NC0004979_Engineer's Certification_20050817

Raleigh, NC 27699-1617 .
RE: Engineer's Certification
Allen Ash Pond — NPDES No. NC0004979
Allen Steam Station
Belmont, North Carolina
Shield Project No. 1030040-02
As of the date of this letter, Duke Power has substantially completed construction on the
Chemical Injection Facility (CIF) for the Allen Ash Basin. As outlined in the
Authorization to Construct*(ATC) Number 004979AO1 the work consists of:
• Construction of three primary settling cells
• Construction of treatment channel .
• Construction of chemical injection system
• Construction of final settling/flocculation cell
At this time the project has been completed in such a manner as to allow operation of the
CIF as intended. Construction on several features of the ash pond continues.
Specifically, two of the three planned primary settling cells have been completed. This
arrangement will allow several years of ash settling capacity while the third cell is .
coinpleted. Also the main pond area will be used for final settling/flocculation until
construction is completed on the final settling/flocculation cell. The ongoing activities do
not prevent the CIF from operating as designed.
Attached is the Engineer's Certification for the construction of the Chemical Injection
Facility located at the above site. Construction of this facility was in general accordance
with the plans and specifications and the Authorization to Construct issued Tune 21,
2004.
Sincerely
SHIE D ENGINE RING, INC.
_
o ert L. i zin Keith A. An on
Director of Wastewater Services Principal En me
5 � _ 1I260
Attachment=�G1F1�°c ,�''O
HAProjects\2003\1030040-02 Duke - Allen\Engineer's Certification. doc , � i„ie1f4041 5
4301 Taggart Creek Road
Charlotte, NC 28208
www.shieldengineering.com
n
Telephone [phone]
Fax [phone]

Allen Steam Station
• Permit No. NCO004979
Page 4
Engineer's Certification
I, I<Ei rA A , A w'TW s,rj Y , 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, A L L F- i✓ s- -/-&A m 5 —,A 7-i 0 �✓, A Eb m a N 7- 1✓C for
the
Project Name Location
Permittee hereby states that, to the best of my abilities, due care and diligence was.used in the
following:
• Construction of three primary settling cells
• Construction of treatment channel
• Construction of chemical injection system
• Construction of final settling/flocculation cell
Once. construction under this ATC has been completed and an Engineer's:Certificate has
been submitted, the permittee is authorized to operate the units listed above, with permitted limits
as specified in the NPDES permit issued May 17, 2002. The Division of Water Quality approves
this project in terms of compliance with NPDES limits; we defer to Duke Energy and their
consultants for approval of distribution system, adequate mechanical design, structural integrity,
etc. of the.entire physical chemical treatment system.
1
Signature Registration No. 1 Z 60
Date " I % -
00
Mail this Certification to the NPDES Unit
D4�4F�ssto�{9y
ENR/DWQ
1617 Mail Service Center 11260 i
Raleigh, NC 27699-1617 ' r �a�t
.,.'Q• A..�•``,.
4

,
June 21, 2004
Mr. Michael A. Ruhe, Manager
Environmental Support
Duke Power
526 South Church Street
Charlotte, NC 28202-1802
Michael F. Easley, Governor
State of North Carolina
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
Subject: Authorization to Construct Permit Issuance
ATC Number 004979A01
Allen Steam Station
NPDES Permit NC0004979
Gaston County
Dear Mr. Ruhe:
A request for an Authorization to Construct (ATC) was received by the Division and final
plans and specifications for this project have been reviewed and found to be satisfactory.
Authorization is hereby granted for construction of a physical chemical treatment system at Allen
Steam Station. Specifically, this ATC allows:
• Construction of three primary settling cells
• Construction of treatment channel
• Construction of chemical injection system
• Construction of final settling/flocculation cell
Once construction under this ATC has been completed and an Engineer's Certificate has
been submitted, the permittee is authorized to operate the units listed above, with permitted limits
as specified in the NPDES permit issued May 17, 2002. The Division of Water Quality approves
this project in terms of compliance with NPDES limits; we defer to Duke Energy and their
consultants for approval of distribution system, adequate mechanical design, structural integrity,
etc. of the entire physical chemical treatment system.
This Authorization to Construct is issued in accordance with NPDES Permit No.
NC0004979 issued May 17, 2002, and shall be subject to revocation unless the treatment system is
constructed in accordance with the conditions and limitations specified in the permit.
The sludge generated from these treatment facilities must be disposed of in accordancewith
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 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
YVOLUI Yuamy [phone]
1617 Mail Service Center

