NC0043532_Permit (Issuance)_19980803

NPDES DOCUMENT :MCANNINO COVER SHEET
NPDES Permit:
NC0043532
West Stanly / Oakboro WWTP
11^•c: -.
Document Type: ;Permit
Issuan
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
August 3, 1998
This document is printed on reuse paper - ignore any
content on the rezrerse 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
The Honorable Joyce Little, Mayor
Town of Oakboro
P.O. Box 610
109-A North Main Street
Oakboro, North Carolina 28129-0610
•e1 FA
DENR
August 3, 1998
Subject: NPDES Permit Issuance
Permit No. NC0043532
Town of Oakboro WWTP
Stanly County
Dear Mayor Little:
In accordance with your request for an expansion from 0.5 MGD to 0.9 MGD and approved
Environmental Analysis received by the Division on August 21, 1997, we are forwarding herewith the
subject permit to discharge under the subject state - NPDES permit. This permit 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 and as subsequently
amended.
The following change has been made to the above referenced permit:
• Limits pages have been included for 0.5 MGD and 0.9 MGD flows at both discharge points.
• The effluent limits pages for 0.9 MGD were written according to speculative limits developed for the
town July 28, 1994: BOD limits are 11.0/18.0 mg/1(summer/winter), NH3 limits are 2.0/6.0,
Dissolved Oxygen must be greater than 5 mg/1, and a Total Residual Chlorine limit of 28 µg/1 were
given in order to achieve a BODuitimate demand on the receiving waters of less than 32.0 mg/1.
• Removed limits for chromium, nickel, lead and arsenic per Reasonable Potential (RP) analysis at the
Long Creek discharge point, outfall 001.
• Removed limits for chromium, nickel, lead, mercury, cyanide, and arsenic per RP to the Rocky River,
outfall 002.
• The monitoring frequencies for toxicants were changed to twice a month if the limit was removed.
It is the Divisions understanding that upon relocation to the Rocky River, the facility will use outfall
001, Long Creek, as a gravity discharge only in cases el failure of the pump station or force main that would
prevent discharge to outfall 002, the Rocky River. A kable valve box with manually turned weir plates
will be installed at the 001 discharge pipe after relocation.
If any parts, measurement frequencies or sampling requirements contained in this permit 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.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Fermi Onnertunity Affirmative Action Emnlnver 50% recycled/ 10% cost -consumer pacer

Permit Issuance
Permit No. NC0043532
Town of Oakboro WWTP
August 3, 1998
Please take notice that this permit is not transferable except after notice to the Division of Water
Quality. Part II, E.4. addresses the requirements to be followed in case of change in ownership or control of
this discharge. The Division of Water Quality may require modification or revocation and reissuance of the
permit.
This permit does not affect the legal requirements to obtain other permits which may be required by
the Division of Water Quality or permits required by the Division of Land Resources, the Coastal Area
Management Act or any other Federal or Local governmental permit that may be required. If you have any
questions concerning this permit, please contact Mary Cabe at telephone number [phone], ext. 518.
Sincerely,
Original Signed By
David A. Goodrich
A. Preston Howard, Jr., P. E.
cc: Central Files
Mr. Roosevelt Childress, EPA
Mooresville Regional Office / Water Quality Section
NPDES Unit
Point Source Compliance Enforcement Unit
Mr. David Dickenson, P.E.
Engineering Services, PA
518 Village Court
P.O. Box 1849
Garner, NC 27529

1
'r
I.
Permit No. NC0043532
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 provision 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 Town of Oakboro
is hereby authorized to discharge wastewater from a facility located at
Oakboro Wastewater Treatment Plant
Off of NCSR 1953
East of Oakboro
Stanly County
to receiving waters designated as Long Creek (outfall 001) and the Rocky River (outfall 002)
in the Yadkin -Pee Dee River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in
Parts I, II, III, and IV hereof.
This permit shall become effective September 1, 1998.
This permit and authorization to discharge shall expire at midnight on November 30,1999.
Signed this day August 3, 1998.
Original Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

4
r
f
Permit No. NC0043532
SUPPLEMENT TO PERMIT COVER SHEET
The Town of Oakboro
is hereby authorized to:
1. Continue to operate a 0.50 MGD wastewater treatment plant consisting of a manual bar screen,
an aerated grit chamber, influent pump station, instrumented flow measurement, aeration basin
with mechanical aerators, dual secondary clarifiers, chlorine contact basin, dual aerated sludge
digesters, aerated sludge holding basin, dual sludge drying beds, and a standby electric
generator located at the Town of Oakboro WWTP, off of NCSR 1953, east of Oakboro, Stanly
County (See Part III of this Permit), and
2. Construct facilities for relocation of the outfall to the Rocky River (002), and
3. After receiving an Authorization to Construct from the Division of Water Quality, construct
facilities for expansion of the wastewater treatment plant to 0.9 MGD with discharge to the
Rocky River (Outfall 002), and
4. To continue to discharge from said treatment works at the location specified on the attached
map into Long Creek (001), and upon relocation to discharge to the Rocky River (002). Both
locations are classified C waters in the Yadkin -Pee Dee River Basin.

Town of Oakboro - NC0043532
Discharge Point (001)
Existing: Latitude:
Longitude:
Proposed Latitude:
Longitude:
35°14'08"
80°16'00"
35°12'41"
80°15'16"
ROAD CLASSIFICATION
PRIMARY HIGHWAY
HARD SURFACE
LIGHT -DUTY ROAD, HARD OR
IMPROVED SURFACE
HARD SURFACE Ar UNIMPROVED ROAD
Latitude 35°12'41 ° Longitude 80°15'16°
Map # G17NE Sub -basin 03-07-13
Stream Class C
Discharge Class Industrial/Domestic
Receiving Stream Rocky River
Design Q 0.9 MCA Permit expires 11/ 30/99
SCALE 1:24 000
0
1'•
1 MILE
0
1
•
7000 FEET
0
1 KILOMETER
CONTOUR INTERVAL 10 FEET
Town of Oakboro WWTP
NC0043532
Stanly County •

A.(1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0043532
During the period beginning ON THE EFFECTIVE DATE OF THE PERMIT AND LASTING UNTIL RELOCATION TO THE ROCKY RIVER, EXPANSION OR
UNTIL EXPIRATION, the Permittee is authorized to discharge from outfall serial number 001 (Long Creek). After relocation to the Rocky River, this outfall may
be used as an emergency backup outfall, in case of pump station failure. Such discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT CHARACTERISTICS
LIMITS
°` MONITORING `REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location1
Flow
0.5 MGD
Continuous
Recording
I or E
BOD, 5 day, 20°C2
30.0 mg/I
45.0 mg/I
3/week
Composite
E, I -
Total Suspended Residue2
30.0 mg/I
45.0 mg/l
3/week
Composite
E, I
NH3 as N (April 1 - October 31)
4.0 mg/l
3/week
Composite
E
NH3 as N (November 1 - March 31) _
14.0 mg/I
3/week
Composite
E
Dissolved Oxygen3
3lweek
Grab
E, U, D+
pH4
3/week
Grab
E
Fecal Conform (geometric mean)
200 / 100 ml
400 / 100 ml
3/week
Grab
E, U, D+
Total Residual Chlonne
3/week
Grab
E
Total Nitrogen (NO2 + NO3 + TKN)
Quarterly
Composite
E
Total Phosphorus
Quarterly
Composite 1
E
Temperature uC
Daily
Grab
E
Temperature vC
3/week
Grab
U, D+
Conductivity
3/week
Grab
-
U, D+
Chronic Toxicity5
Quarterly
Composite
E
Arsenic
2/Month
Composite
E
Chromium
2/Month
Composite
E
Nickel
2/Month
Composite
Lead
2/Month
Composite
E
Cyanide
26 pg/I
Weekly
Grab
E
Copper
2/Month
Composite
E
Zinc
2/Month
Composite
E
Silver
2/Month
Composite
E
Mercury5
0.063 pg/I
Weekly
Composite
E
motes:
'Sample locations: E - Effluent, 1- Influent, U - Upstream at least 100 feet above the discharge point, D - Downstream below the discharge point at NCSR
1917.
+ Instream samples shall be grab samples and shall be collected 3/week during the months of June through September and once per week during the
remaining months of the year.
2 The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective influent value (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be Tess than 6.0 Mg/I.
4 The pH shall not be Tess than 6.0 standard units nor greater than 9.0 standard units.
5 Chronic Toxicity (Ceriodaphnia) P/F at 19%; January, April, July, and October, See Special Conditions page, B.1.
s The detection limit for mercury is 0.2 Ng/I. If the measured level of mercury is below the detection limit, then the measurement is considered to be zero for
the purpose of compliance evaluation and should be reported on the DMR as < 0.2 pg/l.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A.(2) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0043532
During the period beginning UPON RELOCATION TO THE ROCKY RIVER AND LASTING UNTIL EXPANSION OR EXPIRATION, the Permittee is authorized
to discharge from outfall serial number 002 (Rocky River). Such discharges shall be limited and monitored by the Permittee as specified below:
'EFFLUENT CHARACTERISTICS" `.
' LIMITS
► `MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location
Flow
0.5 MGD
Continuous
Recording
I or E
BOD, 5 day, 20°C2
30.0 mg/i
45.0 mg/I
3/week
Composite
E, I
Total Suspended Residue2
30.0 mg/l
45.0 mg/l
3/week
Composite
E, I
NH3 as N (April 1 - Oct, `'77---
30.0 mg/I
3lweek
Composite
E
NH3 as N (November t.. -. _, ' t:: 31)
3lweek
Composite
E
Dissolved Oxygen3
3lweek
Grab
E, U, D+
pH4
3lweek
Grab
E
Fecal Coliform (geometric mean)
200 / 100 ml
400 / 100 ml
3/week
Grab
E, U, D+
Total Residual Chlorine
3/week
Grab
E
Total Nitrogen (NO2 + NO3 + TKN)
Quarterly
Composite
E
Total Phosphorus
Quarterly
Composite
E
Temperature gC
Daily
Grab
E
Temperature "C
3lweek
Grab
U, D+
Conductivity
3/week
Grab
U, D+
Chronic Toxicity5
Quarterly
Composite
E
Arsenic
2/Month
Composite
E
Chromium
2/Month
Composite
E
Nickel
2/Month
Composite
E
Lead
2/Month
Composite
E
Cyanide
2/Month
Grab
E
Copper
2/Month
Composite
E
Zinc
2/Month
Composite
E
Silver
2/Month
Composite
E
Mercury
2/Month
Composite
E
Notes:
r Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above the discharge point, D - Downstream 1.7 miles below the discharge point
(at the end of or close to NCSR 1659).
+ Instream samples shall be grab samples and shall be collected 3/week during the months of June through September and once per week during the
remaining months of the year.
2 The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective influent value (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be Tess than 6.0 mg/I.
4 The pH shall not be Tess than 6.0 standard units nor greater than 9.0 standard units.
Chronic Toxicity (Ceriodaphnia) P/F at 2.6%; January, April, July, and October See Special Conditions page, B.2.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A.(3) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0043532
During the period beginning, UPON EXPANSION AND LASTING UNTIL RELOCATION TO THE ROCKY RIVER OR EXPIRATION, the Permittee is authorized
to discharge from outfall serial number 001 (Long Creek). Such discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT CHARACTERISTICS'°, ,
t f :
. .... • ::
LIMITS
MONITORING REQUIREMENTS
Monthly
� Average
Weekly
� -,
Average
Daily
Maximum mu m
ax
Measurement
Frequency
Sample
- Type ..
Sample
Locat ion1
Flow
0.9 tVIGD
Continuous
Recording
I or E
BOD, 5 day, 20°C2 (April 1 - October 31)
9.0 mg/I
13.5 mg/I
3/week
Composite
E, I
BOD, 5 day, 20°C2 (November 1 - March 31)
18.0 mg/I
27.0 mg/I
3/week
Composite
E,
Total Suspended Residue2
30.0-mg/I
45.0 mg/I
3/week
Composite
E,
NH3 as N (April 1 - October 31)
2.8 mg/l
- 3/week
Composite
E
NH3 as N (November 1 - March Si)
6.0 mg/I
3/week
Composite
E
Dissolved Oxygen3
3lweek
Grab
E, U, D+
pH4
3/week
Grab
_
E
Fecal Colitorm (geometnc mean,-
200 / 100 ml
400 / 100 ml
3/week
Grab
E, U, D+
Total Residual Chlorine
28 pg/I
3lweek
Grab
E
Total Nitrogen (NO2 + NO3 + TKN)
Quarterly
Composite
E
Total Phosphorus
Quarterly
Composite
E
Temperature " C
Daily
Grab
E
Temperature " C
3/week
Grab
U, D+
Conductivity
3/week
Grab
U, D+
Chronic Toxicity°
Quarterly
Composite
E
Arsenic
2/Month
Composite
E
Chromium
2/Month
Composite
E
Nickel
2/Month
Composite
E
Lead
2/Month
Composite
E -
Cyanide
17 pg/i
Weekly
Grab
E
Copper
2/Month
Composite
E
Zinc
2/Month
Composite
E
Silver
2/Month
Composite
E
Mercury°
0.040 pg/I
Weekly
Composite
E
Notes:
Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above the discharge point, D - Downstream 1.7 miles below the discharge point
(at the end of or close to NCSR 1917).
+ Instream samples shall be grab samples and shall be collected 3/week during the months of June through September and once per week during the
remaining months of the year.
2 The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective influent value (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be Tess than 5.0 mgll.
4 The pH shall not be Tess than 6.0 standard units nor greater than 9.0 standard units.
5 Chronic Toxicity (Ceriodaphnia) P/F at 30%; January, April, July, and October, See Special Conditions page, B.3.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
o The detection limit for mercury is 0.2 pg/I. If the measured level of mercury is below the detection limit, then the measurement is considered to be zero for
the purpose of compliance evaluation and should be reported on the DMR as < 0.2 pg/I.

