NC0004987_Response to Comments to Draft Permit_19950713

July 13, 1995
MEMQRANDUM
To: Dana Bolden
From: Farrell Keough
Through: Carla Sanderson
Ruth Swanek �c
J
Subject: Duke Power Company - Marshall Steam Plant
NC0004987
Catawba County
Response to Comments to DRAFT NPDES Permit
A wasteload allocation was completed for this facility in June, 1995. A letter from the facility
questioning the various Permit requirements was sent in June, 1995. This memorandum represents the
Instream Assessment Unit response.
"The cover letter to the draft NPDES permit indicated that an Acute Toxicity testing requirement was
added to outfall 001. This was not reflected in the permit and we request that this not be added in
the final permit..."
This is our current standard operating practice for discharges classified as major facilities. We
leave the final decision of requiring this test and selection of the most appropriate test to the
Environmental Science Branch.
• 1 1 111- •1.1• u•1 • 1• OZ -7M711'11 1.• OTT 11
"We request... sampling for Manganese, Cadmium, and Sulfates added to the monitoring
requirements for outfall 001 be omitted, as no by-products of coal combustion are added to this
effluent."
Review of instream monitoring data taken below this outfall indicates elevated levels of
manganese. The attached map indicates that site number 14 was the appropriate downstream
location for this review and the instream data presented by Duke Power for this location, (also
attached) are at levels above the standard for instream levels. As this cannot be specifically
attributed to pipe 001 without effluent data from this pipe, it is recommended that continuation
of this monitoring remain.
The sulfate monitoring data attached indicates levels far below the standard, (250 mg/1).
Although other species of this chemical can exist in the water column, (i.e. S and SOO the
sulfate form is the most common and should be representative of the other species. The IAU
concurs with omitting this monitoring requirement.
Long term cadmium monitoring information does not exist in either the effluent DMR's or in this
instream monitoring information. As metal was found at a very low level, (0.1 µg/1) in the effluent,
it is doubtful that it would exceed the allowable limit for this discharge. We will support either
omitting this monitoring requirement or changing the frequency of this monitoring to quarterly
sampling.

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Figure 2-1. Sampling locations on Lake Norman, North Carolina during maintenance
monitoring program for McGuire Nuclear Station.
2-19

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Page 1
'� Note for Farrell Keough
From: Ken Eagleson
Date: Jun 27, 1995 9:17 AM
Subject: RE: Duke: Marshall 316a report
To: Farrell Keough
Cc: Dave Goodrich
I believe that the report says that there is a balanced and indigenous population that currently
exists within the LAke even if it was addressing temperature. I can understand their use of
this to info to support their position and would do the same if I were them. HOWEVER,
The issue for Manganese and Sulfates is not aquatic life but Water SUpply so this does not
apply. Its a treatment thang. Cadmium is limited by aquatic life and can be wicked if in the
available form. Send me their specifics if you want and I can put a man on it to see if their
objections are reasonable. Ken
From: Farrell Keough on Mon, Jun 26, 1995 3:31 PM
Subject: Duke: Marshall 316a report
To: Ken Eagleson
Cc: Dave Goodrich
Do you have any info. on this which deals with toxics, (i.e. metals, specifically maganese,
cadmium, and sulfates). They are contesting some permit requirements and indicating that
this report substantiates their claims of no effects.
It seemed to me that this report only deals with temperature plumes...

r
Duk._ Pouer Compam
"'earC S,stem Support Department
15 339 ii , e Fen.P Road
Hatters: dt, A'12:'078-7929
DUKEPCiK'ER
June 22,1995
Mr. David Goodrich
NCDEHNR/WQ Section
P.O.Box 29535
Raleigh, North Carolina 27626-0535
Subject: Marshall Steam Station
NPDES Permit No. NC0004987
Catawba County
Comments on Draft Permit
File: MS -706.15
Dear Mr. Goodrich:
We have reviewed the draft NPDES permit No. NC0004987 and submit for your
consideration the attached list of comments, as well as a marked up copy of the draft
permit. We appreciate this opportunity to provide our comments.
We would appreciate your response to our comments prior to the issuance of the final
permit. If you have questions or need additional information, please contact Ron Lewis
[phone].
Sincerely,
John S. Carter, Technical System Manager
Environmental Division
Electric System Support
xc: Mr Mike Parker, NCDEHNR, Mooresville, N.C.
P,51ec o; recYc-t- od4 -

-m
COMMENTS ON DRAFT NPDES PERMIT
NO. NC0004987 FOR MARSHALL STEAM STATION
The cover letter to the draft NPDES permit indicated that an Acute Toxicity testing
requirement was added to outfall 001. This was not reflected in the permit and we
request that this not be added in the final permit, as comparison of intake and discharge
data on Form 2C submitted with the permit application did not indicate a problem with
toxics in the effluent. Only once through non -contact cooling water is pumped from the
intake and discharged at this outfall.
As a general editorial comment about the permit, we suggest that the same terminology
for a given function or discharge be used throughout the permit. For example, when
referring to the effluent from the ash basin at outfall 002, we suggest you maintain the
same name, "ash -settling basin discharge", throughout the permit.
1. SUPPLEMENT TO PERMIT COVER SHEET:
In paragraph number 1 we suggest changing "ash pond wastewater" to
"ash -settling basin discharge" and that the following be inserted after (003):
"from induced draft fan control house".
• In paragraph number 2 we suggest that the following be inserted after CA:
"waters".
C Fflll�lQ1' � q��E
2. PART I, SECTION A.(1). EFFLUENT LIMITATIONS AND
5 MONITORING REQUIREMENTS FINAL FOR OUTFALL 001
kso�z„oJ 3(-43)9 In the first sentence we suggest inserting a comma after the word expiration
2���'� • We request the daily grab sampling for pH (limit of 6 to 9 standard units) and
monthly grab sampling for Manganese. Cadmium. and Sulfates added to
monitoring requirements for outfall 001 be omitted, as no by-products of coal
combustion are added to this effluent. Review of intake and discharge data
for these respective parameters on Form 2C submitted with the permit
application indicates that concentrations of cadmium and sulfates were below
State water quality standards and that manganese concentrations (0.48 and
0.47 mg/L, respectively) were above the water quality standard of 250 ug/L
for WS Classes. However, this is attributed to the use of hypolimnetic water
(water 60 to 70 feet below the full pond level of Lake Norman) for condenser
�.�s kA3 to t4u W( cooling from late spring through early fall. The 316(a) demonstration study
"_h�d on-going environmental monitoring for Marshall Steam Station indicated
no adverse impact to the "balanced indigenous populations" of Lake Norman
associated with the use of hypolimnetic water for cooling of heated effluent.
• In the last sentence of the next to last paragraph we suggest changing the
wording from "...outside the 316(a) zone" to "...outside the approved 316(a)
mixing zone".
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3. PART I, SECTION A.(2). EFFLUENT LIMITATIONS AND
MONITORING REQUIREMENTS FINAL FOR OUTFALL 002
• In first sentence we suggest inserting a comma after the word expiration.
• Based on compliance histoiy with Oil/Grease, Total Suspended Solids (TSS),
Total Copper, Total Iron, Total Arsenic, and Total Selenium, we request that
the moitoring frequency for these parameters be reduced from twice per month
to once per month.
cr R qz3 .�zCb)(9� . We request that the 0 ,mgL da ly i un.,llmit_ foxjota1 S su pgnded_Soli.ds
be changed to a 65 mg/L daily maximum limit, as in the current permit.
• In the * footnote, we suggest inserting word d "discharg a after the word
pea4�l�..s- gg
"basin".
• In the *** footnote, we suggest changing "12.4%" to "12%" as is stated in
Part III, Condition M and the current pemit. Also, we suggest that a reference
to Part III Condition M be included in this footnote.
• In the third from last paragraph or sentence of this page, we suggest changing
"...ash basin" to "...ash -settling basin discharge" for consistency throughout
the permit.
• In the last sentence of the next to last paragraph on this page, we request that
the word "daily" be changed to "weekly". We feel that weekly grab
monitoring for pH, as in the current permit is representative of this parameter
in the effluent of the ash -settling basin discharge.
4. PART I, SECTION A.(3). EFFLUENT LIMITATIONS AND
MONITORING REQUIREMENTS FINAL FOR OUTFALL 003
• In the first sentence we suggest inserting a comma after the word expiration,
and changing the wording from "induced draft fan control house cooling
water" to "non -contact cooling water discharge from induced draft fan control
house" for consistency with wording in the supplemental cover sheet page.
"'3 `' N6� • Following review of the Form 2C data submitted with this permit application,
we request that the monitoring requirements for Flow, Temperature, Total
Residual Chlorine. Free Available Chlorine. and pH and associated footnotes
CUIVO-PAX
kA% Tthro,.
added in the new permit be omitted. Chlorine is not added to this effluent, as
only non -contact cooling water is discharged from this outfall. °d; ,V.�t
• We request that the last sentence of the next to last paragraph on this page, L --
"Effluent monitoring shall be conducted weekly by grab samples." be deleted.
5. PART II, SECTION C.5.c.(3)
• Check the reference to Part II, E. in this sentence, as we suggest that "(B)"
should be changed to "(2)".
6. PART III,
• Two similar pages for Conditions E through M were included in the permit.
We suggest keeping the page requiring the following changes: in Condition F

change "authorizatio ffro" to "authorization from" and in Condition I insert a
comma after the phrase "ion exchange water treatment system".
• In Condition M, we suggest that the last line of the mailing address be
changed to read "Raleigh, North Carolina 27607".
• In Condition O, we suggest correcting "Federa" to "Federal" and "elsewher"
to "elsewhere" in the first sentence..
• In Condition P.6, we suggest adding subscripts to chemical formulas,
"NT aBrO, (NH)CO, NHOH, (NH)BF", to read "NaBrO3, (NH3)CO2, NH3OH,
( "`H4)HF2"-
• We request the following condition be added to Part III, "If the permittee, after
Mun monitoring for at least six months, determines that he is consistently meeting
—'^"'s "A IA6N the effluent limits contained herein, the permittee may request of the Director
that the monitoring requirements be reduced to a lesser frequency.".

