NC0047597_Correspondence_19900507

State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27611
James G. Martin, Govemor
William W. Cobey, Jr., Secretary
May 7, 1990
A. T. Rolan
Department of Water Resources
City of Durham
101 City Hall Plaza
Durham, NC 27701
George T. Everett, Ph.D.
Director
Subject: Instream Monitoring Requirements for the Farrington Road WWTP
(NC0047597, Durham County) and the Triangle WWTP (NC0026051,
Durham County)
Dear Mr. Rolan:
The Division of Environmental Management (DEM) was recently contacted by
telephone by members of your staff and requested to review the summer instream
monitoring requirements for Durham's Farrington Road, Eno River, Lick Creek,
and Triangle WWTPs. Upon review of these requirements, it has been concluded
that weekly instream monitoring of nutrients for the Farrington Road WWTP is
acceptable, rather than the 3/week frequency currently contained in the NPDES
permit for that facility. The NPDES permits for the Farrington Road and
Triangle facilities will be changed so the instream monitoring requirements
are identical. These changes only affect the monitoring requirements for the
months of June, July, August, and September, which will be:
Weekly: TP, PO4, TN, TKN, NO2 & NO3, and NH3
3/Week: Temperature, DO, Fecal Coliform, Conductivity, and pH
Please note that pH monitoring will be required 3/week at both plants, as
verbally agreed to by members of your staff. Also note that these requiie-
ments apply only for the months listed and apply to both the Farrington Road
and Triangle plants. They should be performed at all sites currently listed
in the respective permits. No other changes to either permit will be made.
I have instructed my staff to make the appropriate modifications to the
NPDES permits. If you have not received the modified permits by June 1, when
these requirements go into effect, you may as per this letter, monitor accor-
ding to the above schedule and not be considered non -compliant with the NPDES
permits.
Pollution Prevention Pays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
A.. r..�.,1 �1.,.....-. ,.,i e., AfT...,,

Page two
-Mr Qr►l an -
If you have any questions or comments regarding this matter, please con-
tact Trevor Clements or Dale Overcash of my staff at [phone].
cc: Dale Overcash
Arthur Mouberry
Trevor Clements
Bob DeWeese
Central Files
cerely,
orge T.
1

DIVISION OF ENVIRONMENTAL MANAGEMENT
May 1, 1990
MEMORANDUM
TO: Dale Overcash
THRU: Ruth Swanek ��
Trevor Clements
FROM: Mike Scoville tO5
SUBJECT: Instream Monitoring Requirements for Durham's Farrington Road WWTP
(NPDES No. NC0047597, Durham County)
The City of Durham is currently preparing for their summer instream
monitoring requirements. Technical Support has reviewed the NPDES permits
for the Triangle WWTP, Eno River WWTP, Lick Creek WWTP, and Farrington Road
WWTP, and has determined that 3/week instream nutrient monitoring for the
Farrington Road plant is not necessary. In order to provide consistency
with the Triangle WWTP (NC0026051) p ..:;it, and to aid Durham in their labo-
ratory and staff preparations, the instream monitoring requirements of both
facilities should be as follows:
Weekly: TP, PO4, TKN, NO2 & NO3, and NH3-N
3/Week: Temperature, DO, fecal coliform, pH, and conductivity
These monitoring requirements reflect a change of frequency of nutrient
monitoring in the Farrington Road WWTP from 3/week to weekly, and a change
of pH monitoring frequency in the Triangle WWTP permit from weekly to
3/week. These changes should apply to all instream monitoring sites for the
months of June, July, August, and September; no other aspect of either per-
mit should be changed. Please take the necessary steps to enact these
revised requirements.
If you have any questions or comments, please contact me.
cc: Central Files
Arthur Mouberry