NC0021865_Special Order by Consent_19970805

NPDES DOCUMENT SCANNING COVER SHEET
NPDES Permit:
NC0021865
Chadbourn WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
5-reci/ r4„- 6-.9-6-4 /-
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
August 5, 1997
This document is printed on reuse paper - ignore any
content on the reYerse side

DIVISION OF WATER QUALITY
Wilmington Regional Office
August 5, 1997
MEMORANDUM
TO: Mike Alexander
FROM: Russ Colby
THROUGH: Rick Shiver, P.G.
SUBJECT: Special Order By Consent SOC EMC WQ No. 90-30 AdiII
Town of Chadbourn
NPDES Permit No. NO0021865
Columbus County
Attached please find a copy of the revised draft SOC EMC WQ No. 90-
30 AdiII prepared by Russ Colby.
Attached are the recommendations from the Rapid Assessment Group.
The Wilmington Regional Office agrees that more rigorous instream
monitoring is required, which the draft SOC reflects. A second
downstream monitoring point has been established. The Downstream
(1) monitoring point should be at least 300' below discharge and
not 1000' due to inaccessibility. I have spoken with Farrell
Keough of the Rapid Assessment Group and he agrees.
The Wilmington Regional Office also feels that the facility can
meet a BOD5 limit of 25 mg/1 monthly average and a 37.5 mg/1 weekly
average.
The facility has been reclassified as a Class II plant by the
Permits and Engineering Unit. The draft SOC monitoring frequencies
have been modified to reflect this change. A ratings sheet and the
revised NPDES Permit is attached.
If you have any further questions please contact Russ Colby
[phone] ext. 219.
cc: Farrell Keough, Rapid Assessment Group
Wilmington Regional Office
RSS:GRC S\WQS\SOC\NC21865.MEM

NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
COUNTY OF COLUMBUS
IN TfE MATTER OF
NORM CAROLINA
NPDES PERMIT
NUMBERNC0021865
HELD BY THE TOWN
OF CHADBOURN
SPECIAL ORDER BY CONSENT
EMC SOC WQ 90-30 AdIII
Pursuant to provisions of North Carolina General Statutes (G.S.) 143-215.2 and
143-215.67, this Special Order by Consent is entered into by the Town of Chadbourn, hereinafter
referred to as the Town, and the North Carolina Environmental Management Commission, an
agency of the State of North Carolina created by G.S. 143B-282' and hereinafter referred to as
the Commission:
1. The Town and the Commission hereby stipulate the following:
(a) The Town holds North Carolina NPDES Permit Number NC0021865. for operation of
an existing wastewater treatment works and for making an outlet therefrom for treated
wastewater to Soules Swamp, Class "C Swamp" waters of this State in the Lumber
River Basin, but is unable to consistently comply with final effluent limitations for Flow,
and BOD5, as set forth in NPDES Permit Number NC0021865. Compliance will require
preparation of plans and specifications for construction and operation of additional
treatment works.
(b) Noncompliance with final effluent limitations constitutes causing and contributing to
pollution of the waters of this State named above, and the Town is within the
jurisdiction of the Commission as set forth in G.S. Chapter 143, Article 21.
•
(c) The Town desires to cause or allow the discharge of 0.025 MGD of additional
wastewater to the treatment works, and the discharge of such additional wastewater will
not result in any significant degradation to the quality of any waters.
(d) The Town will secure financing for planning, design and construction of an improved
waste disposal system which, once constructed and operated; will be sufficient to
adequately treat wastewater presently being discharged and the additional wastewater
desired to be discharged, to the extent that the Town will be able to comply with final
effluent permit hmitatioris.
(e) Since this Special Order is by Consent, neither party will file a petition for a contested
case or for judicial review concerning its terms.
2. The Town desiring to comply with the Permit identified in paragraph 1(a) above, hereby
agrees to do the following:
(a) Provide the Wilmington Regional Office of the North Carolina Division of Water
Quality (DWQ), located at 127 Cardinal Drive Extension, Wilmington, N.C. 28405,
with a list of all additions of flow under the Town's Special Order by Consent, and
update this list each time flow is added to the system.

(b) Undertake the following activities in' accordance with the indicated time schedule:
1) Submit complete plans and specifications for repairs to existing facilities and/or
construction of replacement sewers which will when completed remove excessive
infiltration and inflow from the Town's sewer collection system on or before
September 30, 1991; (Met)
2) -Complete repairs and/or replacement sewers on or before September 30. 1992;
(Met)
3) Complete storm drainage improvements within the Town and eliminate the cross
'connections with the sanitary sewer system so. as to reduce inflow on or before
October 31, 1994; (Met)
4) Retest sewer collection system to determine effectiveness of infiltration and inflow
removal on or before March 31, 1995;• (Met)
Determine the actual capacity necessary for the Town's wastewater treatment
plant on or before May 31, 1995; (Met)
6) If the existing facilities are determined to have adequate capacity to serve the
Town's needs; the Town will request termination of this Order on or before
May 31, 1995;
7) Select adequate effluent disposal location and receive a wasteload allocation on or
'before October 31, 1995; (Met)
8) Submit complete plans and specifications for improvements to the existing
wastewater treatment. f•
acility on or before December 31, 1996; (Met)
9) Submit a progress report addressing steps made towards the replacement and/or
rehabilitation of sewer lines to reduce or eliminate inflow and infiltration by
October 1, 1997 and Quarterly thereafter during the term of this Order .
10) Obtain funding needed for the construction of facilities to upgrade the existing
wastewater treatment facility on or before December li 1997.
11) Award contracts for the construction of facilities to upgrade the existing
wastewater treatment facility on or before March 1, 1998.
12) Complete co ction of facilities to upgrade the Town's wastewater treatment
facility on or before July 1, 1999.
13) Comply with the final effluent limitations contained in NPDES Permit No.
NC0021865 on or before September 1, 1999.
(c) The Town shall comply with all terms and conditions of the permit except those effluent
limitations identified in paragraph 1(a) above. See Attachments A, B, and C for all
monitoring requirements and effluent limitations. The Permittee may also be required to
monitor for other parameters as deemed necessary by the Director in future permits or
administrative letters.

(g)
(h)
(i)
(d) During the time in which this Special Order by Consent is effective, the Town shall
comply with effluent limitations as contained in Attachments A, B and C.
Under this Special Order by Consent, ONLY the parameters listed below have been
modified from the most current NPDES Permit currently in effect.
Pipe Number 001
Permit Limitations Modified Limitations (SOC)
Parameters Unit Monthly ,Avg., Weekly Avg., Monthly ,Avg., Weekly Avg.
Flow MOD 0.50 • 0.82
BOD5 mg/1 5.0/6.0 7.5 25 37.5
(e) No later than fourteen (14). calendar days after any date identified for accomplishment of
any activity listed in 2(b) above_ submit to the Director of DWQ written notice of,
compliance or noncompliance therewith. In the case of noncompliance, the notice shah
include a statement of the reason(s) for noncompliance, remedial action(s) taken, and 4
statement identifying the extent to which subsequent dates or times for accomplishment
of listed activities may be affected.
(f) Enforce the North Carolina State Building Code as it applies to Water Conservation
(Volume II Plumbing, Chapter 9 901 General Requirements -Materials, 901.2 Water
Conservation, and Table 901.2.2-Maximum Allowable Water Usage For Plumbing
Fixtures).
Develop and adopt sewer use ordinance limitations for non -conventional pollutants.
Implement the pretreatment program as approved by the Director, including the
enforcement of both categorical pretreatment standards and local limits.
Identify any infiltration and inflow problems associated with the facility and establish a
program to correct.
Use forty percent (40%) of the revenue received by a municipality from additional one-
half (1/2%) sales and use taxes levied during the first five (5) fiscal years in
which the additional taxes are in effect in the municipality and thirty percent (30%) of
the revenue received by a municipality from these taxes in the second five (5) fiscal years
in which the taxes are in effect in the municipality for water and sewer capital outlay
purposes or to retire any indebtedness incurred by the municipality for these purposes.
3. The Town agrees that unless isxcused under paragraph four (4), the Town will pay the
Director of DWQ, by check payable to the North Carolina Department of Environment,
Health and Natural Resources, stipulated penalties according to the following schedule for
failure to meet deadlines set out in paragraphs 2(b) and 2(e), or failure to attain compliance
with the effluent hmitations/monitoring requirements contained in Attachments A, B, and C.
Failure to meet a schedule date $100/day for the first 7
days; $500/day
thereafter
Failure to maintain compliance with $I000/violation
any modified limit contained in the SOC.

