Document dYK9p1EyB3oKb3Y3q0RQ4y1NR

INDUSTRIAL. HYGIENE REPORT TEXAS. OPERATIONS: FILE NUMBER: DOW CHEMICAL USA AN OPERATING UNIT OF THE DOW CHEMICAL COMPANY DATE ISSUED: PLANT CODE: TITLE: /un<e DEN 3693 NOVEMBER 2, 1990 20400 EVALUATION OF WELDING FUMES AND TOTAL PARTICULATES AT THE DENVER EXTRUSION PUNT IN Personal and area exposures to welding fumes and total particulates were evaluated in August, 1990, for employees working in the Denver Extrusion Plant at the new retorque welding station. Results of the eight components analyzed for welding fumes (welding fume total particulates, iron oxide fume as iron, copper, lead, manganese, nickel, molybdenum, and chrome), were found to be within acceptable limits. Local ventilation was established for this welding operation. Capture efficiency of visible particulates was very good. It is recommended that employees be informed of these sampling results and this documentation be sent to Industrial Hygiene Services for inclusion within the seventyfive year retention files. DISTRIBUTION: J. M. Boswell, M.D., B-101 D. E. Cragar, B-101 W. Demain, B-101 T. E. Yerina, Denver R. J. Higdon, Denver Cover sheet only G. W. Engdahl, 1803, Midland M. G. Swank, 1803, Midland *J. E. LeBeau, 1803, Midland *L. W. Rampy, 1803, Midland OFFICE COPY RESTRICTED FOR USE WITHIN THE DOW CHEMICAL COMPANY ONLY DO 074949 CONFTDFNTIAL IHS FILE #DEN 3693 PAGE 1 EVALUATION OF WELDING FUMES AT AT DENVER EXTRUSION PLANT, AUGUST, 1990 EVALUATION CRITERIA Industrial Hygiene monitoring is performed to evaluate potential exposure levels to employees both as a daily time-weighted average (TWA) and peak or short-term exposures. The results of the monitoring are compared with the recommended exposure guidelines. The values are based on toxicology data and Industrial Hygiene experience. Aoent Welding fumes total particulate Iron oxide fume as iron Copper fume Lead Manganese Fume Nickel Molybdenum Chromium Total Particulate Exposure Guideline 5 mg/m3 5 mg/m3 10 mg/m3 0.2 mg/m3 0.1 mg/m3 0.15 mg/m3 0.05 mg/m3 5 mg/m3 (Cl) 1 mg/m3 3 mg/m3 (STEL 2) 1 mg/m3 1 mg/m3 5 mg/m3 5 mg/m3 1 mg/m3 0.5 mg/m3 10 mg/m3 10 mg/m3 Source* ACGIH-TLV ACGIH-TLV OSHA-PEL ACGIH-TLV OSHA-PEL ACGIH-TLV OSHA-PEL OSHA-PEL ACGIH-TLV ACGIH-TLV OSHA-PEL ACGIH-TLV OSHA-PEL OSHA-PEL ACGIH-TLV OSHA-PEL ACGIH-TLV *ACGIH-TLV - American Conference of Governmental Industrial Hygienists Threshold Limit Value OSHA-PEL - Occupational Safety and Health Administration Permissible Exposure Limit (STEL 2) - Short-Term Exposure Limit - A 15-minute time-weighted average exposure which should not be exceeded at any time during a work day even if the eight-hour time-weighted average is within the TLV. (Cl) - Ceiling Value - An employee's exposure to this material shall at no time exceed the ceiling value given for that material. DO 074950 CONFIDENTIAL FILE #DEN 3693 TABLE I SUMMARY OF INDIVIDUAL AND AREA EIGHT-HOUR TIME-WEIGHTED MONITORING - DENVER EXTRUSION PAGE 2 JOB MASTER #/ CLASSIFICATION/AREA SOC. SEC. # Area-on retorque Station B stand 3' from weld area SAMPLE NUMBER 3342B DATE SAMPLE TIME MIN. 8-8-90 480 8-HOUR TWA TWA EXPOSURES MG/M3 TOTAL PARTICULATE Mo Cr Ni Fe Mn Cu Pb 0.001 <0.001 <0.001 <0.001 0.004 <0.001 <0.001 <0.001 Unit Tech Fabrication 831496 2799-C-C 8-7-90 375 0.008 <0.001 <0.001 <0.001 0.009 0.001 <0.001 <0.001 Area-on retorque Station B stand 2' from weld area 3238-C 8-8-90 480 0.004 <0.001 <0.001 <0.001 0.007 <0.001 <0.001 <0.001 Area-on desk 10' from weld area 3238-D 8-7-90 370 0.009 <0.001 0.005 0.015 0.032 0.053 <0.001 <0.001 Area-on retorque Station 8 stand 3' from weld area 3342-D 8-7-90 375 0.005 <0.001 <0.001 <0.001 0.023 0.003 <0.001 <0.001 Unit Tech Fabrication 831482 3342-C 8-8-90 480 0.015 <0.001 0.002 0.016 0.008 0.001 <0.001 <0.001 Area-on retorque Station 8 stand 1 ' from weld area 2100-C-D 8-7-90 375 0.050 <0.001 <0.001 <0.001 0.038 0.006 <0.001 <0.001 General Contractor - Fabrication 196-58-5830 2799-C-D 8-8-90 480 0.024 <0.001 <0.001 0.001 0.008 0.001 <0.001 <0.001 DO 0 7 4 9 5 1 C O N F ID E N T ! Welding fumes were collected using calibrated Gi1 fan HFS513 air sampling pumps set at 2.0 1pm. A known volume of air was pulled through a pre-welghed 37um, 0.8 micron pore siie Gelman GA-4 membrane filter. After the filter's weight gain was determined, the filters were sent to Analytical Services (with blanks) for emission spectroscopy. <indicates less than (analytical sensitivity of 1 ug) X>