NC0003433_Fact Sheet_20200820

Fact Sheet
NPDES Permit No. NCO003433
Permit Writer/Email Contact: Sergei Chernikov, Ph.D., [e-mail]:
Date: May 27, 2020
Division/Branch: NC Division of Water Resources/NPDES Complex Permitting
Fact Sheet Template: Version 09Jan2017
Permitting Action:
❑ Renewal
❑ Renewal with Expansion
❑ New Discharge
❑X Modification (Fact Sheet should be tailored to mod request)
Note: A complete application should include the following:
• For New Dischargers, EPA Form 2A or 2D requirements, Engineering Alternatives Analysis, Fee
• For Existing Dischargers (POTW), EPA Form 2A, 3 effluent pollutant scans, 4 2nd species WET
tests.
For Existing Dischargers (Non-POTW), EPA Form 2C with correct analytical requirements based
on industry category.
Complete applicable sections below. If not applicable, enter NA.
1. Basic Facility Information
Facility Information
Applicant/Facility Name:
Duke Energy Progress LLC — Cape Fear Steam Electric Plant
Applicant Address:
500 CP&L Road, Moncure, NC 27599
Facility Address:
500 CP&L Road, Moncure, NC 27599
Permitted Flow:
Outfall 007 — 0.73 MGD Daily Maximum
Outfall 008 — 0.72 MGD Daily Maximum
Outfall 009 — 0.005 MGD Daily Maximum
Facility Type/Waste:
100% Industrial (Ash basin clean up, remediation)
Facility Class:
Grade I Physical Chemical WPCS
County:
Chatham
Region
Raleigh
Briefly describe the proposed permitting action and facility background.- Duke Energy Progress LLC
(Permittee) has requested a permit modification and submitted a modification request on March 17,
2020. The permit is being modified to add an Emergency Spillway for the 1963/1970 inactive ash basin.
The new Emergency Spillway will be designated as Outfall 008B, it will be adjacent to Outfall 008A.
The monitoring will be waived due to unsafe conditions associated with sampling during an overflow
event. The location of new Outfall is described in Table 2.
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Table 2. Outfall 008B Location
Coordinates
Latitude: 35°34'57.37" N
Longitude:-79°02'57.50" W
The new Emergency Spillway is needed to comply with the new Dam Safety regulations for ash basin
dams passed in Apri12019. The current regulatory design storm has been updated from 0.5 Probable
Maximum Flood (PMF) to the full PMF. The full PMF equates to 27.5 inches of rainfall in 6-hour period.
In order to safely pass the full PMF a new auxiliary emergency overflow spillway is required to be
constructed to release stormwater to the Cape Fear River.
2. Receiving Waterbody Information:
Table 3.
Receiving Stream
Index
7Q10s
(cfs)
QA
(cfs)
IWC
(7Q10s)
Outfall 007 — Unnamed tributary to Cape Fear River
18-(1)
0
0
100%
Outfalls 008 — Cape Fear River
18-(1)
65
3,170
1.7%
Outfall 009 — Cape Fear River
18-(1)
65
3,170
0.012%
Outfall 008A — Cape Fear River
Outfalls 001 & 005— Internal Outfalls
Stream Classification:
WS-IV
Regional Office:
Raleigh
303(d) Listed?:
No
USGS Topo Quad:
E22SE Moncure, NC
I UC No.:
03030002
Permit Writer:
Sergei Chernikov, Ph.D.
Subbasin:
03-06-07
Date:
May 27, 2020
Cape Fear River Stream Statistics
— 2016
law
Drainage (mi2):
-
Summer — 7Q 10 (cfs):
65 '
Winter — 7Q 10 (cfs):
89,
30Q2 (cfs):
150'
QA (cfs):
3,1701
1. Based on USGS recommendation and data
3. Instream Monitoring
Instream monitoring may be required in certain situations, for example: 1) to verify model predictions
when model results for instream DO are within 1 mg/1 of instream standard at full permitted flow; 2) to
verify model predictions for outfall diffuser; 3) to provide data for future TMDL; 4) based on other
instream concerns. Instream monitoring may be conducted by the Permittee, and there are also
Monitoring Coalitions established in several basins that conduct instream sampling for the Permittee (in
which case instream monitoring is waived in the permit as long as coalition membership is maintained).
If applicable, summarize what instream monitoring will be proposed for this permit action: The current
permit requires instream monitoring for total arsenic, total selenium, total mercury, total chromium,
dissolved lead, dissolved cadmium, dissolved copper, dissolved zinc, total bromide, total hardness (as
CaCO3), temperature, turbidity, and total dissolved solids (TDS) at locations specified in Table 4:
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Instream sampling location descriptions are shown in Table 4.
Table 4. Instream Sampling Locations Description
Instream Sample Description
Location
Upstream Outfall 008
0.9 miles upstream from Outfall 008A in Cape Fear River
Downstream Outfall 008
Approximately 250 meters downstream from Outfall 008 in
Cape Fear River
Is this facility a member of a Monitoring Coalition with waived instream monitoring (YIN): NO
Name of Monitoring Coalition: NA
4. Antidegradation Review (New/Expanding Discharge):
The objective of an antidegradation review is to ensure that a new or increased pollutant loading will not
degrade water quality. Permitting actions for new or expanding discharges require an antidegradation
review in accordance with 15A NCAC 213.0201. Each applicant for a new/expanding NPDES permit
must document an effort to consider non -discharge alternatives per 15A NCAC 2H.0105(c)(2). In all
cases, existing instream water uses and the level of water quality necessary to protect the existing use is
maintained and protected.
If applicable, describe the results of the antidegradation review, including the Engineering Alternatives
Analysis (EAA) and any water quality modeling results: NA
5. Antibacksliding Review:
Sections 402(o)(2) and 303(d)(4) of the CWA and federal regulations at 40 CFR 122.44(1) prohibit
backsliding of effluent limitations in NPDES permits. These provisions require effluent limitations in a
reissued permit to be as stringent as those in the previous permit, with some exceptions where limitations
may be relaxed (e.g., based on new information, increases in production may warrant less stringent TBEL
limits, or WQBELs may be less stringent based on updated RPA or dilution).
Are any effluent limitations less stringent than previous permit (YESINO): NO
If YES, confirm that antibacksliding provisions are not violated: NA
6.Summary of Proposed Permitting Actions:
A proposed new outfall 008B (emergency spillway) was added to the permit.
7. Public Notice Schedule:
Permit to Public Notice: 06/08/2020
Per 15A NCAC 2H .0109 & .0111, The Division will receive comments for a period of 30 days following
the publication date of the public notice. Any request for a public hearing shall be submitted to the
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Director within the 30 days comment period indicating the interest of the party filing such request and the
reasons why a hearing is warranted.
8. Fact Sheet Addendum (if applicable):
Were there any changes made since the Draft Permit was public noticed (Yes/No):
If Yes, list changes and their basis below:
9. Fact Sheet Attachments (if applicable): NA
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