REMOVAL_1997 - Laserfiche WebLink

Home Browse Search

4.2 Chemical Hazard Assessment Hazardous chemicals which may be encountered onsite include gasoline fuel hydrocarbons: benzene, toluene, ethylbenzene, and total xylenes (BTEX): and tetraethyl lead. These chemicals are volatile, flammable, and moderately to extremely toxic. they present a possible inhalation, absorption, and ingestion hazard to onsite personnel. They may damage an unprotected individual's liver, kidneys, central nervous system, and bone marrow. Benzene is a known human carcinogen and ethylbenzene in vapor and liquid form is a skin irritant. Gasoline vapors in concentrations greater than 300 parts per million (ppm) can cause eve, nose and throat irritation, headaches. dizziness. and anesthesia. Skin contact with liquid gasoline may result in irritation, dermatitis and absorption of specific toxic petroleum fractions. OSHA and the American Conference of Governmental Industrial Hygienists (ACGIH) have established exposure limits for these chemicals. Threshold limit value (TLV) is the exposure limit determined by ACGIH to which workers may be repeatedly exposed without adverse effects. The permissible exposure limit (PEL) is the maximum permitted 8 -hour time - weighted average (TWA) of airborne contaminant that a person may be exposed to. The short-term exposure limit (STEL) is a 15 -minute TWA exposure which is not to be exceeded at any time during a workday even if the 8 -hour TWA is below the PEL. The ceiling limit (CL) is the maximum concentration of an airborne contaminant to which an employee may be exposed at any time. PEL, STEL, and CLV's are measured in ppm and/or milligrams per meter cubed (mg/m' ) Exposure limits established by OSHA and ACGIH for contaminants which may become airborne at this site are listed in the following table. Values are from OSHA unless otherwise noted. For purposes of health and safety, the strictest established exposure limit will be used. Compound TLV PEL STEL CL (ppm) (ppm) (ppm) (ppm) Gasoline 300 500 Benzene 1.0 5.0 0.10* 1.0* Ethylbenzene 100 100 125 Toluene 100 150 100 500 Total Xylenes 100 150 100 500 Tetraethyl Lead 0.075mg/m3 Note: *Values specified by ACGIH.