NC0086665_Permit Issuance_20040510

cFWATF'TO
NCDENR
Jim Doubek, Plant Manager
Rockingham Power LLC
240 Ernest Drive
Reidsville, North Carolina 27320
Dear Mr. Doubek:
Michael F. Easley
Govemor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
May 10, 2004
NPDES Permit Issuance
Permit No. NC0086665
Dynegy/Rockingham Power
Combustion Turbine Facility
Rockingham County
Division staff have reviewed and approved your renewal application for an NPDES discharge
permit. Accordingly, the Division is forwarding the subject NPDES permit. This permit is
issued pursuant to the requirements of North Carolina General Statute 143-215.1 and the
Memorandum of Agreement between North Carolina and the U.S. Environmental Protection
Agency dated May 9, 1994 (or as subsequently amended).
Based on comments received from the permittee on the Draft permit, the following changes
have been incorporated into this Final permit:
• Retain the effluent sampling location designated in the previous permit.
• Change the semi-annual monitoring for EPA 624/625 parameters to semi-annual
monitoring for BTEX only (benzene, toluene, ethylbenzene, xylene). This is based on the
fact that there were no detections for Method 625 parameters between 2000-2004,
while there were some detections for toluene and xylene. The BTEX effluent data will be
reviewed during the next permit renewal in 2007 to determine the need for permit
limits. Please note that the state water quality standard for toluene is 11 ug/1 based on
chronic aquatic life impacts, and this water quality standard is applicable to the
receiving stream (i.e., unnamed tributary to Jacobs Creek, a Class C waterbody).
In addition, the following items from the DRAFT permit have been retained in this FINAL
permit:
• Change acute toxicity monitoring requirement from episodic to annual, based on the
satisfactory performance of past tests.
• Addition of monthly effluent monitoring for total lead, based on a lead detection of 29
ug/1 in a contact stormwater sample collected 8/7/2001. The chronic instream water
quality standard for total lead is 25 ug/1. This additional data will be evaluated during
the next permit renewal to determine whether an effluent limit is necessary.
• Change the permit expiration date to 4/30/2007.
If any parts, measurement frequencies, or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within
thirty (30) days following receipt of this letter. This request must be in the form of a written
petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the
N. C. Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
Internet: h2o.enr.state.nc.us
Phone: [phone]
fax: [phone]
DENR Customer Service Center: 1 800 623-7748

NPDES Permit Issuance
Permit No. NC0086665
Dynegy/Rockingham Power LLC
Combustion Turbine Facility
Page 2
office of Administrative Hearings, 6714 Mail Service Center, Raleigh, North Carolina 27699-
6714. Unless such a demand is made, this permit shall be final and binding.
Please take notice that this permit is not transferable except after notice to the Division. The
Division may require modification or revocation and reissuance of the permit. This permit does
not affect the legal requirements to obtain other permits which may be required by the Division
of Water Quality, the Division of Land Resources, the Coastal Area Management Act, or any
other federal or local governmental permit.
If you have any questions concerning this permit, please contact Tom Belnick at telephone
number [phone], ext. 543.
SincerelyOriginal
Signed BY
Al 'rTT'WKliimmek, P E.
Enclosure: NPDES Permit No. NC0086665
cc: Winston-Salem Regional Office, Attn: David Russell
Aquatic Toxicology Unit
Central Files
NPDES File
•

Permit No. NC0086665
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful
standards and regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended,
Dynegy, Inc.
is hereby authorized to discharge wastewater from a facility located at
Rockingham Power LLC
Combustion Turbine Facility
240 Ernest Drive
Reidsville, North Carolina
Rockingham County
to receiving waters designated as an unnamed tributary to Jacobs Creek in the Roanoke River
Basin in accordance with effluent limitations, monitoring requirements, and other conditions
set forth in Parts I, II, III, and IV hereof.
The permit shall become effective June 1, 2004
This permit and the authorization to discharge shall expire at midnight on April 30, 2007
Signed this day May 10, 2004
Original Signed
D+ A. Goodrich
Alan W. Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

Latitude:
Longitude:
Quad #:
Stream Class:
Receiving Stream:
Permitted Flow:
SCALE 1:24000
36°19'42" Sub -Basin.
79°49'45"
B19SE
C
Unnamed Tributary to Jacob's Creek
Not Limited
03-02-03
i
Dynegy, Incorporated
NC0086665

