NC0024325_Permit (Modification)_20080227

NPDES DOCUMENT SCANNING' COVER SHEET
NPDES Permit:
NC0024325
North Buffalo Creek WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Staff Report
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
February 27, 2008
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ATA
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Michael F. Easley, Governor William G. Ross, Jr., Secretary
Coleen H. Sullins, Director
February 27, 2008
Allan Williams, Director of Water Resources
City of Greensboro
2199 White Street
Greensboro, NC 27405
Subject: Modification of NPDES Permits NC0024325 and NC0047384
North Buffalo WWTP and T.Z. Osborne WWTP
Guilford County
Dear Mr. Williams:
The Division of Water Quality has received and reviewed the Town's minor permit modification requests for
NPDES permits NC0024325 and NC0047384 dated February 12, 2008, for North Buffalo WWTP and T.Z.
Osborne WWTP. In response to your request, the subject NPDES permits have been modified to reflect the
following:
• Footnote 8 within Condition A. (1.) of each permit, has been changed to reflect a quantitation limit
for cyanide at 20 µg/L.
Please find enclosed the revised pages, which should be inserted into each respective permit. The old pages
may then be discarded. All other terms and conditions contained in the original permits remain unchanged
and in full effect. These permit modifications are issued under the requirements of North Carolina General
Statutes 143-215.1 and the Memorandum of Agreement between North Carolina and the U.S.
Environmental Protection Agency.
If you have any questions concerning these permit modifications, please contact Vanessa Manuel of the
Eastern NPDES Program at [phone], extension 532.
cc: DWQ/SWP Central Files
DWQ/SWP Winston-Salem Regional Office
NPDES Unit
Sincerely,
Ar7c,w
Coleen H. Sullins
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
512 N. Salisbury St., Raleigh, North Carolina 27604
Phone: [phone] / FAX [phone] / Internet: h2o.enr.state.nc.us
An Equal Opportunity/Affirmative Action Employer — 50% Recycledll0% Post Consumer Paper
NorthCarolina
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Permit NC0024325
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful
standards and regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended, the
City of Greensboro
is hereby authorized to discharge wastewater from a facility located at the
North Buffalo WWTP
2199 White Street, Greensboro
Guilford County
to receiving waters designated as North Buffalo Creek in the Cape Fear River Basin in
accordance with effluent limitations, monitoring requirements, and other conditions set forth
in Parts I, II and III hereof.
The permit shall become effective March 1, 2008.
This permit and the authorization to discharge shall expire at midnight on June 30, 2011.
Signed this day February 27, 2008.
�c v
Coleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NC0024325
A. (1) EFFLUENT LIMITS AND MONITORING REQUIREMENTS - FINAL
Beginning on March 1, 2008, and lasting until June 30, 2011, the permittee is authorized to discharge treated wastewater
from outfall 001. Such discharges shall be limited and monitored by the permittee as specified below:
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
EFFLUENT
CHARACTERISTICS
Monthly
Average
Weekly
Average
Daily
Maximum .
Measurement
Frequency
Sample Type
Sample Location
Flow
16.0 MGD
Continuous
Recording
Influent or Effluent
Total Monthly Flow (MG)
Monitor and Report
Monthly
Recorded or
Calculated
Influent or Effluent
CBOD, 5-day, 20°C (Summer)2
8.0 mg/L
12.0 mglL
Daily
_ Composite
Influent & Effluent
CBOD, 5-day, 20°C (Winter)2
16.0 mg/L
24.0 mg/L
Daily
Composite
Influent & Effluent
Total Suspended Solids2
30.0 mglL
45.0 mg/L
Daily
Composite
Influent & Effluent
NH3 as N (Summer)
4.0 mglL
12.0 mglL
Daily
Composite
Effluent
NH3 as N (Winter)
8.0 mg/L
24.0 mg!L
Daily
Composite
Effluent
Fecal Coliform (geometric mean)
200/100 mL
400/100mL
-
Daily
Grab
Effluent
Dissolved 0xygen3
Daily
Grab
Effluent
Temperature°C
Daily
Grab
Effluent
pH4
Daily
Grab
Effluent
Total Nitrogen (NO2+NO3+TKN)5
Weekly
Composite
Effluent
Total Phosphoruss
2.0 mg/L quarterly averages
Weekly
Composite
Effluent
Chronic Toxicity?
Quarterly
Composite
Effluent
Total Cyanide8
5.2 pg/L
22.0 pg/L
Weekly
Grab
Effluent
Total Chromium
51.0 pg/L
1022.0 pglL
Weekly
Composite
Effluent
Total Nickel
91.0 pglL
261.0 pg/L
Weekly
Composite
Effluent
Total Mercury9
0.012 pg/L
Weekly
Grab9
Effluent
Total Copper
2/Month
Composite
Effluent
Total Zinc
2/Month
Composite
Effluent
Total Iron
Monthly
Composite
Effluent
Total Selenium
Quarterly
Composite
Effluent
Fluoride*
1.9 mg/L
-
Weekly
Composite
Effluent
Chloride
Quarterly
Composite
Effluent
Dissolved Oxygenic'
10
Grab
U, D1, D2, D3
Fecal Coliformlo
10
Grab
U, D1, D2, D3
-
Temperature°C19
10
Grab
U, D1, D2, D3
Conductivity19
10
Grab
U, D1, D2, D3
Total Residual Chlorine'
17.0 pg/L
Daily
Grab
Effluent
TKN (mg/L)
Monitor and Report
Weekly
Composite
Effluent
NO3-N + NO2-N (mg/L)
Monitor and Report
Weekly
Composite
Effluent
TN Load12
Monitor and Report (Ib/mo)
Monitor and Report (Ib/yr)
Monthly
Annually
Calculated
Calculated
Effluent
Effluent
TP Load12
Monitor and Report (Ib/mo)
Monitor and Report (Ib/yr)
Monthly
Annually
Calculated
Calculated
Effluent
Effluent
Effluent Pollutant Scan
See A. (5)
Notes:
1. U: Upstream at the influent conduit. D1: Downstream at the unimproved road 0.8 miles east of White/Nealtown
Road intersection. D2: Downstream at Rankin Mill Road. D3: Downstream in Buffalo Creek at McCleansville
Road.