A.(4) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0043532
During the period beginning UPON EXPANSION AND RELOCATION TO THE ROCKY RIVER AND LASTING UNTIL EXPIRATION, the Permittee is
authorized to discharge from outfall serial number 002 (Rocky River). Such discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT CHARACTERISTICS £::
r -
- LIMITS
.
•-` MONITORING REQUIREMENTS •
Monthly
r Average ..
Weekly -
. • Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location1
Flow
0.9 MGD
Continuous
Recording
I or E
BOD, 5 day, 20°C2 (April 1 - October 31)
11.0 mg/l
16.5 mg/I
3/week
Composite
E, I
BOD, 5 day, 20°C2 (November 1 - March 31)
18.0 mg/I
27.0 mg/l
3lweek
Composite
E, I
Total Suspended Residue2
30.0 mg/l
45.0 mg/l
3lweek
Composite
E, 1
NH3 as N (April 1 - October 31)
2.0 mg/l
3lweek
Composite
• E
NH3 as N (November 1 - March 31)
6.0 mg/I
3lweek
Composite
E
Dissolved xygen3
3lweek
Grab
E, U, D+
pH4
3/week
Grab
E
Fecal Coliform (geometric mean)
200 / 100 ml
400 / 100 ml
3lweek
Grab
E, U, D+
Total Residual Chlorine
28 pg/1
3/week
Grab
E
Total Nitrogen (NO2 + NO3 + TKN)
Quarterly
Composite
E
Total Phosphorus
Quarterly
Composite
E
Temperature " C
Daily
Grab
E
Temperature " C
3/week
Grab
U, D+
Conductivity
3/week
Grab
U, D+
Chronic Toxicity5
Quarterly
Composite
E
Arsenic
2/Month
Composite
E
Chromium
2/Month
Composite
E
Nickel
2/Month
Composite
E
Lead
2/Month
Composite
E
Cyanide
2/Month
Grab
E
Copper
2/Month
Composite
E
Zinc
2/Month
Composite
E
Silver
2/Month
Composite
E
Mercury
2/Month
Composite
E
Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above the discharge point, D - Downstream 1.7 miles below the discharge point
(at the end of or close to NCSR 1659).
+ Instream samples shall be grab samples and shall be collected 3/week during the months of June through September and once per week during the
remaining months of the year.
2 The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective influent value (85% removal).
3 The daily average r!i^^n!ved oxygen effluent concentration shall not be less than 5.0 mg/I.
4 The pH shall not b* an 6.0 standard units nor greater than 9.0 standard units.
Chronic Toxicity (Ceriodaphnia) P/F at 4.6%; January, April, July, and October; See Special Conditions page, B.4.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

4 1
Permit No. NC0043532
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
B.1. CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised November 1995, or subsequent
versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant
mortality is 19.0% (defined as treatment two in the procedure document). The permit holder shall perform
quarterly monitoring using this procedure to establish compliance with the permit condition. The tests will be
performed during the months of January, April, July and October. Effluent sampling for this testing
shall be performed at the NPDES permitted final effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TGP3B.
Additionally, DWQ Form AT-1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of Water Quality
4401 Reedy Creek Road
Raleigh, North Carolina 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed
in association with the toxicity tests, as well as all dose/response data. Total residual chlorine of the effluent
toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream.
•
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required,
the permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating
the facility name, permit number, pipe number, county, and the month/year of the report with the notation of
"No Flow" in the comment area of the form. The report shall be submitted to the Environmental Sciences
Branch at the address cited above.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will
begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement
will revert to quarterly in the months specified above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, then monthly
monitoring will begin immediately until such time that a single test is passed. Upon passing, this monthly test
requirement will revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of
Water Quality indicate potential impacts to the receiving stream, thus. permit may be re -opened and modified to
include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival, minimum control organism reproduction, and appropriate environmental controls, shall
constitute an invalid test and will require immediate follow-up testing to be completed no later than the last day
of the month following the month of the initial monitoring.

Permit No. NC0043532
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS CONTINUED
B.2. CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised November 1995, or subsequent
versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant
mortality is 2.6% (defined as treatment two in the procedure document). The permit holder shall perform
quarterly monitoring using this procedure to establish compliance with the permit condition. The tests will be
performed during the months of January, April, July and October. Effluent sampling for this testing
shall be performed at the NPDES permitted final effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TGP3B.
Additionally, DWQ Form AT-1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of Water Quality
4401 Reedy Creek Road
Raleigh, North Carolina 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed
in association with the toxicity tests, as well as all dose/response data. Total residual chlorine of the effluent
toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required,
the permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating
the facility name, permit number, pipe number, county, and the month/year of the report with the notation of
"No Flow" in the comment area of the form. The report shall be submitted to the Environmental Sciences
Branch at the address cited above.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will
begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement
will revert to quarterly in the months specified above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, then monthly
monitoring will begin immediately until such time that a single test is passed. Upon passing, this monthly test
requirement will revert to quarterly in the r_ : ,nths specified above.
Should any test data from this monitoring :luirement or tests performed by the North Carolina Division of
Water Quality indicate potential impacts to :: a receiving stream, this permit may be re -opened and modified to
include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival, minimum control organism reproduction, and appropriate environmental controls, shall
constitute an invalid test and will require immediate follow-up testing to be completed no later than the last day
of the month following the month of the initial monitoring.

Permit No. NC0043532
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS CONTINUED
B.3. CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised November 1995, or subsequent
versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant
mortality is 30% (defined as treatment two in the procedure document). The permit holder shall perform
quarterly monitoring using this procedure to establish compliance with the permit condition. The tests will be
performed during the months of f January, April, July and October. Effluent sampling for this testing
shall be performed at the NPDES permitted final effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TGP3B.
Additionally, DWQ Form AT-1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of Water Quality
4401 Reedy Creek Road
Raleigh, North Carolina 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed
in association with the toxicity tests, as well as all dose/response data. Total residual chlorine of the effluent
toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required,
the permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating
the facility name, permit number, pipe number, county, and the month/year of the report with the notation of
"No Flow" in the comment area of the form. The report shall be submitted to the Environmental Sciences
Branch at the address cited above.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will
begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement
will revert to quarterly in the months specified above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, then monthly
monitoring will begin immediately until such time that a single test is passed. Upon passing, this monthly test
requirement will revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of
Water Quality indicate potential impacts to the receiving stream, this permit may be re -opened and modified to
include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival, minimum control organism reproduction, and appropriate environmental controls, shall
constitute an invalid test and will require immediate follow-up testing to be completed no later than the last day
of the month following the month of the initial monitoring.

Permit No. NC0043532
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS CONTINUED
B.4. CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised November 1995, or subsequent
versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant
mortality is 4.6% (defined as treatment two in the procedure document). The permit holder shall perform
quarterly monitoring using this procedure to establish compliance with the permit condition. The tests will be
performed during the months of January, April, July and October. Effluent sampling for this testing
shall be performed at the NPDES permitted final effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TGP3B.
Additionally, DWQ Form AT-1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of Water Quality
4401 Reedy Creek Road
Raleigh, North Carolina 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed
in association with the toxicity tests, as well as all dose/response data. Total residual chlorine of the effluent
toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required,
the permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating
the facility name, permit number, pipe number, county, and the month/year of the report with the notation of
"No Flow" in the comment area of the form. The report shall be submitted to the Environmental Sciences
Branch at the address cited above.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will
begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement
will revert to quarterly in the months specified above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, then monthly
monitoring will begin immediately until such time that a single test is passed. Upon passing, this monthly test
requirement will revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of
Water Quality indicate potential impacts to the receiving stream, this permit may be re -opened and modified to
include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival, minimum control organism reproduction, and appropriate environmental controls, shall
constitute an invalid test and will require immediate follow-up testing to be completed no later than the last day
of the month following the month of the initial monitoring.

PERMIT NOTES mlc
NC0043532 Town of Oakboro WWTP Class III Yadkin -Pee Dee River Basin
Request for expansion from 0.5 to 0.9 MGD. 03-07-13
8/21/97 Received application, approved EA, and $200.
8/27 Wrote ack letter, requested SR.
10/22 Brian Cox, Engineering services called about construction question. Called RO to find
out status on SR. Samar B. says he sent it 2 weeks ago, he will send another copy.
10/27 Received SR. Samar recommends issuance.
Facility will construct to 1.2 MGD, but is requesting 0.9 now and then will request 1.2
in the future.
They do want to move to Rocky River with this expansion.
Will modify supp to cover and change IWC for tox test.
11/3 David Dickenson, Engineering Services, called. They need to construct a pump station
at the tail end of the plant to go to Rocky River. They could provide a basin to
overflow treated water in the event that the pump station goes out. They would like to
have 001 left in the permit as an emergency out -fall; they would only discharge treated
water, but water can gravity flow if the pump station goes out.
Auto dialer is present for notification of power or chlorine failure.
Can I leave limits in for 001 at the current flow? OK per WLA to leave in limits
at Long Creek.
CF Notes:
2/25/97 Compliance inspection Recommended enforcement action - Cyanide,
Chronic tox & mercury. Mercury limit in the permit (0.063 14/1) is below
detection level (0.2 µg/1). Added language to effluent limits page - The detection
limit for mercury is 0.2 pg/I. If the measured level of mercury is below the detection limit,
then the measurement is considered to be zero for the purpose of compliance evaluation
and should be reported on the DMR as < 0.2 pg/I.
Facility has a STMP and has passed pretreatment inspections.
Three tox fails in the last 4 years.
Permit WQ0005387 for sludge land application
Permit expires November 30, 1999.
Receiving Stream: Long Creek (001) Index #: 13-17-31
From source to Rocky River 9/1/74 Class C
Rocky River (002) Index #: 13-17
From source to Pee -Dee River 8/3/92 Class C
WLA Modelers did spec limits and RP at 0.9 MGD and including interaction with
Carolina Solite, NC0028169. Lead, cyanide and mercury are WQlimited.
LTMP to be dropped. Pretreatment Program list says it is modified. Called Mike
Blasburg. He says the facility has a modified LTMP program with quarterly sampling
for '98 only.

,
PERMIT NOTES mlc NC0043532 Town of Oakboro WWTP continued
Compliance data: 2 flow violations 12/97 and 1/98 (heavy rainfall). Chlorine is high
in the effluent; max = 1.99 mg/1, avg = .33 mg/1, calculated allowable = .37 mg/1
DMR's: Checked last 2 years of data for RP. Instream values are OK.
Drafting permit:
Modified the supp page to reflect ATC language for expansion.
Eff pages drafted for both flows at 001 discharge. This outfall will be used as a backup
only, if the pump station to 002 goes out. 001 outfall gravity discharges.
Removed limits for chromium, nickel, lead and arsenic per RP.
There will be a lockable valve box with manually turned weir plates at 001 discharge
pipe after relocation.
Modified effluent limits page for 002 per speculative limits given to the town 7/28/94.
BOD = 9/18, NH3 = 3/6, DO > 5, C12 = 28 µg/1 in order to achieve BODutt < 32
mg/1.
My calculations do not have limits on toxicants via reasonable potential, as did the
modelers.
Took out limits for chromium, nickel, lead, mercury, cyanide, and arsenic per
RP to Rocky River.
Took out limits for chromium, nickel, lead, and arsenic per RP at Long Creek.
Consultant says the water is primarily domestic and there is only 1 SIU - Stanly Knittin
Mills, textile, 0.35 MGD. (39% industrial; old WLA says 65% industrial)
3/16 To Mark McIntire for review.
Public Notice 3/25/98 Issue 5/11/98
5/1 To DAG for signature dated 5/11.
6/1 Back from DAG for changes.
6/10 To DAG for signature dated 6/15.
6/18 DAG would like to ensure that MRO is aware of all changes and wants to know about
interaction with Carolina Solite, NC0028169.
• 0.864 MGD was added to the RP analysis to account for 28169.
• Faxed copy of draft with all changes detailed to MRO.
7/13 Received concurrence and signed copy of fact sheet from MRO.
7/21 To DAG for issue 7/27.
7/27 Harry Dale, Engineering Services, called 662-7272. The facility would like to A.(4)
Summer NH3 changed from 3.0 mg/1 to 2.0 and the BOD changed from 9.0 mg/1 to
11.0. This was offered to them in a letter from Don Safrit to Mayor Hartsell 7/28/94.
This is OK with DAG and RO. Modified effluent page. Redated for 8/3/98.

