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.04 <br /> 3.0 Hazards <br /> 3.1 Known/Suspected Chemical Hazards <br /> The primary suspected chemical hazards are fuel fumes and carbon dioxide. Fuel fumes from <br /> gasoline tanks can be explosive. Diesel fumes are less volatile, however they may pose an <br /> aspiration hazard if they are aerosolized. The evaporation of dry ice (carbon dioxide) displaces <br /> oxygen and may pose an asphyxiation hazard. <br /> In addition to these chemicals,the workers may be exposed to petroleum fuel exhausts, and <br /> volatile organic compounds (VOCs)including benzene, from the traffic. Over exposure to these <br /> compounds can cause headache, dizziness, nausea, and eye, nose and throat irritation. Some of <br /> the chemicals of concern have been determined to cause cancer and reproductive harm. Table 1 <br /> consists of a list of representative chemicals of concern and their occupational hazard <br /> characteristics (PELs, IDLHs, etc.). Appendix A lists the Proposition 65 chemicals of concern <br /> which is required by the State of California. <br /> Overall Hazard Level: I ❑ Serious ® Moderate ❑ Low ❑ Unknown <br /> Onsite Monitoring Required ? ® Yes ❑No <br /> 3.2 Monitoring for Chemical Hazards <br /> Combustible Gas Indicator(CGI)/4-Gas Meter: During tank closure activities both the air in <br /> the breathing space of the workers and at the active face of the tank will be monitored <br /> continuously using a combustible gas indicator(CGI) to determine the concentrations of <br /> explosive gases relative to the Lower Explosive Level (LEL). After the introduction of dry ice <br /> into the tanks, the bottom, middle, and top of the tank should be monitored for LEL and oxygen <br /> levels. <br /> Photoionization Detector(PID): During closure activities, the breathing zone will be <br /> monitored with a PID for non-methane organic vapors concurrently with CGI/4-Gas Meter <br /> monitoring to determine if any gases detected are likely to be toxic. A PID is not sensitive to <br /> organic carbon levels at lower concentrations than the CGI, thus it should be used to monitored <br /> the breathing zone.. <br /> CNCU:ISHAREIUST0:-0068.doc 3-1 <br />