br />;:urr):u'rl !;pec ilic:diole for Typo 1 sound <br />I:r tel M11c Ir IA 1971. <br />3. l.,•,rd hnpulstrc Sul,nds, When loud inl- <br />pulsite sounds such W1 sonle booms or explo <br />siotts arc :00161)alr•d rorllributo►:s to tilt. <br />nr.isc envirojiment A a site. tilt- varll.ribu- <br />lion to o.tv night :rtrrage sound level pro- <br />durrd Ivy "It' loud t►npulsle ' sounds shall <br />\ <br />filly it is. ibt. I: :ru;lr rl lu it in :Isse•ssillm the <br />�. <br />`:1r>.rplan,hly •,: a :;llv. <br />A <br />A loud unpnl:.no ..11urld <br />i defined for the• <br />plt.,I: ea 1 1 Illi:, r,•t•I:I:ltion as oil(. for which: <br />ci- 7'bo ::01110 i•; dctinable us a disert.te <br />etc nt tvht. n In t he sound level Increases to a <br />m;t.xi+ulna ::ud 111041 decreases in a total time <br />1:•, :ni 111 approxinlalely one second or leas <br />;t.t. the :unb:eerl background level that exists <br />Q) <br />without Ihc• sound: and <br />j,h <br />Inaxlnll►fit sound level (obtained <br />lmi. and A- weighting of <br />;d✓^��' <br />1 11:1, a to : meter whose character - <br />.,,:It ANSI SI+1971) exceeds <br />t <br />ua Wild le tr! plior to the onset ­of —the <br />hv1 111 by ai 1< L l G eli iikigs_, itnd <br />(ill) Ibe mrxf►llunl sound level obtained <br />with fast averaging tittle of a sound level <br />meter exceeds I.hr- maximum value obtained <br />will) slow averaging time by at. least 4 deef- <br />bt Is. <br />�I.Oe <br />IL(t )•! <br />A <br />1 0 t! t <br />a 100 <br />PART 52 --IMPLEMENTATION OF <br />OMB CIRCULAR NO. A- 95 <br />Subpart A—Gonural Provisions <br />Sec. <br />52.1 Scope and applicability. <br />.5'S.2 Ut.►ilut ion.. <br />52.3 1{rsponsibllitus I. r:•,Ilnuustratioll. <br />Subpart B—Proiucl Notification and Rgvi*W <br />Procedures <br />82.100 Goncl'at. <br />52.101 Ite quh'elocnL•; alrphrrthle to .111 ifUD <br />grog r hills. <br />52.102 flousil,t: program.%. <br />52.103 Community Development 11ioc•k <br />Grants. <br />52.104 Freeslandint: Ilousinl; Assistance <br />Plans. (ReservedI <br />52.105 Assistance for new conn,, ollitio.s. <br />52.106 Comprehensive IjI:uxling :ls: ist:uu'c <br />62.107 National flood insurance prorrant. <br />52.108 Federal Disaster Assistance 1,::, <br />gram. <br />52.106 Areawide liousirlg Opportunity <br />Plans. <br />Subpart C--Oth*r Circular Raquir*moMs <br />52.200 Direct Federal I)cvelopinent. Me. <br />served) <br />52.201 State plans. <br />229 �l a �e / �/ - Y •7. <br />