Permit No. NC0086665
A (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Beginning on the effective date of this permit and lasting until expiration, the Permittee is authorized to discharge
evaporative cooling water and contact stormwater from Outfall 001. Such discharges shall be
limited and monitored by the Permittee as specified below:
EFFLUENT
CHARACTERISTICS
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
Monthly Average
Daily Maximum
Measurement
Frequency
Sample
Type
Sample
Location'
Flow (MGD)
Monthly
Note 2
E
Total Suspended Solids
45.0 mg/1
Monthly
Grab
E
Total Residual Chlorine
17 ug/1
Monthly
Grab
E
Turbidity
Monthly
Grab
E
Temperature3
Monthly
Grab
E
pH4
Monthly
Grab
E
5 'It, �'P
Monthly
Grab
E
Monthly
Grab
E
Total Lea D Z r
/1/4.1`157 pri1�-G
BTEX6
Semi -Annual
Grab
E
Acute Toxicity?
Annual
Grab
E
Notes:
1. Sample locations: E- Effluent, defined as a point after combination of the evaporative cooling water and the
contact stormwater, and prior to discharge to the unnamed tributary to Jacob's Creek.
2. Effluent flow may be monitored by one of the following methods: 1) measure flow continuously; 2) calculate flow
based on the area draining to the outfall, the built -upon area, and the total rainfall; 3) estimated by flow
measurement at 20 minute intervals during the entire discharge event; or 4) based on pump logs. Where no
measurable discharge occurs, "no discharge shall be reported on the monthly discharge monitoring report
submission.
3. The effluent temperature shall not cause the temperature of the receiving stream to increase by more than 2.8
degrees C above natural water temperature, and in no case cause the temperature of the receiving stream to
exceed 32 degrees C.
4. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
5. Where possible, the grab sample for oil and grease shall be skimmed from the surface of a quiescent zone.
6. BTEX= benzene. toluene, ethylbenzene, and xylene.
7. Acute Toxicity (Fathead Minnow, 24-hour); refer to Special Condition A (2).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
No direct discharge of fuel tank solids, tank bottom water, or the rag layer is permitted.

Permit No. NC0086665 .
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
A (2). ACUTE TOXICITY MONITORING (ANNUAL)
The permittee shall conduct annual toxicity tests using protocols defined as definitive
in E.P.A. Document EPA/600/4-90/027 entitled "Methods for Measuring the Acute
Toxicity of Effluents to Freshwater and Marine Organisms." The monitoring shall be
performed as a Fathead Minnow (Pimephnles promelas) 24 hour static test. Effluent
samples for self -monitoring purposes must be obtained below all waste treatment. The
permittee will conduct one test annually, with the annual period beginning in
January of the calendar year of the effective date of the permit. The annual test
requirement must be performed and reported by June 30. If no discharge occurs by
June 30, notification will be made to the Division by this date. Toxicity testing will be
performed on the next discharge event for the annual test requirement.
The parameter code for this test is TAE6C. All toxicity testing results required as part
of this permit condition will be entered on the Effluent Discharge Form (MR-1) for the
month in which it was performed, using the appropriate parameter code. Additionally,
DWQ Form AT-1 (original) is to be sent to the following address:
Attention:Environmental Sciences Branch
North Carolina Division of
Water Quality "
4401 Reedy Creek Rd.
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 test data from either these monitoring requirements or tests performed by
the North Carolina Division of Water Quality 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, such as
minimum control organism survival and appropriate environmental controls, shall
constitute an invalid test and will require immediate follow-up testing to be completed
no later than the last day of the month following the month of the initial monitoring.

ArH_r Fyn
«etbtii{tc Euiteth
1921 VANCE STREET P.O. BOX 2157 REIDSVILLE, NC 27320 336-349-4331
PUBLIC NOTICE
STATE OF NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION-
/NPDES UNIT
1617 MAIL SERVICE CENTER
RALEIGH, NC 27699-1617
NOTIFICATION OF INTENT TO ISSUE A NPDES
WASTEWATER PERMIT
On the basis of thorough staff review and ap-
Plication of NC General Statute 143.21. Public
aw 92-500 and other lawful standards and regu-
lations, the North Carolina Environmental man-
agement Commission proposes to issue a Na-
tional Discharge Elimination System (NPDES)
wastewater discharge permit to the person(s)
- listed below effective 45 days from the publish
date of this notice.
Rockingham Power LLC located at 240 Emest
Drive, Reidsville, NC in Rockingham County, has
applied for renewal of its NPDES permit
NC0086665, which discharges to an unnamed
tributary to Jacobs Creek in the Roanoke River
Basin. Total residual chlorine is water quality
limited.
Written comments regarding the proposed
permit will be accepted until 30 days after the
publish date of this notice. All comments re-
ceive prior to that date are considered in the fi-
nal determinations regarding the proposed per-
mit. The Director of the NC Division of Water
Quality may decide to hold a public meeting for
the proposed permit should the Division receive
a significant degree of public interest.
Copies of the draft permit and other support-
ing information on file used to determine condi-
tions present in the draft permit are available
upon request and payment of the costs of repro-
duction. Mail comments and/or requests for in-
formation to the NC Division of Water Quality at
the above address or call Ms. Valery Stephens
at [phone], extension 520. Please include
the NPDES permit number (attached) in any
communication. Interested persons may also
visit the Division of Water Quality at 512 N. Salis-
bury Street, Raleigh, NC 27604-1148 between
the hours of 8:00 a.m. and 5:00 p.m. to review in-
formation on file.
. March 21, 2004
AFFIDAVIT OF PUBLICATION
NORTH CAROLINA
ROCKINGHAM COUNTY
Before the undersigned, a Notary Public of Said
County and State, duly commissioned, qualified, and
authorized by law to administer oaths, personally appeared
Judy Sizemore, who being first duly sworn, deposes and says.
That she is an official of Media General Inc, of Reidsville
engaged in the publication of a newspaper known as The
Reidsville Review, published, issued, and entered as second
class mail in the City of Reidsville, in said County and State;
that she is authorized to make this affidavit and sworn
statement, that the notice or other legal advertisement, a true
copy of which is attached hereto, was published in The
Reidsville Review on the following dates:
and that the said newspaper in which such notice, paper
document, or legal advertisement was published, at the time
of each and every such publication, a newspaper meeting all of
the requirements and qualifications of Section 1-597 of the
General Statutes of North Carolina and was a qualified
newspaper within the meaning of Section I-597 of the
General Statutes of North Carolina.
This
Ld
day of ;h]� J Q 3
Sworn to a subscribed before me, this
day of
Ll
cgtO(',
,„,,y Notary Public
dzp,
a of
My commission expires the J
, y G7r

