NC0004987_Engineers Certification for Project No:004987A01 & 2_20161024

Duke Duke Energy Corporation
Energy® 526 South Church St.
Charlotte, NC 28202
Mailing Address:
PO Box 1006
Charlotte, NC 28201-1006
October 24, 2006
To: Sergei Chernikov
North Carolina Department of Environment
and Natural Resources
Division of Water Quality
NPDES Unit
1617 Mail Service Center p (trA tZSy wr
Raleigh,North Carolina 27699-1633
OCT 3
f.dun
Subject: Marshall Steam Station .,, ^_ t4
NPDES Permit No.NC0004987 ' ! DENR ' ; �,
L1Tl'
Engineers' Certification for
Project Number: 004987A01 and 2
Dear Dr. Chernikov:
Construction of the wastewater treatment system for the Flue Gas Desulfurization blow down at
Marshall Steam Station has been completed. Attached are the signed and stamped forms from
the professional engineers certifying that they provided oversight for construction of the major
components of the wastewater treatment system.
If you need additional information,please contact me at 704 382-4669.
Sincerely,
Rht24hRobert Wylie -
Water Management
Environment, Health and Safety
cc: Doug Mooney - ENTRIX
John Fehr—Shaw Engineering
Ray Lucinana—USFilter
Tad Broad—Fisher Tanks
www.duke-energy.com

Engineer's Certification—Project Number 004987A01
I, J/JA E ,rL i//e , as a duly registered Professional Engineer in the
State of North Carolina, having been authorized to observe(periodically/weekly/full time)the
construction of the, Constructed Wetland Treatment System, Wetland Supply Pumps and Piping
at the Marshall Steam Station, located at 8320 East NC Hwy 150 in Terrell,North Carolina
hereby state that, to the best of my abilities, due care and diligence was used in the observation
of the following installations: ;
o Wetland supply pumping station •
o All necessary piping to the wetland treatment system from the wetland supply tank.
Signatureiv/NV- FL-,
Registration No. 0. d 3
Date /0"3/0
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Mail this Certification to: NPDES Unit `�•�4 ..
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DENR/DWQ 11 030031 •
1617 Mail Service Center ' 'Raleigh;NC 27699-1633 i'ii .d•., •40.. -��

ENTRIX, Inc.
ENTRIX 50 Glenlake Parkway, Suite 600
ENVIRONMENTAL CONSULTANTS Atlanta, GA 30328
[phone] I Fax[phone]
www.entrix.com
Engineer's Certification—Project Number 004987A01
I, F. DOUGLAS MOONEY , as a duly registered
Professional Engineer in the State of North Carolina,having been authorized to observe
(periodically/weekly/full time)the construction of the, Constructed Wetland Treatment System.,
at the Marshall Steam Station, located at 8320 East NC Hwy 150 in Terrell,North Carolina
hereby state that, to the best of my abilities, due care and diligence was used in the observation
of the following installations:
o Two 1.73 million gallon equalization basins;
o Flow splitter box;
o Three (3) 3-cell, 4.5 acre wetland treatment trains operated in parallel;
o Internal outfall monitoring station; and
o All necessary plants,piping,valves and appurtenances.
diA
Signature
- / / stration No. 19579
I1..�._.�_ (!. _�• Registration
Date October 23, 2006
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Mail this Certification to: NPDES Unit -
DENR/DWQ -
`
1617 Mail Service Center0 19579 0
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Raleigh,NC 27699-1633 0 � o