DIVISION OF WATER QUALITY
July 9, 1998
Memo To: Mary Cabe
From: D. Rex Gleason
Prepared By: Samar Bou-Ghazale SPC
Subject: Town of Oakboro WWTP
Permit# NC0043532
Stanly County
The Mooresville Regional Office has no objections to the proposed permit limits and
monitoring as proposed by the Fact Sheet. Please find enclosed a signed copy of the fact sheet
by the MRO. Please note on page A(3) of the effluent limitations and monitoring requirements
(final) that the NCSR noted under Notes 1 should be NCSR 1917 and not 1659.
If you have any questions regarding this matter, please advise.

ION-18-1,99S 14:50 FROM DEM WATER QUALITY SECTION TO
iRRO
P.01/09
Division of Water Quality
Water Quality Section
.P.O. Box 29535
Raleigh, N.C. 27626-0535
• .FAX:[phone]
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FAX O:
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• Jt14-18-1,998 14:51 FROM DEM WATER QUALITY SECTION TO I1 O P.02/09
DENRIDWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0043532
•'—t,t i. •:•i: ., ,. •••• • ., t1 i •c•t: }rtiz•'= .{
.. y. •;i: ; r« •'' •:•;"I•i j I C i ( { 1 � '..Lit•
Facility Name:
tY
Town of Oak. , ro \ WTP
' Permitted Flow:
0.5 MUD)
Facility class: --�111
Facilityll'ermit Status: :
(i.e. New, Modification,
Existing or Renewal)
Moc ication - request to increase to 0.9 MUD
County:
Stanly -- -
- • r ?.• i r t r r.r.. t.•t.•� ... • • •.�'�.«'� i}••.�} "• i a. •-•:. :. .»�• � :� •.» �•u •�.• •.•..-.-...•��: .•• t : • . S�' •• t•.. n : ,• : . ,, ".:..: ••.:.. s• . : •., ... .:... r .
:Receiving
" Stern:
Long Creek, increase will include a relocation to Rocky River
Strcam (rlassiticatior,:
--- --�
C, - - - -- ------
Subbasin:
U3-07-1 —
Drair` age Area (mi2):
965 --- -
Summer 7(2 10 (cis)
29
Winter 7Q10 (cfs):
51
-313Q2 (cis):
76 .�
veragiFIow (cfs):
920 - - - - - - . - - -
twt.: (Vra):
z.ti .
v':•. -. • ••i•. .. •:r�...4• -- :,•44 ::Ktl:Jd. - r=ry.":40. .�'4. Z.S1W :•.. r »• �r .:r., ••.• - - .. •:;.:-t :a•"..r •.
Regional Uthee:
Mooresville
USGS Topo Quad:
U17NE
Changes Incorporated into Permit Renewal
': ..aripM. -+ .1 a1.. ��\i=;.tj. _•:/5}:
.74 10 k'•MtJ... tom::
;
RR ., ` -• •S;••r •,
..
.... .•'t. �.,t{::.t••
Relocation of outran
Miffs page
increase in now
Modification of supp page
A i C language for expansion
Increase in flow " -�"-
Reasonable -Potential- alysis
Removal of limits at Long
Creek (outfa11001)
Chromium, nickel, lead
and arsenic.
Removal of limas at Rocky
River (outran 002)
]mod, cyanide mercury
chromium, nickel, and arsenic
Keasonab1 Potential ilail3firs
Addition of limits at
expansion
13017, NH3,1DO and 1 RC
Speculative outs developed
7/28/94; potential toxicity.
Summary
This permit modification is for an expansion from 0.5 MGD to 0.9 MGD. The facility
has also been issued an Authorization to Construct (ATC) for relocation of the outfall from Long
Creek to the Rocky River. Limits pages were drafted for both flows at both discharge points.
Upon relocation, outfall 001 will be used as a backup only. If the pump station to 002
goes out, 001 outfall will gravity discharge. There will be a lockable valve box with manually
turned weir plates at 001 discharge pipe after relocation.
The effluent limits pages for 0.9 MGD were modified according to speculative limits
given to the town 7/28/94: BOD = 9/18 mg/l (summer/wintcr), NH3 = 3/6, Dissolved Oxygen >
5, and Total Residual chlorine 28 pg/1 in order to achieve a BODuitimatc demand on the
receiving waters of less than 32 mg/1_ (See attached letter from Don Safrit to Mayor Hartsell
dated July 28, 1994.)

)TW-18-1998 14:52 FROM DEM WATER QUALITY SECTION TO
I'RO P. 03/09
PERMIT NOTES ink
NC0043532 Town of Oakboro WWTP Class III Yadkin -Fee Dee River Basin
Request for expansion from 0.5 to 0.9 MGD. 03-07-13
8/21/97 Received application, approved EA, and $200.
8727 Wrote ack letter, requested SR.
10/22 Brian Cox, Engineering services called about construction question. Called RO to find
out status on SR. Samar B. says he sent it 2 weeks ago, he will send another copy.
10/27 Received Sit. Samar recommends issuance.
Facility will construct to 1.2 MGD, but is requesting 0.9 now and then will request 12
in the future.
• They do want to move to Rocky River with this expansion.
Will modify supp to cover and change IWC for tox test.
11/3 David Dickenson, Engineering Services, called. They need to construct apump station
at the tail end of the plant to go to Rocky River. They could provide a basin to
overflow treated water in the event that the pump station goes out. They would like to
have 001 Iefi in the permit as an emergency out -fall; they would only discharge treated
water, but water can gravity flow if the pump station goes out.
Auto dialer is present for notification of power or chlorine failure.
Cara leave limits in for 001 at the current flow? OK per WLA to leave in limits
at Long Creek.
CF Notes:
2/25/97 Compliance inspection Recommended enforcement action - Cyanide,
Chronic tox & mercury. Mercury limit in the permit (0.063 µg,/1) is below
detection level (0.2 µg/1). Added a to effluent limits - The d
limit for menu is 0.2 P� ete�an
mercuryttgll_ If the measured evel of mercury is below the detection limit,
then the measurement is considered to be zero for the purpose of compfance evaluation
end should be reported On the DMR as < 02 ;ugh.
Facility has a STMP and has passed pretreatment inspections.
Three tax fails in the last 4 years.
Permit WQ0005387 for sludge land application
Permit expires November 30,1999.
Receiving Stream,; Long Creek (001) Index #: 13-17-31
From source to Rocky River 9/I/74 Class C
Rocky River (002) Index #: 13-17
From source to Pee -Dee River 8/3/92 Class C
WLA Modelers did spec limits and RP at 0.9 MOD and including interaction with
Carolina Solite, NC0028169. Lead, cyanide and mercury are WQlimited.
LTMP to be dropped. Pretreatment Program list says it is modified. Called Mike
Blasburg.
He says the facility has a modified LTMP program with quarterly sampling
'98for
Y

41N-18-9,998 14:52 FROM DEM WATER QUALITY SECTION TO
PRO P. 04/09
PERMIT NOTES mlc NC0043532 Town of Oakboro WWTF continued
Compliance data: 2 flow violations 12/97 and 1/98 (heavy rainfall). Chlorin is high
in the effluent max = 1.99 mg/1, avg 33 mg/1, calculated allowable a= .37 uxg/1
DMIt's: Checked last 2 years of data for RP. Instream values are OK.
Drafting rmit:
M the supp page to reflect ATC language for expansion.
Effpages drafted for both flows at 001 discharge. This outfall will be used as a backup
only, if the pump station to 002 goes out. 001 outfall gravity discharges.
Removed Limits for chromium, nickel, lead and arsenic per RP.
There will be a lockable valve box with manually turned weir plates at 001 discharge
pipe after relocation.
Modified effluent limits page for 002 per speculative limits given to the town 7/28/94.
BOX) 9/18, N3/6, DO > 5, C12 = 28 µEli in orer to achieve BODOtt < 32
n NO3 rape!col, o.'titso .r 0-firMy calculations do not have limits on toxicants via reasonable potential, as did the
modelers.
Took out limits for chromium, nickel, lead, mercury, cyanide, and arsenic per
RP to Rocky River.
Took out Limits for chromium, nickel, lead, and arsenic per RP at Long Creek.
Consultant says the water is pimarily domestic and there is only 1 SRI - $tanly Ituittin
Was, textile, 0.35 MOD. (39% industrial; old WLA says 65% industrial)
3/16 To Mark McIntire for review.
Public Notice 3/25/98
5/1 To DAG for signature dated 5/11.
6/1 Back from DAG for changes.
6/10 To DAG for signature dated 6/15.
xnlc
Issue 5/11/98

A.(1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0043532
During the period beginning ON THE EFFECTIVE DATE OF THE PERMIT AND LASTING UNTIL RELOCATION TO THE ROCKY RIVER, EXPANSION OR
UNTIL EXPIRATION, the Perrnittee is authorized to discharge from outfaft serial number C 1
be used as an emergency backup outfalt, incase of pump station failure. Such discharges(Long Creek). After relocation to the Rocky River, this outfall may shall be I1mlted and monitored by the Permittee as specified below:
615
R t
•
110O, 5 day, 20°C2
otal Sus ended Residues
as Su:
-
NH3
(April 1 October 31)
NH3 as N (Noer l - taanch 31)
Dissolved Oxygen
iH4
ecai Comm (geometric mean)
"Total Residual Ghlonne
Total Nitrogen (NO2 + NO3 + TKN)
OS . 'rus
Temperature
Temperature "C
Conductivity
:tom" •.- �
30) mg/I
30.a mgil
4.0 mgtl
14.0 mg/i
20U 1100 mi
45.0 mgll
45.0 mgll
4100 1100 ml
r :s •
s` 4 s e
� .tt•'zeis•::z'.•..� :..si5 ,z z _ �•••-tz:'.t•Yi!tisrs •s.•:.i
I�FI::z-
t.. 'yR,f7s.7i • $ tea,..:
on nova
3lweek
7reek
Wweek
3nxeeic
3/week
3lweek
air
Composite
Composite
�I or
E, 1
E, I
Composite E
Composite
Grab E, U, D+
Grab
3lweeK Grab
Chronic Toxicity0
Arsenic
Chromium
Nickel
Lead
3fweeR
Quarterly
Quarterly
Daily
Week
*Week
Grab)
E, U, D+
Composite
Compete
Grab
Grab
Grab
Quarterly
Month
2/Month
composite
composite
2/Month
Cyanide
opper
2IN[onth
28 Ngil
Wee
2?Mo
5dver
Mercury's
2 The monthly average effluent BODe and TSS concentrations shall not exceed 15% of the res
3 The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg11. peCt�le Influent value �85°% removal).
4 The pH shaft not be less than 8.0 standard units nor greater than 9.0 standard unitscl
e Chronic Toxicity (Ceriodaphnia) PIF at 19%; January, April, July, and October, See Special Condllions page, 8.1.
The detection Iimit for mercury Is 0.2 NgiL lithe measured level of mercury is below the detection limit, then the measurenent is considered to be zero for -0
the purpose of compliance evaluation and should be reported on the DIM as < 0.2 pgfi.
There shall be no discharge of floating solids or visible foam In other than trace amounts.
0
2/Month
11063 pgfi Weekly
2/Month
Composite
Composite
Composite
Grab
U, D}
U, D}
Composite
Compete
composite
Composite
86 t-8Z-Nhr
NO I103S A.I-1tiO0
O
oes:
sample locations: E - Effluent, I - Infhrent, U - Upstream at least 100 feet above the discharge point, D - Downstream below the discharge point at NCSR
1917.
• Instream samples shad be grab samples and shall be collected 3Aveekk during the months of June through September and once
remaining months of the year. g per week during the

A.(2) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0043532
During the period beginning UPON RELOCATION TO THE ROCKY RIVER AND LASTING UNTIL EXPANSION OR EXPIRATION, the Permlttee is authorized to
discharge from outfall serial number 002 (Rocky River), Such discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT CHARACTERISTICS
,�
LIMITS
MONITORING REQUIREMENTS
Monthly 1 Weekly
Average J Average
Daily
Maximum
Measurement
Frequency
Fre9 Y
Sample
. Type
Sample
Location",
Flow
0.5 MGD
Continuous
Recording
I or E
BOO, 5 day. 20°C2
30.0 mall
45.0 mg/i
3/week
Composite
E, 1
Total Suspended Residues
30.0 mail
45.0 MO
3/week
Composite '
E, 1
NH3 as N (April 1 - October 31)
30.0 mgll
3/week
Composite '
E
NI-13 as N (November 1- March 31)
3Aveek
Composite
E
Dissolved Oxygen
3lweek
tab
E. lf, D*
pH'
3/week
Gnu
E
Fecal Cotiform (geometric mean)
200 / 100 ml
400 / 100 ml
i
3/week
Grab
E, U, D+
Total Residual Chlorine
3/week
Grab
E
Total Nitrogen NN02+ Noe+TM)
Quarterly
Composite
E
Total Phosphorus
Quarterly
Composite
E
Temperature °C
Daily
2 O C � .�t3G� Eoouou
E
Temperature °C
-
3/week
Lit a+
Conductivity
3lweek
U, D+
Chronic Toxicity's
Quarterly
E
Arsenic
2/Month
E
Chromium
2/Month
E
Nickel
2/Month
E
Lead
2/Month
E
Cyanide
2/Month
Grab
E
Copper _
•Zinc
'
2/Month
Compose
E
2/Month
Composite
E
ISilver
2111ilonthCornposke
1
E
Mercury
2/Month
Composite
E
Notes:
I Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above the discharge point, D • Downstream 1.7 miles below the discharge point (at
the end of or close to NCSR 1659).-
+ Instream samples shall be grab samples and shall be collected 3fweek during the months of June through September and once per week during the
remaining months of the year.
2 The monthly average effluent 8003 and TSS 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 6.0 mgtl.
4 The pH shads not be less than 8.0 standard units nor greater than 9.0 standard unIIs.
ChraricToxicity (Ceriodaphnla) P/F at 2.6%; January, AO. July, and October; See Special Conditions page, 8.2.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
8661-8T—half
NOI103S Aintina 831IM W3Q

