TABLE OF MHRVs FOR MULTIMEDIA EXPOSURE TO AIR TOXICS

The heading for each item contains the chemical name and, in parenthesis, the CAS RN. Each item lists the MHRV and the variables necessary for the equation. The equations used to develop the MHRV are designated as follows: "A" means applying the equation under part 4717.8350 for noncarcinogenic effects of toxicants and "B" means applying the equation under part 4717.8450 for carcinogens. The endpoint of concern is listed for use in determining a cancer index under part 4717.8550 or a hazard index under part 4717.8600 . TABLE OF MHRVs A. Antimony (7440-36-0) MHRV (µg/kg-day) 0.4 Endpoint of concern Hematologic system Equation A LOAEL (mg/kg-day) 3.5E-1 Uncertainty factor 1,000 B. Arsenic (7440-38-2) MHRV (µg/kg-day) 0.007 Endpoint of concern Cancer Equation B Potency slope [mg/kg-day] -1 1.5 C. Benzo[a]pyrene (50-32-8) MHRV (µg/kg-day) 0.001 Endpoint of concern Cancer Equation B Potency slope [mg/kg-day] -1 7.3 D. Cadmium (7440-43-9) MHRV (µg/kg-day) 0.5 Endpoint of concern Renal system Equation A NOAEL (mg/kg-day) 5E-3 Uncertainty factor 10 E. Manganese (7439-96-5) MHRV (µg/kg-day) 140 Endpoint of concern Nervous system Equation A NOAEL (mg/kg-day) 1.4E-1 Uncertainty factor 1 F. Methylmercury (22967-92-6) MHRV (µg/kg-day) 0.1 Endpoint of concern Nervous system and developmental Equation A BMD (mg/kg-day) 1E-3 Uncertainty factor 10 G. Nickel (7440-02-0) MHRV (µg/kg-day) 20 Endpoint of concern Decreased body and organ weights Equation A NOAEL (mg/kg-day) 5 Uncertainty factor 300 H. Polychlorinated biphenyls (PCB) (1336-36-3) MHRV (µg/kg-day) 0.05 Endpoint of return Developmental Equation A LOAEL (mg/kg-day) 5E-4 Uncertainty factor 10