BOARD MEETING DATE: May 19, 2000 AGENDA NO. 39
Notification of OEHHA's Finalization of Chronic Reference Exposure Levels
SYNOPSIS:
Recent amendments to Rule 1402 - Control of Toxic Air Contaminants From Existing Sources require that staff notify the Governing Board and affected parties when the state adds chemicals or changes risk values for toxic air contaminants. In February and April, 2000, Office of Environmental Health & Hazard Assessment finalized Chronic Reference Exposure Levels (RELs) for 39 compounds. Staff will analyze the potential impacts of these changes for Rules 1401 and 1402 and report back to the Board at the August Board meeting.
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 revisions to Rule 1402 - Control of Toxic Air Contaminants from Existing Sources. In conjunction with the amendments to Rule 1402, the Governing Board directed staff to promptly notify the Governing Board and affected facilities after 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.
The Office of Environmental Health Hazard Assessment (OEHHA) establishes risk values for TACs. The Scientific Review Panel (SRP) reviews and finalizes these values, which is considered the final action by the state. In February and April, 2000, the SRP met and finalized Chronic Reference Exposure Levels (RELs) for 39 compounds (76 individual chemicals). The table in Attachment I lists the chemicals with new or revised RELs. Sixteen compounds have more stringent RELs or did not have a previous draft risk value.
Rule 1402 also requires that staff provide a report to the Governing Board within 150 days of final action by OEHHA before new or updated risk factors are used. 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 August Governing 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 Rule 1401. For Rule 1402, all of these chemicals will be evaluated.
Attachment
Chronic RELs Finalized by OEHHA, February and April 2000
ATTACHMENT I
Chronic Reference Exposure Levels (RELs) Finalized by OEHHA
February & April 2000
|
Chronic REL, µ/m3* | |||
|
Chemical Name |
CAS No. |
Existing ** |
Final |
|
ammonia |
7664-41-7 |
1.00E+02 |
2.00E+02 |
|
benzene |
71-43-2 |
7.10E+01 |
6.00E+01 |
|
chlorine |
7782-50-5 |
7.10E+00 |
2.00E-01 |
|
chloroform |
67-66-3 |
3.50E+01 |
3.00E+02 |
|
dibenzo-p-dioxins (chlorinated) | |||
|
tetrachlorodibenzo-p-dioxin, 2,3,7,8- |
1746-01-6 |
3.50E-06 |
4.00E-05 |
|
pentachlorodibenzo-p-dioxin, 1,2,3,7,8- |
40321-76-4 |
3.50E-06 |
8.00E-05 |
|
hexachlorodibenzo-p-dioxin, 1,2,3,4,7,8- |
39227-28-6 |
3.50E-06 |
4.00E-04 |
|
hexachlorodibenzo-p-dioxin, 1,2,3,6,7,8- |
57653-85-7 |
3.50E-06 |
4.00E-04 |
|
hexachlorodibenzo-p-dioxin, 1,2,3,7,8,9- |
19408-74-3 |
3.50E-06 |
4.00E-04 |
|
heptachlorodibenzo-p-dioxin, 1,2,3,4,6,7,8- |
35822-46-9 |
3.50E-06 |
4.00E-03 |
|
octachlorodibenzo-p-dioxin, 1,2,3,4,5,6,7,8- |
3268-87-9 |
3.50E-06 |
4.00E-02 |
|
total tetrachlorodibenzo-p-dioxin |
41903-57-5 |
3.50E-06 |
4.00E-05 |
|
total pentachlorodibenzo-p-dioxin |
36088-22-9 |
3.50E-06 |
8.00E-05 |
|
total hexachlorodibenzo-p-dioxin |
34465-46-8 |
3.50E-06 |
4.00E-04 |
|
total heptachlorodibenzo-p-dioxin |
37871-00-4 |
3.50E-06 |
4.00E-03 |
|
total dioxins, with individual isomers rptd. |
3.50E-06 |
4.00E-05 |
|
|
total dioxins, without individual isomers rptd. |
3.50E-06 |
4.00E-05 |
|
|
dibenzofurans (chlorinated) | |||
|
tetrachlorodibenzofuran, 2,3,7,8- |
51207-31-9 |
3.50E-06 |
4.00E-04 |
|
pentachlorodibenzofuran, 1,2,3,7,8- |
57117-41-6 |
3.50E-06 |
8.00E-04 |
|
pentachlorodibenzofuran, 2,3,4,7,8- |
57117-31-4 |
3.50E-06 |
8.00E-05 |
|
hexachlorodibenzofuran, 1,2,3,4,7,8- |
70648-26-9 |
3.50E-06 |
4.00E-04 |
|
hexachlorodibenzofuran, 1,2,3,6,7,8- |
57117-44-9 |
3.50E-06 |
4.00E-04 |
|
hexachlorodibenzofuran, 1,2,3,7,8,9- |
72918-21-9 |
3.50E-06 |
4.00E-04 |
|
hexachlorodibenzofuran, 2,3,4,6,7,8- |
60851-34-5 |
3.50E-06 |
4.00E-04 |
|
heptachlorodibenzofuran, 1,2,3,4,6,7,8- |
67562-39-4 |
3.50E-06 |
4.00E-03 |
|
heptachlorodibenzofuran, 1,2,3,4,7,8,9- |
55673-89-7 |
3.50E-06 |
4.00E-03 |
|
octachlorodibenzofuran, 1,2,3,4,5,6,7,8- |
39001-02-0 |
3.50E-06 |
4.00E-02 |
|
total tetrachlorodibenzofuran |
55722-27-5 |
3.50E-06 |
4.00E-04 |
|
total pentachlorodibenzofuran |
30402-15-4 |
3.50E-06 |
8.00E-05 |
|
total hexachlorodibenzofuran |
55684-94-1 |
3.50E-06 |
4.00E-04 |
|
total heptachlorodibenzofuran |
38998-75-3 |
3.50E-06 |
4.00E-03 |
|
dioxane (1,4-) |
123-91-1 |
4.00E+00 |
3.00E+03 |
|
ethyl benzene |
100-41-4 |
--- |
2.00E+03 |
|
ethyl chloride |
75-00-3 |
1.00E+04 |
3.00E+04 |
|
ethylene glycol |
107-21-1 |
4.00E+02 |
|
|
ethylene glycol ethyl ether |
110-80-5 |
2.00E+02 |
7.00E+01 |
|
ethylene glycol ethyl ether acetate |
111-15-9 |
6.40E+01 |
3.00E+02 |
*
Lower values are more stringent.