Failure to achieve compliance with final
effluent limitations at final compliance deadline
Monitoring frequency violations
Monitoring frequency violations
(for Toxicity)
Failure to submit progress reports
•
$1820.00
$100 per omitted value
per parameter
$1,000 per omitted value
per parameter
$50/day for the first seven (7)
days; $250/day thereafter
4. The Town and the Commission agree stipulated penalties are not due if the Town satisfies the
Division of Water Quality noncompliance was caused solely by:
a. An act of God;
b. An act of war,
c. An intentional act or omission of a third party, but this defense shall not be available if
the act or omission is that of an employee or agent of the defendant or if the act or
omission occurs in connection with a contractual relationship with the Permittee;
d. An extraordinary event beyond the Permittee's control. Contractor delays or failure to
obtain funding will not be considered as events beyond the Pernittee's control; or
e. Any combination of the above causes.
Failure within thirty (30) days of receipt of written demand to pay the penalties, or challenge
them by a contested case petition pursuant to G.S. 150B-23, will be grounds for a collection
action, which the Attorney General is hereby authorized to initiate. The only issue in such an
action will be whether the thirty (30) days has elapsed.
5. In accordance with provisions of G.S. 143-215.67(b) the Commission allows the Town to
accept the additional waste specified below to its waste disposal system:
0.025 MGD of additional wastewater. The nature of the additional flows is such that the
waste characteristics do not exceed those generally associated with domestic waste or are
pretreated to domestic strengths. Waste of greater than normal domestic strength may be
accepted if the parameter(sYtthat exceed normal domestic strength wastewater are not those
for which interim limitations 4.ve been developed and it can be demonstrated to the
satisfaction of the Director the'additional waste will not adversely affect the treatment
efficiency of the treatment system for any modified parameter or result in the violation of any
other permit limitation. All new and proposed industrial waste tributary to the system must be
controlled using all needed mechanisms including but not limited to adoption and
implementation of industrial waste control and pretreatment ordinances. No wastewater can
be accepted which will add toxic pollutants in quantities not generally associated with
domestic wastewater characteristics, unless the acceptance of the additional wastewater can
be supported through appropriate analyses acceptable to the Director.

6. This Special Order by Consent and any terms conditions and interim effluent limitations
contained herein, hereby supersede any and all previous Special Orders, Enforcement
Compliance Schedule Letters, terms, conditions, and limitations contained therein issued in
connection with NPDES Permit No. NC0021865. In the event of an NPDES Permit
modification or renewal, any effluent limitations or monitoring requirements contained therein
shall supersede those contained in Attachment A, B, and C of this Special Order by Consent,
except as modified and contained idparagraph 2.(d) above.
7. Any Violation of terms of this Special Order by Consent, including paragraphs 2(b) and 2(e)
above and Attachments A, Bs and C shall terminate paragraph five (5) of this Order and any
authorized additional waste not previously connected to the system shall not thereafter be
connected until the necessary sewerage system improvements have been completed and placed
in operation.
8. Noncompliance with the terms of this Special Order by Consent are subject to enforcement
action in addition to the above stipulated penalties, including injunctive relief pursuant to G.S.
143-215.6.(C).
9. The Permittee. upon signature of this Special Order by Consent. will be expected to comply
with all schedule dates. terms, and conditions of this document.
10. This Special Order by Consent shall expire December 1,1999.
For the Town of Chadbourn:
Print Name and Title of Signing Official
Signature.of Signing Official
Date
For the North Carolina Environmental Management Commission:
Chairman of the Commission
Date

EMC SOC WQ 90-30 AdIn
Attachment A
Town of Chadbourn
NPDES Permit Number NC0021865
Columbus County
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - SUMMER (April 1- October 31)
During the period beginning on the effective date of this Special Order and lasting until December 1, 1999, the
Permittee is authorized to discharge from outfall serial number 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
Effluent Characteristics Discharge Limitations Monitoring Requirements
Units as Specified Measurement Sample *Sample
Monthly Average Weekly Avg. Frequency Type Location
Flow 0.820 MGD Continuous Recording I or E
BOD, 5 day. 20°C** 25.0 mg/1 37.5 mg/I Weekly Composite E
Total Suspended Residue** 30.0 mg/1 45.0 mg/1 Weekly Composite I,E
Dissolved Oxygen* * * Weekly Grab E
Dissolved Oxygen* 3/Week Grab U,D
Fecal Coliform 200.0/100 ml 400.0/100 ml Weekly Grab E,U,D
(geometric mean) "
Total Residual Chlorine 2/Week Grab E
Temperature, °C Daily Grab E
Temperature, °C* 3/Week Grab U,D
Total Phosphorus Quarterly Composite E
Chronic Toxicity* * * * Quarterly Composite E
* Sample Location: I -Influent E-Effluent, U Upstream at least 100' (SR 1005), D-Downstream (1) at least
300' below discharge and above Benson Mill Pond in the main channel, Downstream (2) below discharge and
below Benson Null Pond (SR 1429). Upstream and downstream samples for D.O. and Temperature 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 TSS concentrations shall not exceed 15% of the respective influent
value (85% removal).
* * * The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/1.
* * * * Chronic (Ceriodaphnia) P/F at 84%; March, June, September, December, See Supplement to Effluent
Limitations and Monitoring Requirements - Special Conditions page.
The pH shall not be 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 be no discharge of floating solids or visible foam in other than trace amounts.
The Permittee may also be required to monitor for other parameters as deemed necessary by the Director in
future permits or Administrative Letters.
Note: Parameters underlined and noted in bold lettering above are the only parameters modified as part
of this Special Order by Consent (SOC).

EMC SOC WQ 90-30 AdIIl
Attachment A
Town of Chadbourn
NPDES Permit Number NC0021865
Columbus County
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - SUMMER (April 1- October 31)
During the period beginning on the effective date of this Special Order and lasting until December 1, 1999, the
Permittee is authorized to discharge from outfall serial number 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
Effluent Characteristics
Conductivity
NH3 as N
Cadmium
Nickel
Lead
Copper
Zinc
Discharge Limitations Monitoring Requirements
Units as Specified Measurement
Monthly Avg. Daily Max Frequency
Weekly
2.0 mg/1 Weekly
2.4 ,ag/1 Weekly
105.0 ,ug/1 Weekly
30.0 Ag/1 Weekly
Total Nitrogen (NO2 + NO3 + TKN)
2/Month
2/Month
Quarterly
Sample *Sample
T Location
Grab E,U,D
Composite E
Composite E
Composite E
Composite E
Composite E
Composite E
Composite E
* Sample Location: I -Influent, E-Effluent, U Upstream at least 100' (SR 1005), D-Downstream (1) at least
300' below discharge and above Benson Mill Pond in the main channel, Downstream (2) below discharge and
below Benson Mill Pond (SR 1429). Upstream and downstream samples for D.O. and Temperature 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 Permittee may also be required to monitor for other parameters as deemed necessary by the Director in
future permits or Administrative Letters.
Note: Parameters underlined and noted in bold lettering above are the only parameters modified as part
of this Special Order by Consent (SOC).

