NC0004979_Wasteload Allocation_19960311 (2)

PERMIT NO.: NC0004979
PERMITTEE NAME: Duke Power Company
FACILITY NAME: Plant Allen
Facility Status: Existing
Permit Status: Renewal
Major _q Minor
Pipe No
003
Design Capacity: -6.3-
Domestic (% of Flow):
Industrial (% of Flow): 100%
Comments:
Once through non -contact coolina water.
RECEIVING STREAM: . South Fork Catawba River:
Class: WS -V
Sub -Basin
03-08-36
NPDES WASTE LOAD ALLOCATION
Reference USGS Quad: G14NE (please attach)
County: Gaston
Regional Office: Mooresville Regional Office
Previous Exp. Date: 8/31/96 Treatment Plant Class:
Classification changes within three miles:
Requested by: Mark McInn�ttire Date: 3/11/96
Prepared by: Date:
Date: S
Reviewed by: Date: &
E LA_
Modeler
Date Rec.
#
BODS (mg/1)
Drainage Area (mit) p �SAvg. Streamflow (cfs): 906
7Q10 (cfs) %,? 7 Winter 7Q10 (cfs) ;U 7 30Q2 (cfs) 30 %
Toxicity Limits: IWC % Acute/Chronic
Instream Monitoring:
Parameters
Upstream Location
Downstream Location
Effluent
Characteristics
Summer
Winter
BODS (mg/1)
NH3-N(mg/1)
D.O. (mg/1)
TSS (mg/1)
F. Col. (/100 ml)
pH, (SU)'
Comments: �""
r

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requester:
Date of Request:
Topo Quad:
FACT SHEET FOR WASTELOAD ALLOCATION
Duke Power / Plant Allen
NC0004979-003
100% Industrial
existing
renewal
South Fork Catawba River
WS -V
03-08-36
Gaston
Mooresville Sgv
Mark McIntire
3/11/96
G14NE
Request # 8462
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
flows from 1994
WLA
635
124
227
806
309
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
This WLA is for discharge 003.
Pipe 003 discharges once though, non -contact cooling water from oil coolers, boiler feed pump
hydraulic coolers, and other miscellaneous equipment coolers.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by: Z
Reviewed by
Instream Assessmen
Regional Supervisor
Permits & Engineeri
OAL N� AA&lkl�� Date: q11 a&�
—Date: `51vq�ing: Date:
12- -Mibl
4000�
RETURN TO TECHNICAL SUPPORT BY: V y l %il 13. 1 g 9 LP

r_
;.

2
TOXICS/METALS/CONVENTIONAL PARAMETERS
Recommended Limit: N/A
Existing Limit: N/A
Monitoring Schedule: N/A
Existing Limits
Monthly Avg. Daily Max. Monthly Avg. Daily Max.
Flow (MGD): monitor
Recommended Limits
Monthly Avg. Daily Max. WQ or Guideline Daily Max.
Flow (MGD): monitor
Chlorination of the once through cooling water, discharged through outfall 003, is not allowed
under this permit.
Limit Changes due to:
No limit changes recommended.
Parameter(s) are water quality limited. For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
OR
No parameters are water quality limited, but this discharge may affect future allocations.

3
INSTREAM MONITORING REQUIREMENTS
Upstream Location: N/A
Downstream Location: N/A
Parameters: N/A
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adgquacy of Existing Treatment
Has the facility de onstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes 7 No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Special Instructions or Conditions
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach updated evaluation of facility, including toxics analysis, modeling analysis if
modeled at renewal, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0004979
PERMITTEE NAME: Duke Power Company
FACILITY NAME: Plant Allen
Facility Status: Existing
Permit Status: Renewal
Major Minor
Pipe No.: "@,@v,4
Design Capacity: --9.01- -
Domestic (% of Flow):
Industrial (% of Flow):
100%
Comments:
Once"throuL:h non -contact coolingwater.
RECEIVING STREAM: : Catawba River
Class: WS -V
Sub -Basin: 03-08-34
Reference USGS Quad: G14NE (please attach)
County: Gaston
Regional Office: Mooresville Regional Office
Previous Exp. Date: 8/31/96 Treatment Plant Class:
Classification changes within three miles:
Requested by: Mark McIntire Date: 3/11/96
Prepared by: Date: S Z
Reviewed by: Date: ur a �i (D
Bob : =
�l
L S �
Modeler
Date Rec.
I#
LyM,o
Drainage Area (mit) Avg. Streamflow (cfs):
7Q10 (cfs) Winter 7Q10 (cfs)�_ 30Q2 (cfs)
Toxicity Limits: IWC % Acute/Chronic
Instream Monitoring:
Parameters
Upstream Location
Downstream Location
Effluent
Characteristics
Summer
Winter
BODS (mg/1)
NH3-N(mg/1)
D.O. (mg/1)
TSS (mg/1)
F. Col. (/100 ml)
pH (SU)
Flo W
manerL
w�
Comments:

{ � r

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requester:
Date of Request:
Topo Quad:
WS -IV & B CA
03-08-34
Gaston
N.C. DEPT. op
ENVIRONMENT
FACT SHEET FOR WASTELOAD ALLOCATION NATU.�j R�6E��`,
USGS #
APR m. M6
Mark McIntire
Request # 8463
Plant Allen -Duke Power Company.i!lSIQN±
p� E7dV1i(JR�9Lf8A�L
NCO004979-004
RfOG�RESVfLL& RECIURAL�. Q Ff LIE
' n.: r
100% Industrial
Winter 7Q10 (cfs):
95
existing
..
95
renewal'
30Q2 (cfs):
Catawba River
�'"'
-=�
WS -IV & B CA
03-08-34
Gaston
Stream Characteristic:
Mooresville 3'$0-
USGS #
from 1994 WLA
Mark McIntire
Date:
3/7/96
Drainage Area (mi2):
G 14 NE
Summer 7Q10 (cfs):
95
Winter 7Q10 (cfs):
95
Average Flow (cfs):
95
30Q2 (cfs):
IWC (%):
16%
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
This WLA is for outfall 004.
Outfall 004 discharges once through, non -contact cooling water as well as water from a vehicle
washing area. No soaps or other additives are used in the vehicle washing area.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by:4A.'a) Date:
Reviewed by
Instream Assessmen
Regional Supervisor
Permits & Engineeri
t: Date: qllam 0
Date: 2 '96
ng: Date: ✓�?/ ��
RETURN TO TECHNICAL SUPPORT BY:�� 13 I

Y n
2
TOXICS/METALS/CONVENTIONAL PARAMETERS
Recommended Limit: N/A
Existing Limit: N/A
Monitoring Schedule: N/A
Existing Limits
Monthly Avg. Daily Max. Monthly Avg. Daily Max.
Flow (MGD): monitor
OR and Grease (mg/L): 15.0 20.0
Recommended Limits
Monthly Avg. Daily Max. WQ or Guideline Daily Max.
Flow (MGD): monitor
Oil and Grease (mg/L): 15.0 20.0
Limit Changes due to:
No limit changes recommended.
Parameter(s) are water quality limited. For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
OR
No parameters are water quality limited, but this discharge may affect future allocations.

a
3
INSTREAM MONITORING REQUIREMENTS
Upstream Location: N/A
Downstream Location: N/A
Parameters: N/A
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
AAd wary of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new -limits with existing treatment
facilities? Yes ✓ No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
0
Special Instructions or Conditions
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach updated evaluation of facility, including toxics analysis, modeling analysis if
modeled at renewal, and description of how it fits into basinwide plan)
Additional Information attached? , (Y or N) If yes, explain with attachments.

DIVISION OF ENVIRONMENT MANAGEMENT
May. 5, 1994
MEMORANDUM
TO: Randy Keplerp
THRU: Ruth Swanek/� s A
Carla Sanderson
FROM: Jacquelyn M. Nowe11.�1�N
SUBJECT: Duke Power Company - Allen Steam Station -Outfall 002
NPDES Permit No. NC0004979
Gaston County
The Instream Assessment Unit has reviewed the correspondence from the subject
facility concerning the addition of groundwater remediation discharge to the ash basin.
Duke Power has indicated that an oil/water separator will be installed for treatment of this
contaminated groundwater. Current Division procedure requires that for petroleum
contaminated groundwater remediations, the minimum treatment will include an oil/water
separator, air stripping or diffused aeration and activated carbon adsorption. If Duke
Power installs this treatment there should be no problem with adding this wastestream to
the existing facility.
A review of the data submitted indicates that with the additional groundwater
discharge, the current NPDES permit would have to be modified to include a limit for
benzene of 11 ug/l and effluent monitoring for toluene and MTBE. The existing permit for
the ashbasin discharge does not include monitoring for any of these constituents.
If there are any additional questions, please contact me.
cc: Rex Gleason
�File

