NC0038377_Review of Draft Permit_20051110

November 10, 2005
MEMORANDUM
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
To: Michael Douglas
NC DENR / D H / Regional Engineer
Raleigh Regional Office
-
From Sergei Chernikov
NPDES Unit
w
�Q
Subject: Review of Draft NPDES Permit NCO038377
Mayo Steam Electric Generating Plant
Please indicate below your agency's position or viewpoint on the draft permit and return this form by
December 10, 2005. If you have any questions on the draft permit, please contact me at telephone number
[phone], extension 594 or via e-mail at [e-mail].
RESPONSE- (Check one)
Concur with the issuance of this permit provided the facility is operated and maintained properly, the stated
effluent limits are met prior to discharge, and the discharge does not contravene the designated water quality
standards.
❑ Concurs with issuance of the above permit, provided the following conditions are met:
F-1
Opposes the issuance of the above permit, based on reasons stated below, or attached:
1617 MAIL SERVICE CENTER, RALEIGH, NORTH CAROLINA 27699-1617 - TELEPHONE [phone]/FAX [phone]
VISIT us ON THE WEB AT http://h2o.enr.state.nc.us/NPDES

neap //sergei chemikov%40dwq.denr.ncmail net@cros ncmail net.143/f
Subject: Draft Permit reviews (3)
From: John Giorgino <[e-mail]>
Date: Thu, 10 Nov 2005 10:59:14 -0500
To: sergei chemikov <[e-mail]>
Sergei, I reviewed the following:
NC0004944 INVISTA S.a.r.l. - no comments
NCO038377 Mayo - no comments
NCO021717 Wilkesboro WWTP - the cover page lists the facility as Cub Creek WWTP.
Should the name be changed to Wilkesboro WWTP?
Thanks for forwarding them.
-John
John Giorgino
Environmental Biologist
North Carolina Division of Water Quality
Environmental Sciences Section
Aquatic Toxicology Unit
Mailing Address:
1621 MSC
Raleigh, NC 27699-1621
Office: 919 733-2136
Fax: [phone]
Email: [e-mail]
Web Page: http://www.esb.enr.state.nc.us
1 of 1 11/10/2005 11:19 AT

STATE OF NORTH CAROLINA,
PERSON COUNTY
PRINTER'S AFFIDAVIT
� 1Cq_ j , CdA V" , being duly sworn,
deposes and says That he/she is Ulu I run of
The Courier -Times, with Its principle place of business
located in the city of Roxboro, County of Person, State
of North Carolina, that the foregoing or attached
newspaper notice was published In The Courier -Times,
once a week for I successive weeks, beginning with
its issue of H4hday of = CiDk J1 , 20_(:6
and ending with its issue of �� day of
C1U 20 l that The Courier -Times, is
the sole owner and publisher of said newspaper,
The Courier -Times
(Affiant)
Sworn to and subscribed before me,
this the 3rd day of I 1 4'Yly 1 20 (60�
LA\1 U j �-, Notary Public)
My commission expires theReday of 200q
(Publication Fee $
(Notarial Sea[)
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 application of NC General
Statute 143 21, Public law 92-500 and
otherlawful standards and regulations,
the North Carolina Environmental
Management Commission proposes
to issue a National Pollutant Discharge
Elimination System (NPDES)
wastewater discharge permitpto the
person(s) _listed below effective 45
^days from the' ybhsh-d2te of thts:
notice �`
Progress Energy, 10660 Boston
Road, Roxboro, NC 27574 has applied
for renewal of its NPDES discharge
permit for Mayo Electric Generating
Plant (number NC0038377)
discharging to the Mayo Reservoir in
the Roanoke River Basin This facility
operates two outfalls, 002 (coling tower
blowdown, coal pile runoff, stormwater
runoff, ash sluice water, treated
domestic wastewater, and low volume
wastes), 001 (cooling tower system,
discharge is less than once per year)
Currently oil and grease, selenium,
and TSS are water quaility limited
This discharge may affect future
allocations in this portion of the
Roanoke River Basin
, Written comments regarding the
proposed permit will be accepted until
30 days after the publish date of this
notice All comments received prior to
that date are considered in the final
determinations regarding the
proposed permit The Director of the
NC Division of. Water Quality may
decide to hold a public meeting for the
propospd permit should the Division
receive a,significant degree of public
interest , I
Copies of the draft permit and
other supporting information, on file
used to determine conditions'present
in the draft permit are available upon
request and payment of the costs of
reproduction. Mail comments and/or
requests for information to the NC
Division of Water Quality at the above
address or call the Point Source
Branch at [phone], extension
520 o r363. Please include the NPDES
permit number in any communication
Interested persons may also visit the
Division of Water Quality at 512 N
Salisbury Street, Raleigh, NC 27604-
1148 between the hours of 8 00 a m
and 5 00 p m to review information
on file
Oct 19

