NC0038377_Fact Sheet for Wasteload Allocation_19970221

FACT SHEET FOR WASTELOAD ALLOCATION
Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
- T
I
F�,EFB Z 1 1
DEHNR RALElcjj
REGIONAL Of BICE
Lake
Cooling tower blowdown. This water is usually directly mixed with the ash sluice water.
Occassionally (once per year maximum) it is discharged directly into the ash pond. Heat
exchange water (low volume waste) is almost continuously discharged out of pipe 001.
Approximately once every two years, the cooling towers are drained completely for
maintenance. This discharge goes directly to the Mayo Reservior. The established permit
limits still have to met during this discharge event.
Special Schedule Requirements and additional comments from Reviewers:
Recommended b
_ Farrell Keoughl
Instream Assessment:
Regional Supervisor -
Permits &
RETURN TO TECHNICAL SUPPORT BY:
Date.14 i -cq-
Date: ��//q � �
_ Date: 14 %
_ Date: ,% / q7
Request # 8538
CP & L - Mayo Steam & Electric Generating Plant
NCO038377 2,6611
Industrial - 100 %
Existing
Renewal
Stream Characteristic:
Mayo Reservior
USGS #
C
Date:
03-02-05
Drainage Area (mi2):
Person
Summer 7Q10 (cfs):
Raleigh
Winter 7Q10 (cfs):
Myhra
Average Flow (cfs):
1/14/97
30Q2 (cfs):
A 23 SW
IWC (%):
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
- T
I
F�,EFB Z 1 1
DEHNR RALElcjj
REGIONAL Of BICE
Lake
Cooling tower blowdown. This water is usually directly mixed with the ash sluice water.
Occassionally (once per year maximum) it is discharged directly into the ash pond. Heat
exchange water (low volume waste) is almost continuously discharged out of pipe 001.
Approximately once every two years, the cooling towers are drained completely for
maintenance. This discharge goes directly to the Mayo Reservior. The established permit
limits still have to met during this discharge event.
Special Schedule Requirements and additional comments from Reviewers:
Recommended b
_ Farrell Keoughl
Instream Assessment:
Regional Supervisor -
Permits &
RETURN TO TECHNICAL SUPPORT BY:
Date.14 i -cq-
Date: ��//q � �
_ Date: 14 %
_ Date: ,% / q7

