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iRl <br /> � .c5,t1r Y"fin 'u. { '^ "; .. 11oMMIRMI <br /> r+r 3.0 JOB HAZARD AXALYSIS <br /> Hazards likely to be encountered onsite include those <br /> commonly encountered when operating any mechanical equip- <br /> menc, such as the danger of failing objects or moving <br /> risksnery. Simple associated with operating ecautions will reduce or eliminate <br /> operating such <br /> A qualified drilling contractor will be employed to deliver <br /> ual - <br /> and operate all drilling equipment as needed. Only q <br /> tied personnel will have -any contact with this equipment. <br /> All onsite personnel, including the drilling contractor and <br /> his employees, will be required to -wear hard atswhen <br /> in <br /> close proximity to drilling eq_ pts <br /> ng <br /> or handling <br /> gloves will be worn by persons collecting <br /> samples, to prevent exposure to contaminants. Gloves will <br /> be changed between samples, and used ones discarded, to <br /> avoid cross-contamination. Proper respiratory equipment <br /> will be worn if vapor contamination levels onsite exceed <br /> action levels as determined using a Photo-Ionization <br /> Detector (PID) or Organic Vapor Analyzer (OVA) . Further- <br /> more, no onsite ar.oking, open flame, or sparks will be <br /> permitted, to prevent accidental ignition of gasoline <br /> contamination. All personnel <br /> shall to the <br /> safetyprocedures and of Caltrans. <br /> 3.1 Risk Assessment Summar <br /> ils anticipated onsite as majo <br /> Expcsr contami- <br /> tire to chemcanants, including benzene, toluene, and xylene (BTX) , <br /> ethylbenzene, gasoline fuel hydrocarbons, and tetraethyl <br /> to <br /> lead, represents a hazard because they are modehreshold <br /> a_xtremaly toxic and most are highly flammable. Thresh(STELISold <br /> Limit Values (TEN'S) , Short Term Exposure Limits <br /> and Toxicf.ty Levels (LD50, oral-rat) , all in mg/kg (ppm) , <br /> are listed below: <br /> Com TLV STEL Toxicit Skin Contact <br /> _ l <br /> 25 4894 <br /> Benzenes _ <br /> Toluene 100 150 5000 - <br /> Total Xylenes 100 150 4300 0.1 <br /> Tetraethyl lead - - <br /> Benzene is considered an extreme cancer hazard. Applicable <br /> MSDS forms are included in Appendix C. <br /> 3.2 Exposure Nonitori . <br /> A Photo-Ionization [detector (PID) or. Organic Vapor Analyzer <br /> nd <br /> (OVA) will be used to monitor vapor concentratiprotective <br /> the site. Should concentrations exceed TLV s, p <br /> measures will be implemented. <br /> ;� <br />