1
A.(3) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL
During the period beginning UPON EXPANSION AND LASTING UNTIL RELOCATION TO THE
to discharge from outfall serial number 001 (Long Creek). Such discharges shall be limited and
1EFFLl sl:lf U.Crietr ACT RIS1 r.
I -low
BOD, 5 day, 20°C2 (April 1 - October 31)
BOD, 5 day, 20°C2 (November 1 - March 31)
Total Suspended Residue2
NH3 as N (April 1 - October 31)
NH3 as N (November 1 - r„1arc
D'ssoJved Oxygen'
-0.TNI"t;D
9.0 nigh
1 B_0 mg/I
13.5 mgll
2 /.0 mg/l
30_0 mg/1 45.0 mg/l
2.13 mg/I
.0 mg/I
Permit No_ NC0043532
ROCKY RIVER OR EXPIRATION, the Permittee is authorized
monitored by the Permittee as specified below:
ONITORING:ftECU1REMENT ;:::_
in :-amp_.
: g11;a i : ;: `Tye,
Coi nuous r{eeording
Composite
3/week
3.week
3tweek
3/week
3/week
pH4
I-ecal Coliform (geometric mean)
otal Residual Chlorine
I eta! Nitrogen (NO2+ NO3+ 1 ItN)
I otal Phosphorus
Temperature " C
Temperature C
Conductivity
Chronic Toxicity
Arsenic
Chromium
Nickel
Lead
2 U 100 rn1 40U f 100 mt
20 pglf
3tweek
31week
3/week
3/week
Q uarte rty
0 uarterty
Daily
31week
3/week
Composite
Composite
Composite
Composite
Grab
Grab
Grab
Grab
Composite
Composite
rab
Grab
ample
cationt:.'.
I or E
E, I
E.,I
E,
Quarterly
2/Month
2/Month
Cyanide
-Copper
Line
Sitver
17 [roil
Mercuryo
4 s The pH shall net be less than 6.0 standard units nor greater than 9.0 standard units.
Chronic Toxicity (Ceriodaphr,ia) PJF at 30%; January, April, July, and October; See Special Conditions page, B.3.
6
There shall be no discharge of floathg solids or visible foam in other than trace anxunts.
The detection limit for mercury is 0.2 l.rgfl. If the measured level of mercury is below the detection limit, then the measurement is considered to be zero for
the purpose of compliance evaluation and should be reported on the DIMR as < 0.2 pgfl.
0,040 1Jgt1
2/Month
2/Month
Weekly
2/Month
2/Month
2/Month
Weekly
Crab
Composite
Composite
Composite
Composite
Composite
Grab
Composite
Composite
Composite
Composite
E
E
E, U. D+
E
E, U, D+
E
E
E
U, D+
U, D+
E
E
E
E
E
E
i
Notes:
1—Sample locations: E - Effluent, I influent, U - Upstream at least 100 feet above the discharge point; D - Downstream 1.7 miles below the discharge point
(at the end of or close to NCSR 1659).
+ Instream samples shall be grabples and shall be collected 3/week during the months of June through September and once per week during the
remaining months of the year.
2 3 The monthly average effluent BODS and TSS concentrations shall not exceed 15% of the respective influent value (86% removal).
The daily average dissolved oxygen effluent concentration shall not be less than 5.0 rng/I.
1
866 b-8T-NfII
NOIDES)LI1lnOa

'EFFLUENT CHAR�Cg I LIMITS
A.(4) EFFLUENTLIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0043532
During the period beginning UPON EXPANSION AND RELOCATION TO THE ROCKY RIVER AND LASTING UNTIL EXPIRATION, the Perrnittee is authorized
to discharge from outfall serial number 002 (Rockyfliver), Such discharges shall be limited and monitored by the Pernmittee as specified below:
Flow
BOD, 5 day. 20°C2 (April 1 - October 31)
BOD, 5 day, 20°C2 (November 1- March 31)
Total Suspended Residue2
N as N (April 1- October 31)
NHsas N (November 1- March 31)
Dissolved Oxygen3
pHa
Fecal Conform (uric mean)
Total Residual Chlorine
Total Nitrogen (NOG + NO3 + TKN)
Total Phosphorus
Temperature QC
Temperature °C
Conductivity
Chronic 7oxicity5
Arsenio
Chromium
Nickel
Lead
Cyanide
Copper
Silver
Mercury
s daily average dissolver) oxygen effluent concentration shall not be less than 5.A mgli.
' The pH shall not be less than 6.0 standard units nor greater than 9.0
B Chronic Toxicity (Ceriodaphnla) PIF at 4.6%; Januay April, -July, and October; See Special Conditions page, B.4.
9
There shall be no dscharge of floating solids or vlslbb foam in other than trace ants.
J
i
Monthly Weekly
Monthly Weekly
Avera ► e Aver = e
0.9MGD
9.0 moll 13.5 rnft11
18.0 mgll 27.0 mg I
30.0 moll 45.0 mg/I
3.0 mg/1
6.0 mgll
200/ 100 m1
l
400 f 100 nal
Daily
Maximum
28 µOil
MONITORING REQUIREMENTS
Measurement
Fro , uenc
_1
Continuous Recording 1 orE
3/week Compose E.I
3lweek Composite E I
3/week Composite E.1
3/week Composite E
3/week Composite E
3/week Grab E, U. Q+
3Aveek Grab E
3/week Grab E U, p+
3/week Grab E
Quarterly Composite _ E
Quarterly Composite E
Daily Grab E
3/week Grab U, D+
3fweek Grab UUDD
E
Quarterly Composite
2/Month
2/Month
2/Month
2/Month
2/Month
21Month
2/Month
Month
2/Month
Notes:
I Sample locations: E - Effluent, I - influent, U -
the end of or close to NCSR 1659). upstream at least 100 feet above the discharge point, D - Downstream 1.7 miles below the discharge point (at
+ lnstream sampres shall be grab saniples and shall be collected 31week duringthe months of June through Se ternber and once
remaining months of the year. g p per week during the
7 The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respecter influent value (85% removal).
The
sample I Sample
Type I Location'
Composite
Composite E
Composite E
Composite E
E
E
E
E
Composite I E
Grab
Composite
Composite
, Composite
E
1
WO&I LS:PT 866t-8T-WI
NO I1O3S A1I7dflO 831UM W3a
60/80'd OdJ

JUN-18-1998 14:58 FROM DEM WATER QUALITY SECTION TO MRO P.09/09
DENR!DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0043532
Summary Continued
Performed a reasonable potential analysis. The last reasonable potential analysis was
performed by the modeling unit January 1993. The wastewater is primarily domestic and there
is 1 Significant Industrial User - Stanly itnittin Mills, a textile plant with 0.35 MOD. This
accounts for 39% of the WWTPs flow as industrial; the old WLA states 65% was industrial.
Outfall 001 0.5 and 0.9 MGD: Limits for chromium, nickel, lead and arsenic were removed.
If Outfa002 0.5 and 0.9 MGD: Limits for chromium, nickel, lead, mercury, cyanide, and
arsenic were removed.
Proposed Schedule for Permit Issuance
Draft Permit to Public Notice: 3/25/98
Permit Scheduled to Issue: 5/11/98
State Contact
If you have any questions on any of the above information or on the attached permit, please
contact Mary Cabe at [phone], extension 518.
Copies of the following are attached to provide further information on the permit development:
• Reasonable Potential Analysis (majors only)
• Existing permit effluent sheets with changes noted (existing facilities only)
• Draft Permit
NPDES Recommendation by;
Regional Office Comments
Regional Recommendation by: Qrs, / Date: 7- 7- 7�
Reviewed By:
Regional Supervisor: /-' J� ZerEJ , / Date: 2/74
r � i
NPDES Unit: Date:
TOTAL P.09

North Carolina } ss
Mecklenburg County
The Knight Publishing Co., Inc.
Charlotte, NC
Affidavit of Publication
THE CHARLOTTE OBSERVER
WATER QUALITY BUDGET OFC
PO BOX 27687
RALEIGH NC 27611-7687
REFERENCE: 20076845 OAKBORO WW
2613017 ISSUE STATE NPDES PE
Before the undersigned, a Notary Public of said
County and State, duly authorized to administer
oaths affirmations, etc., personally appeared,
being duly sworn or affirmed according to law,
doth depose and say that he/she is a
representative of the Knight Publishing Company a
corporation organized and doing business under the
laws of the State of Delaware, and publishing a
newspaper known as The Charlotte Observer in the
city of Charlotte, County of Mecklenburg and State
of North Carolina and that as such he/she is
familiar with the books, records, files and
business of said Corporation and by reference to
the files of said publication
the attached advertisement was inserted. The
following is correctly copied from the books and
files of the aforesaid Corporation and
Publication.
PUBLISHED ON: 03/22
AD SPACE:
FILED ON:
NAME:
80 LINE
03/26/,
In Testimony Whereof I
day and ye aforesai
t
Notary: �\
have
CAtd/da1TLE :
DATE:
hereunto set my hand an
C./1.k
PUBUC NOTICE
STATE OF NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
POST OFFICE BOX 29535
RALEIGH, NORTH CAROLINA 27626-0535
NOTIFICATION OF INTENT TO ISSUE A STATE NPDES PERMIT
On the basis of thorough staff review and application of Article 21 0l Chapter
143. General Statutes of North Carolina, Public Law 92.500 and other lawful
standards and regulations, the North Carolina Environmental Management
Commission proposed t0 issue a permit t0 discharge to the persons listed
below effective 5/11)98 and subject t0 special conditions.
Persons wishing to comment upon or object to the proposed determinations
are Invited to submit same In writing to the above address no later than
4/231.98. All comments received prior t0 that dale will be considered in the
formulation of final determination regarding the proposed permit. A public meeting
may be held where the Director at the Division of Environmental Management
finds a significant degree of public interest In a proposed permit.
A copy of the draft permit is available by writing or calling the Division of Envi-
ronmental Management, P.O. Box 29535, Raleigh, Nbrth Carolina 27626.0535,
[phone].
The application and Other information may be inspected at these location during
normal office hours. Copies o1 the information on file are available upon request and
payment of the costs of reproduction All such comments or requests regarding a
proposed permit should make reference to the NPDES permit number listed below.
Date 3/18/98 A. Preston Howard Jr.. P.E, Director
Division of Environmental Management
Public notice of intent to issue a State NPDES permit to the following: •
1. NPDES No. NC0041932. The Town of Oakboro, Post Office Box 610,
Oakboro, NC 28129 has applied for a permit modification for a facility
located at the Oakboro Wastewater Treatment Plant, Off Of NCSR 1953, east
of Oakboro, Scanty County. The facility discharges 0.50 MGD o1 treated domes-
tic and industrial wastewater from one outfall into Long Creek. a Class C
stream in the Yadkin -Pee Dee River Basin which has a 7010 flow of 3.3 cfs.
The facility proposes to increase the discharge to 0.90 MGD and to relocate
the outfall to the Rocky River, a Class C stream In the Yadkin -Pee Dee River
Basin which has a 7010 flow of 29 cis. Cyanide and mercury are water quality
limited. For some parameters, the available load capacity of the immediate re-
ceiving water will be consumed. This may affect future water quality based el -
fluent limitations for additional discharges within this portion of the water.
shed. LP2613017
f ixed seal, the
My Commission Expires 01/04/2003
My Commission Expires: __/__/__

