Document 7530Dwk4qLaqdrE2ErNOD61e

PLAINTIFF'S ~ EXHIBIT CHR-145 File Memo Trenton Chemical June 18, 1969 Subject: Follow-up Study - Friction Materials Building i-V ~r\ w* \ The ventilatioxr for the new Littleford mixera was eval uated and was found to be Inadequate at this time. The bypass damper for the mixers has not yet been installed and virtually no exhaust is provided at this time. A problem was observed when the automatic loading cart for these mixers is inverted. The top of this cart leaks at several points and some material escapes. The housekeeping in the area where these Littleford mixers are operated was very poor. This is a further indication that the veittHafeton* nontrot*!*- inadequate. It was dHfefr mended that this are be cleane# and the 491R|Jp3&empento& the mixes* be installed. After these changes have" been- * made, a study will be made to evaluate employee exposure to lead and asbestos on the mixer platform. Air samples should also be taken at the extruders and grinders. A new exhaust system i t<* be' lnstallf',ar'rth#fweigh-Op area vhate thecorts are loaded. This should provide considerably better control than the current system. A * down draft of 100 feet per minute into the loading carts will be provided with the newly designed system. The plans for this ventilation systemare to be submitted to this office prior to installation. hm cc: N. A. Trombley _><r f. . TO - S4MC S. C. nOM WAMC G. A. Enders Sattelmeier | i . lNn COMPANY CORMStOM&ka rice COM ""Mgr. , Friction OIVISIOM Mi terials Development Chemical oerr DlVIflON Industrial Hygiene Personnel ly 1, 1969 PiANT/oaricc Trenton Chemical rcANt/off icc Highland Park Special Industrial Hygiene Survey - Chemical Division, Friction Material Building On April 29, 1969, a study was made at the subject plant to evaluate the adequacy of the exhaust system proposed for handling brake lining materials containing lead litharge. The ventilation system was evaluated at the weigh-up carts where asbestos and the lead litharge is dumped dry into the transfer carts. A fide draft -hood 'aSWU^be lMtalled in .this area of the type discussed with Mr. E. Lombard at the time of the survey. A sufficient volume of air should be exhausted through this hoodjto provide a capture velocity of lOOfeetper minute. Sna "baffling ^Obeuld beinstailed topjtiHHttgnjglf^flrafts from the open doorway. dHtasxhaust yJPBPfficiaojay^toMjg^aild Ae provided at the scale where the ldKKSfill^isto be weighted. This system should also bedesigned for a capture velocity of 100 feet per minute. . The dp08S0BBKlatlon for the tifct&leford mixers should be Installed and operated as soon as possible. these (4H0WNe.3UMtailed ^iepiratora-ehould be provided for exposed employees. Th'e aS{MpFEW5Siation system for the laboratory grinders isjftflKSgruate. a sjdSsa should be-Kins tailed which captures tdnpSpB^oa and lead litharge dust at the grinders. G. A. Sattelmeier Industrial Hygienist cc: W. F. Bavinger R. F. Bowers M. F. Bruton, M. D. W. T. Diehl D. L. Eschelbach V. L. Knapp, M. D. E. R. Lombard F. E. Repucci N. A. Trombley MV. G. A. SatteLmeier FftOM *A Ml S. C. Enders INTER COMPANY CORRESPONDENCE Industrial Hygiene Personnel H *T U'VISlO* Fric. Mat'1. Oper._ Chemical lime; I % Highland Park Trenton SPECIAL INDUSTRIAL HYGIENE SURVEY - CHEMICAL DIVISION, FRICTION MATERIALS BUILDING______________________ The report on your April 29th study to evaluate the adequacy of the exhaust system proposed for handling brake lining materials containing lead litharge has been carefully reviewed. As a result, several changes are being made to improve the exhaust ventilation. At the .1 asbestos and lead litharge will be b carts, a be Installed with a 2* x 2' opening on the top . The 4BlKtier *eaacts srill SA be the and the 4mew Materials dumped into xhis opening. The capture velocity at the opening will be 100 feet per minute. A BSSKfiK^nd8dwith a capture velocity of 100 feet per minute will be installed at the area where the lead litharge will eventually be weighed. At the present time, 0 the litharge is being weighed on the mezzanine in the mixing S' area on a scale with a side draft hood. The litharge is dumped T> into the opening on top of the Littleford mixer. The two Littleford mixers in operation have exhaust ventilation installed as you have recommended. We are s'trudy the problem of providing improved ggvtustl,ventiiat40nTfor the laboratory grinders. 4tttfeec*rily we are cottmedftxig 'the grinders to their own separate dust abllectlon -system. This will give better control of the dust generated when grinding. n aa__ /o -b? ^ SCE/ss cc: W. F. Bavinger R. F. Bowers M. F. Bruton, M.D. w/ T. Diehl L. Eschelbach W. L. Knapp, M.D. E. R. Lombard FV . EA . --Re*pu' c*ci /O-'S'fc'V . -i/.c _ S. C. Enders, General Manager Friction Materials Operations File Memo Trenton Chemical Division June 25, 1969 Subject: Follow-up Survey - Friction Materials Building On June 24, 1969, a follow-up survey was conducted by the writer to supplement a survey^started on June 18, 1969. The Lodige-Littleford Mixer was not operating because of a mech anical failure of its automatic feed mechanism. T"*g had re4HH^ihaati7<lnstaIted in the new building and were not in production at this time. For these reasons we plan to reschedule a day to obtain samples of airborne asbestos and lead (litharge) dust in the above areas. tion system of the Lodige-Littleford Mixer is on order. Testing of the exhaust ventilation system of this machine with the extra opening blanked-off indicated that the exhaust ventilation may have to be increased after the damper is installed. Inward air velocity at the filling doors, opened four inches, ranged from 50 to 100 feet per minute. Day Mixers operating instead of the above mixer emit visible dust into the work environment. During s. meeting with Messrs. S. Enders and E. Lombard we re-Mtpioyees Osar approved dust r^HMkee|jMjttj|4ygjugEuisa9n !t3w mezzanine in the ^pintcy of the i Mixer is reactivated. Also, it was^jMMMkled^thaj: Mfceov^ organic respirators be worn by emj4HMuriMEraaaerdas -brake shoes ^rom the conveyors to drying ifter^rhe--adhesive application'operations. We were informed that the transfer operation will be automated in the future to eliminate the handling and storage of freshly coated brake shoes. They will be fed directly into drying ovens. hm cc: N. A. Trombley /V/ L. R. File Memo Trenton Chemical Division Plant August 28, 1969 M. Schuman, State of Michigan Division of Occupational Health, reviewed ventilation control facilities as a follow up to an industrial hygiene investigation in February 1969. Friction Materials Building VentlletLon -control in the recently installed (MMHfllPeke aMi Appeared to be UpMllent. The brake lining Littleford mixer operations including weighing of asbestos and lead appeared to be satisfactorily controlled. Operations involving the transfer of brake lining material to the extruder hopper and removing brake lining slabs from the extruder table require control to reduce exposure of employees to toluene vapor. K. L. Hasselkus, Facilities Engineering Department, informed us that the present plans are to build a platform above the extruder in order to transfer brake lining material from the container to the hopper. This .method of transfer would ettUMM Above ling the the hopper and would reduce the major source of exposure. Ue were informed that four to six weeks will be required to determine if this procedure will be satisfactory from a production standpoint. K. L. Hasselkus, also, indicated that present plans include i^pUtlea#fAhut ventilation at the end of the extruder . This will not be Installed until the method of material tr*nsfer is rBnlvAH. hm *r cc:: N. A. Trombley D.L.E.