NC0022187_Draft Permit_20210309

ROY COOPER
Governor ; _W';
MICHAEL S. REGAN
Secretary S. DANIEL SMITH
Director NORTH CAROLINA
Environmental Quality
March 9,2021
Scott Dilling, Complex Manager
Motiva Enterprises LLC
410 Tom Sadler Road
Charlotte,North Carolina 28214
Subject: Review of NPDES Permit DRAFT
NC0022187,WWTP Grade PC-1
Motiva—Charlotte North Terminal
Mecklenburg County
To Mr. Dilling:
The Division of Water Resources(DWR or the Division)received on December 11, 2019 your
application to renew the subject permit. Please review the attached renewal draft carefully to ensure your
understanding of its limits and monitoring conditions,and to correct errors, if any.
Concurrent with this notification,the Division will solicit public comment on this draft by publishing a
notice in newspapers having circulation in the general Mecklenburg County area,as required by the
NPDES Program. Please submit your written comments(if any),to my attention,NCDEQ/DWR/
NPDES no later than April 12,2021 (approximately 30 days after receiving this document). We welcome
your written comments,but they are not mandatory.
Whole Effluent Toxicity(WET)—The Division acknowledges Motiva's request to relax WET testing
from Quarterly to Annually. However, DWR has deemed annual WET testing insufficient to evaluate
surface-water toxicity and has set Quarterly WET testing as a minimum frequency. Consequently, all
permits statewide with annual testing are being converted to Quarterly at renewal. It follows that this
request must be denied.
Data Evaluation. Since last renewal,the Division understands that Motiva has made no significant
alterations to treatment/pollution-prevention processes. In keeping with current NPDES Permitting
Guidance,DWR evaluated monitoring data by applying reasonable potential analyses(RPAs)as required
by the EPA. Each parameter of concern (POC) is considered for its potential to exceed its respective
surface water-quality standard. While some of Motiva's hydrocarbon analytical databases do not show
reasonable potential(RP), some do.
Renewal Summary-DWR updated the following:
• Total Iron is no longer a parameter of concern (POC). Monitoring is hereby discontinued.
• Total Manganese monitoring continues Monthly(limit removed) considering a
discharge to waters classified Water Supply(WS-IV).
• Turbidity data did not show reasonable potential to exceed 50 NTU,but because the
maximum predicted is greater than 50%of the allowable concentration,monitoring
continues Monthly.
North Carolina Department of Environmental Quality Division of Water Resources
'u ECO 512 North Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699-1617—919.707.9000

Scott Dilling, Complex Manager
Draft Permit Review Mar2021
• BTEX (benzene,toluene,ethylbenzene,and total xylenes) were not detected during the
previous permit cycle,and data do not show reasonable potential(RP)to exceed respective
surface water-quality standards. However, BTEX remain parameters of concern (POCs) for
petroleum bulk storage facilities.Therefore,monitoring will continue but at a frequency
reduced from Monthly to Quarterly. Benzene,however,is a carcinogen,here further
evaluated for its potential to impact water supply(WS-IV). Its permit limit is hereby
removed based on no RP but monitoring continues Monthly.
• EPA Method 625 monitoring continues Semi-Annually as a spot check for
additional POCs related to GW-REM.
• MTBE-The Permittee discontinued using this fuel additive years back and therefore it
may only appear in local discharges as a component of onsite GW-REM. Furthermore,
the Permittee mixes its GW-REM discharges with ponded stormwater for episodic
discharge. Finally,data do not show reasonable potential,therefore monitoring for
MTBE is discontinued for permit renewal.
Monthly Report Submittals: Federal regulations require electronic submittal of all program reports and
Monthly Discharge Monitoring Reports(DMRs); see Permit Condition A. (3.). Our records show that
Motiva has successfully registered for the Electronic Discharge Monitoring Report(eDMR)program. If
you have completed and submitted to DWQ an Electronic Signature Agreement, you are no longer
required to submit DMR hardcopy as back-up to the eDMR.
The NPDES standard conditions(Parts II, III, and IV), are part of this permit but are not included in this
draft document(cover,map, and Part I). The conditions are identical to your current permit except that
agency and division names have been updated. The latest version of Parts II, III, and IV are available
at https://bit.ly/2BZ4xxx and can be viewed online or downloaded as a PDF file.
Following the mandatory 30-day Public Comment period,the Division will review all pertinent comments,
if any, and take appropriate action prior to issuing an NPDES permit final.
If you have questions,please email the undersigned at [ioe.corporonAncdenr.gov]. In support of mandated
emergency response to Covid 19,most of NC state government currently functions remotely,therefore
correspondence via email is preferred.
Respectfully,
Joeift. Corpor ,P.G.
DEQ/DWR/NPDES ermitting
Enclosure: NPDES Permit NC0022187 (renewal raft)
ec: DWR/NPDES Program Files Laserfiche
DWR/OCU,Maureen Kinney
DWR/MRO,attention Cory Basinger
DWR/ATB,attention Cindy Moore
Richard Farmer[[e-mail]]
Motiva: Scott Dilling, [[e-mail]]
PWS

