Document 8V5BJ0KgydYbzak8nDn84498a

Table I On m / t- 1ie.lp.ht8 of Dxtf;t and of Lea d Begcved Frets the Air by Electrostatic 'Precis itat ion While Abrasive Wheels Containing Le ad Mere Being ?Tsed to Cut Cl020 fteel. (*?o Exh oust Ventilation) Satinle Humber and Description Duration of Sampling Kgs. Particulate Matter/M^ Per Cent of Particles Below 10 -Microns in P, Mgs. Pfe Per !*3 of Air Proportion of Lead (Per Cent) Represent by Particles Less Than 10 Microns in 1. Background 13* (rimites) 1.21 - '0.001 before start of operations. i 2. At Breathing ] Zone, while using 1 wheel #A19$~901 {Lead Free) during j 120 cuts. 21* 26 " 2 ''.99 - 0.010 100 3* At Breathing Zone, while using wheel #AX9ft-902 (3? Lead) during 80 cuts. 10* 25" 25.30 79.9 0.ft-87 80.5 3B. General Air 12* from cut-off machine A, At Breathing Zone while using wheel I A 1 9 M 0 3 (12? Lead) during 80 cuts. AB. General Air 12* frosi cut-off machine ID* 25" 9* *5" 9 3ft. *10 7 'i.J0 12.9*' 05.0 91.0 - 0.666 1.200 1.317 * 71.5 r>-- 03* *SJ< oo CO io o o o Ill fable I, rage 2 Sample Humber and Description Duration of Sampling . 5. Background before start of afternoon operations. 15* 6 . Breathing 2one, while wheel #A194-9G1 (Lead Free) was used during 80 cuts. 11* 36" SB. (tenora! Air 12 * fro wheel 11 * 36" %s. Particulate ^atter/?!3 0.76 Per Cent of Particles ltelow 10 Microns in D. - Mgs. Pb ^ Per !'3 of Air Proportion of Lead ('or Cent) Hepresented by Particles Less ' Than 10 fitcron a In p. 0.525 29.50 ( ~ 0, 050 78. C 26 *OP ~ 0^*9 92.5 7. Breathing Zone, while wheel #Ai9$-902 (3 Lead) was used during 58 cuts* 7B. General fir 12 * from wheel #A19*5~902 <3S Lead) during 58 cuts. 8. Breathing Zone, while wheel #198*903 (12% Lead) was being used during 80 cuts* 5* US" 6* ft5" 7* ft?" 35.20 ft3 .10 33.00 85.5 ~ f'0 .5 2.960 >.811 71.3 c LO 8ES000 3 X Sample fiuf'Jber and Description Duration of 8B* General Air IS* fron wheel #A19*~903 (12? teed) during 80 cuts* 7* *52" 9. Breathing Zone- while wheel # A 1 9 M 0 3 U 2 ? Dead) was being used during 86 cuts* 7* 29" Average Exhaust ventilation on* Excluding samples 1, 2, 5 and f,. 1, pa.ee -> Per Cent ef Particles Below 10 Micron In . ?*?: Pb Per s3..of Air 0.770 Proportion of Leatl (Per Cent) Hepresenter by Particles Less Than It? Microns In P. 70.0 0.100 84.il 75.0** <30 #o p*<3 < > Ui Frequency of Occurrence (Per Cent) of Particles Found In the .Ataosohgre, According to Size Sample Humber and Description Sampling Hethod 3. At Breathing Son while using wheel 0 A l h - $ 02 (3% Lead) during 80 cuts. 3B. General M r * 13 feet from cut-off machine* leetroatatic Precipitator Electrostatic Precipitator 3C. At Breathing Zone while using wheel #A19*~902 <3S Lead) during 80 cuts* fiemhrane ' Filter A* At Breathing Zone while using wheel fA19*-903 <12? Lead) during 80 cuts* 7* At Breathing Zone while wheel #A19*-S02 (3t Lead) was used during 68 cuts* ' Electrostatic Bredcltator Fleetrootatlc ?recip11ator 8* At Ereathing Zeno while wheel #A19*>~903 0 2 * Lead) was being used during $0 cuts* Electrostatic Precipitator 8C. At Breathing Zone while wheel #A19*-903 (13? Lead) was being used during 80 cuts. 'omforanc F'lltor Limit of detection approximately 0.7 rieron. 