Document a45EKkKQ81GOY7OJd1qV0d4RX

li*r~io`~.Vi.iMi''i'^~*. LEAD INDUSTRIES ASSOCIATION, INC. 2 S MADISON AVfNUt NEW YORK* N. V. 10017 TtlSAMONC - AACA COOI Alt OA MOM 1 June 7, 1965 SUBJECT: Reprint on leadasbestos antivibration pads To Members cf the Lead Industrie* Association, Inc.: "ISOLATION OF RAIIRCAD/SU3KAY ROISE ATO VIBRATION" (reprint attached) appeared In the April, 19&5 issue of Progressive Architecture. It is based on Laymon Hiller's tali on vibration pads at the L1A annual meeting two years ago. Sot only 1* the material 6tlU valid, but it represents the only authoritative printed material on performance of the pads. The delay in publication has been largely due to the exhaustive treatment of the subject given in the article. Editors of all the najor architectural magazines vere approached shortly after the talk .a* vas given. None of them were willing to give the subject the amount of space required. Rather than settle for a vatered-dovn version, ve liave waited until the article could be reproduced in its entirety. These reprints are being mailed to our entire architects-builderscontractors list (approximately 12,000). You may obtain 2$ free copies for your own use or purchase additional copies in bulk at our cost of $Uo.OO per hundred. 'j Sincerely, - .1 BF:bd , Attachment J Ws a JU, 'Bruce Fader Manager, Technical Services - tt my* I. II<yy \ :# ip r> o *~ Q <-- cm <U "gwwjn >*<' uyfj.'.* '-if*' iill >y *wI.i^W Jlr*g.g .-. ;:r LI A23421 vofc ) -t-^ -,---~~~fc-rrt> ..W Isolation of RailroadlSubway Noise and Vibration BY LAYMON N. MIUXH AUk^itfk Irod-osS<Uoa pod* Lor* L*ro osrd to r+Jmft tfu tramjmittum of rnZ* food- mmj tubuoydadorrd twuc ond tiif*- tio*. tffktusol dot* o* tkrir octooi tfrc- tii*n*it hoi tx(H herd to <omt* by. Tit* rrloJurty rrrtol tlmdiet of tkii Li*d or* report'd bj *1rmb*r of Boit, Brrcufh. /v, Ac o u aUc i of CcmLriJ(+' .VJJ^ W .Yr* Kori, .V. t. BrpnouJ frvm PROGRESSIVE ARCHITECTURE. A/>r/ /WX for LliAD IXDL'STKIIiS ASSOCIATION, INC. 2**2 MjJi%on Avenue Nor York. N. Y. 10017 u t < w . \ ,<<. o> cm -- -> O < u --o w 6l N 1708.01  T^iha^fil ifr . ^w, A^uc ,- LIA23A22 t ifgjyivgLV LIA23423 Isolation of Railroad / Subway Noise and Vibration tlY I.AYMON N. MH.I.F.R Although /xidt Aoi*- txm mifJ to rrdurr tkt trontmiaion of toil. toad- and tubuoy indutrd Hour onJtihm- tion, trthnicol Auto ot\ ikrir ortool rfrr- lii-rnfAt Aai beet katd to <omr by. Tuo rctafiirly rrrrnt studin of tkit kind ore trf*ortrd by a memAer of Roll, Rrronfk S: YrKrtai, tnc^ AcoutUct ContullenU, of ('.ombrid/tr. *nd Xcw York, S. Y. In I he center ot a large tity there eta be hund a mtMe reinforced concrete truc> lure hooding an elite English ehinaware and fine gla*wtfe lop located In a plait* t)pe chopping area one floor below atrcct > --n nu< MU-lh >! 1 i i- LIA23424 L rZ^- t --.- ---------- level. Street traffic, including truck and bu**e*, pae* directly overload. There are few e*pan*i<n joint* aero** the r^d- way surface. Each time a tru<k or bu pa**c* over an expansion joint, I Ik * build ing u*tain* a slight bump. Sacral bun. dred bump* |*r day, however, arc enough to raue gla*sc* and dihe* to creep aero** (lie shelve*, (all to the door, and break. Groove* in the *helve. ledge* at the edge* of the shelve*, and antiskid *ur- 0 face* on the *hehe* now M>e the china and glassware. but the rtructure atilt hike* w ith every passing vehicle. In another city, a new building t* being constructed directly over an existing sub l way. The lowest door of the building i* to contain a large bank vault. Tlve safety and warning mechanism for the vault includes and vibration into the neighboring build ide-by.