Document 6brG8Xk2Vzza2oO4Rmn405L59

FILE NAME: General Dynamics (GED) DATE: 1964 Nov 17 DOC#: GED002 DOCUMENT DESCRIPTION: Letter - from Connecticut Dept of Health , . CONNECTICUT STATE DEPARTMENT OF HEALTH Occupational Health Motion Joseph J . Siapor, M* V * 0 Chief Sovcafcer 1?, 1985 General Dynamics Corporation Eleeirio. Boat Division . Sftstg'rn' Point load Groton, Connecticut Attention* Mr Harold J* M&rg Ohio Gantlemon* A study m s acts on Goto Joseph 1 Smolon t o _determine and other dusts to which war' The primary interest blocks and pipe oo * 0* S* Vance and.Mr* noentratlons o f asbestos sulatlon Department are exposed* butting o f various insulations It i s d lfflo s M to evallifto the exposure o f the workers due to the Variety o f o p o r a t i o i h k o a r r i o / b y each worker with considar&ble, vari ation o f die seminat and the difference in oejapositlons o f materials used* The iaSfSSlJrial hygiene threshold lim it for asbestos dust is 5 m illion particles per cubic foot o f a i r . The lim it for Kale, or calcium s ilic a te dust is SO m illion particles per cubic foot o f air* Dust concentrations found during bandsaw cu ttin g operations 0 the insulation barge on the wot docks wore very high and should be controlled* The fi r a t sample iras tafeen on the barga at the bandsaw which has no exhanst ven tilatio n . The ampia was oolleotsd in the broathing son o f the workor during outting o f Kalo Blocks. A oonoentratlon o f 288 m ilito -p artid a s o f duat por cutio foot o f a ir was found ia th is sampie* A aocond ampie waa tafeen dwrlng outting o f ffnSbeetos pipo oovarIngs on the .largo banda&vr loo&tod in the mal room on board the insul- ation hurgo* This saw w&s equipped with meohanioal- exhaust ventllation Ths oonoentration o f dust found ia th is sampie was 54*5 a illio n partiles por cutio foot o f air* ... / tm CA U A 1K EB-LUND-011344 General Dynamics Corporation Blootrio Boat Division -2 - Novamber 17, 1965 A th ird cample was co lle cte d during bandsaw cu ttin g o f both Kalo blocks and TTnibeetoa on the exhausted bandsaw lo ca te d .in the main ehop in the Maintenance Euilding in the South Yards The concentration o f dust was 5.4 m illio n p arti les per oubio fo o t o f a ir* The f i r s t two samples are considerably in excess o f the threshold lim it o f 5 m illion p a r tic le s per oubio foot o f a ir fo r asbestos dust* I t is roaommended th at moahanioal exhaust v e n tila tio n be provided fo r the two bandsaws without exhaust v e n tila tio n , located outside the small room on the in su lation barge* The e x is tin g , v e n tila tio n on the largo bandsaw inside the small room on the in su latio n barge should be improved to pro vide effectiv e pontrol o f the dust* The th ird sample in d icates th a t borderline concentrations o f dust r e s u lt from bandsaw c u ttin g operation in the main hop. Since the oper ations are in term itten t, control on th is u n it i s considered to be e ffe c tiv e Tfe sh a ll plan to continue working with you on th is problem u n til effective control is achieved. Sincerely yours, ALCtlg ooi Mr* J* T* Parker industrial Engineer A* Duncan MaoDougall, M*` D* Medical Director rfj-C- o Allan L* Coleman Chief Industrial Hygienist EB-LUND-011345