r
Permit NC0024325
2. The monthly average effluent CBOD5 and TSS concentrations shall not exceed 15% of the respective influent
value (85% removal).
3. The daily effluent dissolved oxygen concentration shall not be less than 6.0 mg/L.
4. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
5. TN nutrient limit required by HB 515 is deferred until results of nutrient response modeling effort are completed.
6. Compliance shall be based on a quarterly average of weekly samples, with quarterly periods defined as January -
March, April June, July -September, and October -December.
7. Chronic Toxicity (Ceriodaphnia) at 90% with testing in January, April, July and October (see Special Condition A. (2)).
8. The quantitation limit for cyanide shall be 20 pg/L; levels reported below 20 pg/L shall be considered
zero for compliance purposes.
9. Effluent samples must be analyzed by an EPA -approved low level mercury analysis method.
10. Instream monitoring requirements are waived as long as facility retains membership in the UCFRBA. If
membership is cancelled, facility will monitor 3/Week (June -September) and 1/Week (October -May). Stream
sampling may be discontinued at such times as flow conditions in the receiving waters or extreme weather
conditions will result in a substantial risk of injury or death to persons collecting samples. Upon such
discontinuance, stream sampling shall be resumed at the first opportunity after the risk period has ceased.
(Summer): April 1- October 31, (Winter): November 1 - March 31
(Daily): every day on which a wastewater discharge occurs except Saturdays, Sundays, and legal holidays unless
otherwise specified by the Director.
11. Facility is allowed 24 months from the effective date of the permit to comply with the total residual chlorine limit.
This time period is allowed in order for the facility to budget and design/construct the dechlorination and /or
alternative disinfection systems.
12. TN or TP Load is the mass quantity of Total Nitrogen or Phosphorus discharged in a given period of time. See
Special Condition A.(4), Calculation of Mass Loads.
* The limit might be removed if the facility submits 12 month of data that shows no reasonable potential to exceed the
water quality standard.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Michael F. Easley, Governor
WilliamG. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen Sullins, Director
Division of Water Quality
February 15, 2008
MARTIE GROOME
LABORATORY & INDUSTRIAL WASTE SECTION SUPERVISOR
CITY OF GREENSBORO
WATER RESOURCES DEPT
BOX 3136
GREENSBORO NC 27402-3136
Subject: Acknowledgement of Permit Modification Application Number
NPDES Permit NC0024325-North Buffalo POTW
NPDES Permit NC0047384-T.Z. Osborn POTW
Guilford County
Dear Mr./Ms. Groome:
The Division of Water Quality, Point Source Branch, acknowledges receipt of your permit modification application
with supporting information on February 13, 2008. This letter is to inform you of a change in reviewers.
The reviewer will perform a detailed review and contact you with a request for additional information if necessary. To
ensure the maximum efficiency in processing permit applications, the Division requests your assistance in providing a
timely and complete response to any additional information requests.
Please note that the new assigned reviewer is Vanessa Manuel. If you have any questions, please contact Vanessa
Manuel at 919-733-5083 ext. 532 or via email at [e-mail] . If the she is unavailable, you may
leave a message, and she will respond promptly.
PLEASE REFER TO THE ABOVE APPLICATION NUMBER WHEN MAKING INQUIRES ON THIS
PROJECT.
Sincerely,
Arti
Laurie Singleton
Point Source Branch
Cc: Central File
Winston-Salem Regional Office Surface Water Protection Section
Permit application file NC0024325 and NC0047384
None Carolina
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North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone]
Internet: www.ncwaterquality.org
Customer Service
Location: 512 N. Salisbury St. Raleigh, NC 27604 Fax [phone]
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Request for NPDES Permit Modification for North Buffalo and TZ 0...
Subject: Request for NPDES Permit Modification for North Buffalo and TZ Osborne POTWs
From: "Groome. Martie" <[e-mail]>
Date: Tue, 12 Feb 2008 13:26:12 -0500
To: "Gil Vinzani" <[e-mail]>
CC: "Howard, Don" <[e-mail]>, "Matt Matthews"
<matt.matthews a ncmail.net>, "Kling, Walter" <[e-mail]>, "Hicks, Barbara"
<Barbara.Hicks @greensboro-nc.gov>
Gil,
As per recent conversations with Matt Matthews and in response to the submittal of a site -specific cyanide
quantitation level study, the City of Greensboro hereby requests NPDES permit modifications for the North
Buffalo POTW (NPDES #NC0024325) and the T.Z. Osborne POTW (NPDES #NC0047384). The permit
modifications would change the current cyanide quantitation levels in each permit from 10 ug/I to 20 ug/I.
Thank you for your assistance in this matter. Please let me know if there are any other administrative
details that I need to complete in order to facilitate and expedite these modifications.
If you need additional information, please feel free to contact me.
Martie Groome
MARTIE GROOME
LABORATORY AND INDUSTRIAL WASTE SECTION SUPERVISOR
CITY OF GREENSBORO WATER RESOURCES DEPARTMENT
Box 3136
GREENSBORO NC 27402-31 36
PHONE: [phone]
FAX: [phone]
EMAIL: [e-mail]
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Please note that email sent to and from this address is subject
to the North Carolina Public Records Law and may be disclosed to
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