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0038377, Progress Energy Carolinas, Inc
Mayo Steam Electric Generating Plant
SUMMARY
The Mayo Electric Generating Plant is a coal-fired electric generating plant with one
unit rated at a maximum dependable capacity of 745 mw. Vater for plant uses is
withdrawn from the Mayo Reservoir as required to make up evaporative losses from
the cooling tower, boiler water and drinking water needs. This facility is subject, to
EPA effluent guideline limits per 40 CFR 423- Steam Electric Power Generating Point
Source Category. The facility isnot subject to the 316(b) Phase II regulations since it
is a closed cycle cooling system and has a design flow of less than, 50 MGD.
The facility operates the following outfalls:
• Outfall 001 — Cooling tower system. This system is drained for maintenance
approximately once a year to the reservoir. The discharge is monitored and
reported on the DMRs.
• Outfall 002 - Ash pond treatment system (including low volume waste, ash
sluice water, cooling tower blowdown, coal pile runoff, etc. Cooling tower
blowdown is usually mixed with bottom and fly ash prior to discharging into
the ash, pond.
• Outfalls 004, 005, and 006a, b, c, d, e - stormwater outfalls.
TOXICITY TESTING:
Current Requirement: Acute P/F at 90%, February, May, August, November.
Proposed Requirement: Acute P/F at 90%, February, May, August, November.
Facility Information
Applicant/ Facility Name:
Progress Energy Carolinas/Mayo Steam Electric Generating Plant
Applicant Address:
10660 Boston Road, Roxboro, NC 27573
Facility Address:
(same)
Permitted Flow
Not limited
Type of Waste.
99 8 % Industrial, 0 2% - domestic,
Facile /Pernut Status:
Existing/ Renewal
County.
Person
Miscellaneous
Receiving Stream
Mayo Reservoir
Regional Office:
RRO
Stream Classification.
C
Quad
A23SW
303(d) Listed9-
No
Permit Writer-
Sergei Chernikov
Subbasin:
030205
(Roanoke)
Date
September 15, 2005
Drainage Area (mm2).
Lake
r
a� .
a��
-
C.dYW9A
Summer 7Q'10 (cfs)
30Q2 (cfs)'
Average Flow (cfs):-
IWC (%).
Primary SIC Code -
SUMMARY
The Mayo Electric Generating Plant is a coal-fired electric generating plant with one
unit rated at a maximum dependable capacity of 745 mw. Vater for plant uses is
withdrawn from the Mayo Reservoir as required to make up evaporative losses from
the cooling tower, boiler water and drinking water needs. This facility is subject, to
EPA effluent guideline limits per 40 CFR 423- Steam Electric Power Generating Point
Source Category. The facility isnot subject to the 316(b) Phase II regulations since it
is a closed cycle cooling system and has a design flow of less than, 50 MGD.
The facility operates the following outfalls:
• Outfall 001 — Cooling tower system. This system is drained for maintenance
approximately once a year to the reservoir. The discharge is monitored and
reported on the DMRs.
• Outfall 002 - Ash pond treatment system (including low volume waste, ash
sluice water, cooling tower blowdown, coal pile runoff, etc. Cooling tower
blowdown is usually mixed with bottom and fly ash prior to discharging into
the ash, pond.
• Outfalls 004, 005, and 006a, b, c, d, e - stormwater outfalls.
TOXICITY TESTING:
Current Requirement: Acute P/F at 90%, February, May, August, November.
Proposed Requirement: Acute P/F at 90%, February, May, August, November.

