NC0047384_Permit Modification_20000505

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
May 5, 2000
Mr. Arthur White
City of Greensboro
P.O. Box 3136
Greensboro, North Carolina 27402-3136
A7A
NCDENR
Subject: Authorization to Construct/Permit Modification
ATC No. 047384ACF
NPDES Permit No. NC0047384
T.Z. Ozborne WWTP
Guilford County
Dear Mr. White:
The Division of Water Quality's NPDES Unit has reviewed your request for an Authorization
to Construct at the T.Z. Ozborne WWTP. The Division finds, that upon completion of the Phase III
upgrades to the treatment plant, that the proposed increase in the design capacity of the treatment
system is satisfactory. In accordance with your request, the Division is forwarding herewith a
modification to the subject permit.
Recommendations
Rerating of this facility has been evaluated and approved, increasing the design capacity of
the treatment facility to 24 MGD. The Division is aware that the recent violation of the ammonia
limit (February 2000) was in part the result of a fluidized air blower malfunction on the incinerator.
The Division is concerned about the circumstances that resulted in the February 2000 violation of
the ammonia limit and recommend that the T.Z. Ozborne WWTP continue to evaluate alternatives
to upgrade the older multiple hearth incinerator.
Enclosed please find the modified effluent limitations page. This page should be inserted
into your permit in place of the 22-MGD Effluent Limitations and Monitoring Page and the old one
discarded. This permit modification is issued pursuant to the requirements of North Carolina
General Statute 143-215.1 and the Memorandum of Agreement between North Carolina and the U.
S. Environmental Protection Agency dated December 6, 1983.
Please take notice that this permit is not transferable. Part II, E.4. addresses the
requirements to be followed in case of change in ownership or control of this discharge. This
permit does not affect the legal requirement to obtain other permits which may be required by the
Division of Water Quality or permits required by the Division of Land Resources, Coastal Area
Management Act or any other Federal or Local government permit that may be required.
If any parts , measurement frequencies or sampling requirements contained in this permit
modification are unacceptable to you, you have the right to an adjudicatory hearing upon written
request within thirty (30) days following receipt of this letter. This request must be a written
petition conforming to chapter 150B of the North Carolina General Statutes, filed with the Office of
Administrative Hearings, Post Office Drawer 27447, Raleigh, North Carolina 27611-7447. Unless
such demand is made, this decision shall be final and binding.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer Internet httpf/h2o.enr.state.nc.us/

T.Z. Ozborne WWTP
NPDES Permit No. NC0047384
ATC No. 047384ACF
Page 2
Engineer's Certification
Upon completion of construction and prior to operation of the modified facility, the
Permittee shall provide the Division with a certification (copy enclosed) from a professional engineer
registered in North Carolina certifying that the permitted facility has been installed in accordance
with the NPDES Permit, this Authorization to Construct, and the approved plans and
specifications. The Certification should be submitted to: NCDENR / DWQ, NPDES Unit, 1617 Mail
Service Center, Raleigh, North Carolina 27699-1617.
Requirements for Certified Operator
The Permittee shall employ a certified wastewater treatment plant operator to be in
responsible charge (ORC) of the wastewater treatment facilities. The operator must hold a
certificate of the type and grade at least equivalent to or greater than the classification assigned to
the wastewater treatment facilities by the Certification Commission. The Permittee must also
employ a certified back-up operator of the appropriate type and grade to comply with the
conditions of Title 15A, Chapter 8G, .0200. The ORC of the facility must visit each Class I facility at
least weekly and each Class II, III, and IV facility at least daily, excluding weekends and holidays;
and must properly manage and document daily operation and maintenance of the facility and
comply with all other conditions of Title 15A, Chapter 8G, .0200.
Additional Requirements
The Operational Agreement between the Permittee and the Environmental Management
Commission is incorporated herein by reference and is a condition of this Permit. Noncompliance
with the terms of the Operational Agreement shall subject the Permittee to all sanctions provided
by G. S. 143-215.6 for violation of or failure to act in accordance with the terms and conditions of
this Permit.
Failure to abide by the requirements contained in this Authorization to Construct may
subject the Permittee to an enforcement action by the Division of Water Quality in accordance with
North Carolina General Statute 143-215.6A to 143-215.6C.
The issuance of this Authorization to Construct does not preclude the Permittee from
complying with any and all statutes, rules, regulations, or ordinances which may be imposed by
other government agencies (local, state, and federal) which have jurisdiction.
The Permittee shall maintain a copy of the approved plans and specifications on file for the
life of the facility.
If you have any questions about this Authorization to Construct, please contact Mike
Myers, at [phone], extension 508.
Sincerely,
jictrt:it,,
rr T. Stevens
Director
Enclosures: Engineer's Certification Form
cc: Mr. Robert Difiore, PE Hazen and Sawyer (w/ certification form)
Winston-Salem Regional Office, Water Quality
Technical Assistance and Certification Unit
Point Source Compliance and Enforcement Unit (Permit Modification)
Central Files
NPDES Unit Files