Permit NC0022187
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
(NPDES)
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended,
Motiva Enterprises, LLC
is hereby authorized to discharge wastewater from outfalls located at the
Motiva Charlotte No h Terminal
410 Tom Sadler Road, Charlotte
Mecklenburg County
to receiving waters designated as an unnamed tributary to Gum Branch in the Catawba River Basin in
accordance with effluent limitations,monitoring requirements, and other conditions set forth in Parts I,
II, III and IV hereof.
This permit shall become effective , 2021.
This permit and authorization to discharge shall expire at midnight on June 30, 2025.
Signed this day , 2021.
S. Daniel Smith, Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 8

Permit NC0022187
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked, and as of this issuance, any previously issued permit bearing this number is no longer effective.
Therefore,the exclusive authority to operate and discharge from this facility arises under the permit
conditions, requirements, terms, and provisions described herein.
Motiva Enterprises, LLC
is hereby authorized to:
1. continue to operate a Surface-Water Pollution Preven '. '1. fqr stormwater in proximity to
above-ground storage tanks(ASTs) and a fuel-tru ..ding rac s providing surface bulk-storage
of petroleum hydrocarbon fuels exceeding one m ice
g. .ns,these facilities utilizing;
• bermed secondary containment for AS :(with h. • •Aerated
discharge valve, normally closed
V
• oil/water separator and was , .ldin;. . • ck-lo. •ing rack) a
groundwater remediation sys,- I . Z . ith intermittent effluent
consisting of a dual ase extracti. sy s Pith carbon filtration
• stormwater detenti and wi - t piping and hand-operated
discharge valve(no clos
located at the Motiva —Charlotte North Terminal,410 Tom Sadler Road, Charlotte, Mecklenburg
County, and
2. discharge from said treatment facility via Outfall 001, a location specified on the attached map, into
an unnamed tributary to Gum Branch [stream segment 11-120-5], a waterbody currently classified
WS-IV located within subbasin 03-08-34 [HUC: 03050101] of the Catawba River Basin.
Page 2 of 8

Permit NC0022187
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.] WWTP Class PC-1; [15A NCAC 08G .0302]
During the period beginning on the effective date of the permit and lasting until expiration,the Permittee is
authorized to discharge treated stormwater from Outfall 001. Such discharges shall be limited, monitored and
reported' by the Permittee as specified below:
1
EFFLUENT CHARACTERISTICS LIMITS MONITORING REQUIREMENTS
[Parameter Codes] Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location
Flow 2(MGD) 50050 Episodic 2 Effluent
Total Suspended Solids(mg/L) C0530 30.0 mg/L 45.0 mg/L Monthly Grab Effluent
Turbidity 3 (NTU) 00070 Monthly Grab Effluent
Benzene 4(µg/L) 34030 Monthly Grab Effluent
Manganese 4(µg/L) 01055 Monthly Grab Effluent
Oil and Grease 5(mg/L) 00556 Quarterly Grab Effluent
Total Recoverable Phenolics 4(µg/L) 32730 Quarterly Grab Effluent
Toluene 4(µg/L) 34010 Quarterly Grab Effluent
Ethyl Benzene 4(µg/L) 34371 Quarterly Grab Effluent
Total Xylenes 4(µg/L) 81551 Quarterly Grab Effluent
Naphthalene 4,6(µg/L) 34696 Quarterly Grab Effluent
Acute Toxicity 7 TGE3B \ Quarterly Grab Effluent
(
`7
EPA Method 625(µg/L) 028 ) Semi-annually Grab Effluent
Footnotes:
1. Beginning on the effective date of thi e it,the permittee shall submit discharge monitoring
reports electronically using the Division's eDMR application system [see A. (4.)].
2. Flow shall be monitored with each discharge event—During periods of no flow,the
Permittee shall submit a signed, monthly Discharge Monitoring Report(DMR)indicating
"No discharge." Flow may be monitored using any one of four methods:
a) measure flow continuously via weir or flow meter(totalizer preferred)
b) calculate flow (see Rational Equation) [see A. (3.)] based on total
rainfall per unit area draining to the outfall
c) estimate flow at 20-minute intervals during the entire discharge event; or
d) report flow based on discharge pump logs.
3. Turbidity—Effluent shall not cause receiving stream turbidity to exceed 50 NTU. If receiving-
stream background exceeds 50 NTU,the effluent shall not increase background levels. Should
data warrant,Non-compliance to this Standard may require additional stream monitoring and a
Turbidity Corrective Action Plan(TCAP).
4. WET-test samples shall be collected concurrently with other POC samples, as appropriate to
monitoring frequencies.
5. Oil and Grease with EPA Method 1664 ISGT-HEMI —Where possible,the grab sample for
oil and grease should be skimmed from the surface of a quiescent(calm water)zone.
6. Naphthalene—Provided that the Permittee can demonstrate to the Division that its facility
does not now,nor has ever, stored diesel fuel or other heavy fuels, it may petition to remove
monitoring for naphthalene.
Page 3 of 8