Account # : 121990-00000
Customer
..7
i14ti111, I Is: r
II:: ;., I:::U it::::r ¢.::i , 4.:. Al. I:.:1
n..in ,::::t a .N.. rra ,N IV) el i„:'
(` a ' 10, ,II"g. ; a r x:::iC „ :" ........ ;r:'' ::ill.
AFFIDAVIT OF INSERTION
Name: MS F COTTEN ENVIRONMENTAL MANAGEMENT
WATER QUALITY BUDGET OF(:
P 0 BOX 29535
RALEIGH NC 27626-0535
Classification: Public Notice
Start: 03 /26 /98 Times: 1
Editions: F C
(C=MON I F-THUR I O=SHOPPER)
TOTAL CHARGES: $ 84.00
NORTH CAROLINA, STANLY COUNTY
AFFIDAVIT OF PUBLICATION
Before the undersigned, a Notary
Public of said County and State, duly
commissioned, qualified, and authorized
by law to administer oaths, personally
appeared: LaJeune Waggoner, who being first
duly sworn, deposes and says: that he Is
Publisher of a newspaper known as STANLY
NEWS AND PRESS, published, issued, and
entered as second class mail in the City
of Albemarle, in said County and State;
that he is authorized to make this
affidavit and sworn statement; that the
notice or other legal advertisement, a
true copy of which is attached hereto,
was published in the STANLY NEWS AND
PRESS on the dates specified on the copy
attached and that the said newspaper'in
which such notice, paper, document, or
legal advertisement was published was, at
the time of each and every such
publication, a newspaper meeting all of
the requirements and qualifications of
Section 1-597 of the General Statutes of
North Carolina and was a qualified
newspaper within the meaning of Section
1-597 of the General Statutes of Norit
Carolina.
Sword to and subscribed before me,
lEotch
day of
Date: 03/18/98
• PUBLIC NOTICE
STATE OF NORTH CAROUNA
ENVIRONMENTAL MANAGEMENT COMMISSION
POST OFFICE BOX 29535
RALEIGH, NORTH CAROLINA 27626-0535
NOTIFICATION OF INTENT TO ISSUE A STATE.
0 U ' NPDES PERMIT
40n the basis of thorough staff review and application Of
Article 21 of: Chapter' 143, General Statutes of North
Caraina,"Pubk Law•92.500 and other lawful standards
and 'regulations, 'the North Carolina Environmental
Management Commission proposes to Issue a permit to
4, discharge to the.persons listed below eftecfive 5/11r98
'P andistbject to special conditions,"
Persons wishing to commend upon;or object to the
proposed determinations are invited.to submit sante In
' writing to the above address no later than 423'98. All
comments received prior to that date will be considered
fi theionrwlatbn of final determinations regarding the
proposed permit A public meeting may be held where
the. Director of the Division of Environmental Manage-
ment finds a slgrcant,degree of public interest in a
y ppq��d Pefart� ,;
A copy of the draft permit Is available by writing orcalrimg
the Division of Environmental Management, P.O. Box
29535, Raleigh, North Carolina 27626-0535, (919) 733-
7015.
The application and other information may be inspected
i• at these locations during normal office hours. Copies of
the'Information on file are available triton request and
.payment of the costs of reproduction. All such comments
or requests regarding a proposed permit should make
reference to the NPDES permit number listed below.
ated: 3/18/98 David A. Goodrich
t�°i�; for A. Preston Howard Jr., P.E., Director
Division of Environmental Management
•
• Public notice of Intent to issue a State NPDES permit to
• Ihe,tollowing:
1, NPDES NO.NC0043532. The Town of Oakboro, Post
Office Box 610, Oakboro, NC 28129 has applied for a
permit modification for a facility located at the Oakboro
Wastewater Treatment Plant, off of NCSR 1953, east of
Cakbero, Stanly County, .Thd facility discharges 0.50
MGD of treated domestic and Industrial wastewater from
one outlall into Long Creek, a Class C stream In the
I Yadkin•Pee Dee River Basin which has a 7010 flow Of
3.3 cis. The facility proposes to increase the discharge
to 0.90 MGD and to relocate the oulfall to the Rocky
I River, a Class C stream In the Yadkin -Pee Dee Rivera,.
Basin which has a 7010 flow of 29 cIs. Cyanide and
mercury are water quality limited. For some parameters, •
the. available. bad capacity 01 the Immediate receiving
water will be consumed. This may alfect future water
, quality based effluent limitations for additional dischar•'
ges within this portion of the watershed. '
.,March 26, 1998
this )(p
sa—CL
Notary Public
My Commission expires
19612

tXtS
v. 5 MG.) -fur
TOXICANT ANALYSIS
J (%
ci NC.()L. I
6/9/
Facility Name
Town of Oakboro
Parameter =
Cadmium
Parameter =
Chromium
Pa
NPDES #
NC0043532
Standard =
2
pg/I
Standard =
50
pg/I
S
Qw (MGD)
1.364
7Q1Os (cfs)
3.3
n
BDL=1/2DL
tual Data
RESULTS
Std Dev.
n
DL=1/2D
ual Data
RESULTS
IWC (%)
19.00
1
0.5
<1
0.2780031
1
1
<2
Std Dev.
1.71
Stream
Rocky River
2
0.5
<1
Mean
0.5857143
2
2
2
Mean
1.46
Stream Class
C
3
0.5
<1
C.V.
0.4746394
3
1
<2
C.V.
1.17
4
0.5
<1
<1
4
1
<2
FINAL RESULTS
5
0.5
5
1
<2
Cadmium
OK I
6
0.5
<1
Mull Facto
40)
1.6
3.2
10.5
6
1
<2
MultFactor =
Max. Pred Cw
3.2
7
0.5
_ <1
<1
<1
Max. Valu=
Max. Pred
Allowable
pg/
7
1
<2
Max. Value
pg/I
Allowable Cw
_
10.5
8
0.5
pg/
Ng/
8
1
1
<2
Max. Pred Cw
pg/I
pg./1
9
0.5
9
<2
Allowable Cw
.
Chromium
OK I
10
0.5
<1
10
1
<2
Max. Pred Cw
_ 22
11
0.5
<1
11
1
<2
Allowable Cw
263.2
12
0.5
<1
12
1
<2
13
0.5
<1
13
1
<2
Nickel
OK I
14
0.5
<1
14
1
<2
Max. Pred Cw
13.5
15
1.6
1.6
15
1
<2
Allowable Cw
131.6
16
1.2
1.2
16
1
<2
17
0.5
0.5
<1
<1
17
1
<2
Cyanide
LIMIT
18
18
1
<2
Max. Pred Cw
59.80
19
0.5
<1
19
1
<2
Allowable Cw
26.3
20
0.5
<1
20
1
<2
21
0.5
<1
21
1
<2
Copper
MONITOR
22
22
1
<2
Max. Pred Cw
240
23
23
1
<2
Allowable Cw
36.8
24
_
24
1
<2
25
25
1
<2
Zinc
MONITOR
26
26
1
<2
Max. Pred Cw
_ Allowable Cw
1075
27
27
1
<2
263.2
28
28
1
<2
29
29
11
11
Lead
OK I
30
30
1
<2
Max. Pred Cw
5.4
31
- ---- -
---
31
32
33
1
1
<2
Allowable Cw
131.6
32
<2
33
---
1
<2
Arsenic
OK 1
34
34
1
<2
Max. Pred Cw
14.7
35
35
1
<2
Allowable Cw
263.2
36
36
1
<2
37
37
1
<2
Silver
MONITOR
38
38
1
<2
Max. Pred Cw
69.7
39
39
2.5
<5
Allowable Cw
0.3
40
40
6
6
41
41
1
<2
Mercury
LIMIT
42
42
4
8
Max. Pred Cw
0.11
43
43
1
<2
Allowable Cw
no
0.063
44
44
45
1
<2
45
1
<2

TOXICANT ANALYSIS
ameter =
Nickel
Parameter =
Cyanide
Parameter =
Copper
andard =
25
pg/I
Standard =
5
Ng/I
Standard =
7
pg/I
n
DL=1/2D.ctual
Dat
RESULTS
n
DL=1/2DLctual
DataRESULTS
n
DL=1/2D.ctual
Dat
RESULTS
1
8
8
Std Dev.
1.7353
1
16
16
Std Dev.
6.036
1
37
37
Std Dev.
26.907
2
7
7
Mean
6.4773
2
7
7
Mean
9.857
2
20
20
Mean
35.452
3
5
5
C.V.
0.2679
3
15
15
3
26
C.V.
0.612
3
18
18
C.V.
0.759
4
7
7
4
3
4
12
12
26
5
30
30
6
8
8
Mult Factor =
1.5
6
16
16
Mult Factor =
2.3
6
48
48
Mult Factor =
2.0
7
7
7
Max. Value
9
pg/I
7
11
11
Max. Value
26
pg/l
7
19
19
Max. Value
120
pg/
8
8
8
Max. Pred Cw
13.5
131.6
pg/I
pg/I
8
9
10
3
10
3
Max. Pred Cw
Allowable Cw
59.8
26.3
pg/I
pg/I
8
46
46
16
Max. Pred Cw
Allowable Cw
240
36.8
pg/
Ng/
9
7
7
Allowable Cw
9
16
10
6
6
10
4
4
10
14
14
11
7
7
11
9
9
11
19
19
12
6
6
12
5
5
12
55
55
13
7
7
13
10
9
10
13
36
36
14
5
5
14
9
14
23
23
15
4
4
15
8
8
15
33
33
16
6
6
16
17
3
3
16
31
31
17
2.5
<5
19
19
17
43
43
18
7
7
18
13
13
18
120
120
19
9
9
19
11
11
19
19
19
20
9
9
20
4
4
20
28
28
21
8
8
21
5
5
21
17
17
22
3
3
22
22
20
20
23
23
23
46
46
24
24
24
12
12
25
25
25
15
15
26
26
26
14
14
27
27
28
27
25
58
2528'
58
28
29
29
29
90
90
30
30
30
30
30
31
31
... 32
- --
----
--
31
22
22
— 32
33
— -
32
66
66
33
33
19
19
34
34
34
96
96
35
35
35
42
42
36
36
36
59
59
37
37
37
110
110
38
38
38
15
15
39
39
39
17
17
40
40
40
- 19
19
41
41
41
16
16
42
42
42
14
14
43
43
43
44
44
44
45
45
45

TOXICANT ANALYSIS
Parameter
Zinc
Parameter =
Lead
Parameter =
Arsenic
Standard =
50
pg/I
Standard =
25
pg/I
Standard =
50
pg/I
n
DL=1/2D_ctual
Data
RESULTS
n
DL=1/2D_ctual
Data
RESULTS
n
DL=1/2DL
ctual Dat•
RESULTS
1
79
79
Std Dev.
68.081
1
1
<2
Std Dev.
0.478
1
1
<2
Std Dev.
1.22
2
55
55
Mean
76.029
2
1
<2
Mean
1.143
2
1
<2
Mean
1.64
3
34
34
C.V.
0.8955
3
1
<2
C.V.
0.418
3
1
<2
C.V.
0.75
4
41
41
4
1
1
<2
<2
4
1
<2
5
60
60
5
5
1
<2
6
73
73
Mult Factor =
2.5
6
1
<2
Mult Factor =
1.8
6
1
<2
Mult Factor =
2.1
7
24
24
Max. Value
430
Ng/I 7
1
<2
Max. Value
3
pg/I 7
1
<2
Max. Value
7
pg/
9
83
83
43
Max. Pred Cw
Allowable Cw
1075
263.2
pg/I 8
pg/I 9
1
1
<2
Max. Pred Cw
Allowable Cw
5.4
131.6
pg/I 8
1
<2
Max. Pred Cw
14.7
263
pg/
pg/
43
<2
pg/I 9
1
<2
Allowable Cw
10
430
430
<- 5/97
10
1
<2
10
1
<2
11
47
47
11
1
<2
11
1
<2
12
30
30
12
1
<2
12
1
<2
13
52
52
13
1
<2
13
1
<2
14
60
60
14
1
<2
14
1
<2
15
55
55
15
3
3
15
1
<2
16
96
96
16
1
<2
16
1
<2
17
50
50
17
2
1
1
2
<2
<2
17
1
<2
18
19
60
73
60
73
-- —
18
19
18
1
<2
19
2
2
20
57
57
20
1
<2
20
1
<2
21
58
58
21
1
<2
21
2
2
22
88
88
22
22
2
2
23
45
45
23
23
3
3
24
63
63
24
24
3
3
25
22
22
25
25
7
7
26
31
31
26
26
1
<2
27
92
92
27
---
- -- --
27
1
<2
28
29
110
71
--- 110
71
28
29
28
-- . -- -- 29
1
---- ---- 3
<2
-------- 3
30
140
140
30
30
1
<2
31
74
74
31
32
31
2
2
32
120
120
32
1
<2
33
83
83
33
33
4
4
34
86
86
34
34
2
2
35
35
35
3
3
36
36
36
2
2
37
37
37
38
38
38
39
39
39
40
40
40
411
41
41
42
42
42
43
43
43
44
44
44
45
45
45

