NCS000546_Data Submittal_20141217

DUKE
` ENERGY.
December 17, 2014
Mr. Bradley Bennett
State of North Carolina
Department of Environment and Natural Resources
Division of Energy, Mineral & Land Resources
Stormwater Permitting Program
1612 Mail Service Center
Raleigh, NC 27699-1612
Subject: Allen Steam Station
Stormwater Data Submittal
Dear Mr. Bennett:
Environmental Services
Duke Energy
526 South Church Street
Charlotte, NC 28202
Mailing Address:
Mail Code EC13K/ P.O. Box 1006
Charlotte, NC 28201-1006
Please find attached a summary of analytical data collected from stormwater outfalls at the Allen
Steam Station. Stormwater samples were collected from seven outfalls during three rainfall
events on November 1, November 17 and November 24 of 2014. Outfall locations are indicated
on the site stormwater plan drawing previously submitted.
Please contact me at [e-mail] or at 980-373-7898 if you have any
questions or need any additional information.
Sincerely,
/ v/�
Mark McGary, PE
Environmental Services
RECEIVED
Attachment 1" 1 8 664
DENR•LAND QUALITY
8TORMWATER PERMITTING

Allen Steam Station
Stormwater Monitoring Summary
November 2014
Stormwater samples were collected from seven stormwater outfalls at the Allen Steam Station during rainfall
events on November 1, November 17 and November 24 of 2014 as follows:
Date
Outfalls Sampled
Rainfall Event Duration
Rainfall Amount
November 1, 2014
ISW-001
980 minutest0.77
inches'
November 17, 2014
SW004, SW006, 2SW009,
SW013 and SW016
580 minutes'
0.44 inches'
November 24, 2014
SW002
920 minutest
1.64 inches'
t Rainfall amount was obtained from a nearby USGS site (#351247080592745).
Samples were collected directly into properly preserved bottles and shipped on ice to Duke Energy's
analytical laboratory in Huntersville, NC. Analyses were conducted by Duke Energy's Huntersville
analytical laboratory (NC Wastewater Certification #248) and Pace Analytical Laboratories (NC Wastewater
Certification # 12).
Analytical parameters for analysis were: TSS, TDS, Oil &Grease, Cl, SO4, F, COD, Al, As, B, Ba, Ca, Cd,
Cu, Cr, Fe, Mn, Mo, Mg, Ni, Pb, Sb, Se, Tl, Zn, Hardness and Hg. Laboratory analytical methods used for
each parameter are provided in Appendix A. Specific conductance, and pH were measured in the field using
calibrated instruments. Storage and preservation techniques of the samples after collection, and prior to
analyses, were followed according to Appendix B.
Notes:
Samples collected from SW -001 were stored in a refrigerator over the weekend prior to shipment to the
laboratory for analysis. At the time of shipment it was noted that the samples were frozen. Samples were
thawed and analyzed.
2 Samples for SW009 were collected from a concrete ditch approximately 30 feet up -gradient from the
outfall.
All Analytical results are summarized in Appendix C.

