Document aJ5rYz5Bj96Dv8rRvV8eZmLVa

FILE NAME: Todd Shipyards (TODD) DATE: 1974 June 13 DOC#: TODD011 DOCUMENT DESCRIPTION: Internal Report with Cover Sheet from 1978 FROM: TODD SHIPYARDS CORPORATION LOS ANGEIES DIVISION RAY COURTOIS DATE 7-24-78 TO: Cliff .Tones \ \ ENGINEERING CO., I N C . EXECUTIVE CENTER BUILDING .1755 BROADWAY - O A KLAN D, CA 94612 ! T E L E P H O N E AREA 415 4 5 2 - 3 9 7 0 OR 4 6 5 - 0 6 4 4 i I TODD SHIPYARD CORPORATION LOS ANGELES DIVISION ASBESTOS FIBER SAMPLING J - 669-1 Frederiksen Engineering Co., Inc* Tishrdan Airport Center 6151 W. Century Blvd. Los Angeles, Ca. June 13, 1974 \ TODD SHIPYARD CORPORATION LOS ANGELES DIVISION ASBESTOS FIBER SAMPLING Frederiksen Engineering was engaged by Todd Shipyard Corporation to monitor concentrations of airborne asbestos'particles at their Los Angeles shipyard. In accordance with Todd Purchase Order LA 27790, monitoring was undertaken to provide data for compliance with the Occupational Health and Safety Standards, 29 CFR 1910.93a "Asbestos." Monitoring took place May 22, 1974, in the Joiner Shop (6-samples) and the Hull Area (2-samples). SUMMARY OF RESULTS With the exception of one sample taken aboard ship, the results indicate that the concentrations of airborne asbestos fibers are within the current quantities allowed for ceiling or short-time concentration by OSHA standards. All samples indicate concentrations of airborne asbestos fibers are within the current quanti ties allowed for eight-hour exposures allowed. Complete results are tabulated at the end of this report. DISCUSSION OF RESULTS OSHA standards (29 C F R 1910.93a Asbestos) provide that no employee may be exposed at any time to airborne concentrations of asbestos fibers in excess of 10 fibers, longer than 5 micrometers, per cubic centimeter of air or more than . 5 fibers per cubic centimeter on an 8-hour time-weighted average airborne concen tration basis. T h e standards change as of July 1, 1976, to decrease the 8-hour TODD SHIPYARD CORPORATION LOS ANGELES DIVISION iJi..^lLLu;w ASBESTOS FIBER SAMPLING F red erik sen E n gin eerin g was engaged by Todd Shipyard C orporation to m on itor con cen tration s of a irb o rn e a sb esto s p a rticles at th eir L os A n geles shipyard*' In accord an ce w ith Todd P u rch a se O rder LA 25336, m onitoring was undertaken to p rovid e data fo r com p lian ce w ith the occupational health and safety stan d ard s, 29 CFR 1 9 1 0 .9 3 a " A sb estos. n M onitoring took p la c e N ovem ber 14, 1973, in the Joiner Shop (3 -sa m p le s), the Hull 100 A rea (2 -sa m p les), and the Pipe Shop (1-sam ple). SUMMARY OF RESULTS W ith the ex cep tio n of the gasket cutting operation, sam p le re su lts indicate that the concentration of airborne a sb esto s fib ers is in e x c e ss of the quantity allow ed fo r ceilin g or sh o rt-tim e concentration by OSHA standards. C ontrol of fiber em itted or p erson n el protection w ill be required. C om plete re su lts a r e tabulated at the end of this report. DISCUSSION OF RESULTS OSHA standards (29 CFR 1910. 93a A sb estos) provide that no em ployee m ay be exposed at any tim e to airborne concentrations of a sb esto s fib ers in e x c e ss of Todd Shipyard C orp oration June 13, 1974 J-69-1 time weighted average to 2 fibers longer than 5 micrometers. The sampling method used does not specifically determine the ceiling concentration but does determine a very short time concentration. By sampling immediately before, during and after the generation of airborne particles, an indication of ceiling concentrations is obtained. ' Test results indicate that the ceiling or short-time- concentrations we re exceeded during .one sample period, while cutting took place aboard s h i p . The other sample taken aboard ship indicates that compliance with the ceiling or short-time concentra-.. tions can be achieved using your existing method* The use of a hand-held suction device aboard ship does not