TOXICANT ANALYSIS
6/9/98
arameter =
Silver
Parameter =
Mercury
Standard =
0.06
pg/I
Standard =
0.012
pg/I
n
DL=1/2D
ctual Data
RESULTS
n
DL=1/2D
tual Data
RESULTS
1
1
<2
Std Dev.
3.2312
1
0.1
<0.2
Std Dev.
0
2
2
2
Mean
1.8286
2
0.1
<0.2
Mean
0.1
3
1
<2
C.V.
1.767
3
0.1
<0.2
C.V.
0
4
1
<2
4
0.1
<0.2
5
1
<2
5
0.1
<0.2
6
1
<21
Mult Factor =
4.1
6
0.1
<0.2
Mult Factor =
1.1
7
1
<2
Max. Value
17
pg/I 7
0.1
<0.2
Max. Value
0.1
Ng/
1
<2
Max. Pred Cw
Allowable Cw
69.7
0.3
pg/I 8
0.1
<0.2
Max. Pred Cw
0.11
pg/
1
<2
pg/I 9
0.1
<0.2
Allowable Cw
0.1
pg/
10
1
<2
10
0.1
<0.2
11
1
<2
11
0.1
<0.2
12
11
17
'
13
<2
13
0.1
<0.2
14
1
<2
14
0.1
<0.2
15
12
12
15
0.1
<0.2
16
1
<2
1
16
0.1
<0.2
1
_
17
1
<2
17
0.1
<0.2
18
1
<2
1
18
0.1
<0.2
19
1
<2
19
0.1
<0.2
20
1
<2
1
20
0.1
<0.2
21
1
<21
21
0.1
<0.2
1
_
22
1
<2
1
22
0.1
<0.2
23
1
<2
23
0.1
<0.2
24
1
<2
24
0.1
<0.2
25
1
<2
25
0.1
<0.2
26
1
<2
26
0.1
<0.2
1
_
27
1
<2
27
0.1
<0.2
28
29
1
1
<2
<2
I
28
29
0.1
0.1
<0.2
<0.2
30
1
<2
30
0.1
<0.2
31
1
<2
31
-----32
0.1
0.1
<0.2
32
1
<2
<0.2
33
1
<2
--_-- ----..
�
- - 33
0.1
<0.2
34
1
<2
34
0.1
<0.2
35
2
2
35
0.1
<0.2
36
-
36
0.1
<0.2
37
37
38
38
39
39
40
40
41
41
42
42
43
43
44
44
45
45

I�o,10 (.c,.
I)(\
)fl 5.1Gn r).t Z-1
TOXICANT ANALYSIS
679
acility Name
Town of Oakboro
Parameter=
Cadmium
Parameter=
Chromium
Parameter=
Nickel
NPDES #
NC0043532
Standard =
2
pg/I
I Don't forget to check withStandard =
50
pg/I
Standard =
25
Qw (MGD)
1.364
7Q10s (cfs)
29
n
BDL=1/2DL
tual Data
J RESULTS
n
DL=1/2D
ual Data
RESULTS
n
DL=1/2D
IWC (%)
2.60
1
0.5
<1
Std Dev.
0.2780031
1
1
<2
Std Dev.
1.43
1
8
c'ving Stream
Rocky River
2
0.5
<1
Mean
0.5857143
2
2
2
Mean
1.35
2
7
Stream Class
C
3
0.5
<1
C.V.
0.4746394
3
1
<2
C.V.
1.
3
5
4
0.5
<1
4
1
<2
4
7
FINAL RESULTS
5
0.5
<1
5
1
<2
5
6
Cadmium
ax. Pred Cw
OK 1
3.2
6
7
0.5
0.5
<1
<1
Mutt Facto
` l(o
1.6
6
1
<2
Mult Factor =
2.0
6
8
Max. Valu=
pg/
7
1
<2
Max. Value
11
ig/I 7
7
Allowable Cw
76.9
8
0.5
<1
Max. Pred
Allowable
yp/
8
1
<2
Max. Pred Cw
22
pg/I 8
8
9
0.5
<1
_BIZ
76.9
pg/
9
1
<2
Allowable Cw
1923
pg/I 9
7
Chromium
OK !
10
0.5
<1
10
1
<2
10
6
ax. Pred Cw
22
11
0.5
<1
11
1
<2
11
7
Allowable Cw
1923.1
12
0.5
<1
Linear Interpolation of Mult
12
1
<2
Linear Interpol. of MF
12
6
13
0.5
<1
13
1
<2
13
7
Nickel
OK I
14
0.5
<1
C.V.
0.4746394
14
1
<2
C.V.
1.06
14
5
ax. Pred Cw
13.5
15
1.6
1.6
C.V. l0
0.4
15
1
<2
C.V. l0
1
15
4
Allowable Cw
961.5
16
1.2
1.2
C. V. hi
0.5
16
1
<2
C. V. hi
1.1
16
6
17
0.5
<1
<1
M
MFhi
MFIo
1.8
17
1
<2
MFhi
1.3
17
2.5
Cyanide
OK I
18
0.5
1.6
_
18
1
<2
MFIo
1.3
18
7
ax. Pred Cw
60.12
19
0.5
<1
MF=
1.7
19
1
<2
MF=
1.3
19
9
Allowable Cw
192.3
20
0.5
<1
20
1
<2
20
9
21
0.5
<1
21
1
<2
21
8
Copper
OK !
22
-
--,
22
1
<2
22
3
ax. Pred Cw
240
23
23
1
<2
23
Allowable Cw
269.2
24
--1-
.
24
1
<2
24
'
•
Zinc
OK 1
26
26
1
<2
26
ax. Pred Cw
1075
27
27
1
<2
27
28
29
Allowable Cw
1923.1
28
28
1
<2
29
29
11
11
Lead
OK I
30
30
1
<2
30
ax. Pred Cw
5.1
31
31
1
<2
31
Allowable Cw
961.5
32
32
1
<2
32
33
33
1
<2
33
Arsenic
OK 1
34
34
1
<2
1
34
ax. Pred Cw
14.7
35
35
1
<2
35
Allowable Cw
1923.1
36
-
36
1
<2
36
37
37
1
<2
M
37
Silver
MONITOR
38
38
1
<2
38
ax. Pred Cw
69.7
39
39
2.5
<5
39
Allowable Cw
2.3
40
40
6
6
40
41
41
1
<2
41
Mercury
OK 1
42
42
4
8
42
ax. Pred Cw
0.11
•
43
-1
43
1
<2
43
Allowable Cw
0.462
44
44
1
<2
44
45
45
1
<2
45

-4; 4 ti+'Zn Fl , (-0 / S
MGO �iJr Q��c 6a co* O•�`f''/I r NGO U ZV 161,
TOXICANT ANALYSIS
6/9
Facility Name
Town of Oakboro
Parameter=
Cadmium
Parameter =
Chromium
Pa
S
NPDES #
NC0043532
Standard =
2
pg/l
Standard =
50
pg/I
Qw (MGD)
1.764
7Q1Os (cfs)
3.3
n
BDL=1/2DL
tual Data
RESULTS
n
DL=1/2Dlual
Data
RESULTS
/WC (%)
30.00
1
0.5
<1
Std Dev.
0.2780031
1
1
<2
Std Dev.
1.71
Stream
Rocky River
2
0.5
<1
Mean
0.5857143
2
2
2
Mean
1.46
Stream Class
C
3
0.5
<1
C.V.
0.4746394
3
1
<2
C.V.
1.17
4
0.5
0.5
<1
<1
4
1
<2
_FINAL RESULTS
5
5
1
<2
Cadmium
OK I
3.2
6
7
0.5
0.5
<1
<1
Mult Facto
6
1
<2
Mult Factor =
2.0
_Max. Pred Cw
Allowable Cw
Max. Value
1.6
pg/
7
1
<2
Max. Value
11
pg/I
6.7
8
0.5
<1
Max. Pred
C 3.2_
pg/
pg/
1
<2
Max. Pred Cw
22
pg/I
_
9
0.5
<1
Allowable
C 6.7
_ _8
9
1
<2
Allowable Cw
167
pg/I
Chromium
OK I
10
0.5
<1
10
1
<2
Max. Pred Cw
22
11
0.5
<1
11
1
<2
Allowable Cw
166.7
12
0.5
<1
12
1
<2
13
0.5
<1
13
1
<2
Nickel
OK I
14
0.5
<1
14
1
<2
Max. Pred Cw
13.5
15
1.6
1.6
15
1
<2
Allowable Cw
83.3
16
1.2
1.2
16
1
<2
17
0.5
<1
<1
17
1
<2
Cyanide
LIMIT
18
0.5
18
1
<2
Max. Pred Cw
59.80
19
0.5
<1
19
1
<2
Allowable Cw
16.7
20
0.5
<1
20
1
<2
21
0.5
<1
21
1
<2
Copper
MONITOR
22
22
1
<2
Max. Pred Cw
240
23
23
1
<2
Allowable Cw
23.3
24
24
1
<2
25
25
1
<2
Zinc
MONITOR
26
26
1
<2
Max. Pred Cw
1075
27
27
1
<2
_ Allowable Cw
166.7
28
28
1
<2
29
29
11
11
Lead
OK I
30
30
1
<2
Max. Pred Cw
5.4
31
31
1
<2
Allowable Cw
83.3
32
32
1
<2
33
33
1
<2
Arsenic
OK I
34
34
1
<2
Max. Pred Cw
14.7
35
35
1
<2
Allowable Cw
166.7
36
36
1
<2
37
_
-.__ ----
__-
-
37
1
<2
Silver
MONITOR
38
38
1
<2
Max. Pred Cw
69.7
39
39
2.5
<5
Allowable Cw
0.2
40
40
6
6
41
41
1
<2
Mercury
LIMIT
42
42
4
8
Max. Pred Cw
0.11
43
43
1
<2
Allowable Cw
0.040
44
44
1
<2
eo
45
45
1
<2

TOXICANT ANALYSIS
ameter =
Nickel
Parameter =
Cyanide
Parameter =
Copper
andard =
25
pg/I
Standard =
5
pg/I
Standard =
7
Ng/I
n
DL=1/2DLctual
Dat
RESULTS
n
DL=1/2DLctual
DataRESULTS
n
DL=1/2D.ctual
Data
RESULTS
1
8
8
Std Dev.
1.7353
1
16
16
Std Dev.
6.036
1
37
37
Std Dev.
26.907
2
7
7
Mean
6.4773
2
7
7
Mean
9.857
2
20
20
Mean
35.452
3
5
5
C.V.
0.2679
3
15
15
C.V.
0.612
3
18
18
C.V.
0.759
7
7
4
3
3
4
12
12
5
6
6
5
26
26
5
30
30
6
8
8
Mult Factor =
1.5
6
16
16
Mult Factor =
2.3
6
48
48
Mult Factor =
2.0
7
7
7
Max. Value
9
pg/I
7
11
11
Max. Value
26
pg/I
7
19
19
Max. Value
120
pg/
8
8
8
7
Max. Pred Cw
Allowable Cw
13.5
83.3
pg/I
pg/I
8
10
10
3
Max. Pred Cw
Allowable Cw
59.8
16.7
pg/I
pg/I
8
46
46
Max. Pred Cw
240
pgl
pg/
9
7
9
3
9
16
16
Allowable Cw
23.3
10
6
6
10
4
4
10
14
14
11
7
7
11
9
9
11
19
19
12
6
6
12
5
5
12
55
55
13
7
7
13
10
10
13
36
36
14
5
5
14
9
9
14
23
23
15
4
4
15
8
8
15
33
33
16
6
6
16
3
3
16
31
31
17
2.5
<5
17
19
19
13
--- - 11
17
43
43
18
-- 19
7
7
9
--------
- _
�.
18
19
13
-- - - 11
----
_
18
—_ 19
120
120
9
-- -- ---- --
19
19
20
9
9
20
4
4
20
28
28
21
8
8
21
5
5
21
17
17
22
3
3
22
22
20
20
23
23
23
46
46
24
24
24
12
12
25
25
25
15
15
26
26
26
14
14
27
27
27
25
25
28
28
29
28
29
58
90
58
29
90
30
30
30
30
30
31
31
31
22
22
-- 32
33
-- _
—
- - — --
---
—
32
33
- -
— -
-- -
32
66
66
33
19
19
34
34
34
96
96
35
35
35
42
42
36
36
36
59
59
37
37
37
110
110
38
38
38
15
15
39
1
39
39
17
17
40
40
40
19
19
41
41
41
16
16
42
42
42
14
14
43
43
43
44
44
44
45
45
45

TOXICANT ANALYSIS
Parameter
Zinc
Parameter =
Lead
Parameter =
Arsenic
Standard =
50
Ng11
Standard =
25
pg/1
J
Standard =
50
pg/l
n
DL=1/2D_ctual
Data
RESULTS
n
DL=1/2D
ctual Data
RESULTS
n
DL=1/2D
ctual Dat•
RESULTS
1
79
79
Std Dev.
68.081
1
1
<2
Std Dev.
0.478
1
1
<2
Std Dev.
1.22
2
55
55
Mean
76.029
2
1
<2
Mean
1.143
2
1
<2
Mean
1.64
3
34
34
C.V.
0.8955
3
1
<2
C.V.
0.418
3
1
<2
C.V.
0.75
41
41
4
1
1
<2
<2
4
1
<2
5
60
60
5
5
1
<2
6
73
73
Mult Factor =
2.5
6
1
<2
Mult Factor =
1.8
6
1
<21
Mult Factor =
7
24
24
Max. Value
430
pg/I 7
1
<2
Max. Value
3
pg/1 7
1
<21
Max. Value
Ngl
8
83
83
Max. Pred Cw
1075
pg/I 8
1
<2
<2
<2
Max. Pred Cw
5.4
83.3
pg/I 8
1
<2
Max. Pred Cw
pgl
9
43
430
43
430
Allowable Cw
<- 5/97
166.7
pg/I 9
10
1
1
Allowable Cw
pg/I 9
1
<2
Allowable Cw
.
pgl
10
10
1
<2
11
47
47
11
1
<2
11
1
<2
12
30
30
12
1
<2
12
1
<2
13
52
52
13
1
<2
13
1
<2
14
60
60
14
1
<2
14
1
<2
15
55
55
15
3
3
15
1
<2
16
96
96
16
1
<2
16
1
<21
17
50
50
17
2
21
17
1
<2
18
60
60
18
1
<2
1
18
1
<21
■
19
73
73
19
1
<2
19
2
21
20
57
57
20
1
<2
20
1
<2I
21
58
58
21
1
<2
21
2
21
22
88
88
22
22
2
2
23
45
45
23
23
3
3
24
63
63
24
24
3
3
25
22
22
25
25
7
7
26
31
31
26
26
1
<2
27
92
92
27
27
1
<2
28
110
71
110
28
28
1
<2
29
71
29
_
29
3
3
30
140
140
30
30
1
<2
31
74
74
31
31
2
2
32
120
83
86
120
83
32
33
---- .--
------
- -
-
32
1
<2
33
.� 33
4
4
34
86
34
34
2
2
35
35
■
35
3
3
36
36
36
2
2
37
38
37
38
38
38
39
39
39
40
40
40
--!
41
41
41
--1
43
4243
42
43
43
44
44
44 -
M
45
45
45

