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Because of the lack of interaction with contaminant sources and the relatively benign <br /> impact on subsurface conditions, site characterization activities present relatively low <br /> opportunity for chemical exposure. Though contact and/or proximity to soil cuttings, core <br /> samples, and well liquids do present the potential for exposure, such exposures can be <br /> minimized through personal monitoring and use of prescribed personal protective wear as <br /> described in Section 4. <br /> 3.3 TANK TIGHTNESS TESTING <br /> Chemical exposure is of greatest concern during tank tightness testing activities. This <br /> process often involves direct handling of petroleum products and close proximity to organic <br /> vapors. Most testing techniques require product to be open to the atmosphere thereby <br /> creating the potential for ignition Occasionally, tanks must be uncovered to facilitate <br /> testing. These operations introduce the previously discussed hazards related to excavation. <br /> 3.4 INSTALLATION OF NEW USTS OR SOIL/GROUNDWATER TREATMENT SYSTEMS <br /> The installation of new USTs is usually in clean non--contaminated soils. Thus the likelihood <br /> of chemical hazard during this activity is negligible. If the installation of new USTs, or <br /> more likely,Soil/Groundwater Treatment systems is immediately following the removal and <br /> remediation of soils containing petroleum hydrocarbons, then there is the potential for <br /> health hazards from these operations, and the health and safety protocols described in this <br /> plan shall be implemented. As with UST removal and site characterizations, heavy <br /> equipment is often used and should be considered as a physical hazard. Physicochemical <br /> hazards are not likely but may be present if petroleum products are brought on site. <br /> Groundwater treatment system installation involving product recovery may present the <br /> potential for physicochemical and chemical hazards. Equipment used for pumping of <br /> vapors, product, or severely contaminated groundwater should be certified as intrinsically <br /> safe. <br /> Rev 4/93 3-2 ...)1h-h&s\r)1,mkust h&s <br />