provide consistent control. The difference in results points out the need for more positive control than currently exists aboard ship. A shroud system should be made to fit the drill and sabre saw in order, to capture the dust from the cutting operations before it has a chance to escape into the air. Consideration should also be given to the collection of asbestos dust on the side o f .the material opposite the drill or saw. Such a system of dust collection w o u l d lower the total asbestos in the hull and would also tend to minimize the peak concentrations. All other stations sampled indicate compliance with the OSHA standards for both' eight-hour and short-time or ceiling concentrations. V- RSCOMMENDATIONS*i The engineering solutions you have used in the joiner shop have been successful in controlling airborne asbestos particles. The use of shrouds or shields on board ship should result in complete compliance there. TEST METHOD All testing was done in accordance with the standards outlined in OSHA Standard 29CFR 1910.93a Paragraph e. i Air from the breathing zone of an employee was drawn at 2.04 liter/minute through a millipore filter during and after the asbestos or marinite cutting operation. After 15 minutes, the air flow was shut off'. The samples were analyzed using phase contrast illumination. i Todd Shipyard June 13* 1974 J-669-1 Corporation :.V ': ' * fe. r.^ ! ij :_j m m nm g IKS TODD SHIPYARD ASBESTOS MONITORING Sample Number Location'- Circumstances of Sample Number, of Fibers Exceeding 5 Micrometers in Length Actual No, Measured Predicted No. for 8-Hr. Per Under Actual W o r k i n g Cond, i . .. Joiner Shop - Panel Sari ; 1 11 * ft _ . .3. .^ .. , r. .. -- if . H * :. ..`11 * : *.. .V7 iSS^flp ;; 11 ;**v"'*:.; if i " .V. L':' / . "* ' 6. .'i :' Joiner Shop - Skill Saw 7. On Board - Drill/Sabre Saw 8. Il . If 0.5 Same . 1.6 it . 1.3 - 3.1 :. 11 . ...' -i;'; * II / - 0.6 ~ II ... l.o ft ..... 2 e ....: ... ' x.31 - 2 13.9 .91 Based on letter of November 15, 1973. In excess qf ceiling or short-time concentrations allowed by OSHA, f' 't \\-r ASBESTOS FIBER SAMPLING V -- .. * M-hi-:-'y : : . ^ - , - - _ i '' -? .. ? r ^de rilesen.'Engineering C o ., Inc. :; L T ish m a n A irp o rt C enter 6151 W. Century Blvd. `M a S E .... \ L o s A n g e le s, Ca. 90045 ^ D ec . 5, 1973 _ -1-;.- Todd S h ip yard C orporation. ;7T>h..'. . D scerab er 5, 1973 ... . J-669 ... ; '= - Irvine .- ,:_i ' .... a-..'";; \ l\i y c ?V. ' ' vvtf^lO fib e r s ,- lo n g er than 5 m ic r o m e te r s , p er cubic cen tim eter of a ir or m o re than 5 fib ers p er cubic cen tim eter on an 8-hour tim e-w eigh ted average airborne ;; V co n c e n tr a tio n b a s is . The sam pling m ethod used d oes.n ot sp ecifically determ ine the ceilin g conceti. tration but does determ ine a v ery short tim e concentration. By sam pling im m ediately before, .after and during the generation of airborne p a rticles, an . indication of ceiling concentrations is obtained. T est results, indicate that ceilin g coneentrations w ere d efinitely exceeded in the H ull 100 A rea and in the Join er Shop when no control w as u sed . The 8. 2 ..... : V . fib e r s .p e r cu b ic c e n tim e te r m e a s u r e d in the Joiaex* Shop w hen u sin g a saw . ' - . . - ^ a.vacuum attachm ent, in d icated that the upper lim it of 10 fib e rs w as probably, exceeded during the p erio d when actually cutting. rr.r- " " Hif ........ .......... " " " e .fiber concentration at the a sb esto s gasket.cutting operation w as v/ell below both the m axim um allow ab le and 8 hour exposure lim its. : TTjTl" T h e " r esu lts sh ow that a p e r s o n w it n e s s in g a m a r in ite cut in the J o in e r Shop or. en terin g the H ull A r e a of a sh ip w h e re m a r in ite has r e ce n tly -b e en cut prob ably has ex p o se d h im s e lf to a le v e l of a s b e s to s fib e r s g r e a te r than, a llo w ed b y the ... Tf.Z: I-standards. -- - ' . .. ....... Since the eightdiour.time-weighted average is only applicable w h e n the m a x i m u m ration is less than 10 fibers per cubic centimeter, controls or personnel ction m u s t be provided at all areas, except at the gasket cutting machine, ess_of the duration of exposure. -E- Todd Shipyard Corporation Decem ber 5 ,1 9 7 3 D:d- J-669 ................. -W . ! i^ V ' ^ i J -HHEBBaoKi B a s e s ts : ' ." '' ' .