CO M 61111 'i5
ROCKINGHAM POWER, LLC
240 Ernest Drive
Reidsville, NC 27230
[phone]
April 13, 2004
Mr. Tom Belnick
North Carolina Division of Water Quality
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: Rockingham Power, LLC
NPDES Draft Permit No. 0086665
Dear Mr. Tom Belnick:
1
APR 1 5 2004
On March 17, 2004, NCDENR issued Rockingham Power, LLC's (Rockingham) draft
NPDES renewal permit. This letter provides Rockingham's comments on the draft
permit as follows:
• Rockingham requested in the October 16, 2001 renewal application to
change the effluent sample location to be after the evaporative cooling water
and contact stormwater are combined, but prior to the addition of noncontact
stormwater runoff and prior to discharge to the receiving stream. After
discussions with Mr. David Russell, Environmental Specialist with NCDENR,
Rockingham would like to rescind this request and maintain the current
sampling location; at the outfall drainage location on the southeast corner of
the facility. This current sampling location includes evaporative cooling water,
oil/water separator discharge water and noncontact stormwater. Mr. Russell
concurs with this decision.
• Special Condition Section A(1). Note 6. of the above reference NPDES
Permit, allows Rockingham to opportunity to request that EPA Methods
624/625 monitoring requirement for Outfall 001 be removed from the semi-
annual monitoring frequency requirement. Rockingham has established a
compliance history associated with nine (9) sampling events for volatile and
semi -volatile organics, as shown on the attached table.
You will note that there ar'generally no detectable concentrations of volatile
and semi-volatiles present in these samples. Of the 9 samples collected
since the permit was issued, chloroform was present in one sample (19 ug/l),
toluene was present in two samples (10 ug/I and 18 ug/I), and total xylenes
were present in three samples (29 ug/I, 14 ug/I, and 20 ug/I). Generally

NCDWQ
April 13, 2004
Page 2
pollutants were present in samples collected two years or so ago at
concentrations only slights greater than the practical quantitation limit.
Inasmuch as the State of North Carolina has not, to our knowledge,
promulgated effluent standards for any of these parameters, and inasmuch as
an "aquatic life" water quality standard has only been promulgated for toluene
(11 ug/I) for Class C waters (which apply outside the mixing zone of an
effluent with a waterbody), and inasmuch as outfall 001 initially discharges to
an unnamed tributary stream before subsequently discharging into Jacob's
Creek, we feel that no violation of water quality standards for these
parameters in Jacob's Creek is being caused by our discharge. Therefore,
we feel justified in requesting the Outfall 001 semi-annual 624/625 (volatile
and semi -volatile organics) monitoring required be removed from the permit.
Rockingham Power appreciates the opportunity to work with NCDENR in
developing this renewal NPDES permit. Rockingham would be pleased to discuss
any of these changes at your convenience. Please feel free to call me at 336/951-
1772, or Barbara Irwin, in our environmental group, at 217/872-2363.
Regards,
James Doubek
Plant Manager, Rockingham Power, LLC.
ATTACHMENT
cc: David Russell — NCDENR, Winston-Salem
Barb Irwin — Dynegy, Decatur
Starla Lacy — Dynegy, Houston

