NC0023884_Denial_20100803

+4
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
August 3, 2010
Sonja Basinger
Environmental Service Manager
Salisbury -Rowan Utilities
1 Water Street
Salisbury, NC 28144
Dee Freeman
Secretary
Subject: Request for the Removal of Cascade Post Aerator from NPDES Narrative
NPDES Permit NCO023884
Salisbury -Rowan Utilities WWTP
Rowan County
Dear Ms. Basinger:
The Division has reviewed your July 12, 2010 letter, and after some additional clarification has determined that
the Cascade Post Aeration description must remain in your permit. The permit must provide a description of all
treatment process components. The only consideration for removing any component description would be in the case
where the component is physically removed from active service and no longer has any wastewater flow, nor poses any
water quality issues.
Based on the approved Authorization to Construct and further discussions with the Mooresville regional office,
the arrangement attached to your letter, with the chlorinated wastewater flow entering the liquid dechlorination
treatment section, followed by the Parshall flume, followed by the effluent composite sampler is acceptable. In this
arrangement the UV system is no longer an active treatment component and is considered a flow channel.
Whether you measure the effluent dissolved oxygen at the top or bottom of the cascade system is your choice,
as long as can demonstrate that the dissolved oxygen level is not diminished as it flows through the cascade system.
Your effluent dissolved oxygen level has to meet a minimum water quality standard daily average level of 5.0 mg/I as
stated in your permit. As your flow increases the effluent dissolved oxygen level will change.
If you have any additional questions about sample locations contact the Mooresville regional office. If you have
any questions about your request you can contact Ron Berry by phone at [phone] or by email at
[e-mail].
Sincerely,
'�L 5ery
Ron Berry
NPDES Group
Cc: Mooresville Regional Office/John Lesley/Wes Bell (email)
NPDES File
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 One
Phone: [phone] FAX: [phone] Customer Service: 1-877-623-6748 NorthCarohna
Internet: http: 11 h2o.e4ir.state.nc.usl �/ � 1�����`>�
An Equal Opportunity 1 Affirmative Action Employer (�/K

PHONE LOG: Ms. Basinger, Salisbury -Rowan WWTP NC0023884 213M 7/20/10
Discussed mod application. Currently, using UV for disinfection and composite sample is being taken exit
effluent meter (before UV and post aeration). Grab samples taken exit UV for fecal coliform and exit
post cascade aeration for DO. Have approval to construct chlorination and de -chlorination systems.
Plans are to use UV as back up only.
Issue:
Region is stating that composite sampler must be at exit of last treatment step, post aeration, and is
compliance violation if not moved. Permittee does not to want to go to the expense of moving meter
and composite sampler but request that the post aeration unit be declared not a treatment unit and
removed from the permit treatment description. Hopefully, this will allow the composite sampler to
stay where it is. Will leave post aeration in service but will not taken grab samples exit unit. Permittee
provided seasonal data on DO going in and exiting post aeration unit.
Note:
1) Replacing UV with chlorination/de-chlorination for economic reasons. UV is a high maintenance,
high cost system.
2) Post aeration was deem necessary for the 20 MGD expanded capacity.
3) Permittee checked some spot samples of DO at composite sampler and inlet post aeration,
noted no difference.
Talked to Jeff about diffuser design and change to single port. River velocity was close to multiport
velocity causing poor mixing. Going to single port provided more velocity differential and thus better
mixing. Most likely would not change if expansion occurred. However, tracer test was recommended by
Division to confirm performance at expanded rate.
Need to talk to John Leslie at MoRO. Les Bell also involved.

a
Sa/isbury-�P�wan
July 12, 2010
Mr. Tom Belnick
NCDENR/ DWQ/ NPDES Supervisor
1617 Mail Service Center
Raleigh, NC 27699-1617
?Z 10 �oRi
1"J+ � 1�
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Re: Salisbury -Rowan WWTP NPDES Permit NCO023884
Request for the Removal of Cascade Post Aerator
Dear Mr. Belnick,
Salisbury -Rowan Utilities (SRU) submits the following effluent dissolved oxygen study
(enclosed) for the subject permit to demonstrate that the cascade post aerator is not beneficial as a
treatment process, and request the removal of the cascade post aerator as a treatment process from
the subject permit (Supplement to Permit Cover Sheet (3)).
SRU received an Authorization to Construct (ATC), issued on September 4, 2009, for the
addition of liquid chlorine treatment for the Grant and Town Creek treatment trains, and liquid
dechlonnation treatment for the combined effluent from both treatment trains. Upon approval
from the Division of Water Quality with the removal of the cascade post aerator from the subject
permit, SRU will install and operate the following:
• dechlore system prior to the effluent parshall flume
• effluent sampling station will be post parshall flume
• use of the ultraviolet system as a secondary back-up to disinfection (with effluent
sampling point post UV with portable composite sampler when using secondary system)
(map enclosed)
Please contact me at [phone] if you require any clarification or additional
information regarding the subject request. I appreciate your assistance in this matter.
Sincerely,
)4 ' Ger �
Sonja Basinger
Environmental Services Manager
Enclosures (D.O. Study, Effluent Map)
Cc: Jim Behmer, Director, Salisbury -Rowan Utilities
Robert Krebs, Regional Supervisor, DENR/DWQ/SWP/MRO
Keith Garbrick, Associate Vice President, Pease Associates
Q
JUL 19 2010
DENR-WATER QUALI N
POINT SOURCE BRANCH
1 Water Street
Salisbury, NC 28144
Salisbury -Rowan Utilities
Telephone [phone]
Fax [phone]