- ' _ : ....>.> ;V. ..'*f:. ./ /.** R EC O M M EN D A TIO N S X The OSHA stan d ard s a re su ch that th ere a re two .ways to m e e t the com p lian ce regu lation s. The fir s t is to control the fib ers at the sou rce using vacuum s, ventilation, and sp ec ia l tools or handling the a sb esto s fib ers w et. The second m ethod is to le t the fib ers get into the environm ent and con trol personnel ex p o su re by r e s p ir a to r s , sp e c ia l clothing, change r o o m s, lo c k e r s and m ed ical exam inations. The regulations sp ecify that the exposure lim its sh all not be achieved by the V~ u s e of r e s p ir a t o r s o r s h ift r o ta tio n ex c ep t during th e t im e of in sta lla tio n of : VD1. e n g in e e r in g c o n tr o ls and in s itu a tio n s w h e r e e n g in e e r in g c o n tr o ls a r e te c h n ic a lly in feasib le;or, fe a sib le to an extent that is in su fficien t to redu ce the concentrations below the p rescr ib e d .lim its. The key w ords are "technically infeasible" which Lcture h a v e not b een w e ll d efin ed . , ' i.. : : D We b elie v e that con trollin g airb orn e a sb esto s in the Join er Shop by engineering m ethods is tech n ica lly fea sib le; controlling the fib ers aboard the ship by engineering m ethods m ay be techn ically fea sib le. We b eliev e that a com bination of en gin eerin g and h ygien ic con trols could be developed to sa tisfy the OSHA requirem ents aboard ship. In the in terim .betw een now and the tim e engineering co n tro ls a re in stalled , w e recom m end the follow ing steps: 'J o in e r Shop ^ V / : L im it p erson n el entering the Joiner Shop to th o se with approved r e sp ir a to r s. $.kxr.Z. . V Todd Shipyard C orporation . ' D e c e m b e r . 5,1973 . , J-669 v .7 'll -`-.-Tv.. " ; ** ` .;- ' n t '.v^vi. 1 !-/ j: mmm r : ... f-:. -;: .^..-.=.. .: .................... . - ' :.. 2) P r o v id e s e p a r a te ch an ge f a c ilit ie s and c lo th e s a s r e q u ir e d . : ;;; .~ ';; . 3) In sta ll s e lf-c lo sin g d oors betw een Join er and P lan n er S hop s. 4) E lim in ate or p artition off the storage a rea in the Joiner Shop. 5) V acuum a sb e sto s p a r tic le s during cleanup. Hull A rea 1) L im it p e r so n n e l in room during m a rin ite in sta lla tio n to th o se with, r e s p ir a to r s . 2) V acu u m a s b e s t o s d ust .at each sh ift te r m in a tio n . rr~:F IN A L E N G IN E E R IN G SOLUTIONS ......P..e r m a n e n t d u st .c.o.ll.e c.t.io.n..s.y.st.e.m..s.h.ou.l.d.b.e..in.s.ta.l.le.d..on..a.ll.t o o ls .*1 D ust co llectio n sy stem should term inate in a baghouse m ounted "7" o u ts id e th e b u ild in g . 2) In sta ll m ec h a n ica l ven tilation system to draw in a ir from the o u tsid e and ven tilate. H ull A rea1) A c q u ir e p o r ta b le d u st c o lle c tio n s y s te m to b e p la c e d o n sh ip d u r in g m arin ite in stallation . Each tool should be connected to the vacuum ^ r . ..'* ._ s y s t e m . S y s te m sho.uld exh au st through a b a g h o u se to th e o u ts id e : ' of the ship. $4? T odd Shipyard Corp D ecem ber 5, 1973 J -069 V- 11 mmm 2) -TWP A cquire portable ventilation sy stem to exhaust at high volum e the air in the cabin w here m arin ite is being in stalled . Exhaust m ust be to the outside of the ship away from p ersonn el. TEST METHOD A ll testin g w as done in accordance with the standards outlined in OSHA Standard 29CFR 1910. 93a Paragraph e. * A ir from the breath ing zone of an em ployee w as drawn at 2. 