Appendix A
Laboratory Analytical
Methods

Component
Method
RDL*
Units
Lab
COD
HACH 8000
20
mg/L
Duke
Chloride
EPA 300.0
0.1
mg/L
Duke
Fluoride
EPA 300.0
0.1
mg/L
Duke
Sulfate
EPA 300.0
0.1
mg/L
Duke
Oil and Grease
EPA 16648
5
mg/L
Pace
Mercury (Hg)
EPA 245.1
0.05
ug/L
Duke
Aluminum (Al)
EPA 200.7
0.005
mg/L
Duke
Barium (Ba)
EPA 200.7
0.005
mg/L
Duke
Boron (B)
EPA 200.7
0.05
mg/L
Duke
Calcium (Ca)
EPA 200.7
0.01
mg/L
Duke
Hardness
EPA 200.7
0.19
mg/L(CaCO3)
Duke
Iron (Fe)
EPA 200.7
0.01
mg/L
Duke
Magnesium (Mg)
EPA 200.7
0.005
mg/L
Duke
Manganese (Mn)
EPA 200.7
0.005
mg/L
Duke
Zinc (Zn)
EPA 200.7
0.005
mg/L
Duke
Antimony (Sb)
EPA 200.8
1
ug/L
Duke
Arsenic (As)
EPA 200.8
1
ug/L
Duke
Cadmium (Cd)
EPA 200.8
1
ug/L
Duke
Chromium (Cr)
EPA 200.8
1
ug/L
Duke
Copper (Cu)
EPA 200.8
1
ug/L
Duke
Lead (Pb)
EPA 200.8
1
ug/L
Duke
Molybdenum (Mo)
EPA 200.8
1
ug/L
Duke
Nickel (Ni)
EPA 200.8
1
ug/L
Duke
Selenium (Se)
EPA 200.8
1
ug/L
Duke
Thallium (TI) Low Level
EPA 200.8
0.2
ug/L
Duke
TDS
SM2540C
500
mg/L
Duke
TSS
SM2540D
25
mg/L
Duke
*: Reporting limits are nominal; values are higher if sample dilution was required.

Appendix B
Sample Preservation and Hold Times

Parameter name
Container'
Preservations
Maximum holding
time
Table IB—Inorganic Tests:
1. Acidity
P, FP, G
Cool, <_6 °C1e
14 days.
2. Alkalinity
P, FP, G
Cool, s6 °C'
14 days.
4. Ammonia
P. FP, G
Cool, s6 °C1B, HaSO, to pH <2
28 days.
9. Biochemical oxygen demand
P, FP, G
Cool, 56 °C13
48 hours.
10. Boron
P, FP, or Quartz
HNO, to pH <2
6 months.
11. Bromide
P, FP, G
None required
28 days.
14. Biochemical oxygen demand, carbonaceous
P, FP G
Cool, 56'C`
48 hours.
15. Chemical oxygen demand
P, FP, G
Cool, s6 00, HISO4 to pH <2
28 days.
16. Chloride
P, FP, G
None required
28 days.
17. Chlorine, total residual
P, G
None required
Analyze within 15
minutes.
21. Color
P, FP, G
Cool, 56 °C1e
48 hours.
23-24. Cyanide, total or available (or CATC) and free
P, FP, G
Cool, 56 00, NaOH to pH >10'
14 days.
8, reducing agent B oxidizer
present
25. Fluoride
P
None required
28 days.
27. Hardness
P, FP, G
HNO3 or H2SO4 to pH <2
6 months.
28. Hydrogen ion (pH)
P, FP, G
None required
Analyze within 15
minutes.
31, 43. Kjeldahl and organic N
P, FP, G
Cool, s6 00, H2SO4 to pH <2
28 days.
Table IB—Metals:'
18. Chromium VI
P, FP, G
Cool, s6 00, pH = 9.3-9.720
28 days.
35. Mercury (CVAA)
P, FP, G
HNO3 to pH <2
28 days.
35. Mercury (CVAFS)
FP, G; and FP-
5 mUL 12N HCI or 5 mUL BrCI"
90 days."
lined cap"
3, 5.8, 12, 13, 19, 20, 22, 26, 29, 30, 32-34, 36, 37, 45,
P, FP, G
HNO3 to pH <2, or at least 24
6 months.
47, 51, 52, 58-60, 62, 63, 70-72, 74, 75. Metals, except
hours prior to analysis"
boron, chromium VI, and mercury
38. Nitrate
P, FP, G
Cool, s6 00
48 hours.
39. Nitrate -nitrite
P, FP, G
Cool, 56 0C10, H2SO4 to pH <2
28 days.
40. Nitrite
P, FP, G
Cool, s6 °C13
48 hours.
41. Oil and grease
G
Cool to s6 °Ct3, HCI or H2SO, to
28 days.
pH <2
42. Organic Carbon
P, FP, G
Cool to s6 °C13, HCI, H2SO4, or
28 days.
H3PO4 to pH <2
44. Orthophosphate
P, FP, G
Cool, to <-6 *024
Filter within 15 minutes;
Analyze within 48
hours.
