NC0003468_Seep Pollutant Analysis_20170607

k DUKE
ENERGY.
May 26, 2017
RECE1\17)IN rIDEWWR
Mr. Jeffrey O. Poupart JUN 0 7 2017
NC DEQ - DWR
1617 Mail Service Center 1Natel "Duality
Raleigh, NC 27699-1617 Permitting Section
Subject: Seep Pollutant Analysis
Dan River Steam Station — NPDES Permit #NC0003468
Rockingham County
Dear Mr. Poupart:
Dan River Combined Cycle
Duke Energy Carolinas
900 South Edgewood Road
Eden, NC 27288
Pursuant to Part I, Condition A.(23) of the above -referenced permit, Duke Energy Carolinas LLC (Duke Energy) is
required to demonstrate that the water quality standards for constituents listed in permit condition A.(19) are not
contravened in the receiving stream. This demonstration is required to be completed within 180 days of the
effective date of the subject permit using in -stream results at station established in referenced permit. This submittal
fulfills the requirement found in condition A.(23).
Seeps at Dan River Combined Cycle Station are permitted as Outfall 102, Outfall 103, and Outfall 104. Outfall 102
and Outfall 103 discharge to Railroad Branch and Outfall 104 discharges to the Dan River. Outfall 102 is the only
outfall which has had flow since the effective date of the subject permit. Samples collected from Outfall 102
have not exceeded water quality standards for Class C waters found in 15A NCAC 02B .0211, therefore it can be
stated that the flows from the seepage outfalls have not caused contravention of water quality standards.
Duke Energy has also conducted additional sampling in accordance with the requirements of condition A.(19) to
further demonstrate the lack of impact on the receiving water from these flows. This summary of sampling results
within the receiving water bodies is provided as an attachment (Table 1 — Seep Pollutant Analysis). These results
confirm that Outfall 102, Outfall 103, and Outfall 104 have not caused any contravention of water quality standards
for constituents listed in condition A.(19).
If you have any questions, please contact Joyce Dishmon @ aoN ce.dishmon@duke-enercN .corn or 336-623-0238.
"I certify under penalty of law, that this document and all attachments were prepared under my direction
or supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system,
or those persons directly responsible for gathering the information, the information submitted is, to the best
of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties
for submitting false information, including the possibility of fines and imprisonment for knowing
violations. "
Sincerel ,
Lawrence D. Sparks
General Manager II, Regulated Stations
Dan River Combined Cycle
Power Generating Carolinas East
Attachment

Cc: Sergei Chernikov, Ph.D. Environmental Engineer II
1617 Mail Service Center, Raleigh, NC 27699-1617
Dana Newcomb, Lead EHS Professional
Joyce Dishmon, Sr. Env Specialist, CCP P&C
Sherri Knight — Supervisor, DEQ Winston-Salem Regional Office

TABLE 1- SEEP POLLUTANT ANALYSIS
INSTREAM MONITORING RESULTS
DAN RIVER COMBINED CYCLE STATION - NPDES PERMIT: NC0003468
Condition A.(23) compliance demonstration
May -17
Dissolved O a
Dissolved Dissolved Mercury Dissolved Dissolved Dissolved Hardness,
Arsenic, Selenium, USEPA Chromium, Dissolved Cadmium, Copper, Dissolved mg/I
Date Location ug/I ug/I 1631E, ng/I ug/I Lead, ug/I ug/I ug/I Zinc, ug/I (CaCO3)
T D-10 T7 D-5 T D-12 A/C- A/C- A/C- A C-
NCAC 26 Standards Dan River ug/I/NA ug/I/NA ng/I/NA 180/24 14/0.54 0.82/0.15 3.6/2.7 A/C - 36/36 N/A
5/16/2017 Dan River Upstream <1 <1 1.4 <1 <1 <0.1 <1 <5 25.8
5/16/2017 Dan River Downstream <1 <1 1.83 <1 <1 <0.1 <1 <5 25.8
5/16/2017 Railroad Branch Upstream <1 <1 1.44 <1 <1 <0.1 <1 <5 41.5
5/16/2017 Railroad Branch Downstream 1.92 <1 1.45 <1 <1 <0.1 <1 <5 50.9
notes:
mg/I - milligrams per liter (parts per million)
ug/I - micrograms per liter (parts per billion)
ng/I - nanograms per liter (parts per trillion)
A/C - Acute/Chronic
T/D - Total/Dissolved

9
r � ,
..
'e. ,�• rteda .
t �!
n auren Rd Bhdge 'l
L
Plb 705 0
E,KrN : o. G oar rt
1
�y
,Ata
Y