Document gDnpKqMZKX2ZJp3Y6qokJk1g9

AIRBORNE OUST COUNTS for Conwed Corporation Cloquet, Minnesota August 28, 1972 Personnel Present: E. J. Kleber Customer Service Representative Union Carbide Corporation T. P. Norris Midwest Region Sales Manager Union Carbide Corporation E. McGui11 vary Environmental Control Conwed Corporation UNION CARBIDE CORPORATION Mining and Metals Division Niagara Falls, New York X 416888 The results of microscope counts for air samples collected at Conwed Corporation, Cloquet, Minnesota, August 9th and IOth, 1972 are attached. Apparatus & Procedure Sampling and dust counting were carried out in accordance with OSHA Regulation 1910. 93a. Unlco Personal Air Samplers, calibrated to 2 liters per minute, were used to collect personal breathing zone and environmental samples on Millipore membrane filters of 0.8 micron porosity. Fiber counting was performed on a Leitz microscope utilizing phase contrast Illumi nation at 400X and a Patterson Globe and Circle reticle. Total dust was determined by light field microscopy at I00X. Test Results Three figures have been reported for each sample. They are: 1) Total Fiber - Any material 5 microns or longer having an aspect ratio of 3 or greater. Reported as fibers per mi I IiI iter. 2) Asbestos Fiber - Any material, 5 microns or longer, having an aspect ratio of 3 or greater, which in the judgement of the operator could possibly be asbestos. Reported as fibers per mi I IiIiter. 3) Total Oust - Any fiber or particle present. Reported as million particles per cubic foot. Enclosed for reference is a copy of the OSHA Standard for exposure to asbestos dust. which includes silica and inert dust limits. \ \ X416889 SUMMARY OF DUST COUNTS N.B. No. 1929-2-1 Description BOARD 4 PULP MILL Persona 1 (7.67 min.) Bulk fiber bagger - operator Asbestos Total Fiber Fiber Count Count Fibers/ml;* 5r* Fibers/ml's- 00 1929-2-2 Environmental - No. 3 board machine run-out section- (114 min.) 4' from end of conveyor dumping mineral wool into stock chest 0.15 1.01 1929-2-3 Environmental - Mineral slurry hydropul per tub - (132 min.) eye level above tub 2 bags asbestos dumped every 20 minutes (HP Pellets) 0.19 1 .40 1929-2-4 Persona 1 (2.08 min.) Same as #3, during dumping 1.03 2.06 rota 1 Dust umppcf 0.16 0.55 1 .02 0.85 1929-2-5 COATING MAKE-UP AREA Environmental - Coating make-up deck between #35 mix (145 min.) tank and separan tank 1929-2-6 Persona 1 (9.33 min.) Coating make-up deck on coating make up man as batch of #31 coating is prepared 0 0 929-2-7 FINISHING DEPARTMENT Environmental - No. 3 trimmer - operator's desk (43 min.) 929-2-8 Environmental - No. 4 trimmer - 9' off floor on (46 min.) catwalk by 2nd arbor 929-2-9 Environmental - Between #1 and #3 board dryers - by (115 min.) W. broke hydropul per 6' off floor 1292-2-10 Environmental - No. 3 dry end coating line - slitter (194 min.) area - south side - 6' off floor 1292-2-11 Environmental - No. 3 dry end coating line - station (138 min.) B. East grading station - 6' off floor TUFFLEX DEPARTMENT 1929-2-12 Environmental - No. 2 Tuff lex line - shredder area (75 min.) eye level mount between cotton 1 inter feeder and E. Shredder Cl0 min. blow down with 3 air hoses during samp 1ing3 0.20 0.28 0.15 0.09 0. 16 0 0 2.85 0 31 .38 0.40 1 .68 0.60 0.64 0.50 1 .09 0.58 0.53 0.51 0.43 0.17 1 .20 X41689C N.B. No. 1929-2-13 Persona I (9.75 min.) Description No. 2 Tuff lex machine - transfer section on backtender1s helper Asbestos Total Fiber Tota I Fiber Count Count Dust Fibers/m I > 5A ribers/ml>- 5s* mmppcf 0.88 I .76 2.68 CONWED FABRICS DEPARTMENT 1929-2-14 Personal (7.0 min.) - Conwed Farbics fiber preparation room - operator feeding cotton Iinters into P&S feeders 0 5.51 2.35 1929-2-15 LO-TONE DEPARTMENT Environmenta (104 min.) Lo-Tone #4 - line grinder area 6' off floor 0.16 .44 0.76 X 416891 UNION CARBIDE faRdria*sbcstos____________________________ UNION CARBIDE CORPORATION MINING & METALS DIVISION P.0.B0X 579 NIAGARA FALLS. N.Y. 14302 TEL: 716-285-330 September I, 1972 Conwed Corporation Cloquet, Minnesota 55720 Dear Sir: We would like to have your permission to use the information obtained in the course of the tests conducted at your facility and to furnish it to other parties without identifying your facility as the location at which measurements were taken. The tests shall consist of taking measurements by the membrane filter method of air borne asbestos fiber generated in the course of one or more phases of your manu facturing operations. If you agree to the foregoing, please so indicate by signing and returning the enclosed copy of this letter. Such action on your part shall constitute authori zation to take such measurements at your facility and to use and disclose said information as detailed in this letter. Accepted and Agreed to th i s .3c? day of 4 , 197A*- --------- ------------------------------------------Dlrecjrof of Hanufacturing-Cloquet x 416892 / 7.... ___./r_______ - - 'T.___1 ____ _________________________ |_________ _ __________ 1'|/?60 ; / ^ ja-7^7 I &<rlo?i ____________________ At/Q sya\%..S. ~"~CWC'iij '/TZY.;:zZT..z. '!1 (1fi!We Wi: !-yz^, -1 ML !i _ t * C. /3 Jt/?j A ro- -----___ii---_-_--_-_ii--_--_--_ --11____ !l___1-_-------- l/ Lu /ri U oW ..So-i-^yaS i ,S7Z !.SV7<H 111 (.7$- 2S'i_ (<Cfr\ CL O fO C. 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