** Existing REL based on the values in the
"California Air Pollution Control Officers Association (CAPCOA) Air Toxic
‘Hot Spots’ Program", October 1993. Existing draft RELs are not used in
Rule 1401.
ATTACHMENT I
(Continued)
|
Chronic REL, µ/m3* | |||
|
Chemical Name |
CAS No. |
Existing ** |
New |
|
ethylene glycol methyl ether |
109-86-4 |
2.00E+01 |
6.00E+01 |
|
ethylene glycol methyl ether acetate |
110-49-6 |
5.70E+01 |
9.00E+01 |
|
formaldehyde |
50-00-0 |
3.60E+00 |
3.00E+00 |
|
hexane (n-) |
110-54-3 |
7.00E+03 |
|
|
hydrogen cyanide |
74-90-8 |
7.00E+01 |
9.00E+00 |
|
hydrogen sulfide |
7783-06-4 |
4.20E+01 |
1.00E+01 |
|
hydrogen chloride (hydrochloric acid) |
7647-01-0 |
7.00E+00 |
9.00E+00 |
|
isopropanol |
67-63-0 |
--- |
7.00E+03 |
|
manganese and manganese compounds |
4.00E-01 |
2.00E-01 |
|
|
mercury & mercury comp. (inorganic) |
7439-97-6 |
3.00E-01 |
9.00E-02 |
|
mecuric chloride |
7487-94-7 |
--- |
9.00E-02 |
|
methyl mercury |
593-74-8 |
--- |
9.00E-02 |
|
methanol |
67-56-1 |
6.20E+02 |
4.00E+03 |
|
methyl bromide |
74-83-9 |
6.00E+00 |
5.00E+00 |
|
methyl chloroform (1,1,1 TCA) |
71-55-6 |
3.20E+02 |
1.00E+03 |
|
methyl t-butyl ether |
1634-04-4 |
--- |
8.00E+03 |
|
methylene chloride |
75-09-2 |
3.00E+03 |
4.00E+02 |
|
napthalene |
91-20-3 |
1.40E+01 |
9.00E+00 |
|
nickel & Ni comp. (ex. nickel oxide) |
7440-02-0 |
2.40E-01 |
5.00E-02 |
|
nickel acetate |
373-02-4 |
2.40E-01 |
5.00E-02 |
|
nickel carbonate |
3333-67-3 |
2.40E-01 |
5.00E-02 |
|
nickel carbonyl |
13463-39-3 |
2.40E-01 |
5.00E-02 |
|
nickel hydroxide |
12054-48-7 |
2.40E-01 |
5.00E-02 |
|
nickelocene |
1271-28-9 |
2.40E-01 |
5.00E-02 |
|
nickel refinery dust |
2.40E-01 |
5.00E-02 |
|
|
nickel subsulfide |
120-35-72-2 |
2.40E-01 |
5.00E-02 |
|
nickel oxide |
1313-99-1 |
--- |
1.00E-01 |
|
phenol |
108-95-2 |
4.50E+01 |
2.00E+02 |
|
phosphoric acid |
7664-38-2 |
--- |
7.00E+00 |
|
propylene |
115-07-1 |
3.00E+03 |
|
|
propylene glycol monomethyl ether |
107-98-2 |
--- |
7.00E+03 |
|
propylene oxide |
75-56-9 |
3.00E+01 |
3.00E+01 |
|
styrene |
100-42-5 |
7.00E+02 |
9.00E+02 |
|
toluene |
108-88-3 |
2.00E+02 |
3.00E+02 |
|
trichloroethylene |
79-01-6 |
6.40E+02 |
6.00E+02 |
|
xylenes (mixtures and isomers) |
1330-20-7 |
3.00E+02 |
7.00E+02 |
|
xylenes, m- |
108-38-3 |
3.00E+02 |
7.00E+02 |
|
xylenes, o- |
95-47-6 |
3.00E+02 |
7.00E+02 |
|
xylenes, p- |
106-42-3 |
3.00E+02 |
7.00E+02 |
*
Lower values are more stringent./ / /