NC0003468_Modification_20160419

DUKE Duke Energy
Dan River Combined Cycle Station
ENERGY 864 South Edgewood Road
Eden.NC 27288
[phone](office)
8 April 2016
RE E!V ED/NOGEQ/DVVR
Mr. Jeffrey Poupart
North Carolina Division of Water Resources .4 FR .1 9 2 O b
1617 Mail Service Center
Raleigh, NC 27699-1617
Permitting Sec icn
Subject: NPDES Wastewater Permit Modification
Dan River Combined Cycle Station - #NC0003468
Dear Mr. Poupart,
Duke Energy requests that the subject permit be modified to address the additional areas of
wetness (since the last modification request of 29 July 2014) provided below. Please find
attached a location map and analytical data.
AOW ID Coordinates Description
Latitude Longitude
Standing water located between the dredge pond dike
S 05 36.491593 79.716099 and the railroad; a result of plugging inlet to 36-inch pipe.
Does not flow to waters of the U.S.;the water is pumped
to the Secondary Ash Pond.
Wet area (muddy) at toe immediately downstream of
S-06 36.490689 79.712688 slope irregularities. No discernible flow and no discrete
conveyance to river; a berm is in between the AOW and
the river.
Wet area (muddy) at toe immediately downstream of
S-07 36.490721 79.712621 slope irregularities. No discernible flow and no discrete
conveyance to river; a berm is in between the AOW and
the river.
Should you have any questions regarding this submittal or require additional information, please
contact Ross Hartfield at 980-373-6583 or at [e-mail].
Si erely,
'/i'l'ls l-fl�
Lawrence s
General Man ger II
cc: Sergei Chernikov (NCDEQ), Ross Hartfield, Jeremy Pruett, Richard Baker, Jim Wells,
Joyce Dishmon, Will Harrison

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x

Table A-1 Dan River Steam Station Seep/AOW Monitoring Analytical Results—April 22, 2015
Parameter Units S-5
COD mg/L <20
CI -Chloride mg/L 12
Fl -Fluoride mg/L 0.24
Sulfate mg/L 51
Oil&Grease mg/L <5
Hg -Mercury pg/L <0.05
Al -Aluminum mg/L 0.093
Ba -Barium mg/L 0.221
B-Boron mg/L 0.356
Ca-Calcium mg/L 50.1
Hardness (C CO3) 169
Fe-Iron mg/L 0.475
Mg -Magnesium mg/L 10.6
Mn -Manganese mg/L 0.624
Zn -Zinc mg/L <0.005
Sb -Antimony pg/L <1
As -Arsenic pg/L 272
Cd -Cadmium pg/L <1
Cr-Chromium pg/L <1
Cu -Copper pg/L <1
Pb-Lead pg/L <1
Molybdenum (Mo) pg/L 16.3
Ni -Nickel pg/L <1
Se-Selenium pg/L <1
TI—Thallium (low Ng/L <0.2
level)
V-Vanadium pg/L 1.87
TDS-Total Diss. mg/L 250
Solids
TSS -Total mg/L 28
Suspended Solids
A-1

Table A-2 Dan River Steam Station Seep/AOW Monitoring Analytical Results—May 27, 2015
Parameters' Units S-1
Sb -Antimony [Total] pg/L <1
As- Arsenic [Total] pg/L 1.68
Be- Beryllium [Total] pg/L <1
Cd -Cadmium [Total] pg/L <1
Cr-Chromium [Total] pg/L 3.86
Co-Cobalt[Total] pg/L 4.88
Cu—Copper[Total] pg/L 5.62
Pb -Lead [Total] pg/L 3.97
Mo-Molybdenum [Total] pg/L 1.25
Ni -Nickel [Total] pg/L 3.30
Se-Selenium [Total] pg/L <1
TI—Thallium(low level)
pg/L <0.2
[Total]
V-Vanadium (low level)
pg/L 8.06
[Total]
TDS -Total Diss. Solids mg/L 99
TOC -Total Organ. Carbon mg/L 2.1
TSS-Total Suspended mg/L 180
Solids
Chloride mg/L 10
Sulfate mg/L 9.4
Al -Aluminum [Filtered] mg/L <0.005
Ba -Barium [Filtered] mg/L 0.020
B- Boron [Filtered] mg/L <0.05
Fe-Iron [Filtered] mg/L 0.018
Mg -Magnesium [Filtered] mg/L 0.107
Sr-Strontium [Filtered] mg/L 0.157
Zn -Zinc [Filtered] mg/L 0.011
Ca -Calcium [Undigested] mg/L 14.4
Mg-Magnesium mg/L 4.50
[Undigested]
K-Potassium [Undigested] mg/L 1.59
Na-Sodium [Undigested] mg/L 9.07
Al -Aluminum [Total] mg/L 3.41
Ba Barium [Total] mg/L 0.054
B -Boron [Total] mg/L <0.05_
Fe-Iron [Total] mg/L 5.72
Mn -Manganese[Total] mg/L 0.829
Sr-Strontium [Total] mg/L 0.166
Zn -Zinc [Total] mg/L 0.017
Sb-Antimony [Dissolved
pg/L <1
Total Recoverable]
As-Arsenic [Dissolved Total
pg/L <1
Recoverable]
Be-Beryllium [Dissolved
pg/L <1
Total Recoverable]
Cd -Cadmium [Dissolved
pg/L <1
Total Recoverable]
Cr-Chromium [Dissolved
pg/L <1
Total Recoverable]
A-2