1.. 0-- 1" . 7.5 10.7 63.0 10.9 8.0 3.5 70.0 Ban in Hicrons 1-3" 2-5" ... 5-10" 10 and Greater 17.3 3}U 0 20.6 : 20.1 25.5 18.2 31.8 18.0 16.6 1.B 15.0 Hone 32.0 39.1 19.0 : 9.0 ?*u* *3.9 9.2 1*.5 20.0 : 39.5 17.5 19.5 16.7 13.1 1.* 0.8 8SuCG Comparison of Findings From Samples Collector} V/lt Sample Humber and Description Electrostatic Preeirifcater Sampling Total Le?-d Mgs. Pb/^3 in Time Per Particles < 10 ,u* 3. At Breathing Zone while using wheel I A 1 9 M 0 2 (3% Lead) during SO cuts. 10* 25w Oji f? 0.393 t. At Breathing Zone while using wheel #A19*-903 (12$ 'Lead) during SO cuts. 9* *5* 1*200 1.090 7. Breathing Zone while wheel m 9 * - 9 0 2 (3% Lead) was used during 58 cuts. 6 5" 2.960 2.100 8* Breathing. Zene while wheel #A19*-903 (12 Lead) was being used during 00 cuts. 7* ?J2tt 1.62*1 1.313 Fro sedimentation data. Sampling rate 3 liter per minute, the volume of air spr.pt the samples were collected closer to the wheel. Three l?ifferent Pieces of qulpjaent Two Store feasier noaplino :;!rs* "Se spi pelile" Ttoo Lead per ??3 Membrane Filter** faiViclinf Kgs. Pb Tine Per m 3 ID* 25" 0*250 10* 25" 0.800 ?* 1" 1*22 * > 1.10 Hone Taken ione Tqken * 2$* un ?* 52" 3*330 ed was less than 1 cubic foot and QO CO CO m CD O o \U Sample Humber and Description 3. At Breathing Zone while using wheel . M l 9 * - 9 0 2 C3f Lead) during 30 cute 3B. Cenerai Air, 12* from cut-off machine. ft. At Breathing Zeno while using wheel M 1 9 4 - 9 0 3 (12# Lead) during 80 cuts. ftB.* General Air, 12* from, cut-off machine. 7* At Breathing Zone while wheel M19&-902 (3f Lead) was used during 58 cuts. 7B, General Air, 12* frossi wheel 9k19^-982 (3S Lead) during 58 cuts. 8. At Breathing Zone while wheel #AX9ft-903 (12S Lead) was being used during 80 cutt. SB,* General Air, 12* troia wheel #A19*~903 (12$ Lead) during 80 cuts. iti!li grans of Lead Per Cubic f^eter of M r In Fine Particle (<I0p) In Coarse Particles ( > 1 0 a.j) Total 0.393 G,09ft C.ft-S" 0.ft?5 1,020 0,191 0,180 0 6i 1*2 0? 1,060 2.110 0,253 0.85Q 1.313 2.0cO 0,J92 1.318 0.319 0,306 0.811 0,5ftl 0.229 0.770 ^Collected simultaneously with sample Indicated by numeral only. KE 0005389 Mr. S. D. Mark, Jr. Manager Technical Branch Bonded Abrasives Division Carborundum Company, Inc. Building 32-3, Buffalo Avenue Niagara Falls, New York Dear Mr. Mark: As directed by Mr. R. A. Baumgartner in a telephone conversation on December 9th, we are enclosing copies of four tables of data developed from the analysis of samples collected in your plant on November 26th. V'e belicjve the tables to be self-explanatory, but if you need more detailed information please, let us know and we will try to supply the additional information. As was indicated to fir. Baumgartner our final report will be submitted as soon as possible following the return of Dr. R. A. Kehoe, Director of the Laboratory from Florida during the first week of January 1964. As per your request, we are also enclosing a statement covering the cost of this work. The total cost includes a charge for 'writing the final report. Sincerely yours, JC/meg Enclosures c c : Dr. Robert A. Kehoe J. Cholak Director, Division of Industrial Hygiene Technology 0005330