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DIVISION OF ENVIRONMENTAL MANAGEMENT
Permits and Engineering/ NPDES Unit
March 24, 1994
Memorandum
TO: Jackie Nowell / Rapid Assessment Group
FROM: Randy Kepler G �,
THROUGH: David Goodrich'Al
SUBJECT: Duke Power Company
Allen Steam Station / NC0004979
Gaston County
The Mooresville Regional Office has issued a Notice of Violation to
Duke Power because of the discovered groundwater contamination caused by
a leaking underground storage tank return line. Duke contends that this
stream is comparable to the existing streams presently being discharged into
the ash basin. The region wants this treated as soon as possible, go Duke has
submitted a request for an authorization to construct for the instillation of an
oil -water separator to be used as part of a current system. There are some
concerns about this waste stream being comparable to the existing NPDES
permit. Would you please review the attached information to determine if
this waste stream could be covered under the existing NPDES permit for
outfall 002 (ash basin discharge) which consists of ash transport water, metal
cleaning wastes, coal pile runoff, domestic wastewater and low volume waste.
I have attached the information Duke submitted, the staff report for the
ATC and a copy of the NPDES permit effluent page for 002.
If you have any questions , please let me know so I can proceed as soon as
possible.
Thank You.

4 J ENS�a
3
Fg1l,G
Duke Power Company
Generation Services Department
13339 Hagers Any Road
Hantersville, NC 28078-7929
September 29, 1993
Ms. Coleen Sullins
Permits and Engineering Unit
NCDEHNR
Division of Environmental Management
P.O. Box 29535
Raleigh, NC 27626-0535
Subject: Groundwater Discharge to Ash Basin
Allen Steam Station
NC#0004979
File: AS -704.15
Dear Ms. Sullins:
Recently, groundwater contamination was discovered at the subject facility, caused
by a leaking underground storage tank return line. We have been issued a Notice
of Violation by the regional office and are required to remediate. In an effort to
promptly respond to this situation, we request your concurrence with Mike Parker
of the Mooresville Regional Office that the ultimate discharge of the separated
groundwater into the ash basin is acceptable.
We intend to install a total product recovery system to withdraw free product from
the ground as quickly as possible. 'This system will remove a mixture of free.`
product (#2. fuel oil) and groundwater it maximum flow -rate of 20: gpm which
_.
will then be routed- through s- oil -v, a*er sepwato. The .removed oil will be
disposed of. with other used oil collected on site. We would like permission to
discharge the separated groundwater into the site sump system and into the ash
basin as shown on the attachment.
Utilizing .ash basins. to treat _a co -mingling of' waste streams=has been shown to be •
an efficient treatment system. _ Our current NPDES permit accepts this treatment
scheme and proper operations are assured_ -by monitoring: selected- parameters such
as oil and grease and' -priority pollutants. -
Preliminary analyses --of thegrouridwater,-as-defined by Jack Floyd of the
Groundwater Section, are follows.`: It is, important to_note-that there was -no .
separation of product or -any other treatment of the -groundwater prior -to this -
analysis and no --significant volume of water was .purged' from the wells prior to
sampling.'
Printed en recycled paper

