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• Field personnel working in the Exclusion Zone are to work with another person at all times. The subcontractor's representative can serve as the second person while the work is being conducted in the field. 3.2 Hygiene Requirements • Long hair will be secured away from the face so it does not interfere with any activities. • Eating, drinking, chewing gum or tobacco, smoking, or any practice that increases the probability of hand-to-mouth transfer and ingestion of material is prohibited in any area designated as being potentially affected by site related chemicals. • Hands and face must be thoroughly washed upon leaving the work area, and before eating, drinking, or other non-project activities. • Personnel leaving potentially contaminated areas will shower (including washing hair) and change to clean clothing as soon as possible after leaving the site. • Kneeling, sitting, leaning, or general contact with potentially affected surfaces or with surfaces suspected of being potentially affected by hazardous materials (i.e., puddles, mud, leachate, etc.) should be avoided. • Medicine and alcohol can potentiate the effects of exposure to toxic chemicals. Neither should be taken by personnel if the likelihood of risk exists. Ingestion of alcohol during and immediately prior to field activities is prohibited. 4.0 HAZARD EVALUATION A preliminary hazard evaluation was performed to identify existing site conditions and is documented in Table 4. The preliminary hazard evaluation addressed the following, where applicable: • Identification of the suspected hazardous materials/wastes on-site; • Toxicological aspects of the suspected hazardous materials on-site; • Suspected chemical/elemental concentrations within the various media on-site; • Inherent site hazards; • Operational hazards; and • Climate extremes. 4.1 Suspected Chemical/Elemental Hazards To select those contaminants that may cause health and safety concerns, henceforth referred to as potential Contaminants of Concern (CDCs), a review of the site remediation and sampling history was performed. Based on this review, potential COCs were selected and are listed in Table 5. Chemical information for each of the potential COCs are provided in the NIOSH Pocket Guide pages located in Appendix C. Information from the NIOSH Pocket Guide (e.g., flash point, water reactive, etc.) has been used in performing the chemical hazard analysis in Table 5 (e.g., fire, inhalation, reactivity, and skin absorption hazards). If, based on the hazard analysis, chemical hazards exist, hazard mitigatory 13