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Engineer's Certification—Project Number 004987A02
I, Cl C. o-c'J , as a duly registered Professional Engineer in the
State of North Carolina, having been authorized to observe (periodically/weekly/full time) the
construction of the,Waste Water Solid Removal System Wetland Supply Tank at the Marshall
Steam Station, located at 8320 East NC Hwy 150 in Terrell,North Carolina hereby state that, to
the best of my abilities, due care and diligence was used in the observation of the following
installations:
o One (1) 47,928 gallon wetland supply tank.
0 Signature / t' C / Registration No. 031 / It
Date 1 0/2 3/D 6
Mail this Certification to: NPDES Unit
DENR/DWQ
1617 Mail Service Center
Raleigh,NC 27699-1633
,011111//1/4
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Engineer's Certification-Project Number 004987A02
I, R P� M p til D C Lu et A , as a duly registered Professional Engineer in the
State of North Carolina,having been authorized to observe (periodically/weekly/full time) the
construction of the, Waste Water Solid Removal System at the Marshall Steam Station, located
at 8320 East NC Hwy 150 in Terrell,North Carolina hereby state that, to the best of my abilities,
due care and diligence was used in the observation of the following installations:
o One (1) 177,125 gallon equalization tank;
o Wastewater forwarding pumping set;
o One (1) 191,089 gallon flocculating primary clarifier;
o Clarifier sludge transfer pump set;
o One (1) 78,719 gallon sludge holding tank;
o One (1) 7,697 gallon pre-coat tank;
o Filter press fast fill pump set;
o Filter press feed pump set;
o Three (3) 250 ft3 sludge filter presses;
o One (1) 177,125 gallon maintenance tank;
o Polymer feed system; and
o All necessary piping, valves and appurtenances.
Signatur: �•'• • /eiTRegistration No. 03 O'3 3 5-
Date
Date . -2- 4 -e
Mail this Certification to: NPDES Unit
DENR/DWQ
1617 Mail Service Center
Raleigh,NC 27699-1633
SEAL/�/�yy��� ' • . r4. N.
030335 _r '
•
•
•

D � 'Ar�9QGMichael F.Easley,Governor
William G.Ross Jr.,Secretary
} .. r North Carolina Department of Environment and Natural Resources
'—' C Alan W.Klimek,P.E.Director
Division of Water Quality
August 10, 2004
Mr. Michael A. Ruhe, Manager
Environmental Support
Duke Power
EC11E/P.O. Box 1006
Charlotte, NC 28201-1006
Subject: Authorization to Construct Permit Issuance
ATC Number 004987A01
NPDES Permit NC0004987
Catawba County
Dear Mr. Ruhe:
A request for an Authorization to Construct (ATC) was received by the Division and final plans
and specifications for the subject project have been found to be satisfactory. Authorization is hereby
granted for construction of a constructed wetland for treatment of flue-gas desulfurization wastewater
at Duke's Marshall Steam Station including the following components:
• Wastewater pumping station;
• Two 1.73 million gallon equalization basins;
• Flow splitter box;
• Three (3) 3-cell, 4.5 acre wetland treatment trains operated in parallel;
• Internal outfall monitoring station; and
• All necessary plants, piping, valves, and appurtenances.
This Authorization to Construct is issued in accordance with NPDES Permit No. NC0004987
issued January 9, 2004, and shall be subject to revocation unless the wastewater treatment facilities
are constructed in accordance with the conditions and limitations specified in the permit.
Any sludge generated from these treatment facilities must be disposed of in accordance with
G.S. 143-215.1 and in a manner approved by the North Carolina Division of Water Quality.
In the event that the facilities fail to perform satisfactorily, including the creation of nuisance
conditions, the Permittee shall take immediate corrective action, including those as may be required
by this Division, such asthe construction of additional or replacement wastewater treatment or
disposal facilities. Upon classification of the facility by the Certification Commission, the Permittee
shall employ a certified water pollution control treatment system operator to be in responsible charge
(ORC) of the water pollution control treatment system. The operator must hold a certificate of the type
and grade at least equivalent to or greater than the classification assigned to the water pollution
control treatment system by the Certification Commission. The Permittee must also employ a certified
back-up operator of the appropriate type and grade to comply with the conditions of Title 15A, Chapter
8G, .0202. The ORC of the facility must visit each Class I facility at least weekly and each Class II, III,
and IV facility at least daily, excluding weekends and holidays, and must properly manage and
document daily operation and maintenance of the facility and must comply with all other conditions
outlined in Title 15A, Chapter 8G, .0204.
NorthCarolina
Naturally
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh,NC 27699-1617 Phone[phone] Customer Service
Internet: h2o,enr.state,nc.us 512 N.Salisbury St. Raleigh,NC 27604 - FAX [phone] 1-877-623-6748
An Equal Opportunity/Affirmative Action Employer—50%Recycled/10%Post Consumer Paper