Volatile Organics EPA Method 624
Methylene Chloride
Trichlorofluoromethane
1,1-Dichioroethene
1,1-Dichloroethane
Chloroform
Carbon Tetrachloride
1,2-Dichloropropane
Trichloroethene
Dibromochloromethane
1,1,2-Trichloroethane
Tetrachloroethene
Chlorobenzene
Trans-1,2-Dichloroethene
1,2-Dichloroethane
1,1,1-Trichloroethane
Bromodichloromethane
Cis-1, 3-Dischloropropane
Benzene
Trans-1,3-Dichloropropene
Bromoform
1,1,2,2-Tetrachloroethane
Toluene
Ethyl Benzene
Chloromethane
Bromomethane
Vinyl Chloride
Chloroethane
Total Xylenes
Rockingham Power, LCC
Summary Table
Quantitative
11/27/2000
5/17/2001
12/11/2001
1/9/2001
5/3/2002
11/1/2002
2/12/2003
6/9/2003
1/14/2004
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL BQL
BQL BQL
BQL BQL
BQL
BQL 0.029
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL BQL
0.010 I BQL
QL BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
0.014
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BOL
BQL
BQL
BQL
BOL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
0.020
BQL
BQL
BQL
BQL
BQL
BQL 410,411 A
BQL BQL f♦1i
BQL BQL
BQL BQL
BQL BQL
BQL BQL
BQL BQL
BQL BQL
BQL BQL
BQL BQL
BQL BQL
BQL BQL
BQL BQL
BQL BQL
BQL BQL
BQL BQL
BQL BQL Lh
BQL BQL 1\)0, k
BQL BQL
BQL BQL
BQL BQL
BQL BQL 11
BQL BQL 7'bO a
P
BQL
BQL
BQL
Semi -volatile Organics EPA Method 625
4-Chloro-3-methylphenol 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
2-Chlorophenol 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
2,4-Dichlorophenol 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
2,4-Dimethylphenol 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
2,4-Dinitrophenol 0.050 BQL BQL BQL BQL BQL BQL BQL BQL BQL
2-Methy1-4,6-dinitrophenol 0.050 BQL BQL BQL BQL BQL BQL BQL BQL BQL
2-Nitrophenol 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
4-Nitrophenol 0.050 BQL BQL BOL BQL BQL BQL BQL BQL BQL
Pentachlorophenol 0.050 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Phenol 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
2,4,6-Trichlorophenol 0.010 QL QL QL QL QL QL QL QL QL

Acenaphthene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Acenaphthylene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Anthracene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Benzidine 0.050 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Benzo(a)anthracene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Benzo(a)pyrene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Benzo(b0)fluoranthene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Benzo(ghi)perylene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Benzo(k)fluoranthene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Benzyl butyl phthalate 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Bis(2-chloroethoxy)methane 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Bis(2-chloroethyl)ether 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Bis(2-chloroisopropyl)ether 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Bis(2-ethyl-hexyl)phthalate 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
4-Bromaphenyl phenyl ether 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
2-Chloronaphthalene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
4-Chlorophenyl phenyl ether 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Chrysene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Dibenzo(a,h)anthracene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
1,2-Dichlorobenzene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
1,3-Dichlorobenzene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
1,4-Dichlorobenzene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
3,3-Dichlorobenzidine 0.020 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Diethyl phthalate 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Dimethyl phthalate 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Di-N-Butyl phthalate 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
2,4-Dinitrotoluene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
2,5-Dinitrotoluene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Di-N-Octyl phthalate 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
1,2-Diphenythydrazine 0.050 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Fluoranthene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Fluorene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Hexachlorobenzene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Hexachlorobutadiene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Hexachlorocyclopentadiene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Hexachloroethane 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Indeno(1,2,3-cd) pyrene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Isophorone 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Naphthalene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Nitrobenzene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
N-Nitrosodimethylamine 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
N-nitrosodi-n-propylamine 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
N-Nitrosodiphenylamine 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Phenanthrene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
Pyrene 0.010 BQL BQL BQL BQL BQL BQL BQL BQL BQL
1,2,4-Trichlorobenzane 0.010 QL QL QL QL QL QL QL QL QL

