NC0022209_Fact Sheet_20210726

DEQ / DWR / NPDES
EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL
NPDES Permit NC0022209
Joe R. Corporon P.G., Compliance & Expedited Permitting Unit
26Ju12021
Table 1 - Facility Information
Applicant/Facility Name
Motiva Enterprises, LLC /
Motiva - Greensboro Terminal [see APP, page 2]
Applicant Address
101 S Chimney Rock Road, Greensboro, NC 27409
Facility Address
Same
Facility Contacts
John Herman, Terminal Manager
Megan Boush, Env. Coordinator 713-427-3517
Permitted Flow (MGD)
not limited
Type of Waste
100% Industrial [fuel hydrocarbon bulk storage]
Facility Treatment Class
Grade PCNC
County
Guilford
Permit Status
Renewal
Regional Office
WSRO
Stream Characteristics
Receiving Stream
UT to Long Branch
Stream Classification
WS-IV*
Stream Segment
[17-2-1-(1)]
Drainage basin
Cape Fear
Summer 7Q10 (cfs)
0
Subbasin
[HUC]
03-06-08
[HUC: 030300030102]
Winter 7Q10 (cfs)
0
Use Support
Impaired (Cat 5): Fish
Tissue Hg, Benthos Fair,
Fish Community Fair.
30Q2 (cfs)
0
303(d) Listed
Average Flow (cfs)
0
State Grid
C 19 SW
IWC (%)
100%
USGS Topo Quad
Guilford, NC
Since last renewal, the Permittee has not altered this treatment system.
Compliance: BIMS records only one violation (reporting) during the previous permit cycle,
described by Tricia Lowery (WSRO) as a "Permittee reporting error" / no action BPJ (27May2021).
Facility Summary: Motiva Enterprises LLC - Greensboro Terminal (Motiva or the Permittee) is a
minor industry (flow <1 MGD) operating an existing Surface -Water Pollution Control System for wastes
and stormwaters held in proximity to above -ground storage tanks (ASTs). Surface fuel storage of
hydrocarbon fuels exceeds one million gallons, therefore the discharges described herein may NOT be
permitted under Stormwater Regulations. This facility utilizes:
• diked areas (secondary containment of ASTs and piping)
• truck loading -rack drains that flow to a concrete pit with sump
pump for transfer to AST secondary containment
• AST with hydrocarbon detector (8,000 gallon), contents may
be released into diked area or disposed off -site if contaminated
• settling pond with discharge piping
• discharge control valve, manually operated (normally closed)
Regarding Motiva's Requests to Discontinue Monitoring [see APP cover letter, page 1)
Motiva requests to discontinue monitoring of the parameters Benzene, Toluene, Ethyl Benzene and Xylene
(BTEX), methyl tert-butyl ether (MTBE), Naphthalene and Total Recoverable Phenolics, "...based on the
facility' s exceptional performance for the past three years." However, while Motiva's discharge record is
extemporary over the previous permit cycle, most of the above listed analytes remain parameters of
Page 1 of 8