NPDES PERMIT FACT SHEET
Page 2
Progress- Asheville
NPDES No. NC0000396
The facility has passed all chronic toxicity tests during the previous 4.5 years.
COMPLIANCE SUMMARY: BASED ON THE PREVIOUS 5 YEARS
There are no outstanding and/or chronic compliance problems related to the NPDES
permit. A compliance evaluation inspection conducted on 03/31/05 found that
facility is in compliance. The only Notice of Violation that was issued during previous
5 years was for -,TRC (10/13/2003). Letter from Environmental Sciences Branch
(05/09/05) concurred with the latest report from Progress that chemical and
biological characteristics of Mayo reservoir are similar to prior years.
REASONABLE POTENTIAL ANALISYS
Reasonable potential analyses were conducted for arsenic and selenium. No riew
limits are recommended. Arsenic monitoring in fish tissue is added to the permit
based on the results of reasonable potential analysis (Condition A.(II).). A special
study must be conducted on selenium yearly (Condition A.(6).).
PROPOSED CHANGES
Monitoring Frequencies: The monitoring frequency for Oil and Grease and Total
Suspended Solids have been reduced to Monthly based on DMR data and as a
response to the permittee's request. Analytical monitoring requirements for
stormwater have been eliminated based on DMR data and as a response to the i
permittee's request.,The following statement has been added to the effluent
limitations page for, Outfall 001 in response to the permittee's request: "Monitoring for
total residual chlorine is required only if chlorine -based compound is added to the
system". 1 1,
,
Limits: No changes are proposed.
Misc: In response to the permittee request, an internal outfall 007 was created
to monitor the influent to the ash pond from the cooling tower system, which consists
mostly of cooling tower blowdown. An external outfall 001 is designated for an
infrequent drainage of the cooling tower system directly to the Mayo reservoir. Such
drainage is usually conducted once a year for repairs and maintenance of cooling
towers. Permit expiration date was changed to 03/31/2007 to be consistent with
basinwide schedule.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice: 10/12/05 (est.)
Permit Scheduled to Issue: 12/12/05 (est.)
STATE CONTACT
If you have any questions on any of the above information or on the attached permit,
please contact Sergei Chernikov at [phone], extension 594.

NPDES PERMIT FACT SHEET
Page 3
REGIONAL OFFICE COMMENTS:
Progress- Asheville
NPDES No. NC0000396
Name: Date:
EPA COMMENTS:
Name: Date:

REASONABLE POTENTIAL ANALYSIS
Mayo Steam Electric Plant
< NCO038377
Time Period 2001-2005
Qw (MGD)
7.3
7Q10S (cfs)
0
7Q10W (cfs)
0
30Q2 (cfs)
0
Avg Stream Flow, QA (cfs)
0
Rec'ving Stream Mayo
reservoir
WWTP Class < WWTP Class >
IWC (%) @ 7Q10S
100
@ 7Q10W
100
@ 30Q2
100
@ QA
100
Stream Class C
PQL
Outfall 001
Qw=7.3MGD
'Legend
C = Carcinogenic
NC = Non -carcinogenic
A =Aesthetic
&'-
n, J
"(il
Freshwater Discharge k �ti�d(i 1 1' A_�
38377 -RPA -2005, rpa
9129/2005
STANDARDS &
PARAMETER
TYPE
CRITERIA (2)
PQL
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
tl)
NC WQs / 3i FAV /
Chronic Acute
n p Det Max Pred Cw Allowable Cw
Acute N/A
Arsenic
NC
50
ug/_
17 17
5346
_ _ _ _
Chronic 50
Z
Acute 56
Selenium
NC
50 56
ug,L
37 37
152
�%___-/
_ _ _ _ _
Chron 5 0
'Legend
C = Carcinogenic
NC = Non -carcinogenic
A =Aesthetic
&'-
n, J
"(il
Freshwater Discharge k �ti�d(i 1 1' A_�
38377 -RPA -2005, rpa
9129/2005

REASONABLE POTENTIAL ANALYSIS
38377 -RPA -2005, data
1 ' 9/29/2005
Arsenic
Date Data
BDL=1/2DL
Results
1
640
640
Std Dev
41 4365
2
1930
1930
Mean
591176
3
1050
1050
C V
07009
4
680
680
n
17
5
80
80
6
130
130
Mult Factor =
27700
7
350
350
Max Value
193 0 ug/L
8
310
310
Max Pred Cw
534 6 ug/L
9
420
420
10
600
600
11
660
660
12
450
450
13
450
450
14
560
560
15
620
620
16
410
410
17
710
71 0
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
199
200
38377 -RPA -2005, data
1 ' 9/29/2005

REASONABLE POTENTIAL ANALYSIS
38377 -RPA -2005, data
-2- 9/29/2005
Selenium
Date Data
BDL=1/2DL
Results
1
499
50
Std Dev
15437
2
5
50
Mean
40516
3
6
60
CV
03810
4
5
50
n
37
5
399
40
6
299
30
Mult Factor =
15200
7
499
50
Max Value
10 0 ug/L
8
399
40
Max Fred Cw
15 2 ug/L
9
300
30
10
300
30
11
299
30
12
299
30
13
199
20
14
399
40
15
400
40
16
201
20
17
1000
100
18
201
20
19
201
20
20
201
20
21
201
20
22
399
40
23
300
30
24
399
40
25
400
40
26
600
60
27
500
50
28
501
50
29
500
50
30
399
40
31
500
50
32
400
40
33
400
40
34
600
60
35
399
40
36
399
40
37
399
40
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
199
200
38377 -RPA -2005, data
-2- 9/29/2005