NC0035866_NOV-2018-LV-0245 Response_20180426

CHATHAM COUNTY PUBLIC UTILITIES & WATER
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April 26,2018 APRmi3:so
ec2018sDanny Smith, Regional SupervisorWater ingceFseurtonni
Water Quality Regional Operations Section
Raleigh Regional Office
Division of Water Resources,NCDEQ
1628 Mail Service Center, Raleigh, NC 27699-1628
Response: Notice of Violation(NOV) and Intent to Assess Civil Penalty
Bynum WWTP;NPDES Permit NC0035866
NOV-2018- LV-0245
Dear Mr Smith,
This letter is in response to the Notice of Violation(NOV-2018-LV-0245) dated April 13, 2018
our office received April 20, 2018.
The Fecal Coliform was sampled on 1/09/2018 and was out of compliance (870#/100ML). The
Fecal Coliform samples before and after that date returned to levels less than 1.0#/100ML. This
incident the county experienced was in direct relation to a November 2017 sample that was out
of compliance on 11/21/2017 with a Fecal Coliform level of 1,600#/100ML (shown on
November 2017's Discharge Monitoring Report). A new bucket of chlorine tablets purchased
through Promag Enviro Systems (British Columbia, Canada) was opened and being used prior to
the two non-compliance sample dates. The county determined it could be a bad batch of the
chlorine tablets. The tablets were dissolving at a very slow rate. The county opened a new
bucket and stop using the bad batch of chlorine tablets. The Fecal Coliform sampling results
have been less than 1#/100ML since disposing of the bad batch of chlorine tablets. As a
precaution the county hired Clark's Septic Service to pump out the basins and the Aerobic
Digester and reseeded the plant with healthy microorganisms from the Town of Siler City's
WWTP. We also re-trained our sampling staff on proper sampling procedures to minimize the
risk of outside contamination during the acquisition of the effluent samples.
Chatham County's mission and goal is to properly and successfully treat the wastewater that
enters our Bynum WWTP and to stay in compliance with the rules and regulations set forth by
NCDEQ. Through continual evaluation and improvement of our standard operating procedures

CHATHAM COUNTY PUBLIC UTILITIES & WATER
UTILITIES—Public Works Division �Q �p � � iyj. Phone [phone]
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■ Wastewater Treatment Plant i\Il�l ,
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POST OFFICE BOX 910
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and best management practices the County will strive to consistently achieve this goal. Thank
you for your time
Chatham County respectfully requests that any civil penalty be waived due to the error in
manufacturing of the chlorine tablets.
Sincerely,
Lany Bridges
Public Utilities Director