NC0036269_staff comments_20110622

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WSACC DRAFT flow monitoring conditions
• Provide flow monitoring and maintain rec • . • r I years for the two influent pump
stations (Lower Rocky River and Main). Required flow monitoring will include peak
hourly flow, and daily flow. Monitoring will also include pump run times, both for
individual pumps and pumps running in combination, in order to establish the number of
pumps required to run for peak flow events.
• Provide an annual report for each influent pump station outlining all wet weather events
where all pumps were required to run to handle peak flows. This annual report shall be
submitted to the Mooresville Regional Office along with rainfall amounts specific to the
wet weather flow event. This report does not supersede any other reporting requirements.
The report should also indicate whether any reportable overflows occurred at either pump
station.
• In addition to monitoring the two influent pump stations, WSACC shall also maintain
records of points of monitoring for its individual jurisdictional bulk customers (i.e., local
government units) that are tributary to the WSACC system. Records shall be maintained
for 10 years and made available to the Division upon request. Basins with the highest
peak flows compared to average daily flow shall be discussed with the local government
unit and the WSACC Board with respect to targeted sewer rehabilitation in those specific
individual drainage basins.
• Please note that the Division may take further actions including, but not limited to, civil
penalty assessments and moratoria based on information provided regarding pump station
operations consistent with the NPDES permit, System -wide Collection System permit,
Division rules, and applicable statutes.
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Belnick, Tom
From: Poupart, Jeff
Sent: Tuesday, June 21, 2011 10:54 AM
To: Belnick, Tom
Subject: FW: WSACC
Attachments: WSACC DRAFT flow monitoring conditions.doc
After discussion with Deborah and since it is mostly the influent pump stations which I assume are inside the WWTP
fence we are ok with putting conditions in NPDES permit
From: Gore, Deborah
Sent: Monday, June 20, 2011 7:47 AM
To: Poupart, Jeff; Belnick, Tom
Cc: Leggett, Michael; Hassan, Monti
Subject: FW: WSACC
Just looked over the proposed permit conditions.
WSACC is requesting to increase their permitted flow from 24 to 26.5 MGD without any construction or modification to
their treatment plant or influent pump stations.
Just to clarify — overflows at influent pump stations are really a violation of the NPDES permit and not of the collection
system permit, correct?
I like the part about the satellite systems evaluating peak flows vs and average daily flows.
I also assume that sewer line extensions adding flow to the system will be permitted and evaluated in the same way as
always to ensure that the entire route to the treatment plant influent pump station has sufficient capacity.
I kind of wonder how the annual report will be evaluated - what are we looking for and what will be our response?
Deborah
From: Belnick, Tom
Sent: Friday, June 17, 2011 3:27 PM
To: Poupart, Jeff; Gore, Deborah
Subject: FW: WSACC
Jeff to talk with Deborah on Monday
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 may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.
From: Colson, Kim
Sent: Friday, June 17, 2011 1:08 PM
To: Belnick, Tom
Subject: WSACC
Tom — attached are draft (i.e., finalized when put into a permit) conditions to be incorporated into WSACC's
NPDES permit as a result our AtO request. That request is to move up on paper from 24 to 26.5 MGD without
i

construction. However, they will need some minor construction to deal with peak flows. And peak flows are
the issue making this review more challenging. I've reviewed these conditions with both MRO and WSACC,
though WSACC has not given a final o.k., but seem to be reaching consensus. Want to verify with you that
these conditions (or something similar) are acceptable to incorporate into the NPDES permit. Our plan is to
require them to apply for a minor modification before the new limits are effective. KC
Please note t
our new web a ress i ttp://portal.ncdenr.org/web/wq/cgls
Kim H. Colson
DWQ / Construction Grants and Loans Section
[e-mail]
[phone]
2728 Capital Blvd.
Raleigh, NC 27604
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to
third parties.
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