Document MM8k5dV5g3nBLE4r7NQRZ58Vz
-4?jrg2>- DOW CHEMICAL U.S.A.
February 31, 1990
occupational health
TEXAS OPERATIONS PREEPORT. TEXAS 77541
A Accredited by Accreditation Association for Ambulatory Health Care, inc.
Gary Truvar U. S. Contractors, P.0. Drawer 447 Clute, TX 77531
Inc.
FILE 0C-3391W CONTRACTOR APPENDIX
INDUSTRIAL HYGIENE SURVEY FOR WELDING FUMES AT UNIT III PHENOL/ACETONE PLANT, TEXAS OPERATIONS
Two U. S. Contractors, Inc. employees have been included in an Industrial Hygiene Survey conducted by Dow Texas Operations Industrial Hygiene Department. The results of this survey as it pertains to your employees is attached. It is your responsibility to inform your employees of the monitoring results along with the conclusions and recommendations.
Industrial Hygiene Services Texas Operations B-101
DO 074997 CONFIDENTIAL
THIS REPORT IS RESTRICTED FOR USE WITH DOW CHEMICAL USA AND U.S. CONTRACTORS, INC.
AN OPERATING UNIT OF THE DOW CHEMICAL COMPANY
=Quality_. Performance
iAQnc vWll iAT I
CONTRACTOR APPENDIX (CONT'D)
TABLE I SUMMARY OF 8-HOUR TWA AVERAGE EXPOSURES TO WELDING FUMES
UNIT III - PHENOL/ACETONE, 0C-301
JOB CODE/ NUMBER OT JOB CLASS SAMPLES
UELDER/C
12
At 0.02
V205 ND(<0.01)
Ni 0.01
Fe 0.59
INDUSTRIAL HYGIENE GUIDE 5
0.05 1 5
Hn 0.04
8-HR TUA CONCENTRATIONS (MG/H3) Co Ho Cr Cu
<0.01 ND(<0.01) 0.01
<0.01
1 0.05 5 0.5 0.1
Ti02 0.03
CaO 0.03
MqO 0.01
IrO Cd 0.18 ND(<0.01)
10 5 10 5 0.05 C
r> oo z-n o
H O
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--i CO
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CONTRACTOR APPENDIX (CONT'D)
TABLE II SUMMARY OF 8-HOUR TWA INDIVIDUAL EXPOSURES TO WELDING FUMES
UNIT III - PHENOL/ACETONE, 0C-301
JOB CODE/
SOCIAL SEC.
JOB CLASS DATE
NUMBER
Al
UELDER/C
10/30/89 105-40-9497 10/30/89 463-70-0974 11/02/89 105-40-9497 11/02/89 463-70-0974 11/03/89 105-40-9497 11/03/89 463-70-0974 11/06/89 105-40-9497 11/06/89 463-70-0974 11/07/89 105-40-9497 11/07/89 463-70-0974 11/08/89 105-40-9497 11/08/89 463-70-0974
<0.01 <0.01
0.01 0.01 0.01 0.02 0.02 0.01 0.02 0.01 0.05 <0.01
V205 Ki Fe
ND(<0.01) ND(<0.01) ND(<0.01) ND(<0.01) ND(<0.01) 0.01 ND(<Q.01) <0.01 ND(<0.01) <0.01 ND(<0.01) <0.01 ND(<0.01) 0.01 ND(<0.01) 0.01 ND{<0.01) <0.01 ND(<0.01) <0.01 ND(<0.01) <0.01 ND(<0.01) <0.01
0.01 0.01 0.34 0.32 0.84 0.45 1.4 0.35 0.80 0.19 2.2 0.11
8-HR TWA CONCENTRATIONS (MG/M3)*
Mn
Co Mo Cr
Cu Ti02 CaO HqO ZnO
Cd tot;
ND(<0.01) ND(<0.01) ND(<0.01) <0.01 ND(<0.01) N0(<0.01)
NO(<0.01) ND{<0.01) ND(<0.01) ND(<0.01) NO(<0.01) ND(<0.01)
0.03 KD{<0.01) N0{<0.01) 0.01 ND(<0.01) 0.01
0.02 ND(<0.01) ND(<0.01) <0.01
<0.01
0.01
0.08 KD{<0.01) ND(<0.01) 0.01 ND(<0.01) 0.03
0.03 H0(<0.01) N0(<0.01) <0.01
<0.01
0.03
ND(<0.01) ND(<0.01) ND(<0.01) 0.02 ND(<0.01) 0.05
0.03 ND(<0.01) ND(<0.01) <0.01
<0.01
0.02
0.04 ND(<0.01) M0(<0.01) 0.01 KD(<0.01) 0.02
0.02 ND(<0.01) KD(<0.01) ND(<0.01) NO(<0.01) 0.01
0.16
<0.01 N0(<0.01) 0.01
<0.01
0.12
0.01 ND(<0.01) N0<<0.01> ND(<0.01) ND(<0.01) HD(<0.01)
0.01 0.01 0.04 0.03 0.04 0.04 0.07 0.01 0.08 0.07 0.08 0.01
ND(<0.01) NO(<0.01) HD(<0.01>
NO(<0.01) ND(<0.01) ND(<0.01)
0.02
1.0 ND(<0.01)
0.02
0.83 NO(<0.01)
0.02
0.01 NO(<0.01)
0.02
0.01 ND(<0.01)
0.03
0.01 ND(<0.01)
0.01
0.01 N0(<0.01)
0.02
0.13 ND(<0.01)
0.01
0.46 ND(<0.01)
0.03
0.03 MD(<0.01)
0.01
0.50 NO(<0.01)
0.14 0.21 2.7 2.0 2.4 1.4 4.2 1.5 6.9 1.8 5.7 1.3
INDUSTRIAL HYGIENE GUIDE 5
0.05
1
5
1
0.05 5 0.5
0.1 10 5 10
5
0.05 C 5
DO 0 7 4 9 9 9
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* All sample times were 480 minutes. ** Kelt-arc welding on stainless steel. The other samples were stick welding on galvanized and/or carbon steel.
CONTRACTOR APPENDIX (CONT'D)
CONCLUSIONS AND RECOMMENDATIONS 1. All average and individual 8-hour time-weighted average (TWA)
personal exposures of the Welder/Contractor (C) to the metal fumes analyzed (A1, CaO, Cd, Co, Cr, Cu, Fe, MgO, Mn, Mo, Ni, Ti02, V2O5 and ZnO) were below the established Industrial Hygiene Guides (IHGs). 2. The average 8-hour TWA total welding fume exposure (n-12) of the Welder/C was below the established IHG. Total fume exposure during he!i-arc welding was less than during stick welding. 3. During stick welding, the average total fume exposure was 2.5 mg/m3 (n=10) which was less than the IHG of 5 mg/m3. Two of the ten samples exceeded the IHG primarily because welding was performed for a full shift. The 95th Percentile was calculated to be 8 mg/m3. This data suggests that approximately 20% of the exposures exceed the IHG. 4. Based on the need to prevent acute toxicity from welding fumes, recommendations for respiratory protection and a flexible/ adjustable local exhaust ventilation system were made. 5. It was recommended that Unit III management provide a portable welding screen to be installed in the welding shop to protect personnel working nearby from the ultra-violet radiation emitted from the welding process. .6. It is recommended that the Welder/Cs receive welding fume health hazards training and be informed of the results of this survey.
DO 075000 CONFTDFNT TAl,