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Gasoline vapors in concentrations greater than 300 parts per million (ppm) can cause eye, <br /> nose and throat irritation, headaches, dizziness, and anesthesia. Skin contact with liquid <br /> gasoline may result in irritation, dermatitis and absorption of specific toxic petroleum <br /> fractions. <br /> OSHA and the American Conference of Governmental Industrial Hygienists (ACGIH) have <br /> established exposure limits for these chemicals. Threshold limit value (TLV) is the exposure <br /> limit determined by ACGIH to which workers may he repeatedly exposed without adverse <br /> effects. The permissible exposure limit (PEL) is the maximum permitted 8-hour time- <br /> weighted average (TWA) of airborne contaminant that a person may be exposed to. The <br /> short-term exposure limit (STEL) is a 15-minute TWA exposure which is not to be exceeded <br /> at any time during a workday even if the 8-hour TWA is below the PEL. The ceiling limit <br /> (CL) is the maximum concentration of an airborne contaminant to which an employee may be <br /> exposed at any time. <br /> PEL, STEL, and CLV's are measured in ppm and/or milligrams per meter cubed (mg/m3 ). <br /> Exposure limits established by OSHA and ACGIH for contaminants which may become <br /> airborne at this site are listed in the following table. Values are from OSHA unless otherwise <br /> noted. For purposes of health and safety, the strictest established exposure limit will be used. <br /> ConMmn TLy PEL STEL <br /> (ppm) (ppm) (ppm) (ppm) <br /> Gasoline 300 500 <br /> Benzene 1.0 5.0 0.10* 1.0* <br /> Ethylbenzene 100 100 125 <br /> Toluene 100 150 100 500 <br /> Total Xylenes 100 150 100 500 <br /> Tetraethyl Lead 0.075mg/m3 <br /> Note: *Values specified by ACGIH. <br /> In addition to this section, other standards for materials which might be encountered <br /> have been set in Sections 3.3 through 3.4 of the existing (SSP) for Hamilton Airfield. <br /> These exposure standards will be adhered to. <br /> 5.0 SITE MONITORING <br /> Physical and chemical hazards must be monitored at the site to ensure workers are not <br /> exposed to hazardous situations. Monitoring will be performed during this project as <br /> described below. <br />