State of North Carolina
";. Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
May 16,1995
Mr. John S. Carter, Technical Systems Manager
Electronic Systems Support/Environmental Division
Duke Power Company
1339 Hagers Ferry Road
Huntersville, North Carolina 28078-7929
Dear Mr. Carter:
ERRONh'ENTAL PROTECTION SECTION
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MAY 2 2 1995
FILE AS -704 �S
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Subject: NPDES Draft Permit
Permit No. NC0004987
Duke Power Company
Marshall Steam Station
Catawba County
The Division is forwarding draft NPDES Permit No. NCO004987 for your review. You have thirty (30)
days from receipt of this letter in which to review this permit and send comments on its requirements. The
comments should be addressed:
Mr. David A. Goodrich
NCDEHNR/WQ Section
P.O. Box 29535
Raleigh, North Carolina 27626-0535
The enclosed draft permit is substantially similar to your existing permit. The primary differences
between the draft permit and your existing permit include:
Monthly monitoring for Manganese, Cadmium and Sulfates have been added for outfall 001 due
the reasonable potential for these constituents to be present in the effluent in quantities at or near the
water quality standard. Additionally, an Acute Toxicity testing requirement has been added to
outfall 001 due to the presence of metals and toxics in the effluent.
Based on current effluent analysis the Total Arsenic and Total Selenium limits are deleted for outfall
002. However, due to the reasonable potential that these constituents to be present in the effluent in
quantities at or near the water quality standard, monitoring for Total Arsenic and Total Selenium
remain in th- -
A free available chlorine limit of 0.2 mg/l (Monthly Average) and 0.5 mg/1(Daily Maximum) has
been added for outfall 003 based on the requirements of 40 CFR Part 423.
If you wish to speak with someone regarding this draft permit, please contact Dana Bolden at (919)-733-
5083, extension 518.
Sincerely,
David A. Goodrich, Supervisor
NPDES Group
cc: Central Files
Mooresville Regional Office
Mr. Roosevelt Childress, EPA
Permits and Engineering Unit (Dana Bolden)
P.O. Box 29535, Raleigh, North Carolina 27626-05$5 - Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 509/6 recycled/ 10% post -consumer paper

is hereby authorized to:
Permit No. NC0004987
SUPPLEMENT TO PERMIT COVER SHEET
Duke Power Company
a'sk se,iAl;A-� basi r\ 4 sc-.a rgp-
I
1. Continue to discharge once -through cooling water and intake screen backwash (outfall 001); a&h­
pond
e3 (outfall 002) consisting of domestic wastewater, wastewater from yard sumps, ash
removal lines, stormwater runoff, and metal cleaning wastewater; and non -contact cooling water
discharge (003),Iocated at Marshall Steam Station, at the intersection of N. C. Highway 150 and
NCSR 184rrell, Catawba County, (See Part III of the Permit), and
2. Discharge from said treatment works at the locations specified on the attached map into the Catawba
River (Lake Norman) which is classified Class WS -IV and B CAAinthe Catawba River Basin.
W al ers
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A. (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL
Permit No. NC0004987 -
During the period beginning on the effective date of the permit and lasting until expiratietored
Permittee is authorized to discharge from
outfall(s) serial number 001, once through cooling water. Such discharges shall be limited and by the Permittee as specified below:
Effluent Characteristics Discharge —Limitations Monitoring Requirements
Units (specify) - L _ VA- z 11
Avg.Daily Max. Monthiv. Avql Daily Max, Freguency Type Location
Flow
Temperature
(October 16 - June 30)
Temperature
(July 1 - October 15)
'D � � �
Cadmium
Sulfates
Sample locations: E - Effluent
33.3 °C
34.4 °C
Daily Pump Logs or similar reading E
7,
Daily Grab E
Daily Grab E
Monthly Grab
Monthly Grab E
Monthly Grab E
pH shall not be less than 6.0 starar s an ar units at the effluent. Effluent monitoring shall be conducted daily by grab
samples.
Chlorination of the once through cooling water shall not be allowed at this facility. Should Duke Power wish to chlorinate the once through cooling water
a permit modification must be re ue • d prior to initiation of chlorination.
The Regional Administrator has determined pursuant to Section 316(a) of the Act that the thermal component of the discharge assures the protection "and
propagation of a balanced, indigenous population of shellfish and wildlife in and on the receiving body of water. Water quality temperature
standards must be maintained outside the.W16 (a)one.
o fPyou e a m �j
There shall be no discharge of floating solids gr visible foam in other than trace amounts.
4

A. (2). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL
Permit No. NC0004987
During the period beginning on the effective date of the permit and lasting until expirati
DPermittee is authorized to discharge from
outfall(s) serial number 002, ash settling basin discharge. Such discharges shall be limited and stored by the Permittee as specified below:
Effluent Character[st_ ics Discharge Limitations
Ibs/day Units (specify
Monthly. Avco Daily Max Monthly., _Avg. Daily _Max.
Flow
Oil and Grease
Total Suspended Solids"
Total Copper
Total Iron
Total Arsenic
Total Selenium
Zinc
Total Phosphorous
Total Nitrogen (NO2+Nb3+TKN)
Chronic Toxicity***
Pollutant Analysis""
9.0
20.0
1.0
1.0
mg/I 12.0 mg/I
mg/l 6549p0-wq�mg/I
mg/I 1.0 mg/I
mg/1 1.0 mg/I.
Monitoring Requirements
Measurement Sample
Frequency Type
We k1 Pump Logs or similar reading
/month My r5-�e, Grab
C2/month
/month 900 P1044 Grab
month Grab
month Grab
month Grab
Grab
01st 1 ry$
Sample locations: E - Effluent of the 49ttling basi*rior to mixing with any other waste stream.
Grab
Grab
Grab
Grab
Location,
E
E
E
E
E
E
E
E
E
E
A monthly average of 40.0 mg/1 is permitted provided that the Permittee can satisfactorily demonstrate that the difference between 20.0 mg/1 and
40.0 mg/1 is due to the concentration of total suspended solids in the source body.
Chronic Toxicity (Ceriodaphnia) PIF @ 124X0°Io; February, May, August, and November.— � � Part 1 llj
Co h
**** Annual Pollutant Analysis -see Part III, Condition N. �;n �,'�ha►�e
asl,�set�l;,n�
The metal cleaning waste, coal pile runoff, ash transport water, low volume waste, and domestic wastewater shall be discharged into the a&h4wik.
WPey
The pH shall not be less than 6.0 standard units nor greater than
9.0 standard units at the effluent. Effluent monitoring shall be conducted�y by grab
samples.
There shall be no discharge of floating soli
ds or visible foam in other than trace amounts.

A. (3). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL
Permit No. N00004987
During the period beginning on.the effective date of the permit and lasting until expirati,t e Permittee is authorized to discharge from
outfall(s) serial number 003, induced draft fan control house ce@ing w.&t= Such discharges sh be limited and monitored by the Permittee as
specified below: �InQ�_ccar,G}- �onli,n9 u^uie.r ischar j- rem
Effluent Characteristics Discharge Limitations Monitoring Requirements
."r��(\c�
lbs/day Units (�pecifyj MeasuremenA Sample 'Sample
WQ 1�__ i[1tA;rP,1to.c
Monthly. Avci.Dally Max. Monthly. Avg. Daily Max. Frequency Type Location
1T
Flow
Temperature"
Total Residual Chlorine "
Free Available Chlorine"`
----- -— Daily
* Sample locations: E - Effluent
2/Month
2/Month
0.2 mg/I 0.5 mg/I Weekly
Pump Logs or similar reading
Grab
Grab
Grab
E
E
E
** The temperature of the effluent shall be such as not to cause an increase in the temperature of the receiving stream of more than 2.8°C and in no case
cause the ambient water temperature to exceed 29°C.
***• Monitoring requirements apply only if chlorine is added to the cooling water. Neither free available chlorine nor total residual chlorine may be
discharged from any unit for more than two hours in any one day and not more than one unit in any plant may discharge free available chlorine
total residual chlorine at any one time.
There shall be no chromium, zinc, or copper added to the treatment system except as pre -approved additives to biocidal compounds. The Permittee shall
There shall be no discharge of floating solids or visible foam in other than trace amounts.
r
Permit No. N00004987
During the period beginning on.the effective date of the permit and lasting until expirati,t e Permittee is authorized to discharge from
outfall(s) serial number 003, induced draft fan control house ce@ing w.&t= Such discharges sh be limited and monitored by the Permittee as
specified below: �InQ�_ccar,G}- �onli,n9 u^uie.r ischar j- rem
Effluent Characteristics Discharge Limitations Monitoring Requirements
."r��(\c�
lbs/day Units (�pecifyj MeasuremenA Sample 'Sample
WQ 1�__ i[1tA;rP,1to.c
Monthly. Avci.Dally Max. Monthly. Avg. Daily Max. Frequency Type Location
1T
Flow
Temperature"
Total Residual Chlorine "
Free Available Chlorine"`
----- -— Daily
* Sample locations: E - Effluent
2/Month
2/Month
0.2 mg/I 0.5 mg/I Weekly
Pump Logs or similar reading
Grab
Grab
Grab
E
E
E
** The temperature of the effluent shall be such as not to cause an increase in the temperature of the receiving stream of more than 2.8°C and in no case
cause the ambient water temperature to exceed 29°C.
***• Monitoring requirements apply only if chlorine is added to the cooling water. Neither free available chlorine nor total residual chlorine may be
discharged from any unit for more than two hours in any one day and not more than one unit in any plant may discharge free available chlorine
total residual chlorine at any one time.
There shall be no chromium, zinc, or copper added to the treatment system except as pre -approved additives to biocidal compounds. The Permittee shall
There shall be no discharge of floating solids or visible foam in other than trace amounts.

