Announcement of Revised Groundwater Rules: |
This notice is to inform you that the following revisions to 15A NCAC 02L .0202 Groundwater Quality Standards become effective January 1, 2010.
In Section .0202(c):
- “concentrations at or above the practical quantitation limit” was added to the text to clarify the meaning of “detection".
In Section .0202(g):
- Units of measure were changed from milligrams per liter (ppm) to micrograms per liter (ppb), except where otherwise noted;
- Standards were rounded to one scientifically significant figure, where appropriate;
- The groundwater standard for endrin and total endrin was combined into one total endrin standard;
- A formaldehyde standard was added;
- Seven interim maximum allowable concentrations (IMACs) were added as permanent standards--benzoic acid, bis(chloroethyl)ether, dibromochloromethane, ethyl acetate, hexachlorobutadiene, 1,1,2,2-tetrachloroethane, 1,2,4-trichlorobenzene;
- The standard for fourteen substances was made more stringent (arsenic; barium; chromium; 1,1-dichloroethane; 1,4-dioxane; lindane; methyl tert-butyl ether; naphthalene; petroleum aliphatic carbon fraction class C9-C18; petroleum aliphatic carbon fraction class C19-C36; phenol; selenium; styrene; toluene).
- The standard for twelve substances was made less stringent (acetone, boron; butylbenzyl phthalate; 1, 2-dibromo-3-chloropropane; 1,4-dichlorobenzene; 1,2-dichloropropane; 1,3-dichloropropene; ethylene dibromide; 2-methylnaphthalene; 3-methylphenol; 4-methyphenol; vinyl chloride).
- The chemical names for ten substances were updated to the term most commonly used by analytical laboratories and EPA databases as follows:
- Di (2-ethylhexyl) phthalate is now listed as bis(2-ethylhexyl) phthalate;
- Di-n-butyl phthalate is now listed as dibutyl phthalate (di-n-butyl phthalate);
- Orthodichlorobenzene is now listed as 1,2‑dichlorobenzene (orthodichlorobenzene);
- Metadichlorobenzene is now listed 1,3‑dichlorobenzene (metadichlorobenzene);
- Paradichlorobenzene is now listed as 1,4‑dichlorobenzene (paradichlorobenzene);
- Cis-1,2-dichloroethene is now listed as 1,2-dichloroethene (cis);
- trans-1,2-dichloroethene is now listed as 1,2-dichloroethene (trans);
- p-dioxane is now listed as 1,4-dioxane (p-dioxane);
- Diphenyl is now listed as 1,1-diphenyl (1,1-biphenyl);
- Endosulfan II is now listed as endosulfan because the standard is based on a technical mixture of alpha and beta isomers (endosulfan II is the beta isomer).
The revised 15A NCAC 02L .0202 rule is located on the Division of Water Quality’s Web site at http://h2o.enr.state.nc.us/csu/ . It will be available in the NC Administrative Code in January 2010 at http://reports.oah.state.nc.us/ncac.asp .
For additional information please contact Sandra Moore at Sandra.moore@ncdenr.gov or (919) 807-6417. You may also contact Connie Brower at connie.brower@ncdenr.gov or (191) 807-6416.
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