46. Oxygen, Dissolved Probe
G. Bottle and top
None required
Analyze within 15
minutes.
47. Winkler
G, Bottle and top
Fix on site and store in dark
8 hours.
48. Phenols
G
Cool, s6 °C'a. HzSO4 to pH <2
28 days.
49. Phosphorous (elemental)
G
Cool, 56 °Ct0
48 hours.
50. Phosphorous, total
P. FP, G
Cool, s6 00, H2SO, to pH <2
28 days.
53. Residue, total
P, FP, G
Cool, 56 °C13
7 days.
54. Residue, Filterable
P, FP, G
Cool, 56 00
7 days.
55. Residue, Nonfilterable (TSS)
P, FP, G
Cool, 56 °C'"
7 days.
56. Residue, Settleable
P, FP, G
Cool, s6 00
48 hours.
57. Residue, Volatile
P, FP, G
Cool, 56 00
7 days.
61. Silica
P or Quartz
Cool, s6 °C18
28 days.
64. Specific conductance
P, FP, G
Cool, 56 °C13
28 days.
65. Sulfate
P. FP, G
Cool, 56 °C13
28 days.
66. Sulfide
P, FP, G
Cool, s6 °C13, add zinc acetate
7 days.
plus sodium hydroxide to pH >9
67. Sulfite
P. FP, G
None required
Analyze within 15
minutes.
68. Surfactants
P, FP, G
Cool, <_6 °C18
48 hours.
69. Temperature
P, FP, G
None required
Analyze.
73. Turbidity
P, FP, G
Cool, <_6 °C"
1 48 hours.
'"P" is for polyethylene; "FP" is fluoropolymer (polytetrafluoroethylene (PTFE); Teflon©), or other fluoropolymer, unless stated otherwise
in this Table 11; "G' is glass; "PA" is any plastic that is made of a sterilizable material (polypropylene or other autoclavable plastic); "LDPE" is
low density polyethylene.
2Except where noted in this Table II and the method for the parameter, preserve each grab sample within 15 minutes of collection. For a
composite sample collected with an automated sample (e.g., using a 24-hour composite sample; see 40 CFR 122.21(g)(7)(i) or 40 CFR Part
403, Appendix E), refrigerate the sample at 56 °C during collection unless specified otherwise in this Table 11 or in the method(s). For a
composite sample to be split into separate aliquots for preservation andror analysis, maintain the sample at 56 °C, unless specified otherwise
in this Table It or in the method(s), until collection, splitting, and preservation is completed. Add the preservative to the sample container prior
to sample collection when the preservative will not compromise the integrity of a grab sample, a composite sample, or aliquot split from a

composite sample within 15 minutes of collection. If a composite measurement is required but a composite sample would compromise sample
integrity, individual grab samples must be collected at prescribed time intervals (e.g., 4 samples over the course of a day, at 6 -hour intervals).
Grab samples must be analyzed separately and the concentrations averaged. Alternatively, grab samples may be collected in the field and
composited in the laboratory if the compositing procedure produces results equivalent to results produced by arithmetic averaging of results of
analysis of individual grab samples. For examples of laboratory composifing procedures, see EPA Method 1664 Rev. A (oil and grease) and
the procedures at 40 CFR 141.34(1)(14)(iv) and (v) (volatile organics).
'When any sample is to be shipped by common carrier or sent via the U.S. Postal Service, it must comply with the Department of
Transportation Hazardous Materials Regulations (49 CFR part 172). The person offering such material for transportation is responsible for
ensuring such compliance. For the preservation requirement of Table II, the Office of Hazardous Materials, Materials Transportation Bureau,
Department of Transportation has determined that the Hazardous Materials Regulations do not apply to the following materials: Hydrochloric
acid (HCI) in water solutions at concentrations of 0.04% by weight or less (pH about 1.96 or greater, Nitric acid (HNO3) in water solutions at
concentrations of 0.15% by weight or less (pH about 1.62 or greater); Sulfuric acid (H2SO4) in water solutions at concentrations of 0.35% by
weight or less (pH about 1.15 or greater); and Sodium hydroxide (NaOH) in water solutions at concentrations of 0.080% by weight or less (pH
about 12.30 or less).