2) Other significant levels of organic Chemicals must be identified and approximately quantified.
For the purpose of implementing this requirement, the largest 10 GC/MS peaks in the
purgeable base/neutral extractable, and acid extractable fractions (or fewer than 10, if less
than 10 unidentified peaks occur) for chemicals other than those specified on the APAM
Requirement Reporting Form A should be identified and approximately quantified as stated
in the APAM Reporting Form A instructions. This part (item 2) of the APAM requirement is
to be referred to as the 10 significant peaks rule".
O) Discharge of any product registered under th Federal secticide, Fungicide, and Rodenticide Act
to any wastestream which may ultimately be re ase to lakes streams or other waters of
the United States is prohibited unless specifically authorize elsewhe ' this permit. Discharge of
chlorine from the use of chlorine gas, sodium hypochlorite, or o er similar chlorination compounds
for disinfection in plant potable and service water systems and in sewage treatment is authorized.
Use of restricted use pesticides for lake management purposed by applicators licensed by the N.
C. Pesticide Board is allowed.
P) It has been demonstrated that under certain conditions it is possible to reduce the concentration of
metals in boiler cleaning wastes in the range of .92 to 99+ percent by treatment in ash ponds.
Because of dilution problems, and the existence of boundary interface layers at the extremities of
the plume, it is difficult to prove beyond doubt that the quantity of iron and copper discharged
will always be less than one milligram per liter times the flow of metal cleaning wastes when
treated in this manner.
The application of physical/ chemical methods of treating wastes has also been demonstrated to
be effective in the treatment of metal cleaning wastes. However, the effectiveness of ash pond
treatment should be considered in relation to the small differences in effluent quality realized
between the two methods.
It has been demonstrated that the presence of ions of copper, iron, nickel, and zinc in the ash pond
waters was not measurably increased during the ash pond equivalency demonstration at the Duke
Power Company's Riverbend Steam Station. Therefore, when the following conditions are
implemented during metal cleaning procedures, effective treatment for metals can be obtained at
this facility:
Large ash basin providing potential reaction volumes in the ratio of 100 to 1.
2. Well-defined shallow ash delta near the ash basin influent.
3. Ash pond pH of no less than 6.5 prior to metal cleaning waste addition.
4. Four days retention time in ash pond with effluent flow virtually stopped.
5. Boiler volume less than 86,000 gallons. �Ij i -
6. Chemicals for cleaning to include only one or more of the following: g�ALGriff5
a. Copper removal step -sodium bromate, NaBrO• ammonium carbonate, (N )C , and
ammonium hydroxide, N OH. t 3 '1
b. Iron removal step-hydrochric acid, HCl; and ammonium bifluoride, , copper
complexer, citric acid and proprietory inhibitors.
c. Neutralization step, soda ash and trisodium phosphate. R`j Ci
7. Maximum dilution of wastes before entering ash pond 6 to 1.

8. After treatment of metal deaning wastes, if monitoring of basin effluents as required by the
permit reveals discharges outside the limits of the permit, Permittee will re -close the basin
discharge, conduct such in basin sampling necessary to determine the cause of
nonconformance, will take appropriate corrective actions, and will file a report with EPA
including all pertinent data.
Q) Beginning on the effective date of this permit and lasting until expiration, there shall be no
discharge of plant wastes to the ash pond unless the Permittee provides and maintains at all times
a minimum free water volume (between the top of the sediment level and the minimum discharge
elevation) equivalent to the sum of the maximum 24-hour plant discharges plus all direct rainfall
and all runoff flows to the pond resulting from a 10 -year, 24-hour rainfall event, when using a
-runoff coefficient of 1.0. During the term of the permit, the Permittee shAll remove settled material
from the ponds or otherwise enlarge the available storage capacities in order to maintain the
required minimum volumes at all times. No later than December 31,1990 and annually thereafter,
the Permittee shall determine and report to the permit issuing authority:
1) the actual free water volume of the ash pond,
2) physical measurements of the dimensions of the free water volume in sufficient detail to allow
validation of the calculated volume, and
3) a certification that the required volume is available with adequate safety factor to include all
solids expected to be deposited in the ponds for the following year.
Present information indicates a needed volume of 723.7 A -ft in addition to solids which will be
deposited in the ash pond. Any changes to plant operations affecting such certification shall be
reported to the Director within five days.
NOTE: In the event that adequate volume has been certified to exist for the term of the permit,
periodic certification is not needed.
R) The Permittee shall report all visible discharges of floating materials, such as, an oil sheen to the
Director when submitting DMR's.
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NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0004987
PERMITTEE NAME: Duke Power Com an
FACILITY NAME: Marshall Steam Station
Facility Status: Existing
Permit Status: Renewal
Major Minor
Pipe No.: 00'i
Design Capacity: 841 MGD
Domestic (% of Flow):
Industrial (% of Flow), 100%
Comments:
Condenser Cgola Water -once through non -contact Includes in
screen backwash.
RECEIVING STREAM: the Catawba River (Lake Norman)
Class: WS -IV & B CA
Sub -Basin: 03-08-32
Reference USGS Quad: E15SW (please attach)
County:. Catawba
Regional Office: Mooresville Regional Office
Previous Exp. Date: 6/30/95 Treatment Plant Class:
Classification changes within three miles:
I
Requested by: Di i)a Bolden
Prepared bar
Date: 3/20/95
Date:
Reviewed by: t.,(Date: 10
i
Modeler
Date Rec.
#
Drainage Area (mi2y Na
Average Streamflow (cfs): n/a
s7Q10 (cfs): 60 Minimum Instantaneous Release
Toxicity Limits:
Upstream Location:
Downstream Location
Parameters:
Acute (Fathead) P / F 90 %
February, May, August, and November
not required
not required
Monthly Average Daily Maximum Frequency
Intake Flow (MGD): Monitor Monitor Daily
Temperature (October 16 - dune so): 33.3 °C (92 G F) Daily
Temperature (July i - October 15): 34.4 OC (94 ° F)
Daily
Total Residual Chlorine (mg/1): " **
Cadmium (µg/1): monitor *`* Monthly
Manganese (gg/I): monitor "* Monthly
Sulfates(mg/I : monitor *'* Monthly
[ Highest value of , S03, SO4 to be used for Sulfates l
There shall be no discharge of floating solids or visble foam in other than trace amounts.
Or similar reading.
" Chlorination of the once through cooling water shall= be allowed at this facility.
Should Duke Power wish to chlorinate its once through cooling water, a permit
modification must be requested and received prior to commencing chlorination.
*** Due to elevated levels presented in current and previous application(s).
The Regional Administrator has determined pursuant to Section 316 (a) of the Act that
the thermal component of the discharge assures the protection and propagation of a
balanced, indigenous population of shellfish and wildlife in and on the receiving body of
water. Water quality temperature standards must be maintained outside of the approved
316(a)zone.

39
39
39
39
3
39
I i'UZ '03 5/'Ju" '04 — - -
41
S I {+. •I
L _y
4 _ ! f 002
40 ri/�l ,-r j ) an
u � .Ye ✓ ll�- _ _ SII
827
39 s Suo9a1 on C 4.
i� :F+I�verplani '
0 01
38 Terrell
51 J
-�. _ "•\ . !! 'moi �_,7. -_
37 1 SCALE 1:24000
1 7 0 1 MILE
1000 0 1000 2000 3000 4000 5000 6000 7000 FEET
------------
j 1 .5 0 1 KILOMETER
CONTOUR INTERVAL 10 FEET -
FIGURE USGS TOPOGRAPHIC MAP OF THE AREA
AROUND MARSHALL STEAM STATION
MN'
I GN
3-
53 MILS [-10 2� MIL
• •R/1L • IT69— W I
'S bclv�J o��iall
1Db3
thC'R5��01i1t
- r >
�.Gl'T1t.
Y•�ourt UeNCrGs
u�c-��arop ��s3
to 003 13 PAIsc, Nb-'
pms,blg) m 1t wj%&
iDC Maectc-s- I a bb
A No f N IkC- c.K'te1 J5%%(
I rointar-mw w1onl,'t6
pecig o.—

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
FACT SHEET FOR WASTELOAD ALLOCATION
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Once through cooling water
Note addition of cadmium, manganese, and sulfateg; request comment on necessity. JGKC-
Request comment on necessity of toxicity tes '.e Chroni Qrtly P/F at 90%)
Ca�pGi Cct,�i rm inc��cc4 rnt� v/�
,l ( a Woclpis)
pt
-Tl+r,��� bti �C C
faA • . .
Special Schedule Requirements and additional comments from Reviewers:
Recommended k:�`d _ _'-- -'-� Date: 1 9S
Farrell Keough j
Reviewed by '' r r'
Instream Assessment: Date: l
Regional Supervisor. Date:
Permits �
RETURN TO TECHNICAL SUPPORT BY:
X � acaE •-GG��MtD ,orJ 7r -A<
Date: ��_
M AY 1 1995
N.C. DEPT. OF
4NVIR0N*:1ENT, HEALT14,
& NATURAL RESOURCFS
APR 1995
DIVISION OF ENVIROYMENTAL MANAGEMENT
MOORESVILLE REWHAL OFFICE
Request # 8271
Duke Power Company - Marshall Steam Plant
NC0004987 - 001
Industrial - 100%
Existing
Renewal
Catawba River [Lake Norman]
WS -IV & B CA
03-08-33
Catawba
Stream Characteristic:
Mooresville
US GS #
Bolden
Date:
3/21/95
Drainage Area (mi2):
n/a
E 15 SW
Summer 7Q10 (cfs):
60 minimum
Winter 7Q10 (cfs):
instantaneous release
Average Flow (cfs):
n/a
30Q2 (cfs):
IWC (%):
95.6%
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Once through cooling water
Note addition of cadmium, manganese, and sulfateg; request comment on necessity. JGKC-
Request comment on necessity of toxicity tes '.e Chroni Qrtly P/F at 90%)
Ca�pGi Cct,�i rm inc��cc4 rnt� v/�
,l ( a Woclpis)
pt
-Tl+r,��� bti �C C
faA • . .
Special Schedule Requirements and additional comments from Reviewers:
Recommended k:�`d _ _'-- -'-� Date: 1 9S
Farrell Keough j
Reviewed by '' r r'
Instream Assessment: Date: l
Regional Supervisor. Date:
Permits �
RETURN TO TECHNICAL SUPPORT BY:
X � acaE •-GG��MtD ,orJ 7r -A<
Date: ��_
M AY 1 1995
N.C. DEPT. OF
4NVIR0N*:1ENT, HEALT14,
& NATURAL RESOURCFS
APR 1995
DIVISION OF ENVIROYMENTAL MANAGEMENT
MOORESVILLE REWHAL OFFICE

s
PARAMETERS
Existing Limits:
Monthly Average Daily Maximum Frequency Sample Type
Intake Flow (MGD): Monitor Monitor Daily Pump Logs*
Temperature (October 16 - June 30): 33.3 °C (92 U F) Daily Grab
Temperature (July 1- October 15): 34.4 OC (94 U F) Daily Grab
Total Residual Chlorine (mg/1): ** **
Recommended Limits:
Monthly Average Daily Maximum Frequency Sample* Type
Intake Flow (MGD):
Monitor Monitor
Daily
Pump Logs*
Temperature (October 16 - June 30):
33.3 °C (92 o F)
Daily
Grab
Temperature (July i - October 15):
34.4 oC (94 o F)
Daily
Grab
Total Residual Chlorine (mg/1):
**
**
Cadmium (µg/1):
monitor ***
Monthly
Grab
Manganese (µg/1):
monitor ***
Monthly
Grab
Sulfates (mg/1):
monitor ***
Monthly
Grab
[ Highest value of S, S03, SO4 to be used for Sulfates ]
There shall be no discharge of floating solids or visble foam in other than trace amounts.
* Or similar reading.
** Chlorination of the once through cooling water shall not be allowed at this facility. Should
Duke Power wish to chlorinate its once through cooling water, a permit modification must be
requested and received prior to commencing chlorination.
*** Due to elevated levels presented in current and previous application(s).
The Regional Administrator has determined pursuant to Section 316 (a) of the Act that the
thermal component of the discharge assures the protection and propagation of a balanced,
indigenous population of shellfish and wildlife in and on the receiving body of water. Water
quality temperature standards must be maintained outside of the approved 316 (a) zone.

