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0 w <br /> Santa Fe Pacific Pipeline Partners, L.P. J-6075.03 <br /> Stockton Terminal HEALTH & SAFETY PLAN January 1994 <br /> 4.0 HAZARD EVALUATION AND CONTROL MEASURES <br /> 4.1 Fire and Combustible Gas Ignition <br /> Combustible vapors emitted by free-phase hydrocarbons or <br /> hydrocarbon impacted soils in soil cutting piles could possibly <br /> ignite, resulting in a fire. <br /> CONTROL: Control of potential sources of ignition is a primary <br /> concern during field activities on this project. Smoking will not <br /> be allowed at the drillsite. Fire extinguishers will be positioned <br /> in close proximity to the drillsite for timely access. Ambient air <br /> will be monitored with a photoionization detector (PID) every <br /> 15 minutes. LEL (lower explosive limits) tests will be performed <br /> every 15 minutes. Soil cuttings will be drummed to minimize <br /> exposure. <br /> 4.2 Toxic Vapor Exposure - Benzene and other Hydrocarbons <br /> The volatile fractions of hydrocarbons in soil can be released by <br /> exposure to open air. This release of vapors can occur from piles <br /> of soil cuttings, excavation, and during the collection of soil <br /> samples. Inhalation of these materials may cause illness (see <br /> Section 12). Skin contact with this material also presents an <br /> exposure potential. <br /> CONTROL: An H-Nu PID will be used periodically to monitor <br /> ambient air if the release of vapors is suspected during activities, <br /> of if hydrocarbon odors are detected by smell. Air purifying <br /> respirators (APR's) with combination chemical cartridges will be <br /> available for use if vapor concentrations reach designated action <br /> levels in the breathing zone (Section 5.0). Nitrile gloves and <br /> tyvek coveralls may be worn in some instances to prevent skin <br /> contact. Using a Sensidyne air pump and benzene detector <br /> tubes, or an equivalent system, benzene concentrations will be <br /> measured in the breathing zone at the beginning of work and <br /> whenever the PID measures greater than 5 units. <br /> Page 4 <br />