NC0036269_Approval_20151230

PAT MCCRORY
Governor -
DONALD R. VAN DER VAART
Water Resources
ENVIRONMENTAL QUALITY
December 30, 2015
Mr. T. Mark Fowler, Director
Water and Sewer Authority of Cabarrus County
P.O. Box 428
Concord, North Carolina 28026-0428
Subject: NPDES Permit Notification/Effluent Sheet A (2) Activation
Permit NC0036269
Rocky River Regional WWTP
Cabarrus County
Class 4 Facility
Dear Mr. Fowler:
Secretary
S. JAY ZIMMERMAN
Director
Based on the reported Monthly Average effluent flow of 21.9 MGD for November 2015 for the subject
facility, the Division is notifying you that Effluent Limitations and Monitoring Requirements will
transition to the phased Effluent Sheet A (2) with a Monthly Average flow limit of 26.5 MGD, effective
February 1, 2016. If you have any questions on this transition, feel free to contact me at 919-807-6390 or
via email at [e-mail].
Sincerely,
S. Jay Zimmerman, P.G.
Director, Division of Water Resources
Cc: NPDES File
Central File
DWR/Mooresville Regional Office, Water Quality
Ec: EPA Region 4
DWR/Aquatic Toxicology
State of North Carolina I Environmental Quality 1 Water Resources
1617 Mail Service Center I Raleigh, North Carolina 27699-1617
919 707 9000

NC3t2- IA \S1-CC I2/14Th
Belnick, Tom
From: Belnick, Tom
Sent: Tuesday, December 08, 2015 3:52 PM
To: 'Struve, James N.'
Cc: Thomas Hahn ([e-mail]); Rodriguez, Teresa ([e-mail]); Bell,
Wes
Subject: RE: WSACC Rocky River Regional WWTP - Rerating Study
Attachments: NC0036269 WSACC.pdf
Jim- sorry for delay, still playing catchup here. Please note that the transition language from 24 to 26.5 MGD came
directly from WSACC/Van Rowell (see attachment, 2pages). It would be difficult to make a change now and justify that
to EPA and potential third parties. I would recommend that WSACC submit a request for Monitoring Frequency
Reduction with updated data in accordance with Exceptionally Performing Facilities guidance in 2016.
If you would still like to discuss, I am currently interviewing for vacant positions this week, but would be available after
"3:30pm on Wed/Thurs.
Tom Belnick
Supervisor
NPDES Complex Permitting Unit, DWR
North Carolina Department of Environmental Quality
919-807-6390 office
[e-mail]
512 North Salisbury Street
1617 Mail Service Center
Raleigh, NC 27669
I�Iothin� Compares.. .
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
Nov ZOrs
- v flow = zI.9 M&
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From: Struve, James N. [mailto:[e-mail]]
Sent: Thursday, December 03, 2015 4:59 PM
To: Belnick, Tom <[e-mail]>
Cc: Thomas Hahn ([e-mail]) <[e-mail]>; Struve, James N. <[e-mail]>; Berry,
Ron <[e-mail]>
Subject: WSACC Rocky River Regional WWTP - Rerating Study
Hi Tom.
I am sending this email on behalf of Thomas Hahn with the Water and Sewer Authority of Cabarrus County (WSACC) to
request a short teleconference call on either the afternoon (after 2:00 pm) of Dec 7th or Dec 8th.

