HomeMy WebLinkAboutNCS000548_Marshall Data Submittal (2)_20151022t� DUKE
ENERGY-,
October 22, 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, INC 27699-1612
Subject: Marshall 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
RECEIVED
OCT 2 2014
DENR-LAND QUALITY
STORW ATER PERMITTING
Please find attached a summary of limited analytical data collected from stormwater outfalls at
the Marshall Steam Station.
The accompanying analytical data was collected on September 29, 2014, and is representative
of stormwater conveyed by Outfalls SWO07 and SWO12. Outfall locations are indicated on the
site stormwater plan drawing previously submitted. Actual sampling locations are described in
the attached summary.
Please contact me at Mark.McGary@duke-energy.com or at 980-373-7898 if you have any
questions or need any additional information.
Sincerely,
A
/�
Mark McGary, PE
Environmental Services
Attachment
Marshall Steam Station
Stormwater Monitoring Summary
September 2014
Stormwater samples were collected from two stormwater outfalls at Marshall Steam Station during a storm
event on September 29, 2014. The rainfall event was approximately 240 minutes in duration and measured
approximately 0. 19 inches of precipitation. The previous rain event was greater than 72 hours prior.
Samples collected are representative of stormwater conveyed by Outfalls SW007 and SW012. The actual
outfalls at these locations are inaccessible. Samples were collected from the first accessible up -gradient
catch basins associated with each outfall. Sampling locations and estimated flow rates are summarized in the
following table:
Sample Date
Inferred Outfall
Outfall Accessibility and Actual Sampling Location
Sampled
September 29, 2014
SW007
Outfall is submerged; sample was collected from the first
accessible up -gradient manhole.
September 29, 2014
SW012
Outfall is elevated and was accessible only by boat;
sam le was collected from the pipe inlet.
Samples were collected directly into properly preserved bottles and shipped on ice to Duke Energy's
analytical laboratory in Huntersville, NC. Laboratory 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. Specific conductance, and pH were
measured in the field using calibrated instruments. Laboratory analytical methods used for each parameter
are provided in Appendix A.
Storage and preservation techniques of the samples after collection, and prior to analyses, were followed
according to Appendix B.
Analytical results are summarized in Appendix C.
Appendix A
Laboratory Analytical Methods
Parameter
Method
Reporting
Limit*
Units
Lab
COD
HACH 8000
20
mg/L
Duke Energy
Chloride
EPA 300.0
0.1
mg/L
Duke Energy
Fluoride
EPA 300.0
0.1
mg/L
Duke Energy
Sulfate
EPA 300.0
1
mg/L
Duke Energy
Oil and Grease
EPA 16648
5
mg/L
Pace Analytical
Mercury (Hg)
EPA 245.1
0.05
µg/L
Duke Energy
Aluminum (Al)
EPA 200.7
0.005
mg/L
Duke Energy
Barium (Ba)
EPA 200.7
0.005
mg/L
Duke Energy
Boron(B)
EPA 200.7
0.05
mg/L
Duke Energy
Calcium (Ca)
EPA 200.7
0.1
mg/L
Duke Energy
Hardness
EPA 200.7
0.19
mg/L (CaCO3)
Duke Energy
Iron (Fe)
EPA 200.7
0.01
mg/L
Duke Energy
Magnesium (Mg)
EPA 200.7
0.005
mg/L
Duke Energy
Manganese (Mn)
EPA 200.7
0.005
mg/L
Duke Energy
Zinc (Zn)
EPA 200.7
0.005
mg/L
Duke Energy
Antimony (Sb)
EPA 200.8
1
µg/L
Duke Energy
Arsenic (As)
EPA 200.8
1
µg/L
Duke Energy
Cadmium (Cd)
EPA 200.8
1
lig/l.
Duke Energy
Chromium (Cr)
EPA 200.8
1
µg/L
Duke Energy
Copper (Cu)
EPA 200.8
1
µg/L
Duke Energy
Lead (Pb)
EPA 200.8
1
µg/L
Duke Energy
Molybdenum (Mo)
EPA 200.8
1
µg/L
Duke Energy
Nickel (Ni)
EPA 200.8
1
µg/L
Duke Energy
Selenium (Se)
EPA 200.8
1
µg/L
Duke Energy
Thallium (TI) Low Level
EPA 200.8
0.2
µg/L
Duke Energy
TDS
SM2540C
25
mg/L
Duke Energy
TSS
SM2540D
5
mg/L
Duke Energy
*: Reporting limits are nominal; values are higher if sample dilution was required.
Appendix B
Sample Preservation
and Hold Times
Parameter name
Container'
Preservation23
Maximum holding
time4
Table IB—Inorganic Tests:
1. Acidity
P, FP, G
Cool, 56 0C1e
14 days.
2. Alkalinity
P. FP, G
Cool, s6 00
14 days.
4. Ammonia
P, FP, G
Cool, 56 0C1e, HzSO, to pH <2
28 days.
9. Biochemical oxygen demand
P, FP, G
Cool, 156 °C1e
48 hours.
10. Boron
P, FP, or Quartz
HNO3 to pH <2
6 months.
11. Bromide
P, FP, G
None required
28 days.
14. Biochemical oxygen demand, carbonaceous
P, FP G
Cool, s6'Cl'
48 hours.
15. Chemical oxygen demand
P, FP, G
Cool, <6 °C1e H2SO4 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'C'8
48 hours.
23-24. Cyanide, total or available (or CATC) and free
P, FP, G
Cool, 56 0018, NaOH to pH >10'
14 days.
6, reducing agent if 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 0C18, H2SO4 to pH <2
28 days.
