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Thank you for your work to improve air quality and protect public health. We look forward to continued work with you and your staff to implement the 2010 health-based SO₂ standard. For additional information regarding these designations, please visit our website at https://www.epa.gov/sulfur-dioxide-designations/.
If you have further questions or concerns, please contact me or your staff may call Mark Rupp, Deputy Associate Administrator for Intergovernmental Relations, at rupp.mark@epa.gov or at (202) 564-7178.
Sincerely,
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Gina McCarthy
Enclosure
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Butylbenzyl Phthalate
Benzo(b)fluoranthene
Benzo(k)fluoranthene
Bis(2-Chloroethyl) Ether
Hexachlorocyclohexane (HCH)- Technical
1,3-Dichloropropene
2,4-Dinitrotoluene
Nitrosamines
Nitrosodibutylamine, N
Nitrosodiethylamine, N
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13) Table 3: The proposed revisions include the removal of criteria for several chemical families. These chemical families are listed as “headings” in D.C.’s current regulations with individual chemicals and criteria for those chemicals listed below the headings. DOEE proposes to remove the chemical family names and as...
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Constituentᵃ, Organics (µg/L) CAS Number Criteria for Classes
C D²
CCC 4-Day Avg CMC 1-Hour Avg 30-Day Avg
Chlorinated benzenes (except Di) 25.0
Chlorinated ethanes 50
Chloroalkyl ethers 1000
Dichloroethylenes 1000
Dichloropropenes 400
Endosulfan 0.056 0.22 89
Halomethanes 1000
Naphthalene 91203 600
Nitrophenols 20
Phthalate esters 100
Footnote ᵃ: For constituents with blank numeric criteria, EPA has not calculated standards at this time. However, permit authorities will address constituents in NPDES permit actions using narrative criteria for toxics.
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EPA notes that the removal of several chemical family names that previously did not have a criterion associated with them and solely functioned as a heading is appropriate and does not require approval under Clean Water Act § 303(c). EPA notes that DOEE should continue to cover these chemical families and other unnamed...
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numeric criteria through their narrative criteria for toxics, as indicated by footnote a in Table 3. Those chemical families include:
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Constituentᵃ, Organics (μg/L) CAS Number Criteria for Classes
C D²
CCC 4-Day Avg CMC 1-Hour Avg 30-Day Avg
Chlorinated naphthalene
Chlorinated phenols
Carbamates
Organochlorides
Organophosphates
Polynuclear aromatic hydrocarbons
Acenaphthylene
Footnote ᵃ: For constituents with blank numeric criteria, EPA has not calculated standards at this time. However, permit authorities will address constituents in NPDES permit actions using narrative criteria for toxics.
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Section 7 of the Endangered Species Act (ESA) requires that all Federal agencies ensure that any covered action, (including any approval or disapproval action under CWA Section 303(c)) is not likely to jeopardize the continued existence of any threatened or endangered species, or to result in the destruction or adverse...
Thank you for the opportunity to provide written comments on DOEE’s notice of proposed rulemaking and public comment period concerning the 2016 Triennial Review of D.C. Water Quality Standards. Please note that the comments addressed above are preliminary in nature and do not constitute a determination by EPA under Cle...
Sincerely,