TOXICANT ANALYSIS
6/9/98
arameter =
Silver
Parameter =
Mercury
Standard =
0.06
pg/I
Standard =
0.012
pg/I
n
DL=1/2D
_ctual Data
RESULTS
n
DL=1/2D
0.1
.ctual Data
RESULTS
1
1
<2
Std Dev.
3.2312
1
<0.2
Std Dev.
0
2
2
2
Mean
1.8286
2
0.1
<0.2
Mean
0.1
3
1
<2
C.V.
1.767
3
0.1
0.1
0.1
<0.2
C.V.
0
4
1
1
<2
<2
4
5
<0.2
<0.2
5
6
1
<2
Mult Factor =
4.1
6
0.1
<0.2
Mult Factor =
1.1
7
1
<2
Max. Value
17
69.7
0.2
_
pg/I 7
0.1
<0.2
Max. Value
0.1
Ng/
8
1
<2
Max. Pred Cw
pg/I 8
0.1
<0.2
Max. Pred Cw
0.11
pg/
9
1
<2
<2
Allowable Cw
pg/I 9
0.1
0.1
<0.2
<0.2
Allowable Cw
0.0
Ng/
10
1
10
11
1
<2
11
0.1
<0.2
12
17
17
_
12
0.1
<0.2
13
1
<2
- 13
0.1
<0.2
14
1
<2
14
0.1
<0.2
15
12
12
15
0.1
<0.2
16
1
<2
16
0.1
<0.2
17
1
<2.
17
0.1
0.1
0.1
<0.2
18
1
<2
- - 18
<0.2
19
1
<2
19
<0.2
20
1
<2
20
0.1
<0.2
21
1
<2
21
0.1
<0.2
22
1
<2
22
0.1
<0.2
23
1
<2
23
0.1
<0.2
24
1
<2
24
0.1
<0.2
25
1
<2
25
0.1
<0.2
26
1
<2
26
0.1
<0.2
27
1
<2
- - .
-
-
-- -
27
- - 28
- ---- 29
0.1
- 0.1
-
<0.2
__<0.2
-
29
-1
_ <2
--<2
0.1
<0.2
30
1
<2
30
0.1
<0.2
31
1
<2
---- - ---
---
31
0.1
<0.2
32
_ 1
<2
_ _ ---
- --- --
- 32
0.1
- ---0.1
0.1
<0.2
<0.2
33
1
<2
--- 33
34
1
<2
- 34
<0.2
35
2
2
35
0.1
<0.2
36
36
0.1
<0.2
_ 37
37
39
39
40
40
41
41
42
42
43
43
44
44
45
45

•/..45-1or\ o.A.S c-1lo C h n
6/
TOXICANT ANALYSIS
acilityName
Town of Oakboro
Parameter=
Cadmium
_� I Parameter=
Chromium
Parameter=
Nickel
NPDES #
NC0043532
Standard =
2
pg/I
Don't forget to check withStandard =
50
pg/l
Standard =
25
Qw (MGD)
1.764
7Q10s (cfs)
29
n
BDL=1/2DL
tual Data
RESULTS
n
DL=1/2Dival
Data
RESULTS
n
DL=1/2D
IWC (%)
4.60
1
0.5
<1
Std Dev.
0.2780031
1
1
<2
Std Dev.
1.43
1
8
c'ving Stream
Rocky River
2
0.5
<1
Mean
0.5857143
2
2
2
Mean
1.35
2
7
Stream Class
C
3
0.5
<1
C.V.
0.4746394
3
1
<2
C.V.
1.06
3
5
4
0.5
<1
4
1
<2
4
7
FINAL RESULTS
5
0.5
<1
5
1
<2
5
6
Cadmium
OK !
6
0.5
<1
Mult Facto
Max. Value
Max. Pred
Allowable
':' ` .' r?
_ 1.6
C 3.2
C 43.5
6
1
<2
Mult Factor =
2.0
6,
8
ax. Pred Cw
3.2
7
0.5
<1
_ <1
<1
<1
_
pg/
pg/
pg/
7
1
<2
Max. Value
11
pg/I 7
7
Allowable Cw
43.5
8
0.5
8
9
1
<2
Max. Pred Cw
22
pg/l 8
8
_
_
0.5
<2
Allowable Cw
1087
pg/I 9
7
Chromium
OK 1
10
09
.5
10
_1
1
<2
10
6
ax. Pred Cw
22
11
0.5
<1
11
1
<2
11
7
Allowable Cw
1087.0
12
0.5
<1
Linear Interpolation of Mult
12
1
<2
Linear Interpol. of MF
12
6
13
0.5
<1
_
13
1
<2
13
7
Nickel
OK 1
14
0.5
<1
C.V.
0.4746394
14
1
<2
C.V.
1.06
14
5
ax. Pred Cw
13.5
15
1.6
1.6
C.V. lo
0.4
15
1
<2
C.V. lo
1
15
4
Allowable Cw
543.5
16
1.2
1.2
C. V. hi
0.5
16
1
<2
C. V. hi
1.1
16
6
17
0.5
<1
MFhi
1.8
17
1
<2
MFhi
1.3
17
2.5
Cyanide
OK !
18
0.5
<1
MFIo
1.6
18
1
<2
MFlo
1.3
18
7
ax. Pred Cw
60.12
19
0.5
<1
MF=
1.7
19
1
<2
MF=
1.3
19
9
Allowable Cw
108.7
20
0.5
<1
20
1
<2
20
9
21
0.5
<1
21
1
<2
21
8
Copper
MONITOR
22
22
1
<2
22
3
ax. Pred Cw
240
23
23
1
<2
23
Allowable Cw
152.2
24
24
1
<2
24
25
25
1
<2
25
Zinc
OK !
26
26
1
<2
26
ax. Pred Cw
Allowable Cw
1075
27
27
28
1
1
<2
27
1087.0
28
<2
28
29
29
11
11
29
Lead
OK I
30
30
1
<2
30
ax. Pred Cw
5.1
31
32
33
_
31
32
1
1
<2
31
Allowable Cw
543.5
<2
32
33
1
<2
33
Arsenic
OK 1
34
34
1
<2'
34
ax. Pred Cw
14.7
35
35
1
<2
35
Allowable Cw
1087.0
36
36
_ 1
1
<2
36
-- - ---
37
37
_ <2
<2
37
Silver
MONITOR
38
38
1
38
ax. Pred Cw
69.7
39
39
2.5
<5
39
Allowable Cw
1.3
40
40
6
6
40
41
41
1
<2
41
Mercury
OK 1
42
42
4
8
42
ax. Pred Cw
0.11
43
43
1
<2
43
Allowable Cw
0.261
44
45
, _ `_
44
1
<2
44
45
1
<2
45

State o oNoN rth Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
July 28, 1994
The Honorable Fetzer E. Hartsell, Mayor
Town of Oakboro
Post Office Box 610
Oakboro, North Carolina 28129
vi;prittA
�EHN1=1
SUBJECT: Speculative I .imits for Town of Oakboro Wastewater Treatment Plant
NPDES Permit No. NC0043532
Stanly County
Dear Mayor Hartsell:
A speculative analysis for the proposed expansion of the Oakboro Wastewater
Treatment Plant to 0.9 MGD at the existing location on Long Creek and the proposed
relocation of the discharge to the Rocky River has been completed by the Technical Support
Branch. In order to receive final permit limits, a formal application will have to be
submitted to the Division's Permits and Engineering Unit.
In 1993 the Division of Environmental Management (DEM) conducted a study
(excerpts attached) on the Rocky River Watershed to determine the level of treatment which
will protect the dissolved oxygen standard as well as prevent any one discharge from using
up 100 percent of the available assimilative capacity of the river. Results from this study
indicate that any new or expanding discharge in the lower watersheds of the Rocky River
should receive a total Biochemical Oxygen Demand ultimate (BODu = CBOD + NBOD) of
32 mg/1 or less.
Based on available information the tentative limits for conventional constituents are:
Long Creek Rockv River
Summer Winter Summer Winter
Wasteflow (MGD) 0.9 0.9 0.9 0.9
BOD5 (mg/1)* 9 18 9 18
NH3-N (mg/1)* 3 6 3 6
DO (mg/1) 5 5 5 5
TSS (mg/1) 30 30 30 30
Fecal Coliform (#/100m1) 200 200 200 200
pH (SU) 6-9 6-9 6-9 6-9
Chlorine (µg/1) 28 28 28 28
* See attached graph for potential effluent limit combinations.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

-Page 2-
Letter to Mayor Hartsell
It should be noted that the tentative NH3N limits were evaluated and are based on
the protection of Long Creek against instream ammonia toxicity. North Carolina is
currently evaluating all NPDES dischargers for ammonia toxicity and following EPA
guidance to protect the waters for an instream criteria of 1 mg/1 in the summer and 1.8 mg/1
in the winter, under 7Q10 flow conditions. The tentative NH3N and BOD5 limits for the
Rocky River discharge location are based on a BODu of 32 mg/1 or less. To convert
NH3N to NBOD a multiplier of 4.5 is used. Current Division procedure and the
percentage of industrial waste in the effluent yield a CBOD/BOD5 ratio of 2:1. See
attached graph for possible alternative NH3N and BOD5 limits for the Rocky River
discharge location. The Rocky River discharge summer limits for NH3N and BOD5 can
range from NH3N maximum of 4 with a corresponding BOD5 limit of 7 mg/1 to an NH3N
minimum limit of 2 mg/1 with a corresponding BOD5 maximum of 11 mg/1.
In addition, under current DEM procedure, dechlorination and chlorine limits are
now recommended for all new or expanding dischargers proposing the use of chlorine for
disinfection. An acceptable level of chlorine in your effluent is 28 µg/1 to ensure protection
against acute toxicity. The process of chlorination/dechlorination or an alternate form of
disinfection, such as ultraviolet radiation, should allow the facility to comply with the total
residual chlorine limit..
The instream waste concentration (IWC) at the Long Creek location is 30% at 0.90
MGD; the IWC at the Rocky River location is 5% at 0.90 MGD. A chronic toxicity testing
requirement with quarterly monitoring will remain a condition of the NPDES permit for
both discharge locations. The effluent concentration at which there may be no observable
inhibition of reproduction or significant mortality will be based on the IWC at both
discharge locations. A complete evaluation of limits and monitoring requirements for
metals and other toxicants will have to be addressed at the time of formal NPDES
application. Due to the IWC, the effluent limits for the parameters of concern will most
likely be less stringent at the proposed relocation site on the Rocky River then at the
existing location on Long Creek. Information concerning these constituents is not readily
available but the Town can assume that effluent limits and/or monitoring for chromium,
nickel, lead, cyanide, mercury, copper, zinc, fluoride, sulfide, aluminum, arsenic, iron,
manganese, selenium, tin, oil and grease, MBAS, and silver should be included.
DEM has implemented a statewide basin water quality management initiative. Our
schedule for implementation in the Yadkin River Basin is set for 1998. The plan will
attempt to address all sources of point and nonpoint pollutants where deemed necessary to
protect or restore water quality standards. In addressing interaction of sources, wasteload
allocations may be affected. Those facilities that already have committed to high levels of
treatment technology are least likely to be affected.