concern (POC) based on the site usage and activities. That stated, several analytes have been discontinued
for renewal, and others are renewed at a reduced monitoring frequency based on this record (see Summary
of Changes for This Renewal).
Reasonable Potential Analyses (RPA)
An RPA was conducted on the parameters BTEX, Naphthalene, MTBE and Total Recoverable
Phenolics; none were not detected above the lab PQL during the previous permit cycle, and none
show reasonable potential (see attached RPA and Summary of Changes for This Renewal).
Summary of Changes for This Renewal:
1. updated facility description on the supplement to permit cover sheet
2. updated text for WET testing [Condition A. (3.)]
3. updated facility map
4. BTEX, Naphthalene, Oil & Grease, and Turbidity remain POCs based on current
site usage and activities. However, these analytes were not detected above lab PQLs
during the previous permit cycle; therefore, monitoring is reduced from Monthly to
Quarterly.
5. MTBE monitoring discontinued; not detected during the previous permit cycle;
Motiva has not used this fuel additive since 2010.
6. Total Recoverable Phenolics monitoring discontinued; not detected; no longer
considered POC per current permitting guidance.
Table 2 - ANNUAL FLOWS in Million Gallons per Day (MGD) - Past 43 months
Year
Maximum
Flow
Minimum
Flow
Average
Flow
Number of
Discharges
2018
1.009
0.0006
0.1052
71
2019
0.996
0.009
0.1135
71
2020
0.214
0.0352
0.0957
52
2021
0.1263
0.0138
0.0740
6
Table 3 - MONTHLY FLOWS - Database Jan2018-Jun2021
To facilitate a reasonable potential analysis (RPA) required by EPA, DWR documents the highest reported
monthly average flow as conservative to protect the environment (see 0.3821 MGD, Feb2019).
2018
Maximum
Flow
Minimum
Flow
Average
Flow
Number of
Discharges
Per Month
(episodic)
MGD
MGD
MGD
n
Jan
0.094
0.063
0.076
5
Feb
0.121
0.083
0.1012
3
Mar
0.094
0.026
0.0691
7
Apr
0.147
0.018
0.0955
3
May
0.131
0.066
0.095
3
Jun
0.120
0.0006
0.059
4
Fact Sheet
Renewal 2021 -- NPDES NC0022209
Page 2

Jul
1.009
0.0865
0.3345
4
4Aug
0.1837
0.0541
0.1065
9
Sep
0.185
0.0461
0.1026
4
Oct
0.2203
0.0232
0.1062
5
Nov
0.2251
0.0856
0.1193
8
Dec
0.1338
0.0509
0.0868
12
2019
Maximum
Flow
Minimum
Flow
Average
Flow
Number of
Discharges
Per Month
(episodic)
MGD
MGD
MGD
n
Jan
0.1181
0.0239
0.0855
7
Feb
0.996
0.0865
0.3821*
6
Mar
0.113
0.0432
0.0694
6
Apr
0.124
0.0652
0.0974
5
May
0.0958
0.049
0.067
3
Jun
0.215
0.0615
0.1173
7
Jul
0.154
0.0345
0.0880
7
Aug
0.166
0.049
0.0999
9
Sep
0.009
0.009
0.009
1
Oct
0.279
0.0424
0.1142
7
Nov
0.102
0.0432
0.0627
4
Dec
0.174
0.0102
0.0744
9
2020
Maximum
Flow
Minimum
Flow
Average
Flow
Number of
Discharges
Per Month
(episodic)
MGD
MGD
MGD
n
Jan
0.0513
0.0483
0.0498
2
Feb
0.188
0.061
0.0942
9
Mar
0.1215
0.0921
0.1068
2
Apr
0.137
0.080
0.1083
3
May
0.214
0.060
0.1357
9
Jun
0.1414
0.0325
0..682
5
Jul
0.1287
0.0963
0.1125
2
Aug
0.1851
0.0551
0.1067
4
Sep
0.0182
0.0557
0.0970
6
Oct
0.0426
0.0426
0.0426
1
Nov
0.0334
0.0334
0.0334
1
Dec
0.1286
0.0394
0.0078
8
202 1
Maximum
Flow
Minimum
Flow
Average
Flow
Number of
Discharges
Jan
0.1132
0.1132
0.1132
1
Feb
0.1263
0.1263
0.1263
1
Mar
0.0898
0.0898
0.0898
1
Apr
0.0692
0.0692
0.0692
1
May
0.0138
0.0138
0.0138
1
Jun
0.0314
0.0314
0.0314
1
* Highest monthly average for four (4) years = 0.3821 MGD, Feb2019. This figure is used to
evaluate reasonable potential to exceed SWQ standards.
Fact Sheet
Renewal 2021 -- NPDES NC0022209
Page 3

