NC0026051_BIMS #202201078 5-day report_20220713

Hayes, Mitch
From: Shaw, Wade W. <[e-mail]>
Sent: Wednesday, July 13, 2022 12:36 PM
To: Hayes, Mitch
Cc: Brixey, Stephanie; Moore, Amy; Gibson, Jay; Davis, Shawn D.
Subject: RE: [External] RE: Regional office contacts
Attachments: Outfall Area jpg; Upstream jpg; Downstream jpg; Stream Samples.pdf; SCADA Data.pdf;
WWTP-Bypass-Rpt-Form-7-8-22.doc
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Good Morning,
Please find attached 5-day report regarding a tertiary filter partial bypass that
occurred during a storm/high flow event on Friday 7/8/22.
Attached you will find the SCADA graph showing influent flow (blue), effluent
flow (green), and effluent turbidity (purple).
Based on this data, it is estimated that the tertiary sand filter was not
bypassed.
The most that could have possibly been partially bypassed between 2130 and
2200 (30 min) at a flow of 14.5 MGD.
14,500,000 / 24 = 604,167 x .5 hrs. = 302,083 Gals total flow to filters
Assuming 1/2 went through the filters = 151,042 Gals bypassed.
Upstream and Downstream samples were collected. Attached are the results
and pictures of the outfall location, downstream, and upstream. There were
no visible signs of solids in the effluent channel, near the outfall, or
anywhere in the stream. I checked the log book and the on duty operator
did not personally witness a bypass of the filters nor recorded a bypass of
the filters.
It was originally believed there was a bypass based on the Utility Supervisor
coming in the following morning and looking at the SCADA trending, including
flows and turbidity readings. I reported the bypass based on this information.
Once I came to the plant and looked at the data, effluent channel, outfall, and
stream and compared it to the timeline of when the additional clarifier came
on line, I believe that no bypass actually occurred.
Timeline:
1) 9:28 PM, I got a call that dirty water was entering into the filters. Inf.
Flow @ 14.35 MGD, Eff. Flow @ 15.73 MGD, Turbidity @ 1.06 NTU
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2) Approximately 9:40 PM, Additional clarifier was placed on-line. Inf.
Flow @ 14.42 MGD, Eff. Flow @ 10.08 MGD, Turbidity @ 0.79 NTU
3) 9:50 PM, Turbidity max out on meter. Inf. Flow @ 14.67 MGD, Eff.
Flow @ 12.55 MGD, Turbidity @ Max
4) 10:30 PM, Turbidity began coming down to normal range. Inf. Flow @
14.36 MGD, Eff. Flow @ 7.94 MGD, Turbidity @ on its way down.
With this information, please cancel the original report.
Please contact me if you need any further information.
Thanks
WADE W. SHAW f UTILITIES SUPERINTENDENT
pro
DURHAM COUNTY
Engineering and
Environmental Services
5926 Highway 55 East
Durham, North Carolina 27713
Office: [phone]
Cell [phone] I Fax [phone]
Email: wehaw(&dconc.aov
PLEASE NOTE: OUR MAIN OFFICE NUMBER IS [phone]
From: Hayes, Mitch <[e-mail]>
Sent: Wednesday, July 13, 2022 11:55 AM
To: Shaw, Wade W. <[e-mail]>
Subject: RE: [External] RE: Regional office contacts
Wade,
Jason has been in meetings all morning long. I thought he would have called you between meetings. I would say go
ahead and submit the 5-day report and we will take it from there. Our office normally does not take action on bypasses
unless they are extreme in nature. I highly doubt we will take action on this bypass.
Mitch
Mitch Hayes
Environmental Specialist
3800 Barrett Drive
Mail Service Center 1628
Raleigh, NC 27809-1628
919.791.4261
Raleigh Regional Office
Regional Operations Section
NCDEQ — Division of Water Resources
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: Shaw, Wade W. <[e-mail]>
Sent: Wednesday, July 13, 2022 11:46 AM
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