04 lite r /m in u te through a m illip o r e filte r during and after the a sb esto s or m arin ite cutting operation. A fter 15 m in u tes, the air flow w as shut off. . : ./ .... . . .... ': :. . . ?. * ` ' ' v, . . . ' - - : ' ' T h e s a m p le s w e r e a n a ly ze d u sin g p h ase co n tr a st illu m in a tio n . AIR (XMAMINATION SURVEY OF ASBESTOS . TODD SHIPYARDS CORPORATION LOS ANGELES DIVISION PoOo BOX 231 SAN PEDRO, CALIFORNIA Prepared by: - EOY Eo NUTTER. ENGINEERING REPRESENTATIVE . . THE TRAVELERS INSURANCE COMPANY January ID, 1975 Distribution Oris* Mr. Co M. Liopincoit, General Manager TODD SHIPYARDS CORPORATION ' 1 CCS Mr. Ro H. Courtois, Dir. of Industrial Relations, Safety Engineer TODD SHIPYARDS CORPORATION 1 CCS Mr* Harry Fisher, Assistant Treasurer TODD SHIPYARDS CORPORATION ` Y YY 1 CCS Mr. C. E. Jones, Chief Engineer ... .* . / .... Safety and Compensation Control .v ' ' TODD SHIPYARDS'CORPORATION 1 CCS CORROON & BLACK COMPANY ; Y ' ""2 ccs Special Accounts Unit, Engineering Division, Home Office A. ?c: Western Regional ContactTHE TRAVELERS INSURANCE COMPANY . ' \ . ` v * V. ' Engineering, Seattle . ''t - " v TODD SHIPYARD ASBESTOS MONITORING . ... ' Sam ple N um ber T 2. 4y , % tx5 - v . - y ; - j 6. L ocation/C ircum stances of Sam ple . Num ber of F ibers Longer Than 5 M icrons per Cubic C en tim eter Predicted Tim e . W eighted 1*2 A ctual M easured A verage C oncentration Joiner S h op -sk ill saw w ith vacuum attachm ent 8. 2 operating l . O 123* : 'J o in e r Shop - s k i l l sa w 7 1 .8 . . N. A. Joiner Shop - panel saw 8 2 .8 N. A. Hull 100-- cargo o fficers quarters - variou s hand tools - Hull 100 - cargo o fficers q uarters - v a rio u s handr tools tw ice the num ber of operations as sam ple 4 - 2 2 .8 ' N .A . r * ; z ;n . a . ; - P ipe Shop m achine g a sk et cutting ; 0. 4 ... .y; ... 0 . 2 ............ (1) "-: P r e d ic te d e x p o su r e l e v e l is b a se d on p e r s o n n e l w o rk in g in the a s b e s t o s or m arlinite cutting a ctiv itie s for the tim e p eriods stated in Todd * : '.'.letterdated N ovem ber 15, 1973 P erso n n el would then not be exposed . , to work involving the handling of m arin ite panels or w orking w here airborne asb estos is p r e s e n t.` . * : (2) \ N. A; in d icates not a p p lica b le due to m axim u m con cen tration b ein g ex c e e d e d . (3) - T h is valu e m ay not be a p p lica b le sin ce m axim um con cen tration w as ~ probably exceeded during period of actual cutting. INTRODUCTION On'November 13, 1974, an Air Sampling Survey for Asbestos was conducted at Toddys San Pedro Shipyard. The survey was econducted at the request of Mr. Ray Courtois, Director of Industrial Insurance, Safety Engineer, J; for'the purpose of determining employee exposure levels. It was indicated .that there were two primary areas of concern; panel cutting in the Joiner Shop and installation aboard ship. It was further indicated that the shipboard activities consisted of short-, term intermittent work. . :V - ^ . II SUKMAET : Samples were taken in the joiner Shop to determine both peak and time-weighted average concentrations during the panel sawing operation. The employees x-rore personal respiratory protective .equipment during the actual sawing operation. The time-weighted average concentrations found were below the permissible limit, 5-^ however, the peak concentration exceeded the ceiling values. There was no hull activity, involving asbestos, on the day of our survey. To obtain some indication of concentrations aboard ship, these activities were simulated in the Joiner Shop. The simulations ' were judged by observers to generate higher concentrations of asbestos than was normal aboard ship. The concentrations `found were above the . permissible levels on a time-weighted average basis. The results for /the simulated drilling and knife cutting are below the ceiling .values, * ; but the concentration during saber-saw cutting was more than three