•
' Mr.Michael Ruhe
Duke Power
8/10/2004
A copy of the approved plans and specifications shall be maintained on file by the Permittee for
the life of the facility.
The Operational Agreement between the Permittee and the Environmental Management
Commission is incorporated herein by reference and is a condition of this Permit. Noncompliance with
the terms of the Operational Agreement shall subject the Permittee to all sanctions provided by G. S.
143-215.6 for violation of or failure to act in accordance with the terms and conditions of this Permit.
Failure to abide by the requirements contained in this Authorization to Operate may subject
the Permittee to an enforcement action by the Division of Water Quality in accordance with North
Carolina General Statute 143-215.6A to 143-215.6C.
The issuance of this Authorization to Construct does not preclude the Permittee from
complying with any and all statutes, rules, regulations, or ordinances which may be imposed by other
government agencies (local, state, and federal) which have jurisdiction.
One (1) set of approved plans and specifications is being forwarded to you. If you have any
questions or need additional information, please contact Mr. Mark McIntire, P.E., telephone number
[phone], extension 508.
Sincerely,
/41,64(ex:i-
lan W. Klimek, P.E.
cc: Central Files
NPDES Unit, Permit File
Mooresville Regional Office, Water Quality
Training and Certification Unit
Dan Blaisdell, P.E., Division of Water Quality, Construction Grants & Loans Section

SOC PRIORITY PROJECT: No
To: Permits and Engineering Unit �- }
Water Quality Section r
Attention: Mark McIntire 1 J U L 2 8 2004 Li
Date: July 26, 2004 i DEr�R - �dATER QUr�LITY
'.'
POINT SOURCE BRANCH .
AUTHORIZATION TO CONSTRUCT
......t.P... u.t W..trLi.A..
NPDESPERMIT ‘14--._..._r.._�.,_... �_...,_...._..._....... .. <:��
REPORT AND RECOMMENDATIONS
County: Catawba
MRO No.: 04-61
Permit No.NC0004987
PART I - GENERAL INFORMATION
1. Facility and address: Marshall Steam Station
%Duke Energy Corporation
Post Office Box 1006
Charlotte,N.C. 28201-1006
2. Date of on-site investigation(if conducted): N/A
3. Report prepared by: Michael L. Parker, Environmental Engineer II
4. Persons contacted and telephone number:No one
- 5. Verified discharge point(s), list for all discharge points:
Outfall 001 Outfall 002 Outfall 002A Outfall 002B Outfall 003
Latitude: 35° 35' 43" 35° 36' 21" 35° 35' 51" 35° 35 51" 35° 35' 52"
Longitude: 80° 57' 52" 80° 57' 35" 80° 57' 36" 80° 57' 34 80° 57'47"
Attach a USGS map extract and indicate treatment facility site and discharge point on
map.
USGS Quad No.: E 15 SW
6. Site size and expansion area consistent with application? Yes. There is ample area
available for the construction of the proposed wastewater treatment facilities.
7. Topography (relationship to flood plain included): Gently rolling, 5 - 10% slopes.