Page 3-
Letter to Mayor Hartsell
This information should provide some assistance in your planning endeavors. As
previously mentioned, final NPDES effluent limitations will be determined after a formal
permit application has been submitted to the Division. If there are any additional questions
concerning this matter, please feel free to contact Ruth Swanek or Michelle Wilson of my
staff at [phone].
DLS/MMW
cc: Municipal Engineering Services Co.,
Mooresville Regional Office
Permits and Engineering Unit
Central Files
nald L. S • r t,
Assistant Chief for Tec upport
Water Quality Section
P.A.; David Dickenson, P.E.

vil1ALIONJ AND TORINO i' Qu1 RE 1ENrS FINAL `
Permit No. NC.UU43j3,%
During the period beginning on the effective date of the permit and lasting until relocation of the discharge or expiration, the Permittee is
authorized to discharge from outfall(s) serial number 001 (Long Creek). Such discharges shall be limited and monitored by the permittee as
specified below:
Effluent Characteristics Discha[ge Limitations Monitoring Requirements'
Measurement Sample *Sample
Monthly Avg. Weekly Avg. Daily Max Frequency Type Location
' '','i% 0.50 MGD Continuous Recording I or E
IOD, 5 day, 20°C" 30.0 mg/I 45.0 mg/I 3/Week Composite E, I
'rsS„ 30.0 mg/I 45.0 mg/I 3/Week Composite E, I
N:H3 as N 3/Week Composite E
Dissolved Oxygen*" 3/Week Grab E, U, D
• -=.cal Coiiform (geometric mean) 200.0 /100 ml 400.0 /100 ml 3/Week Grab E,U,D
::•.ta1 Resid,_ral Chlorine 3/Week Grab E
i ,. ,nperatur e , Daily Grab E, U, D.
Total Nitrogen (NO2 + ;••!r:.):• + TKN) Quarterly Composite E
Total Phosphorus Quarterly Composite E
( .'rtductiviiy 3/Week Grab E,U,D
-I'S; ilplc locations: E - Effluent, 1 - influent, 1..1 • Upstream 10() feet. above discharge point, D - Dowi1strearn below the discharge at. NCSR
----:. 19 ; Upstream and downstream samples shall be grab samples. Stream samples shall be collected three times per week during June, July,
August, and September and once per week during the remaining months of the year.
**The monthly average effluent BODS and TS:: concentrations shall not exceed 15 % of the respective influent value (85 % removal)
.,-* The. daily average -effluent dissolved oxygen concentration shall not be less than 6.0 mg/l.
***Chronic Toxicity (Ceriodaphnia) P/E at 1.9%; January, April, July, and October; See Part III, Condition G. j
The pH Shrill not he less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored 3/week at the effluent by grab
sample.
There shall he no discharge of floating solids or visible foam in other than trace amounts.
v,

.. �. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0043532
During the period beginning on the effective date of the permit and lasting until relocation of the discharge or expiration, the Permittee is
authorized to discharge from outfall(s) serial number 001 (Long Creek). (Continued)
(fluent Characteristics
•
C.nronic
Mercury
Chromium
i :�c kol
Copper
Silver
Arsenic
Discharge Limitations
Units (specify) Measurement
Monthly Avg. Weekly Avg. Daily * Max Frequency
Quarterly
.(9 µg/I W Y a(tbn'
263:thug/I W May ``
4 3-0' ! I.. i IY •
1- ta r�� u g / I WY
eekl ‘,
.26.0 ug/I Weekly
2/Month
2/Month
2/Month
Monitoring Requirements
Sample *Sample
Type Location
Composite E
Composite E
Composite E
Composite E
Composite E
Grab E
Composite E
Composite E
Composite E
Composite

Monitoring
Measurement
Frequency
Continuous
3/Week
3/Week
3/Week
3/Week
3/Week
3/Week
Daily
Quarterly
Quarterly
3/Week
*Sam plc locations: E - Effluent, I - Influent, U - Upstream 100 feet, D - Downstream 1.7 miles
or nearest point). Upstream and downstream sa!nples shall be grab samples. Stream samples shal
.tune, July, August, and September and once per week during the remaining months of the year.
•1
=
MonthlyWeekly Avg. Daily Max
MGD
30.0 mg/I 45.0 mg/I
30.0 mg/I 45.0 mg/I
200.0 /100 mi 400.0 /100 .ml
NIOND:01.Z G REQUIREMENTS FINAL
ANDPerrnit No. NC0043532
During the period beginning upon relocation of the discharge and lasting until expiration, the Permittee is authorized to discharge from outfall(s)
P
serial number 002 (Rocky River). Such discharges shall be limited and monitored by the permittee as specified below:
F_f11.4tPU�_Chau cteca Discharge limitations
Flow
BOD, 5 day, 20°C"
T S S '
NH3 as N
Dissolved Oxygen"*
U ca! Coliform (geometric mean)
lesid.ral Chlorine
I Hnperatui e.
o!al Nit. og :In (NO2 + NO3+ TKN)
.)taI Phos►chorus
from'discharge
1 be collected
Requirements
Sample
Type
Recording
Composite
Composite
Composite
Grab
Grab
Grab
Grab
*Sample
Location
I or E
E, I
E, I
E
E, U, D
E,U,D
E
Composite E
Composite E
Grab
U, D
D
point'(the end of NCSR 1659
three times per week during
**The monthly average effluent BOD5 and TSS concentrations shall not exceed 15 % of the respective influent value (85 % removal).
** r The daily average effluent dissolved oxygen concentration shall not be less than 6.0 mg/I.
*** Chronk toxicity (Ceriodaphnia) P/F at 2.6%;January, April, July and October; See Part III, Condition H.
The pII shall not be less than 6.() standard units nor greater than 9.0 standard units and shall be monitored 2/month at the
saniple, e effluent by grab
There shall be no discharge of floating solids or visible foam in other than trace amounts.

. u. L;t i LII ;N'i' LiMI'i'A i .IOiNS AND MON.ETORINti REQUIREMENTS FINAL Permit No. NC0043532
During the period beginning upon relocation of the discharge and lasting until expiration, the Permlttee is authorized to discharge from outfall(s)
serial number 002 (Rocky River). (Continued)
Eifiuept Characteristics Discharge Limitations Monitoring Requirements
Units (specify) Measurement Sample *Sample
Monthly Avg. Weekly Avg. Daily Max Frequency Type Location
Arsenic 2/Month Composite E
Chromium 2/Month Composite E
""}`el 2/Month Composite E
Lead 368 a ug/l ekly z/ n•N • Composite E
Cyanide ''�
74,.0'"u g/I 1N611.kly Grab E
nwrei 2/Month Composite E
'j'`'c 2/Month Composite E
:;duet 2/Month Composite E
Chronic 'Toxicity`"' Quarterly Composite E
'.`.%rcury f
0.1,77 µ g/ I WOy Z /�r1^- Composite E

SOC PRIORITY PROJECT: Yes No X
If Yes, SOC No.
To: Permits and Engineering Unit
Water Quality Section
Attention: Mary Cabe
Date: September 30, 1997
NPDES STAFF REPORT AND RECOMMENDATION
County: Stanly
Permit No. NC0043532
PART I - GENERAL INFORMATION
1. Facility and Address: Town of Oakboro
Post Office Box 610
Oakboro, North Carolina 28129
2. Date of Investigation: September 29, 1997
3. Report Prepared By: Samar Bou-Ghazale, Env. Engineer I
4. Persons Contacted and Telephone Number: Mr. Larry Branch, ORC;
704/485-4613
5. Directions to Site: From the intersection of NC Highway 138
and SR 1953 east of the Town of Oakboro, travel northeast on
SR 1953 (Barbees Grove Road) approximately 2.20 miles to the
junction with a paved road (no road name or number). The WWTP
is located approximately 0.3 mile north of the junction, at
the end of the paved road.
6. Discharge Point(s). List for all discharge points:
Latitude: 35°14'02" Longitude: 80°16'02"
Attach a U.S.G.S. map extract and indicate treatment facility
site and discharge point on map.
U.S.G.S. Quad No.: G 17 NE U.S.G.S. Name: Oakboro, N.C.
7. Site size and expansion are consistent with application?
Yes x No If No, explain:
8. Topography (relationship to flood plain included): Sloping
east towards receiving stream at the rate of 5 to 10%; the
WWTP is not in a flood plain.

9 Location of nearest dwelling: One dwelling is located about
1,000 feet from the WWTP.
10. Receiving stream or affected surface waters: Long Creek.
a. Classification: C
b. River Basin and Subbasin No.: Yadkin; 03-07-13
c. Describe receiving stream features and pertinent
downstream uses: The receiving stream is a moderate size
creek with a rocky bottom. Downstream users are unknown.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater to be permitted: 0.9 MGD (Ultimate
Design Capacity)
b. What is the current permitted capacity of the wastewater
treatment facility? 0.5 MGD
c. Actual treatment capacity of the current facility
(current design capacity)? 0.5 MGD
d. Date(s) and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years: N/A
e. Please provide a description of existing or substantially
constructed wastewater treatment facilities: The
existing facilities consist of a manual bar screen,
aerated grit chamber, comminutor (not in use),
instrumented flow measurement, dual aeration basins with
mechanical aerators (one aeration basin is used as a
sludge holding basin), dual clarifiers, dual 12,750
gallon aerated sludge digesters, chlorine disinfection,
dual sludge drying beds, and standby power.
f. Please provide a description of proposed wastewater
treatment facilities: The proposed addition to the
existing plant has not been submitted at this time. The
design for the treatment plant expansion and supporting
calculations will be submitted with the plans and
specifications at a later date.
g•
Possible toxic impacts to surface waters: N/A
h. Pretreatment Program (POTWs only): Approved
2. Residuals handling and utilization/disposal scheme:
a. If residuals are being land applied, please specify DWQ
Permit No.: WQ0005387
Residuals Contractor: BioGro, Inc.

Telephone No.: [phone]
b. Residuals stabilization: PSRP: X
RERP
Other:
3. Treatment plant classification (attach completed rating
sheet): Class III
4 SIC Code(s): 4952
Wastewater Code(s) of actual wastewater, not particular
facilities, i.e., non -contact cooling water discharge from a
metal plating company would be 14, not 56.
Primary: 01 Secondary: 55
Main Treatment Unit Code: 02003
PART III OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any public monies involved (municipals only)?
Public monies will be used in the construction of any
additional WWT facilities.
2. Special monitoring or limitations (including toxicity)
requests: N/A
3. Important SOC, JOC or Compliance Schedule dates: (please
indicate) N/A
4 Alternative Analysis Evaluation: Has the facility evaluated
all of the non -discharge options available. Please provide
regional perspective for each option evaluated. N/A.
Air Quality and/or Groundwater concerns or hazardous materials
utilized at this facility that may impact water quality, air
quality, or groundwater: No AQ or GW concerns nor are
hazardous materials utilized at this facility.
Other Special Items:
PART IV - EVALUATION AND RECOMMENDATIONS
The Town of Oakboro is requesting a flow expansion from their
existinc c=rmitted limit of 0.500 MGD to 0.900 MGD. The Town is
also planning to discharge from its WWTP into the Rocky River.
However, Town proposes to keep the discharge point to Long
Creek as a back up. This Office has no objections to the Town
maintainin.,c the discharge point into Long Creek as long as the Town
can continue to meet the waste load allocation limits established
for Lona Creek.

4.1
Pending a review and approval of the WLA, it is recommended
that the permit modification request from 0.500 MGD to 0.900 MGD be
approved.
rt Preparer
Water Quality Regional
Supery
s
1
0,2'6
Date

1730"
565
OAKBORO QUADRANGLE
NORTH CAROLINA
7.5 MINUTE SERIES (TOPOGRAPHIC)
566 1 620 000 FEET s67 s68 80°15'
35°15'
/51//t/(-4' •
.VsoiA p;irE
540 00
FEET k
3°98
1L4
(ROCiZT RVEg
P,G1)05-6—P
Ogalab6
Ic`N
t\(,

NC0043532
Town of Oakboro WWTP
Long Creek Class C
Residual Chlorine
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVE
IWC (%)
Allowable Concentration
Fecal Limit
Ratio of 4.3 :1
3.3
0.5
0.775
17.0
0
19.02
89.39
Ammonia as NH3
(summer)
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVI
IWC (%)
Allowable Concentration
Ammonia as NH3
(winter)
7Q10 (CFS)
200/100mI DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVI
IWC (%)
Allowable Concentration
3.3
0.5
0.775
1.0
0.22
19.02
4.32
5.8
0.5
0.775
1.8
0.22
11.79
13.62

NC0043532
Town of Oakboro WWTP
Long Creek Class C
Residual Chlorine
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVE
IWC (%)
Allowable Concentration
Fecal Limit
Ratio of 2.4 :1
3.3
0.9
1.395
17.0
0
29.71
57.22
Ammonia as NH3
(summer)
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVI
IWC (%)
Allowable Concentration
Ammonia as NH3
(winter)
7010 (CFS)
200/100mI DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVI
IWC (%)
Allowable Concentration
3.3
0.9
1.395
1.0
0.22
29.71
2.85
5.8
0.9
1.395
1.8
0.22
19.39
8.37

NC0043532
Town of Oakboro WWTP
Rocky River Class C
Residual Chlorine
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVE
IWC (%)
Allowable Concentration
Fecal Limit
Ratio of 37.4 :1
29
0.5
0.775
17.0
0
2.60
653.13
Ammonia as NH3
(summer)
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVI
IWC (%)
Allowable Concentration
Ammonia as NH3
(winter)
7Q10 (CFS)
200/100m1 DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVI
IWC (%)
Allowable Concentration
29
0.5
0.775
1.0
0.22
2.60
30.19
51
0.5
0.775
1.8
0.22
1.50
105.77

NC0043532
Town of Oakboro WWTP
Rocky River Class C
Residual Chlorine
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVE
IWC (%)
Allowable Concentration
Fecal Limit
Ratio of 20.8 :1
29
0.9
1.395
17.0
0
4.59
370.41
Ammonia as NH3
(summer)
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVI
IWC (%)
Allowable Concentration
Ammonia as NH3
(winter)
7Q10 (CFS)
200/100m1 DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVI
IWC (%)
Allowable Concentration
29
0.9
1.395
1.0
0.22
4.59
17.22
51
0.9
1,395
1.8
0.22
2.66
59.56