*ide isolated and uni*ola(ed build an Impact detection device that actuate* ing*. In fact, thi* bw been common prac ing column* luhh a* at I'nint* A and Bl an alarm in the event that an intruder tice in New York for alt new building* for train passage* ranging a* clow a* 17 hould *et off an explosive charge while along I'ark Avenue bordering the railroad ft and a far a* 220 (l from the column*. trying to get into the vault. Suppose a track* that run into Grand Central Nation. (Incidentally, cat h single dashed line , subway should trip the warning device? A cursory analytical inve-uigation of the actually represent* two rail* in the track ; Several movie theater* and a well-known effr<1 of ihe-e pad* i* not very encourag |wd. I S>ne typical vibration-level trace* concert hall are located clow enough to ing. however. It j* not clearly evident that for a train pa*-agr are shown (3). with railroad and subway track* o (hat a llw-e pad* ahicve five twdution claimed rj< h trace representing tl*e vibration coa- pa`ing train occasionally ma'k* the sound for them. V*ually. a conventional pad i* tept in the indicated freq'tcncy band. of the program being pre-enled. In the only alx>ut I in. thick, ha* (wo Vibration cau*-d by a (sassing train may center of onr . ity. a new library building thick layer* of a-lest,, fiber* separated al-* Ik * plotted to s Ih v w the general dis * ccn>truted directly over a buy ex t-y a ,,-iii.-thiek sheet of steel. and i* m- tribution of vibration levels a. function pressway. The jv-ace and quirt of the clo-wd in a waterproof jaket made up t*( of (lie frequency band* (4). Each point library reading room i> marred by an 1 v in. thi< k lead (I ). In a ty pi< al install* in thi- plot represent* the average vibra rational bump when a heavy truck lion. tin- pad i |cva<led at al*>ul S'*! to 10"0 tion level in a given frequent y band for a pasw* over a concrete expansion joint in p*i. U he one eon-iJer* tlie*e highly (articular pa**agr of a trxin. In thi* the foadwav Iw-neath. In office and apartmerit building* built over uh**ay and rai!r<>ad track*, vibration from passing pressed pad*, only 1-in. t!uk. -r>e would hardly think of tfiem a* tcib-nt pads. e*Je ijlK at low frequencies. \nd yet. graph, the vibrathm i* rerwfded from an uni-*litrd pi. V-up (i<nt at Prosit ion C. (2). 1 hat p.ml wa* srl--<te<| in older to learn 0 train* can frequently be /c/r a- high as long-time u*e f thew pads ha* built up an something alxtut tin- vibratbin produced If) to f0 ft t!*ve trak level, and nniw impressive group of people *d'*alitig by train* pa*mg over vsitch joint*. The can le heard a- high a* (O to 10" ft above their uw. even though tr* hni al data on resulting levels are wvefal deei|*rl* higher track level if nothing i* done to prevent their efle* tivene** ha* not ln*-n available. than for . i.nvcnlional track section* with noiw and vibration tran*mi-si*n. In one New York uffi e. it i* |v**ililf to bear passing atibway train* over a vertical dis Opportunity in Montreal For several year*, our firm and probably out -wit* 1k -. In addition. Ieia*e of the pre*-ncr of turvrd tra.k in thi* array. s.,mc "wheel were al-o recorded. tance of 80 ft. many ar hiir< tural. structural. and me. kibrali<m produced at track le^el may Thew illustrations typify the *ubway ibanbal engineering firm*- fia* Iern in fr* i arrted by multiple earth and struc and railroad noi*e/vihration problem* terested in having actual data on the ture path* into a nearby building.*\X ithin that have frequently been encountered vibration frJurtion provided by lead- die building, the vibration roay manife-t during tlie p*t few year*. Once a building a'l*est* pad*. In February wurkmg itwlf to an observer in rither of two wayw. ha* been eret ted. it is too late to lake any for l.M. IVi A A***w iate*. we were given U lien a c.iiumn. f*eam. concrete slab, or simple remedial st-p* t i*late the entire an o|q*rt unify to niea*ure ar installation wall of a building vibrate* doe tn the paw- *trulurr against intruding vibrathm. in an existing building. The railroad- sage of a ncatby train r subway, it radi Similarly, once track i laid it may ! too induced vibration level* in Montreal** ate* sound that i an Ik * beard; and if ft late to make lra<k change*; and it wvsuid Queen f.li/afwth ffotel (mounted *n bad- vibrate* with *uffixent intrn*rty, it pro irrtainly involve great expense and pub adM-sto* pad*) were measured and then duces vibtation that can It felt. It i* im- lic inc< iivenirnt e to inenrporale !