times larger than the ceiling value. All of the results from the simulation indicate the need to sample during actual shipboard insulation. X U OCCLUSIONS and RECOMMENDATIONS v l*'- Asbestos Fiber Concentration :T.v"Y T During the actual cutting of panels in the Joiner Shop may be an excessive employee exposure. Personal protective equipment is worn.' " " 'T*' * * 2. Average Asbestos Fiber Concentration : . - The average asbestos fiber concentration in the Joiner Shop v;V ; (except during actual cutting) does not represent an excessive v employee exposure. TYT CGMCLUSIONS and RECOMI@?DATIONS (Cont'd.) 30 Asbestos giber Concentration During Simulated Saber^Saw Cutting ' Asbestos fiber concentration during simulated saber-saw cutting indicates an. excessive employee exposure# .. AsbestosFiber Concentration During Simulated Drilling Asbestos' fiber concentration during simulated drilling indicates possible excessive employee exposure# : 5 Asbestos Fiber Concentration During Simulated Knife Cutting Asbestos fiber concentration during simulated knive cutting .. indicates possible excessive'enployee exposure. ' HECOMMSNDATIONS 74^*1 To better establish employee exposure to asbestos, additional asbestos sampling should be done aboard ship during actual- ' installation activities# 7^-2 .To prevent excessive employee and public exposure to asbestos, the precautions outlined in Title 3 (California s General' Industry Safety Orders), Section 5203, should be met regarding the following: la Engineering controls* 2 Work practices (including disposal)# 3.i/ Respiratory protective equipment. 4*'JiChange rooms and special clothing# '. 5* :laundering. Monitoring and record keeping. 7o "Caution** signs# ... 3#~ "Cauticn,Mabelso ' 9o Medical examinations - ; > * v . . -4. 17.. DISCUSSION . 'Sampling The actual sampling time and data regarding the collection of the samples are given in the attached Industrial Hygiene Survey Data Sheet# In the column marked ^Sampler Position'1 the abbreviation ,,PM scBZ,f, are used# These stand for the position of the instrument and. the type of sample taken. ' . ' ET DISCUSSION (Cont'd.) 'Sampling - Continued: Th personal samples, designated by MP f, were" taken by attaching the rasmpling pump to the employees. These samples represent the Tv "average of what the employee is exposed to. The personal sample ::;^ I - S ^ g l i ' ( 5 0 9 D ) , taken during actual panel'cutting, was collected during'most ::: : r "*:of the- morning. This is a repetitive operation involving the same 7 7 7 7 3 7 setr-up9 'equipment, physical layout, etc#, and therefore, this sample ; Should give a good indication of what exposure exists for the entire '7.777 - -day or any other time duration# ;-7 ' . " '7 ' . ; ......... ' ..7777^77.77..^.... "BZ" samples were taken so as to approximate the peak exposures ^ 7 ^ y p ' 'il^^^;during short-term operations that were likely to effect the 7^ - .V. - 7 ' asbestos fiber concentration. ` 'i .r ^ `"77*7,*.7 *.t*"""* ............. : . ~ . " -. ..-r ->*- 7 . - ` ` * . .' : .* . ' - 2he "BZ" sample 495D was taken when the skill saw was actually being used to cut the panels# The sample was taken by holding the filter s close as practical (6 to 12 inches) from the saw operator's nose and mouth# Sampling was begun when the saw was started, and ceased -when the saw was stopped. Ne followed this procedure during the cutting of 15 panels (30 cuts)# Notice that the actual sampling time for these cuts was only 4 8 minutes* This is because we started and stopped our timing (using.a stop-watch) so as to record the actual sampling time. best :}' The three "BZ" samples taken during simulated knife cutting,- simulated drilling, and simulated saber-saw cutting were intended -to give some approximate indication of what conditions' were like Laboard ship. This samples were taken using a high-volume sampler .running at 8.9 IPM. This equipment was used because, we were not . ! sure of how low the concentration would be and wanted to guarantee that sufficient samples were collected for analysis. The normal p:sampling technique to evaluate peak levels of asbestos.is through the use of a 2.0 IPM flow rate. Since these were simulated conditions, we chose to reduce the sampling time needed to obtain V a significant sample, by using the higher flow rate. The sampler "position was an approximation of the breathing zone, however, the sampler was not moved as the operator* s position changed. 