As you may recall, Hazen performed a rerating study at the Rocky River Regional WWTP (NPDES Permit No. NC0036263)
in July of 2011 in which the plant was rerated from 24 to 26.5 mgd. A letter was prepared by the NPDES Permitting Unit
(refer to attached) that approved the rerating study and established a flow trigger (21.6 mgd max month flow) when the
limits would change from 24 mgd to 26.5 mgd.
During the months of October and November, the Rocky River Regional WWTP received above average rainfall to the
extent that the average month flow for November was 21.9 mgd. However, the annual average flow to date to the plant
is only 16.4 mgd.
WSACC would like to discuss if the flow trigger could be increased so that limits remain at the 24 mgd flow condition.
I have discussed this with both Ken Pohlig and Ron Berry, and WSACC has had discussions with the Mooresville Regional
Office.
Ron did indicate that a change would require a major permit modification and that the effluent limits would have to
remain at the 26.5 mgd flow condition due to EPA anti -backsliding regulations. However, I believe there are some
additional monitoring requirements that WSACC would like relief from if at all possible.
Please let me know if you are available to teleconference on either Dec 7th or 8th after 2:00 pm.
Thanks,
Jim
James N. Struve, PE
Vice President 1 Hazen and Sawyer
Charlotte Operations Manager
4944 Parkway Plaza Blvd, Ste. 375, Charlotte NC 28217
704 357-3150 (main) 1 704 941-6046 (direct) 1 704 650-6309 (cell)
[e-mail] 1 hazenandsawyer.com

/VSA
WATER & SEWER AUTHORITY
OF CABARRUS COUNTY
June 4, 2010
Mr. Tom Belnick
Supervisor, NPDES Point Source Branch
Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 28001
•
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DEPlE; = 0T1=Vg�J-IlY .
We ands trey E —1.''
Office: 232 Davidson Hwy.
Concord, NC28027
Mail to: P.O. Box 428
Concord, NC 28026-0428
Phone: [phone]
Fax: [phone]
SUBJECT: "Effluent Limitations" for 26.5 mgd Plant Re -rating - Water & Sewer Authority
of Cabarrus County (WSACC) - NPDES Permit No. NC 0036269
Dear Mr. Belnick:
I am writing this letter in reference to recent discussions with you concerning the implementation
of the "effluent limitations" that were established for a re -rating of our Rocky River Regional
WWTP from 24.0 mgd to 26.5 mgd as outlined in your letter of 3/16/10.
Our review of the 26.5 mgd effluent limitations information that was provided indicated that
these limitations would become effective upon formal approval by DWQ Construction Grants
and Loans of the re -rating report/technical documentation. Although not provided for, it was our
understanding that the 26.5 mgd effluent limitations would be phased in, and the current 24.0
mgd effluent limitations would remain effective for a given period of time based on the current
permitted flow of 24.0 mgd. You stated that this would need to be requested, but felt that this
could be drafted into the modified permit.
Therefore, it is requested that the 26.5 mgd effluent limitations become effective when the plant
effluent flow equals 21.6 mgd on a maximum month basis, which represents 90% of the current
24.0 mgd permitted flow.
If you need any additional information relative to this request, please let me know. Your help
and assistance in regard this re -rating effort is greatly appreciated.
Sincerely,
Evander H. Rowell, P.E.
Engineering Director
EHR:jss
cc: Ray Furr
Jim Struve — Hazen & Sawyer
Mike Parker — DWQ/Mooresville

t•
Belnick, Tom
From: Belnick, Tom
Sent: Friday, October 07, 2011 4:41•PM
To: 'Van Rowell'
Cc: Parker, Michael
Subject: • NPDES 26.5 MGD Sheet
Hi Van -just received a copy of your Eng. Cert..for the ATC/Rerate to 26.5 MGD. DWQ does not -automatically track when
the facility flow exceeds 21.6 MGD on a max month basis (which triggers shift to Effluent Sheet A(2), so please inform
DWQ NPDES when this occurs so that we can activate your Effluent Sheet A(2) for 26.5 MGD flow. Thanks.
Tom Belnick
Supervisor, Complex NPDES Permitting Unit
NC DENR/Division of Water Quality
1617 Mail Service Center, Raleigh, NC 27699-1617
[phone]; fax [phone]
E-mail correspondence to and from this address is subject to the North Carolina Public Records Law and may be
disclosed to third parties unless the content is exempt by statute or other regulation.
1

