Toxicity Criteria for Human Health Risk Assessment

DTSC hosted two informal informal public workshops to explain the proposed rule, and had informal discussions with as well as solicited preliminary input by the public on the proposed rule. The first workshop was held on August 28, 2017 from 2:00 PM to 4:00 PM at 8800 Cal Center Drive, Sacramento, CA, 95826 in the Board Room.

The second workshop was held on August 31, 2017 from 2:00 PM to 4:00 PM at 5796 Corporate Avenue, Cypress, California 90630 in the “All-Staff Room.”

• View the slideshow presentation that was discussed at both informal workshops.
• View the webcast video that was broadcast during the public workshop.

DTSC held a formal APA public hearing on September 20, 2017 from 2:00 PM to 4:00 PM at 8800 Cal Center Drive, Sacramento, California 95826 in the Board Room.

Listen to the audio recording of this meeting.

A written transcript of this audio recording can be made available upon request. Email the request to regs@dtsc.ca.gov.

Official Public Hearing Audio Recording

During the 15-day public comment period, DTSC welcomes comments and questions pertaining to the modified draft proposed regulation and STD 399; the following documents are available for the 15-day public comment period review, which include the comments received from the 45-day comment period, along with DTSC’s responses to those comments:

(The original public notice for the 15-day comment period incorrectly stated that text deleted from the draft proposed regulation is identified with a “double-strikethrough” in the revised draft proposed regulation text. However, the notice should have instead stated that the text deleted from the draft proposed regulation is identified with a “single-strikethrough” in the revised draft proposed regulation text. The corrected public notice for the 15-day comment period is available below)

• Revised 15-Day Public Comment Period Notice of Proposed Action
• Revised Draft Proposed Regulation Text
• Appendix I to the Revised Draft Proposed Regulation Text
• Comments on the Draft Proposed Text
• Draft Responses to Comments on the Draft Proposed Text
• Index to the Draft Responses to Comments on the Draft Proposed Text
• Revised Economic and Fiscal Impact Statement (STD 399)
• Attachment to the Revised Economic and Fiscal Impact Statement (STD 399)

Other Supporting Documents

• Asian Population 2010 Census Publication
• Environmental Council of States 2007 Toxicity Criteria White Paper
• USEPA OSWER Directive #9285.7-53

Table of Contents – Analytes

1. Acetaldehyde
2. Ammonia, Boron Trifluoride, Hydrochloric acid,1,1,1-Trichloroethane
3. Arsenic and Arsine
4. Benzene
5. Benzidine, Bis(2-Chloroethyl)ether, Cadmium, 3,3′-Dichlorobenzidine, 1,4-Dioxane, HCH(Mixed Isomers), Hexachlorobenzene, N-Nitroso-di-n-butylamine, and 2,4,6-Trichlorophenol
6. Polynuclear Aromatic Hydrocarbons
7. Beryllium and compounds
8. Bromoform
9. 1,3-Butadiene
10. 2-Butoxyethanol
11. Carbon Tetrachloride
12. Carbonyl Sulfide
13. Chlordane
14. Chromium VI
15. 1,1 Dichloroethylene, Toluene, and Epichlorohydrin
16. 1,3-Dichloropropene (cis- and trans-)
17. Ethylene Dibromide
18. Formaldehyde, Manganese, Mercury, and Mercuric Chloride
19. Hexachlorodibenzo-p-dioxin mixture
20. Lead and compounds
21. Lead Subacetate, 4,4’Methylene-bis(2-chloroaniline), Mirex, 1-Naphthylamine, o-Toluidine
22. Methylene Chloride
23. Methylene diphenyl diisocyanate and Polymeric MDI
24. Nickel and Nickel Compounds
25. Styrene
26. Tetrachloroethene
27. Toluene 2,4 2,6-Diisocyanates
28. Toxaphene 29. Vinyl Chloride

In response to several requests from the public, the Department of Toxic Substances Control (DTSC) has decided to extend the deadline for public comments on the pre‐rulemaking draft regulation – Toxicity Criteria for Human Health Risk Assessments and Cleanup Decisions. DTSC has decided to push the deadline back to Tuesday, January 31, 2017.

The proposed rulemaking on the toxicity criteria for human health risk‐based screening levels, action levels, and remediation goals would add a new chapter to the California Code of Regulations, Title 22, Division 4.5, Environmental Health Standards for the Management of Hazardous Waste.

• Certified copy of Official Hearing Workshop

• Pre-Rulemaking Workshop PowerPoint Slides
• DTSC Public Notice for EXTENSION of informal comment period

Documents from 45-Day Comment Period Review

• Form 400
• Notice of Proposed Action (NOPA) <– WITH REVISIONS
• Draft Proposed Regulation Text
• Initial Statement of Reasons (ISOR)
• Economic and Fiscal Impact Statement (STD 399)