NC0021024_permit modification_19980605

NPDES DOCUMENT SCANNING COVER SHEET
NPDES Permit:
NC0021024
Roxboro WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Speculative Limits
Correspondence
re:
Instream Assessment (67B)
Environmental Assessment (EA)
Permit
History
Document Date:
June 5, 1998
This document is px- mmted oa remorse paper - igimore say
coateat oa time resrerse side

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
Mr. Andrew C. Oakley
Superintendent of Plants
City of Roxboro
105 S. Lamar Street
P.O. Box 128
Roxboro, North Carolina 27573
Dear Mr. Oakley:
Ai • •
D E R
June 5, 1998
/
Subject: NPDES Permit Modification
Permit No. NCO021024
City of Roxboro WWTP
Person County
A permit modification request and check for $100.00 (#036154) was received by the NPDES Unit on May 4, 1998. After review
of the request, the modification to your NPDES permit has been approved.
In light of information available regarding cyanide measurement techniques, the Division feels it is reasonable to specify the total
cyanide quantitation limit as 10 µg/I (10 ppb) as of July 1, 1998 in your NPDES permit. Levels reported as "<10 µg/I" will be
considered zero for compliance purposes.
Please find enclosed the amended Effluent Limitations pages for outfall 001, which should be inserted into your permit. The old
effluent page should be discarded. All other terms and conditions contained in the original permit remain unchanged and in full
effect. 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.
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 in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and 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.
If you have any questions regarding this modification to your permit, please contact Bethany Bolt at [phone], Ext. 551.
Sincerely,
n� ' /
Preston Howard, Jr., P.E.
cc: Central Files Raleigh Regional Office/Water Quality Section
NPDES Unit EPA/Roosevelt Childress
Pretreatment Unit . Point Source Compliance Enforcement Unit
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
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A. (la). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL
Permit No. NCO021024
During the period beginning on the effective date of the permit and lasting until June 30, 1998, 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:
EFFLUENT'.CHARACTERISTICS i `
LIMITS
MONITORING REQUIREMENTS
Monthly
; Avera a
Weekly -
Average
Daily
Maximum
Measurement
Frequency
Sample
e,
Sample
Location'
Flow
5.0 MGD
Continuous
Recording
1 or E
BOD 5 day,20°C (April 1 - October 31 2
16.0 mg/I
24.0 mg/1
Daily
Composite
E, I
BOD 5 day, 20°C November 1 - March 31 2
20.0 mg/l
30.0 mg/1
Daily
Composite
E, I
Total Suspended Solids3
30.0 mg/1
45.0 mg/1
Daily
Composite
E, I
NH3 as N (April 1 - October 31)
5.0 mg/1
Daily
Composite
E
NH3 as N (November 1 - March 31)
13.0 mg/1
Daily
Composite
E
Dissolved Oxygen4
Daily'
Grab
E, U, D
H5
Daily
Grab
E
Fecal Coliform(geometric mean
200 100 ml
400 100 ml
Daily
Grab
E
Temperature °C
Dail t
Grab
E, U, D
Total Nitrogen (NO2 + NO3 + TKN)
Monthly
Composite
E
Total Phosphorus
Monthly
Composite
E
Total Residual Chlorine
Daily
Grab
E
Conductivity
Daily
Grab
U 7 D
Antimony
6.5 mg/1
Weekly
Composite
E
Cyanide
5.0 µg/1
Weekly
Grab
E
Lead
25.0 µg/I
Weekly
Composite
E
Nickel
88.0 µg/1
Weekly
Composite
E
Selenium
2/Month
Composite
E
Chronic Toxicity6
Quarterly
I Composite
I E
Notes:
" Sample locations: E - Effluent, I - Influent, U - Upstream 100 feet of discharge, D - Downstream at NCSR 1322.
i Instream monitoring shall be grab samples taken 3/week (June -September) and 1/week (October -May).
2 The monthly average effluent BOD5 concentration shall not exceed 15% of the respective influent value (85% removal).
