DEQ-CFW_00053328

From: Regan, Michael S [/O=EXCHANGELABS/OU=EXCHANGE ADMINISTRATIVE GROUP
(FYDIBOHF23SPDLT)/CN=RECIPIENTS/CN=BE7CDFFAD666484FBBCE36570340F33B-MSREGAN]
Sent: 7/22/2017 5:33:22 PM
To: Holman, Sheila [/o=ExchangeLabs/ou=Exchange Administrative Group
(FYDIBOHF23SPDLT)/cn=Recipients/cn=94a3f69674d34b769b3bd834a97105c5-scholman]
Subject: RE: Permitting process
Very helpful ... have questions on the time for issuing so will call later
Michael S. Regan
Secretary
NC Department of Environmental Quality
919.707.8622 office
[e-mail]
IMENEMEMEM
Sent: Saturday, July 22, 2017 1:22 PM
To: Regan, Michael S <[e-mail]>
Subject: Permitting process
NC Administrative Code requires (15A NCAC 02H .0101) a permit for control of sources of water pollution by providing
the requirements and procedures for application and issuance of state NPDES permits for a discharge from an outlet,
point source, or disposal system discharging to the surface waters of the state. These rules reflect: Federal NPDES
permitting laws under 40 CFR 122 which the State implements.
Major industrial discharges, Such as Chernours, are required to complete EPA NPDES applications which require a certain
amount of sampling as described in 48 FR 14153, Apr 1, 1983. Applicants evaluate effluent for priority pollutants as
defined by EPA. Link to application forms: tt :0 :ta r ,p-�D]Jtflr z::�p l q t:€ ns
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EPA has established effluent guidelines for over 57 different types of Industrial categories. Chernours is subject to the
Organic Chemicals, Plastics, and Synthetic Fibers (OCPSF) Point: Source Category (40 CFP Part 41.4), Each industrial
applicant must characterize their wastestrearns (define each source and provide test analysis of the contaminants
contained in each wastestrearn). The applicant is required to give the discharge volume of each wastestrearn and what
treatment will be provided to rneet: State and Federal Standards for the receiving stream to which they propose to
discharge.
The applicant may be required to perform a model for its oxygen consurning wastes to protect dissolved oxygen in the
stream. Also, depending on the receiving stream classification (use) they may have to perform a treatability study to
confirm treatment levels and/or a nutrient response model to protect Nutrient Sensitive Waters.
Federal Categorical Guidelines often have set technology based effluent limitations that NPDES puts in the permit. In
addition, limits and/or monitoring; for pollutants of concern for particular types of wastewaters are plat in the permit.
And last, the discharge characterization supplied in the application (each chernical sampled per the list supplied by EPA)
is compared against State and Federal Standards or Criteria to see if there is potential to violate any standards, criteria.
If so, additional limitations are added to the permit.
If the perrnittee identifies a unique contaminant:, NPDES reviews EPA databases for guidance on how td:3 regulate tale
contaminant. As described in rule 1.5A NCAC 02B .0208 "For carcinogens, the concentrations of toxic substances shall
not result in unacceptable health risks and [...] An unacceptable health risk for cancer shall be considered to be more
than one case of cancer per one million people exposed [1-5 risk level],.." Therefore if EPA has a study that has
determined this risk level, than this is the concentration NPDES would use to determine a NPDES permit limitation.
The draft permit is sent to public notice, EPA, and the permittee - all at the same time for a minimum of thirty days.
Anyone car) cornment or request a hearing. If no hearing; is requested the permit can be issued 15 days after the end of
the public; notice period provided any changes made to address comments are not significant: (do not make the permit:
less stringent).
HolmanSheila
NCIDEQ
1601 Mail Service Center
Raleigh, NC 6.. si
Phone: ' • 1.-:6a
' '707-8619
e .I •♦
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