Allen Steam Station
Permit No. NC0004979
Page 2
least forty-eight (48) hours in advance of operation of the installed facilities so that an in-place
inspection can be 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 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. Once the
facility is classified, the Permittee must submit a letter to the Certification Commission which
designates the operator in responsible charge within: (A) Sixty calendar days prior to wastewater
being introduced into a new system or (B) within 120 calendar days of the following, (i) after
receiving notification of a change in the classification of the system requiring the designation of a
new ORC and back-up ORC or (ii) a vacancy in the position of ORC or back-up ORC.
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: 4-4-3-2+5.6-foriel-ation--ef or-€ailure--to-aet-iii-aeeordance with--the-terms-and-conditions-of
this Permit.
Failure to abide by the requirements contained in this Authorization to Construct 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.
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 NPDES Unit, Division of Water
Quality, 1617 Mail Service Center, Raleigh, NC 27699-1617.

Allen Steam Station
Permit No. NC0004979
Page 3
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. Sergei Chernikov, Ph.D., telephone
number [phone], extension 594.
Sincerely,
Alan W. Klimek, P.E.
cc: Central Files
_NPDES_Unit,-Permit File
Mooresville Regional Office, Water Quality

Duke
Power®
A Duke Energy Company.
March 24, 2004
Mr. David Goodrich
NPDES Unit Supervisor
Division of Water Quality
North Carolina Department of
Natural Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Allen Steam Station
NPDES Permit NC0004979
Request for Authorization to Construct
Dear Mr. Goodrich:
DUKE POWER
526 South Church Street
Charlotte, NC 28202-1802
toT 9 Z HVW
f
Duke Power appreciates your cooperation and approval to extend a pilot test for selenium
reduction through April 2004 while the necessary plans and specifications needed to request an
Authorization to Construct (ATC) a modification of the permitted treatment system could be
prepared and submitted for approval. Attached are three copies of the proposed plans for
addition of a chemical injection system based on our on-going pilot test.. Operation of the pilot
treatment system continues to confirm that the addition of ferric sulfate to maintain compliance
with the NPDES permit selenium limit is an effective control method. Upon your review and
approval of the requested ATC, Duke anticipates that construction and initial operation of the
chemical injection system will take approximately six months. Thus, Duke Power requests
permission to continue to use the current addition system until modifications can be implemented
per approved ATC plans by your NPDES Permitting Unit. The pilot treatment system is
currently approved to add up to 100 gallons of ferric sulfate per 5.0 MGD of wastewater.
If you need to discuss further information, please contact Ron Lewis [phone] or me (980)
373-3231.
Sincerely,
Michael A. Ruhe, Manager
Enviromnental Support
Attachment
www.dukepower.com

ATC SUMMARY
SCOPE
Allen Steam Station
ATC No. 004979A01
Catawba River, WS -IV
Catawba River Basin
Gaston County
The scope of the project includes construction of the physical chemical treatment system. This system will
treat 18-24 MGD sluice water to reduce the TSS and Se to below the NPDES compliance limits by physical
and chemical treatment processes. Raw primary ash sluice will be settled in settling/sedimentation basins or
cells then conveyed past the chemical injection system form treatment. After chemical injection, the
secondary sluice flows to a secondary settling basin and then it is discharged to the main pond.
REVIEW SUMMARY
Executive Summary
The Allen Steam Station (Duke Energy) is a coal fired steam electric plant in Gaston County. The facility has
been experiencing problems meeting pH and Se limits specified in the NPDES permit. Proposed project
should address existing issues.
Applicant:
Mr. Michael A. Ruhe, Manager
Environmental Support
Duke Power
526 South Church Street
Charlotte, NC 28202-1802
Application/Plans Prepared by:
Shield Engineering, Inc.
4301 Taggart Creek Road
Charlotte, NC 27560
Significant Dates:
Received: 03/26/04
Acknowledged: 04/16/04
RO comments: 05/10/04
Reviewed: 05/21/04
Project Location:
Gaston County
Facility status: Existing
Wastewater source: Coal fired steam electric plant.
Funding Source: private
Estimated Project Schedule:
To start construct immediately upon receiving the ATC
Page 1