Page Two
8. Location of nearest dwelling: None within 500 feet of the site.
PART II-DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Existing treatment facility
a. Current permitted capacity:N/A(new internal outfall).
b. Date(s) and construction activities allowed by previous ATCs issued in the
previous two years: There have been no ATCs issued to this facility in the past
two years.
c. Actual treatment capacity of the current facility (design volume): There are no
current wastewater treatment facilities. The proposed treatment facilities will be
designed to treat up to 1.25 MGD (average flow), 1.44 MGD (peak flow).
d. Description of existing or substantially constructed WWT facilities: There are no
existing treatment facilities at this proposed internal outfall.
2. Type of proposed treatment facility: The applicant proposes to construct a wetlands
treatment system consisting of an influent pump station followed by dual equalization
basins that will also provide settling and thermal reduction, six wetland treatment cells
planted with bulrush for Hg and Se reduction,three wetland treatment cells that have
been divided into two secondary cells with the primary cells consisting of a limestone
cascade for aeration and the secondary cells consisting of cattails for the co-precipitation
of Hg and Se, and an effluent monitoring station*.
*It should be noted that the discharge from this wetland treatment system will not directly
enter surface waters as a separate outfall, but will be discharged into the existing ash
basin, which eventually discharges at outfall 002.
3. Residuals handling and utilization/disposal scheme: Residuals collected in the treatment
facilities will be removed for on-site disposal.
4. Treatment plant classification: Unknown at this time.
5. SIC Code(s): 4911 Wastewater code(s): 14, 68, 16, 69
Main Treatment Unit code: 31000
6. Important SOC/JOC or compliance schedule dates: This facility is neither under an
SOC/JOC nor is one being proposed.

Page Three
PART III -EVALUATION AND RECOMMENDATIONS
As a result of the Clean Smokestacks Act passed in 2002, coal-fired utilities operating in
NC must reduce their sulfur dioxide emissions. For this reason, Duke is proposing to add a flue
gas desulfurization (FGD) system at their Marshall Steam Station, which will remove solids,
selenium, and mercury from the additional wastewater stream produced by the FGD.
The FGD functions by transforming sulfur dioxide into gypsum and water. The reason
that a wetlands treatment system was chosen as opposed to a physical/chemical (P/C) system was
that the P/C systems at other coal-fired power generation facilities had exhibited inconsistent
FGD pollutant removal rates, were expensive to construct and operate, required full time
personnel for O&M,produced copious amounts of sludge, and could not handle variable
changes in coal and burner settings. The wetlands treatment system supposedly offers lower
O&M costs and personnel attention, is less expensive to build, and offers consistent performance
over a wide range of plant operating parameters. The proposed wetland treatment system will
function by stabilizing the FGD flow and concentrating the constituents of concern in the
equalization basin. The wastewater will then pass through the wetland treatment cells where
selenium and other metals will be segregated in non-bioavailable forms. Duke Power conducted
a pilot study of the viability of wetlands treatment for FGD wastewater at Clemson University in
March 2003. The effectiveness of a wetland treatment system to remove the pollutants of
concern during all seasons, while maintaining compliance with Permit limits, was evaluated.
Given this criteria, the pilot test of the wetland treatment system proved to be a reliable and
effective means of FGD wastewater treatment.
Pending a final technical review by the NPDES Unit, it is recommended that an ATC for
this facility be issued.
Signature of Report Preparer ate
IJ� /
Rx.,
Water Quality Reggal Supervisor Date
h:\atc\atc04\marshall.atc

. M.,Duke PROCUREMENT, CONSTRUCTION AND
rat Power® EH&S
A Duke Energy Company Duke Power
EC11 E/P.O. Box 1006
Charlotte, NC 28201-1006
May 21, 2004
Mr. Mark McIntire
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Suite 942
512 North Salisbury Street
Raleigh,NC 27604
Subject: Request for Authorization to Construct
Wetland Treatment System
NPDES Permit NC0004987 - Internal Outfall 004
Marshall Steam Station
Dear Mr. McIntire:
Enclosed for your review and approval is the request for Authorization to Construct
(ATC) a wetland wastewater treatment system(WWTS) at the subject station, for the
treatment of wastewater from the future Flue Gas Desulfurization(FGD) system.
Included in this request are three sets of the following ATC documents:
1. Detailed Plans and Specifications
2. Design Calculations
3. Hydraulic Profile (11"x 17")
4. Flow Schematic (8.5"x 11")
5. Final Design Report for the WWTS at Marshall Steam Station
The WWTS has been designed to treat an average flow rate of 1.25 mgd and a peak flow
rate of 1.44 mgd. The WWTS will consist of 12.7 acres of wetland plants arranged in
nine cells and piped in three parallel treatment trains. Each of the three treatment trains
includes an equalization/cooling step, two wetland treatment cells in series, a small
cascade aeration cell to increase oxygen levels and a final wetland polishing cell. The
WWTS covers 14.9 acres within a construction area of approximately 30 acres. The
wastewater is pumped from the FGD system area to the WWTS. The wastewater then
flows by gravity through the WWTS. The treated effluent is discharged out NPDES
outfall 004 into the ash basin wastewater treatment system where it discharges out
NPDES outfall 002.
www.dukepower.corn