Denard, Derek
From: Bell, Wes
Sent: Monday, November 30, 2015 4:48 PM
To: Sledge, Bob; Denard, Derek
Subject: FW: Permit # NC0036269
This was Teresa's response to WSACC's inquiry about the flow limit.
Wes
From: Rodriguez, Teresa
Sent: Monday, November 30, 2015 3:31 PM
To: Ritchie, John <[e-mail]>
Cc: Bell, Wes <[e-mail]>
Subject: RE: Permit # NC0036269
John, as the permit is written when the monthly average goes above 21.6 MGD it triggers the next flow tier. With the
November report you should notify the region and the central office so that we can make the change in BIMS.
Teresa
From: Ritchie, John [mailto:[e-mail]]
Sent: Monday, November 30, 2015 12:23 PM
To: Rodriguez, Teresa <[e-mail]>
Cc: Bell, Wes <[e-mail]>
Subject: Permit # NC0036269
Teresa,
My name is John Ritchie, I'm the Wastewater Operations Manager for the Water & Sewer Authority of Cabarrus County
(WSACC).
I have a question in regard to our NPDES permit NC0036269, A. (2) EFFLUENT LIMITATIONS AND MONITORING
REQUIREMENTS [26.5]
I understand the verbiage specifies a limits change when > 21.6 MGD flow is reached and it appears we will exceed that
for November, as we currently are at 21.9 MGD for the month. I wanted to verify with you if the 21.6 MGD is a (1) time
maximum monthly average or if there is any additional guidance you may provide. I have also provided the previous (2)
years of flow data indicating that we have remained well below 21.9 MGD until the highest rainfall to date for November
occurred.
I have attached the rainfall/monthly flow spreadsheet for your review. Please note the November 2015 rainfall & Flow
are based on 11/29/2015 and will change slightly.
I really appreciate any input and guidance you may provide.
Thanks,
row,
Wastewater Operations Manager
Water & Sewer Authority of Cabarrus County
6400 Breezy Ln
Concord, NC 28025
1

Denard, Derek
From: Bell, Wes
Sent: Monday, November 30, 2015 4:47 PM
To: Sledge, Bob; Denard, Derek
Subject: FW: Permit # NC0036269
Attachments: 2014-2015rainDATA.xlsx; wSACC Permit Pages-11302015.pdf
Hope both of you had a Happy Thanksgiving. Please review the below email regarding the WSACC Rocky River
WWTP. As you can see in their attachment of previous monthly average flows, they have been consistently below the
21.6 MGD flow tier limit in their permit; however, they will be above this average for November due to the above
normal rainfall events. Also take a look at the attached permit cover letter page and the actual limitation page and let
me know what you think....should they go to the next flow tier due to one monthly average flow being above 21.6 MGD,
or should this be based on multiple months? Teresa R. seems to think it only takes a single month.
Thanks for any help in this.
Wes
From: Ritchie, John [mailto:[e-mail]]
Sent: Monday, November 30, 2015 12:23 PM
To: Rodriguez, Teresa <[e-mail]>
Cc: Bell, Wes <[e-mail]>
Subject: Permit # NC0036269
Teresa,
My name is John Ritchie, I'm the Wastewater Operations Manager for the Water & Sewer Authority of Cabarrus County
(WSACC).
I have a question in regard to our NPDES permit NC0036269, A. (2) EFFLUENT LIMITATIONS AND MONITORING
REQUIREMENTS [26.5]
I understand the verbiage specifies a limits change when > 21.6 MGD flow is reached and it appears we will exceed that
for November, as we currently are at 21.9 MGD for the month. I wanted to verify with you if the 21.6 MGD is a (1) time
maximum monthly average or if there is any additional guidance you may provide. I have also provided the previous (2)
years of flow data indicating that we have remained well below 21.9 MGD until the highest rainfall to date for November
occurred
I have attached the rainfall/monthly flow spreadsheet for your review. Please note the November 2015 rainfall & Flow
are based on 11/29/2015 and will change slightly.
I really appreciate any input and guidance you may provide.
Thanks,
yokri. a6&
Wastewater Operations Manager
Water & Sewer Authority of Cabarrus County
6400 Breezy Ln
Concord, NC 28025
Phone: [phone] ext. 114
Fax: [phone]
Cell: 704-710-1787
1

