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6. Hazard Assessment This section addresses the potential hazards identified with waste characterization investigation of the site, which includes but is not limited to chemical, physical, and environmental hazards. Additional job hazard information, as obtained subsequent to this plans approval, shall be provided in Appendix 1 of this SSHSP. Hazard characterization of the site and selection of worker protection methods has been determined from previous waste characterizations investigations at other sites and site history. HAZARD ASSESSMENT To provide protection for personnel on-site, the following potential hazards have been identified at the Santa Fe Road Illegal Disposal Site related to the waste characterization investigation: chemical hazards, physical safety hazards, and non-ionizing radiation. This determination is based on information provided related to the contaminants identified at the site and based on the work tasks performed. CHEMICAL HAZARDS A number of chemical hazards of concern that may be present in the soil, groundwater, leachate and landfill gas at the site are discussed below. The information that follows provides a discussion of the hazard concerns that may be present at the site. This SSHSP includes the OSHA permissible exposure limits(PELs)which are the regulatory exposure limits for workplace safety. The PELs are time-weighted average (TWA) exposure concentration. When applicable the short-term exposure limits (STELs), and concentrations in the air that would be immediately dangerous to life or health(IDLH), are also provided. STELs are TWA 15-minute exposure concentrations that should not be exceeded at any time during a workday, even if the 8-hour exposure limit is not exceeded. A. Heavy Metals Bum ash sample analysis obtained from previous waste characterization investigations from other sites indicate that non-hazardous household or municipal waste contains various heavy metals. Test results indicate the predominant metals of concern in burn ash are not readily soluble in water; therefore, not readily leachable into ground water.' However,burn ash can pose a risk if it becomes airborne and is inhaled, ingested, or in direct contact with the skin. The predominant heavy metal associated with burn ash can be found in Table 1 —Heavy Metals; the metals of primary concern include: antimony, arsenic,barium,beryllium, cadmium, total chromium, copper, lead,mercury nickel, selenium, and thallium. Draft Health&Safety Plan-Statewide Burn Dump Investigation,May 2001 Santa Fe Road Disposal Site—Health&Safety Plan 10 October 2002