Permit NC0022187
7. Acute Toxicity(Ceriodaphnia dubia)Pass/Fail Limit,Quarterly during the months of
January,April,July and October [see section A.(2.)].
Conditions:
• There shall be no discharge of floating solids or foam visible in other than trace amounts.
• There shall be no oily sheen traceable from the receiving stream to this outfall.
• Direct discharge of tank solids,tank-bottom water,or the rag layer is not permitted.
• Hydrostatic Tank Testing: The Permittee shall discharge no tank solids,no tank bottom-water,no tank
rag-layer;no tank[or pipe] contents,unless benzene concentration tests less than 1.19 µg/L and
toluene concentration tests less than 11 µg/L prior to discharge.
A. (2.) ACUTE TOXICITY PASS/FAIL PERMIT LI (QUARTERLY)
[15A NCAC 02B .0500 et seq.]
\/\
The permittee shall conduct acute toxicity tests on a erl basis\usInng„,protocols defined in the North
Carolina Procedure Document entitled"Pass/Fail Me of For De' "ining Acute Toxicity In A
Single Effluent Concentration"(Revised Dec 201 o ubsequent versions). The monitoring shall
be performed as a Ceriodaphnia dubia 24-hour 'tatic.lest. The effluent concentration at which there may
be at no time significant acute mortality• 0% (defined as treatment two in the procedure document).
The tests will be performed during hs o January,April,July,and October.These months
signify the first month of each thre *onth toxicit}�tsting quarter assigned to the facility. Effluent
sampling for this testing must be obtained durii'representative effluent discharge and shall be
performed at the NPDES permitted final effluent discharge below all treatment processes.
�. \ \\\�
Should any single quarterly monitoring i dicate 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.
All toxicity testing results required as part of this permit condition will be entered electronically using
the Division's eDMR system for the month in which it was performed,using the parameter code
TGE3B. Additionally, DWR Form AT-2 (original)is to be sent to the following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,NC 27699-1621
Or,results can be sent to the email,ATForms.ATB@a,ncdenr.gov.
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30
days after the end of the reporting period for which the report is made. Test data shall be complete,
accurate, include all supporting chemical/physical measurements and all concentration/response data,
and be certified by laboratory supervisor and ORC or approved designate signature. Total residual
chlorine(TRC)of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Page 4 of 8

Permit NC0022187
Should there be no discharge of flow from 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
Water Sciences Section at the address cited 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. Assessment of
toxicity compliance is based on the toxicity testing quarter, which is the three-month time interval that
begins on the first day of the month in which toxicity testing is required by this permit and continues
until the final day of the third month.
Should any test data from either these monitoring requirements or tests performed by the North Carolina
Division of Water Resources 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 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.
A. (3.) FLOW MEASUREM NT_RATITAL [G.S. 143-215.1(b)]
The Rational Equation: Q=KuCIA, where:
Q= flow (peak flow rate(cfs or m3/sec)
Ku= units conversation factor= 1.008 for U.S. standard units (usually
ignored because it is so close to 1), or 0.278 for SI units
C = dimensionless runoff coefficient for the watershed, loosely defined
as the ratio of runoff to rainfall
I= intensity of rainfall taken from the intensity-duration-frequency
curves for the specified design return period at the time of
concentration, tc(in/h or mm/h). tc=time of concentration(time
after beginning rainfall excess when all portions of the drainage
basin are contributing simultaneously to outlet flow)
A = area of tributary watershed (acres or km2)
The rational equation is used to calculate the runoff from a region, given:
• the runoff coefficient(accounts for infiltration losses in the region),
• the rainfall intensity to the region,
• the time for runoff to travel from the region's upper reaches to its
outlet, and
• the region's drainage area.
Page 5 of 8

Permit NC0022187
A. (4.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[G.S. 143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program
reports. The final NPDES Electronic Reporting Rule was adopted and became effective on December
21, 2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of this
permit(Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting >
• Section D. (6.) Records Retention !
• Section E. (5.) Monitoring Reports
i \ \
1. Reporting Requirements [Supersedes Secti nD. (2.) and Section E. (5.) (a)I
The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report(eD ' t application:
Monitoring results obtained during the pr 'o onth(s) shall be summarized for each month and
submitted electronically using eDMR. The, system allows permitted facilities to enter
monitoring data and s it DMRs electronic using the internet. The eDMR system may be
accessed at: https://deq. ov/ab tit/di visions/water-resources/edmr.
If a permittee is unable to use the clvIR system due to a demonstrated hardship or due to the facility
being physically located in an area where less than 10 percent of the households have broadband
access,then a temporary waiver from the NPDES electronic reporting requirements may be granted
and discharge monitoring data may be submitted on paper DMR forms (MR 1, 1.1, 2, 3)or
alternative forms approved by the Director. Duplicate signed copies shall be submitted to the
following address:
NC DEQ/Division of Water Resources/Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
See"How to Request a Waiver from Electronic Reporting"section below.
Regardless of the submission method,the first DMR is due on the last day of the month following
the issuance of the permit or in the case of a new facility, on the last day of the month following the
commencement of discharge.
Page 6 of 8