Compound
RW -2
RW -5
Naphthalene
<250 µg/1
210 µg/l
2 -methylnaphthalene
380 µg/1
330 µg/l
Bis(2-ethylhexyl)phthalate
290 µg/1
<200 µg/1
Di-n-octylphthalate
280 µg/1
<200 µg/1
''Benzene
73 µg/1
35 µg/1
Ethyl Benzene
59 µg/1
48 µg/1
✓Toluene
28 µg/1
30 µg/1
M/P Xylene
170 µg/l
110 µg/1
O -Xylene
78 µg/l
69 µg/1
MTBE
<50 µg/1
<50 µg/l
-/Lead
4.4 µg/1
35 µg/l
)Oil & Grease
38.2 mg/1
4.07 mg/1
**Recovery wells were not developed and free floating oil was not removed from
the wells prior to sample collection.
We have a similar recovery system iri place at a South Carolina facility, which is
removing #2 fuel oil. The following data was obtained from this system and we
feel it is indicative of the removal results that would be seen at Plant Allen.
Compound
Naphthalene
2 -methylnaphthalene
Bis(2-ethylhexyl)phthalate
Di-n-octylphthalate
Oil and Grease
Oil Water
Separator
Influent
Effluent
220 µg/1
<10 µg/1
1900 µg/1
62 µg/1
<200 µg/1
<10 µg/1
<200 µg/1
<10 µg/1
460 mg/l
14 mg/1
The recorded decreases in all parameter values indicate that an oil water separator
accomplishes significant reductions in constituents that otherwise might impact the
environment. The final polish that would be afforded by routing this flow through
the ash basin will further reduce concentrations of dissolved constituents found in
the groundwater. We do not anticipate the presence of dissolved constituents
above detectable levels at the ash basin discharge (002).
This proposal has been discussed with Mike Parker and found to be acceptable.
Additionally there are other locations where we are removing free product and may
need to upgrade those removal systems to remediate the contamination more
expeditiously. Therefore, we would like generic approval to install similar oil -
water separator systems, with similar flows, where final treatment of the
groundwater can be routed through an existing ash basin.

Should you have any questions, or require additional information regarding this
request, please contact me at [phone] or Bob Caccia at [phone].
An expeditious reply would be greatly appreciated as regulations require that we
proceed quickly with a free product removal plan.
Sincerely,
Dayna VRussell, Associate Engineer
Environmental Divisions vJater Protection
Attachments
cc: . Rex Gleason - Mooresville Regional Office
Karen Walker - Mooresville Regional Office
D.L. Scruggs

Groundwater/
Oil Mixture
Groundwater Remediation System
Using Oil/water Separator
Installation Proposal - Flow Diagram
Date: 8/16/93.
Oil/Water
Separator
Oil
Recovered Oil
Collected in a
Drum
Treated
Wastewater
Manufacturer guarantees effluent will contain
less than 10 mg/1 of oil with particle size not
greater than 20 microns.
Sump System
Ash Basin
1
NPDES Outfall

A. (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENT'S - FINAL
Permit No. NC0004979
During the period beginning on the effective date of the permit and lasting until expiration,. the Permittee is authorized to discharge from
outfall serial number 002. Such discharges shall be limited and monitored by the Permittee as specified below:
Effluent Characteristics
Discharge
' Limitations
Monitoring
Requirements
Lbs/day
Units
(Specify)
Measurement
Sample
*Sample
-Mon. Avg. Daily Max.
Mon,
Avg.
Daily Max.
Frequency
Iy—
Location
Flow
Weekly
Pump Logs or
E
Similar readings
Oil and Grease
15.0
mg/i
20.0
mg/I
2/month
Grab
E
Total Suspended Solids****
30.0
mg/I
100.0
mg/I
2/month
Grab
E
Total Copper
1.0
mg/I
1.0
mg/I
2/month
Grab
E
Total Iron
1.0
mg/I
1.0
mg/I
2/month
Grab
E
Total Arsenic
450.0
gg/I
Quarterly
Grab
E'
Total Selenium
45.0
µg/I
Quarterly
Grab
E
Total Nitrogen (NO2 + NO3 + TKN)
Quarterly
Grab
E
Total Phosphorus
Quarterly
Grab
E
Chronic Toxicity**
Quarterly
Grab
E
Pollutant Analysis *"
Annually
E
* Sample Locations: E - Effluent
** Chronic Toxicity (Ceriodaphnia) P/F at 11%; January, April, July, and October; See Part III, Condition P.
** See Part III, Condition Q.
*** Monthly,average of 50 mg/1 is permitted provided that the Permittee can satisfactorily demonstrate the the difference between
30 mg/1 and 50 mg/1 is due to the concentration of total suspended solids in the intake water.
The metal cleaning waste, coal pile runoff, ash transport water, domestic wastewater' and low volume waste shall be discharged into o
the ash settling pond.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored'2/month at the effluent by
grab sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

