BOARD MEETING DATE: March 1, 2002
AGENDA NO. 26
Notification of OEHHA’s Finalization of Chronic Reference Exposure Levels
SYNOPSIS:
The March 2000 amendments to Rule 1402 – Control of Toxic Air Contaminants from Existing Sources, require that staff notify the Board and affected parties when the state adds chemicals or changes risk values for Toxic Air Contaminants. In December 2001, the Office of Environmental Health Hazard Assessment finalized Chronic Reference Exposure Levels for 13 compounds. At the May 2002 Board meeting, staff will propose amendments to Rule 1401 and report on potential impacts to facilities subject to Rules 1401 and 1402.
RECOMMENDED ACTION:
Receive and file.
Barry R. Wallerstein, D.Env.
Executive Officer
Background
On March 17, 2000, the South Coast Air Quality Management District (AQMD) Governing Board (Board) adopted amendments to Rule 1402 – Control of Toxic Air Contaminants from Existing Sources. In conjunction with the amendments to Rule 1402, the Board directed staff to notify them and affected facilities after the Office of Environmental Health Hazard Assessment (OEHHA) finalizes changes to a Toxic Air Contaminant (TAC) or risk value, and to establish a 12-month lead time (or shorter, if the Board approves another schedule through an official Board action) for using the new TAC or risk value in a risk assessment for Rule 1402. This notification fulfills that Board directive.
OEHHA establishes risk values for TACs and the Scientific Review Panel (SRP) reviews and finalizes these values. Final action is taken when the Director of OEHHA signs the document and posts the information on the internet. The SRP met November 28, 2001 and the Director of OEHHA finalized the Chronic Reference Exposure Levels (RELs) for 13 compounds on December 24, 2001, which was posted on the internet on December 28. The table in Attachment I lists the chemicals with new or revised RELs. Seven compounds have more stringent RELs or did not have an existing draft risk value.
Prior to adding or updating risk values, Rule 1402 also requires staff to report to the Board within 150 days of final action by OEHHA on potential impacts for facilities subject to Rule 1402. Similarly Rule 1401 – New Source Review of Toxic Air Contaminants, also requires an analysis of these same compounds that are used for new source review. A report containing analysis of the impacts of the changes and new RELs on facilities subject to Rules 1401 and 1402 will be presented at the May 2002 Board meeting. For Rule 1401, many of the potential impacts of these chemicals were assessed in previous Board packages. This analysis will include the subset of chemicals that have more stringent risk values or those chemicals that did not have a final risk value for Rules 1401 and 1402.
Attachment I
Chronic Reference Exposure Levels (RELs)
Approved by OEHHA December 2001
| Chemical Name | CAS No. | Screening Value HI=1 (lb/yr) |
New Chronic REL, (µg/m3) |
Industry Use Examples |
| Acrylonitrile1 | 107-13-1 | 1.65E+02 | 5.00E+00 | Production of plastics, surface coatings, nitrile elastomers, barrier resins, and adhesives. |
| beryllium and beryllium compounds1 | 7440-41-7 | 2.31E-01 | 7.00E-03 | Production of space, aircraft, and nuclear industry components. Alloys are used in electrical equipment, precision instruments, and in molds for injection-molded plastics. |
| carbon disulfide | 75-15-0 | 2.65E+04 | 8.00E+02 | Production of viscose rayon fibers and of carbon tetrachloride and cellophane. Also used as a solvent for rubber, sulfur, oils, resins, and waxes. |
| chloropicrin | 76-06-2 | 1.32E+01 | 4.00E-01 | Primarily used as a pre-plant soil fumigant against insects and fungi; it also kills weed and grass seeds when applied to soil. |
| diethanolamine | 111-42-2 | 9.92E+01 | 3.00E+00 | Used in the formation of soaps, emulsifiers, thickeners, wetting agents, and detergents in cosmetic formulations. Also used as a corrosion inhibitor and as a component in textile specialty agents. |
| ethylene dibromide1 | 106-93-4 | 2.65E+01 | 8.00E-01 | Used as a solvent for resins, gums, and waxes, and as a chemical intermediate in the synthesis of dyes and pharmaceuticals. |
| isophrone | 78-59-1 | 6.61E+04 | 2.00E+03 | Used as a solvent in some printing inks, paints, lacquers, adhesives, vinyl resins, copolymers, coatings, finishes, and pesticides. |
| maleic anhydride | 108-31-6 | 2.31E+01 | 7.00E-01 | Used as a co-monomer for unsaturated polyester resins, an ingredient in bonding agents used to manufacture plywood, a corrosion inhibitor, and a preservative in oils and fats. |
Attachment I
(Continued)
Chronic Reference Exposure Levels (RELs)
Approved by OEHHA December 2001
| Chemical Name | CAS No. | Screening Value
HI=1 (lb/yr) |
New Chronic REL, (µg/m3) | Industry Use Examples |
| methyl isocyanate | 624-83-9 | 3.31E+01 | 1.00E+00 | Used as an intermediate in organic synthesis, most notably in the production of carbamate based pesticides. |
| methylene dianiline1 | 101-77-9 | 6.61E+02 | 2.00E+01 | Used as an intermediate in the synthesis of certain isocyanates and polyurethane polymers, as a corrosion inhibitor, in the preparation of azo dyes, as a rubber preservative, and in the curing of epoxy resins and neoprene. |
| selenium and selenium compounds | 7782-49-2 | 6.61E+02 | 2.00E+01 | Used in the glass industry and rubber industries. Alloys are also found in toning baths used in photography and xerography, and in insecticides and photoelectric cells. |
| sulfuric acid | 7664-93-9 | 3.31E+01 | 1.00E+00 | Used in dyes, petroleum refining, for the nitration of explosives, the manufacture of nitrocellulose, caprolactam manufacturing, and as the electrolyte in lead-acid batteries. |
| vinyl acetate | 108-05-4 | 6.61E+03 | 2.00E+02 | Used in water-based paints, adhesives, paper coatings, and applications not requiring service at extreme temperatures. |
1. Chemical is also carcinogenic, which would require
controls at lower emission levels than
what would be required considering
only the chronic impacts.
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