Permit NC0022187
Starting on December 21, 2025, the permittee must electronically report the following compliance
monitoring data and reports, when applicable:
• Sewer Overflow/Bypass Event Reports;
• Pretreatment Program Annual Reports; and
• Clean Water Act (CWA) Section 316(b) Annual Reports.
Thepermittee mayseek an electronic reporting waiver from the Division (see"How to Request a
P g q
Waiver from Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the permittee must identify the initial recipient at the time
of each electronic submission. The permittee should use the EPA's website resources to identify the
initial recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity
(EPA or the state authorized by EPA to implement the NPDES program)that is the designated entity
for receiving electronic NPDES data [see 40 CFR 127.2(b)].
EPA plans to establish a website that will alssblink to the appropriate electronic reporting tool for
each type of electronic submission and for each state. Instructions on how to access and use the
appropriate electronic reporting tool will be available as well. Information on EPA's NPDES
Electronic Reporting Rule is found at: https://www.federalregister.gov/documents/2015/10/22/2015-
24954/national-pollutant-discharge?elimination-system-npdes-electronic-reporting-rule
Electronic submissions must start by the dates listed in the"Reporting Requirements" section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an
electronic reporting waiver, a permittee must first submit an electronic reporting waiver request to
the Division. Requests for temporary electronic reporting waivers must be submitted in writing to
the Division for written approval at least sixty(60) days prior to the date the facility would be
required under this permit to begin submitting monitoring data and reports. The duration of a
temporary waiver shall not exceed 5 years and shall thereupon expire. At such time, monitoring data
and reports shall be submitted electronically to the Division unless the permittee re-applies for and is
granted a new temporary electronic reporting waiver by the Division. Approved electronic reporting
waivers are not transferrable. Only permittees with an approved reporting waiver request may
submit monitoring data and reports on paper to the Division for the period that the approved
reporting waiver request is effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found on
the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Page 7 of 8

Permit NC0022187
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II,
Section B. (11.)(a) or by a duly authorized representative of that person as described in Part II,
Section B. (11.)(b). A person, and not a position,must be delegated signatory authority for eDMR
reporting purposes.
For eDMR submissions,the person signing and submitting the DMR must obtain an eDMR user
account and login credentials to access the eDMR system. For more information on North
Carolina's eDMR system,registering for eDMR and obtaining an eDMR user account,please visit
the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make
the following certification [40 CFR 122.22]. NO OTHE, STATEMENTS OF CERTIFICATION
WILL BE ACCEPTED:
"I certify, under penalty of law, that this documen and all ittachm nts were prepared under my
direction or supervision in accordance wit a.systerkdeesigned to assure that qualified personnel
properly gather and evaluate the informati itte .' ased on my inquiry of the person or
persons who manage the system, or thou pe ns 1 er sponsible for gathering the information,
the information submitted is, to the best of my le and belief true, accurate, and complete. I
am aware that there are significant penalties f ubmitting false information, including the
possibility of fines and im,�ris mentf r iolations."
5. Records Retention [Supplements Section D. (6.)1
The permittee shall retain recorder of all Discharge Monitoring Reports, including eDMR
submissions. These records or copies shall be maintained for a period of at least 3 years from the
date of the report. This period may be extended by request of the Director at any time [40 CFR
122.41].
Page 8 of 8

DEQ/DWR/NPDES
EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL
NPDES Permit NC0022187
Joe R. Corporon,P.G.,Compliance&Expedited Permitting Unit 24Feb2021
Table 1 -Facility Information
Applicant/Facility Name Motiva Enterprises,LLC/Motiva Charlotte-North Terminal
Applicant Address 410 Tom Sadler Road,Charlotte 28214
Facility Address 410 Tom Sadler Road,Charlotte 28214
Permitted Flow(MGD) not limited
Type of Waste 100%Industrial(petroleum bulk storage); stormwater/
groundwater remediation
Facility Class PC-1 County Mecklenburg
Permit Status Renewal Regional MRO
Office
Stream Characteristics
Basin/Receiving Stream UT to Gum Branch Stream Classification WS-IV
Stream Segment [11-120-5] Drainage basin Catawba
Summer 7Q 10 (cfs) 0 Subbasin 03-08-34
Winter 7Q10(cfs) 0 Use Support No Data
30Q2 (cfs) 0 303(d) Listed No
Average Flow (cfs) 0.0 State Grid F15SW
IWC (%) 100% USGS Topo Quad Mt.Island Lake,NC
Facility Summary
Motiva Enterprises,LLC/Charlotte North Terminal(Motiva)is a minor discharger(<1 MGD)collecting
and discharging stormwater as a component of its Surface-Water Pollution Prevention Plan.This plan
manages stormwater in proximity to bulk-storage of petroleum hydrocarbons stored in aboveground storage
tanks(ASTs).Motiva produces no products.This a storage terminal for gasoline,ethanol,and petroleum
distillates.
Facilities include ASTs exceeding one million gallons of various fuels servicing a fuel-truck loading rack.
Significant changes to this facility are planned for permit renewal include the permittee's addition of
discharge from a GW-REM system.Treatment facilities contributing to Outfall 001consist of:
• bermed secondary containment for ASTs; a detention pond including a discharge line fitted
with hand-operated valve(normally closed)for combining stormwater and GW-REM effluent
• oil/water separator and waste holding tank(truck-loading rack);residuals of holding tank
hauled offsite for recycling
• a groundwater remediation system(GW-REM)consisting of a dual-phase extraction system
with carbon filtration;an intermittent discharge estimated not to exceed 1,000 gpd or 365,000
gallons per year.
Receiving Stream-Discharge from WWTP for Outfall 001 is into an unnamed tributary to Gum
Branch[Stream Segment 11-120-5]. The segment is not list in the 2018 North Carolina Integrated report
or 303(d)list.
Fact Sheet
Renewal 2021 --NPDES Permit NC0022187
Page 1