Water and Sewer Authority of Cabarrus County
2015 Daily Rain Report
•
(Date)
January
February
March
April
May
June
July
. August
Sept
October
November
December
1
0.00
0.00
0.05
0.00
0.00
0.00
0.00
0.00
0.00
0.09
2
0.00
0.37
0.19
0.00
0.00
0.70
0.00
0.00
0.00
1.71
3
0.18
0.00
0.00
0.10
0.00
1.05
0.00
0.00
0.00
2.96
4
0.1.7
0.00
0.03
0.00
0.00
0.00
0.20
0.00
0.00
0.25
5
0.22
0.00
0.05
0.00
0.00
0.00
0.10
0.00
0.65
0.01
6
0.00
0.00
0.61
0.00
0.00
0.00
0.04
0.00
0.00
0.02
7
0.00
0.00
0.00
0.11
0.00
0.02
0.00
0.03
0.00
0.00
8
0.00
0.00
0.00
0.06
0.00
0.00
0.00
0.00
0.00
0.00
9
0.00
0.00
0.00
0.00
0.00
0.40
0.41
0.00
0.00
0.00
10
0.00
0.78
0.00
0.00
0.14
0.00
0.00
0.00
0.21
0.32
11
0.00
0.00
0.00
0.00
0.13
0.00
0.00
0.75
0.11
0,99
12
0.80
0.00
0.06
0.00
0.00
0.07
0.00
0.02
0.01
0.01
13
0.05
0.00 '
0.00
0.00
0.00
0.00
0.00
0.00
0.05
0.00
14
0.02
0.00 .
0.23
0.04
0.00
0.00
0.60
0.00
0.00
0.00
15
0.00
0.00 `
0.23
0.19
0.00
0.00
0.01
0.00
0.00
0.00
16
0.00
0.00
0.00
1.26
0.00
0.00
0.00
0.07
0.00
0.00
17
0.00
0.68
0.00
0.26
0.00
0.00
0.00
0.00
0.00
0.00
18
0.08
0.00
0.00
0.03
0.00
0.00
0.00
0.01
0.00
0.00
19
0.00
0.00
0.00
0.29
0.04
0.03
0.00
1.25
0.00
0.00
20
0.00
0.00
0.31
1.16
0.00
0.02
0.02
1.75
0.00
0.00
21
0.00
0.00
0.00
0.25
0.00
0.00
0.03
0.01
0.00
0.00
22
0.00
0.18
0.00
0.00
0.00
0.00
0.35
0.00
0.78
0.00
23
0.00
0.00
0.03
0.00
0.00
0.61
0.00
0.01
0.00
0.00
24
1.10
0.02
0.00
0.00
0.00
0.00
1.42
0.01
0.00
0.00
25
0.03
0.02
0.00
0.00
0.00
0.00
0.00
0.00
0.53
0.00
26
0.03
0.93
0.07
0.26
0.00
0.00
0.00
0.00
0.51
0.00
27
0.00
0.00
0.03
0.01
0.14
0.03
0.00
0.00
0.42
0.09
28
0.00
0.00
0.16
. 0.00
0.00
0.40
0.94
0.00
0.17
1.20
29
0.00
0.00
0.00
0.00
0.00
0.13
0.00
0.14
0.05
30
0.03
0.05
0.00
0.00
0.00
0.00
0.00
0.14
0.00
TO DATE
31
0.00
0.22
0.00
0.00
0.10
0.00
>9.0
Totals
2.71
2.98
2.32
4.02
0.45
3.33
4.25
4.01
3.72
7.70
0.00
0.00
FLOW MGD
18.59
17.07
17.00
17.33
14.59
14.28
14.51
14.29
14.00
16.83
21.91
Rain Gauge is located at - 464 Harris Street, Concord - at the corner of Harris and McGill