A. (4). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL
Permit No. NC0047384
During the period beginning upon completion of phase III upgrades, and placing aeration tanks 9 through 12, and clarifiers 5 and 6 into service, and lasting until
construction to expand to 30.0 MGD is complete, the Permittee is authorized to discharge from outfall(s) serial number 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
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Sample
Location.
_
Flow
24.0 MGD
Continuous
Recording
I or E
BOD, 5 day, 20°C (April 1 - October 31)2
9.0 mg/I
13.5 mg/I
Daily
Composite
E, I
BOD, 5 day, 20°C (November 1 - March 31)2
18.0 mg/I
27.0 mg/I
Daily
Composite
E, 1
Total Suspended Solids2
30.0 mg/I
45.0 mg/I
Daily
Composite
E, I
NH3 as N (April 1 - October 31)
2.5 mg/I
Daily
Composite
E
NH3 as N (November 1 - March 31)
5.0 mg/I
Daily
Composite
E
Dissolved Oxygen3
Daily'
Grab
E, U, D1, D2
pH4
Daily
Grab
E
Fecal Coliform (geometric mean)
200 / 100 ml
400 / 100 ml
Daily'
Grab
E, U, D1, D2
Temperature °C
Daily'
Grab
E, U, D1, D2
Total Nitrogen (NO2 + NO3 + TKN)
Monthly
Composite
E
Total Phosphorus5
2.0 mg/I
•
Weekly5
Composite
E
Total Residual Chlorine
Daily
Grab
E
Selenium
5.2 µg/l
Weekly
Composite
E
Cadmium
2.1 µg/1
5.0 µg/l
Weekly'
Composite
E, U, D1
Copper
2/Month
Composite
E
Zinc
2/Month
Composite
E
Cyanides
5.2 µg/I
22 µg/l
Weekly
Grab
E
Fluoride
1.9 mg/I
Weekly
Composite
E
Conductivity
Weekly'
Grab
U, D1, D2
Chronic Toxicity?
Quarterly
Composite
E
Notes:
Sample locations: E - Effluent, I - Influent, U - Upstream at Old US Highway 70, D1 - Downstream at SR 2821 (Harvest Road), D2 - Downstream at Huffine Farm
Road.
' Upstream and Downstream monitoring shall be grab samples and shall be conducted three times per week during the months of June, July, August, and
September, and once per week during the remaining months of the year, except for Cadmium, which shall be monitored monthly.
2 The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/I.
4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
5 Total Phosphorous compliance shall be based upon a quarterly average of weekly samples.
6 The quantitation limit for cyanide shall be 10 µg/I (10 ppb). Levels reported as "<10 µg/I" shall be considered zero for compliance purposes.
7 Chronic Toxicity (Ceriodaphnia) at 90%; January, April, July, and October; See Part III, Condition G.

