NC0027006_Fact Sheet_20240729

NCDEQ / DWR / NPDES
EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL
NPDES Permit NCO027006
Sara Bassett / Compliance & Expedited Permitting Unit / sara.bassett(kdeq.nc.gov / July 2024
FACILITY INFORMATION
Facility Name
Selma West Oak Street Terminal
Facility Contact
Robert Jarabeck
Owner
MPLX Terminals LLC
Mailing Address
2555 West Oak Street, Selma, NC 27576
Facility Physical Address
Same as mailing
Max, Monthly Avg Flow (MGD)
0.146 MGD
Type of Waste
Stormwater held in proximity to above -ground storage tanks
(ASTs) containing fuel hydrocarbons >lmillion gallons.
Facility Class
PC-1
County
Johnston
Permit Status
Renewal
Regional Office
RRO
STREAM CHARACTERISTICS
Receiving Stream
UT to Mill Creek (at
Selma)
Stream
Classification
WS-V; NSW
Stream Segment
27-40
Outfall Lat.
35033'02.2"N
7Q10 - Summer (cfs)
0
Outfall Long.
78018'43.9"W
7Q 10 - Winter (cfs)
0
Drainage basin
Neuse
30Q2 (cfs)
0
Subbasin
03-04-02
Average Flow (cfs)
0
HUC
0302020111
1WC (%)
100%
303(d) List
No
FACILITY SUMMARY
This facility confines stormwater and maintenance wastewater behind bermed areas [dikes]. These
dikes are equipped with drain pipes controlled by hand -operated valves, normally closed. This
controlled discharge constitutes a point source to the environment. Because this facility stores fuel
hydrocarbons at the ground surface at quantities exceeding one (1) million gallons, it is specifically
excluded from coverage under conventional stormwater regulations, therefore historically
permitted under an individual NPDES permit.
The maximum monthly average flow in the last three years (May 2021-May 2024) was 0.146 MGD.
System components:
• earthen berms [dikes] surrounding ASTs
• discharge piping draining to an oil/water separator (off -site recycle)
• truck -loading rack containment for drain -down (petroleum -contact water)
• oil/water separator (off -site recycle)
• holding pond with discharge control valve (motor -operated, normally
closed)
• v-notch weir and ultra -sonic flow meter
RENEWAL SUMMARY
Fact Sheet for Permit Renewal
July 2024 - NPDES Permit NCO027006 - Page 1

This renewal contains the following changes:
• Section A. (5.) has been updated regarding electronic submission of effluent data. Federal
regulations require electronic submittal of all discharge monitoring reports (DMRs).
• Section A. (2.) regarding flow measurement has been updated to the most current version along
with the corresponding footnote 2 in Section A. (1.).
• A Monthly Average limit for Total Suspended Solids has been added to Section A. (1.).
• A Monthly Average limit for Toluene has been added to Section A. (1.).
• As the receiving stream is not impaired for Turbidity, monitoring for this parameter has been
removed from Section A. (l.).
• Whole Effluent Toxicity (WET) - In accordance with new Permitting Guidance statewide, WET
testing may not be permitted less frequently than Quarterly. Therefore, Quarterly monitoring has
been restored to this permit [see Section A. (L) and A. (3.)].
• Monitoring for semi -volatile compounds (EPA Method 625) has been removed from Section A. (1.)
as there have not been any detections reported in the last two permit cycles.
COMPLIANCE HISTORY
No compliance concerns in the past permit cycle.
WHOLE EFFLUENT TOXICITY (WET) TESTING
The permittee shall conduct quarterly acute toxicity tests using protocols defined as definitive in E.P.A.
Document EPA/600/4-90/027 entitled "Methods for Measuring the Acute Toxicity of Effluents to
Freshwater and Marine Organisms." The monitoring shall be performed as a Fathead Minnow (Pimephales
promelas) 24-hour static test. Effluent samples for self -monitoring purposes must be obtained below all
waste treatment. The tests will be performed on a discharge event during each quarter (January -March,
April -June, July -September, October -December).
NOTE: Previous relaxed annual monitoring shall no longer be sufficient. New Guidance outlines NC
WET testing minimum frequency is quarterly statewide.
Facility has not failed any WET tests in the last permit cycle.
REASONABLE POTENTIAL ANALYSIS
Toluene: Reasonable potential to exceed NC WQ Standard. Adding limit and increasing monitoring
frequency to monthly.
Benzene: No RP, maintaining quarterly monitoring frequency.
Xylene, Mixture: No RP, maintaining quarterly monitoring frequency.
Ethylbenzene: No RP, maintaining quarterly monitoring frequency.
Total Recoverable Phenolics: No RP, maintaining quarterly monitoring frequency.
Naphthalene: No RP, maintaining quarterly monitoring frequency.
FLOW (MGD) May2021-May2023:
• Outfall 001 Max Ave Discharges (n)
• May 2021- May 2022 0.061 0.036 45
Fact Sheet for Permit Renewal
July 2024 - NPDES Permit NCO027006 - Page 2

• May 2022- May 2023 0.22 0.048 23
• May 2023- May 2024 0.042 0.027 30
Outfall 001 - Reasonable Potential Analysis "A) — Not Conducted Because:
• BTEX not detected n = 10
• Phenol not detected n = 17
• Oil & Grease n = 17 Ave = 8.00 mg/L Max=57.45 mg/L
Ave without outlier value = 4.9 mg/L
• Total Suspended Solids (TSS) n = 17 Ave = 3.52 mg/L Max=17.1 mg/L
COMMENTS ON DRAFT PERMIT
Fact Sheet for Permit Renewal
July 2024 - NPDES Permit NC0027006 - Page 3