Document gDomEJ6xaqZgDQOMVQO2xG6qQ

CY: ROGER ABER/RHOHDA KISTLER-Central Offlce/LOU GERGELY-Ass't. Super./els PLAINTIFF'S EXHIBIT BRK-243 tiKKwh mm Hay 21, 1987 Mr. Michael X. McGinnis Supervisor, Safety Truck and Bus Group Moraine Assembly Plant General Motors Corporation 2601 w. Stroop Road P.O. Box 1291 Dayton, Ohio 45401 Dear Mr. McGinnis: On May 4, 1987 an industrial hygiene survey vas accomplished at your facility by Roger Aber, Industrial Hygienist vith the Industrial Commission of Ohio, Division of Safety and Hygiene. The purpose of the survey vas to evaluate employee complaints vithin the vehicle start up area. Previous evaluations have been accomplished by outside sources and by General Motors Corporation industrial hygienists. Results were telephoned to Mr. Jim Rittenhouse on May 19, 1987. SAMPLE METHODOLOGY Breathing zone samples were collected for total particulates using preveighed PVC filters connected to calibrated Bendix high volume air samplers. Also, breathing zone samples for ethylene glycol using silica gel tubes connected to a calibrated Bendix high volume air sampler and a MDA low volume air samplere vere collected. Carbon monoxide vas determined using Draeger diffusion tubes vith holders attached to several employees. In addition total aldehydes as formaldehyde vere collected using a midget impinger containing sodium bisulfite solution connected to a calibrated MSA high volume sampler. The impinger vas placed on the ventilation hood vhere the truck's exhaust is captured. Samples vere submitted to an American Industrial Hygiene Association accredited laboratory for analysis. Results are listed in Table I. Formaldehyde and Nitrous Fumes vere collected using Draeger direct reading detector tubes. Dftyton District OffiC# Corporal* Pt*M OWc# BuOding MOO Po# Av*. Suit* 330 Dayton, CH 45414*2553 (513) 698-3206 Mr. Michael McGinnis General Motors Corporation 2 DISCUSSION OF RESULTS Examination of the data in Table I indicates that all results are below the standards or recommendations noted. An explanation of formaldehyde should be made. Exposure to low airborne concentrations of formaldehyde causes irritation, especially of the eyes and respiratory tract. Because formaldehyde is soluble in water, the irritant effect is limited to the upper section of the respiratory tract. A concentration of two to three parts per million (ppm) causes slight irritation of the eyes, nose, and pharynx. "Threshold limit values refer to airborne concentrations substances and represent conditions under which it is believed that nearly all workers may be repeatedly exposed day after day without adverse effect. Because of vide variation in individual susceptibility, however, a small percentage of workers may experience discomfort from some substances at concentrations at or below the .threshold limit; a smaller percentage may be affected more seriously by aggravation of a pre-existing condition or by development of an occupational illness." (Threshold Limit Values for Chemical Substances in the Work Environment Adopted bv ACGIH with Intended Changes for 1986-87. p. 2. ) " SUMMARY The results indicate no problems on the date of the survey. This follows previous tests completed within the engine start up area. On the day of the survey, the individuals who had registered complaints were not present. These Individuals may be more susceptible to the airborne concentrations of substances and may need to be medically evaluated to determine their fitness for working in this area. This may become more apparent in the summer months as the temperature in the area will be higher and an inversion could develop holding airborne concentrations of substances closer to the floor area. Employees in the area noted on warm days a haze over the area which could indicate an inversion. If there are any questions regarding the contents of this report,- or to request additional assistance, please do not hesitate to contact the Dayton District Office by calling (513) 898-3206. Respectfully, 1 Atch Table Industrial Hygienist V t1987 (Page 2 o 2) RECORDS CERTIFICATION I, the undersigned, an employee of the Bureau of Workers' Compensation, do hereby certify that the microfilm images on this reel of microfilm or microfiche are complete and accurate reproductions of the original records of the as accumulated during the regular course of business, and that'it Is the established procedure of this department to microfilm its records for permanent file and to dispose of the original records after microfilm reproductions have been made.