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Underground Utilities <br /> If drilling equipment is to be used, BSK will attempt to locate underground utility locations prior to <br /> commencement of drilling activities. Resources may include site plans, utility companies, Under- <br /> ground Service Alert(USA) (800-642-2444), and had auguring methods. <br /> Traffic Hazards <br /> Typically, UST sites are in or near areas of subject to hrough pedestrian and/or vehicular traffic, <br /> such as driveways or service areas. Traffic cones an or barricades are used to exclude unauthorized <br /> persons and vehicles from the excavation and work/e)clusion zone. <br /> Chemical Hazards <br /> Gasoline and diesel fuels are composed principally of aliphatic and aromatic compounds. Benzene, <br /> an aromatic compound, is considered to be the most s gnificant health risk because of its suspected <br /> carcinogenic potential. Waste oil (used crankcase oil) has a significant inorganic lead component. <br /> Principal exposure routes for benzene and other gasol ne and diesel constituents include the <br /> following: <br /> Inhalation of vapors and contaminated dust <br /> Skin absorption <br /> Ingestion of contaminated soil and water, espe Tally if poor personal hygiene is <br /> practiced <br /> i Skin and/or eye contact with contaminated soi or water <br /> Benzene vapors present a potential health risk that needs to be monitored and controlled. The <br /> current Cal/OSHA PEL for benzene is 1 ppm based on an 8-hour time weighted average (TWA). A <br /> maximum concentration of 100 ppm of petroleum hydrocarbon vapors in the work breathing zone is <br /> recommended without respiratory protection. A phot ionization detector(PID) calibrated daily to <br /> 100 ppm isobutylene will be routinely used to monito petroleum hydrocarbon vapors in the work <br /> breathing zone. If persistent petroleum hydrocarbon Napors in excess of 100 ppm are observed, <br /> appropriate respirators will be donned. Personnel shoLild work upwind or cross wind of the drill rig, <br /> if possible. <br /> � Skin contact with potentially contaminated soil or gra indwater can be minimized by wearing <br /> personal protective clothing. <br /> A-10 <br />