NCDENR / DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
Dynegy, Inc.
d.b.a. Rockingham Power LLC
NPDES No. NC0086665
Facility Information
1. Facility Name:
Rockingham
Power LLC
6. Pretreatment Program:
No
2. Permitted Flow.MGD:
No limit
7. County:
Rockingham
3. Facility Class:
8. Regional Office:
Winston-Salem
4. Facility Status:
Existing
9. USGS Topo Quad:
B19SE
5. Permit Status:
Renewal
10. USGS Site:
Stream Characteristics
1. Receiving Stream:
UT Jacobs Creek
2. Subbasin:
030203
Roanoke RB
8. Drainage Area (mi2):
NA
3. Index No.:
9. Summer 7Q10 (cfs)
NA
4. Stream Class:
C
10. Winter 7Q10 (cfs):
NA
5. 303(d) Listed:
NO
11. 30Q2 (cfs):
NA
6. 305(b) Status:
NA
12. Average Flow (cfs):
NA
7. Use Support:
13. IWC (%):
100
Conditions Incorporated into Permit Renewal
Proposed Conditions
Parameters Affected
Basis for Condition(s)
Change Lest from episodic to
annual
Acute Toxicity Test
Facility has passed all acute
tests, therefore continue at
annual monitoring frequency.
Add monthly effluent monitoring,
requirement.
Total Lead
Detetedsm contact stormwater
sample collected 8/7/01 at
29ug/1.
Change permit expiration date to
4/30/2007.
Expiration Date
Per basin renewal schedule.
PROJECT NOTES
Summary
• This is a permit renewal for a minor industrial facility that generates 900 MW of electricity
for peak demand. Rockingham Power LLC generates electricity by 5 combustion gas
turbines using natural gas as a primary fuel and #2 fuel oil as a backup. Natural gas is
delivered to the site via pipeline, while fuel oil is stored in two 2.25 MG onsite tanks with
secondary containment.

NPDES PERMIT FACT SHEET Dynegy, Inc.
Page 2 NPDES No. NC0086665
• The permit regulates the discharge of process water (evaporative cooling water) and contact
stormwater (from contaminants around oil storage sources). Sanitary wastewater is treated
by an onsite subsurface disposal system. The facility employs 12 staff.
• This facility discharges intermittently to an unnamed tributary to Jacobs Creek (Class C),
which then flows into the Dan River. The intermittent cooling water discharge ranges from
0-7,200 gpd, while the intermittent process water discharge ranges from 0-18,000 gpd.
Jacobs Creek is not listed as an impaired waterbody on the 2002 303(d) List.
Permit Development
• Authorization to Construct Permit. An ATC was issued for the construction of an oil/water
separator in 1999, and an Engineer's Certification of Construction Completion was signed
5/17/2000.
• Historical NPDES Permitting. This permit was originally issued on 11 / 19/ 1999 and expired
4/30/2002. A renewal application was received on 10/18/2001. A permit modification
dated 1/5/2001 changed the toxicity test type from chronic to acute.
• Effluent Guidelines. Federal Effluent Guidelines do not apply to this facility, which
produces electricity for peak demand via combustion gas turbines. EPA Effluent Guidelines
(40 CFR 423) are only applicable to steam turbine facilities. The previous permit regulated
parameters typical to cooling water discharges (e.g., turbidity and temperature) as well as
parameters associated with bulk oil storage terminals (Acute tox, TSS, Oil&Grease, EPA
Method 624/625). This permit renewal maintains the same limits/monitoring, with the
addition of lead sampling based on a detection of lead (29 ug/1) in a contact stormwater
sample collected 8/7/01. There were no detections of EPA Method 624/625 parameters in
samples collected in May 2002 and June 2003.
DMR Data.
• Effluent Toxicity Data. Facility passed 8 of 8 acute toxicity tests (24-hour, fathead minnow)
between 1999-2003.
• Compliance Data. The facility received an NOV for exceeding the TRC limit on 8/19/02,
which the facility attributed to chlorine being added to the municipal source water.
WLA Data.
• Historical data indicates this is a zero flow stream.
Proposed Schedule for Permit Issuance
Draft Permit to Public Notice:
Permit Scheduled to Issue:
State Contact
03/24/04
05/24/04
If you have any questions on any of the above information or on the attached
permit, please contact Tom Belnick at [phone], extension 543.
Copies of the following are attached to provide further information on the permit
development:
• Draft Permit
NPDES Recommendation by:
Signature
Page 2
Version: March 16, 2004
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ROCKINGHAM POWER, LLC
240 Ernest Drive
Reidsville, NC 27230
[phone]
February 27, 2002
Mr. Tom Belnick
North Carolina Department of Environment and Natural Resources
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: NPDES Permit No. NC0086665
Revision to Application to Renew (Submitted October 16, 2001)
Dear Sir:
Rockingham Power, LLC is providing within a revised water and wastewater flow
diagram to replace Figure 7 in Rockingham's October 16, 2001 Application to Renew
submittal. The revision is being provided due to operational changes made at
Rockingham after the construction of the plant was completed. These changes will now
allow oily water from the turbine package to drain to the oil/water separator instead of to
the turbine sumps, as stated in the initial permit application.
Rockingham Power is requesting this revised Figure 7 be included in the review of the
October 16, 2001 Application to Renew.
If you have any questions about the revised Figure 7 or about other changes being
requested in our October 16, 2001 Application to Renew submittal, please feel free to
contact me at 336/951-1772 or Barbara Irwin in our environmental group at 217/872-
2363.
Sincerely,
Jim Doubek
Plant Manager
Attachment:
cc: Barb Irwin — Decatur
Starla Lacy — Houston

