NC0023337_correspondence_20130220

NANCY JACKSON,CMC
TOWN ADMINISTRATOR -CLERK
TuGrn of $crrflatth Nich
P.O. Box 537
1310 MAIN STREET
SCOTLAND NECK, NC 27874
www.townofscotlandneck.com
February 20, 2013
Mr. Danny Smith, Regional Supervisor
NCDENR Raleigh Regional Office
1628 Mail Service Center
Raleigh, NC 27699-1628
Reference: NOV-2013-LV-009 Scotland Neck WWTP NC 0023337
Dear Mr. Smith,
MAYOR
LEONARD J. BUNTING
COMMISSIONERS
FORREST BRADLEY, JR.
BRYAN DOBSON
JAMES GUNNELLS
CHARLIE SHIELDS
RAYMOND WATSON
FEB 22 2013
I am writing in response to your February 11, 2013 Notice of Violation for the May, 2012
Effluent Fecal Coliform violation experienced at the Town of Scotland Neck Wastewater
Treatment Facility. I am providing additional information for your review and
consideration.
The WWTP is currently utilizing a temporary disinfection process that includes sodium
hypochlorite and sodium bisulfate for chlorination and dechlorination. This chemical feed
system currently makes use of existing contact time through the filter and post aeration
processes. As you may remember, this modification was made as an interim measure due to
a failing UV disinfection that had been provided during the last facility upgrade. During
the week of May 26, 2012, the Scotland Neck WWTP experienced significant rainfall which
contributed to increased periods of flow and adverse operating conditions within the
treatment process, significantly reducing the ability to maintain the required disinfection
detention times. As a result of these conditions, the facility exceeded the weekly average
Fecal Coliform permit limitation, of 400 colonies per 100 milliliters, with an actual weekly
average of 439.6 colonies per 100 milliliters. The monthly average permit limitation was
compliant for the reporting period.
The Town of Scotland Neck has received a grant from the State to construct a chlorine
contact chamber to improve the detention times required for disinfection and eliminate the
Fecal Coliform permit excursions. A schematic and photograph is provided below which
shows the new chlorine contact chamber.
Phone: [phone] • Fax: [phone] • email: [e-mail]

The contractor building the chlorine contact chamber has furnished one (1) transit time
ultrasonic flowmeter and one (1) transmitter for this project. The flow meter is an ultrasonic
flowmeter as manufactured by Sono-Trak (Model ST-30). The meter will be able to
accurately measure flows of pumped fluid in the range of 100 to 1,500 gpm with an
accuracy of +0.5% of actual flow. The town anticipates that the new contact chamber
will be completed and operational by February 20, 2013. We expect that the facility will
be better equipped to handle high flow events, without fecal coliform exceedance, after the
commissioning of the new chlorine contact chamber.
I hope this information is helpful in describing the events during this period. If you have
any questions or require additional information, please do not hesitate to contact me at
252-826-3152 or [e-mail]
The town appreciates your guidance and support in this area.
Sincerely,
Town of Scotland Neck
Nancy Jackson, CMC
Town Administrator/Clerk
cc: Anthony Gorham, BORC
cc: Gerald Brannon, AM United Water