NC0021865_Permit (Modification)_19970628

- 97
State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
July 30, 1997
Mayor Paul B. Avant
Town of Chadbourn
208 E. First Avenue
Chadboum, North Carolina 28431
Dear Mr. Avant:
si.
113 F=l
Subject: NPDES Permit Modification
Permit No. NC0021865
Town of Chadbourn WWTP
Columbus County
On July 29, 1997, the Division of Water Quality received a modified rating sheet and a request to modify NPDES
Permit No. NC0021865, the Town of Chadbourn Waste Water Treatment Plant. Accordingly, we are forwarding
herewith the modification to the subject permit. This permit modification is to the 0.50 MGD effluent limitations
pages. The monitoring frequencies have been changed from a Class III facility to a Class II facility due to the polymer
feed system being disconnected.
Please find enclosed the amended limitations pages which should be inserted into your permit. The old pages should
be discarded. All other terms and conditions contained in the original permit remain unchanged and in full effect. This
permit modification is issued pursuant to the requirements of North Carolina General Statutes 143-215.1 and the
Memorandum of Agreement between North Carolina and the U. S. Environmental Protection Agency.
If any parts, measurement frequencies or sampling requirements contained in this permit modification are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty (30) days
following receipt of this letter. This request must be in the form of a written petition, conforming to Chapter 150B of
the North Carolina General Statutes, and filed with the Office of Administrative Hearings, Post Office Drawer 27447,
Raleigh, North Carolina 27611-7447. Unless such demand is made, this decision shall be final and binding.
If you have any questions concerning these permit modifications, please contact Mary Cabe at telephone number
[phone], extension 518.
cc. Central Files
Wilmington Regional Office
Permits and Engineering Unit
Facility Assessment Unit
Aquatic Survey and Toxicology Unit
Compliance Group
Sincerely,
A. Preston Howard, Jr., P.E.
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

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0021865
During the period beginning on the effective date of the permit and lasting until expansion above 0.50 MGD, the Pennittee is authorized to
discharge from outfall serial number 001. Such discharges shall be limited and monitored by the permittee as specified below:
Effluent Characteristics
Flow
BOD, 5 Day, 20 °C"(Apr.1-Oct.31)
BOD, 5 Day. 20 °C"(Nov.1-Mar.31)
Total Suspended Residue"
Dissolved Oxygen "'
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature, °C
Temperature. °C
Total Phosphorus
Chronic Toxicity'—•
* Sample locations: E - Effluent, I - Influent, U - Upstream at least 100' (SR 1005), D -
above Benson Mill Pond.
** The monthly average effluent BOD5 and Total Suspended Residue 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, and December. Special permit conditions applicable to the subject
facility are listed on the 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 weekly at the effluent by grab
sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Discharge Limitations
Weekly Avg.
Daily Max
Monthly Avg.
0.50 MGD
5.0 mg/I
6.0 mg/I
30.0 mg/I
200.0 /100 ml
7.5 mg/I
7.5 mg/I
45.0 mg/I
400.0 /100 ml
Monitoring Requirements
Measurement Sample •Sample
Frequency Type Location
Continuous Recording I or E
Weekly Composite E,
Weekly Composite E, I
Weekly Composite E, I
Weekly Grab E, U, D
Weekly Grab E, U, D
2/Week Grab E
Daily Grab E
Weekly Grab U. D
Quarterly Composite E
Quarterly Composite E
Downstream at least 3(XY below the discharge and

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0021865
During the period beginning on the effective date of the permit and lasting until expansion above 0.50 MGD, the Permittee is authorized to
discharge from outfall serial number 001. (Continued)
Effluent Characteristics
Conductivity
NH3 as N (Apr.1-Oct.31)
NH3 as N (Nov.1-Mar.31)
Cadmium
Nickel
Lead
Copper
Zinc
Total Nitrogen (NO2+NO3+TKN)
Discharge Limitations
Units (specify)
Monthly Avg. Weekly Avg.
2.0 mg/I
4.0 mg/I
Daily Max
2.4 µg/I
105.0 µg/I
30.0 µg/I
Monitoring Requirements
Measurement Sample *Sample
Frequency Type Location
Weekly Grab E, U, D
Weekly Composite E
Weekly Composite E
Weekly Composite E
Weekly Composite E
Weekly Composite E
2/Month Composite E
2/Month Composite E
Quarterly Composite E

PART I
SOC PRIORITY PROJECT: YES
SOC EMC WQ 90-30 AdI
To: Permits and Engineering Unit
Water Quality Section
Attention: Mary Cabe
Date: 3/26/97
NPDES STAFF REPORT AND RECOMMENDATION
County: Columbus
Permit No. NC0021865
- GENERAL INFORMATION
1. Facility and Address: Town of Chadbourn
208 East First Street
Chadbourn, NC 28431
2. Date of Investigation: Not done
3. Report Prepared by: Steve West
4. Persons Contacted and Telephone Number:
Tracy Fore, ORC [phone]
5. Directions to Site: Travel west on NC Hwy 130 towards
Chadbourn. Dirt access road is on the left approximately a
quarter mile before the intersection with SR 1005.
6.
Discharge
Latitude:
USGS Quad
Point:
34° 19' 34"
No: J 23 NE
Longitude:
78° 47' 48"
USGS Quad Name: Chadbourn, NC
7. Site size and expansion area consistent with application?
N/A
8. Topography: The facility site is relatively flat and
approximately 85 feet above msl.
9. Location of nearest dwelling: Approximately 0.25 miles.
10. Receiving
a.
b.
c.
stream or affected surface waters: Soules Swamp
Classification: Class "C-Swamp" waters
River Basin and Subbasin No.: 030758
Describe receiving stream features and pertinent
downstream uses: Low flow and low velocity stream.

r
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater to be permitted: 1.0 MGD
b. What is the current permitted flow limit? 0.5 MGD
c. Actual treatment capacity of the current facility:
Approximately 0.5 MGD
d. Date and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years: None
e. Please provide a description of existing wastewater
treatment facilities: The facility consists of an
influent bar screen, influent Parshall flume with a
continuous recording flow meter, aeration basin with
three low speed mechanical aerators, clarifier with
return sludge, dual polishing ponds, dual chlorine
contact chambers with gaseous chlorine addition, an
aerated sludge digester, and emergency back-up drying
beds.
f. Please provide a description of proposed wastewater
treatment facilities: The expanded facilities will
consist of a grit removal system, expanded aeration,
clarification and sludge digestion, tertiary filters,
chlorination, dechlorination and post -aeration.
g. Possible toxic impacts to surface waters: Chlorine is a
potential problem but dechlorination is planned for the
upgrade.
h. Pretreatment Program: Not needed at this time.
2. Residuals handling and utilization/disposal scheme:
The facility holds Permit No. WQ0001934 for the land
application of residuals.
3. Treatment plant classification : Class III facility
4. SIC Code: 4952
Wastewater Code. Primary: 01 Secondary: N/A
Main Treatment Unit Code: 055X3