INSTREAM MONITORING REQUIREMENTS
Upstream Location: not required
Downstream Location: not required
Parameters:
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Special Instructions or Conditions
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.
e
3
INSTREAM MONITORING REQUIREMENTS
Upstream Location: not required
Downstream Location: not required
Parameters:
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Special Instructions or Conditions
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

PERMIT NO.: NC0004987
PEPJvl EE NAME:
FACILITY NAME:
Duke Power Company
Marshall Steam Station
Facility Status: Existing
Permit Status: Renewal
NPDES WASTE LOAD ALLOCATION
Modeler
Date Rec.
#
SAA�n1
3 aL I `I S
z"i
Drainage Area (min): Na
Average Streamflow (cfs): n/a
s7010 (cfs): 60 Minimum Instantaneous Release
r
1
Y
Y
�
Major Minor Toxicity Limits: Chronic (Ceriodaphnia) P / F 12.4%
February, May, August, and November
Pipe No.: 002
Upstream Location: not required
Design Capacity: 5.5 MGD Downstream Location: not required
Parameters:
Domestic (% of Flow):
Industrial (% of Flow): 100% Monthly Average Daily Maximum Frequency
Flow (MGD): Monitor Monitor Weekly
Oil & Grease (mg/1): 9.0 12.0 / month
Comments: Total Suspended Residue (mg/I): 20.0 * 50.0 * / month
Ash Basin Discharge' Includes sanitary system and storm water, Total Copper (mg/1): 0.9 0.9 / month
Total Iron (mg/1): 0.9 0.9 / month
pH (SU): 6-9 Weekly
Total Arsenic (µg/1): monitor / month
Total Selenium (gg/I): monitor / month
RECEIVING STREAM: the Catawba River (Lake Norman) Zinc (gg/I): monitor Monthly
Total Phosphorus (mg/1): monitor Monthly
Class: WS -1V & B CA Total Nitrogen mg/1): monitor Monthly
[NO2+NO3+TK ]
Sub -Basin: 03-08-32 Pollutant Analysis ** Annually
Reference USGS Quad: E15SW (please attach)
County: Catawba
Regional Office:_ Mooresville Regional Office
Previous Exp. Date: 6/30/95 Treatment Plant Class:
Classification changes within three miles:
l
Requested by: Dana olden
Prepared bz=-
� -- -- -
Reviewed by:�
Date: 3/20/95
Date:
Date: lc l 1,C) 4
�oi7 k spoe
^�
There shall be no discharge of floating solids or visible foam in other than trace
amounts .
Effluent sampling shall be conducted at the discharge from the ash settling pond,
prior to mixing with any other waste streams.
The metal cleaning waste, coal pile runoff, ash transport water, low volume waste, and
domestic wastewater shall be discharged into the ash settling pond.
I
6a
* To prevent backsliding and overloading of assimilative capacity of this system,
recommend previous limits continue to apply. Monthly average of 40 mg/I is permitted
provided that the permittee can satisfactorily demonstrate that the difference between
20 mg/I and 40 mg/I is due to the concentration of total suspended solids in the source
body. Note, per 423.12 (b) (9) and subject to provisions of paragraph (b) (10), the
maximum concentration of Total Suspended Residue for any given time is 50 mg/I.
** The permittee shall conduct a test for pollutants annually at the effluent from the
treatment plant. Part III, Condition O.

0
FACT SHEET FOR WASTELOAD ALLOCATION
Request # 8272
Facility Name: Duke Power Company - Marshall Steam Plant
NPDES No.: NC0004987 - 002
Type of Waste: Industrial - 99.8 % Domestic - 0.2 %
Facility Status: Existing
Permit Status: Renewal
Receiving Stream: Lake Norman [Holdsclaw Creek arm]
Stream Classification: WS - IV & B CA
Subbasin: 03-08-32
County: Catawba Stream Characteristic:
Regional Office: Mooresville USGS #
Requestor: Bolden Date:
Date of Request: 3/21/95 Drainage Area (mi2): n/a
Topo Quad: E 15 SW Summer 7Q10 (cfs): 60 minimum
Winter 7Q10 (cfs): instantaneous release
Average Flow (cfs): n/a
30Q2 (cfs):
IWC M: 12.4%
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Staff Report indicates that this, [002] discharge, (from the ash basin) includes sanitary
system, (small package plant averaging 0.011 mgd), wastewater from yard drainage
sumps and ash removal lines, stormwater, intake screen backwash, and periodic (3
years) metal cleaning wastewater, [constituents from this include ammonium
hydroxide, hydrochloric acid, ammonium carbonate, soda ash, tri -sodium phosphate,
citric acid, sodium bromate, ammonium bifluoride, copper complexer].
Special Schedule Requirements and additional comments from Reviewers:
Recommends—d 1—ry
Instream
Regional
Permits &
RETURN TO TECHNICAL SUPPORT BY:
rvu--'
_ Date:
-Date:
Date: /S
_ Date: 5 'A
M AY 1 8 IM

PARAMETERS
xi n '
Monthly Average
Daily Maximum
Frequency
Sample Type
Flow (MGD):
Monitor
Monitor
Weekly
Pump Logs
Oil & Grease (mg/1):
9.0 **
12.0 **
2 / month
Grab
Total Suspended Residue (mg(1):
20.0 ***
65.0 ***
2 / month
Grab
Total Copper (mg/1):
1.0 *****
1.0 *****
2 / month
Grab
Total Iron (mg/1):'
1.0 *****
1.0 *****
2 / month
Grab
pH (SU):
6 -9
Weekly
Grab
Total Arsenic (µg/1):
415.0 ******
2 / month
Grab
Total Selenium (µg/1):
41.0 ******
2 / month
Grab
Zinc (µg/1):
monitor
Monthly
Grab
Total Phosphorus (mg/1):
monitor
Monthly
Grab
Total Nitrogen (mg/1):
monitor
Monthly
Grab
[ NO2 + NO3 + TKN ]
Chronic Toxicity: ****
Quarterly
Grab
Pollutant Analysis *******
Annually
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Effluent sampling shall be conducted at the discharge from the ash settling pond, prior to
mixing with any other waste streams.
The metal cleaning waste, coal pile runoff, ash transport water, low volume waste, and
domestic wastewater shall be discharged into the ash settling pond.
* Or similar reading
** One additional grab sample shall be collected and analyzed for oil and grease, and total
suspended solids during the period of expected flow for each rainfall event exceeding 1.25
inches per day (25% of the 10y24h event). The corresponding flow shall be reported. The
permittee shall report the presence of cenospheres observed in the samples. After monitoring
for a period of one year, the permittee may request reduction or elimination of this monitoring.
[ 1990 permit language - not included on 1993 update]
*** Monthly average of 40 mg/l is permitted provided that the permittee can satisfactorily
demonstrate that the difference between 20 mg/1 and 40 mg/l is due to the concentration of total
suspended solids in the source body.
**** Chronic (Ceriodaphnia) Toxicity P / F at 12%: February, May, August, and November.
***** per 40 CFR 423.12 (b) (5).
****** based on WQ standard, 60 cfs, and 5.3 mgd discharge
******* The permittee shall conduct a test for pollutants annually at the effluent from the
treatment plant. Part III, Condition O.

.t
PARAMETERS
VRM�uu-W-$
Average
Daily Maximum
Frequency
Sample Type
Flow (MGD): Monitor
Monitor
Weekly
Pump Logs
Oil & Grease (mg/1): 9.0 **
12.0 **
2 / month
Grab
Total Suspended Residue (mg/1): 20.0 ***
50.0 ***
2 / month
Grab
Total Copper (mg/1): 0.9 *****
0.9 *****
2 / month
Grab
Total Iron (mg/1): 0.9 *****
0.9 *****
2 / month
Grab
pH (SU):
6 -9
Weekly
Grab
Total Arsenic (µg/1):
monitor ******
2 / month
Grab
Total Selenium (µg/1):
monitor ******
2 / month
Grab
Zinc (µg/1): monitor
Monthly
Grab
Total Phosphorus (mg/1): monitor
Monthly
Grab
Total Nitrogen (mg/1): monitor
Monthly
Grab
[ NO2+ NO3+ TKN 1
Chronic Toxicity: ****
Quarterly
Grab
Pollutant Analysis *******
L-5 htZ)JCL CkK+, AI
�,•,�,rc,� w�
Annually
wee &
v
ihan
There shall be no discharge of floating solids
or visible foam in other trace
amounts.
Effluent sampling shall be conducted at the discharge from the ash settling pond, prior to
mixing with any other waste streams.
The metal cleaning waste, coal pile runoff, ash transport water, low volume waste, and
domestic wastewater shall be discharged into the ash settling pond.
* Or similar reading
** To prevent backsliding and overloading of assimilative capacity of this system, recommend' -'-7
,- previous limits continue to apply. If current 40 CFR 423.12 (b) (3) were applied, limits of
19.5 mg/1 and 26.0 mg/1 (Monthly Ave., Daily Max., respectively) would apply R&Quest
Region input. ", ' � maim A k
*** To prevent backsliding and overloading of assimilative capacity of this system, recommend q
previous limits continue to apply. Monthly average of 40 mg/1 is permitted provided that the
permittee can satisfactorily demonstrate that the difference between 20 mg/l and 40 mg/1 is due
to the concentration of total suspended solids in the source body. Note, per 423.12 (b) (9) and
subject to provisions of paragraph (b) (10), the maximum concentration of Total Suspended
Residue for any given time is 50 mg/1. R&g-uest Region input.
V ****Chronic (Ceriodaphnia) Toxicity P / F at 12.4%: February, May, August, and November.
***** per 40 CFR 423.12 (b) (5) and a total metal cleaning quantity of 0.8853 mgd from page 14
of the Supplemental Information package. ,00
****** Current SOP using Toxics Analysis spreadsheet indicates that predicted maximum
quantities of Arsenic and Selenium would be below allowable. Due to strong possibility
of these constituents in the wastewater, rpcommend continued monitoring. Request Region
input. CPtieCLCACL i,4 7 4*a/ - /64--0JIft'dc(-h&J
******* The permittee shall conduct a test for pollutants annually at the effluent from the
treatment plant. Part III, Condition O.

