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3.2 Route of Entry <br /> A primary exposure route of concern at the Site is inhalation of vapors during drilling operations. <br /> Air monitoring, using direct-reading instruments for volatile organic compounds shall be <br /> performed during work activities. <br /> Direct contact of the skin and eyes with liquid or dust is another important route of exposure. To <br /> protect workers against skin exposure,they will wear specified protective clothing,respirators and <br /> safety glasses for operations involving potential exposure to hazardous materials. Proper personal <br /> decontamination procedures will be emphasized during remedial construction activities. <br /> Although ingestion should be the least significant route of exposure, employees will be made <br /> aware of ways in which this type of exposure can occur and methods to avoid such exposure. <br /> Deliberate ingestion of chemicals is unlikely. <br /> Personal hygiene habits,which may provide a route of entry for chemicals(such as failure to wash <br /> hands before eating),will be restricted. Proper decontamination procedures will reduce/eliminate <br /> potential of ingesting hazardous materials. <br /> Site personnel will wash their hands, face and other exposed parts of their skin before eating or <br /> smoking. <br /> 3.3 Scope of Work <br /> FREY will be responsible for the following tasks/activities: <br /> • Install,purge and sample soil vapor probes <br /> • Conduct vapor extraction pilot testing <br /> 3.4 Physical Hazards <br /> In addition to chemical hazards,the potential for physical hazards exists. Physical hazards include, <br /> oxygen deficiency, explosive atmosphere, heat and cold stress, noise, electrical, and slips /trips / <br /> falls hazards. <br /> 3.4.1 Oxygen Deficiency <br /> Oxygen deficiency may occur on-Site during drilling operations, due to displacement of oxygen <br /> by other gases. The oxygen content of ambient air is 20.9 percent. Physiological effects of oxygen <br /> deficiency are readily apparent when the oxygen concentration decreases below 16 percent. <br /> Oxygen-deficient conditions may be controlled by air monitoring areas for oxygen concentrations <br /> using an LEL/02 Meter. Air monitoring will reduce risks by indicating when action levels have <br /> been exceeded. All operations shall cease and desist if oxygen concentrations are below 19.5 <br /> percent or exceed 21.5 percent. <br /> FREY Page 5 <br />