WEB 2 2 1oc
�Je 7Yt. %L
SOCPRIORITY PROJECT: No
To-: Permits and Engineering Unit
Water Quality Section
Attention: Randy Kepler
Date: February '16, 1994
AUTHORIZATION TO CONSTRUCT
NPDES PERMIT
REPORT AND RECOMMENDATIONS
County: Gaston
MRO No.: 94-32
Permit No. NC0004979
PART I - GENERAL INFORMATION
1. Facility and Address: Allen Steam Station
r/n Duke Power Company
Generation Services Department
133.39 Hagers Ferry Road.
Hunters=ille, N.C. 28078-7929
2. Date of On -Site Investigation (if.conducted): NIA
3. Report Prepared By: Michael L. Parker, Environ. Engr. II
4. Persons Contacted and Telephone Number: Jennifer Rudisill,
(704)J-875-4610.
5. Verified Discharge Point(s), List for All Discharge Points'
Latitude: 3.50 11' 00" Longitude: 81° 00'' 23"
Attach a USES' map extract and indicate treatment facility
site and discharge point on map-., Ensure discharge point(s)
correspond to NPDES permitted discharge points..
USES Quad No.: G 14 NE
6. Site size and expansion area consistent with application?
.Yes. Ample area is available for the construction of -the
proposed oil/water separator.
T. Topography (relationship to flood plain included): The
existing ash pond is not located in the 100 year flood
plain.
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: * MGD.
* Intermittent rased on the operation of the electrical
power generating equipment.
b. Date(s) and construction activities allowed by previous
ATCs issued in the previous two (2), nears: N/A.
C. Actual treatment rapacity of the current facility
(desl g_n volume) : N; A.
d. Description of existing or substantially constructed
WWT facilities: An existing ash settling basin is the
only WWT facility that exist at this site.
2. Type of Proposed Treatment Facility: The applicant proposes
to install an oil/water separator that will_ discharge into
the ash settling basin.
3. Residuals Handling and Utilization/Disposal Scheme: Oil
will be removed as necessary for disposal with a waste oil
contractor.
4. Treatment Plant Classification (attached completed rating
sheet): Class I
5. SIC Code(s): 4911
Wastewater Code(s): 68, 66
Main Treatment Unit rode: 50002
6. Important SOC/JOC or Compliance Schedule Dates: N/A
PART III " EVALUATION AND RECOMMENDATIONS
Duke Power Company requests approval to construct an
oil/water separator to remove free product (No. 2 fuel oil) from
a contaminated site at the subject facility. Duke is presently
removing contaminated groundwater (without separation) and
disposing of the water along with other used oil collected on-
site through a waste oil reclamation firm. Duke Power would like
to construct an oil/water separator and discharge the effluent
into the existing ash basin where it will mix with other waste
streams prior to discharge.

Page Three
In the current NPDES Permit for this facility, outfall 002
(ash basin discharge) consists of the following waste streams:
ash transport water, metal cleaning wastes, coal Dile runoff;
domestic wastewater and low volume waste. In addition, effluent
limitations for oil and grease as well as requirements for
toxicity testing are included in the Permit.
For this reason, it is suggested that an evaluation of Duke
Power's request be performed by t -he TSB and, if their findings
indicate the proposed waste stream to be of similar nature and
quantity as the current waste streams and it is determined that
the proposed waste stream should have minimal impact on effluent
quality based on the projected flow rate, it is recommended that
the request for an RTC be approved. It should he noted that Duke
Power is under a directive from the MRO groundwater section to
remediate the underground contamination as quickly as possible.
If TSB cannot support this request based on the information
provided, it will be necessary for Duke Power to request an NPDES
Permit modification to allow the addition of the proposed waste
stream.
Sign .etre __ Ret ort Pretarer Date
Water Quat, Regional S
/C6 219,
rvisor D6t