INSTREAM MONITORING REQUIREMENTS
Upstream Location: not required
Downstream Location: not required
Parameters:
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS .ANEOUS INFORMATION & SPECIAL CONDITIONS
AAd quacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

Facility Name Duke Power - Marshall Steam Plant Permit # NC0004987-002
CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina
Chronic Bioassay Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or
significant mortality is 12.4 % (defined as treatment two in the North Carolina procedure
document). The permit holder shall perform qur r monitoring using this procedure to
establish compliance with the permit condition. The first test will be performed after thirty
days from the effective date of this permit during the months of February, May,
August, and November. Effluent sampling for this testing shall be performed at the
NPDES permitted final effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the
Effluent Discharge Monitoring Form (MR -1) for the month in which it was performed, using
the parameter code TGP3B. Additionally, DEM Form AT -1 (original) is to be sent to the
following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, N.C. 27607
Test data shall be complete and accurate and include all supporting chemical/physical
measurements performed in association with the toxicity tests, as well as all dose/response
data. Total residual chlorine of the effluent toxicity sample must be measured and reported if
chlorine is employed for disinfection of the waste stream.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly
monitoring will begin immediately until such time that a single test is passed. Upon passing,
this monthly test requirement will revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina
Division of Environmental Management indicate potential impacts to the receiving stream, this
permit may be re -opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, spch as minimum
control organism survival and appropriate environmental controls, shall cons ,Vtute an invalid
test and will require immediate retesting(within 30 days of initial monitoring event). Failure to
submit suitable test results will constitute noncompliance with monitoring requirements.
I
7Q10 60 cfs - -
Permitted Flow 5.5 MGD Recommend - -M
IWC 12.4 % Farrell KewO
Basin & Sub -basin 03-08-32
Receiving Stream Lake Norman ;fl
County Catawba Date to App j i
QCL PIF Version 9191

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0004987
PERM=E NAME: Duke Power Company
FACILITY NAME: Marshall Steam Station
Facility Status: Existing
Permit Status: Renewal
Major
Pipe No..
003
Design Capacity:
Minor
0.2 MGD
Domestic
(%
of
Flow):
Industrial
(%
of
Flow): 100%
Comments:
Induced Doft Fan Control House Cooling Water - once through.
non -contact.
RECEIVING S'T'REAM; the Catawba River (Lake Norman)
Class: WS -IV & B CA
Sub -Basin: 03-08-32
Reference USGS Quad: E15SW
County: Catawba
Regional Office: Mooresville Rqional Office
(please attach)
Previous Exp. Date: 6/30/95 Treatment Plant Class.
Classification changes within three miles:
Requested by:
olden
Prepared b;*w�t.-
Reviewed by:�
Date: 3/20/95
Date: i 6
ate:
Modeler
Date Rec.
#
Drainage Area (mil): n/a
Average Streamflow (cfs): Na
s7Q10 (cfs): 60 Minimum Instantaneous Release
Toxicity Limits:
not required
Upstream Location: not required
Downstream Location: not required
Parameters:
Flow (MGD):
Temperature (°C):
Total Residual Chlorine (gg/I):
Free Available Chlorine (mg/1):
pH (SU):
Monthly Average
monitor
monitor **
monitor ***
40 ****
Daily Maximum Frequency
Daily
2 / month
n1OT2 /month
3�HeR
100 •••* (<ak60AWeeNy
6-9 oD3 -5 to Weekly
-U%kl JNrnV'J& 1)
esnlpl �'
os�
s
THERE SHALL BE NO CHROMIUM, ZINC, OR COPPER ADDED TO THE TREATMENT
SYSTEM EXCEPT AS PRE -APPROVED ADDITIVES TO BIOCIDAL COMPOUNDS.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
The permittee shall obtain authorization from the Division of Environmental Management
prior to utilizing any biocide in the cooling water. (Part III of the Permit).
* Or similar reading
** The temperature of the effluent shall be such as not to cause an increase in the
temperature of the receiving stream of more than 2.8° C and in no case cause the
ambient water temperature to exceed 290 C.
*** Monitoring requirements only apply if chlorine is added to the cooling water.
**** per 40 CFR 423.12 (b) (7) based on 0.2 mgd discharge - only applies if chlorine i
added to the cooling water:
Neither free available chlorine,nor total residual chlorine may be discharged from ar
unit for more than two hours in any one day and not more than one unit in any plan
may discharge free available or total residual chlorine at any one time unless the utility
can demonstrate to the Regional Administrator or State, if the State has NPDES
permit issuing authority, that the units in a particular location cannot operate at of
below this level or chlorination. 423.12 (b) (8)

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
FACT SHEET FOR WASTELOAD ALLOCATION
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Cooling water discharge
Special Schedule Requirements and additional comments from Reviewers:
Recommended
Instream
Regional Supervisor:
Permits & En2ineerina:
RETURN TO TECHNICAL SUPPORT BY:
Date: L , 95
-Date:
_ Date: Z �S
Date:
MAY 1 8 105
Request # 8273
Duke Power Company - Marshall Steam Plant
NC0004987 - 003
Industrial - 100%
Existing
Renewal
Lake Norman
WS- IV & B CA
03-08-32
CatawbaStream
Characteristic:
Mooresville
USGS #
Bolden
Date:
3/21/95
Drainage Area (mi2):
n/a
E 15 SW
Summer 7Q10 (cfs):
60 minimum
Winter 7Q10 (cfs):
instantaneous release
Average Flow (cfs):
n/a
30Q2 (cfs):
IWC (%):
0.5%
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Cooling water discharge
Special Schedule Requirements and additional comments from Reviewers:
Recommended
Instream
Regional Supervisor:
Permits & En2ineerina:
RETURN TO TECHNICAL SUPPORT BY:
Date: L , 95
-Date:
_ Date: Z �S
Date:
MAY 1 8 105

PARAMETERS
Existing-, Limits:
THERE SHALL BE NO CHROMIUM, ZINC, OR COPPER ADDED TO THE
TREATMENT SYSTEM EXCEPT AS PRE -APPROVED ADDITIVES TO BIOCIDAL
COMPOUNDS.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
The permittee shall obtain authorization from the Division of Environmental Management prior
to utilizing any biocide in the cooling water. (Part III of the Permit).
* Or similar reading
** The temperature of the effluent shall be such as not to cause an increase in the temperature of
the receiving stream of more than 2.8° C and in no case cause the ambient water temperature to
exceed 29° C.
*** Monitoring requirements only apply if chlorine is added to the cooling water.
**** per 40 CFR 423.12 (b) (7) based on 0.2 mgd discharge - only applies if chlorine is added to
the cooling water:
Neither free available chlorine nor total residual chlorine may be discharged from any unit for
more than two hours in any one day and not more than one unit in any plant may discharge free
available or total residual chlorine at any one time unless the utility can demonstrate to the
Regional Administrator or State, if the State has NPDES permit issuing authority, that the units
in a particular location cannot operate at or below this level or chlorination. 423.12 (b) (8)
Monthly Average Daily Maximum
Frequency
Sample Type
Flow (MGD):
monitor
Daily
Pump Logs*
Temperature (°C):
monitor **
2 / month
Grab
Total Residual Chlorine (µg/1):
monitor ***
2 / month
Grab
pH (SU):
6-9
Weekly
Grab
Recommended Limits:
Monthly Average Daily Maximum
Frequency
Sample Type
Flow (MGD):
monitor
may-
—Pm"-begA
Temperature (°C):
monitor **
-2+mSft-
-GrA
Total Residual Chlorine (jig/1):
monit *°*
��
i=eFctucavCr3
-GFab
Free Available Chlorine (mg/1):
100 * * * * 40 * * * *
Weekly
Grab �ab3
pH (SU):
6 - 9
Weekly
Grab
d�
THERE SHALL BE NO CHROMIUM, ZINC, OR COPPER ADDED TO THE
TREATMENT SYSTEM EXCEPT AS PRE -APPROVED ADDITIVES TO BIOCIDAL
COMPOUNDS.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
The permittee shall obtain authorization from the Division of Environmental Management prior
to utilizing any biocide in the cooling water. (Part III of the Permit).
* Or similar reading
** The temperature of the effluent shall be such as not to cause an increase in the temperature of
the receiving stream of more than 2.8° C and in no case cause the ambient water temperature to
exceed 29° C.
*** Monitoring requirements only apply if chlorine is added to the cooling water.
**** per 40 CFR 423.12 (b) (7) based on 0.2 mgd discharge - only applies if chlorine is added to
the cooling water:
Neither free available chlorine nor total residual chlorine may be discharged from any unit for
more than two hours in any one day and not more than one unit in any plant may discharge free
available or total residual chlorine at any one time unless the utility can demonstrate to the
Regional Administrator or State, if the State has NPDES permit issuing authority, that the units
in a particular location cannot operate at or below this level or chlorination. 423.12 (b) (8)

INSTREAM MONITORING REQUIREMENTS
Upstream Location: not required
Downstream Location: not required
Parameters:
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adc�juacy of Existing; Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Special Instructions or Conditions
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