4Samples should be analyzed as soon as possible after collection. The times listed are the maximum times that samples may be held
before the start of analysis and still be considered valid. Samples may be held for longer periods only if the permittee or monitoring laboratory
has data on file to show that, for the specific types of samples under study, the analytes are stable for the longer time, and has received a
variance from the Regional Administrator under Sec. 136.3(e). For a grab sample, the holding time begins at the time of collection. For a
composite sample collected with an automated sampler (e.g., using a 24-hour composite sampler; see 40 CFR 122.21(g)(7)(i) or 40 CFR part
403, Appendix E), the holding time begins at the time of the end of collection of the composite sample. For a set of grab samples composited
in the field or laboratory, the holding time begins at the time of collection of the fast grab sample in the set. Some samples may not be stable
for the maximum time period given in the table. A permittee or monitoring laboratory is obligated to hold the sample for a shorter time if it
knows that a shorter time is necessary to maintain sample stability. See 136.3(e) for details. The date and time of collection of an individual
grab sample is the date and time at which the sample is collected. For a set of grab samples to be composited, and that are all collected on
the same calendar date, the date of collection is the date on which the samples are collected. For a set of grab samples to be composited, and
that are collected across two calendar dates, the date of collection is the dates of the two days; e.g., November 14-15. For a composite
sample collected automatically on a given date, the date of collection is the date on which the sample is collected. For a composite sample
collected automatically, and that is collected across two calendar dates, the date of collection is the dates of the two days; e.g., November 14-
15. For static -renewal toxicity tests, each grab or composite sample may also be used to prepare test solutions for renewal at 24 h, 48 h,
and/or 72 h after first use, if stored at 0-6 °C, with minimum head space.
5ASTM D7365 -09a specifies treatment options for samples containing oxidants (e.g., chlorine). Also, Section 9060A of Standard
Methods for the Examination of Water and Wastewater (20th and 21st editions) addresses dechlorination procedures.
6Sampling, preservation and mitigating interferences in water samples for analysis of cyanide are described in ASTM D7365 -09a. There
may be interferences that are not mitigated by the analytical test methods or D7365 -09a. Any technique for removal or suppression of
interference may be employed, provided the laboratory demonstrates that it more accurately measures cyanide through quality control
measures described in the analytical test method. Any removal or suppression technique not described in D7365 -09a or the analytical test
method must be documented along with supporting data.
'For dissolved metals, filter grab samples within 15 minutes of collection and before adding preservatives. For a composite sample
collected with an automated sampler (e.g., using a 24-hour composite sampler, see 40 CFR 122.21(g)(7)(i) or 40 CFR Part 403, Appendix E),
filter the sample within 15 minutes after completion of collection and before adding preservatives. If it is known or suspected that dissolved
sample integrity will be compromised during collection of a composite sample collected automatically over time (e.g., by interchange of a metal
between dissolved and suspended forms), collect and filter grab samples to be composited (footnote 2) in place of a composite sample
collected automatically.
8Guidance applies to samples to be analyzed by GC, LC, or GC/MS for specific compounds.
Off the sample is not adjusted to pH 2, then the sample must be analyzed within seven days of sampling.
'OThe pH adjustment is not required if acrolein will not be measured. Samples for acrolein receiving no pH adjustment must be analyzed
within 3 days of sampling.
"When the extractable analytes of concern fail within a single chemical category, the specified preservative and maximum holding
times should be observed for optimum safeguard of sample integrity (i.e., use all necessary preservatives and hold for the shortest time listed).
When the analytes of concern tall within two or more chemical categories, the sample may be preserved by cooling to 56 °C, reducing residual
chlorine with 0.0080% sodium thiosulfate, storing in the dark, and adjusting the pH to 6-9; samples preserved in this manner may be held for
seven days before extraction and for forty days after extraction. Exceptions to this optional preservation and holding time procedure are noted
in footnote 5 (regarding the requirement for thiosuffate reduction), and footnotes 12, 13 (regarding the analysis of benzidine).