Submissions:
• Letter of Transmittal
• Engineering Plans / Specs
• Description of the Treatment System
Regional Office comments:
Pending a final technical review and approval by the NPDES Unit, it is recommended that an ATC be issued
as requested.
Review Notes:
The project has been reviewed at the ATC review in early June 2004, no significant deficiencies were found.
Duke Power proposes to use ferric sulfate to reduce concentration of selenium in wastewater. The co-
precipitation of Se with iron oxides/hydroxides is most efficient under pH 3.5-5.5 and sulfuric acid will be
used to control pH during treatment. Pilot studies conducted on site demonstrated that concentration of Se in
wastewater can be reduced to 3 ug/L, which is significantly below current permit level of 31 ug/L.
Specifications:
Flow
Primary Settling
Influent Suspended Solids
pH range
Selenium level
Final settling
Ferric sulfate tanks
Sulfuric acid tank
18-24 MGD
1 — 2 hour minimum
5,000-10,000 mg/L
7-10
31 µg/L or higher
1 hour minimum
2 x 8,000 gallons
8,000 gallons
Page 2

To: Permits and Engineering Unit
Water Quality Section
Attention: Mark McIntire
SOC PRIORITY PROJECT: No
Date: May 5, 2004
AUTHORIZATION TO CONSTRUCT
NPDES PERMIT
County: Gaston
MRO No.: 04-34
Permit No. NC0004979
PART I - GENERAL INFORMATION
1. Facility and address: Allen Steam Station
% Duke Energy, Inc.
EC11E
526 South Church Street
Charlotte, NC 28202-1802
r
M AY 1 0 2004 -�
i
� � 1
:�? S ;0 E
2. Date of on-site investigation (if conducted): No site visit was conducted.
3. Report prepared by: Michael L. Parker, Environmental Engineer II
4. Persons contacted and telephone number: Ron Lewis, [phone]
5. Verified discharge point(s), list for all discharge points:
outfall 001 outfall 002 outfall 003 outfall 004
Latitude: 350 11' 23" 350 10' 30" 350 11' 24" 350 11' 15"
Longitude: 81 ° 00' 45" 81 ° 00' 23" 81 ° 00' 46" 81 ° 00'22"
Attach a USGS map extract and indicate treatment facility site and discharge point on
map.
USGS Quad No.: G 14 NE
6. Site size and expansion area consistent with application? Yes. There is sufficient area
available for the construction of the proposed WWT facilities.
7. Topography (relationship to flood plain included): The site is not located within the 100 -
year flood plain of the receiving waters.
8. Location of nearest dwelling: None within 1000± feet of the site.

Page Two
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Existing treatment facility
a. Current permitted capacity: Flows are intermittent in nature.
b. Date(s) and construction activities allowed by previous ATCs issued in the
previous two years: No ATCs issued to this facility within the past two years.
C. Actual treatment capacity of the current facility (design volume in MGD):
Outfall 001 Outfall 002 Outfall 003 Outfall 004
784.8 11.6 6.3 8.0
d. Description of existing or substantially constructed WWT facilities: outfall 001 -
there are no existing WWT facilities; outfall 002 - permittee operates a septic
tank/sand filter WWT treatment system for treatment of all domestic wastewater.
The effluent from the septic tank/sand filter then enters an earthen (ash) settling
basin with pH adjustment prior to discharge; outfall 003 - There are no existing
WWT facilities; outfall 004 - There are no existing WWT facilities. The permittee
also operates a raw water treatment system involving sedimentation, filter back
wash, and demineralization. Discharges from the various raw water treatment
processes (as well as any residuals generated) are sent to the ash basin. The raw
water is not used for drinking, but rather in -plant process use.
2. Type of proposed treatment facility: The applicant proposes to construct a chemical
injection system for treatment of pollutants that will not settle out in the existing ash
basin settling cells. This system will involve the division of a portion of the existing fly
ash basin into a series of three (3) primary settling cells. During any given period of time,
each cell will be alternated during plant operation with one receiving the primary sluice
wastewater flow while the other two operate in a drying or excavation mode (ash
removal). From the primary settling cells, the wastewater will flow through what is being
referred to as a "treatment channel" where any chemical injection that may be necessary
will occur. In this channel, a portion of the flow will be analyzed for pH, and if
necessary, ferric sulfate and/or sulfuric acid will be added as needed for pH control and to
augment precipitation of other constituents of concern (primarily selenium). From the
treatment channel, the wastewater will flow into a final settling or flocculation cell. This
cell will help capture any solids that may not be removed in either the primary cells or the
treatment channel. Overflow from this cell will then flow across a vegetated ash delta
prior to discharge to the main ash pond. Duke also plans to install the capability of
bypassing the main ash pond should effluent quality not require the additional polishing
that the main ash basin would provide or should conditions in the main ash pond be
detrimental to effluent quality (such as an algae bloom).