EMC SOC WQ 90-30 AdDI
Attachment B
Town of Chadbourn
NPDES Permit Number NC0021865
Columbus County
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - WINTER (November 1- March 31)
During the period beginning on the effective date of this Special Order and lasting until December 1, 1999, the
Permittee is authorized to discharge from outfall serial number 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
Effluent Characteristics Discharge Limitations Monitoring Requirements
Units as Specified Measurement Sample *Sample
Monthly Avg. Weekly Avg. Frequency Type Location,
Flow 0.820 MGD Continuous Recording J or E
BOD. 5 day. 20°C** 25.0 mg/I 37.5 mg/I Weekly Composite I,E
Total Suspended Residue** 30.0 mg/1 45.0 mg/1 Weekly Composite I,E
Dissolved Oxygen* * * Weekly Grab E,U,D
Fecal Coliform 200.0/100 ml 400.0/100 ml Weekly Grab E,U,D
(geometric mean)
Total Residual Chlorine 2/Week Grab E
Temperature, °C Daily Grab E
Temperature, °C* Weekly Grab U,D
Total Phosphorus Quarterly Composite E
Chronic Toxicity* * * * Quarterly Composite E
* Sample Location: I -Influent, E-Effluent,U-Upstream at least 100' (SR 1005), D-Downstream (1) at least
300' below discharge and above Benson Mill Pond in the main channel, Downstream (2) below discharge and
below Benson Mill Pond (SR 1429). Upstream and downstream samples for D.O. and Temperature 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 BOD5 and TSS concentrations shall not exceed 15% of the respective influent
value (85% removal).
* * * The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/l.
* * * * Chronic (Ceriodaphnia) P/F at 84%; March, June, September, December; See Supplement to Effluent
Limitations and Monitoring Requirements - Special Conditions page.
The pH shall not be 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 be no discharge of floating solids or visible foam in other than trace amounts.
The Permittee may also be required to monitor for other parameters as deemed necessary by the Director in
future permits or Administrative Letters.
Note: Parameters underlined and noted in bold lettering above are the only parameters modified as part
of this Special Order by Consent (SOC).

EMC SOC WQ 90-30 AdIII
Attachment B
Town of Chadbourn
NPDES Permit Number NC0021865
Columbus County
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - WINTER (November 1- March 31)
During the period beginning on the effective date of this Special Order and lasting until December 1, 1999, the
Permittee is authorized to discharge from outfall serial number 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
Effluent Characteristics
Conductivity
NH3 as N
Cadmium
Nickel
Lead
Copper
Zinc
Discharge Limitations Monitoring Requirements
Units as Specified Measurement
Monthly Average Daily Max Frequency
Weekly
4.0 mg/1 Weekly
2.4 4ug/1 Weekly
105.0 icg/1 Weekly
30.0 ,ug/1 Weekly
Total Nitrogen (NO, + NO3 + TKN)
2/Month
2/Month
Quarterly
Sample *Sample
Type Location
Grab E,U,D
Composite
Composite
Composite E
Composite E
Composite E
Composite E
Composite E
E
E
* Sample Location: I -Influent, E-Effluent, U-Upstream at.least 100' (SR 1005), D-Downstream (1) at least
300' below discharge and above Benson Mill Pond in the main channel, Downstream (2) below discharge and
below Benson Mill Pond (SR 1429). Upstream and downstream samples for D.O. and Temperature 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 Permittee may also be required to monitor for other parameters as deemed necessary by the Director in
future permits or Administrative Letters.
Note: Parameters underlined and noted in bold lettering above are the only parameters modified as part
of this Special Order by Consent (SOC).

EMC SOC WQ 90-30- AdDi
Attachment C
Town of Chadbourn
NPDES Permit No. NC0021865
Columbus County
CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
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 84.0% (defined as treatment two in the procdure 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 ofMarch, June, September, and December. Effluent sampling for this
testing shall be performed at the NPDES permitted final discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Forrii (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 form 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 monitoringisthen
monitoringwill. begin required, monthly
gin 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 surviv
al, val, 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.

North Carolina Division of Water Quality
Water Quality Section / Rapid Assessment Group
July 14, 1997
MEMORANDUM
To: Russell Colby,\ Wilmington -Regional Office
From: Farrell Keou
Through: Carla Sanderson
Ruth Swanek
Subject: Special Order by Consent
Town of Chadbourn Waste Water Treatment Plant
NC0021865 Soules Swamp [03-07-58]
Columbus County Wilmington Region
Summary
An SOC limit evaluation for the Town of Chadbourn has been completed by the Instream Assessment
Unit, (IAU). The Wilmington Regional Office has requested this instream assessment due to the facility's
inability to consistently meet its flow and BOD5 limits and the facility's request to add 0.025 mgd of flow
to the existing discharge. In 1991 the facility went under an SOC for sewer rehabilitation projects to
control I & I. This was amended in 1993 which allowed for an extension in the schedule dates. In 1996
an expansion request was approved, but funding for the project was not acquired.
The monthly average discharge from the Chadbourn WWTP in the last year was 0.795 mgd. Adding the
requested 0.025 mgd additional flow to the facility's monthly average over the past year yields a requested
SOC flow of 0.820 mgd. This SOC request is being made because the facility has had difficulty in
securing funding for construction of an additional clarifier, aeration basin, aerobic digester, tertiary filter
and chlorine contact basin with dechlorination capability. Repairs to the collection system to reduce I & I
are also proposed to take place
Evaluation & Discussion
The Town of Chadbourn discharges into Soules Swamp, a class "C - Swamp" waterbody in the Lumber
River Basin. The discharge is just above a swampy area and Benson Mill Pond. Based upon USGS
estimates, the flows for the discharge site are as follows:
summer 7Q10 flow = 0.15 cfs
winter 7Q10 flow = 0.2 cfs
Average flow = 6.0 cfs
30Q2 flow = 0.2 cfs
The stream segment where Chadbourn discharges is slow moving with a bed gradient of approximately 5
feet per mile for at least five miles with a pond, (Benson Mill Pond) located approximately one and one-
third miles below the discharge. It should be noted that substandard dissolved oxygen levels currently
exist in this watershed.

Town of Chadbourn SOC, NC0021865
Instream data taken by the Chadbourn WWTP staff during the summer of 1993 reveals instream dissolved
oxygen levels at 1.6 mg/1 both above and below the discharge. Instream monitoring was not taken in 1995
and 1996, even though required by the permit. Much of this system is swamp -like and low dissolved
oxygen levels may be due in part to natural conditions; numerous beaver dams and fallen trees exist in this
area. Removal of many of these beaver dams is also proposed as part of this SOC. The downstream site,
while still displaying substandard dissolved oxygen levels is below Benson Mill Pond, therefore it may
not fully reflect the affects of the discharge upon this waterbody. Both this SOC and the new permit
recommend downstream monitoring be taken prior to the mill pond.
Recommendations
At this time the IAU does not have an adequate tool to assess oxygen consuming wasteflow on a swamp
system. Therefore, if the SOC for additional flow is granted, the IAU would like to recommend additional
instream monitoring during the summer months. Since further impacts to Soules Swamp are likely to
occur during the SOC, expediting this order and achieving full compliance with permit limits is necessary.
Conversations with the Wilmington Regional Office indicates that the facility can consistently meet a BOD5
limit of 25 mg/1 monthly average, (37.5 mg/1 weekly average), therefore the IAU would recommend this
be changed as the SOC limit.
Finally, the instream monitoring for this facility is the only mechanism currently available to assess the
impact of this discharge. As noted, documented instream dissolved oxygen levels below 2.0 mg/1 exist for
both the upstream and downstream sites. The current downstream monitoring location is at SR 1429
which is a road crossing on Soules Swamp below Benson Mill Pond. The discharge from Chadbourn will
most likely have its most dramatic impact on the receiving waters above this mill pond, yet no instream
data is currently available from that location. Because of both the documented low dissolved oxygen
levels instream and the relaxed BOD5 limit coupled with an increase in discharge, more rigorous instream
monitoring is required to fully assess the impact of this discharge on these receiving waters. Therefore,
the IAU recommends the following instream monitoring locations and frequencies:
Upstream: SR 1005
Downstream (1): at least 1,000 feet below the discharge and above Benson Mill Pond in the main channel
Downstream (2): SR 1429
Parameters: Dissolved Oxygen and Temperature
Three times per week during June, July, August, and September and once per week
during the remaining months of the year.
cc: Don Safrit, Asst. Chief Technical Support
Dennis Ramsey, Asst. Chief Operations Branch
Dave Goodrich, Permits & Engineering Unit
Wilmington Regional Office
Central Files

