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kJESTIC TECHNOLOGIES, INC. <br /> With the exception of Trichloroethane, the identified <br /> hydrocarbon constituents do not have significantly high <br /> vapor Pressure. <br /> Most work operations are to be performed after any <br /> remaining tank contents have been removed. <br /> The two phases of work where occupational exposures to <br /> chemical hazards are likely to be most significant are the <br /> initaial tank pumping (if required based on existence of <br /> residule contents) and the excavation of any contaminated <br /> soils. Because no Previous site data is available which <br /> allows for further characterization of these hazards Prior <br /> to commencement of work, the SHP requires that periodic air <br /> monitoring be conducted during operations to evaluate <br /> current conditions and the need for use of personal <br /> protective equipment, including respirators. <br /> 8. 2. 2 FLAMMABLE/EXPLOSIVE ATMOSPHERES: <br /> Because many of the constituents identified in this project <br /> are flammable, tanks and pipelines top be removed or closed <br /> in place (specific pipelines only) . may contain, or generate <br /> upon handling. flammable/explosive atmospheres. For this <br /> project. any atmosphere containing ten percent or greater of <br /> the lower flammable limit relative the calibration gas of <br /> the air monitoring instrument used to sample such <br /> atmospheres ( 10% LEL) shall be considered a flammable and <br /> explosive atmosphere. In the event a flammable/explosive <br /> atmosphere is identified. all sources shall be eliminated, <br /> all employees removed from the work area, and the locatien <br /> ventilated , in the case of tanks, the interior shall be <br /> inerted with carbon dioxide (i. e. . dry ice) prior to any <br /> additional handling. Care shall be taken to keep all field <br /> personnel upwind during all tank inerting operations . <br /> WAP.NING-LEL measurements below 1099 indicate the following: <br /> The atmsophere is not considered framable/explosive. <br /> The atmosphere concentration may change ( i. e. , get <br /> better, get worse) . <br /> Tne atmosphere still contains high concentrations of <br /> measureable hydrearbons with may likely be toxic (or <br /> even fatal) if personnel exposure is not controlled. <br />