Page Three
3. Residuals handling and utilization/disposal scheme: Ash is removed as needed from the
ash basin, stockpiled for drying, and then reused in accordance with the terms and
conditions of Duke Power's Ash Reuse permit.
4. Treatment plant classification: Class I
5. SIC Code(s): 4911 Wastewater code(s): 68, 66 Main Treatment Unit code: 50002
6. Important SOC/JOC or compliance schedule dates: This facility is neither under an
SOC nor is one being considered at this time.
PART III - EVALUATION AND RECOMMENDATIONS
The applicant, Duke Energy, Inc. (Duke), has requested the issuance of an ATC for the
construction and modification of the existing ash treatment and disposal system at Duke's Allen
Steam Station. These modifications are necessary in order for Duke to maintain compliance with
the company's NPDES permit. Specifically, Duke has experienced difficulty in complying with
pH and selenium limitations.
In July 2003, Duke was granted approval to conduct a pilot study where flow
modifications to the existing ash basin allowed Duke to maintain compliance with the permit
limitation for selenium while allowing Duke staff to collect operational data that will help them
implement a permanent solution. In October 2003, Duke requested an extension of the pilot
study in order to finalize the data they had acculmulated, and begin the process of designing a
permanent solution. This Office granted an extension of the pilot study for an additional six (6)
months ending April 30, 2004. Since the actual request for the ATC was not received by the
Division until March 26, 2004, Duke requested and received (by email) an extension of the pilot
study until such time as the Division issues.the ATC.
Pending a final technical review and approval by the NPDES Unit, it is recommended
that an ATC be issued as requested.
. Signature of Report Preparer
s/�
Water Quality Reginal Supervisor Date
hAatc\atc04\a11en.atc

Duke Power Company
Electric System Support
13339 Hagers Ferry Road
Huntelsoille, NC28078-7929
DUKE POWER
July 22, 1996
A. Preston Howard, Jr., P.E.
North Carolina Department of Environment, Health
and Natural Resources
Division of Environmental Management
Permits and Engineering Unit
P.O. Box 29355
Raleigh, North Carolina 27626-0535
Subject: Duke Power Company- Allen Steam Station
Wastewater Treatment Facility Certification
Authorization to Construct
NPDES Permit No. NC0004979
File No: ENV -0309
Dear Mr. Howard:
In accordance with the requirements outlined in your March 20, 1995 letter to Ms.
Jennifer Rudisill of Duke Power Company, attached is the Engineering Certification for
installation of the oil/water separator system at the subject facility. A Model DP -4
separator (by the same manufacturer) was used in lieu of the Model DP -8. This
modification was made to more economically treat the actual system flow rate conditions.
The Mooresville Regional Office will be notified at least 48 hours in advance of system
operation as required.
If you have any questions or require additional information, please contact me at (704)
875-5934.
Sincerely,
Christopher D. Hallman, Senior Engineer
Environmental Division
Attachment
CC' D.E.M. Sullivan
Pnw i (it: n:o/ded lxw)er
D.L. Scruggsyu4lewsk-i,�,,.

Permit No. NC0004979
Authorization to Construct
Duke Power - Allen Steam Station
March 20, 1995
Page 3
Enf4ineer's Certification
I, as I du&er�iodicry
Professional Engineer in the State of North
Carolina, havi g been authorized to obse�eweekly, full time) the construction of the
ro'ect, / n. 5-&. ��.� Grou u, er B o
t J� � �e,-t;.,. c� m ►,� , /J . L • for the
Project Name Location r
Permittee hereby state that, to the best o my abilities, due care and diligence was used in the observation
of the construction such that the construction tion was observed to be built within substantial compliance and
intent of the approved plans and specifications.
Signature �fi� aU • ��... Registration No. 125 8 4 .
Date
�CARO °'•.
0•,OFEs5rp�q :9 ••�.
t` SEAS
Z
S 12584 Q
Z..
°•.�.PH E R D�•��.•o
a......

