NC0040061_Fact Sheet_20240715

NCDEQ / DWR / NPDES
EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL
NPDES Permit NCO040061
Sara Bassett / Compliance & Expedited Permitting Unit / sara.bassett(kdeq.nc.gov / June 2024
FACILITY INFORMATION
Facility Contact/Facility Name
Jeremy Sexton, Beaverdam Creek WTP
Brunswick County Public Utilities Department
Mailing Address
PO Box 249 Bolivia NC 28422
Facility Physical Address
4305 Southport -Supply Hwy SE Southport NC 28461
Max, Monthly Avg Flow (MGD)
No discharge in last 10 years
Type of Waste
Filtered potable water and filter backwash
Facility Class
PC-1
County
Brunswick
Permit Status
Renewal
Regional Office
WiRO
STREAM CHARACTERISTICS
Receiving Stream
Beaverdam Creek
Stream
Classification
SC; Sw: HQW
Stream Segment
18-88-9-1-(0.5)
LOongall 001 Lat
33°57'34.9"N 78°04'59.9"W
7Q10 -Summer (cfs)
Tidal
Outfall 002 Lat
Long
33°57'33.1 "N 78°04'59.2"W
7Q 10 - Winter (cfs)
Tidal
Drainage basin
Cape Fear
30Q2 (cfs)
Tidal
Subbasin
03-06-17
Average Flow (cfs)
Tidal
HUC
030300050802
IWC (%)
100%
303(d) List
Yes- Prohibited Shellfish
Growing Area Status (Fecal,
SH, SA
NOTES
From application:
Since the issuance of the last permit, we have constructed 2 new solids settling lagoons as well as an
upgraded supernatant pumping station. All supernatant is either recycled to the head of the plant or
discharged to the sanitary sewer. The outfall for the lime settling part of the plant operation has been
removed (old outfall 001). Old Outfalls 002 and 003 are the drains on the potable water storage tanks. They
still exist and have been renamed Outfall 001 and 002 for this permit period. These tanks do not contain
chemical disinfection and are pH adjusted to 7.2. Discharge from the outfalls is very rare. There has been
no discharge from any of the Outfalls in over 10 years.
FACILITY SUMMARY
This facility is a conventional technology water treatment plant [coagulation, flocculation, sedimentation,
and filtration] with discharge of wastewaters from media filter backwash and sedimentation basins with a
design potable flowrate of 6.0 and a backwash maximum monthly average discharge of 0.150 MGD with
wastewater treatment consisting of,
• five (5) solid settling lagoons
• three (3) sludge -drying beds
Fact Sheet for Permit Renewal
June 2024 - NPDES Permit NCO040061 - Page 1

RENEWAL SUMMARY
This renewal contains the following changes:
• Acute Toxicity testing requirements in Section A. (L) and A. (2.) have been updated from
monitoring to a pass/fail limit per the Division's 2020 strategy.
• Outfall 1 has been removed from the permit.
• Section A. (5.) has been updated regarding electronic submission of effluent data. Federal
regulations require electronic submittal of all discharge monitoring reports (DMRs).
• The wastewater treatment components at the facility have been corrected on the Supplement to
Permit Cover Sheet to reflect only those which are used to treat wastewater. Any drinking water
treatment components have been removed.
• The parameter of iron has been removed from Section A. (L).
• The parameter of hardness has been removed from Section A. (1.).
• A monthly average flow limit has been added to section A. (1.).
Iron was removed following the Division's 2020 WTP Strategy as there are currently no water quality
standards for this parameter in North Carolina.
Hardness monitoring has been removed in alignment with the Division's 2024 Hardness Memo as this
facility discharges to saltwater.
COMPLIANCE HISTORY
No compliance concerns in the past permit cycle.
NCG59 GENERAL PERMIT ELIGIBILITY (FOR CONVENTIONAL & GREENSAND ONLY)
Not enough data due to infrequent discharge events.
• Conclusion: Ineligible for NCG59 General Permit.
WHOLE EFFLUENT TOXICITY (WET) TESTING
The permittee shall conduct acute toxicity tests on a quarterly basis using protocols defined in the North
Carolina Procedure Document entitled "Pass/Fail Methodology For Determining Acute Toxicity In A
Single Effluent Concentration" (Revised December 2010, or subsequent versions). The monitoring shall be
performed as a Mysid Shrimp (Mysidopsis bahia) 24-hour static test. The effluent concentration at which
there may be at no time significant acute mortality is 90% (defined as treatment two in the procedure
document). The tests will be performed during the months of January, April, July and October. These
months signify the first month of each three-month toxicity testing quarter assigned to the facility. Effluent
sampling for this testing must be obtained during representative effluent discharge and shall be performed at
the NPDES permitted final effluent discharge below all treatment processes.
USE OF A DIFFERENT TEST ORGANISM
The Permittee may request the use of a different test organism upon documentation that the
alternate test organism would provide an equal or greater level of protection and is appropriate
based on the characteristics of the discharge and receiving stream. (See Section A. (2))
Fact Sheet for Permit Renewal
June 2024 - NPDES Permit NCO040061 - Page 2

A. (4.) PERMIT RE-OPERNER: ADJUST WET -TEST SPECIES
[G. S. 143-215.1(b)]
The Division may reopen this permit to alter or replace Whole Effluent Toxicity (WET) test
procedures or test species as future regulations, environmental conditions, or site conditions may
warrant.
REASONABLE POTENTIAL ANALYSIS
No current data to run RPA.
COMMENTS ON DRAFT PERMIT
The outfalls will retain numbering from the previous permit despite outfall 001 being removed.
Fact Sheet for Permit Renewal
June 2024 - NPDES Permit NC0040061 - Page 3