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~ <br />~ <br />~ <br />3. Chemical Hazards: The health and safety requirements for this site are based <br />on the potential impact to on-site personnel through inhalation, and absorbtion <br />through eyes, and skin. The list below outlines some potential constituents <br />other than particulates that may be encountered during field activities. Each <br />constituent and their corresponding OSHA permissible exposure limits (PEL) <br />based on the Time Weighted Average (TWA), and the Immediately Dangerous <br />to Life or Health (IDLH) levels. <br />CHEMICAL HAZARD EVALUATION <br />~ <br />Constituent <br />Exqosure Limit <br />IDLH <br />Benzene <br />Toluene <br />Ethylbenzene <br />Xylene <br />Ethylene Dibromide <br />Ethylene Dichloride <br />Naphthalene <br />Lead <br />1 ppm <br />100 ppm <br />100 ppm <br />100 ppm <br />20 ppm <br />1 ppm <br />10 ppm <br />0.100 mg/m3 <br />1,000 ppm <br />2000 ppm <br />2000 ppm <br />10,000 ppm <br />400 ppm <br />1,000 ppm <br />500 ppm <br />700 mg/m3 <br />~ <br />~ <br />Note: OSHA Permissible Exposure Limits are 8-hour time-weighted average (TWA) <br />~ concentrations. IDLH values are defined for respirator selection and represent <br />concentration levels that would not pose any escape impairing or irreversible health <br />effects within a 30 minute escape time in case of respirator failure. Concentration <br />~ values are from NIOSH Guide to Chemical Hazards. <br />Knowledge of these potential chemical hazards is used to determine the base <br />~ protective equipment required and action levels at which protective equipment <br />is upgraded to prevent exposure. At this site work will be performed at Level <br />D(described below) and the action level to upgrade to Level C(dermal and <br />~ respiratory protection) will be measurable vapors (using a photo-ionization <br />detector) in the worker breath space that exceed 1 ppm. Measurable levels in <br />excess of 50 ppm will cause work to cease and the HSO to appraise the <br />~ situation and determine when it is safe to return to work. <br />y 4• Potential hazardous wastes (pesticides, solvents, etc.): During the excavation <br />and removal of solid wastes from the work area it is possible that drums or <br />unknown substances which may be hazardous will be uncovered. If this <br />~ occurs, field work in that area will cease. A determination whether the drums <br />or materials can be moved will be made by the HSO (based on indications of <br />4 <br />