Water and Sewer Authority of Cabarrus County
2014 Daily Rain Report
(Date)
January
February
March
April
May
June
• July
August
Sept
October
November
December
1
0.00
0.00
0.00
0.00
0.00
0.01
0.00
1.50
0.00
0.00
0.85
0.00
2
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.47
0.00
0.00
0.07
0.00
3
0.22
0.04
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.02
4
.0.00
0.07
0.23
0.00
0.00
- 0.00
0.00
0.00
1.32
0.00
0.00
0.00
5
0.07
0.27
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
6
0.13
0.03
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.10
7
0.00
0.00
1.99
0.64
0.00
0.00
0.00
0.00
0.00
0.00
0.04
0.08
8
0.00
0.00
0.40
1.15
0.00
0.00
0.00
0.00
0.26
0.00
0.00
0.00
9
0.00
0.00
0.00
0.00
0.00
0.42
0.00
0.01
0.01
0.00
0.00
0.18
10
0.17
0.00
0.00
0.00
0.18
0.00
0.16
0.10
0.00
0.00
0.00
0.00
11
1.00
0.05
0.00
0.00
0.72
0.26
0.01
0.03
0.00
0.00
0.00
0.00
12
0.67
0.07
0.00
0.00
0.00
1.04
0.00
0.56
0.63
0.03
0.00
0.00
13
0.00
1.20
0.17
0.00
0.00
0.00
0.00
0.41
0.52
0.07
0.00
0.00
14
0.12
0.43
0.00
0.00
0.00
0.04
0.00
0.00
0.00
0.01
0.00
0.00
15
0.07
0:15
0.00
0.56
0.38
0.00
0.00
0.00
0.01
0.79
0.00
0.00
16
0.03
0.00
0.00
0.76
1.63
0.00
1.18
0.00
0.01
0.00.
0.00
0.01
17
0.00
0.00
1.14
0.00
0.00
0.00
0.00
0.00
1.27
0.00
0.16
0.08
18
0.00
0.00
0.63
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.54
0.00
19
0.00
0.73
0.07
1.38
0.00
0.07
0.05
0.00
0.17
0.00
0.00
0.00
20
0.00
0.00
0.00
0.58
0.00
0.00
0.27
0.00
0.40
0.00
0.00
0.00
21
0.00
0.00
0.00
0.00
0.00
0.00
0.02
0.00
0.00
0.00
0.00
0.00
22
0.00
0.22
0.00
0.00
0.00
0.00
0.48
0.00
0.00
0.00
0.00
0.18
23
0.00
0.00
0.00
0.00
0.00
0.00
0.14
0.47
0.00
0.00
0.06
0.16
24
0.00
0.00
0.12
0.00
0.01
0.00
0.00
0.00
0.05
0.00
1.06
1.04
25
0.00
0.00
0.00.
0.00
0.00
0.01
0.77
0.00
0.39
0.00
0.00
0.32
26
0.00
0.00*
0.18
0.07
0.00
0.14
0.00
0.00
0.00
0.00
0.99
0.00
27
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.26
0.00
28
0.00
0.00
0.00
0.03
0.00
0.00
0.49
0.00
0.00
0.00
0.00
0.02
29 .
0.10
0.21
0.00
0.00
0.14
0.00
0.00 •
0.00
0.00
0.00
0.60
30
0.00
0.12
0.35
2.18
0.00
0.00
0.00
0.15
0.00
0.00
0.12
31
0.00
0.00
0.22
0.00
0.00
0.00
0.00
Totals
2.58
3.26
5.26
5.52
5.32
2.13
3.57
3.55
5.19
0.90
4.03
2.91
FLOW MGD
18.18
17.56
19.66
18.92
"15.76
15.20
14.83
. 15.60
15.02
15.86
17.13
16.28
Rain Gauge is located at - 464 Harris Street, Concord - at the corner of Harris and McGill