DIVISION OF WATER QUALITY
Wilmington Regional Office
July 2, 1997
MEMORANDUM
TO: Farrell Keough
FROM: Rick Shiver, P.G. 55
SUBJECT: Change in SOC
Special Order By Consent SOC EMC WQ No. 90-30 AdIII
Town of Chadbourn
NPDES Permit No. NC0021865
Columbus County
Attached please find a copy of the changes made in SOC EMC WQ No.
90-30 AdIII prepared by Russ Colby.
The sample locations for both summer and winter monitoring
requirements for Total Residual Chlorine has been changed from
Effluent, Upstream, and Downstream to Effluent only as per the new
NPDES permit. A change has also been made to the flow data on the
in -stream assessment request; Background Data B(1) and (3).
If you have any question please contact Russ Colby [phone]
ext. 219.
RSS:GRC S\WQS\SOC\NC21865.MEM

BOD, 5 dav, 20°C**
EMC SOC WQ 90-30 MIDI
Attachment A
Town of Chadbourn
NPDES Permit Number NC0021865
Columbus County
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - SUMMER (April 1- October 31)
During the period beginning on the effective date of this Special Order and lasting until December 1, 1999, the
Permittee is authorized to discharge from outfall serial number 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
Effluent Characteristics Discharge Limitations
Units as Specified
Monthly Average Weekly Avg.
Flow 0.820 MGD
Amiar .g., 3� • 5 �,�
Total Suspended Residue** 30.0 mg/I 45.0 mg/1
NH3 as N 2.0 mg/1
Dissolved Oxygen* * *
Fecal Coliform 200.0/100 ml 400.0/100 ml
(geometric mean)
Total Residual Chlorine
Temperature, °C
Total Phosphorus
Total Nitrogen (NO2 + NO3 + TKN)
Chronic Toxici
* Sample LA - .tion: I -Influent, E Effluent, U-Upstream at least 100 feet above discharge point, D-Downstream
at leas : i "feet below discharge and above Benson Mill Pond. Upstream and downstream 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 TSS concentrations shall not exceed 15% of the respective influent
value (85% removal).
* * * The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/l.
* * * * Chronic (Ceriodaphnia) P/F at 84%; March, June, September, December; See Supplement to Effluent
Limitations and Monitoring Requirements - Special Conditions page.
The pH shall not be 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 be no discharge of floating solids or visible foam in other than trace amounts.
The Permittee may also be required to monitor for other parameters as deemed necessary by the Director in
future permits or Administrative Letters.
Note: Parameters underlined and noted in bold Lettering above are the only parameters modified as part
of this Special Order by Consent (SOC).
Monitoring Requirements
Measurement
Frequency
Continuous
3/Week
3/Week
3/Week
3/Week
3/Week
Sample *Sample
Type Location
Recording I or E
Composite I,E
Composite I,E
Composite E
Grab E,U,D
Grab E,U,D
3/Week
Daily
Quarterly
Quarterly
Quarterly
Grab E
Grab E,U,D
Composite E
Composite E
Composite E

EMC SOC WQ 90-30 AdIII
Attachment A
Town of Chadbourn
NPDES Permit Number NC0021865
Columbus County
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - SUMMER (April 1- October 31)
During the period beginning on the effective date of this Special Order and lasting until December 1, 1999, the
Permittee is authorized to discharge from outfall serial number 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
Effluent Characteristics
Conductivity
Cadmium
Nickel
Lead
Copper
Zinc
Discharge Limitations
Units as Specified Measurement
Monthly Avg. Daily Max Frequency
2.4 jcg/1
105.0 Ag/1 ,
30.0 Ag11
3/Week
Weekly
Weekly
Weekly
2/Month
2/Month
Monitoring Requirements
Sample *Sample
Type Location
Grab E,U,D
Composite E
Composite E
Composite E
Composite E
Composite E
* Sample Location: I -Influent, E Efuuent, U Upstream at least 100 feet above discharge point, D Downstream
at least 300 feet below discharge and above Benson Mill Pond. Upstream and downstream 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 Permittee may also be required to monitor for other parameters as deemed necessary by the Director in
future permits or Administrative Letters.
Note: Parameters underlined and noted in bold lettering above are the only parameters modified as part
of this Special Order by Consent (SOC).

EMC SOC WQ 90-30 AdIII
Attachment B
Town of Chadbourn
NPDES Permit Number NC0021865
Columbus County
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - WINTER (November 1- March 31)
During the period beginning on the effective date of this Special Order and lasting until December 1, 1999, the
Permittee is authorized to discharge from outfall serial number 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
Effluent Characteristics
Discharge Limitations Monitoring Requirements
Units as Specified
Monthly Avg. Weekly Avg.
Flow 0.820 MGD
BOD, 5 day, 20°C** 30.0 mg/1 45.0 mg/1
Total Suspended Residue** 30.0 mg/1 45.0 mg/1
NH3 as N 4.0 mg/1
Dissolved Oxygen* * *
Fecal Coliform 200.0/100 ml 400.0/100 ml
(geometric mean)
Total Residual Chlorine
Temperature, °C
Total Phosphorus
Total Nitrogen (NO2 + NO3 + TKN)
Chronic Toxicity* * * *
Measurement
Frequency
Continuous
3/Week
3/Week
3/Week
3/Week
3/Week
3/Week
Daily
Quarterly
Quarterly
Quarterly
Sample *Sample
Type Location
Recording I or E
Composite I
Composite I,E
Composite E
Grab E,U,D
Grab E,U,D
Grab E
Grab E,U,D
Composite E
Composite E
Composite E
* Sample Location: I -Influent, E-Effluent, U-Upstream at least 100 feet above discharge point, D-Downstream
at least 300 feet below discharge and above Benson Mill Pond. Upstream and downstream 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 TSS concentrations shall not exceed 15% of the respective influent
value (85% removal).
* * * The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/l.
* * * * Chronic (Ceriodaphnia) P/F at 84%; March, June, September, December; See Supplement to Effluent
Limitations and Monitoring Requirements - Special Conditions page.
The pH shall not be 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 be no discharge of floating solids or visible foam in other than trace amounts.
The Permittee may also be required to monitor for other parameters as deemed necessary by the Director in
future permits or Administrative Letters.
Note: Parameters underlined and noted in bold lettering above are the only parameters modified as part
of this Special Order by Consent (SOC).

EMC SOC WQ 90-30 AdIII
Attachment B
Town of Chadbourn
NPDES Permit Number NC0021865
Columbus County
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - WINTER (November 1- March 31)
During the period beginning on the effective date of this Special Order and lasting until December 1, 1999, the
Permittee is authorized to discharge from outfall serial number 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
Effluent Characteristics Discharge Limitations Monitoring Requirements
Units as Specified Measurement Sample *Sample
Monthly Average Daily Max Frequency Type Location
Conductivity 3/Week Grab E,U,D
Cadmium 2.4 ,ug/1 Weekly Composite E
Nickel 105.0 icg/1 Weekly Composite E
Lead 30.0 /2g/1 Weekly Composite E
Copper 2/Month Composite E
Zinc 2/Month Composite E
* Sample Location: I -Influent, E-Effluent, U Upstream at least 100 feet above discharge point, D-Downstream
at least 300 feet below discharge and above Benson Mill Pond. Upstream and downstream 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 Permittee may also be required to monitor for other parameters as deemed necessary by the Director in
future permits or Administrative Letters.
Note: Parameters underlined and noted in bold Lettering above are the o_ Lly parameters modified as part
of this Special Order by Consent (SOC).