<1atedly compared with five vibration level* in a (oilatit to realire that tlie radiated sound any significant vibration isolation treat nuni*olatrd three-floor. So ft high concrete d a vibrating Mruttuie can be beard at ment* in the trad layuut. strm lure-the Drtftr*tci Street bridge in bwer intensities ,,f vibration than can be tsaJ'Aibfsfox Vads (rorl of the Queen I.lizal-rth lintel. Both felt. It i* alwi important to rrallre that nf the-* strurturr* are (<h atrd dirertly for earch-U.rne and *tiu Cufe-borne vibra* For many years, b-ad asbcslo* pad* have over a Urge array nf depressed tiaik* of ti-n. the biw-frequen-y vibration i tfana- been plaed under the base* <( nearby the Central Station <*f the Canadian milled quite well, but higher frequency building column' to retime iltr tran-mis- National Kailwayi (2). It wa* (>o*ible vibration I* more easily al>sorled within ion of railroad - amt *iibw ay indu* cd noi-e to measure vibration simultaneously in tfie trm ture and i' n<< a* well transmitted. 2(M XfaUnafi and Armc tv*a r/\ 111 '.'WO LIA23A25 \r a ;;;;,, rr-. -- :1 w*-***- "P?" 1 LIA23426 "w ^y^'iwj**s*r LIA2 342 7 T 3 i Thu*. railroad* and *uh*av lypicatly pad* u*ed under the Queen Eliu-hfth (he paaaage of ubway train* that would produce !*-frequency rumbling toundv Hiftrl. normally not be pi* ked up by the h; .o j q when heard inide nearby building* that lla-ed on the enrounfinK revult* ob- ear, even In a very quiet enrirunrneot. are ronnecled by tlim total path* lo the tainr-1 flora the vibrali-m Ivuliliun te*t Knowing (he amount of five (rueturaj uilm<4 irf uUi) irirVi, on the Queen Kliaalwth Hotel, certain vibration, it wax po*ible ( make a* N*rne of ihr mullii'lr rtrih mj umc jM.rtion- of the rvc lh->al Bank of Can- approximate eabulathm of tbe amount ture path* from the train Jr*. I* op into a.la Building, rod otlter *maller build uf noi*e that would lc radiated by that tlie yrrn KlieaLrtb mil ihr !K>r- ing* in tlu- ame Blacc Villa Marie vibrating atrudure. A1*o compared wera hr*<rr ^krert Bridge are augge-ted (5). llrvrlopmrnt (all lo* ated over oc nearly live noi-e and vibration lorla with level* The i-oljtetl and rtniw.lafed column* over the array of track* between the that had been prrvWiutly- mea*ured i u*<*4 f<>r vibration meaniri-ftirnt* are a l*o Tunnel Kitr.me and tlic Ihjrthevtet thi* umr location before contruction of Hows. The actual detail of llx iuli* Street llriclprl have lent ivililnl with lincolo Center wa* Wguu. Other com- (ion joint of the hotel column* i* touch |ead a-l*e-*t** pad* and the rc*ult* have pari-nn could l>e made with level* meas (&<>rr complex than inJiulrd in thi* l*cen (Utihinf. Hcccnfly. ihe wriler wa ured in Carnegie Hall, where aubvray *Veth, breauv all the underground por in one of tfie new liuildirifi (wo flour noi-e ran be Iteard la certain locations. tion of tbe column Ur mu-t al*o he level* directly al*o*e (He two track* that Tlie fr)alh>n*hip of I'hilhanDunie Kali projected again-t earth-home pick-up. emerge from the tunnel; even though lo (be >ubay tunnel 1* hows (8). The The dtflrrcme between the vibration it vi at live time of (he early morning nearest track in ihj tunnel la about S6 ft level* to the bridge and in the Wei commuting per*d, be va not able to from the comer of Philharmonic Hall Column* (or the low-frequency hand hear c*r feel any pa*-ing traiov The and about ISO ft from the Reamt Inaide 20-7S epa dTp* pl*ttcd (f). TV*< Icrrli architect ha- rr|**nol thi* to le a highly -eating area of (lie Hall. There are lour rrr terorded for column ju-t uti-fi.tofv in-tallation. trad* in the tunnel: l*u for local aub- a (r* (xt rUr track elevation. Note that thi* plot include* a train pa**age Philharmonic flail Study way* and two for etpre** aubwgys. A* one local i* (lowing dnwtx, another la fof each }*>*int on the graph. and that New ^ork' new BhiUvarrnonk Hall i -l*erding up a* H [Uv-e* be*ide rhi>- train* ere mrJcJ for several differ another buiMing that ha- |een lv..lated harmouie Hall; the eiprr-*e* pa*a ent di-tan.