•
If you have questions or need additional information please contact Robert Wylie of
Duke Power at 704-382-4669. Your cooperation in this request is very much
appreciated.
Sincerely,
Michael A. Ruhe, Manager
Environmental Support
cc: Doug Mooney—ENTRIX, Inc.
John Rodgers—Clemson University

05/14/04 07:28 Martin T:\ACAD\1038527_Marshall_Wetlands\Sch_Flow Dia.dwq
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1'1 DESIGN CRITERIA FOR FLOW OF 1.25 MGD*
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1A,B,C 36 1.5' ' 1.28 3 3.84 Schematic Flow Diagram
2A,B,C 36 1.5' 1.28 3 3.84 Duke Energy Corporation
3A,B,C NA 2' 0.24 3 0.72 Marshall Steam Station
4A,B,C 64 2' 1.67 3 5.0 Constructed Wetland System
*FGD Average Flow 0.680 MGD+0.57 MGD Mixing 14.92 Acres for Treatment of FGD Wastewater
\ PROJ.NO:1038527 I CK: I DATE:5/04

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§ NO REVISION.I _BY DATE f-PRgect No 1038527 I Ck 'Dale S/04

•
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;. 'State of North Carolina
Department of Environment, .47;111Vir
Health and Natural Resources 7,11jilV, 4 • •
Division of Environmental Management ° _ _ ' r
James B. Hunt, Jr., Governor Asemiimmim
Jonathan B. Howes, Secretary p E H N F .
A. Preston Howard, Jr., P.E., Director •
July 26, 1995
Mr. John S. Carter
Duke Power Company
Electric System Support Department
13339 Hagers Ferry Road
Huntersville,North Carolina 28078
Subject: Application Number AC0004987
Request for Additional Information
Duke Power-Marshall Steam Sta.
Catawba County
Dear Mr. Carter:
A letter of request for an Authorization to Construct was received on February 21, 1995 by the
Division and final plans and specifications for the subject project have been reviewed and found to be
satisfactory. Authorization is hereby granted for the installation of an aerated lagoon pretreatment facility
discharging into the ash disposal basin with final discharge of treated wastewater into the Catawba River
(Lake Norman) and construction of the following upgrades to the existing wastewater collection system:
• Powerhouse lift station,
• Unit 3/4 expelsor pump lift station,
• Transport line from GSD trailers to expelsor pump,
• Transport line from expelsor pump to Manhole S5,
• Transport line from the powerhouse lift station to the aerated lagoon,
• Transport line from the aerated lagoon to the Ash Basin,
• Installation of the Monex lift station,and
• Tie in from the existing wastewater treatment system to the new treatment system.
This Authorization to Construct is issued in accordance with Part III, Paragraph A of NPDES
Permit No. NC0004987 issued March 12, 1993 and shall be subject to revocation unless the wastewater
treatment facilities are constructed in accordance with the conditions and limitations specified in Permit No.
NC0004987.
The sludge generated from these treatment facilities must be disposed of in accordance with G.S.
143-215.1 and in a manner approved by the North Carolina Division of Environmental Management.
In the event that the facilities fail to perform satisfactorily, including the creation of nuisance
conditions, the Permittee shall take immediate corrective action,including those as may be required by this
Division,such as the construction of additional or replacement wastewater treatment or disposal facilities.
The Mooresville Regional Office,telephone number(704) 663-1699 shall be notified at least forty-
eight (48) hours in advance of operation of the installed facilities so that an in-place inspection can be
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50%recycled/ 10%post-consumer paper