Request Form for In -stream Assessment for 67(b) Analysis
NAME OF FACILITY _Town of Chadbourn PERMIT #NC0021865
COUNTY _Columbus REGION WiRO PERMITTED DESIGN FLOW 0.5 MGD
RECEIVING STREAM _Soules Swamp "C - Swamp" SUBBASIN 030758
REGIONAL CONTACT Russ Colby
BACKGROUND DATA:
A. Why is SOC needed? (Facility is out of compliance with which effluent limits?)
Noncompliance with Flow, BODS.
If out of compliance with Flow limit, is it due to inflow/infiltration? Yes
If I/I is a problem, then how much of the additional flow requested is the I/I?
295,000 gpd out of a total of 320,000 gpd.
B. SOC Request:
1. Monthly Average Waste flow in the last year 0.7950 MGD
(Pre-SOC Flow)
Time period Averaged 4/96 through 2/97
2. Current SOC Flow request Flow: 0.025 MGD
(Flow added on during the Order)
3. Total plant flow (Post-SOC Flow) Flow: 0.8200 MGD
(total of 1. and 2. above)
4. Is this an accurate flow balance for plant? Why/why not? Yes
Are there any facilities that have recently gone offline? None known
NOTE: The SOC may not include an addition of Waste flow; therefore B. above may not apply
and the region should fill out all other parts of this form. In cases where the SOC involves
violations of oxygen consuming or toxic limits, an evaluation may be necessary to predict the
water quality standard violations instream.
C. Please attach DMR summary for past year. for all permitted parameters. If possible,
include reports from previous years if facility has been under SOC for more than a
year. OK

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DIVISION OF WATER QUALI
Wilmington Regional Offi
June 23, 1997
MEMORANDUM
TO: Ruth Swanek
FROM: Rick Shiver, P.G.
Id u55 90 (Lead cuitd
At 1 sotvileaAt la'
kCif It
eow 11) njO
C 4-4 i 5 rig-tI -k"u
SUBJECT: In -stream Assessment Request
Special Order By Consent SOC EMC WQ No. 90-30 AdiII
Town of Chadbourn
NPDES Permit No. NC0021865
Columbus County
Attached please find Request Form for In -stream Assessment along
with SOC EMC WQ No. 90-30 AdiII prepared by Russ Colby.
The amendment was requested by the Town due to difficulties in
securing funding for the project. The project will be funded by
Rural Development of USDA. Rural Development lacked sufficient
funds for this project during the 96-97 fiscal year. The Town has
submitted an acceptable revised schedule.
The SOC Flow limit has been increased to accommodate current flow
data. Most of the requested additional flow is Inflow and
Infiltration, except for 25,000 gpd the Town has requested.
The Town is currently trying to eliminate beaver dams in Soules
Swamp. It will be at least two months before this project will be
completed and flows in the stream will return to normal.
If you have any question please contact Russ Colby [phone]
ext. 219.
RSS:GRC S\WQS\SOC\NC21865.MEM

Request Form for In -stream Assessment for 67(b) Analysis
NAME OF FACILITY Town of Chadbourn PERMIT #NC0021865
COUNTY Columbus REGION WiRO PERMITTED DESIGN FLOW 0.5 MGD
RECEIVING STREAM _Soules Swamp "C - Swamp" SUBBASIN 030758
REGIONAL CONTACT _Russ Colby
BACKGROUND DATA:
A. Why is SOC needed? (Facility is out of compliance with which effluent limits?)
Noncompliance with Flow, BOD5.
If out of compliance with Flow limit, is it due to inflow/infiltration? Yes
If I/I is a problem, then how much of the additional flow requested is the I/I?
295,000 gpd out of a total of 320,000 gpd.
B. SOC Request:
0:49s
1. Monthly Average Waste flow in the last year 4.6305' MGD
(Pre-SOC Flow)
Time period Averaged 4/96 through
2. Current SOC Flow request Flow: 4.025
, (Flow added on during the Order)
2/97
MGD
0.8ZO
3. Total plant flow (Post-SOC Flow) Flow: Q 5 MGD
(total of 1. and 2. above)
4. Is this an accurate flow balance for plant? Why/why not? Yes
Are there any facilities that have recently gone offline? None known
NOTE: The SOC may not include an addition of Waste flow; therefore B. above may not apply
and the region should fill out all other parts of this form. In cases where the SOC involves
violations of oxygen consuming or toxic limits, an evaluation may be necessary to predict the
water quality standard violations instream.
C. Please attach DMR summary for past year for all permitted parameters. If possible,
include reports from previous years if facility has been under SOC for more than a
year. OK

D. Briefly explain measures taken during the Order which will enable the facility to be in
compliance with permit limits at the end of the Order. Order will require expansion of
treatment capability to 1 MGD and quarterly progress reports on I & I rehabilitation.
CURRENT SOC REQUEST:
A. Is request for domestic or industrial waste? If a combination, please specify
percentages. Domestic only.
B. If industrial flow, then what type of industry? Please attach pertinent data. N/A
C. The region proposes the following SOC limits (all limits NOT listed here will remain
as in the current permit):
Conventional Parameters
Flow 1. 0.820 MGD
B OD 5 3 0/45 mg/1
other parameters
D. What is the basis for these limits? Average of highest levels over last year of reported
data.

GKEX88/MP
COMPLIANCE EVALUATION ANALYSIS REPORT
06/23/97
PAGE 1
PERMIT--NC0021865 PIPE--001 REPORT PERIOD: 9604-9702 LOC---E
FACILITY--CHADBOURN, TOWN - WWTP DESIGN FLOW-- .5000 CLASS--3
LOCATION--CHADBOURN REGION/COUNTY--08 COLUMBUS
50050 00310 00530 00610 31616 50060 00300 TGP3B
MONTH Q/MGD BOD RES/TSS NH3+NH4- FEC COLI CHLORINE DO CERI7DPF
LIMIT S .6700 S 30.00 S 30.0 NOL S 1000.0 NOL S 6.00 NOL
96/04 .7159F 21.70 6.5 1.57 17.9 .216 8.37
96/05 .5228 7.05 1.5 .55 26.9 .215 8.30 1
96/06 .3412 12.05 4.2 .47 34.3 .235 8.17
96/07 .3953 23.00 9.6 .10 108.8 .261 8.34
96/08 .5932 14.50 14.6 1.55 284.6 .286 7.93
96/09 .8931F 3.55 8.0 .96 .0 .315 6.32F
96/10 .7745F 4.00 10.4 2.34 758.9 .417 6.44F
96/11 .5135 3.00 3.2 .35 9.8 .416 7.96
96/12 .6445 2.00 1.7 .12 30.8 .310 7.71
97/01 .7395E 1.75 9.5 .77 32.2 .314 6.93F
97/02 .8025F 1.80 4.5 .58 6.2 .260 7.58
AVERAGE .6305 8.58 6.7 .85 119.1 .295 7.64 1
MAXIMUM 1.5500!� 21.3 4.20 1200.0 .900 9.60 1
MINIMUM .1000 1.00 1.0 .10 LESSTHAN .100 1.10 1
UNIT MGD MG/L MG/L MG/L #/100ML MG/L MG/L PASS/FAI

GKEX88/MP
COMPLIANCE EVALUATION ANALYSIS REPORT
06/23/97
PAGE 2
PERM I T----NC0021865 PIPE---001 REPORT PERIOD: 9604-9702 LOC---E
FACILITY---CHADBOURN , TOWN - WWTP DESIGN FLOW-- .5000 CLASS--3
LOCATION--CHADBOURN REGION/COUNTY---08 COLUMBUS
00010 00095 00400 00600 00665 01027 01034 01042
MONTH TEMP CNDUCTVY PH TOTAL N PHOS-TOT CADMIUM CHROMIUM COPPER
LIMIT NOL NOL 9.0 6.0 NOL NOL NOL
96/04 16.61 8 .7--7 .4
96/05 21.22 8.2-7.1 7.900 .8000 .0000 .0080 .0000
96/06 23.90 8 .2--7 .7
96/07 25.72 8.6-7.6
96/08 25.59 8 .1--7 .1
96/09 24.00 8 .2--6 .9
96/10 21.39 8.1-7.2
96/11 16.50 8 .2--7 .5 .0100 .0200 .0100
96/12 14.10 8.2-7.0
97/01 13.33 8.2-7.0
97/02 13.02 8 .1--6 .9 .0000 .0000 .0000
AVERAGE 19.58 7.900 .8000 .0033 .0093 .0033
MAXIMUM 27.00 8.700 7.900 .8000 .0100 .0200 .0100
MINIMUM 11.00 6.900 7.900 .8000 .0100 .0080 .0100
UNIT DEG.0 UMHOS/CM SU MG/L MG/L MG/L MG/L MG/L