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Grants Creek YE D.O. Study
Month
12:OOam
4:OOam
8:OOam
12:OOpm
4:OOpm
8:OOpm
Sept
Top
Bottom
Top
Bottom
Top
Bottom
Top
Bottom
Top
Bottom
Top
Bottom
1
2
3
4
5
6
7
8
9
6.6
6.91
7.3
7.4
7.8
7.6
6.7
7.4
7.5
10
7.2
7.3
7.11
7.2
7.4
7.7
7.2
7.5
7.1
7.4
7.2
7.3
11
6.9
7.1
7.1
7.1
6.6
7.1
6.8
7.1
6.7
7.1
6.6
6.9
12
6.7
7.1
6.1
7.1
6.2
6.5
6.4
6.4
6.2
6.3
6.1
6.4
13
6.1
6.4
6.1
' 6.4
6.5
6.7
6.6
6.5
6.6
6.5
6.4
6.7
14
6.3
6.8
6.3
6.8
7.6
7.6
7.4
7.6
7.4
7.8
7.3
7.7
15
7.3
7.5
7.2
7.4
7.5
7.6
7.5
7.8
7.5
7.7
7.3
7.5
16
7.2
7.4
7.1
7.2
5.9
6.1
6
6
6.3
6.5
7.3
8.1
17
8.1
8.1
7.9
8.7
6.1
6.2
6.1
6.1
6
6.1
6.1
6.2
18
7.1
7.4
6.6
6.9
6.1
6.2
7.3
7.8
7.4
7.7
19
7.31
7.5
7.2
7.5
7.51
8.1
1
1
7.3
7.7'
20
7.31
7.8
7.4
7.7
7.31
7.7
1
7.41
7.8
7.5
7.7
21
7.61
7.9
7.5
7.8
7.21
7.6
7.51
7.7
7.41
7.6
7.3
7.5
22
6.8
7.7
7.7
7.5
7.41
7.8
7.31
7.6
7.31
7.6
7.4
7.6
23
7.3
7.6
7.41
7.6
7.81
8.1
1
7.81
8.1
7.6
7.8
24
7.5
7.8
7.81
8.1
7.61
8.1
7.51
7.8
7.41
7.9
7.5
7.8
25
7.71
8.1
7.51
7.7
7.41
7.5
1
7.21
7.3
7.7
7.8
26
7.61
7.7
7.41
7.6
7.31
7.4
7.5
7.6
7.51
7.6
7.7
7.8
27
7.71
7.8
7.41
7.5
7.31
7.4
7.4
7.5
7.21
7.3
7.6
7.7
28
7.51
7.6
7.61
7.7
7.71
7.8
8.1
8.3
8.1
8.2
7.7
7.8
29
8.1
8.4
8.2
8.4
7.9
8.1
8.2
8.4
8.1
8.2
8.1
8.2
30
8.4
8.6
8.3
8.5
8.3
8.7
8.1
8.4
8.2
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Grants Creek YE D.O. Study
Month
12:OOam 4:OOam 8:OOam 12:OOpm 4:OOpm 8:OOpm
OCt.
Top Bottom Top Bottom Top Bottom Top Bottom Top Bottom Top Bottom
1
8.1 8.3 8.1 8.3 8.2
8.6 8.4 8.6 8.1 8.4 8.3 8.4
2
7.8 8.1 8.2 8.3
8.3
8.6
n/a
n/a 8.1
8.2 8.1
8.3
3
8.1
8.4
8.2
8.5
8.1
8.2
7.91
8.1
7.71
7.9
7.5
7.7
4
7.7
7.9
8.21
8.5
9.81
8.1
7.8
8.1
7.91
8.2
8.4
8.6
5
8.3
8.5
8.41
8.6
8.3
8.4
8.5
8.6
8.31
8.2
8.1
8.2
6
8.1
8.4
7.81
8.1
8.1
8.3
7.8
8.3
8.11
8.2
7.9
8.1
7
8.1
8.1
7.6
8.1
6.8
6.4
7.9
8.1
8.11
8.2
8.1
8.2
8
7.8
8.1
7.9
8.1
7.8
8.1
7.9
8.1
8.11
8.3
7.4
8.1
9
8-2T
8.4
8.2
8.4
8.11
8.2
7.9
8.1
7.8
8.1
7.7
8.1
10
7.61
8.1
6.81
7.2
7.1
7.2
7.1
7.1
6.8
7.1
11
6.7
7.1
6.5
6.9
7.1
'7.5
7.5
7.8
7.5
7.6
7.4
7.5
12
7.21
7.5
7.2
7.6
8.21
8.3
7.91
8.2
8.4
8.7
8.31
8.3
13
8.4
8.6
8.2
8.4
8.81
8.7
8.61
8.8
8.51
8.7
8.91
8.6
14
8.3
8.4
8.1
8.2
7.41
7.5
7.61
7.9
7.61
7.9
7.5
7.7
15
7.7
7.9
7.5
7.9
7.11
7.2
7.11
7.3
8.81
9.1
8.7
9.1
16
8.8
9.1
8.6
8.9
8.71
9.1
n/a
I n/a
8.7
8.9
8.7
8.9
17
8.4
8.6
8.5
8.7
8.5
8.8
n/a
n/a
8.8
9.2
8.9
9.2
18
8.9
9.2
8.9
9.3
8.7
9.2
n/a
n/a
8.9
9.2
8.91
9.1
19
9.2
9.2
9.1
9.1
9.9
10.1
9.5
9.7
9.4
9.5
9.41
9.6
201
9.4
9.7
9.3
9.4
9.1
9.1
9.3
9.5
9
9.4
9.2
9.4
21
9.1
9.3
9.21
9.4
9.31
9.5
9.2
9.3
- 9
9.3
9
9.2
22
8.8
9
8.8
9.1
8.8
9.2
8.9
9.2
8.6
9
9
9.1
23
8.5
8.5
8.6
8.8
8.1
8.8
8.11
8.6
8.1
8.5
8.6
8.8
24
8.1
8.3
8.2
8.3
6.8
8.4
81
8.5
8.2
8.3
8.1
8.1
25
8.3
8.6
8.5
9
8.1
8.3
n/a I
n/a
8.4
8.7
8.21
8.5
26
8.3
8.5
8.4
8.7
8.61
8.7
8.51
8.7
8.6
8.7
8.6
8.7
27
8.6
8.9
8.4
8.7
8.2
8.6
8.7
9
8.4
8.6
8.4
8.6
28
8.6
9
8.3
8.9
6.21
7.5
6.3
6.5
6.2
6.4
6
6.4
29
6.2
6.4
6.2
6.5
6
6.1
6
6.1
6
6.1
6.1
6.1
30
6
6
6
6
6
6.1
n/a
n/a
6.3
6.4
6.1
6.3
3 1
6
6
6
6
6
6
6
6.2
6.1
6.2
6.11
6.3

