WQ0002708_Correction_20011217

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross Jr., Secretary
Gregory J. Thorpe, Ph.D., Acting Director
December 17, 2001
MR. J. RuSSELL ALLEN, CITY MANAGER
CITY OF RALEIGH
POST OFFICE Box 590
RALEIGH, NORTH CAROLINA 27602-0590
NCDENR
NORTH CAROLINA DEPARTMENT or
ENVIRONMENT AND NATURAL RESOURCES
Subject: Permit No. WQ0002708 Correction
City of Raleigh
Wrenn Road Spray Irrigation Facility
Wastewater Treatment and Spray Irrigation System
Wake County
Dear Mr. Allen:
In accordance with a written correspondence received on November 1, 2001 from Mr. a Dale Crisp,
Public Utilities Director for the City of Raleigh (City), we are forwarding herewith a corrected Page 1 and Page 7 of
Permit No. WQ0002708, issued on August 13, 2001, for the subject wastewater treatment and spray irrigation
system.
The following addresses Mr. Crisp's comments in the order in which they were presented to the Division of
Water Quality (Division) for consideration:
1. Mr. Tim Woody, Operator in Responsible Charge (ORC) for the Wrenn Road Spray Irrigation System
has been included as a secondary contact person in the Division's database. The Division will make
every effort to ensure that Mr. Woody is copied on all correspondence sent regarding this permit.
2. After further discussion with Mr_ Woody, it is now clear that there is some wetted area of the spray
irrigation facilities that was permanently removed ' from use as well as some that is temporarily
removed from use during wetter periods of the year. The permanent reduction in wetted area is that
which was addressed with this permit issuance. However, any temporary reduction in wetted area
should only be reflected on Form NDAR-1 (i.e., no modification of this permit is necessary). As such,
Condition IV. 3. of this permit has been modified to reflect the fact that the wetted area irrigated, in
addition to the field irrigated, should be reported to the Division on a monthly basis.
3. It is now the Division's understanding that an influent flow measuring device has been installed and
operational at the Wrenn Road Spray Irrigation Facility for several years. For this reason, Condition
IV. 2. of this permit has been modified with this correction to remove language that required plans and
specifications to be submitted for as well as installation of such a device within a year of permit
issuance.
4. As discussed between Ms_ Dana Folley of the Division's Pretreatment Unit and Mr. Woody, the City's
request to modify Condition H. A. 2. of this permit cannot be accommodated. First, the pretreatment
program language included in this permit is taken from the federal pretreatment regulations (i.e., 40
CFR Part 403.5(b)) and cannot be changed. More importantly, after Ms. Folley's detailed explanation
of the Ianguage and its interpretation, Mr. Woody stated that he was satisfied with the original language
and that his concerns have now been addressed.
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5. Condition 111. 4, of this permit is a standard condition that is included in all permits issued to
wastewater treatment and spray irrigation facilities across the State of North Carolina and cannot be
deleted. if the City has any questions as to how the Division would interpret this condition in a specific
situation, please contact Mr. Brian Wrenn of the Division's Non -Discharge Compliance and
Enforcement Unit.
6. Form NDAR-1 requires self -monitoring of continuous hourly, daily, monthly, and annual loading on
each Feld of the spray irrigation facilities. However, only an average of the weekly loading on each
field of the spray irrigation facilities must be reported on this form. For this reason, Condition 1V. 3. of
this permit has been modified to replace the "continuous weekly" language with a requirement to
monitor continuously on a daily basis, per the City's request.
During the preparation of this permit correction, the Division noticed that a minor typographical error had
been made in the preparation of this permit. Specifically, in the description of the permitted wastewater treatment
and spray irrigation facilities, it was stated that "at least 25,000 gallons per day may be diverted to the Permittee's
Neuse River Wastewater Treatment PIant." The correct volume of flow that may be diverted is 250,000 gallons per
day. The Division apologizes for any confusion that this error may have caused
Please replace Page 1. and Page 7 with the corrected Page 1 and Page 7 into Permit No. WQ0002708,
issued on August 13, 2001.
If you need any additional information concerning this matter, please contact Ms. Shannon Mohr
Thornburg via telephone at [phone], extension 353, or through e- at [e-mail].
Sinc ,
??Gregory J. Thorpe, Ph.D.
cc: Mr. H. Dale Crisp, City of Raleigh
Mr. Tim Woody. City of Raleigh
Wake County Health Department
Raleigh Regional Office, Water Quality Section
Raleigh Regional Office, Groundwater Section
Central Office, Groundwater Section
Technical Assistance and Certification Unit
Non -Discharge Compliance/Enforcement Unit
Permit File WQ0002708
2

NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
RALEIGH
WASTEWATER TREATMENT AND SPRAY IRRIGATION SYSTEM PERMIT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended,
and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
City of Raleigh
Wake County
FOR THE
continued operation of 1.54-million gallon per day (i.e., only up to 1.29 million gallons per day may be irrigated
onto the wetted area of the spray irrigation facilities, while at least 250,000 gallons per day may be diverted to
the Permittee's Neuse River Wastewater Treatment Plant) wastewater treatment and spray irrigation facilities,
consisting of the following minimum components: dual 25-acre stabilization/storage lagoons with a minimum
of 30 days detention, an additional storage capacity of 46 days, and a liner of natural clay material with a
minimum compacted thickness of one foot and a maximum hydraulic conductivity of 10`6 centimeters per
second; a system using calcium bypochlorite for wastewater effluent disinfection; an irrigation pump station
with four 2.750-gallon per minute pumps; a solid -set irrigation system covering approximately 269.72 acres of
wetted area; and all associated piping, valves, instrumentation, controls, and other appurtenances necessary to
make complete and operational wastewater treatment and spray irrigation facilities. The above -described
facilities are intended to serve the City of Raleigh and its wastewater customers (i.e., including the Town of
Garner) with no discharge of wastes to surface waters, pursuant to the permit renewal application received on
September 28, 2000 as well as the additional information received on March 2, 2001 and May 1, 2001, and in
conformity with the project plan, specifications, and other supporting data subsequently filed and approved by
the Department of Environment and Natural Resources and considered a part of this permit.
This permit shall be effective from the date of issuance until July 31, 2006; shall void Permit No.
WQ0002708, issued on April 30, 1996; and shall be subject to the following specified conditions and
Iimitations:
I. PERFORMANCE STANDARDS
The wastewater treatment and spray irrigation facilities shall be effectively maintained and operated
at all times so that there is no discharge to the surface waters nor any contamination of groundwater
that will render them unsatisfactory for normal use. In the event that these facilities fail to perform
satisfactorily, including the creation of nuisance conditions or failure of the irrigation areas to
assimilate the wastewater adequately, the Permittee shall take immediate corrective actions
including those actions that may be required by the Division of Water Quality-�Division), such as
the construction of additional or replacement wastewater treatment and disposal facilities.

IV. MONITORING AND REPORTING REQUIREMENTS
1_ Any monitoring (i.e., including groundwater, surface water, soil or plant tissue analyses) deemed
necessary by the Division to ensure surface water and groundwater protection shall be established
and an acceptable sampling reporting schedule shall be followed.
2. Influent wastewater to the wastewater treatment facilities shall be continuously monitored and
recorded. Daily flow values shall be reported on Form NDMR-1. The Permittee shall install an
appropriate flow measurement device consistent with approved engineering and scientific practices
to ensure the accuracy and reliability of flow measurement. FIow measurement devices selected
shall be capable of measuring flows with a maximum deviation of less than 10 percent from true
flow, accurately calibrated at a minimum of once per year, and maintained to ensure that the
accuracy of the measurements is consistent with the accepted capability of that type of device.
Calibration records for the flow measurement devices shall be kept on file by the Permittee for a
period of at least three years. At a minimum, data to be included in this documentation shall
include:
a. Data of flow measurement device calibration,
b. Name of person performing the calibration of the flow measurement device, and
C. Percent that the flow measurement device is from true flow at the time of calibration.
3. Adequate records shall be maintained by the Permittee tracking the amount of wastewater irrigated.
These records shall include, but are not necessarily limited to, the following information:
a. Date of irrigation;
b. Volume of wastewater irrigated;
C. Field irrigated;
d. Wetted area irrigated;
C. Length of time field is irrigated;
f. Continuous daily, monthly, and year-to-date hydraulic (i.e. in inches per acre) loadings for
each field;
g. Weather conditions; and
h. Maintenance of cover crops.
4. The wastewater effluent from the wastewater treatment facilities shall be monitored by the
Permittee at a point following all wastewater treatment processes (i.e., including disinfection) and
prior to irrigation every March July, and November for the following parameters:
Ammonia -Nitrogen (NH,-N)
Biochemical Oxygen Demand (BOD)
Calcium
Chemical Oxygen Demand (COD)
Conductivity
Fecal Coliform
Magnesium
Nitrate -Nitrogen (NO,-N)
pH
Sodium
Sodium Adsorption Ratio (By Calculation)
Total Kjeldahl Nitrogen (TKN)
Total Phosphorus
Total Suspended Solids (TSS)
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