.i
GKEX88/MP
COMPLIANCE EVALUATION ANALYSIS REPORT
06/23/97
PAGE 3
PERMIT---NC0021865 PIPE--001 REPORT PERIOD: 9604-9702 LOC---E
FACILITY---CHADBOURN , TOWN - WWTP DESIGN FLOW-- .5000 CLASS--3
LOCATION--CHADBOURN REGION/COUNTY---08 COLUMBUS
MONTH
LIMIT
96/04
01051 01067 01092
LEAD NICKEL ZINC
NOL
96/05 .0000 .0000 .0000
96/06
96/07
96/08
96/09
96/10
96/11 .1000 .0500 .0130
96/12
97/01
97/02 .0000 .0240 .0000
3VERAGE .0333 .0246 .0043
IAXIMUM .1000 .0500 .0130
1INIMUM .1000 .0240 .0130
JNIT MG/L MG/L MG/L

SPECIAL ORDER bv. CONSENT (SOC)
REGIONAL OFFICE CHECKLIST
Wilmington Regional Office
Town of Chadbourn
NPDES Permit Number NC0021865
County of Columbus
EMC SOC WO 90-30 Ad III •
A. Why was this SOC requested? The Town is unable to meet its permit limit for flow and
BODS due to significant I & I. The amendment was requested because the Town could not
secure funding.
B. What type of facility is currently in operation? (trickling filter, activated sludge, etc:) Give
design flow and permitted flow. 0.500 MGD activated sludge plant.
C. State affected stream and current stream classification. Facility discharges to Soules
Swamp, classified as Class "C-Swamp", in the Lumber River Basin.
D. Discuss any and all downstream water quality impacts. Include the data summary if
possible. Discharge is into a low flow and low velocity swamp.
E. Was Instream assessmconducted? (Only for oxygen consuming parameters)
Circle one: YES
If yes send copy of report to Central Office.
If no, please explain? Instream assessment request is enclosed.
F. Attach most current MP screen. [Last twelve (12) months] Yes.
G. Is facility prope operated and maintained?
Circle one: NO
If no, why not? xplain.
What was the date of the last inspection completed? November 26, 1996
What were the results from that inspection? Compliance.
H. Discuss the applicants third party evaluation of current treatment capabilities. Has this
evaluation been reviewed by the Technical Assistance and Certification Group of the Water
Quality Section? What were their comments/suggestions? If the Technical Assistance
Training and Certification Group has not seen the evaluation please explain why.
The Town has not had any significant problems inthe past with permit compliance other
than the flow parameter and occasional BODS spikes.
I. How were the interim effluent parameter limitations established? The interim effluent
parameters were obtained by averaging the highest monthly values plus additional flow
requested during the term of the Order.
J. How were the schedule dates of the proposed Order established? The Town's consultant
provided a reasonable schedule which allows for the acquisition of funding.

K. Specifically identify what the facility will be doing/constructing during the term the Order
will be in effect (i.e., construction of a new clarifier; connection to an existing facility, etc.)
Construction of an additional clarifier, aeration basin, and aerobic digester; a new tertiary
filter, and a new chlorine contact basin with dechlonnation. The Town will also make
repairs to the collection system to reduce or eliminate I & I.
L. What is the up -front penalty amount of the SOC, and how was this amount determined?
No up -front penalty is recommended.
M. If no up -front penalty is being recommended, please indicate why. The Town has already
passed a bond referendum, and the Town's consultant has assured the Regional Office that
funding through Rural Development of USDA will be acquired for the next fiscal year.
N. If stipulated penalties are different from those mentioned in the standard SOC shells (67b
and WQ shells) indicate why they are different. N/A
O. Does this faciIi urrently monitor according to the most recent NPDES Permit or SOC?
Circle one: ) NO If no, please explain.
P. Does Toxicity need to • - relaxed as part of this Order?
Circle one: YES
If yes, please attach recommendations of the Aquatic Survey & Toxicology Unit.
Q. Does Pretreatment need to be addressed as part of the Order?
Circle one: YES NO
If yes, what are the recommendations of the Pretreatment Group.
R. Is the Permit under adj dication?
Circle one: YES O
If yes, what are the details of the pending case. Explain.
•
S. Include schedule for Construction Grant funding„if applicable. N/A
T. If SOC application is for a Town/City and new for the first time (i.e., no amendment), has a
Resolution been completed to secure required funding responsibilities? N/A
Circle one: YES NO
If no, please explain.
U. Have the SOC limitations pages (usually attachments A, B, C, etc.) been compared against
the most recen ' sued Permit or Permit currently at Public Notice?
Circle one: NO
If no, please exp ain.
V. If an SOC schedule date has been met, is the date indicated by (MET) after the date
specified for a articular event? N/A
Circle one: (...,S> NO
If no, please explain.
W. Have any modifications been made by the regional office to the SOC shell? If so, please
explain in full exactly what those changes are. Part 2(a) was deleted because no up -front
penalty is being assessed.
X. Has a spell the een run on the entire SOC document (including all attachment pages)?
Circle one: TE NO
If no, conduct a spell check before sending to the `Central Office.

b-
i•
Y. List y and all special circumstances concerning the issuance or denial of this SOC.
This amendment is being prepared due to the fact that the Town could not secure funding
under EMC SOC WQ 90-30 AdII. The Wilmington Regional Office has concerns about the
significant I&I problem. The Town should make all efforts to reduce or eliminate this
problem during and after the term of this Order. The Wilmington Office recommends this
amendment to the SOC.
Z. What is the re 'onal office recommendation on this Special Order by Consent?
Circle one: f ENTP✓R i • • RD DENIAL OF ORDER
Preparer's Signature: ,9'j Date: 6 / / b / 9 ?--
l
4
Water Quality Supervisor's signature: .0 c- IL_ S (,-Z i v' r-
Date: G — V-7 — 9,7

NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
COUNTY OF COLUMBUS
IN THE MATTER OF )
NORTH CAROLINA )
NPDES PERMIT )
NUMBER NC0021865 )
HELD BY THE TOWN )
OF CHADBOURN )
SPECIAL ORDER BY CONSENT
EMC SOC WQ 90-30 AdIlI
Pursuant to provisions of North Carolina General Statutes (G.S.) 143-215.2 and
143-215.67, this Special Order by Consent is entered into by the Town of Chadbourn, hereinafter
referred to as the Town, and the North Carolina Environmental Management Commission, an
agency of the State of North Carolina created by G.S. 143B-282, and hereinafter referred to as
the Commission:
1. The Town and the Commission hereby stipulate the following:
(a) The Town holds North Carolina NPDES Permit Number NC0021865 for operation of
an existing wastewater treatment works and for making an outlet therefrom for treated
wastewater to Soules Swamp, Class "C Swamp" waters of this State in the Lumber
River Basin, but is unable to consistently comply with final effluent limitations for Flow,
and BOD5, as set forth in NPDES Permit Number NC0021865. Compliance will require
preparation of plans and specifications for construction and operation of additional
treatment works.
(b) Noncompliance with final effluent limitations constitutes causing and contributing to
pollution of the waters of this State named above, and the Town is within the
Jurisdiction of the Commission as set forth in G.S. Chapter 143, Article 21.
•
(c) The Town desires to cause or allow the discharge of 0.025 MGD of additional
wastewater to the treatment works, and the discharge of such additional wastewater will
not result in any significant degradation to the quality of any waters.
(d) The Town will secure financing for planning, design and construction of an improved
waste disposal system which, once constructed and operated, will be sufficient to
adequately treat wastewater presently being discharged and the additional wastewater
desired to be discharged, to the extent that the Town will be able to comply with final
effluent permit limitations.
(e) Since this Special Order is by Consent, neither party will file a petition for a contested
case or for judicial review concerning its terms.
2. The Town desiring to comply with the Permit identified in paragraph 1(a) above' hereby
agrees to do the following:
(a) Provide the Wilmington Regional Office of the North Carolina Division of Water
Quality (DWQ), located at 127 Cardinal Drive Extension, Wilmington, N.C. 28405,
with a list of all additions of flow under the Town's Special Order by Consent, and
update this list each time flow is added to the system.

