WORK PLANS_FILE 2 - Laserfiche WebLink

Home Browse Search

i 6. Heat stress 7. Cold exggsu � 8. Biology 5.2 CHEMICAL HAZARDS Hazardous chemicals that may be encountered onsite include diesel and gasoline hydrocarbons. These chemicals are volatile, flammable, and moderately to extremely toxic. Potential hazards associated with petroleum hydrocarbons include inhalation,ingestion,and skin absorption of toxic vapors, liquids, or dusts. Gasoline vapors in high concentrations (greater than 300 parts per million [ppm]) can cause eye, nose,and throat irritation, headaches, dizziness,and anesthesia. Skin contact with liquid gasoline may result in irritation and dermatitis, and absorption of specific tonic petroleum fractions. Toxic petroleum hydrocarbon substances include the following volatile organic compounds (VOC): benzene, toluene, ethylbenzene, and total xylenes (BTEX). Benzene is a known human carcinogen and, along with toluene and xylenes,can cause damage to an unprotected individual's liver, kidneys, and central nervous system. Ethylbenzene is a skin' irritant in vapor and liquid form. 6.0 HAZARD ASSESSMENT Consistent efforts will be made throughout the project to evaluate the chemical and physical hazards described above. Fire, explosion, and VOC exposure hazards will be evaluated in the following manner. 6.1 FIRE AND EXPLOSION A direct-reading portable combustible gas indicator(CGI), which measures VOC concentrations in ppm or as a percentage of the lower explosive limit (LEL), will be used to evaluate the possible formation of flammable atmospheres in and around the work area. Continuous measurements will be obtained at the top of each borehole throughout the drilling operations. Periodic measurements will also be collected in any confined ` that may contain and accumulate combustible vapors. 6.2 EXPOSURE TO VOC f, Airborne concentrations of VOC will be monitored with the CGI described above. Measurements will be obtained from'the top of each borehole and at stockpiles of soil cuttings.