-* from the piV-up J.*alions again-t -ubwavindu. -d n**t-e and vibra through at normal j>eed. During evening Th** difference **hie- are an indi. a5iv} tion. (hie cd the de-i^n rr.piir-nienta o(vef4ti.ns a train pa--e* by on each of toe rffn tjvene-- <<f the jviUli<>fi j.iiol*, wa- "There mu-t l*e nu -ubway noi-e track a)>ort every four or five minutea. although ffn--e value- pr.-buMi al-o in- in-ole the llall!" Thi* M-rved a* a guid A large numler of mea-urement povi- * lufe Mw etfcl- of irfhrf difference* ing principle in the design d the -true- tn*n- were located within tlie dotted - -u h a- pcomdrv and -fru ture--he. lure .f f)e boi'ding. The ha-iv deign region of tlie buildings ranging lo ele toeen the two building-. \n intr-rc-ting fcaiure- cn< or{.ra!. J into the building vation from t!e lia-em-nt (which i* effr.t .|.-n i. ihjt tlie i^dati-n joint to . ..nff.d earth lecrte and tru lure- at al-cijt the elevation of the tubway mu* to le niofr effr, ti\r f.*r tie- larger |-.fjie M,|.v. iv nw-<' and vibration in- trjck*) to iq elevation one floor above Horizontal di-tan. - than for the -letter . b.ded: tit (he u-r of ]ead-a*l<--lu* the u/clw-tra floor wrating area. Tbe or- di -tah* e* l-t * erfl th- ti am tr*. V and ll*e vibration i-.datv.^i pad- under all rob chrtfj fbner i alxui! IS ft aUoe *ubway ii'l'ittm involved Thi- i a ud-r <.m- i.inn. c.f tlie i.i'iMing: c|>i tin- ir-enion tra<k ele*4ti*/n. More than 1*0 p*-*iug plex pln-n.-menon that mil lr related in d vibration i-*(aiH^i piiru* in many <d -ubway* were recorded; mo-l of the-e mw n to tin* relative amount* -d ver the e\trti*ir and interior wall- and parti- were rc-.*cfd-d (imubaneiHi-]*- at two or tical and h.ftronlal vil.riti.Hi in the earth ti*n* at tf near the ba-enynt level; and llir-v different j*c**i(Hn*. e! in. r*a-ing di-tn. e- from the track, li i the ti-e of a "re-iln-nt"* lining ron- The location* and tf*e vibration leveU and to tf*e relative i-M.lati<.n eapabilitv -I'.ting of fli--fiUr pad- and vi.linl, in the 7.V150 p* frequm. v band fur IS d lh<- Jcad j-lw-t..* pad- for vcfti- al and graded. < ru-lw-d -tone atocind all under- of th- mea-urement i-.-itioni in the h>r:/nljl ri^npiienl* of vibration. ground rxteti-*r wall- **n live north and building proper, but coit-ide the audito !>atj ** obtained (7) from a floc ea-t -ide- id the billeting f< ing the rium area, are indb jted (Q). Note that that i irfie floor alir the lr*< k* fat -nbwav. for mo-t j*oition, vertical and Iwtriam* cb-**t*.*n 'f.' ft. a), 71ii* pla pr.dubly Kv.avation work al tlw vite of I*1iib lal diie-ticmal component* of vibration rrprc-4-nt* a more reali-tic pi. tore of (he harmonic Hall wa- -ljitr,| in IV.Vl, and are -howR. Hie oumlwr* *hown .In the effe-1 of o.lumn jo.ljti.m. Ie<*u-e the bv OdolM-r 1`Mil tlw ba-w *nre|e c ire le* are tlu- median value* olHaincd mca-ufefwnf |**-ttion in. bob- a <<>m- frame of the building wav e--entiaily from M**eral *ubwav ju--age*. for tbe-e |*<\ile loilf-.tion of -evrral J.-il-le I*r- compl- ted. At that time, a -ubway vibra te-ts tlie vibration level* arc given In irofital and vetth at path* Iwtween flte tion nna-urrment program wa* carried Jcvilirl* aUvc 10 *g arctlrtithn. The train trail.- and the mra*urcmcn( |-b out at (he budding to determine the interpretation of tbr*e level* will Dot be linv In the fre.]tien< y hand* of 2d l* effei tivrne-- of the til<n<i. j*a*laton di-cu-wd at this time. iUKl rp-. the vibration level* in the dr-ign*. At the time the-<- mea-uremenf* The location* and the vi|>ratlon level* i-4ilaled -Irmture are aUmt f* to 12 db were made, the rt(eriT gfa-- wall- of in the /5-IS0ep frrqurncy band fr fire lower than in the tlni-olated -tincture. tlie building, many of the inferior parti- rnea-uremenf (K.