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On June 24, 2011, the California Environmental Protection Agency’s (Cal/EPA) Office of Environmental Health Hazard Assessment (OEHHA) published a notice extending the public comment period soliciti

Comment period for notice of proposed rulemaking on the modification of the calculation used to convert estimates of animal cancer potency to estimates of human cancer potency.

The Office of Environmental Health Hazard Assessment (OEHHA) is providing notice of changes made to the proposed regulation: Title 22, California Code of Regulations, sections 69401 through 69406. A copy of the text of the amended proposed regulation is attached.

Addition of α-methyl styrene (CAS No. 98-83-9) to the list of chemicals known to the state to cause reproductive toxicity for purposes of the Safe Drinking Water and Toxic Enforcement Act of 1986.

Notice of proposed rulemaking Title 27, California Code of Regulations proposed amendment of Section 25703(A)(6) quantitative risk assessment to modify the calculation used to convert estimates of animal cancer potency to estimates of human cancer potency. 

Sulfur dioxide listed as known to the state to cause cancer.

The PHG for hexavalent chromium is established at 0.02 parts per billion (ppb). The health-protective level is based on avoidance of potential carcinogenic effects.

The PHG for chromium 6 reflects research documenting that young children and other sensitive subpopulations are more susceptible than the general population to health risks from exposure to carcinogens. The final PHG for hexavalent chromium, also known as chromium 6, is set at 0.02 parts per billion (ppb).

This July 2011 notice announces the beginning of a 60-day public comment period on 39 chemicals which will be discussed at the October 2011 meeting of the Proposition 65 Carcinogen Identification Committee (CIC).

A Maximum Allowable Dose Level (MADL) for chromium (hexavalent compounds) was established.  The amendment will become effective July 29, 2011.