'o. NCO0044979
tion: -to Construct
7ower - Allen Steam Station
20, 1995
duly
Carolina, hav' g been authorized o observe eriodicall�weeklysfull time) the construction of iheNorth
project,
Project Name
—Be' m 0^+— C- . for the
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 wit
intent of the approved plans and specifications. hin substantial compliance and
Signature Registration No. /25 8
Date �/ 9 6
CAS
�O:.oFEss���..: •.
:Q SEAL
Z
12,984 Q
.
pNER D
The Division of Water Quality hereby
acknowledges receipt and acceptancc of this Engineers
Certification
Ql
N5

:°:� "'
x

10/26/01 15:29 V704 382 6240 DPCO ENV ENGR Z004
Author: "Parker, Michael" <[e-mail]> at INTERNET
Date: 4/29/96 2:23 PM
Priority: Normal
TO: Michael E Kowalewski at DPCGSD01
subject: RE:Certificate of Completion Permit No 0004979AC
------------------------------------ Message Contents ------------------------------------
Date: Mon, 29 Apr 96 13:36:06 EST
From: "Michael E Kowalewski".<mekowale@dpcmail_dukepower_com>
To: tsl9w48®mro.ehnr.state.nc.us.
Subject: RE:Certificate of Completion Permit No 0004979AC
Mike,
Received a letter from Raleigh inquiring about permit no 0004979AC and
why no certification has been received. The project is still under
construction and is currently scheduled for completion by the end of
June 1996. The letter directs us to contact the Mooresville Office if
the facility has not been completed and provide an expected completion
date. Are you the right person for this? Do you need any further
information? Please acknowledge receipt.
Mike Kowalewski(MEKOWALEQDPCMAIL.DUKEPOWER.COM)
Mike: Response received. I'll make a copy of this for the file. No
further action necessary. Thanks.
M. Parker - MRO

State of North Carolina
Department of Environment,
Health and Natural Resources 4 • 0
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary E H N
A. Preston Howard, Jr., P.E., Director
March 20, 1995
Ms. Jennifer A. Rudisill
Duke Power Company
Generation Services Dept.
13339 Hagers Ferry Road
Huntersville, NC 28078-7929
Subject: Permit No. NC0004979
Authorization to Construct
Allen Steam Station
Groundwater Remediation
Gaston County
Dear Ms. Rudisill:
A letter of request for an Authorization to Construct was received on November 30, 1994 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 construction of #DP -8 oil -water separator with
discharge of treated wastewater into the Catawba and South Fork Catawba Rivers.
This Authorization to Construct is issued in accordance with Part III, Paragraph A of NPDES
Permit No. NC0004979 issued March 9, 1995 and shall be subject to revocation unless the wastewater
treatment facilities are constructed in accordance with the conditions and limitations specified. in Permit No.
NC0004979.
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 [phone] 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
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.
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

Permit No. NC0004979
Authorization to Construct
Duke Power - Allen Steam Station
March 20, 1995
Page 2
A copy of the approved plans and
life of the facility.
shall be maintained on file by the Permittee for the
Failure to abide by the requireme' is contained in this Authorization to Construct may subject the
Permittee to an enforcement action by t e Division of Environmental Management in accordance with
North Carolina General Statute 143-215. A to 143-215.6C.
The issuance of this Authorizatioo to Construct does not preclude the Permittee from complying
with any and all statutes, rules, regulatio s, or ordinances which may be imposed by other government
agencies (local, state, and federal) which 4ave jurisdiction.
One (1) set of approved plans
questions or need additional information,
5083, extension 537.
d specifications is being forwarded to you. If you have any
please contact Jeanette Powell at telephone number (919) 733 -
Sincerely,
reston i�wwr , Jr., P.E.
cc: Gaston County Health Department
Mooresville Regional Office, Water Quality
Training and Certification Unit
Facilities Assessment Unit

DIVISION OF ENVIRObD=AL MANAGEMENT March 27, 1981
Mr. S. B. Hager, Chief 14ineer
Dine Power Company
P. 0. Box 33189
Charlotte, North Carolina 28242
SUB=Ts Permit No. MC0004979
Authorization to Construct
Duke Power Company
Ash Settling Basin - Stage IV
Gaston County
Dear Mr. Eagers
c 17,,
The final plans sud specifications for the subject project have been reviewed
and found to be satisfactory. Authorization is hereby granted for the construction
of Stage W ash settling and storage facilities consisting of increasing the total
area from 111 acres to 180 acres by raising the dam height to serve Duke Power
Company's Allen Steam Station,
This Authorization to Construct shall be subject to revocation unless the
wastewater treatment facilities are constructed in accordance with the conditions
and limitations specified in Permit leo. NC0004979.
One (1) set of approved plans is being forwarded to you.
Sincerely yours,
SiZ,7-2d by
L.. F'.
�art P. Helms
ing Director
eel Gaston County Aealth Department
Mr. Richard Peace/
Mr. R. S. Taylor/
Mooresville Regional Office Manager

