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SITE HEALTH & SAFETY PLAN <br /> 4.6 MEDICAL SURVEILLANCE <br /> All Geomatrix project site personnel shall participate in the Geomatrix medical surveillance <br /> program, which includes annual audiometric and physical examinations for employees involved <br /> in hazardous waste or materials projects. It requires that all such personnel have medical <br /> clearance before being issued a respirator and participating in field activities. Frequency of <br /> medical examinations, which complies with 29CFR 1910.120 (0) and CCR8 5192(f3), occurs: <br /> 1. Prior to performing field work; <br /> 2. At least once every 12 months; <br /> 3. At termination of employment; <br /> 4. Upon occurrence of possible over-exposure; <br /> 5. More frequently if deemed necessary by a physician. <br /> 5.0 HAZARD ASSESSMENT <br /> An assessment of the potential hazards that may be encountered during field activities at the site <br /> are designated by field task in Table 5.0 and discussed below. <br /> 5.1 POTENTIAL CHEMICAL HAZARD5 AT SITE <br /> Listed below are hazardous substances that have been found or are suspected to be present at the <br /> site. Additional information on these chemicals, including their acute effects, are included in <br /> chemical information sheets attached at the end of this Plan. <br /> Hazardous Substances Known or Suspected at Site: <br /> Chemical Media Maximum Concentration Routes of Exposure <br /> Found (inhalation, dermal,ingestion) <br /> Ammonia Water 896 mg/1I Inhalation, dermal, ingestion <br /> Sulfolane Water 520 Inhalation, dermal, ingestion <br /> 1,1,1-Trichloroethane Water 0.7 Inhalation, dermal, ingestion <br /> Trichloroethene Water 16 2 Inhalation, dermal, in estion <br /> 1 Value given is for ammonium ion, which is not hazardous. Gaseous form(ammonia)will only occur if pH of <br /> water is above 8 (pH of groundwater is typically less than 7 at site). <br /> 2 Value given is from leachate collection sump. TCE has not been reported in any monitoring wells. <br /> Chemical information sheets are attached for hazardous substances listed. <br /> Air monitoring requirements and action levels related to potential chemical hazards at the site are <br /> discussed in Section 6.0. <br /> I TROJECI\6741.000\6741-07.doc 5 <br />