Document YggyJ0zvZV3aRa1MJXnnD8aE

September 2, 1988. TO: LHC 3 Contract & Dow Personnel RE: E-21 Benzene Monitoring Results On July 27, 1988, monitoring was performed using 3M 3500 badges on persons breaking the flanges on E-21 (Quench Water Cooler) to repair an exchanger leak. The results were as follows: CONTRACT PERSONNEL TIME (TWA) PPM BENZENE Ronnie Sagona Alvin Brown (Breathing Air) Willie Gros (Breathing Air) Gerald Taylor Jerry Dubois 495 min. 105 min. 105 min. 495 min. 105 min. .0005 .0004 .0006 .002 LOQ* DOW PERSONNEL Dane D'Armond (Respirator) 215 min. .00004 AREA South end of E-21 240 min. .019 * LOQ - Limit of Quantitation (non-detectable) The TWA (Time Weighted Average ) for benzene is 1 ppm. The persons involved wore no respiratory protection except where noted. The results of this monitoring indicate that there was no exposure problem to benzene during this work. Dane L. D'Armond Industrial Hygiene Contact LHC 3 Df, 14 04 5c-.. CONF T FT;'.!' ' :\1