DEQ-CFW_00058435

November 29, 2016
Dr. Mina Shehee, Supervisor
Medical E. valuation & Risk Assessment Unit
Occupational & Environmental Epidemiology Branch
Division of Public Health
Dept. of Health and Human Services
1912 Mail Service Center
Raleigh NC 27699-1912
Mr. Michael Scott, Director
NC Division of Waste.Management
Dept. of Environmental Quality
1646 Mail Service Center
Raleigh, NC 27699-1.646
Dear Dr. Shehee and Mr. Scou:
As a follow-up to my original email dated June 15, 2016, DWR. requests DPH and DWM review
the enclosed su ' pporting docuinentation and provide comments to DWR on the proposed 02L
standards revisions for the following substances included in Batch #5:
0 p,p-DDE
6 Dinoseb
0 2,4-Dinitrotoluene
0 2,6-Dinitrotoluene
0 Diphenyl ether
0 Diquat
0 Endosulfan Sulfate
Endothall
Ethyl tert-butyl ether
alpha-Hexachlorocyclohexane
beta-Hexachlorocyclohexane
(UVIAC unchanged from 2010)
(IMAC unchanged ftom 2010)
(IMAC established 2011, changes proposed)
(New proposed groundwater standard)
(E\IAC established 2011, changes proposed)
(IMIAC unchanged from 2010)
(ITMAC unchanged from 2011)
(IMIAC unchanged from 2010)
(]MAC established 2011, recommendation pending EPA review)
(UvIAC unchanged from 2011)
(IMAC unchanged from 2011)
DWR has enclosed its documentation for groundwater standard calculation sheets and summary
documents. We welcome your input on these documents.
Please note that the majority of the reviewed standards are unchanged ftom their original value.
Noteworthy changes include a new. proposed groundwater standard for 2,6-dinitrotoluene and
,Stat,� of Noah Carolina 1 Environinefttal QWity I Water Rosowzes
1611 Mail seMca Cimwr M�ngli, Notth Carolina 27699-161 L
919 707 9000
DEQ-CFW-00058435

explanatory text describing conflicting U.S. EPA R.fDs for diquat and endothall. Additionally,
DWR recommends that the cwTent IMAC for ethyl tert-butyl ether be retained until the U.S.
EPA IRIS Program publishes its final assessment. A draft assessment was published on
September 1, 2016. Therefore, there are no supporting documents included in this packet for
ethyl tert-butyl ether -
Please direct inquiries and comments on these proposals before December 22, 2016 to Dr.
Candace Prusiewicz at candace.prusiewicLr�jncdqLiL.
�ov or 919-707-9022,
Thank you for your time and consideration. We look forward to receiving you'r comments.
Sincerely,
Linda Culpepper
Deputy Director
Enclosures
cc: Jay Zimmen-nan, Director DWQ
Jon Risgaard
Tom Fransen
Jeff Manriing
Connie Brower
Chris Ventaloro
Candace Prusiewicz
DEQ-CFW-00058436