Existing WLA checked: x
Staff Report: x
Topo checked: x
USGS Flows confirmed:
IWC Spreadsheet: nr
Stream Classification: x
Instream Data: nr
Regulated Minimum
Release of 60 cfs
1977: recommended limits for design flow of 14.7 mgd were BPT, [with no CFR citing]; Temperature (° F): 90 / 05,
Oil & Grease (mg/I) 10 (15), TSS (mg/l) 15 (100) - Daily Average (Daily Maximum)
1984: 001 [ once through cooling water ] Total Residual Chlorine (µg/I) 200, pH (SU) 6 - 9, and temperature language
002 [ ash pond ] flow 10.2 mgd ave, 20.9 mgd max, Oil & Grease (mg/l) 15 (20), TSS (mg/1) 30 (100), Total Copper (µg/I)
<1,000 (1,000), Total Iron (µg/I) <1,000 (1,000), pH (SU) 6 - 9 - Daily Average (Daily Maximum)
003 [ domestic discharge ] flow 0.0075 mgd BODS (mg/1) 30, TSS (mg/1) 30, pH (SU) 6 - 9, fecal coliform (/100ml) 200
004 [ material storage ] basically a stormwater discharge, limit of 50 mg/I TSS
005 [ low volume waste ] via ash pond, TSS (mg/1) 30 (100), Oil & Grease (mg/l) 15 (20) - Daily Average (Daily Maximum)
006 [ metal cleaning ] via ash pond, Total Copper (µg/I) < 1,000 (1,000), Total Iron (gg/I) < 1,000 (1,000), - Daily Average
(Daily Maximum)
1989: 001 [ once through cooling water ] Total Residual Chlorine (mg/1) 0.2 and temperature (33 °C ) language. The previous TRC
limit did not get into the Permit, (a DMR print reveals that it still does not exist for pipe 001).
002 [ ash pond ] flow 5.3 mgd., Oil & Grease (mg/1) 15 (20), TSS (mg/l) 30 (100), Total Copper (mg/l) 1.0 (1.0),
Total Iron (mg/1) 1.0 (1.0), pH (SU) 6 - 9 - Monthly Average (Daily Maximum), Arsenic (µg/1) 415,
Selenium (µg/I) 41, Daily Maximum [assume that As and Se limits were based on WQ standard], Quarterly Chronic
Toxicity Test at 12%, (based on 60 cfs and 5.3 mgd).
Staff Report indicates that this, [002] discharge, (from the ash basin) includes sanitary system, (small package plant averaging
0.011 mgd), wastewater from yard drainage sumps and ash removal lines, stormwater, intake screen backwash, and periodic
(3 years) metal cleaning wastewater, [constituents from this include ammonium hydroxide, hydrochloric acid, ammonium
carbonate, soda ash, tri -sodium phosphate, citric acid, sodium bromate, ammonium bifluoride, copper complexes].
Memorandum in file, (Trevor Clements, July 5, 1989) has rational for applying 60 cfs minimum release to this facility.
1990: facility petitioned to have the pH requirement, (that pH monitoring was to take place before mixing with the ash pond and at a
different location for the effluent sample). q iN o,tA G lu,it -t".1-1 l
1995: no changes requested by facility, but it looks as if changes in the CFR will cause new requirements, (as well as the various
metals requirements listed below). These are noted on the Fact Sheet and attached CFR notes, [engineer did not attach CFR
based limits, therefore this attached review was necessary - engineer reviewed it and added information to 423.12 (b) (3) ]
Note: J Note referMcll has an A to C Gui a Nuclear ln-house on la t notes forhmodelin e in analysis.* ""ii(frWmdp�ackag splant two agr�ted�ICJV_0o6n).q+ 49� *�T Amies
9 IY Rrud1 3s rN o rt , lrok� ca�l�1} w�
Note: there is a write-up, "NPDES Supplemental Information for Marshall SteafmStation" int a WLA file whic�i has a good
explanation of the various processes and constituents in this discharge.
Request # 8271
8272
8273
Facility Name:
Duke Power Company - Marshall Steam Plant
NPDES No.:
NC0004987
Type of Waste:
100 % Industrial
Facility Status:
Existing
Permit Status:
Renewal
Stream Characteristic:
Receiving Stream:
Lake Norman [ Holdsdaw Creek arm j
USGS #
Stream Classification:
WS IV and B CA
Date:
Subbasin:
03-08-32
Drainage Area (mi2):
County:
Catawba
Summer 7Q10 (cfs):
Regional Office:
Mooresville
Winter 7Q10 (cfs):
Requestor:
Bolden
Average Flow (cfs):
Date of Request:
3/21/95
30Q2 (cfs):
Topo Quad:
E 15 SW
IWC (%):
Existing WLA checked: x
Staff Report: x
Topo checked: x
USGS Flows confirmed:
IWC Spreadsheet: nr
Stream Classification: x
Instream Data: nr
Regulated Minimum
Release of 60 cfs
1977: recommended limits for design flow of 14.7 mgd were BPT, [with no CFR citing]; Temperature (° F): 90 / 05,
Oil & Grease (mg/I) 10 (15), TSS (mg/l) 15 (100) - Daily Average (Daily Maximum)
1984: 001 [ once through cooling water ] Total Residual Chlorine (µg/I) 200, pH (SU) 6 - 9, and temperature language
002 [ ash pond ] flow 10.2 mgd ave, 20.9 mgd max, Oil & Grease (mg/l) 15 (20), TSS (mg/1) 30 (100), Total Copper (µg/I)
<1,000 (1,000), Total Iron (µg/I) <1,000 (1,000), pH (SU) 6 - 9 - Daily Average (Daily Maximum)
003 [ domestic discharge ] flow 0.0075 mgd BODS (mg/1) 30, TSS (mg/1) 30, pH (SU) 6 - 9, fecal coliform (/100ml) 200
004 [ material storage ] basically a stormwater discharge, limit of 50 mg/I TSS
005 [ low volume waste ] via ash pond, TSS (mg/1) 30 (100), Oil & Grease (mg/l) 15 (20) - Daily Average (Daily Maximum)
006 [ metal cleaning ] via ash pond, Total Copper (µg/I) < 1,000 (1,000), Total Iron (gg/I) < 1,000 (1,000), - Daily Average
(Daily Maximum)
1989: 001 [ once through cooling water ] Total Residual Chlorine (mg/1) 0.2 and temperature (33 °C ) language. The previous TRC
limit did not get into the Permit, (a DMR print reveals that it still does not exist for pipe 001).
002 [ ash pond ] flow 5.3 mgd., Oil & Grease (mg/1) 15 (20), TSS (mg/l) 30 (100), Total Copper (mg/l) 1.0 (1.0),
Total Iron (mg/1) 1.0 (1.0), pH (SU) 6 - 9 - Monthly Average (Daily Maximum), Arsenic (µg/1) 415,
Selenium (µg/I) 41, Daily Maximum [assume that As and Se limits were based on WQ standard], Quarterly Chronic
Toxicity Test at 12%, (based on 60 cfs and 5.3 mgd).
Staff Report indicates that this, [002] discharge, (from the ash basin) includes sanitary system, (small package plant averaging
0.011 mgd), wastewater from yard drainage sumps and ash removal lines, stormwater, intake screen backwash, and periodic
(3 years) metal cleaning wastewater, [constituents from this include ammonium hydroxide, hydrochloric acid, ammonium
carbonate, soda ash, tri -sodium phosphate, citric acid, sodium bromate, ammonium bifluoride, copper complexes].
Memorandum in file, (Trevor Clements, July 5, 1989) has rational for applying 60 cfs minimum release to this facility.
1990: facility petitioned to have the pH requirement, (that pH monitoring was to take place before mixing with the ash pond and at a
different location for the effluent sample). q iN o,tA G lu,it -t".1-1 l
1995: no changes requested by facility, but it looks as if changes in the CFR will cause new requirements, (as well as the various
metals requirements listed below). These are noted on the Fact Sheet and attached CFR notes, [engineer did not attach CFR
based limits, therefore this attached review was necessary - engineer reviewed it and added information to 423.12 (b) (3) ]
Note: J Note referMcll has an A to C Gui a Nuclear ln-house on la t notes forhmodelin e in analysis.* ""ii(frWmdp�ackag splant two agr�ted�ICJV_0o6n).q+ 49� *�T Amies
9 IY Rrud1 3s rN o rt , lrok� ca�l�1} w�
Note: there is a write-up, "NPDES Supplemental Information for Marshall SteafmStation" int a WLA file whic�i has a good
explanation of the various processes and constituents in this discharge.

841.0 mgd 5.50 mgd
Parameter Outfa11001 Outfall 002 Action
Barium 0.02 mg(j " [ 11 0.09 ** 18,051 no action
Cadmium 0.1 ua/I ** [ 21 0.2 ua/I r 161 monitor 001 / no action 002
Copper 0.01 ggd "* [ 7 ] below detection limit 002ep r CFR
Iron 0.18 mdl *" [ 1 AL ] 0.08 mgtl t 8 ] no action
Manganese 480 y}g/l ** [ 200 ] 180 pgj ** [1.610 ] monitor 001 / no action 002
Nickel below detection 4.6 L&I ** [ 7091 no action
Selinium below detection 1.4 ua/I ** r 401 limit 002 oar CFR
Silver 0.2 lido ** r 0.061 below detection no action
Zinc 21 ILgd * [ 53 ] 24 14031 monitor 002 per CFR
20 Wa4** 10 UCO *"
Sulfates 333 mgj*[263 ] 244 mgj * 12,0131 monitor 001
[ highest of S, S03, SO4 ] 6.3 mgj "" 85 mg j **
[ ] allowable
* Previous application in WLA file, (no date)
** 1995 application package
Duke Power - Marshall Steam Plant N00004987