•^ r s
Permit No. NC0004987 .
Authorization to Construct
Marshall Steam Station
July 26, 1995
Page 2
made. Such notification to the regional supervisor shall be made during the normal office hours from 8:00
a.m. until 5:00 p.m. on Monday through Friday, excluding State Holidays.
Upon completion of construction and prior to operation of this permitted facility, a certification
must be received from a professional engineer certifying that the permitted facility has been installed in
accordance with the NPDES Permit, this Authorization to Construct and the approved plans and
specifications. Mail the Certification to the Permits and Engineering Unit, P.O. Box 29535, Raleigh, NC
27626-0535.
Upon classification of the facility by the Certification Commission, the Permittee shall employ a
certified wastewater treatment plant operator to be in responsible charge (ORC) of the wastewater treatment
facilities. The operator must hold a certificate of the type and grade at least equivalent to or greater than the
classification assigned to the wastewater treatment facilities by the Certification Commission. The
Permittee must also employ a certified back-up operator of the appropriate type and grade to comply with
the conditions of Title 15A, Chapter 8A, .0202. Once the facility is classified,the Permittee must submit a
letter to the Certification Commission which designates the operator in responsible charge within thirty
- days after the wastewater treatment facilities are 50% complete.
A copy of the approved plans and specifications shall be maintained on file by the Permittee for the
life of the facility.
Failure to abide by the requirements contained in this Authorization to Construct may subject the
Permittee to an enforcement action by the Division of Environmental Management in accordance with
North Carolina General Statute 143-215.6A to 143-215.6C.
The issuance of this Authorization to Construct does not preclude the Permittee from complying
with any and all statutes, rules, regulations, or ordinances which may be imposed by other government
agencies (local, state, and federal) which have jurisdiction.
•
• One (1) set of approved plans and specifications is being forwarded to you. If you have any
questions or need additional information, please contactfT anette_Poowell at telephone number (919) 733-
5083, extension 537.
Sincerely,
I/
. Presto , Io ard, Jr., P.E.
cc: Catawba County Health Department
Mooresville Regional Office,Water Quality
Training and Certification Unit

• 'Permit No. NC0004987
- Authorization to Construct
Marshall Steam Station
July 26, 1995
Page 3 •
Engineer's Certification
I, , as a duly registered Professional Engineer in the State of North
Carolina,having been authorized to observe (periodically,weekly, full time)the construction of the
project, , for the
Project Name Location
Permittee hereby state that, to the best of my abilities, due care and diligence was used in the observation
of the construction such that the construction was observed to be built within substantial compliance and
intent of the approved plans and specifications.
Signature Registration No.
Date

- I • •
•
SOC PRIORITY PROJECT: No
To: Permits and Engineering Unit
Water Quality Section
Attention: Je?n_P _ _ o�;el l ••�,
Date : March 24 , .1q9
AUTHORIZATION TO CONSTRUCT
NPDES PERMIT
REPORT AND RECOMMENDATIONS
County: Catawba
MRO No. : 95-50
Permit No. NC0004987
PART I - GENERAL INFORMATION
1 . Facility and Address : Marshall Steam Station
% Duke Power Company
13339 Hagers Ferry Road
Huntersville, N . C . 28078
2 : Date of On-Site Investigation (if conducted) : N/A
2 Re r-rt Prepare Ey : Mi chael T . Parke'_" , Environ . Engr . II
4 , Persons Contacted Clnnt.qc.tPri Telephone Number : N/A
Verified Discharge Dnint (s ) , List for All Discharge Paints :
Latitude : 35° 36 ' 21" Longitude : 80 ° 57 ' 35"
Attach a USGS map extract and indicate treatment facility
• site and discharge point on map . Ensure discharge point(s)
correspond to NPDES permitted discharge points . ~N)
•," c
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 .
h . Dates) and construction activities allowed by previ ou
Airs issued in the previous two ( 2 ) years : Nin. - -

r
•
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 . Tyr a of pnc at c + nil i f �: T e a ica t rosea
s r..._ P r+t.._�.e d T r e rl._n ._ F a•_ _ ..� l'_•_ p p n p r c�•_• -
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 ermittec Duke Power Company (DPC) 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
pns.ihle fnr DPC to justify relocating the WWTP .
Pending a technical review and approval by P&E, it is
recommended that an ATC be issued.
Signature of Report Preparer Date
1770Z-07 -4c - 3 -2 4/1.95.---
Water Quality Region Supervisor Date
p:\nrisr\n;zr95\m,rshaUU,atc