3 The monthly average effluent Total Suspended Solids concentration shall not exceed 40% of the respective influent value (60% removal).
4 The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/l.
5 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
6 Chronic Toxicity (Ceriodaohnia), P/ F, 90%; March, June, September, and December; See Supplement to Effluent Limitations and Monitoring
Requirements Page, Special Conditions for flow of 5.0 MGD.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A. (lb). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NCO021024
During the period beginning July 1, 1998 and lasting until expiration, 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:
EFFLUENT CHARACTERISTICS
LIMITS
".MONITORING REQUIREMENTS°
Monthly '
Average r,
Weekly
Average
Daffy
Maximum'
Measurement
Frequency
Sample
Type .
Sample
'Location*
Flow
5.0 MGD
Continuous
Recording
I or E
BOD 5 day, 20°C (April 1 - October 31)2
16.0 mg/1
24.0 mg/1
Daily
Composite
E, I
BOD, 5 day, 20°C November 1 - March 31)2
20.0 mg/1
30.0 mg/1
Daily
Composite
E, I
Total Suspended Solids3
30.0 mg/1
45.0 mg/1
Daily
Composite
E, I
NH3 as N (April 1 - October 31)
5.0 mg/1
Daily
Composite
E
NH3 as N (November 1 - March 31)
13.0 mg/1
Daily
Composite
E
Dissolved Oxygeni
Daily'
Grab
E, U, D
H5
Daily
Grab
E
Fecal Coliform(geometric mean
200 100 ml
400 100 ml
Daily
Grab
E
Temperature °C
Daffy'
Grab
E, U, D
Total Nitrogen (NO2 + NO3 + TKN)
Monthly
Composite
E
Total Phosphorus
Monthly
Composite
E
Total Residual Chlorine
Daily
Grab
E
Conductivity
Daily
Grab
U t D
Antimony
6.5 m I
Weekly
Composite
E
C anide6
5.0 µg/1
Weekly
Grab
E
Lead
25.0 µg/I
Weekly
Composite
E
Nickel
88.0 µg/l
Weekly
Composite
E
Selenium \
2 Month
Composite
E
Chronic Toxicity7j
Quarterly
I Composite
E
((Notes:/
Sample locations: E - Effluent, I - Influent, U - Upstream 100 feet of discharge, D - Downstream at NCSR 1322.
i Instream monitoring shall be grab samples taken 3/week (June -September) and 1/week (October -May).
2 The monthly average effluent BOD5 concentration shall not exceed 15% of the respective influent value (85% removal).
3 The monthly average effluent Total Suspended Solids concentration shall not exceed 40% of the respective influent value (60% removal).
4 The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/l.
5 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
6 The quantitation limit for cyanide shall be 10 µg/1 (10 ppb). Levels reported as "<10 µg/1" shall be considered zero for compliance purposes.
7 Chronic Toxicity (Ceriodaphnia), P/F, 90%; March, June, September, and December; See Supplement to Effluent Limitations and Monitoring
Requirements Page, Special Conditions for flow of 5.0 MGD.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

David A. Goodrich
N. C. D. E. N. R.
P. O. Box 29535
Raleigh, North Carolina
Dear Mr. Goodrich:
City o f cRROJOzo
27626-0535
April 22, 1998
C��\er)
0a3GiSy
00,06
�Ot7'
In November 1997, the City of Roxboro requested a revision of NPDES
Permit #NCO021024 to raise cyanide limits (copy attached). Since that time our
cyanide discharges have improved. However, we still, at times, find discharge
amount of CN at above 5ug/L. That leaves us vulnerable to suits by groups such
as the "American Canoe Association."
I have been told that our limit can be raised to l Oug/L if we submit the
necessary $100. re -opening fee.
The City of Roxboro hereby requests that DENR disregard the previous
request and accept the enciosed check and raise the permit limit on cyanide
discharge to I Oug/L.
Respectfully Submitted,
�QL .
NA U I Ioo � Andrew C. Oakley
POINT SOURCE g Superintendent of Plants
RANCH
ACO/cmb
105 S. LAMAR STREET • P. O. BOX 128 • ROXBORO. NORTH CAROLINA 27573 • [phone] • FAX [phone]