7 Analysis The laboratory analysis of the samples is given on the Industrial Hygiene Analysis Report. The sample numbers coincide' with the v Industrial Hygiene Survey Data Sheet. The. Test Results" column shows, the material tested for, and the calculated concentration in fibers per cubic centimeter. .. 7 . - 7 777^77-7 Cai/OSHA Standards, as provided in Title 8 of the California General |Administrative Code, Section 5208, of the General Industry Safety Orders explains the permissible levels of exposure to asbestos. This Section states: ` - 3 . ''t - " v TODD SHIPYARD ASBESTOS MONITORING . ... ' Sam ple N um ber T 2. 4y , % tx5 - v . - y ; - j 6. L ocation/C ircum stances of Sam ple . Num ber of F ibers Longer Than 5 M icrons per Cubic C en tim eter Predicted Tim e . W eighted 1*2 A ctual M easured A verage C oncentration Joiner S h op -sk ill saw w ith vacuum attachm ent 8. 2 operating l . O 123* : 'J o in e r Shop - s k i l l sa w 7 1 .8 . . N. A. Joiner Shop - panel saw 8 2 .8 N. A. Hull 100-- cargo o fficers quarters - variou s hand tools - Hull 100 - cargo o fficers q uarters - v a rio u s handr tools tw ice the num ber of operations as sam ple 4 - 2 2 .8 ' N .A . r * ; z ;n . a . ; - P ipe Shop m achine g a sk et cutting ; 0. 4 ... .y; ... 0 . 2 ............ (1) "-: P r e d ic te d e x p o su r e l e v e l is b a se d on p e r s o n n e l w o rk in g in the a s b e s t o s or m arlinite cutting a ctiv itie s for the tim e p eriods stated in Todd * : '.'.letterdated N ovem ber 15, 1973 P erso n n el would then not be exposed . , to work involving the handling of m arin ite panels or w orking w here airborne asb estos is p r e s e n t.` . * : (2) \ N. A; in d icates not a p p lica b le due to m axim u m con cen tration b ein g ex c e e d e d . (3) - T h is valu e m ay not be a p p lica b le sin ce m axim um con cen tration w as ~ probably exceeded during period of actual cutting. . V Todd Shipyard C orporation . ' D e c e m b e r . 5,1973 . , J-669 v .7 'll -`-.-Tv.. " ; ** ` .;- ' nt '.v^vi. 1 !-/ j: mmm r:... f - :.- ; : .^..-.=.. .: .................... . - ' :.. 2) P r o v id e s e p a r a te ch an ge f a c ilit ie s and c lo th e s a s r e q u ir e d . : ;;; .~ ';; . 3) In sta ll s e lf-c lo sin g d oors betw een Join er and P lan n er S hop s. 4) E lim in ate or p artition off the storage a rea in the Joiner Shop. 5) V acuum a sb e sto s p a r tic le s during cleanup. Hull A rea 1) L im it p e r so n n e l in room during m a rin ite in sta lla tio n to th o se with, r e s p ir a to r s . 2) V acu u m a s b e s t o s d ust .at each sh ift te r m in a tio n . rr~:F IN A L E N G IN E E R IN G SOLUTIONS ......P..e r m a n e n t d u st .c.o.ll.e c.t.io.n..s.y.st.e.m..s.h.ou.l.d.b.e..in.s.ta.l.le.d..on..a.ll.t o o ls .*1 D ust co llectio n sy stem should term inate in a baghouse m ounted "7" o u ts id e th e b u ild in g . 2) In sta ll m ec h a n ica l ven tilation system to draw in a ir from the o u tsid e and ven tilate. H ull A rea- 1) A c q u ir e p o r ta b le d u st c o lle c tio n s y s te m to b e p la c e d o n sh ip d u r in g m arin ite in stallation . Each tool should be connected to the vacuum ^ r . ..' * ._ s y s t e m . S y s te m sho.uld exh au st through a b a g h o u se to th e o u ts id e : ' of the ship. $4? Todd S h ip yard C orporation. ;7T>h..'. . D scerab er 5, 1973 ... . J-669 ... ; '= - Irvine .