10/26/01 15:28
• fl
' 704 382 6240 DPCO ENV ENGR
Ms. Coleen Sullins
Permits and Engineering Unit -• ---� - ----
North Carolina Department oof Environment,
Health and Natural Resources
P.O. Box 29535 -
Raleigh, NC 27626-0535
Subject: Authorization to Construct .
Allen Steam Station
NPDES #NC0004979
File: AS -704.15
Dear Ms. Sullins:
Duke Power Company requests an authorization to construct for installation of an
oil -water separator at Allen Steam Station in Gaston County. Included with this
request are five (5) copies of the plans and the required fee of $200.00. The oil -
water separator would be used as part of a current groundwater remediation
program as outlined in a letter sent September 29, 1993.
In a letter from your office dated June 21, 1994, we were informed that this
discharge would have to be included in the NPDES permit prior to our receiving
the ATC. The draft of the NPDES permit we received on October 31 of this year
identifies the effluent from the oil -water separator as a source to the basin 'and .
includes monitoring requirements for benzene, toluene and MTBE. As we
understand from conversations with. -Mr. Sean Gods of your office, we may apply
for the ATC concurrent with the NPDES permit renewal process..
As outlined in the September correspondence, we are currently removing free
product (#2 fuel oil) from the contaminated site at Plant Allen and disposing of it
with other used oil, collected on-site according to the. appropriate regulations. We
would like to install an oil -water separator, the Hydro -Flo Technologies DP -8, that
would separate the free product and the groundwater at a maximum rate of 20
gpm. Please see the.attached drawings for specifics. The groundwater would then
be routed to the ash basin via a sump system. Please note that these plans are
PMtedon tecrJedpaW
0002
Dake Poorer Company
Generation Services Department
13339 Hagers Any Road
Hrmtersville, NC 28078-7929
DUKEPOWER;`�Is:�+:`fir.},.•;ITFII�C
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November 28, 1994.w
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Ms. Coleen Sullins
Permits and Engineering Unit -• ---� - ----
North Carolina Department oof Environment,
Health and Natural Resources
P.O. Box 29535 -
Raleigh, NC 27626-0535
Subject: Authorization to Construct .
Allen Steam Station
NPDES #NC0004979
File: AS -704.15
Dear Ms. Sullins:
Duke Power Company requests an authorization to construct for installation of an
oil -water separator at Allen Steam Station in Gaston County. Included with this
request are five (5) copies of the plans and the required fee of $200.00. The oil -
water separator would be used as part of a current groundwater remediation
program as outlined in a letter sent September 29, 1993.
In a letter from your office dated June 21, 1994, we were informed that this
discharge would have to be included in the NPDES permit prior to our receiving
the ATC. The draft of the NPDES permit we received on October 31 of this year
identifies the effluent from the oil -water separator as a source to the basin 'and .
includes monitoring requirements for benzene, toluene and MTBE. As we
understand from conversations with. -Mr. Sean Gods of your office, we may apply
for the ATC concurrent with the NPDES permit renewal process..
As outlined in the September correspondence, we are currently removing free
product (#2 fuel oil) from the contaminated site at Plant Allen and disposing of it
with other used oil, collected on-site according to the. appropriate regulations. We
would like to install an oil -water separator, the Hydro -Flo Technologies DP -8, that
would separate the free product and the groundwater at a maximum rate of 20
gpm. Please see the.attached drawings for specifics. The groundwater would then
be routed to the ash basin via a sump system. Please note that these plans are
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identical to those in the previous request dated December 20, 1993, with one
small change; we would like.to.use model # DP -8 as opposed to model # DP -4 oil -
water separator.
The unit would be installed and the effluent routed to the ash basin after receiving
both approval from you to construct the system and the new NPDES -permit. -'Duke
Power is currently operating a similar unit at Lee Steam Station in South Carolina .
with good results.
We are currently under time constraints with the groundwater section of
NCDEHNR. As such we would appreciate an expeditious response to this
request. If you have any questions about the installation of the oil -water separator,
please do not hesitate to contact me at [phone] or the above address. We
thank you for your assistance in resolving this issue.
Sincerely:
Jennifer A. Rudisill
Assistant Scientist
Water Protection, Environmental Division
Attachments
cc: Mr. Mike Parker - NCDEHNR, Mooresville Regional Office

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