a
State of North Carolina
'Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
Mr. Dayna Russell
Water Protection, Environmental Division
Duke Power Company
13339 Hagers Ferry Road
Huntersville, NC .28078-7929
Dear Mr. -Russell:
AY1.9;VA
IT
LAE F=1
June 14, 1993
Subject: Biocide additives
NPDES Permit No. NC0004979
Allen Steam Station
Gaston County
The Division of Environmental Management (DEM) has received the information
concerning the use of Calgon H-212 microbiocide at Allen Steam Station, Gaston County. Our
review has revealed 'that the biocide Calgon H-212 is not appropriate for use in your
application. The proposed biocide .contains the active ingredient tributyltin oxide (TBTO) at
stated concentration of 3% of the whole product. Assuming a final effluent concentration of
0.0014 mg/I whole product, the effluent concentration of TBTO would be 0.42 gg/I. This value
would exceed the N.C. water quality standard for. trial kyltin, which is 0.008 Rg/I. With the
possibility of this discharge occurring for maintenance, this level of TBTO cannot be approved.
Therefore, the DEM deems the biocide unacceptable for use. If you select an alternative biocide,
approval from this division is required beforethe biocide can be utilized at your facility..
If you have any questions, please contact Mr. Larry Ausley at [phone].
cc: Mooresville Regional Office
Technical Support Branch
Central Files
Sincerely,
A. Preston H ward, Jr., P.E.
R
L�
JUN 1993
Jll'
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

State of North Carolina
'Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
Mr. Dayna J. Russell
Environmental Division, Water Protection
Duke Power Company
13339 Hagers Ferry Road
Huntersville, NC 28078-7929
Dear Mr. Russell:
A&41 0
L?EHNFlt
May` 28; 1993
2 8 1993
SUPPORT BRAhiCH
Subject: N, DES Permit No. NC0004979
Aln Steam Station
OSMO AD -20 Approval
Gaston County
tai
The Division of Environmental Management (DEM) has received the information in the
letter of March 5, 1993, concerning the use of OSMO AD -20 at your facility in Gaston County.
Our review has revealed that OSMO AD -20 as stated by you should be appropriate for use in
your application. Therefore, the DEM grants approval to Duke Power Co. for the use of OSMO
AD -20 at Allen Steam Station for use in the Reverse Osmosis Unit.
Should you plan to change to a different additive in the future, you should contact this
office and submit the appropriate information for approval prior to the change.
If you have any questions, please contact Mr. Randy Kepler of [phone].
Sinc ely,
Preston H ard, Jr., P.E.
cc: Mooresville Region_ al Office
_Technical Support Branch
Central Files
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,

DIVISION OF ENVIRONMENTAL MANAGEMENT
May 7, 1993
ul u•:_►i�I1��i�
M. Randy Kepler
FROM:acquely_n —. Nowell
THRU: Ruth Swanek 'i2(-
Carla Sanderson
SUBJECT: Duke Power - Allen Steam Station
Permit No. NC0004979
Gaston County
The Technical Support Branch has reviewed the March 5th letter from the subject
facility regarding the use of OSMO AD -20 as a membrane cleaner. According to the
letter, approximately 450 gallons of OSMO-AD-20 will eventually be discharged through
the ash settling basin (outfall 002). Considering the volume of the ash basin and the
amount of this substance, we would not anticipate any problems. This outfall currently has
a chronic toxicity limit of 11% and if the addition causes any problems, it should be
detected. In addition, after reviewing the Material Safety Data Sheet, Technical Support
recommends approval of its use.
If there are any questions, please contact me.
cc: Rex Gleason

