NC0027006_Compliance Evaluation Inspection_20220418

April 18, 2022
Michael Gray
Environmental Compliance Manager/East
[e-mail]
539 S Main St
Findlay, OH 45840
Subject: Compliance Evaluation Inspection
MPLX – Selma Terminal
NPDES Permit No. NC0027006
Johnston County
Permittee:
On Thursday, March 24, 2022, Jason Robinson of the NC Division of Water Resource’s Raleigh Regional
Office (RRO) conducted an inspection of the MPLX – Selma Terminal at 2555 W Oak St in Selma. The
purpose of this inspection was to ensure compliance with the subject NPDES Permit. During the
inspection, the presence and cooperation by Bob Jarabeck, Roger Lamberth (ORC) and Felix Jimenz
(bORC) was appreciated.
The NPDES Compliance inspection consisted of the following:
x Review of the NPDES permit
x Review of the Owner/facility information
x Review of monitoring data
x Review of log book.
x On-site inspection of the treatment facility
Findings during the pre-inspection file review were as follows:
1.The most recent permit that covers the discharge from this facility became effective on July 1, 2018
and expires on March 31, 2023. Please submit a renewal application within 180 days of expiration of
the permit.
2.DWR last inspected this facility for NPDES compliance on March 8, 2018.
3.No violations have been reported since the last inspection.
Findings during the inspection were as follows:



 



4. Staff reviewed the Permit Contact Report generated by NCDWR’s Basinwide Information
Management System (BIMS). Several updates were made to the facility contacts.

5. The facility utilizes a Field Task Maintenance System (FTMS), a program with a checklist of tasks.

6. Section A.(1.) of the permit requires the permittee to monitor discharges at Outfall #001 and submit
monthly Electronic Reporting of Discharge Monitoring Reports (eDMRs):

x Samples are collected at the discharge of the aerated pond.
x Samples are collected and kept on ice and transported to Pace Laboratories by Pace staff or
their courier. Most parameters are analyzed at Pace’s Asheville location (Certified Lab #40)
and Huntersville location (Certified Lab #12). Samples for Whole Effluent Toxicity (WET) test
are done at Pace Analytical National Testing Center. Please confirm the Lab Certification #
for this facility. According to the DWR Aquatic Toxicology Branch (ATB), this facility is #9
(not #041, which appears to be the number for the old lab before it was changed to Pace).
x A cursory review was done of bench sheets, chain of custodies and laboratory results since
the last inspection. Lab data was found to be complete with no issues.
x Laboratory results from April and October 2021 were compared to the facility’s submitted
eDMRs, and no discrepancies were observed.
x Based on the Division’s Basinwide Information System (BIMS), facility staff, and the inspectors
cursory review of laboratory data, no limit/monitoring violations have been reported or
occurred since the last inspection.
x The annual WET (Whole Effluent Toxicity) testing and the semi-annual EPA Method 625
testing were last done on July 14, 2021.
x Flow is measured using an ultrasonic flow meter.
x The inspector confirmed that monitoring data was kept on-site for at least three years.
x The permittee is reminded to include the “Certified Lab #s” on the eDMR reports.

7. The treatment facility consists of two oil/water separators (both off-site recycle), an aerated storage
pond with discharge control valve (motor-operated, normally closed) and a v-notch weir and ultra-
sonic flow meter.

x Separator #1: Stormwater runoff and associated wash water from the loading rack pup manifold,
rack manifold, additive pump off, truck pump off containment area and the vapor recovery unit
containment area flow into oil/water separator #1. This oil/water separator is a 10,0000-gallon
Enquip separator with a design capacity of 400 gallons/minute and is double-walled with an
interstitial probe. A hydrocarbon sensor is in the water compartment to sound an alarm if oil
enters the water compartment. Water that leaves Separator #1 flows to Separator #2.

x Separator #2: Rainwater that collects in the containment area from the Above Ground Storage
Tanks and parking area are routed through oil/water separator #2, along with the water from
Separator #1.

x Aerated Storage Pond: The combined flows from the oil-water separators discharge into the
aerated pond. The pond is constantly aerated. Flow from the pond is measured with an
ultrasonic flow meter as water flows over a v-notch weird to a valve controlled basin. Discharge
occurs when the valve is open. Flow is measured by an ISCO 3010 ultrasonic flow meter. The
meter is calibrated once a year by Clear Water Calibration and was last calibrated on November
11, 2021. The aerator was working during the time of the inspection, and the pond appeared



 



clean and no sheens were observed.

8. The NPDES Permit authorizes the discharge from the facility to an unnamed tributary of Mill Creek, a
waterbody currently classified WS-IV; NSW within the Neuse River Basin. The discharge point is in the
wooded area outside the fence of the facility, and was not observed.

Thank you again for your cooperation. If you have any questions regarding the attached reports or any of
the findings, please contact Jason Robinson at [e-mail].

Sincerely,

Vanessa Manuel, Assistant Regional Supervisor
Water Quality Regional Operations Section
Raleigh Regional Office
Division of Water Resources, NCDEQ

ATTACHMENTS
x Compliance Inspection Report

Cc: Raleigh Regional Office and Laserfiche
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