CALIFORNIA AIR RESOURCES BOARD
Lincoln Plaza
Auditorium, First Floor
400 "P" Street
Sacramento, CA
March 15, 1991
9:30 a.m.
AGENDA
Page
91-2-1 Public Meeting to Consider a Status Report on ---
Toxic Air Contaminant Monitoring in California.
91-2-2 Public Meeting to Consider the Annual Report on 001
the Toxic Air Contaminant Identification Program
and Identification List Update.
91-2-3 Public Meeting to Consider the Annual Report on 051
the Status of the Toxic Air Contaminant Control
Measure Development Program.
ITEM NO.: 91-2-2
Public Meeting to consider the Proposed Update to the List of
Substances for the Toxic Air Contaminant Program.
RECOMMENDATION
The staff recommends that the Board approve the proposed
revisions to the list of substances as presented in the Proposed
Update to the List of substances for the Toxic Air Contaminant
Program, February 1991.
DISCUSSION
This report presents the latest update to the list of substances
used in the Board's Toxic Air Contaminant Program. This list
contains: substances identified as Toxic Air Contaminants by the
Board; substances which are under review or nominated for review;
and substances being evaluated for review as candidate Toxic Air
Contaminants.
The list is prepared and used by the staff in setting priorities
for evaluating substances as Toxic Air Contaminants. The first
list was approved by the Board in January 1984 and has been
updated each year thereafter. The proposed list, "Toxic Air
Contaminant Identification List, February 1991," reflects changes
to the February 1990 list.
The proposed revisions are partly based on the addition of 189
Hazardous Air Pollutants to section 112 of the Federal Clean Air
Act. Because Health and Safety Code section 39655 requires that
the Board identify Federal Hazardous Air Pollutants as Toxic Air
Contaminants, Federal Hazardous Air Pollutants not included on
the February 1990 list have been added to the February 1991 list.
In addition to adding substances to the list, category
definitions for the list have been revised to clarify the status
of substances in the program as well as the factors that are
considered prior to reviewing a substance for identification as a
Toxic Air Contaminant.
Hazardous Air Pollutants added to the list were placed in one of
two subcategories based on available California emissions data.
In addition, substances which are not Hazardous Air Pollutants
were added to the list if California emissions data were
available. A determination of whether a substance is emitted in
California was made based on review of air toxics emission
databases.
A request for information and comment on the proposed Toxic Air
Contaminant Identification List of substances was mailed to the
public on December 26, 1990. Staff also requested and received
comments on the proposed revisions to the list from the
Department of Health Services. In addition, the Scientific
Review Panel on Toxic Air Contaminants was notified of the
proposed changes to the list.
SUMMARY AND IMPACTS OF PROPOSED ACTION
The following changes are proposed to the February 1990 Toxic Air
Contaminant Identification List:
Move inorganic arsenic, trichloroethylene, vinyl chloride, and
chloroform from Subcategory IIA to Category I. The purpose of
this change is to reflect the fact that these substances have
been identified by the Board as Toxic Air Contaminants;
Move styrene from Subcategory IIB to Subcategory IIA. The
purpose of this change is to reflect the fact that styrene is
currently under review for identification as a Toxic Air
Contaminant. Styrene was selected for review because is
considered a possible human carcinogen by IARC, significant
amounts of styrene are emitted to the atmosphere in California,
and styrene is detected in the ambient air throughout the state;
Move inorganic lead from Subcategory IIB to Subcategory IIA. The
purpose of this change is to reflect the fact that inorganic lead
is currently under review for identification as a Toxic Air
Contaminant. Inorganic lead was selected for review because it
is considered a possible human carcinogen by IARC, significant
amounts of styrene are emitted to the atmosphere in California,
and styrene is detected in the ambient air throughout the state;
Move inorganic lead from Subcategory IIB to Subcategory IIA. The
purpose of this change is to reflect the fact that inorganic lead
is currently under review for identification as a Toxic Air
Contaminant. Inorganic lead was selected for review because lead
and inorganic lead compounds are considered possible human
carcinogens by IARC, significant amounts of lead and lead
compounds are emitted to the atmosphere in California, and lead
is detected in the ambient air throughout the state;
Move coke-oven emissions from Subcategory IIB to Subcategory
IIIB. The purpose of this change is to reflect the fact that
there are no known emission sources of coke-oven emissions
operating in California;
Revise the definition of Category II to state "Substances
currently under review or nominated for review for identification
as Toxic Air Contaminants;"
Revise Subcategory IIA to state "Substances already in the review
process;"
Revise Subcategory IIB to state "Substances nominated for
review;"
Revise Category III to state "Substances which are being
evaluated for entry into Category II (IIA or IIB). Factors
considered in this evaluation include carcinogenic and non
carcinogenic health effects, emissions and exposure in
California;"
Add Subcategory IIIA which states "Substances known to be emitted
in California (includes Hazardous Air pollutants identified in
the Federal Clean Air Act known to be emitted in California);"
Add Subcategory IIIB which states "Substances identified as
Hazardous Air Pollutants in the Federal Clean Air Act for which
California emissions information is not currently available;" and
Add 170 substances to the February 1990 Toxic Air Contaminant
Identification List: 102 to Subcategory IIIA and 68 to
Subcategory IIIB. With the addition of the new substances, there
are 232 substances on the proposed February 1991 list.
ITEM NO.: 91-2-3
Annual Report on the Status of the Air Toxic Control Measure
Development Program.
RECOMMENDATION
Information only.
DISCUSSION
The staff will give an oral presentation on the status of the
development and implementation of toxic control measures,
highlighting the ARB's accomplishments since the AB 1807 program
began. A recap of actions taken by the Board over the past six
years to implement the toxics program will be discussed, along
with plans for future control activities. The staff annually
updates the Board on the toxics program.