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x fat NMN VW P� field work performed at refineries, sites where spills of chemicals other than the substances listed above have occurred, and any other f site or activity identified by the business unit HSO. � a 507.4 RESSPONSIBILITY AND AUTHORITY The Project Manager (PM has overall, responsibility for safe conduct of all field work, including ensuring full implementation of this procedure by project staff and subcontractors assisting with field work. The PM shall assign C' .� site Safety Officer (SSO) to attend to day-to--day health and safety matters in the field or, if qualified, nay elect to serve as SSO. the SSO must be on-site whenever work by employees of WCC or its r subcontractors is being performed at the site. Both the PM and SSO are authorized to suspend work when working conditions beco.me too hazardous and -to remove from the site any WCC and subcontractor ` employee whose conduct endangers the health and safety of the employee or off others. 507.5 HAZARD EVALUATION Petroleum distillate fuels are mixtures of aliphatic and aromatic hydrocarbons. The predominant types of compounds in fuels w are paraffins (e.g. , pentane hexane) , naphthenes (e.g- , ; cyclohexane) and aromatics (e.g. , benzene, toluene, polynuclear �.. aromatics) . Gasoline contains about BO percent paraffins, 6 percent naphthenes, and 14 percent aromatics. Jp-1 and 4 contain ^- up to 48 percent paraffin, 38 percent naphthenes, and 20 percent r aromatics. Fuel oils and certain jet fuels (JP-3 and 5) contain about 10 percent paraffin, up to 23 percent naphthenes, and up to 78 percent non-volatile aromatic hydrocarbons. Gasohol is gasoline containing 10 to 40 percent ethyl alcohol. To improve their burning properties, compounds such as tetraethyl-lead and ethylene :,ibromide are often added to automotive and aviation fuels. HAS-PRO507 HS-507-2 November 1950 r .