"If 1,2-diphenylhydrazine is likely to be present, adjust the pH of the sample to 4.0 i0.2 to prevent rearrangement to benzidine.
"Extracts may be stored up to 30 days at <0 °C.
14 For the analysis of diphenylnitrosamine, add 0.008% Na2S20s and adjust pH to 7-10 with NaOH within 24 hours of sampling.
15The pH adjustment may be performed upon receipt at the laboratory and may be omitted it the samples are extracted within 72 hours
of collection. For the analysis of aldrin, add 0.0080% Na2S203.
'6Place sufficient ice with the samples in the shipping container to ensure that ice is still present when the samples arrive at the
laboratory. However, even if ice is present when the samples arrive, immediately measure the temperature of the samples and confirm that
the preservation temperature maximum has not been exceeded. In the isolated cases where it can be documented that this holding
temperature cannot be met, the permittee can be given the option of on-site testing or can request a variance. The request for a variance
should include supportive data which show that the toxicity of the effluent samples is not reduced because of the increased holding
temperature. Aqueous samples must not be frozen. Hand -delivered samples used on the day of collection do not need to be cooled to 0 to 6
OC prior to test initiation.
"Samples collected for the determination of trace level mercury (<100 ng/L) using EPA Method 1631 must be collected in tightly -
capped fluoropolymer or glass bottles and preserved with BrCI or HCI solution within 48 hours of sample collection. The time to preservation
may be extended to 28 days if a sample is oxidized in the sample bottle. A sample collected for dissolved trace level mercury should be
filtered in the laboratory within 24 hours of the time of collection. However, if circumstances preclude overnight shipment, the sample should
be filtered in a designated clean area in the field in accordance with procedures given in Method 1669. If sample integrity will not be
maintained by shipment to and filtration in the laboratory, the sample must be filtered in a designated clean area in the field within the time

period necessary to maintain sample integrity. A sample that has been collected for determination of total or dissolved trace
level mercury must be analyzed within 90 days of sample collection.
'oAqueous samples must be preserved at 56 °C, and should not be frozen unless data demonstrating that sample freezing
does not adversely impact sample integrity is maintained on file and accepted as valid by the regulatory authority. Also, for
purposes of NPDES monitoring, the specification of "<_°C" is used in place of the "4 °C' and "<4 °C' sample temperature
requirements listed in some methods. It is
not necessary to measure the sample temperature to three significant figures (1/100th of 1 degree); rather, three significant
figures are
specified so that rounding down to 6 °C may not be used to meet the 296 °C requirement. The preservation temperature does
not apply to samples that are analyzed immediately (less than 15 minutes).
"An aqueous sample may be collected and shipped without acid preservation. However, acid must be added at least 24
hours before analysis to dissolve any metals that adsorb to the container walls. If the sample must be analyzed within 24 hours of
collection, add the acid immediately (see footnote 2). Soil and sediment samples do not need to be preserved with acid. The
allowances in this footnote supersede the
preservation and holding time requirements in the approved metals methods.
2OTo achieve the 28 -day holding time, use the ammonium sulfate buffer solution specified in EPA Method 218.6. The
allowance in this footnote supersedes preservation and holding time requirements in the approved hexavalent chromium
methods, unless this supersession
would compromise the measurement, in which case requirements in the method must be followed.
21Holding time is calculated from time of sample collection to elution for samples shipped to the laboratory in bulk and
calculated from the time of sample filtration to elution for samples filtered in the field.
nSample analysis should begin as soon as possible after receipt; sample incubation must be started no later than 8 hours
from time of
collection.
23For fecal coliform samples for sewage sludge (biosolids) only, the holding time is extended to 24 hours for the following
sample types using either EPA Method 1680 (LTB -EC) or 1681 (A-1): Class A composted, Class B aerobically digested, and
Class 8 anaerobically digested.