MEMO
TO: �—
DATE: -3-19-93
SUBJECT:i�L X1`1 I �i,M )A�'wj
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From:
North Carolina Department of Environment
Health, and Natural Resources ��� printed on Recycled Paper
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Duke Power Company
Generation Services Department
13339 Hagers Ferry Road
Huntersville, NC 28078-7929
e),DUKE POWER
March 5, 1993
Ms. Colleen Sullins
Permits and Engineering Unit I
North Carolina Department of Environment
Heath and Natural Resources U11,t�I
Division of Environmental Management ��`" I j~
P.O. Box 29535
Raleigh, NC 27626-0535
Subject: Use of OSMO AD -20
Allen Steam Station - NC0004979
File:" AS -704.15_ -
Dear Ms. Sullins:
This is to notify you of our intent to use OSMO AD -20, a
product used to clean the membrane of the reverse -osmosis
(RO) unit at Allen Steam Station. The RO unit is used to -
increase efficiency of the filtered water demineralizers,
thereby reducing the amount of regenerative. chemicals used.
Approximately 30 lbs. of this cleaner will be mixed with
450 gallons of water, and once used, will be discharged to
the building sump and pumped to the ash basin. This
process will take place every several months as necessary.
The Material Safety Data Sheet for this product is
attached. Should you require any additional information,
please contact me at [phone].
Sincerely,
Dayna J. Russell, Associate Engineer
Environmental Division, Water Protection
Attachments
cc: -D.L. Scruggs
J.J. Kim
Mooresville Regional Office
Printed on recycled paper

JAN 1121993
osmanics WE
® 5951 CLEARWATER DRIVE * MINNETONKA, MNNESOTA 55343-8990 U.S.A. .
TELEPHONE [phone] FAX [phone]
Product Name: OSMO AD -20
Manufacturer/Supplier:
Osmonics, Inc.
5951. Clearwater Drive
Minnetonka, MN 55343-8990
Emergency Telephone:
612/933.2277
800/424.9300 CHEMTREC
Product Name: OSMO AD -20 Acid Cleaner
Date Prepared: 23 SEPTEMBER 92
NFPA Codes:
Health: 3
Fire: 0
Reactivity: 0
Special: None
Eff,"mrs
Boiling Point: Not Applioable
Vapor Pressure: Not Applicable
(mm 148 & temp)
Vapor Density: Not Applicable
Solubility in Nater: Highly soluble
,appearance and Odor: Solid, white powder
7AA M. .., - e-.
SpeciPc Gravity: Not Applicable
Freezing Point: Not Applicable
Evaporation hate: Not Applicable
(_H =1)
Water Reactive: No
pH. 1.9 (1% solution)

Flash Point: *Not Applicable
Auto Iotion Temp.: Not Applicable
Flammability Limits in Air % By Volume
Lower Explosive Limit (LEL); Not Applicable
Upper. Explosive Limit ([TEL): Not Applicable
Special I! ire Fighting Procedures: Persons exposed to products of combustion should wear
self-contained breathing apparatus (SCBA) and complete personal protective equipment
Unusual Fire and Explosion Hazards: Decomposition products include highly,toxic oxides of sulfur.
0
Stability: Stable
Reactivity: Violent reaction with Cl. (chlorine) and fuming HNO, (nitric acid).
Conditions to. Avoid: Avoid contact with acids.
Hazardous Decomposition: When heated to decomposition or on contact with acid or acid fumes, may
emit highly toxic fumes of SOx
,.�
Emergency Overview: In solution, this product is corrosive, wear proper personal protective equipment
when handling.
Potential Health Effects
Eye: Direct eye contact will cause bums and may cause permanent damage, even blindness.
Skin: Can cause irritation and may cause bums if wet-
-Ingestion: Harmful if swallowed.
Inhalation: Not an expected route of exposure. Inhalation of dust may irritate and may damage
upper respiratory tract and lungs.
Chronic/Carcinogenicity
NTP: Not listed
OSHA: Not listed
IARC: Not listed
Medical Restrictions: No known effects on other illnesses_
9