Rationale for Whole Effluent Toxicity (WET): WET testing is herein renewed as Quarterly,
Acute using Fathead Minnow (Pimephalespromelas), [TAE6C] as 24-hr definitive, LC-50 >100%. Acute
WET test history demonstrates no toxicity issues [See BIMS monitoring data].
This facility combines stormwater with product -contact wastes constituting a complex wastestream
discharging episodically. This and similar facilities typically discharge under zero flow receiving -stream
conditions (IWC = 100%). Acute WET testing is deemed appropriate to evaluate end -of -pipe short-term
impacts of episodic discharges and is conducted @ 90% effluent concentration. [REF Memo: Coleen
Sullins, Director DWR, 1999].
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice:
[Tentative] Permit Scheduled to Issue:
[Tentative] Effective date
July 27, 2021
September 5, 2021
October 1, 2021
If you have questions about this permit or how renewal was prepared, please email
[j oe. [e-mail]].
Joe R. Co • oron, P 1 ., NPDS Unit. 26Ju1 2021
NPDE Impleme tation 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 Ouality Standards/Auuatic Life Protection
Parameter
Acute FW, µg/1
(Dissolved)
Chronic FW,
1.1g/1
(Dissolved)
Acute SW, µg/1
(Dissolved)
Chronic SW,
1.1g/1
(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 2021 -- NPDES NC0022209
Page 4

Table 1 Notes:
1. FW= Freshwater, SW= Saltwater
2. CatIll = 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-[lnhardness](0.041838)} •e^{0.9151 [lnhardness]-3.1485}
Cadmium, Acute Trout waters
WER* {1.136672-[lnhardness](0.041838)} • e^ {0.9151 [In hardness]-3 .6236}
Cadmium, Chronic
WER* {1.101672-[lnhardness](0.041838)} •e^{0.7998[lnhardness]-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 • e^ {0.9422[ln hardness]-1 .700 }
Copper, Chronic
WER*0.960 • e^{0.8545[ln hardness]-1.702}
Lead, Acute
WER* { 1.46203-[ln hardness](0.145712)} • e^{ 1.273[ln hardness]-1.460}
Lead, Chronic
WER* {1.46203-[ln hardness](0.145712)} • e^{1.273[ln hardness]-4.705}
Nickel, Acute
WER*0.998 • e^{0.8460[lnhardness]+2.255}
Nickel, Chronic
WER* 0.997 • e^ {0.8460[ln hardness]+0 .0584 }
Silver, Acute
WER* 0.85 • e^ { 1.72 [1n hardness]-6.59 }
Silver, Chronic
Not applicable
Zinc, Acute
WER* 0.978 • e^ {0.8473[ln hardness]+0 .884}
Zinc, Chronic
WER* 0.986 • e^ {0.8473 [ln 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 2021 -- NPDES NC0022209
Page 5

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) 0.993
• 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 1 Q 10 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 2021 -- NPDES NC0022209
Page 6

EPA default partition coefficients or the "Fraction Dissolved" converts thevalue for
dissolved metal at lab oratory conditions to total recoverable metal at in -stream ambient
conditions. This factor is calculatedusingthe linear partition coefficients found in The
Metals Translator: Guidance for Calculating a Total Recoverable PermitLimit from a
Dissolved Criterion (EPA 823-B-96-007, June 1996) and the equation:
Caiss = 1
Ctotai 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 ofmetals. A list of constants used for each hardness -dependent metal can
also be found in the RPAprogramundera 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) — (s7Q 1 0) (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 s7Q 10)
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 maybe incorporated as applicable:
1 Q 10 = 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 2021 -- NPDES NC0022209
Page 7

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)
[Total as, CaCO3 or (Ca+Mg)]
N/A
Not applicable
Average Upstream Hardness (mg/L)
[Total as, CaCO3 or (Ca+Mg)]
N/A
Not applicable
7Q10 summer (cfs)
N/A
Not applicable
1Q10(cfs)
N/A
Not applicable
Permitted Flow (MGD)
N/A
Not permitted
Fact Sheet
Renewal 2021 -- NPDES NC0022209
Page 8