- ,:_i ' .... a-..'";; \ l\i y c ?V. ' ' vvtf^lO fib e r s ,- lo n g er than 5 m ic r o m e te r s , p er cubic cen tim eter of a ir or m o re than 5 fib ers p er cubic cen tim eter on an 8-hour tim e-w eigh ted average airborne ;; V co n c e n tr a tio n b a s is . The sam pling m ethod used d oes.n ot sp ecifically determ ine the ceilin g conceti. tration but does determ ine a v ery short tim e concentration. By sam pling im m ediately before, .after and during the generation of airborne p a rticles, an . indication of ceiling concentrations is obtained. T est results, indicate that ceilin g coneentrations w ere d efinitely exceeded in the H ull 100 A rea and in the Join er Shop when no control w as u sed . The 8. 2 ..... : V . fib e r s .p e r cu b ic c e n tim e te r m e a s u r e d in the Joiaex* Shop w hen u sin g a saw . ' - . . - ^ a.vacuum attachm ent, in d icated that the upper lim it of 10 fib e rs w as probably, exceeded during the p erio d when actually cutting. rr.r- " " Hif ........ .......... " " " e .fiber concentration at the a sb esto s gasket.cutting operation w as v/ell below both the m axim um allow ab le and 8 hour exposure lim its. : TTjTl" T h e " r esu lts sh ow that a p e r s o n w it n e s s in g a m a r in ite cut in the J o in e r Shop or. en terin g the H ull A r e a of a sh ip w h e re m a r in ite has r e ce n tly -b e en cut prob ably has ex p o se d h im s e lf to a le v e l of a s b e s to s fib e r s g r e a te r than, a llo w ed b y the ... Tf.Z: I-standards. -- - ' . .. ....... Since the eightdiour.time-weighted average is only applicable w h e n the m a x i m u m ration is less than 10 fibers per cubic centimeter, controls or personnel ction m u s t be provided at all areas, except at the gasket cutting machine, ess_of the duration of exposure. -E- i Todd Shipyard June 13* 1974 J-669-1 Corporation :.V ': ' * fe. r.^ ! ij :_j m m nm g IKS TODD SHIPYARD ASBESTOS MONITORING Sample Number Location'- Circumstances of Sample Number, of Fibers Exceeding 5 Micrometers in Length Actual No, Measured Predicted No. for 8-Hr. Per Under Actual W o r k i n g Cond, i . .. Joiner Shop - Panel Sari ; 1 11 * _ ..3..^ ..f,tr. .. -- if . H * :. ..`11 * : *.. .V7 iSS^flp ;; 11 ;**v"'*:.; if i " . V. L':' / . "* ' 6. .'i :' Joiner Shop - Skill Saw 7. On Board - Drill/Sabre Saw 8. Il . If 0.5 Same . 1.6 it . 1.3 - 3.1 :. 11 . ...' -i;'; * II / - 0.6 ~ II ... l.o ft ..... 2 e ....: ... ' x.31 - 2 13.9 .91 Based on letter of November 15, 1973. In excess qf ceiling or short-time concentrations allowed by OSHA, f' Todd Shipyard June 13, 1974 J-69-1 Corporation time weighted average to 2 fibers longer than 5 micrometers. The sampling method used does not specifically determine the ceiling concentration but does determine a very short time concentration. By sampling immediately before, during and after the generation of airborne particles, an indication of ceiling concentrations is obtained. ' Test results indicate that the ceiling or short-time- concentrations we re exceeded during .one sample period, while cutting took place aboard s h i p . The other sample taken aboard ship indicates that compliance with the ceiling or short-time concentra-.. tions can be achieved using your existing method* The use of a hand-held suction device aboard ship does not provide consistent control. The difference in results points out the need for more positive control than currently exists aboard ship. A shroud system should be made to fit the drill and sabre saw in order, to capture the dust from the cutting operations before it has a chance to escape into the air. Consideration should also be given to the collection of asbestos dust on the side o f .the material opposite the drill or saw. Such a system of dust collection w o u l d lower the total asbestos in the hull and would also tend to minimize the peak concentrations. All other stations sampled indicate compliance with the OSHA standards for both' eight-hour and short-time or ceiling concentrations.