PARAMETERS
Existing Limits:
Monthly
Daily
Measurement
Sample
Monthly
Daily
Measurement
Sample
Wasteflow (mgd):
Average
Maximum
Frequency
Type
Wasteflow (mgd):
200 *
500 *
Daily
Pump Log
Free Available Chlorine (jug/1):
200 *
500 *
Weekly
Grab
Time of Chlorine Addition*
*
2 hours *
Weekly
Logs
Total Chromium (mg/1):
02 **
0.2 **
2 / month
Grab
Total Zinc (mg/1):
10 **
1.0 **
2 / month
Grab
pH (SU).
exclusive of Zinc and
6 - 9
Weekly
Grab
The 126 priority pollutants (40 CFR 423)
exclusive of Zinc and
Chromium **
Effluent sample location after mixing with fly and bottom ash, but
prior to ash pond.
* Neither free available chlorine nor total residual chlorine may be discharged from any sin le enerating umt for
more than two hours per day, unless the permittee demonstrates to the Division of En��lhiriag�
that discharge for more than two hours is required for macrornvertebrate control. The 500 gg/l limitation is an
instantaneous maximum and is to be measured during the chlorine release period. The 200 µg/1 limitation is an
average during the chlorine release period. Simultaneous multi -unit chlorination is permitted
** Limits and monitoring are only applicable if maintenance chemicals containing this parameter are added to the
cooling towers. There shall be no detectable discharge of the 126 Priority Pollutants contained in chemicals
added for cooling tower maintenance, except for chromium and zinc. Compliance with this limitation may be
determined by engineering calculations which demonstrate that the regulated pollutants are not detectable in the
final discharge by methods in 40 CFR 136.
This permit does not authorize a discharge directly to the Mayo Reservoir except during times in which the cooling
tower(s) are drained. The permittee shall notify ther�a,�. �.� " EA.I I. '„� X �' , Raleigh Regional Office,
prior to draining the cooling tower(s), except during non -office hour emergencies when notification must be made the
next working day. The above listed limitations for the pollutants shall apply during the draining of the cooling tower(s).
Sampling shall be conducted during the time of the event at the cooling tower blowdown area. The above listed effluent
characteristics and pH shall be sampled daily while draining the cooling tower(s).
Recommended Limits:
* Neither free available chlorine nor total residual chlorine may be discharged from any single generatin unit for
more than two hours per day, unless the permittee demonstrates to the Division of
that discharge for more than two hours is required for macroinvertebrate control. The 500 gg/l limitation is an
instantaneous maximum and is to be measured during the chlorine release period. The 200 gg/l limitation is an
average during the chlorine release period Simultaneous multi -unit chlorination is permitted
*
Limits and monitoring are only applicable if maintenance chemicals containing this parameter are added to the
cooling towers. There shall be no detectable discharge of the 126 Priority Pollutants contained in chemicals
added for cooling tower maintenance, except for chronuum and zinc. Compliance with this limitation may be
determined by engineering calculations which demonstrate that the regulated pollutants are not detectable in the
final discharge by methods in 40 CFR 136.
This permit does not authorize a discharge directly to the Mayo Re ervoir exce t durin times in which the cooling
tower(s) are drained The permittee shall notify the Division of L��, Raleigh Regional Office,
prior to draining the cooling tower(s), except during non -office hour emergencies when notification must be made the
next working day. The above listed limitations for the pollutants shall apply during the draining of the cooling tower(s).
Sampling shall be conducted during the time of the event at the cooling tower blowdown area. The above listed effluent
characteristics and pH shall be sampled daily while draining the cooling tower(s).
Monthly
Daily
Measurement
Sample
Average
Maximum
Frequency
Type
Wasteflow (mgd):
Daily
Pump Log
Free Available Chlorine (gg/1):
200 *
500 *
Weekly
Grab
Time of Chlorine Addition:
*
2 hours *
Weekly
Logs
Total Chromium (mg/1):
02 **
0.2 **
2 / month
Grab
Total Zinc (mg/1):
10 **
10 **
2 / month
Grab
pH (SIJ)
6 - 9
Weekly
Grab
The 126 priority pollutants (40 CFR 423)
exclusive of Zinc and
Chromium **
Effluent sample location after
mixing with fly and bottom ash, but prior to ash pond.
* Neither free available chlorine nor total residual chlorine may be discharged from any single generatin unit for
more than two hours per day, unless the permittee demonstrates to the Division of
that discharge for more than two hours is required for macroinvertebrate control. The 500 gg/l limitation is an
instantaneous maximum and is to be measured during the chlorine release period. The 200 gg/l limitation is an
average during the chlorine release period Simultaneous multi -unit chlorination is permitted
*
Limits and monitoring are only applicable if maintenance chemicals containing this parameter are added to the
cooling towers. There shall be no detectable discharge of the 126 Priority Pollutants contained in chemicals
added for cooling tower maintenance, except for chronuum and zinc. Compliance with this limitation may be
determined by engineering calculations which demonstrate that the regulated pollutants are not detectable in the
final discharge by methods in 40 CFR 136.
This permit does not authorize a discharge directly to the Mayo Re ervoir exce t durin times in which the cooling
tower(s) are drained The permittee shall notify the Division of L��, Raleigh Regional Office,
prior to draining the cooling tower(s), except during non -office hour emergencies when notification must be made the
next working day. The above listed limitations for the pollutants shall apply during the draining of the cooling tower(s).
Sampling shall be conducted during the time of the event at the cooling tower blowdown area. The above listed effluent
characteristics and pH shall be sampled daily while draining the cooling tower(s).

INSTREAM MONITORING REQUIREMENTS
Upstream Location: not required
Downstream Location: not required
Parameters:
A-�-6 C
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional office
recommendations:
If no, why not?
Special Instructions or Conditions
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basmwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