Community
Water
225 (max)
Potable
Water
System
Rockingham Power, L.L.C.
Rockingham County, North Carolina
Water and Wastewater Flow Diagram
Units 1, 2, 3, 4 & 5
Process Water
Storage
1
•
On -Site
Septic
System
Units 1, 2, 3, 4 & 5
Contact Stormwater
(from containments
around oil storage
sources)
300
Rental
Demineralizer
NOx Injection
Water
Evaporation
A
300 (only when burning
liquid fuels)
300
Units 1, 2, 3, 4 & 5
Demineralized
Water Storage
Tank
Int.
Units 1, 2, 3, 4 & 5
Service Water
System
Area
Washdown
Intermittent
25
125
Air
Conditioner
Condensate
25
Units 1, 2, 3, 4 & 5
Oily Water
Flow values are reported as summer average flows in gpm units.
Evaporation
105
Units 1, 2, 3, & 4
Intermittent Blowdown
20
•
Units 1, 2, 3, 4 & 5
On -Line
Combustion
Turbine
Compressor Wash
1' Intermittent
Units 1, 2, 3, 4 & 5
Inlet Air
Evaporative
Cooling System
5
•
1,000 gallons/year
Unit 5 Intermittent
Blowdown
Units 1, 2, 3, 4 & 5
Oil/Water Separator
1
Off -Site
Disposal
►
Units 1, 2, 3, 4 & 5
Off -Line
Combustion
Turbine
Compressor Wash
1,000 gallons/year
•
Units 1, 2, 3, 4 & 5
Washwater
Storage Tanks
Plant Site Noncontact
Stormwater
Intermittent
Proposed
Outfall 001
100
Intermittent
•
Final Discharge to
Unnamed Tributary
to Jacob's Creek
(Current Outfall 001)
Figure 7

Rockingham Power, L.L.C.
240 Ernest Drive
Reidsville, North Carolina 27320
[phone]
October 16, 2001
North Carolina Department of Environment and Natural Resources
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Gentlemen:
NPDES Permit No. NC0086665
Application to Renew
In accordance with the provisions of North Carolina state regulations at 15A
NCAC 2H.0106(b) and the expiration date of the aforementioned current NPDES
permit, Rockingham Power, L.L.C. is pleased to submit herein its application to
renew the NPDES permit for the Rockingham Plant. The application consists of
one original and two copies of North Carolina's NPDES Permit Application Short
Form C and several supporting documents including (a) USGS topographic
drawings (Figures 1 through 4), (b) two site drawings (Figures 5 and 6), (c) a
water and wastewater flow diagram (Figure 7), (d) discharge sampling analytical
data sheets, and (e) a chain of custody form for the wastewater samples
collected for this application.
Sampling of plant effluents for purposes of renewing the NPDES permit was
performed on August 7, 2001 at the Rockingham Unit 1, 2, 3, 4, and 5 oil/water
separator discharge point and the Unit 5 evaporative cooling water discharge
point (see the enclosed water and wastewater flow diagram; Figure 7). These
waste streams are both contributory to Outfall 001.The results of those analyses
are tabulated on the enclosed analytical data sheets. Sanitary wastewaters at the
plant are treated by a permitted on -lot subsurface disposal system.
With this application, Rockingham Power, L.L.C. is requesting that the existing
NPDES permit be reissued, but with a different regulated outfall and a revised list
of regulated parameters for this outfall. The current permit regulates the final
outfall from the plant which includes noncontact stormwater runoff from the plant
site. Rockingham Power, L.L.C. is proposing that an internal plant outfall be
regulated instead (see Figures 6 and 7). This outfall conveys only process
wastewaters and contact stormwaters from the plant. Monitoring at this location
is more representative of the process and contact stormwater discharges from
the plant, can be more accurately conducted, and can be better controlled. These
changes were discussed with Mr. Michael Myers (NCDENR, Water Quality
Page 1