Table 2 - ANNUAL FLOW (MGD) SUMMARY-Last 36 months
Year Maximum Minimum Average Number of
Flow Flow Flow Discharges
2018 0.4711 0.0020 0.1285 52
2019 0.6008 0.0019 0.2022 38
2020 0.9543 0.0012 0.3164 46
Table 3 - MONTHLY FLOWS (MGD)-Documentation of Highest Monthly Average
(database Feb2018-Dec2020): Monthly Average Maximum flow reported=0.6199 MGD [Dec2020].
DWR used this flow for reasonable potential analysis(RPA), as conservative in favor of the environment.
(see RPA below).
2018 Maximum Minimum Average Number of
Flow Flow Flow Discharges
Per Month
(episodic)
Feb 0.1404 0.0144 0.0640 5
Mar 0.1868 0.0812 0.1329 4
Apr 0.2038 0.0271 0.0987 6
May 0.1555 0.0226 0.0768 7
Jun 0.1242 0.1101 0.1172 2
Jul 0.2018 0.0336 0.1109 3
Aug 0.2030 0.0417 0.1254 4
Sep 0.4711 0.0396 0.2555 4
Oct 0.2019 0.0020 0.1094 6
Nov 0.2025 0.0542 0.1212 6
Dec 0.3054 0.1644 0.2296 5
2019 Maximum Minimum Average Number of
Flow Flow Flow Discharges
Per Month
(episodic)
Jan 0.2713 0.1519 0.2150 3
Feb 0.3408 0.1748 0.2212 5
Mar 0.0065 0.0065 0.0065 1
Apr 0.6008 0.3843 0.4926 2
May 0.4352 0.1951 0.3290 3
Jun 0.2256 0.0019 0.1595 5
Jul 0.1129 0.0023 0.0700 4
Aug 0.2889 0.1461 0.1937 4
Sep 0.2175 0.2175 0.2175 1
Oct 0.3539 0.0062 0.1752 4
Nov 0.2256 0.0019 0.1304 3
Dec 0.4021 0.1928 0.2974 2
2020 Maximum Minimum Average Number of
Flow Flow Flow Discharges
Per Month
(episodic)
Jan 0.2944 0.2059 0.2564 4
Feb 0.5549 0.1133 0.2804 3
Mar 0.4188 0.0012 0.1698 4
Irn:v'II 2C1.` 'vI1)1 \('U1122187