..St•HSY.>I..'tSl..<'' •%.i}i:e.ii.-.y: f:'..�....'...... r.......-. �.i.��. ..•.........�....-.. _.... .� .. �........... ... ...
Eyes: Flush immediately with water for at least 15 minutes. Consult a physician. If irritation persists.
Skin: Wash material from skin with soap and water.
Ingestion: Give one glass of water or'milk. DO NOT give anything by mouth to an unconscious person: DO
NOT induce vomiting. Get immediate medical attention.
Inhalation: Remove to fresh air. Call a physician if symptoms persist.
Engineering Controls: General ventilation is adequate.
Personal Protection,
Eyes/Face: Safety glasses with side shields and/or face shield should be used when
mixing solutions.
Skin: Corrosion resistant gloves should be used when handling this product.
Respiratory: Not normally required. Wear NIOSH/MSHA approved respirator if conditions warrant.
Handling:. Do not generate dust.
=Storagei Store In a cool dry location.
- ----------------
RCRA Hazardous Waste: As provided, this product does not meet the definition of hazardous waste
.under the US EPA Hazardous Waste Regulations 40CFR 261, However, solutions of this product may be
corrosive hazardous waste - Class D003.
Waste Disposal: ,Solutions should be neutralized before disposal.L�oonsult7W411 local -sanitary sewer.?
f_ -authorities before discharging to-sanitarysewer: DO NOT dispose to the storm sewer. I]ispose_o- Milerly ina
- -
_accordance -with local; state; -and federal regulations y Ay
DOT/UN Hazard Class: Corrosive Class 8
Proper Shipping Name: `Sulfainic_Aeid­. '
)identification Number: UN 2967
TSCA: All components of this product are registered under the' regulations of the Toxic Substances Control Act,
SARA TITLE III: This product does not contain regulated levels of any toxic chemical subject to the
reporting requirements of section 313 of Title III of the Superfund Amendments and Reauthorization Act of
1886 (SARA) and 40 CFR 372.
Prepared By Osmonics Regulatory Affairs Department 612/933-2277
The above information and recommendations are believed accurate and reliable. Because it is
not possible to anticipate all conditions of use, additional safety precautions maybe required.
User Responsibility: Each user should read and understand this information and incorporate
it into individual site. safety programs in accordance with applicable hazard communication
standards and remilations.
P/.N 56049

Memo To:
From:
Prepared By:
Subject:
DIVISION OF ENVIRONMENTAL MANAGEMENT
April 12, 1993
Coleen Sullins .
D. Rex GleasonN/zej7'x
•
Michael L. Parkerv
Request for Approval of Membrane Cleaning Agent
Allen Steam Station
NPDES Permit No. NC0004979
Gaston County
The staff of this Office has conducted a review of the request
dated March 5, 1993 from Ms. Dayna J. Russell, Associate Engineer,
Duke Power Company, to use a product called OSMO AD -20 to clean the
membrane filters on the subject facility's reverse osmosis unit.
Ms. Russell also provided some general information regarding the
product and it's characteristics.
Provided Technical Support concurs, this Office has no
objection to the use of this material for the requested purpose.
If you have any questions, please advise.
MLP

_ DMSION OF ENVIRONMENTAL MANAGEMENT
Water Quality Section/Rapid Assessment Group
February 15, 1993
MEMORANDUM I
TO. Randy Kepler
THROUGH: Carla Sanderso
FROM: ��Dave GoodrichO
SUBJECT: Request for Modification of Six NPDES Permits
Ash Settling Pond Monitoring Reduction
Duke Power Company
This is in response to Duke Power Company's January 19, 1993 letter to Coleen
Sullins. In that correspondence, Dayna Russell, eequestedLdeletion of the -required
monitoringfor oil-and-grease=and-total-.suspended-solids-during rainfall -events. The
specific permits included in consideration for this request are:
-51A�
Allen Steam'Station NC0004979
Buck Steam Station NCO004774 -3c -7
Cliffside Steam Station NC0005088 O 3 0 �'oZ
Dan River Steam Station NC0003468 D 3 o Z D -,;5
Marshall Steam Station NC0004987 p e
Riverbend Steam Station NC0004961 O 30 $ 3
As stated in this letter, the permits allow the permittee to request the elimination of this
monitoring after a one year period in which data are collected. After reviewing the last 12
months of monitoring for all six facilities, it appears that the eliminationof=this-monitoring
requirement -will -not have an adverse impact -on waterquality-and-the-request should -be
granted: This, modification of the above -referenced permits should not:be--construed-as.-the
complete -elimination of monitoring=for-Gil-=and=grease; and-total-siuspended:solids. 'Samples;
for_theseparameters must-st ill_be collecied.twice-per month.' The permittee should also
continue to report the presence of cenospheres found in the samples.
cc: Mike Parker
Ron Linville
Jim Reid