Table IB—Metals:'
18. Chromium VI
P, FP, G
Cool, s6 °018, 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
HNOa 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 analysis1e
boron, chromium VI, and mercury
38. Nitrate
P, FP, G
Cool, s6 00
48 hours.
39. Nitrate -nitrite
P, FP, G
Cool, 56 °C1e, H2SO4 to pH <2
28 days.
40. Nitrite
P, FP, G
Cool, s6 0C18
48 hours.
41. Oil and grease
G
Cool to 56 0C18, HCI or H2SO4 to
28 days.
PH <2
42. Organic Carbon
P, FP, G
Cool to sl, °C1e HCI, H2SO4, or
28 days.
HaPO4 to pH <2
44. Orthophosphate
P, FP, G
Cool, to 296 C1821
Fitter 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 °018, H2SO4 to pH <2
28 days.
49. Phosphorous (elemental)
G
Cool, s6 °C1a
48 hours.
50. Phosphorous, total
P, FP, G
Cool, sl, 0C18, H2SO4 to pH <2
28 days.
53. Residue, total
P, FP, G
Cool, 56 °C18
7 days.
54. Residue, Filterable
P, FP, G
Cool, :56 °Ct8
7 days.
55. Residue, Nonfilterable (TSS)
P, FP, G
Cool, s6 °C1e
7 days.
56. Residue, Settleable
P, FP, G
Cool, s6 00
48 hours.
57. Residue, Volatile
P, FP, G
Cool, 56 °C1a
7 days.
61. Silica
P or Quartz
Cool, s6 0C18
28 days.
64. Specific conductance
P, FP, G
Cool, !96 °C18
28 days.
65. Sulfate
P, FP, G
Cool, 56 °Ct8
28 days.
66. Sulfide
P, FP, G
Cool, s6 0C1a, 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 °C1e
48 hours.
69. Temperature
P, FP, G
None required
Analyze.
73. Turbidity
P, FP, G
Cool, 56 0018
48 hours.
'"P" is for polyethylene; "FP" is fluoropolymer (polytetmfluoroethylene (PTFE); Teflon®), or other fluoropolymer, unless stated otherwise
in this Table II; "G' is glass; 'PA" is any plastic that is made of a sterilizable material (polypropylene or other autoclavable plastic); "LOPE" 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 0C during collection unless specified otherwise in this Table II or in the method(s). For a
composite sample to be split into separate aliquots for preservation and/or analysis, maintain the sample at s6 °C, unless specified otherwise
in this Table II 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 composlting procedures, see EPA Method 1664 Rev. A (oil and grease) and
the procedures at 40 CFR 141.34(f)(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 ll, 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 0.150/6 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).
'Samples 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 last 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 07365.09a or the analytical test
method must be documented along with supporting data.
7For 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 atter 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.
°If the sample is not adjusted to pH 2, then the sample must be analyzed within seven days of sampling.
"The 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 fall 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 fall within two or more chemical categories, the sample may be preserved by cooling to 256 °C, reducing residual
chlorine with 0.0080/6 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 thiosulfate 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 x0.2 to prevent rearrangement to benzidine.
"Extracts may be stored up to 30 days at <0 °C.
1°For the analysis of diphenylnitrosamine, add 0.008% Na2S2O3 and adjust pH to 7-10 with NaOH within 24 hours of sampling.
'sThe pH adjustment may be performed upon receipt at the laboratory and may be omitted if the samples are extracted within 72 hours
of collection. For the analysis of aldrin, add 0.0080% Na2S2O3
"Place 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
°C prior to test initiation.
1?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, it 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.
13Aqueous samples must be preserved at 156 °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 "s°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 56 °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.
20To 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.
22Sample 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 B anaerobically digested.
24The immediate filtration requirement in orthophosphate measurement is to assess the dissolved or bio -available form 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
Units
Sample Location
SWO07 SWO12
COD
mg/L
26
< 20
CI - Chloride (00940)
mg/L
1.3
6.8
Fluoride
mg/L
0.68
0.45
SO4 - Sulfate (00945)
mg/L
64
220
Oil & Grease
mg/L
< 5
< 5
Hg - Mercury (71900)
M/L
< 1
< 0.05
Al - Aluminum (01105)
mg/L
35
0.941
Ba - Barium (01007)
mg/L
0.469
0.042
B - Boron (01022)
mg/L
0.181
0.064
Ca-Calcium
mg/L
52.6
103
Hardness
mg/L(CaCO3)
187
262
Fe - Iron (01045)
mg/L
54.9
0.896
Mg-Magnesium
mg/L
13.5
1.32
Mn - Manganese (01055)
mg/L
0.748
0.016
Zn - Zinc (01092)
mg/L
0.91
0.075
Sb - Antimony (01097)
lig/L
1.4
1.11
As-Arsenic(01002)
µg/L
32.2
1.06
Cd - Cadmium (01027)
µg/L
1.42
< 1
Cr - Chromium (01034)
pg/L
60.3
1.53
Cu - Copper (01042)
µg/L
96.3
4.79
Pb - Lead (01051)
µg/L
48.5
< 1
Molybdenum (Mo)
µg/L
10.9
2.74
Ni- Nickel (01067)
pg/L
52.8
1.4
Se - Selenium (01147)
pg/L
19.6
6.76
Ti -Thallium (01059)
pg/L
1.08
0.426
pH
SI Units
7.75
7.71
Specific conductance
µ5/cm
224
428
TDS - Total Diss. Solids (70300)
mg/L
290
370
Temperature
°C
TSS-Total Suspended Solids
mg/L
1100
27
Note: temperatures were not taken during the sampling event.