Apr 0.4941 0.1641 0.3147 4
May 0.3395 0.0962 0.2240 5
Jun 0.2524 0.0825 0.1429 3
Jul 0.4140 0.1375 0.2758 2
Aug 0.3195 0.0925 0.2262 5
Sep 0.6196 0.1944 0.4497 5
Oct 0.7950 0.2562 0.4832 4
Nov 0.3234 0.2178 0.2859 3
Dec 0.9543 0.1365 0.6199* 4
*highest monthly average for three years.
Whole Effluent Toxicity(WET)-The Permittee's application to renew requests relaxing Quarterly
monitoring to Annually.However,DWR has deemed annual WET testing insufficient to evaluate toxicity
and has set Quarterly WET tests as a minimum frequency.Therefore,all permits statewide with annual
testing will be converted to Quarterly at renewal.
Motiva does not perform Chronic [TGP3B] (Ceriodaphnia dubia)typically required for groundwater
remediation(GW-REM)wastestreams deemed complex and continuous.Motiva combines GW-REM with
stormwater and manages its discharges as manually controlled,episodic.Consequently,DWR's Aquatic
Toxicity Branch(ATB)continues to recommend an Acute Toxicity 24-hour static test(Ceriodaphnia
dubia)Pass/Fail limited as a Quarterly grab sample,during the months of January,April,July,and
October[see section A. (1.)].This facility has passed all toxicity monitoring over the past eight years.
Compliance History-BIMS has no record of permit violations for the period Jan2017 thru Feb2021.
Reasonable Potential Analysis (RPA)-In accord with current permitting guidance,renewal
conducted RPAs using the"highest monthly average flow"during the previous permit cycle.DWR
considered this conservative to protect the surface-water environment.Motiva's highest monthly flow was
reported in December 2020 as 0.6199 MGD(see Table 3).The Division used this flow for renewal RPA
calculations.
Based on analytical databases reported on DMRs for the past three(3)years(Feb2018-Dec2020),DWR
conducted an RPA for BTEX [benzene,toluene,ethylbenzene,Total Xylenes],naphthalene,Total
Recoverable Phenolics,Turbidity,and MTBE(See RPA summary).The parameters Total Manganese,Total
Iron have no standard therefore were not included in the RPA,but because this facility discharges to a water
supply(WS-IV),manganese monitoring will continue,no limit.
Turbidity was evaluated for its potential to exceed 50NTU.It did not show reasonable potential,but
because the maximum predicted[32 NTU] is greater than 50%of the allowable concentration,
monitoring will continue Monthly,no limit.
Renewal Summary-DWR updated the following:
• Total Iron is no longer a parameter of concern(POC).Monitoring is hereby discontinued.
• Total Manganese monitoring continues Monthly(limit removed)considering a discharge to
waters classified Water Supply(WS-IV).
Fact Sheet
Renewal 2015--NPDES NC0022187

• Turbidity removed limit;monitoring continues Monthly.
• BTEX(benzene,toluene,ethylbenzene,and total xylenes)were not detected during the
previous permit cycle,and data do not show reasonable potential(RP)to exceed respective
surface water-quality standards.However,BTEX remain parameters of concern (POCs)for
petroleum bulk storage facilities.Therefore,monitoring will continue but at a frequency
reduced from Monthly to Quarterly.Benzene,however,is a carcinogen,here further
evaluated for its potential to impact water supply(WS-IV).Its permit limit is hereby
removed based on no RP but monitoring continues Monthly.
• EPA Method 625 monitoring continues Semi-Annually as a spot check for additional
POCs related to GW-REM.
• MTBE—The Permittee discontinued using this fuel additive years back and therefore it
may only appear in local discharges as a component of onsite GW-REM. Furthermore,
the Permittee mixes its GW-REM discharges with ponded stormwater for episodic
discharge.Finally,data do not show reasonable potential,therefore monitoring for
MTBE is discontinued for permit renewal.
Fact Sheet
Renewal 2015--NPDES NC0022187

PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice: March 9, 2021
[Tentative] Permit Scheduled to Issue: April 10, 2021
[Tentative] Effective date May 1, 2021
If you have questions,email [[e-mail]]
/")
Joe R. Co oron,P.G ,NPDE Unit. 26Feb2021
i
NPDES Implementation of Instream Dissolved Metals Standards—Freshwater Standards
The NC 2007-2015 Water Quality Standard (WQS) Triennial Review was approved by the NC
Environmental Management Commission (EMC)on November 13, 2014. The US EPA
subsequently approved the WQS revisions on April 6, 2016, with some exceptions. Therefore,
metal limits in draft permits out to public notice after April 6, 2016 must be calculated to protect
the new standards - as approved.
Table 1. NC Dissolved Metals Water Quality Standards/Aquatic Life Protection
Parameter Acute FW, µg/1 Chronic FW, Acute SW, µg/1 Chronic SW,
(Dissolved) µg/1 (Dissolved) µg/1
(Dissolved) (Dissolved)
Arsenic 340 150 69 36
Beryllium 65 6.5 --- ---
Cadmium Calculation Calculation 40 8.8
Chromium III Calculation Calculation --- ---
Chromium VI 16 11 1100 50
Copper Calculation Calculation 4.8 3.1
Lead Calculation Calculation 210 8.1
Nickel Calculation Calculation 74 8.2
Silver Calculation 0.06 1.9 0.1
Zinc Calculation Calculation 90 81
Fact Sheet
Renewal 2015--NPDES NC0022187