.- ti
RATING SCALE FOR CLASSIFICATION OF WATER POLLUTION CONTROL SYSTEMS •
Name of Facility: btic, PO 111#942 CA-` /( SY- '49 P/#
Owner or Contact Person: TPA") C 1cete-
Mailing Address: ('3339 l 2078
County: C4 c- 6/9 Telephone: g2T:- f 96
Present Classification: New Facility Existing Facility
NPDES Per. No. NC0005f5157 Nondisc. Per. No.WQ Health Dept.Per No.
Rated by: /f'W'Nn&G /39/7,062 Telephone: 70X1- 63 -/699 Date: 91031(
Reviewed by: Health Dept. Telephone:
Regional Office Telephone:
Central Office Telephone:
ORC: Grade: Telephone:
Check Classification(s): Subsurf e Spray Irrigation Land Applic,tion
Wastewater Classification: (Circle One) /I J II III IV Total Points: l
tt
kJ-PLANT PROCESSES AND RELATED CONTROL EQUIPMENT WHICH ARE AN INTEGRAL PART OF INDUSTRIAL PRODUCTION SHALL NOT BE
CONSIDERED WASTE TREATMENT FOR THE PURPOSE OF CLASSIFICATION ALSO SEPTIC TANK SYSTEMS CONSISTING ONLY OF SEPTIC TAM(
AND GRAVITY NITRIFICATION LINES ARE EXEMPT FROM CLASSIFiCATiC*4
SLE SURFACE CLASSIFICATION SPRAY IRRKGATION OJ.SSIFICATION
(check all units that apply) (check all units that apply)
1. septic tanks 1, preliminary treatment (definition no. 32 )
2. pump tanks 2. lagoons
3. siphon or pump-dosing systems 3. septic tanks
4, sand titters 4. _pump tanks
5. grease trap/interceptor 5. pumps
6_011/water separators 6, sand filters
7, gravity subsurface treatment and disposal: 7, grease trap/interceptor
8. pressure subsurface treatment and disposal: 8. oil/water separators
9, disinfection
• 10. chemical addition for nutrient/algae control
11. spray irrigation of wastewater
In addition to the above clessiflcations, pretreatment of wastewater In excess of these components shell
be rated using the point rating system and will require an operator with an appropriate dual certification.
LAND APPLICATION/RESIDUALS CLASSIFICATION(Applies only to permit holder)
1. Land application d biosolids, residuals or contaminated soils on a designated site.
WASTEWATER TREATMENT FACIUTY CLASSIFICATION
The following systems shall be assigned a Class I classiiication,unless the flow is of a significant quantity or the technology is unusually
complex,to require consideration by the Commission on a case-by-case basis: (Check f!Appropriate)
1, Oil/water Separator Systems consisting only of physical separation,pumps and disposal;
2. Septic Tank/Sand Fitter Systems consisting only of septic tanks, dosing apparatus, pumps,sand lifters, disinfection
and direct discharge;
3. Lagoon Systems consisting only of preliminary treatment, lagoons,pumps,disinfection, necessary chemical treatment for
algae or nutrierd control,and direct discharge;
4. - Closed-loop Recycle Systems;
5, ,Groundwater Remediation Systems consisting only of of/water separators, pumps, air-stripping, carbon adsorption, disinfection
and disposal;
6. Aquaculture operations with discharge to surface waters;
7. Water Plant sludge handling and back-wash water treatment:
8. Seafood processing consisting of screening and disposal.
9, Single-family discharging systems,with the exception of Aerobic Treatment Units, will be classified if permitted after July 1,
1993 or N upon inspecion by the Division,It is found that the system is not being adequately operated or maintained. Such
systems will be notified of the classification or reclassification by the Commission, in writing.