NC0069523_Response to NOV-2020-LV-0272_20200422

Department of Public Works
Water/Wastewater Division
4600 Goldmine Road
Monroe, NC 28110
T. 704-289-1434
F. 704-289-7395
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April 22, 2020
W. Corey Basinger,
Regional Supervisor
NCDEQ
610 East Center Avenue, Suite 301
Mooresville, NC 28115
Dear Mr. Basinger,
REC
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MOORESVILLE REGIONAL OFFICE
This letter is in response to NOV-2020-LV-0272, outlining the exceedance in monthly flow that
was experienced at our Tallwood WRF in January 2020. This exceedance was a result of
damage in the collections system, as well as higher than normal rain flows (6.2").
In early February 2020, the WRF staff notified collections system staff of higher -than -normal
flows being experienced at the WRF. Collections staff began an investigation consisting of
smoke testing and manhole inspections. Findings included multiple defects which have since
been addressed. A list of repairs includes:
® Re -lining and grouting of the influent wet well to eliminate infiltration at joins and pipe
penetrations.
® Installing inflow collector dishes in low-lying manholes.
® Installation of sealed manhole lid in a critical location.
® Repair/replace four clean -out caps.
® Repair of broken stand pipe.
® Discovered and repaired major pipe defect.
® Grouted leaking cone on a manhole.
Since these repairs were performed, WRF staff have seen a noticeable decrease in flows to the
plant. March ADF is down to 0.048.
We intend to continue our efforts finding and reducing the I&I in the Tallwood basin. If you have
any questions or concerns please contact me at 704-296-4215.
Sincerely,
Andrew Neff, PE
Water & Wastewater Division Director
Cc: Hyong Yi, Public Works Administrator
Josh Brooks, Asst. Div. Director, Water & Wastewater
Bart Farmer, WRF Superintendent
Greg Morgan, Utility Services Superintendent
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