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4 I i a i •Ethylbenzene TWA = 100 ppm or 434 mg/m STEL = 125 ppin or 543 mg/m. *Xylene TWA = 100 ppm or 434 mg/m. STEL = 150 ppm or 651 mg/m, (Note m = cubic meter) 5.0 PROTECTION FROM EXPOSURE 5.1 inhalation Breatlung a gas, vapor, mist, fume, or dust is the most common accidental form of exposure, flus route of entry is the most likely to cause systemic illness Half-face masks with the appropriate cartridges or dust filters may be required while conducting sampl ng or well installation operations No excessive facial hair, which interferes with a satisfactory fit of the mask-to-face seal, will be allowed on personnel regwred to wear respiratory protective equipment 5.2 Skin Absorption Skin exposure to hazardous materials may result in skin irritation or penetration Skin penetration is the second most common accidental means of entry of chemicals into the body The following precautions may be required when performing any on-site activities described in this work plan • Ensure that all skin areas which may be contacted are protected during site work by wearing rubber boots and disposable coveralls and gloves • After completing the day's work, remove and dispose of contaminated coveralls • Contaminated rags and other disposable items such as gloves should be bagged for disposal in appropriate on-site containers, care should be taken to avoid skin contact with these items • Equipment which has conte in contact with the soil at the site should be thoroughly cleaned before leaving the site • Unnecessary contact with potentially contaminated surfaces should be avoided Whenever possible personnel should avoid walking through mud, puddles, and other discolored surfaces, kneeling on the ground, leaning, sitting, or placing equipment on drums, other containers, vehicles, or the ground • BRUNSING ASSOCIATES INC