Parameters' Units S-1
Co-Cobalt[Dissolved Total pg/L <1
Recoverable]
Cu -Copper[Dissolved Total pg/L 6.15
Recoverable]
Pb -Lead [Dissolved Total pg/L <1
Recoverable]
Mo-Molybdenum [Dissolved pg/L 1.57
Total Recoverable]
Ni - Nickel [Dissolved Total pg/L <1
Recoverable]
Se-Selenium [Dissolved pg/L <1
Total Recoverable]
TI—Thallium (low level)
[Dissolved Total pg/L <0.2
Recoverable]
V-Vanadium(low level)
[Dissolved Total pg/L <0.3
Recoverable]
Nitrite+ Nitrate mg N/L 0.117
(Colorimetric)
Sulfide mg/L <0.2
Alkalinity mg/L 51
Bicarbonate Alkalinity mg/L 51
Carbonate Alkalinity mg/L <10
Methane pg/L <10
Mercury(CVAFS) ng/L <0.5
Notes:
1 Samples were analyzed by Duke Energy except for Sulfide(Element 1),Alkalinity(Shealy), Bicarbonate Alkalinity
(Shealy), Carbonate Alkalinity(Shealy), Methane(Shealy), and Mercury(Shealy)
A-3

Table A-3 Dan River Steam Station Seep/AOW Monitoring Analytical Results—June 26, 2015
Parameters' Units S-1
Cr-Chromium(VI) pg/L 0.022
Se-Selenium(IV) pg/L 0.082
Se-Selenium(VI) pg/L 0.091
As - Arsenic(III) pg/L 0.402
As- Arsenic (V) pg/L 0.195
Fe- Iron (II) pg/L 5.0
Fe- Iron (III) pg/L 29.9
Mn-Manganese(II) pg/L 229
Mn-Manganese(IV) pg/L 0.64
Notes:
1 Samples were analyzed by Brooks Rand
A-4

Table A-4 Dan River Steam Station Seep/AOW Monitoring Analytical Results-November 13,2015
Parameters' Units 8-1 8-2 S-3 Sd S-I5
Alkalinity mg/L 81.8 73.4 62.3 30.9 48.3
Bicarbonate Alkalinity mg/L 81.8 73.4 62.3 30.9 48.3
Carbonate Alkalinity mg/L <5 <5 <5 <5 <5
NO2NO3-Nitrite Nitrate mg-N/L <0.02 0.038 0.077 0.23 467
CI-Chloride mg/L 10 0.7 9.9 1.1 6.1
Fl-Fluoride mg/L 0.24 0.22 0.21 0.14 <0.1
SO4-Sulfate mg/L 24.5 19.9 23.1 22.9 27.6
Al-Aluminum pg/L 8460 293 2620 1450 132
Ba-Barium pg/L 121 48.9 77.5 93.1 45.9
B-Boron pg/L 288 256 272 <50 182
Ca-Calcium pg/L 24100 20400 19700 14100 16000
Fe-Iron mg/L <50 <50 <50 <50 <50
Mg-Magnesium pg/L 8390 6550 5310 4540 6510
Mn-Manganese pg/L <5 <5 <5 <5 <5
K-Potassium pg/L <5000 <5000 5350 <5000 <5000
Na-Sodium pg/L 16500 15200 14700 <5000 8280
Zn-Zinc pg/L 40.6 <10 <10 32.9 <10
Sb-Antimony pg/L <0.5 <0.5 <0.5 <0.5 <0.5
As-Arsenic pg/L 8.3 3.9 4 0.58 0.68
Cd-Cadmium pg/L <0.08 <0.08 <0.08 <0.08 <0.08
Cr-Chromium pg/L 2.7 0.57 3.4 1.2 <0.5
Cu-Copper pg/L 3.7 <1 2.8 4 <1
Pb-Lead pg/L 3.7 0.33 2.2 4 0.2
Molybdenum(Mo) pg/L 14.3 13.2 14.7 0.96 <0.5
Ni-Nickel pg/L 2.8 0.88 2.5 1.6 1.5
Se-Selenium pg/L <0.5 <0.5 <0.5 1.6 <0.5
TI-Thallium pg/L <0.1 <0.1 <0.1 <0.1 <0.1
TDS-Total Diss.Solids mg/L 156 145 136 87 115
TSS-Total Suspended Solids mg/L 248 <2.5 153 178 21.2
3
Hg-Mercury ng/L 10 1.58 2.81 36.5 1.95
pH SI Units 6.69 6.25 6.52 7.02 6.74
Specific Conductance pS/cm 292 264 259 183 212
Temperature °C 15.7 14.2 15.1 17.6 14.7
3
Turbidity NTU 27.9 17.1 50.2 12.5 37.6
Flow cfs 0.0009 0.0032 0.0029 0.0004 0.0002
Notes:
'Flow,pH,Specific conductance,temperature and turbidity were analyzed by Duke Energy;all other parameters were analyzed by Pace
A-5

Table A-5 Dan River Steam Station Seep/AOW Monitoring Analytical Results—December 21, 2015
Parameters Units S-1 S-2 S-3 S-5
Hg -Mercury pg/L 0.728 3.95 5.88 2.71
Nitrite+Nitrate mg-N/L - - - <0.01
Notes:
' Mercury samples were analyzed by Shealy and the Nitrite+Nitrate was analyzed by Duke Energy
A-6