HAZENAND SAWYER
Environmental Engineers & Scientists
April 26, 2000
Mr. Mike Myers
NCDENR - Water Quality Section
1617 Mail Service Center
Raleigh, NC 27699-1617
Hazen and Sawyer, P C.
4011 WestChase Blvd.
Raleigh, NC 27607
919 833-7152
Fax: [phone]
cad�DAPR 2 7 2000
rt r' - GL Mini•
Re: City of Greensboro
T.Z. Osborne WWTP
Interim Increase in Permitted Capacity
Dear Mike:
In response to your questions regarding the above subject we offer the following:
Sludge Management Plan — The City presently utilizes incineration as its
primary sludge disposal option. The fluidized bid incinerator is sized to handle
the average sludge production rate anticipated at the 30 mgd design flow. For
periods of extended outage of the incinerator, sludge is dewatered and hauled
to the City's solid waste landfill. The City is presently evaluating alternatives to
upgrade their older multiple hearth incinerator for additional capacity and back-
up.
Chlorine Contact Tankage — There are presently three (3) chlorine contact
tanks which provide sufficient volume to achieve 48 minutes of contact time at
the permitted flow of 24 mgd. This allows for a peak hourly flow to average flow
ratio of 3.2, well within historical peaking factors. The City utilizes a 3.5 MG
flow equalization tank to ensure peak hourly flows are minimized.
February 2000 Ammonia Violation — There were several factors that contributed
to the February 2000 ammonia violation including:
1) Winter conditions — cold, heavy snow and ice.
2) Melt down allowed high amounts of salt to enter plant.
3) Loss of solids disposal operation allowed for high levels of inert
bacteria to accumulate.
4) Construction activities for current upgrade compounded above
listed problems.
Myers 04.26.00.doc
New York. NY • Armonk, NY • Woodbury, NY • Upper Saddle River. NJ • Detroit, MI • Raleigh. NC • Charlotte, NC • Fairfax, VA • Hollywood, FL • Boca Raton, FL • Fort Pierce, FL • Gainesville, FL • Sarasota, FL • Miami, FL

HAZEN AND SAWYER
Mr. Mike Myers
April 26, 2000
Page 2
We trust the above will allow you to approve the request to increase the permitted
capacity of the T.Z. Osborne WRF to 24 mgd.
Very truly yours,
HAZEN AND SAWYER, P.C.
Robert S. DiFiore, P.E.
Vice President
RSD/jhl
cc: Arthur White
Allan Williams
Alan Stone
Myers 04.26.00.doc

MEMO
Division of Water Quality
Winston-Salem Regional Office
March 10, 2000
Memorandum to: Ms. Susan Wilson
Non -discharge permitting unit
Through: Larry Coble l"J
Water Quality Supervisor
From: Sue White --
Environmental Engineer I
Subject: ATC No: 047384ACF
T.Z. Oborne Reclamation Facilty
Guilford County
MAR 14 2000
This office has received a request to upgrade the T. Z. Osborne Wastewater
Treatment Facility from its current design flow of 22 million gallons per day to 24
million gallons per day. This upgrade is contingent upon the completion of the phase 3
facility. A review of the Osborne WWTP records show that for the past ten months the
average flow of the plant has been 19.01 million gallons per day which is in compliance
with the limits. The average BOD for this time frame was 3.86 while the limit is 20 and
the NH3+NH4 average was .45 with a limit of 5.4. Both BOD and NH3+NH4 were in
compliance.
At this time, we recommend that the request to upgrade the Osborne WWTP be
approved to be effective when the phase 3 facilities of the Osborne WWTP upgrade is on
line.
1

A7A
NCDENR
JAMES B. HUNT JR.
GOVERNOR
BILL HOLMAN
SECRETARY
KERR T. STEVENS
DIRECTOR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
WINSTON-SALEM REGIONAL OFFICE
March 9, 2000
Mr. Arthur White
Wastewater Treatment Manager
PO Box 3136
Greensboro, NC 27402-3136
SUBJECT: Osborne WWTP Upgrade Request
NPDES Permit No.NC0047384
Guilford County
Dear Mr. White:
This office has received a request to upgrade the T. Z. Osborne Wastewater
Treatment Facility from its current design flow of 22 million gallons per day to 24
million gallons per day. This upgrade is contingent upon the completion of the phase
3 facility. A review of the Osborne WWTP records show that for the past ten
months the average flow of the plant has been 19.01 million gallons per day which is
in compliance with the limits. The average BOD for this time frame was 3.86 while
the limit is 20 and the NH3+NH4 average was .45 with a limit of 5.4. Both BOD
and NH3+NH4 were in compliance.
At this time, we recommend that the request to upgrade the Osborne WWTP
be approved to be effective when the phase 3 facilities of the Osborne WWTP
upgrade is on line.
If you have any questions or comments concerning this report, please do not
hesitate to contact Sue White or me at [phone].
Sincerely,
Mr. Larry Coble
Water Quality Supervisor
Cc: WSRO
Central Files
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585 WAUGHTOWN STREET, WINSTON-SALEM, NORTH CAROLINA 27107
PHONE [phone] FAX [phone]
AN EQUAL OPPORTUNITY / AFFIRMATIVE ACTION EMPLOYER - 50% RECYCLED/10% POST -CONSUMER PAPER