BPT
423.12 (b) : Any existing point source subject to this subpart must achieve the following effluent limitations
representing the degree of effluent reduction by the application of the best practicable control technology currently
available (BPT):
423.12 (b) (1) : The IH of all dischargers, excegi once through cooling water, shall be within the range of 6.0.9.0.
423.12 (b) (2) : There shall be no discharge of polychlorinated bio" henyl comp2unds such as those commonly used
for transformer fluid.
Outfall 002
423.12 (b) (3) : The quantity of pollutants discharged from low volume waste sources shall not exceed the quantity
determined by multiplying the flow of low volume waste sources times the concentration listed in the following table: 3
TSS (mgA): ? Daily Maximum 130 d1d Wt use as (100 mgA • quantity not specified in application)
TSS (mgA): ? Monthly Average 39' o V10�� Afire ( 30 mg/I • quantity not specified in application) 7
Oil & Grease (mg/1): ? Daily Maximum g6 - ( 20 mg/l • quantity not specified in application )
Oil 8 Grease (mgA): ? Daily-Maximermtcr� (15 mgA • !quantity not specified in application )
423.12 (b) (4) : The quantity of pollutants discharged in fly ash and bottom ash transport water shall not exceed the
quantity determined by multiplying the flow of fly ash and bottom ash transport water times the concentration listed in
the following table:
same as above 423.12 (b) (3)
423.12 (b) (5) : The quantity of pollutants discharged in metal cleanlna wastes shall not exceed the quantity
determined by multiplying the flow of metal cleaning wastes times the concentration listed in the following table:
Total Copper (mgA): 0.9 Daily Maximum (1.0 mgA 0.8853 mgd in application, page 14 )
Total Copper (mgA): 0.9 Monthly Average (1.0 mgA • 0.8853 mgd in application, page 14 )
Total Iron (mgA): 0.9 Daily Maximum (1.0 mgA • 0.8853 mgd in application, page 14 )
Total Iron (mgA): 0.9 Monthly Average (1.0 mgA • 0.8853 mgd in application, page 14 )
NOT RCRuted 001
CInun p 423.12 (b) (6) : The quantity of pollutants discharged in once through cooling water shall not exceed the quantity
w.ar. dotes ,&determined by multiplying the flow of the once through cooling water sources times the concentration listed in the
ckiOm„u,�aN _ \following table:
Free Available Chlorine (mgA): 3.25 Maximum ( 0.5 mgA • influent reported in application, page 7 )
Free Available Chlorine (mgA): 1.3 Average ( 0.2 mgA • influent reported in application, page 7 )
003
423.12 (b) (7) : The quantity of pollutants discharged in cooling tower blowdown shall not exceed -the quantity
determined by multiplying the flow of cooling tower blowdown sources times the concentration listed in the following
table:
Free Available Chlorine (mgA): 0.1 Maximum ( 0.5 mgA • 0.2 mgd reported in application, page 20 )
Free Available Chlorine (mgA): 0.04 Average ( 0.2 mgA • 0.2 mgd reported in application, page 20 )
423.12 (b) (8) : Neither free available chlorine nor total residual chlorine may be discharged from any unit for more
than two hours in any one day and not more than one unit in any plant may discharge free available or total residual
chlorine at any one time unless the utility can demonstrate to the Regional Administrator or State, if the State has
NPDES permit issuing authority, that the units in a particular location cannot operate at or below this level or
chlorination.
002
423.12 (b) (9) : Subject to the provisions of paragraph (b)(10) of this section, the following effluent limitations shall
apply to the point sources dischargers'of coal pile runoff:
TSS (mgA): 50 Maximum Concentration (for any given time)
423.12 (b) (10) : Any untreated overflow from facilities designated, constructed, and operated to treat the volume of
coal pile runoff which is associated with a 10 year, 24 hour rainfall event shall not be subject to the limitations in
paragraph (b)(9) of this section.
423.12 (b) (11) : At the permitting authority's discretion, the quantity of pollutant allowed to be discharged may be
expressed as a concentration limitation instead of a mass based limitation specified in paragraphs (b)(3) through (7)
of this section. Concentration limitations shall be those concentrations specified in this section.

BAT
001
423.13 (c) (1) : For any plant with a total rated electric generating capacity of less than 25 megawatts [ Marshall
Steam is 0.385 megawatts ] the quantity of pollutant discharged in once through cooling water shall not exceed the
quantity determined by multiplying the flow of once through cooling water sources times the concentration listed in
the following table:
same as above 423.12 (b) (6)
423.13 (c) (2) : Neither free available chlorine nor total residual chlorine may be discharged from any unit for more
than two hours in any one day and not more than one unit in any plant may discharge free available or total residual
chlorine at any one time unless the utility can demonstrate to the Regional Administrator or State, if the State has
NPDES permit issuing authority, that the units in a particular location cannot operate at or below this level or
chlorination.
003
423.13 (d) (1) : The quantity of pollutants discharged in cooling tower blowdown shall not exceed the quantity
determined by multiplying the flow of cooling tower blowdown sources times the concentration listed in the following
table:
The 126 priority pollutant (Appendix A) contained in chemicals added for cooling tower maintenance should be non-
detectable, except;
Free Available Chlorine (mg/1): 0.1 Maximum ( 0.5 mg/l • 0.2 mgd reported in application, page 20 )
Free Available Chlorine (mg/l): 0.04 Average ( 0.2 mg/l • 0.2 mgd reported in application, page 20 )
Total Chromium (mgA): 0.04 Daily Maximum
Total Chromium (mgA): 0.04 Monthly Average
Total Zinc (mgA): 0.2 Daily Maximum
Total Zinc (mgA): 0.2 Monthly Average
( 0.2 mgA • 0.2 mgd reported in application, page 20)
( 0.2 mg/I.0.2 mgd reported in application, page 20 )
(1.0 mg/l • 0.2 mgd reported in application, page 20)
(1.0 mgA • 0.2 mgd reported in application, page 20 )
423.13 (d) (3) : At the permitting authority's discretion, instead of the monitoring specified in 40 CFR 122.11(b)
compliance with the limitations for the 126 priority pollutants in paragraph (d)(1) of this section may be determined by
engineering calculations which demonstrate that the regulated pollutants are not detectable in the final discharge by
the analytical methods in 40 CFR part 136.

February, 1995 through January, 1994
Facility Name =
Duke Power - Marshall
NPDES0=
NC0004987
Qw (MGD) =
5.50 m d
70108 (cis)=
60.00 cfs
1WC (%) =
12.44%
21.5
C.V. 0.6
FINAL RESULTS
Arsenic
Maximum Value 50.0
Max. Prod Cw
100.0
Allowable Cw
401.9
Selenium
Maximum Value 12.5
Max. Prod Cw
25.0
Allowable Cw
40.2
Zinc Maximum Value 40.0
Max. Pred Cw 112.0
Allowable Cw 401.9
atc&t )3 a:bA 4-ta,-A- Ot
ku 64)
parameter= Arsenic
standard = 50 JAW
n
BDL=1/2DL
'if 1/2 DL RESULTS
1
36.8
Std Dev. 9.4
2
50
Mean 15.6
3
21.5
C.V. 0.6
4
.23.5
5
21.7
6
29.8
Mull Factor = 2.0
7
19.7
Max. Value 50.0 Wi
8
15.2
Max. Prod CM 100.0 plyi
9
13.6
Allowable C% 401.9 µgel
10
10.4
11
14.3
12
11.1
13
19.5
14
11.8
15
10.7
16
10.4
17
14.3
18
8
19
10.4
20
10.2
21
10.8
22
10.3
23
6.6
24
8.5
25
14.5
26
12.4
27
11.2
28
21.6
29
10.5
30
10.1
31
5

February, 1995 through January, 1994
'arameter=
Selenium
Parameter=
Zinc
Standard =
5
PO
standard =
50
PO
n
BDL=1/2DL
*'rf 1/2 DL RESULTS
n
BDL=1/2DL
*if 1/2 DL RESULTS
1
9
Std Dev.
3.4
1
9
Std Dev. 9.6
2
8.9
Mean
5.9
2
2.5
*
Mean 12.8
3
9.9
C.V.
0.6
3
23
C.V. 0.7
4
6.2
4
9
5
7.1
5
2.5
6
4.9
Mult Factor =
2.0
6
14
Mutt Factor = 2.8
7
2.7
Max. Value
12.5
µgel 7
2.5
*
Max. Value 40.0 µgel
8
4.1
Max. Pred C%i
25.0
po 8
21
Max. Prod CN 112.0 µgig
9
3.8
Allowable Cw
40.2
po 9
14
Allowable C% 401.9 µgA
10
2
10
7
11
3
11
10
12
5.1
12
10
13
3.6
13
20
14
2
14
40
15
4.2.
15
10
16
2
16
10
17
3
17
18
3.4
18
19
2.5
19
20
3.9
20
21
5.3
21
22
8
22
23
8
23
24
11.2
24
25
11.9
25
26
11.4
26
27
12.5
27
28
10.8
28
29
6.4
29
30
1.6
30
31
5.2
31
4/18/95

4
SOC PRIORITY PROJECT:-. Yes
Water Quality Section
Attention: Dana Bolden
Date: April 7, 1995
"D
NPDES STAFF REPORT AND RECOMMENDATIONS
---I
County: Catawba
a r
NPDES Permit No.: NCO004987
MRO No.: 95-58
NJ
PART
I GENERAL INFORMATION
1.
Facility and Address: Marshall Steam Station
% Duke Power Company
Post Office Box 210
Terrell, N.C. 20682
2z
Date of Investigation: 'April 6, 1995
3.
Report Prepared By: Michael L. Parker, Environ. Engr. II
4.
Person Contacted and Telephone Number: Dayna Russell, (704)
875-5969.
5.
Directions to Site: The plant is on the right (north) side
of Hwy. 150 directly across from the junction of Hwy; 150
and SR 1841 (Kiser Island Road) east of the community of
Terrell,
V
Discharge Point(s), List for all discharge Points: -
outfall 001 outfall 002 outfall 003
Latitude: 35' 35' 43" 35* 36' 21" 35* 35' 52''
Longitude: 80* 57' 52" 80* 57' 35" 80* 57' 47''
Attach a USGS Map Extract and indicate treatment plant site
and discharge point on map.
USES Quad No.: E 15 SW
7.
Site size and expansion area consistent with application:
Yes. Sufficient area exists for expansion, if necessary.
8,
Topography (relationship to flood plain included): Gently
rolling, 5-10% slopes.
V
Location of Nearest Dwelling: None within 1000 feet of the
site.