-iij.-n* in-ijr ut near the Average t'utuc of Isolation tii-n- of the huitdiug-. and live rbor- cd main hall are al-o *lrown (10). Pndtion the main hall were not ir-talled. Thu*, 17 wa* in (be *(age area. r*i'iti<in 18 wa* Ba-ed on thi* and other Mippnling data it wa- not jw-- tide l achieve a wufh- at a jicuted conc rete wall near the edge front the Montreal te-1-, al*ut R db ha* cienllv b.wr ha.kgtc-und noi-e level in-ic(e of the main hail (thi* will 1* encloved tentative!) |iern a--lulled a- tlw avenue the lull to even rV{>e.t to hear *ubway by anothrr interior wall in the completed value of b.v* frepirn, v i-ibilion that wa* r'|-e. However, with vibration nvea-ute- hall), and I'odtion 19 wa* tn the for l< hinnl bt the lift, thi* k Joda-W-to* ment rcpiipmetct. it wa- j-o--ible to detrui ward part of the or.hr-tra floor (eating Atait i**i r/g /udu/ion of RttUroaJ/^uhtnj .Voiir ana l ihrarian 2QT V. I arc*. representative of tho*e wot* near lb l 1j db ha* i*eeti tentatively assigned enl* only l*rr# building* out / hundred* est tlx subway. for the low-frequency vibration frdtutiofl that have lwen >0 isolated. T`e (eel that Tlve measured ttjhway vibration level* at Position 19 in the aeating arc* nearru the subway are plotted * (unction <bievcd with tlx isolation measure* taken In the Phdliarmonle Hall ties Ign. The t-vbkne** of tlx lead abcto* pad* we must mnlinue to be eoneratie In design* Involving complete building laoUtion untit there iv mote data on actual o( frequency (b-wcr abided area, 11). varied from 3 In. for tlx column* nearest field ln*tallalUnv Therefore, a con*rrvaThrse level* are al*ut 10 db Ixlow (be the vuhuay lo alwi *7 in. lor (he mrl live ue ol the data prewnted here U "vibration criterion** level* that were wt (or the Hall. Thia mean* that pawing luhway* rtnM ix heard iniJe |hr main remote column*, tapering down tn *.* in. to \*i In. *trp*eath 30 ft further removed from the subway. (The thhker dimen urged. TIk ro. wifaging re*utla found lo date, however, offer a prutniae (or noiae f hall, even during (hr quietest ambient Hui*e. at hm (hr orchestra may Us* pre paring (of recording K^iont Even though llxtr measurement! were made sion* were ahievrd b) Mat king together two pad* of t in. to I* j In. lhnkne*). In aJdition. the entire building wa* care fully designed and constructed to a**ure and vibration control In Urge building structure* located near railroads *ub* ways elevated railways turnpikes and exprrstways A* citie* become more nearly two yean ago before f'hilhirtnonc Hall wat opened, (hr data gave (hr assurance (h( tbr vibration level* were aatisfar torily low. that no rigid connection* would bridge the Isolation joint* and ahnrt-circwl the effrxljvrnes* of the pad*, la order to achieve the full capability of any Isola crowded and urban renewal project* re* pla<e outmoded areas there la an la* creased need (<x protevlive meaaurew againv the tatruaion of noise and vibra A pM of some earlier vibration level* obtained at Carnegie Hall (or nearby Snrtifh Avenue subway |U'*4(n it i Im vhuwn (II). Tlvese were definitely audi ble in*idc the hall. tion material, it i* alway* necessary that tion frra our viriou* transportation ay** careful attrntwut 1e given to these de tern* Suitable vibration iaolatioft desigo* tar!*. I*th in the design and in the ev ran {day an important rulr in ibi* prob- es utKNi of the design. . lea area. In reviewing the Montreal and the Lin- Earlier Sfeasurerr.enU at Site <ln Center wrk. no!