Division) on Monday, July 2, 2001 during a telephone call with personnel in our
Decatur, IL office.
Therefore, four changes in the current permit are being requested, those being:
(1) Redesignate the current Outfall 001 as "Process Wastewaters and
Contact Stormwaters from Units 1, 2, 3, 4 and 5".
Contributory wastewater streams to this outfall consist of the plant
oil/water separator discharge and evaporative cooling waters from Unit 5
(see attached water and wastewater flow diagram; Figure 7). The plant
oil/water separator discharge consists of contact stormwaters from
containments around two no. 2 fuel oil storage tanks and oil -filled electrical
equipment, service water system blowdowns, area washdown, and air
conditioner condensate discharges from Units 1 through 5, and turbine
inlet air evaporative cooling water system blowdowns from Units 1 through
4 (see attached water and wastewater flow diagram; Figure 7). The
evaporative cooling water system blowdown from Unit 5 is conveyed
directly to Outfall 001 (rather than through the oil/water separator)
because Unit 5 was added after the underground construction of Units 1
through 4 had been completed. Evaporative cooling water is raw water
that is injected into the turbine inlet air stream to cool the air.
Discharges from the outfall will be intermittent in frequency, depending
largely on discharges from the oil/water separator. Oil/water separator
discharges are influenced primarily by precipitation and plant operations.
Design average and design maximum instantaneous discharge flowrates
from the separator (and Outfall 001) will be 100 gpm and 200 gpm,
respectively. Discharge durations will range from 10 to 30 minutes.
(2) Delete "temperature" as a regulated parameter in the 001 discharge.
A combustion gas turbine plant differs from a conventional steam -electric
fossil -fuel plant in that only the inlet air to the turbine is required to be
cooled (to improve turbine efficiency). There is no steam to condense as
in a conventional steam -electric plant.
Gas turbine power output is directly related to ambient inlet air
temperature. Power generation decreases when ambient inlet air
temperatures increases. The purpose of the evaporative cooling water
system is to offset power loss during high summer inlet air temperatures.
Essentially 100 percent of this evaporative cooling system water is
evaporated. Any excess cooling waters are collected and periodically
blowndown either to the oil/water separator (for Units 1 through 4 or
directly to Outfall 001 from Unit 5). The temperature of this blowdown
Page 2

would vary with ambient air temperatures; therefore, waters in the
separator and the outfall will not be heated.
(3) Delete "turbidity" as a regulated parameter in the 001 discharge.
Turbidity is closely associated with the presence of total suspended solids
(TSS). As TSS concentrations are already limited by the permit in this
discharge, the additional limiting of turbidity seem redundant.
(4) Delete the "Daily Maximum 17 ug/I Total Residual Chlorine (TRC)
Effluent Limitation".
Rockingham Power, L.L.C. is requesting the effluent limitation be removed
for this parameter for two reasons. First, Rockingham Power, L.L.C. adds
no chlorine to the process waters or cooling waters used in the plant. The
plant uses chlorinated water supplied by Rockingham County. Any
chlorine present in the discharge from the plant is that which remains in
the plant's incoming water supply. And second, the current effluent
limitation is identical to the TRC water quality standard for Class C trout
waters (15A NCAC 02B.0211(I)(iv)). Rockingham Power does not believe
that the waters of the unnamed tributary to Jacobs Creek, or the waters of
Jacobs Creek itself are designated as "trout" streams. Rockingham Power,
L.L.C. is willing to continue monitoring this parameter, however, for the
purpose of developing a record of TRC concentrations in the discharge.
Rockingham Power, L.L.C. appreciates the opportunity to submit these
comments to you with our application to renew the plant's NPDES permit. We
understand that there is no fee for the filing of this application. If you have
questions about the changes being requested in our existing NPDES permit or
the information contained in the enclosed application forms, please feel free to
contact me (tel. no. 336-951-1772) or Barbara Irwin (tel. no. 217-872-2363) in the
Environmental Group at our Decatur, IL office.
Sincerely,
Rockingham Power, L.L.C.
(1_
James Doubek
Plant Manager
l
cc: B.Irwin/G.Eversole/B.J.Marshall/T.Davis — DMT Decatur, IL Environmental
Grou
P
S.Lacy — Dynegy Marketing and Trade Environmental Director- TC126
Page 3

NPDES PERMIT APPLICATION - SHORT FORM C
For manufacturing or commercial facilities with a discharge <1 MGD (or WTPs)
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
North Carolina NPDES Permit Number NC0086665
Please print or type
1. Applicant and facility producing discharge
A. Name: Rockingham County LLC Combustion Turbine Facility
B. Mailing address of applicant:
Street address: 240 Ernest Drive
City: Reidsville
State: North Carolina
County: Rockingham
Zip Code: 27320
Telephone Number: ( 336) 951 - 1772 ext. 225
Fax Number: ( 336) 951 - 0308
e-mail address: Jim. Doubek(a)dvnegy.com
C. Location of facility:
Street: 240 Ernest Drive
City: Reidsville County: Rockingham
State: North Carolina Zip Code: 27320
2. Standard Industrial Classification (SIC) code(s): 4911
3. Number of employees: 12
4. Principal product(s) produced: Electricity
Principal raw material(s) consumed: Natural gas, #2 fuel oil
5. Principal process(es): Combustion gas turbine generation of 900 megawatts of electricity.
6. Amount of principal product produced or raw material consumed
(List specific amounts consumed andlor units of production)
Product Produced or Raw Material Consumed
(AVERAGE)
Product Produced or Raw Material Consumed
(PEAK)
per Day
per Month
per Year
Limited to 3000 hrs. each unit per year with
1000 hrs. each unit per year limit for fuel oil.
7. (a) Check here if discharge occurs all year Y. , or
(b) Circle the month(s) in which discharge occurs: January February March April May June July
August September October November December
(c) Days per week discharge occurs: 7
NOTE: If the facility has separate discharge points (outfalls) or multiple industrial processes, include a schematic diagram
of wastewater flow at the facility.
Page 1 of 2
Version -6-99

