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11.03.90 04:44 V714 454 9800 KkJESTIC TECH <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 snall be eliminated, <br />all employees removed from the work area. and the location <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 />WARNING -LEL measurements below 109: indicate the following: <br />The atmsophere is not considered flamable/explosive. <br />The atmosphere concentration may change (i.e.. get <br />better, get worse). <br />The 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 />