Facility Name:
CP & L Myao Steam Electric Plant
NPDES No.:
NC0038377
Type of Waste:
0.2 % Domestic 99.8%
0 % Domestic 100%
Facility Status:
Existing
Permit Status:
Renewal
Receiving Stream:
Mayo Reservior
Stream Classification:
C
Subbasin:
03-02-05
County:
Person
Regional Office:
Raleigh
Requestor:
Myhra
Date of Request:
1 / 14 / 97
TopoQuad:
A 23 SW
Request # 8538
8539
Industrial 002
Industrial 001
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs): Reservior
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
1982: looks as if plant had not yet been completed. Facility did receive permit for domestic waste treated to Secondary
levels.
1987: WLA performed with limits for various pipes. some type of model, (Toxicant Screening Model) was used to develop Se
limits - not explained in notes and I am not familiar with model. extensive letter from facility requesting changes to Draft
permit.
1991: notes indicate that EPA objected to previous Draft permit and the issues had not been settled, therefore facility had been
operating without a permit since 1987, (EPA's reasons for objecting not outlined). WLA was for combination of pipe 003
(domestic) to the ash pond, (pipe 002). Recommendations included BOD, TRC, and fecal coliform limits. These were
dropped after consideration of dilution involved in this effluent.
Metals
refer attached 'Reasonable Potential' spreadsheet
even with a conservative estimate of 1:2 dilution, monitoring would be recommended...
Crutchfield Branch
This tributary used to have its head at the location of the Ash Basin (refer attached map). Because of this, it was suspected
that the clay berm which creates the dam for this ash basin may be leaking into this waterbody. Therefore, a requirement to
do quarterly monitoring of this waterbody was required in the permit, (Part III, Section F). Below is the data from the beginning
of 1995 to the present. The December 6, 1995 data does not fit with the rest of the data, so I called the company to see what
they knew about it. They determined that this was the time when they were switching from their own labs to an outside
contractor.
Total Total Total
Date Copper Arsenic Selenium Comments
June 3, 1996 < 1 1 < 5
March 4, 1996 < 1 < 1 < 1 arsenic previously given in mg/l,
now looks to pg/I
December 6, 1995 99 26 < 1 Iron 3,400 µg/I - facility belives this to be an
anomaly, probably lab error as they were
switching labs at that time.
July 10, 1995 < 20 < 1 < 1 Iron 2,000 pg/I
April 27, 1995 < 20 < 1 < 1 Iron 2,500 pg/I
January 12, 1995 < 20 < 1 < 1 Iron 3,600 pg/I
NOTE: every DMR has
"Vanadium was not monitored since the unit was not primarily oil fired"
old permit, (1988 - 1996) had a clause which stipulated that this must be monitored
every quarter. It was unknown by facility why this parameter was to be monitored.
NOTE: Part III, Section E. of permit rp—irac a gP1Pni1,m cturiv
NOTE: Part III, Section H. of permit I
Ricky Miller (919) 362 - 3566
JpgMte Q.Gpp1c, 36Z-3355

Various questions about WLA
• pipes 001 and 002 have similar recommended guidelines
Notes from engineer and my handwritten notes commented that it is unnecessary to monitor the same things
at two different locations For pipe 001, Oil & Grease and TSS are not limited as they will receive a limit at
the end of pipe 002, (which discharges to reservoi) Pipe 001 does have limits for both chromium, zinc, and
chlorine. This should prevent violations at the end of the pipe 002 as the chlorine should volatilize and the
zinc and chromium should bind and settle in the ash basin.
• why does the domestic discharge not have limits or monitoring requirements ?
Part III, Section H of the permit requires that the domestic wastewater treatment plant be "properly operated
and maintained to ensure treatment of domestic wastewater to secondary levels." Yet no monitoring of the
effluent is required to verify that this is in fact taking place
After talking with Juan Mangles, (Modeler II who reviewed permit during last renewal) the domestic portion of
the wastestream is approximated to be 0.2 % IWC, it is connected into the drainage system, (difficult to
access), and it is not necessary to monitor, thereby depending that the operator is fulfilling this requirement
due to its small influence upon the wastestream
pipe 002 seems to have previously had limits for copper and iron; why not now'?
After talking with engineer, he pointed out that regulations require this monitoring when metal cleaning
waste is discharged - it is not discharged at this facility I didn't understand this, so I called the facility and it
was explained to me that these plants built retention ponds for this waste because they assumed air quality
would not allow them to evaporate this wastewater It turned out that it was okay for them to run this
wastewater through the system and evaporate it off, (hence no discharge) Initially, hypochloric acid was
used to run through the unit to rid it of calcium and other deposits, now they use a citric acid product.
NC003g3-4"+