Grants Creek YE D.O. Study
Month
12:00am
4:00am
8:00am
12:00pm
4:00pm
8:00pm
NOV
Top
Bottom
Top
Bottom
Top
Bottom
Top
Bottom
Top
Bottom
Top
Bottom
1
5.9
6.1
5.7
5.8
5.91
6.1
6.1
6.2
6.1
6.1
5.9
6.1
2
5.6
5.9
5.5
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6.1
5.7
6.1
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3
5.6
5.9
5.5
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8.8
8.9
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9.3
8.8
9.1
4
8.7
9.1
8.9
9.2
8.6
8.8
8.81
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8.6
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5
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8.7
9.1
9.1
9.2
n/a
n/a
9.1
9.2
9.1
9.1
6
8.6
8.9
8.4
8.7
7.1
7.4
7.3
7.1
7.3
7.5
6.9
7.2
7
7.6
7.9
6.8
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7.4
7.9
7.6
7.6
7.5
7.7
7.3
7.5
8
7.1
7.4
6.71
6.9
7.4
7.6
7.8
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7.2
6.6
6.8
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8
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11
7.4
7.6
7.4
7.6
8.7
9.1
n/a
n/a
6.7
6.9
5.9
6.7
12
6.3
6.8
6.11
6.8
5.7
5.9
6.6
6.8
6.5
6.8
6.8
7.3
13
6.9
7.2
7.11
7.6
8.6
9.2
8.61
9.3
8
8.2
8.4
8.6
14
8.5
8.7
8.31
8.5
8.2
8.4
8.6
8.8
8.3
8.7
8.1
8.3
15
8.11
8.3
8.7
8.3
8.5
8.8
8.8
9.1
8.8
9.2
8.5
8.6
16
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9.1
8.7
8.9
9.1
9.5
8.8
9.3
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9.1
9.5
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17
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8.8
8.6
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8.9
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9.3
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18
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8.8
8.4
8.7
19
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8.6
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8.7
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8.6
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21
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8.9
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22
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8.9
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Month
12:00am
4:00am
8:00am
12:00pm
4:00pm
8:00pm
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Top
Bottom
Top
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Top
Bottom
Top
Bottom
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