Table 1 Notes:
1. FW= Freshwater, SW= Saltwater
2. Calculation=Hardness dependent standard
3. Only the aquatic life standards listed above are expressed in dissolved form. Aquatic life
standards for Mercury and selenium are still expressed as Total Recoverable Metals due to
bioaccumulative concerns (as are all human health standards for all metals). It is still
necessary to evaluate total recoverable aquatic life and human health standards listed in
15A NCAC 2B.0200(e.g., arsenic at 10 µg/1 for human health protection; cyanide at 5
µg/L and fluoride at 1.8 mg/L for aquatic life protection).
Table 2. Dissolved Freshwater Standards for Hardness-Dependent Metals
The Water Effects Ratio (WER)is equal to one unless determined otherwise under 15A
NCAC 02B .0211 Subparagraph(11)(d)
Metal NC Dissolved Standard, µg/1
Cadmium,Acute WER*{1.136672-[ln hardness](0.041838)} •e^{0.9151 [In hardness]-3.1485)
Cadmium,Acute Trout waters WER*{1.136672-[ln hardness](0.041838)} •e^{0.9151[in hardness]-3.6236}
Cadmium,Chronic WER*{1.101672-[/n hardness](0.041838)} •e^{0.7998[In hardness]-4.4451}
Chromium III,Acute WER*0.316 •e^{0.8190[ln hardness]+3.7256}
Chromium III,Chronic WER*0.860•e^{0.8190[ln hardness]+0.6848}
Copper,Acute WER*0.960•e1'{0.9422[ln hardness]-1.700}
Copper,Chronic WER*0.960•e^{0.8545[ln hardness]-1.702)
Lead,Acute WER*{1.46203-[in hardness](0.145712)} •e^{1.273[ln hardness]-1.460}
Lead,Chronic WER*{1.46203-[ln hardness](0.145712)} •e^{1.273[in hardness]-4.705)
Nickel,Acute WER*0.998 •e^{0.8460[In hardness]+2.255}
Nickel,Chronic WER*0.997 •e^{0.8460[In hardness]+0.0584}
Silver,Acute WER*0.85 •e^{1.72[In hardness]-6.59}
Silver,Chronic Not applicable
Zinc,Acute WER*0.978 •e^{0.8473[In hardness]+0.884}
Zinc,Chronic WER*0.986•e^{0.8473[In hardness]+0.884}
General Information on the Reasonable Potential Analysis (RPA)
The RPA process itself did not change as the result of the new metals standards. However,
application of the dissolved and hardness-dependent standards requires additional consideration in
order to establish the numeric standard for each metal of concern of each individual discharge.
The hardness-based standards require some knowledge of the effluent and instream(upstream)
hardness and so must be calculated case-by-case for each discharge.
Metals limits must be expressed as `total recoverable' metals in accordance with 40 CFR
122.45(c). The discharge-specific standards must be converted to the equivalent total values for
use in the RPA calculations. We will generally rely on default translator values developed for each
metal (more on that below),but it is also possible to consider case-specific translators developed in
accordance with established methodology.
Fact Sheet
Renewal 2015--NPDES NC0022187

RPA Permitting Guidance/WQBELs for Hardness-Dependent Metals - Freshwater
The RPA is designed to predict the maximum likely effluent concentrations for each metal of
concern, based on recent effluent data, and calculate the allowable effluent concentrations,based
on applicable standards and the critical low-flow values for the receiving stream.
If the maximum predicted value is greater than the maximum allowed value(chronic or acute), the
discharge has reasonable potential to exceed the standard, which warrants a permit limit in most
cases. If monitoring for a particular pollutant indicates that the pollutant is not present(i.e.
consistently below detection level), then the Division may remove the monitoring requirement in
the reissued permit.
1. To perform a RPA on the Freshwater hardness-dependent metals the Permit Writer
compiles the following information:
• Critical low flow of the receiving stream, 7Q10 (the spreadsheet automatically
calculates the 1Q10 using the formula 1Q10=0.843 (s7Q10, cfs) a993
• Effluent hardness and upstream hardness, site-specific data is preferred
• Permitted flow
• Receiving stream classification
2. In order to establish the numeric standard for each hardness-dependent metal of concern
and for each individual discharge, the Permit Writer must first determine what effluent and
instream (upstream) hardness values to use in the equations.
The permit writer reviews DMR's, Effluent Pollutant Scans, and Toxicity Test results for
any hardness data and contacts the Permittee to see if any additional data is available for
instream hardness values, upstream of the discharge.
If no hardness data is available, the permit writer may choose to do an initial evaluation
using a default hardness of 25 mg/L (CaCO3 or(Ca+ Mg)). Minimum and maximum
limits on the hardness value used for water quality calculations are 25 mg/L and 400 mg/L,
respectively.
If the use of a default hardness value results in a hardness-dependent metal showing
reasonable potential, the permit writer contacts the Permittee and requests 5 site-specific
effluent and upstream hardness samples over a period of one week. The RPA is rerun using
the new data.
The overall hardness value used in the water quality calculations is calculated as follows:
Combined Hardness (chronic)
= (Permitted Flow, cfs *Avg. Effluent Hardness, mg/L) x (s7Q10, cfs *Avg. Upstream Hardness,
mg/L)
(Permitted Flow, cfs + s7Q10, cfs)
The Combined Hardness for acute is the same but the calculation uses the 1Q10 flow.
3. The permit writer converts the numeric standard for each metal of concern to a total
recoverable metal, using the EPA Default Partition Coefficients (DPCs) or site-specific
translators, if any have been developed using federally approved methodology.
Fact Sheet
Renewal 2015--NPDES NC0022187