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Greensboro WWTP--N. Buffalo
BUFFALO CREEK WATERSHED
Greensboro WWTP--Osborne) -NCuo { 7 3841
A
0.7 0 0.7 1.4 Miles
ATA
NCDENR
Planning Branch
Draft, November 1999
LEGEND
Draft Usc Support Ratings, 11/99
Al Fully Supporting
/V PartiallySupporting
NNot Supporting
^/ Not Rated
NPDES Dischargers
Fhb Community Ratings
- Excellent
A Good
A Good -Fair
• Fair
- Poor
Maaoinvertebrate Community Ratings
• Excellent
• Good
• Good Fair
# Far
• Poor
• Not Rated
• DWQ Ambient Station
-- Municipality

Buffalo Creek Watershed: History.
(1) South Buffalo Creek.
1995 Use Support:
Source to US 70: PS, based on Fair bugs
US 70 to Buffalo: NS, based on Poor bugs and ambient site info (high Cd, NH3)
1998 303(d) List:
Source to US 70: PS, on with sediment as problem parameter
US 70 to Buffalo: NS, on with Cd and NH3 as problem parameters
1999 Use Support:
Source to McConnel Rd: PS, based on Fair bugs
McConnell Rd to US 70: NS, based on Poor bugs and fish
US 70 to Buffalo Cr.: NS, based on Poor bugs and fish and ambient site info (high fecals,
NH3)
**Note**Cd problem has been solved by WWTP
2000 303(d) List (Draft):
Source to McConnell Rd: PS, on with habitat degradation' as cause of impairment
McConnell Rd to US 70: NS, on with habitat degradation as cause of impairment
US 70 to Buffalo Cr: NS, on with habitat degradation and NH3 as cause of impairment
(2) North Buffalo Creek.
1995 Use Support:
Source to WWTP: NS, based on ambient data (NH3, fecals) and old bug data (Poor)
WWTP to Buffalo: NS, based on old bug data (Poor)
1998 303(d) List
Source to WWTP: NS, on with NH3 and fecals as problem parameter
WWTP to Buffalo: not on list, due to old bug data prompting NS rating
1999 Use Support
Source to WWTP: NS, based on bug data (Poor)
WWTP to Buffalo: NS, based on fish and bug data (Poor) and ambient site info (fecals,
NH3)
2000 303(d) List (Draft)
Source to WWTP: NS, on with habitat degradation and fecals as cause of impairment
WWTP to Buffalo: NS, on with habitat degradation and NH3 as cause of impairment
' Habitat degradation includes sediment

NORTH CAROLINA DEPARTMENT OF ENVIRONMENT
AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
January 22, 1998
MEMORANDUM
TO: Bethany Bolt
NPDES Unit
FROM: Steve Mauney
SUBJECT: NPDES Minor Permit Modification
Permit No. NC0047384
City of Greensboro
T.Z. Osborne WWTP
Guilford County
oriaggE
A AAl
281998
POINT SOURCE BRANCH
A meeting was held on 12-16-97, with Allan Williams, Arthur White, Martie Groome,
Bob Diflore, Allan Stone (representing Greensboro) and Don Safrit, Dave Goodrich, Larry
Coble, Beth Morton and myself.
As indicated in the meeting and in Greensboro's letter of 12-23-97, upon completing
Phase II they will have 50% more primary settling tank capacity, 50% more final settling tank
capacity, 40% more blower capacity, seven return activated sludge pumps (compared to 4
initially), and better preliminary treatment capability. These items should help them to achieve a
much higher level of treatment.
It is recommended that the permit capacity be changed to 22 MGD. Please call if any
questions.
cc: WSRO
Central Files