Office of Environmental Health Hazard Assessment

Children's Health at OEHHA

Child- Specific Reference Dose - Notice of the Extension of the Public Comment Period on the Child-Specific Reference Dose (chRD) for Paraquat for use in Assessing Health Risks at Existing and Proposed School Sites

The Office of Environmental Health Hazard Assessment (OEHHA) received a request to extend the comment period on the draft report, Development of Health Criteria for School Site Risk Assessment Pursuant to Health and Safety Code (HSC) Section 901(g): PROPOSED CHILD-SPECIFIC REFERENCE DOSE (chRD) FOR PARAQUAT.  After careful consideration for providing adequate time for the review and comment and to finalize the document in a timely fashion, OEHHA has decided to extend the end of the comment period from January 22, 2010 to February 22, 2010

The draft report can be downloaded from the OEHHA website at requests that written comments on this draft report be submitted by 5:00 PM, February 22, 2010.  Comments can be submitted using the address, fax number, or email address below.  If you would like to receive further information on this announcement or have questions, please contact our office at (916) 324-2829 or the address below. 

HSC §901(g) requires the Office of Environmental Health Hazard Assessment (OEHHA), in consultation with the appropriate entities within the California Environmental Protection Agency, to identify those chemical contaminants commonly found at school sites and determined by OEHHA to be of greatest concern based on child-specific physiological sensitivities.  HSC 901(g) also requires OEHHA to annually evaluate and publish, as appropriate, numerical health guidance values (HGVs) or chRDs for those chemical contaminants.  

The draft chRD for paraquat being considered at this time is 7 x 10‑5 mg/kg-day.  In developing the chRD, OEHHA selected two young animal studies and two adult animal studies.  Collectively these studies paint a cohesive picture that paraquat is a neurotoxicant and impacts brain functions.  The chRD is based on the lowest observed adverse effect level (LOAEL) of 0.07 mg/kg-day from one of the studies.

A public workshop will also be held from 10:00 AM to 12:00 PM on January 13, 2010, in the Conference Room 230 on the second floor of the Joe Serna (Cal/EPA headquarters) Building, 1001 I Street, Sacramento.  Oral and written comments received at the workshop and during the comment period will be considered during the revision of the draft document.  Because there will be no official transcript of the meeting, we recommend that oral comments also be submitted in writing. 

Mr. Leon Surgeon
Integrated Risk Assessment Branch
Office of Environmental Health Hazard Assessment
P.O. Box 4010
1001 I Street, MS-12B
Sacramento, California 95812-4010
FAX: (916) 322-9705


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