Page Two
1-0. ... Receiving -Stream. or- A.ffec.t_ed-Sur-face- .Waters: - Catamh-a- Rive -r -- --
(Lake Norman
a. Classification: WS -IV and B
b. River Basin and Subbasin No.: Catawba 030832
c. Describe receiving stream features and pertinent
downstream'--se-s: Outfall 002 and 0. 3 enters - � s a portion
of Lake Norman used as the cooling water sot'_ -ci- for the
steam station. The rece4ving waters are not used for
any type of recreational purposes (such as swimming,
fishing, b^�t�g, etc.) due to the fact this area of
the lake is separated from the main body of the lake by
a concrete retaining wall that allows cooler waters
from the bottom of the lake to pass through the power
generators. Outfall 001 enters a portion of rake Norman
also separated from the main body of the Lake by a
floating boom. Access is restricted inside of the area
separated by the boom.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of Wastewater: $41 MGI? toutfall 001I_
5.5_ MGD ( d ut-f aI l O -0 2 )
Q . 2 MGI?- (outfall 6-0-5),
b. What is the current permitted capacity: Flow not
limited in Permit for any outfall.
C. Actual treatment capacity of current facility (current
design capani ty1 ; Tj./A
�?. Date(s) and construction activities allowed by previn11s
ATCs iss ued i -n the pr ev ous two years : Petfffi¢-t-' h -A-9
R' Fay+ rl a t-r-,:ry ..l t%7 lTminat-er the "@>aGkagP
°1P diysc-h r5x.fig to outfall 002 %, and re I a -c6 it -wit-11-4. POLOCowG1�
- — -- n
n aerated I oor_i.. Approval is pending on Duke Power's
request. -
e. Description of existing or substantially constructed
WWT facilities: The only existing WWT facilities
consist of a „package type" extended aeration rW.
T1
fa i iter f tln��er b n, as disposal asin nr_or to
--y a_ h b------ -
di erarge ,,,+fal 1 nr
f Descri ition „f n osed WFf+
7T ac4 1 ; i oc • cop Txro; (fl )
above- - _ = - = - - _ - - - - - -
Possible +nvi n impacts ac'tS to surface water: None
cvr,pr�tPd ----- --
h. Pretreatment Program (POTWs only): NIA
�. Residual handling and ut-ili?ation/dispos—al scheme: Ash
removed from theashdisposal basin is currently used for a
zr2ri ety !)f I - ceps ?.� authorised by Permit No. W'Q0000F3

Page Three
u Treat.men k ,Mn-t---C-1-asst fica-tion: = Less. --than ,:5. nsnts n•o
rating _(include rating sheet): Class I -(No change from
previous rating which was based on the usage of the aerated
lagoon for treatment in lieu of the package plant).
4. SIC Code(s): 4911
Wastewater Code(s):
5. MTU Code(s): 31000
Primary: 14
Secondary: 68, 16, 69
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any Public hnies. involved (municipals only)?
No
2. Special monitoring or limitations (including toxicity)
requests: None at this time
3. Important SOC/JOC or Compliance Schedule dates: N/A
4. Alternative Analysis Evaluation
a. Spray Irrigation: insufficient land area available.
b. Connect to regional sewer system: None available
within reasonable distance.
C. Subsurface: insufficient land area available:
DRAT IV - EVALUATION AND RECOMMENDATIONS
Duke Power Company (DPP) request that the subject Permit be
renewed. There has been one change to the Permit since it was
last renewed (addition of outfall 00.3). DPC pians one other
change to the existing r]NT system In the near future_ (see Part
II, No. 1(d) above). ��
Pending receipt and approval of a WLA, it is recommended
that the permit be renewed as requested,
t,
Signature of Report Preparer Date
F
Water Quality Q i oval Supervisor sato_
pohryn9ymdrad l sr
..t
s
3
Page Three
u Treat.men k ,Mn-t---C-1-asst fica-tion: = Less. --than ,:5. nsnts n•o
rating _(include rating sheet): Class I -(No change from
previous rating which was based on the usage of the aerated
lagoon for treatment in lieu of the package plant).
4. SIC Code(s): 4911
Wastewater Code(s):
5. MTU Code(s): 31000
Primary: 14
Secondary: 68, 16, 69
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any Public hnies. involved (municipals only)?
No
2. Special monitoring or limitations (including toxicity)
requests: None at this time
3. Important SOC/JOC or Compliance Schedule dates: N/A
4. Alternative Analysis Evaluation
a. Spray Irrigation: insufficient land area available.
b. Connect to regional sewer system: None available
within reasonable distance.
C. Subsurface: insufficient land area available:
DRAT IV - EVALUATION AND RECOMMENDATIONS
Duke Power Company (DPP) request that the subject Permit be
renewed. There has been one change to the Permit since it was
last renewed (addition of outfall 00.3). DPC pians one other
change to the existing r]NT system In the near future_ (see Part
II, No. 1(d) above). ��
Pending receipt and approval of a WLA, it is recommended
that the permit be renewed as requested,
t,
Signature of Report Preparer Date
F
Water Quality Q i oval Supervisor sato_
pohryn9ymdrad l sr

SOC PRIORITY PROJECT: No
To: Permits and Engineering Unit
Water Quality Section
Attention: Jeanette Powell
Date: March 24, 1995
AUTHORIZATION TO CONSTRUCT
NPDES PERMIT
REPORT AND RECOMMENDATIONS
County: Catawba
MRO No.: 95-50
Permit No. NCO004987
PART I - GENERAL INFORMATION
1. Facility and Address: Marshall Steam Station
rib Duke Power Company
13339 Hagers Ferry Road
Huntersville, N.C. 28078
2. Date of On -Site Investigation (if conducted):
3. Report Prepared By: Michael L. Parker, Environ
N/A
Engr. II
4. Persons Contacted and Telephone Number: N/A
S. Verified Discharge Point(--), List for All Discharge Points:
Latitude: 35' 36' 21" Longitude: 80° 57' 35"
Attach a USES map extract and indicate treatment facility
site and discharge point on map. Ensure discharge point(s)
correspond to NPDES permitted discharge points.
USGS Quad No.: E 15 SW
6. Site size and expansion area consistent with application?
Yes.
7. Topography (relationship to flood plain included): Hilly,
3-12% slopes. The proposed WWTP site is not located in a
flood plain.
8. Location of Nearest Dwelling: None within 1000 feet of the
site.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Existing Treatment Facility
a. Current permitted capacity: No Limit in Permit.
b. Date(s) and construction activities allowed by previous
ATCs issued in the previous two (2) years: N/A.

Page Two
C. Actual treatment capacity of the current facility
(design volume): N/A.
d. Description of existing or substantially constructed
WWT facilities: The permittee presently operates an
extended aeration WWTP (package plant) consisting of a
bar screen followed by aeration and clarification. This
facility serves.as a pretreatment facility prior to
discharging into an. ash disposal basin.
2. Type of Proposed Treatment Facility: The applicant proposes
to construct an aerated lagoon as the method of pretreatment
prior to discharging to the ash basin. The package plant is
being replaced due to its proximity to Lake Norman (<50
feet) and its collection system limits site expansion.
3. Residuals Handling and Utilization/Disposal Scheme:
Residuals are removed by a septage hauler and disposed on
sites permitted by the DEH.
4. Treatment Plant Classification (attached completed rating
sheet): Class I
5. SIC Code(s): 4911
Wastewater Code(s): Primary: 14 Secondary: 68, .16, 69
Main Treatment Unit Code: 03500
PART III - EVALUATION AND RECOMMENDATIONS
The permittee, Duke Power Company (PPC) requests approval to
construct an aerated lagoon (as pretreatment for the domestic
wastewater generated at DPC's Marshall Steam Station) as well as
assorted pumps, piping and other appurtenances necessary to
upgrade the existing wastewater collection system. The existing
WWT facility has, in years past, experienced overflows from both
the collection system and the WWTP as a result of excessive
rainfall. Although repairs have been made to the WWTP (and
collection system) to minimize the potential for future
overflows, its close proximity to surface waters and it location
on the Marshall plant site (the treatment plant location
restricts a planned steam plant expansion project) made it
possible for DPC to justify relocating the WWTP.
Pending a technical review and approval by P&E, it is
recommended that an ATC be issued.
g: �ndsr�ndsr95\marshalI.ate
Signature of Report Preparer
Water Quality Regi
Supervisor
3 -z,v 9s —
Date
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Water Chemistry in Lake Norman in the vicinity of the Marshall Steam Station,
Location Date Depth Temp DO frond pH Alk Si Fe Mn Ca Mg Na K Al Cl SO4 Zn
m C mg/L uS/cm mg-CaCO3/L mg/L mg/L pg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L ug/L
14 6 -Feb -90 0.3 15.8 10.3 59 6.6 11 1 0.2 200 3.2 1.2 4.4 1.4 0.3 4.1 9.1 4
14 9 -May -90 0.3 25 5.6 49 6 10.2 4.5 a 0.3 300 2.6 1.2 3.7 1.4 0.3 3.9 10
14 6 -Aug -90 0.3 142_ 5 �0.6 600 2.8 1.3 4.8 1.8 0.4 5.1 7.2 8
14 5 -Nov -90 0.3 10.1 0.7 0.5 500 2.6 1.1 4.3 2.2 0.7 2.9 7
14 6 -Feb -91 0.3 13.4 10.3 �50 6.7 11.3 5.2 0.2 200 3.2 1.3 4.7 1.6 0.2 4.1 10
14 1 -May -91 0.3 25.7 6.6 47 6.1 10.4 4,6 0.3 300 2.8 1.2 3.8 1.5 0.3 3.8 10
14 12 -Aug -91 0.3 29.5 0.6 65 6 16 4.6 0,5 50.0_ 3.1 1.3 4.5 1.5 0.2 5.9 3.2 10
14 5 -Nov -91:. 0.3 26A 6.6 60 6.4 13.2 5.6 0.2 200 2.5 1.3 5.4 5.2
14 5 -Feb -92 0.3 17.4 10.6 70 6.7 13.5 5.4 0.2 200 2.8 1.3 12.2 1.9 0.2 Tel 7.5 10
14 4 -Aug -92 0.3 28.4 6.3 61 6.8 12.5 3.7 0.1 100 2.7 1.2 5.5 1.6 0.2 5 10
14 2 -Nov -92 0.3 28.1 7.1 64 6.5 11.7 5 0.2 200 2.4 1.3 6.4 1.7 6
14 2 -Feb -93 0.3 15.4 10.4 50 6.6 10.6_ 4.5 0.3 300 2.8 1.2 3.7 1.6 0.2 2 4.4 10
14 3 -May -93 0.3 23.3 7.4 50 6.3 10.3 _ 4.4 0.3 300 2.8 1.1 3.4 1.6 0.2 3.1 8 10
14 4 -Aug -93 0.3 2_8._6 4.4 55 6.1 13.7 4.5 0.3 300 3.1 1.3 4A 1.4 0.2 3.8 5.3 10
14 2 -Nov -93 0.3 25.5 6.9 60 6.5 13.4 5.4 0.2 200 2.6 1.3 6.4 1.7 0.2 6.2 10
14 15 -Feb -94 0.3 15 11.2 74 6.8 14.4 5.5 0 6.8 9
14 3 -May -94 0.3 23.4 6.4 60 6.4 11.3 4.8 0.1 100 2.9 1.2 4 1.3 0.1 4.6 5
14 10 -Aug -94 0.3 32.6 1.6 74 6.2 15 4.5 0.2 200 3.1 1.3 5.7 1.6 0.1 7.4 5.2 35
14 1/19/94 0.3 24.2 7.3 58 6.6 12 4.6 0.1 100 2.7 1.3 5.6 1.7 0.1 6.1 1 5
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