2°The immediate filtration requirement in orthophosphate measurement is to assess the dissolved or bio -available forth of
orthophosphorus (i.e., that which passes through a 0.45 -micron filter), hence the requirement to filter the sample immediately
upon collection
(i.e., within 15 minutes of collection).
[38 FR 28758, Oct. 16, 1973

Appendix C
Analytical Data Summary

Parameter
UnitsSample
SW001
SW002
SW004
Locations
SW006
SW009
SW013
SW016
COD
mg/L
150
<
20
<
20
<
20
<
20
<
20
<
20
CI- Chloride
mg/L
2.3
9.3
1.6
1.4
1.9
3.6
4.1
Fluoride
mg/L
1.5
0.12
0.1
0.12
0.24
0.11
0.22
SOq- Sulfate
mg/L
9.8
110
100
110
62
74
60
Oil & Grease
mg/L
<
5
<
5
<
5
<
5
<
5
<
5
<
5
Hg - Mercury
pg/L
<
0.05
<
0.05
<
0.05
<
0.05
<
0.05
<
0.05
<
0.05
AI- Aluminum
mg/L
4.71
0.02
0.788
0.064
1
0.092
0.034
2.38
Ba - Barium
mg/L
0.031
1
0.016
0.03
0.018
0.027
0.046
0.072
B - Boron
mg/L
0.072
0.083
0.227
<
0.05
<
0.05
<
0.05
0.269
Ca-Calcium
mg/L
14.4
90.9
52.4
53.3
42.1
57.2
32.9
Hardness
mg/L(CaCO3)
47.5
277
143
150
119
164
101
Fe -Iron
mg/L
6.99
0.09
1.12
0.074
0.136
0.053
2.48
Mg-Magnesium
mg/L
2.81
12.1
2.87
4.12
3.45
5.22
4.51
Mn- Manganese
mg/L
0.205
0.067
0.028
0.006
<
0.005
0.005
0.039
Zn -Zinc
mg/L
2.8
0.032
0.012
0.013
1
0.188
0.073
0.048
Sb - Antimony
pg/L
<
1
<
1
<
1
<
1
<
1
<
1
1.25
As- Arsenic
pg/L
1.25
1 <
1
1.18
<
1
1.37
2.01
15.1
Cd- Cadmium
pg/L
<
1
<
1
<
1
<
1
<
1
<
1
<
1
Cr - Chromium
IWL
3.84
<
1
<
1
<
1
<
1
<
1
6.79
Cu - Copper
pg/L
11.9
<
1
2.63
<
1
1.92
2.83
6.01
Pb -Lead
pg/L
5.44
<
1
<
1
<
1
<
1
<
1
1.68
Mo - Molybdenum
pg/L
<
1
3.58
2.08
2.55
11.3
186
19.8
Ni - Nickel
µg/L
2.52
<
1
<
1
<
1
<
1
<
1
<
1
Se - Selenium
Vg/l.
<
1
1.09
5.39
1.83
19.9
5.26
7.01
TI- Thallium
pg/L
0.202
1 <
0.2
<
0.2
<
0.2
<
0.2
<
0.2
<
0.2
PH
SI Units
7.4
7.36
7.09
7.83
7.57
6.87
Specific conductance
tis/cm
508
239
254
216
301
192
TDS- Total Diss. Solids
mg/L
540
370
1
220
210
170
230
190
Temperature
'C
17.7
13.5
14.1
15.7
15.4
13
TSS-Total Suspended Solids
mg/L
130
<
5
14
<
5
<
5
<
5
1
41
1 Samples were placed in a refrigerator for storage prior to shipment to the Duke Energy Analytical Laboratory. By the time that samples were retrieved from the refrigerator for
shipment, they were frozen. North Carolina Division of Water Resources laboratory certification personnel were contacted. The guidance given was to analyze the samples and
flag the data. Additionally, SW -001 was measured for pH, but the value is not reported in the table above. The value (20 s.u.) was determined to be an erroneous reading from
a malfunctioning instrument.
z Sample for SW009 was collected from a concrete ditch approximately 30 feet up -gradient from the outfall