NPDES PERMIT APPLICATION - SHORT FORM C
For manufacturing or commercial facilities with a discharge <1 MGD (or WTPs)
8. Types of wastewater discharged to surface waters only (check as applicable).
Discharge per operating day
Flow
(GALLONS PER OPERATING DAY)
Volume treated before discharging
(PERCENT)
Sanitary - daily average
0
Cooling water, etc. - daily average
Intermittent; 0 — 7,200
0
Process water - daily average
And Noncontact stormwater
Intermittent; 0 — 18,000
100
Maximum per operating day for
total discharge (all types)
Intermittent; 0 — 25,200
70
9. If any of the types of wastewater identified in item 8 (either treated or untreated) are discharged to places
other than surface waters, record the amount(s) discharged below:
A. Municipal sewer system 0 qpd
B. Underground well 0 gpd
C. Septic tank 360 gpd
(minimum 750 gallon septic tank)
D. Evaporation lagoon or pond 0 gpd
E. Other, specify 0 gpd
10. Number of separate discharge points: 1
11. Name of receiving stream(s): unnamed tributary to Jacobs Creek
12. Does your discharge contain or is it possible for your discharge to contain one or more of the following
substances added as a result of your operations, activities, or processes? Circle all that apply:
aluminum ammonia beryllium cadmium chromium chlorine (residual) copper cyanide lead
mercury nickel oil and grease phenols selenium zinc None of the above
I certify that I am familiar with the information contained in the application and that to the best of my
knowledge and belief such information is true, complete, and accurate.
James Doubek
Printed name of Person Signing
Plant Manaoer
Title
Signatuyd of Applicant ate
North Carolina General Statute 143-215.6 (b)(2) provides that: Any person who knowingly makes any false statement representation, or certification in any
application, record, report, plan, or other document files or required to be maintained under Article 21 or regulations of the Environmental Management
Commission implementing that Article, or who falsifies, tampers with, or knowingly renders inaccurate any recording or monitoring device or method
required to be operated or maintained under Article 21 or regulations of the Environmental Management Commission implementing that Article, shall be
guilty of a misdemeanor punishable by a fine not to exceed $10,000, or by imprisonment not to exceed six months, or by both.
Page 2 of 2 Version -6-99

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Figure 4

ROCKINGHAM POWER, L.L.C.
Reidsville
Rockingham County
North Carolina
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Community
Water
225 (max)
♦
Potable
Water
System
On -Site
Septic
System
Units 1, 2, 3, 4 & 5
Contact Stormwater
(from containments
around oil storage
sources)
Rockingham Power, L.L.C.
Rockingham County, North Carolina
Water and Wastewater Flow Diagram
Units 1, 2, 3, 4 & 5
Process Water
Storage
300
Rental
Demineralizer
300
NOx Injection
Water
300 (only when burning
liquid fuels)
Units 1, 2, 3, 4 & 5
Demineralized
Water Storage
Tank
♦
Units 1, 2, 3, 4 & 5
Service Water
System
Area
Washdown
Intermittent
25
Flow values are reported as summer average flows in gpm units.
125
Air
Conditioner
Condensate
1
25
41
Evaporation
105
Units 1, 2, 3, & 4
Intermittent Blowdown
20
01 Units 1, 2, 3, 4 & 5
Oil/Water Separator
►
♦
Units 1, 2, 3, 4 & 5
Inlet Air
Evaporative
Cooling System
4 •
5
Int.
Evaporation
Units 1, 2, 3, 4 & 5
On -Line
Combustion
Turbine
Compressor Wash
Intermittent
1 000 gallons/year
Unit 5 Intermittent
Blowdown
4
Off -Site
Disposal
►
♦
Units1,2,3,4&5
Off -Line
Combustion
Turbine
Compressor Wash
1,000 gallons/year
Units 1, 2, 3, 4 & 5
Washwater
Storage Tanks
Plant Site Noncontact
Stormwater
Intermittent
100
Proposed
Outfall 001
Intermittent
Final Discharge to
Unnamed Tributary
to Jacob's Creek
(Current Outfall 001)
Figure 7