(b)
Undertake the following activities in accordance with the indicated time schedule:
1) Submit complete plans and specifications for repairs to existing facilities and/or
construction of replacement sewers which will when completed remove excessive
infiltration and inflow from the Town's sewer collection system on or before
September 30, 1991; (Met)
2) Complete repairs and/or replacement sewers on or before September 30. 1992;
(Met)
3) Complete storm drainage improvements within the Town and eliminate the cross
connections with the sanitary sewer system so as to reduce inflow on or before
October 31. 1994; (Met)
4) Retest sewer collection system to determine effectiveness of infiltration and inflow
removal on or before March 31, 1995; (Met)
5) Determine the actual capacity necessary for the Town's wastewater treatment
plant on or before May 31, 1995; (Met)
6) If the existing facilities are determined to have adequate capacity to serve the
Town's needs; the Town will request termination of this Order on or before
May 31, 1995;
7) Select adequate effluent disposal location and receive a wasteload allocation on or
before October 31, 1995; (Met)
8) Submit complete plans and specifications for improvements to the existing
wastewater treatment facility on or before December 31, 1996; (Met)
9) Submit a progress report addressing steps made towards the replacement and/or
rehabilitation of sewer lines to reduce or eliminate inflow and infiltration by
October 1. 1997 and Quarterly thereafter during the term of this Order .
10) Obtain funding needed for the construction of facilities to upgrade the existing
wastewater treatment facility on or before December 1, 1997.
11) Award contracts for the construction of facilities to upgrade the existing
wastewater treatment facility on or before March 1, 1998.
12) Complete construction of facilities to upgrade the Town's wastewater treatment
facility on or before July 1, 1999.
13) Comply with the final effluent limitations contained in NPDES Permit No.
NC0021865 on or before September 1. 1999.
(c) The Town shall comply with all terms and conditions of the permit except those effluent
limitations identified in paragraph 1(a) above. See Attachments A, B, and C for all
monitoring requirements and effluent limitations. The Permittee may also be required to
monitor for other parameters as deemed necessary by the Director in future permits or
administrative letters.

(d) During the time in which this Special Order by Consent is effective, the Town shall
comply with effluent limitations as contained in Attachments A, B and C.
Under this Special Order by Consent, ONLY the parameters listed below have been
modified from the most current NPDES Permit currently in effect.
Pipe Number 001
Permit Limitations Modified Limitations (SOC)
Parameters Unit Monthly Avg. Weekly Avg., Monthly Avg., Weems Avg_
•
Flow MGD 0.50 0.82
BODS mg/1 5.0/6.0 7.5 • 30 45
(e) No later than fourteen (14) calendar days after any date identified for accomplishment of
any activity listed in 2(b) above. submit to the Director of DWO written notice of
compliance or noncompliance therewith. In the case of noncompliance, the notice shall
include a statement of the reason(s) for noncompliance, remedial action(s) taken. and a
statement identifying the extent to which subsequent dates or times for accomplishment
of listed activities may be affected.
Enforce the North Carolina State Building Code as it applies to Water Conservation
(Volume II Plumbing, Chapter 9, 901 General Requirements -Materials, 901.2 Water
Conservation, and Table 901.2.2-Maximum Allowable Water Usage For Plumbing
Fixtures). .
Develop and adopt sewer use ordinance limitations for non -conventional pollutants.
Implement the pretreatment program as approved by the Director, including the
enforcement of both categorical pretreatment standards and local limits.
Identify any infiltration and inflow problems associated with the facility and establish a
program to correct.
(f)
(g)
01)
(i)
Use forty percent (40%) of the revenue received by a municipality from additional one-
half percent (1/2%) sales and use taxes levied during the first five (5) fiscal years in
which the additional taxes are in effect in the municipality and thirty percent (30%) of
the revenue received by a municipality from these taxes in the second five (5) fiscal years
in which the taxes are in effect in the municipality for water and sewer capital outlay
purposes or to retire any indebtedness incurred by the municipality for these purposes.
3. The Town agrees that unless excused under paragraph four (4), the Town will pay the
Director ofDWQ, by check payable to the North Carolina Department of Environment,
Health and Natural Resources, stipulated penalties according to the following schedule for
failure to meet deadlines set out in paragraphs 2(b) and 2(e), or failure to attain compliance
with the effluent limitations/monitoring requirements contained in Attachments A, B, and C.
Failure to meet a schedule date $100/day for the first 7
days; $500/day
thereafter
Failure to maintain compliance with $1000/violation
any modified limit contained in the SOC.

Failure to achieve compliance with final $1820.00
effluent limitations at final compliance deadline
Monitoring frequency violations
Monitoring frequency violations
(for Toxicity)
Failure to submit progress reports
$100 per omitted value
per parameter
$1,000 per omitted value
per parameter
$50/day for the first seven (7)
days; $250/day thereafter
4. The Town and the Commission agree stipulated penalties are not due if the Town satisfies the
Division of Water Quality noncompliance was caused solely by:
a. An act of God;
b. An act of war;
c. An intentional act or omission of a third party, but this defense shall not be available if
the act or omission is that of an employee or agent of the defendant or if the act or
omission occurs in connection with a contractual relationship with the Permittee;
d. An extraordinary event beyond the Pennittee's control. Contractor delays or failure to
obtain funding will not be considered as events beyond the Pennittee's control; or
e. Any combination of the above causes.
Failure within thirty (30) days of receipt of written demand to pay the penalties, or challenge
them by a contested case petition pursuant to G.S. 150B-23, will be grounds for a collection
action, which the Attorney General is hereby authorized to iitiate. The only issue in such an
action will be whether the thirty (30) days has elapsed.
5. In accordance with provisions of G.S. 143-215.67(b) the Commission allows the Town to
accept the additional waste specified below to its waste disposal system:
0.025 MGD of additional wastewater. The nature of the additional flows is such that the
waste characteristics do not exceed those generally associated with domestic waste or are
pretreated to domestic strengths. Waste of greater than normal domestic strength may be
accepted if the parameter(s) that exceed normal domestic strength wastewater are not those
for which interim limitations have been developed and it can be demonstrated to the
satisfaction of the Director the additional waste will not adversely affect the treatment
efficiency of the treatment system for any modified parameter or result in the violation of any
other permit limitation. All new and proposed industrial waste tributary to the system must be
controlled using all needed mechanisms including but not limited to adoption and
implementation of industrial waste control and pretreatment ordinances. No wastewater can
be accepted which will add toxic pollutants in quantities not generally associated with
domestic wastewater characteristics, unless the acceptance of the additional wastewater can
be supported through appropriate analyses acceptable to the Director.