EPA default partition coefficients or the"Fraction Dissolved"converts the value for
dissolved metal at laboratory conditions to total recoverable metal at in-stream ambient
conditions.This factor is calculated using the linear partition coefficients found in The
Metals Translator: Guidance for Calculating a Total Recoverable Permit Limit from a
Dissolved Criterion(EPA 823-B-96-007,June 1996)and the equation:
_Cdl,, = 1
Ctotat 1 + } [Kpo] [ss(l+a)] [10-6] }
Where:
ss=in-stream suspended solids concentration[mg/1],minimum of 10 mg/L used,and
Kpo and a=constants that express the equilibrium relationship between dissolved and
adsorbed forms of metals.A list of constants used for each hardness-dependent metal can
also be found in the RPA program under a sheet labeled DPCs.
4. The numeric standard for each metal of concern is divided by the default partition
coefficient(or site-specific translator)to obtain a Total Recoverable Metal at ambient
conditions.
In some cases, where an EPA default partition coefficient translator does not exist(ie.
silver),the dissolved numeric standard for each metal of concern is divided by the EPA
conversion factor to obtain a Total Recoverable Metal at ambient conditions. This method
presumes that the metal is dissolved to the same extent as it was during EPA's criteria
development for metals. For more information on conversion factors see the June, 1996
EPA Translator Guidance Document.
5. The RPA spreadsheet uses a mass balance equation to determine the total allowable
concentration(permit limits) for each pollutant using the following equation:
Ca=(s7Q10+ Qw) (Cwqs)—(s7Q10) (Cb)
Qw
Where: Ca=allowable effluent concentration(µg/L or mg/L)
Cwqs=NC Water Quality Standard or federal criteria(µg/L or mg/L)
Cb=background concentration: assume zero for all toxicants except NH3* (µg/L or
mg/L)
Qw=permitted effluent flow(cfs,match s7Q10)
s7Q10= summer low flow used to protect aquatic life from chronic toxicity and human
health through the consumption of water, fish, and shellfish from noncarcinogens (cfs)
* Discussions are on-going with EPA on how best to address background
concentrations
Flows other than s7Q10 may be incorporated as applicable:
1Q10=used in the equation to protect aquatic life from acute toxicity
QA=used in the equation to protect human health through the consumption of
water, fish, and shellfish from carcinogens
30Q2=used in the equation to protect aesthetic quality
Fact Sheet
Renewal 2015--NPDES NC0022187

6. The permit writer enters the most recent 2-3 years of effluent data for each pollutant of
concern. Data entered must have been taken within four and one-half years prior to the date
of the permit application (40 CFR 122.21). The RPA spreadsheet estimates the 95th
percentile upper concentration of each pollutant. The Predicted Max concentrations are
compared to the Total allowable concentrations to determine if a permit limit is necessary.
If the predicted max exceeds the acute or chronic Total allowable concentrations, the
discharge is considered to show reasonable potential to violate the water quality standard,
and a permit limit (Total allowable concentration) is included in the permit in accordance
with the U.S. EPA Technical Support Document for Water Quality-Based Toxics Control
published in 1991.
7. When appropriate, permit writers develop facility specific compliance schedules in
accordance with the EPA Headquarters Memo dated May 10, 2007 from James Hanlon to
Alexis Strauss on 40 CFR 122.47 Compliance Schedule Requirements.
8. The Total Chromium NC WQS was removed and replaced with trivalent chromium and
hexavalent chromium Water Quality Standards. As a cost savings measure, total chromium
data results may be used as a conservative surrogate in cases where there are no analytical
results based on chromium III or VI. In these cases, the projected maximum concentration
(95th %) for total chromium will be compared against water quality standards for
chromium III and chromium VI.
9. Effluent hardness sampling and instream hardness sampling, upstream of the discharge, are
inserted into all permits with facilities monitoring for hardness-dependent metals to ensure
the accuracy of the permit limits and to build a more robust hardness dataset.
10. Hardness and flow values used in the Reasonable Potential Analysis for this permit
included:
Parameter Value Comments (Data Source)
Average Effluent Hardness (mg/L) N/A No RPA necessary
[Total as, CaCO3 or(Ca+Mg)]
Average Upstream Hardness (mg/L) N/A No RPA necessary
[Total as, CaCO3 or(Ca+Mg)]
7Q10 summer(cfs) N/A No RPA necessary
1 Q 10 (cfs) N/A No RPA necessary
Permitted Flow (MGD) N/A No RPA necessary
Fact Sheet
Renewal 2015--NPDES NC0022187

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Motiva Enterprises, LLC Facility
Charlotte-North Terminal Location X
State Grid/Quad: F15SW/Mt Island Lake,NC Permitted Flow: not limited not to scale
Latitude: 35°16'59"N Longitude: 80°56' 10"W NPDES Permit NC0022187
Receiving Stream: UT to Gum Branch[11-120-5] Sub-Basin: 03-08-34 ]�TO j.�]�
Drainage Basin: Catawba River Basin Stream Class: WS-IV 1 Y �6 Mecklenburg County