South Coast Air Quality Management District

BOARD MEETING DATE: November 1, 2002 AGENDA NO. 29

REPORT:

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. On September 3, 2002, the Office of Environmental Health Hazard Assessment finalized Chronic Reference Exposure Levels for two compounds. At the January 2003 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 AQMD 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 relative to the most recent applicable OEAHHA action.

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 July 26, 2002 and the Director of OEHHA finalized the Chronic Reference Exposure Levels (RELs) for two compounds on September 3, 2002; the internet posting also occurred on September 3, 2002^,.

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 January 2003 Board meeting.

Table I lists the two chemicals, which each have an REL more stringent than previously analyzed relative to the July 1998 amendments to Rule 1401.

Table I

Chronic Reference Exposure Levels (RELs)
Approved by OEHHA September 2002

Chemical Name	CAS No.	New Chronic REL, (µg/m³)	Screening Value HI=1 (lb/yr)*	Industry Use Examples
phosphine	7803-51-2	0.8	26.5	Agricultural fumigant; semiconductor industry as a chemical doping agent; and chemical synthesis in preparations of phosphonium halides, for polymerization initiation, and as condensation catalysts.
triethylamine	121-44-8	200	6,610	Cross-linking catalyst in the production of polyurethane foam in the manufacture of cores for metal castings; catalyst for epoxy resins; and corrosion inhibitor for polymers.

*Receptor distance of 25 meters.

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This page updated: August 11, 2004
URL: http://www.aqmd.gov/hb/2002/021129a.html