6. This Special Order by Consent and any terms, conditions and interim effluent limitations
contained herein, hereby supersede any and all previous Special Orders, Enforcement
Compliance Schedule Letters, terms, conditions,, and limitations contained therein issued in
connection with NPDES Permit No. NC0021865. In the event of an NPDES Permit
modification or renewal, any effluent limitations or monitoring requirements contained therein
shall supersede those contained in Attachment A, B, and C of this Special Order by Consent,
except as modified and contained in paragraph 2.(d) above.
7. Any Violation of terms of this Special Order by Consent. including paragraphs 2(b) and 2(e)
above and Attachments A, B. and C shall terminate paragraph five (5) of this Order and any
authorized additional waste not previously connected to the system shall not thereafter be
connected until the necessary sewerage system improvements have been completed and placed
in operation.
8. Noncompliance with the terms of this Special Order by Consent are subject to enforcement
action in addition to the above stipulated penalties, including injunctive relief pursuant to G.S.
143-215.6.(C).
9. The Permittee. upon signature of this Special Order by Consent. will be expected to comply
with all schedule dates. terms, and conditions of this document.
10. This Special Order by Consent shall expire December 1,1999.
For the Town of Chadbourn:
Print Name and Title of Signing Official
Signature.of Signing Official
Date
For the North Carolina Environmental Management Commission:
Chairman of the Commission
Date

EMC SOC WQ 90-30 AdDI
Attachment A
Town of Chadbourn
NPDES Permit Number NC0021865
Columbus County
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - SUMMER (April 1- October 31)
During the period beginning on the effective date of this Special Order and lasting until December 1. 1999, the
Permittee is authorized to discharge from outfall serial number 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
Effluent Characteristics Discharge Limitations Monitoring Requirements
Flow
BOD, 5 day, 20°C**
Total Suspended Residue**
NH3 as N
Dissolved Oxygen* * *
Fecal Coliform
(geometric mean)
Total Residual Chlorine
Temperature, °C
Total Phosphorus
Total Nitrogen (NO2 + NO3 + TKN)
Chronic Toxicity* * * *
Units as Specified
Monthly Average Weekly Avg.
0.820 MGD
30.0 ma/I 45.0 m2/I
30.0 mg/1 45.0 mg/I
2.0 mg/1
200.0/100 ml 400.0/100 ml
Measurement
Frequency
Continuous
3/Week
3/Week
3/Week
3/Week
3/Week
3/Week
Daily
Quarterly
Quarterly
Quarterly
Sample
Type
Recording
Composite
Composite
Composite
Grab
Grab
Grab
Grab
Composite
Composite
Composite
*Sample
Location
I or E
I,E
I,E
E
E,U,D
E,U,D
fee. Russet)
cot (r+
E, ,
E,U,D
E
E
E
* Sample Location: I -Influent, E-Effluent, U-Upstream at least 100 feet above discharge point, D-Downstream
at least 300 feet below discharge point. Upstream and downstream 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 TSS concentrations shall not exceed 15% of the respective influent
value (85% removal).
* * * The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/I.
**** Chronic (Ceriodaphnia) P/F at 84%; March, June, September, December; See Supplement to Effluent
Limitations and Monitoring Requirements - Special Conditions page.
The pH shall not be 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 be no discharge of floating solids or visible foam in other than trace amounts.
The Permittee may also be required to monitor for other parameters as deemed necessary by the Director in
future permits or Administrative Letters.
Note: Parameters underlined and noted in bold lettering above are the ony parameters modified as part
of this Special Order by Consent (SOC).

a
EMC SOC WQ 90-30 AdIII
Attachment A
Town of Chadbourn
NPDES Permit Number. NC0021865
Columbus. County
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - SUMMER (April 1- October 31)
During the period beginning on the effective date of this Special Order and lasting until December 1. 1999, the
Permittee is authorized to discharge from outfall serial number 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
Effluent Characteristics
Conductivity
Cadmium
Nickel
Lead
Copper
Zinc
Discharge Limitations
Measurement
Monthly Avg. Daily Max Frequency
Units as Specified
•
2.4 Ag/1
105.0 /41
30.0 ucg/1
3/Week
Weekly
Weekly
Weekly
2/Month
2/Month
Monitoring Requirements
Sample *Sample
Type Location
Grab E,U,D
Composite E
Composite E
Composite E
Composite E
Composite E
* Sample Location: I -Influent, E-Effluent, U-Upstream at least 100 feet above discharge point, D Downstream
at least 300 feet below discharge point. Upstream and downstream 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 Permittee may also be required to monitor for other parameters as deemed necessary by the Director in
future permits or Administrative Letters.
Note: Parameters underlined and noted in bold Lettering above are the only parameters modified as part
of this Special Order by Consent (SOC).

Flow
BOD, 5 day. 20°C**
Total Suspended Residue**
NH3 as N
Dissolved Oxygen* * *
Fecal Coliform
(geometric mean)
Total Residual Chlorine
Temperature, °C
Total Phosphorus
Total Nitrogen (NO2 + NO3 + TKN)
Chronic Toxicity* * * *
EMCSOC WQ90-30AWE
Attachment B
Town of Chadbourn
NPDES Permit Number NC0021865
Columbus County
•
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - WINTER (November 1- March 31)
During the period beginning on the effective date of this Special Order and lasting until December 1, 1999, the
Permittee is authorized to discharge from outfall serial number 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
Effluent Characteristics Discharge Limitations Monitoring Requirements
Units as Specified Measurement
Monthly Avg. Weekly Avg. Frequency
0.820 MGD Continuous
30.0 m2/1 45.0 ma/1 3/Week
30.0 mg/1 45.0 mg/1 3/Week
4.0 mg/1 3/Week
3/Week
200.0/100 ml 400.0/100 ml 3/Week
3/Week
Daily
Quarterly
Quarterly
Quarterly
Sample
Type
Grab
Grab
Composite E
Composite E
Composite E
*Sample
Location
Recording I or E
Composite I,E
Composite I,E
Composite E
Grab E,U,D
Grab E,U,D
pm- 2c5sc 11
co(bif t�'1
E,U,D
E,U,D
* Sample Location: I -Influent, E-Effluent, U-Upstream at least 100 feet above discharge point, D-Downstream
at least 300 feet below discharge point. Upstream and downstream 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 BOD5 and TSS concentrations shall not exceed 15% of the respective influent
value (85% removal).
*** The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/1.
* * * * Chronic (Ceriodaphnia) P/F at 84%; March, June, September, December; See Supplement to Effluent
Limitations and Monitoring Requirements - Special Conditions page.
The pH shall not be 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 be no discharge of floating solids or visible foam in other than trace amounts.
The Permittee may also be required to monitor for other parameters as deemed necessary by the Director in
future permits or Administrative Letters.
Note: Parameters underlined and noted in bold lettering above are the only parameters modified as part
of this Special Order by Consent (SOC).

EMC SOC WQ 90-30 Adf
Attachment B
Town of Chadbourn
NPDES Permit Number NC0021865
Columbus County
•
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - WINTER (November 1- March 31)
During the period beginning on the effective date of this Special Order and lasting until December 1, 1999, the
Permittee is authorized to discharge from outfall serial number 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
Effluent Characteristics
Conductivity
Cadmium
Nickel
Lead
Copper
Zinc
Discharge Limitations
Measurement
Monthly Average Daily Max Frequency
Units as Specified
2.41ug/1
105.0 ,ug/1
30.0 Ag/1
3/Week
Weekly
Weekly
Weekly
2/Month
2/Month
Monitoring Requirements
Sample *Sample
Type Location
Grab E,U,D
Composite E
Composite E
Composite E
Composite E
Composite E
•
* Sample Location: I Influent, E-Effluent, U Upstream at least 100 feet above discharge point, D-Downstream
at least 300 feet below discharge point. Upstream and downstream 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 Permittee may also be required to monitor for other parameters as deemed necessary by the Director in
future permits or Administrative Letters.
Note: Parameters underlined and noted in bold Lettering above are the oh parameters modified as part
of this Special Order by Consent (SOC).

EMC SOC WQ 90-30- AdIU
Attachment C
Town of Chadbourn
NPDES Permit No. NC0021865
Columbus 'County
CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
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 84.0% (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 March, June, September, and December. Effluent sampling for this
testing shall be performed at the NPDES permitted final 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 form 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.