** reduction value* s.f R. 10. and Ifi db have Iwen mentioned. One other significant mpari-on i* shown (12). In IV.VI, n establishment lnvn a- Harley's Hat occupied (he cor- U'hat do these value* mean in actual sit uation*? A (cw rrpre-wntaiive signal bangrs arc summarized av follow*. ner ( the present ite of Philharmonic Hall, near the TJe up{*rf haded area give* the vibration levels measured at a wall and a floor position tat A 2 'f 3 db change would lx jM noticeable, but would nt be large enough to imprest one by the change. For 4 serious noise nr vibration problem, in the )>4*ero*-nl of llirvev's Bar alwuit a 3 db reduction probably would o4 lx S.1 ft front tIk nearest ul<v.it track*. The lower shaded are* gives live range of vilwation levtU me*.urrd at bnir |*osj. tinv in the basement of I*hrlhamonie Hall, not more liin il>ut 6 to 10 ft from sufficient to lve the problem. (b) An fi to 10 dh change would he a significant f*-dulion and would represent a nmiietble improvement in the intrud ing nof-c that might ]*e beard in aa cfcinou/edgmcn/j the original measurements in Harvey** othce. restaurant, hotel.' hospital, apart Tkr uork 0/ the tfrouitiri coniu/rn( in i Bar. On the average, the situation levels ment. or retail *bop. Till* improvement rfie railroad and utwoy titration in the ba*ement position* of Philhar j> worth achieving. It could make an djpesft >} the tua major projeett de- monic Hall range *Uut IS to 30 db "intolerable*1 situation "tolerable** r a a rihrd rontJifrd 0/ eialuating the inten lower than thi*e fi.r the similar location "tolerable"* situation "acceptable.** In sity of the noise and nitration proUem in Harvey's Bar. The distance (< the >uh way trak is essentially the same for loch group* <( reading*, indicating that well-designed and executed installation o( lead-Asl'C'lo* pads, (hi* amount <( noie rrducthui can (*e achieved. Amrther and setting certain Lauc puidrlinet for the protection of the critieal parti of Ituildinft against the intrusion of nr***' the large improvement can J*r attributed wav of judging the effectiveness uf *uch and sitralion. The detailed noth of de to (Ik new construction. Not known is how much of thi* difference might l*e due to live more misi*e mni4ru<ii<>n of Philharmonic Hall; nevertheless, the col umn isolation joints, the wall isolation joint*, and the "resilient*' lining of the exterior underground walla all share la achieving the lower vibration level*. Summary an inta!lation i* illustrated by the fact that railroad r aubway noise heard 00 the second floor of an is-*!ted building, for example, wnutd probably lx heard all (he wav up to (he fourth nr fifth floor of an uni*oUted huilJtnf. (c) A 20 db change would be 4 dra matic change and would usually be ucient to eliminate vriou* nol*e or vibration problem. It U cautioned that a veloping the designs and incorporating them into the building strut turet ha* been the job of the architect1 and the rtrwcruraf rngineen. Archtfeiti for the Renal flank of Canada Building in Mont real include ffmry Cobh and Don Gor man of tM. Tri Atsoeiatet, fohi. Brett and Roger Sicolet of Brett Ouellette tllauer Associates, and Fred 5eterud of SricrudCfstad-Kruefer Associates', for Till* review present* only 4 brief *umtnary of the data obtained in the Phil harmonic Hall measurement program, but the re.*uh* do indicate a significant conventional in tallalion of lcad-|sbe>toa padv alone probably will not aehieve thi* amount of improvement, although it might be possible to attain thia with *pe- Philharmonic Hall, Dan Sella of Harri son & Abrammitz and Tyge Ifrtmansrn of Ammann : Fhiiney were instrumen tal in trorfcing out the actual isolation i reduction in aubway noise and vibration rial vibration isolation design* Involving designs, foe Tilney of Harrison A compared to what would have been ex- pad* plu* other iMtlation treatment*. Ahramacit: and A. } Alfio of Fuller- {cried for conventional construction. One other note of caution U that the Tumrt-B~alsh Slatter\ gate the essential From (hi* information, a value of almut quantitative data discussed Ixrc repre- rate and sup<n ision at the job site. JOB >1iutetials and Method* artL i*u r/a