NC0026247_Modification 2014_20141006

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NCDENR
North Carolina Department of Environment and Natural Resources
Pat McCrory John E. Skvarla, III
Governor Secretary
October 6, 2014
Dr. Barbara Castleberry, Environmental Coordinator
TransMontaigne Operating Company, L.P.
200 Mansell Court East, Suite 600
Roswell, Georgia 30076
Subject: NPDES Permit Modification (MOD)
NCO026247 — Class 1 physical / Chemical
TransMontaigne Greensboro Southeast Terminal
6801 West Market Street, Greensboro
Guilford County
Dear Dr. Castleberry:
The Division of Water Resources (the Division) has found an error in your active permit, effective December
1, 2011. The parameter code for Total Suspended Solids (TSS) should read C0530 - not C0556.
We have therefore generated change -pages to correct this error. Please insert these pages into your existing
permit and discard the old pages. We regret any inconvenience this may have caused your organization.
This permit is not transferable except after notifying the Division of Water Resources. The Division may
require permit modification, or revocation and re- issuance. Please note that this permit does not affect your
legal obligation to obtain other permits required by the Division of Water Resources, the Division of Land
Resources, the Coastal Area Management Act, or other federal or local governments.
If you have questions, or if we can further assist you, please contact Joe Corporon at
[ioe.corporon(,ncdenr.gov] or call his direct line 919- 807 -6394.
Respe fully,
Thomas A. Reeder, Direct
Division of Water Resources
Enclosure: NPDES Permit NCO069256 (change pages 3 & 4 - permit modification)
hc: Central Files
NPDES Program Files
WSRO /SWPS, Attn: Corey Basinger
ec: Aquatic Toxicology Branch, Attn: Susan Meadows
Barbara Castleberry TransMontaigne (Permittee)
1617 Mail Service Center, Raleigh, North Carolina 27699 -1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: 919 - 807 -64921 Customer Service: 1- 877 -623 -6748
Internet www.ncwaterquality.org
An Equal Opportunity 1 Affirmative Action Employer

Ir
Permit NCO026247
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to
discharge from Outfa11001. Such discharges shall be limited and monitored by the Permittee as
specified below:
EFFLUENT
CHARACTERISTICS
PARAMETER
CODES
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location
Flowl
50050
Episodic
1
Effluent
Total Suspended Solids
C0530
45.0 mg/L
Monthly
Grab
Effluent
Oil & Grease 2
00556
Monthly
Grab
Effluent
Total Recoverable
Phenolics
32730
Quarterly 3
Grab
Effluent
Benzene
34030
Quarterly 3
Grab
Effluent
Toluene
34010
Quarterly 3
Grab
Effluent
Ethyl Benzene
34371
Quarterly 3
Grab
Effluent
Naphthalene
34696
Quarterly 3
Grab
Effluent
Xylene
81551
Quarterly 3
Grab
Effluent
MTBE
22417
Quarterly 3
Grab
Effluent
Acute Toxicity 4
TAE6C
Annually
Grab
Effluent
Footnotes:
1. Flow — During periods of no flow, the Permittee shall submit a monthly Discharge Monitoring
Report (DMR) indicating "No discharge." Flow shall be monitored with each discharge event
and may be monitored in one of four ways:
a. measure flow continuously;
b. calculate flow [using rational equation, see A. (2.)] based on total rainfall per area
draining to the outfall; exclude built -upon area (best method for facilities with large
runoff - collection ponds;
c. estimate flow at 20- minute intervals during the entire discharge event; or
d. report flow based on discharge pump logs.
2. Oil and Grease — Where possible, the grab sample for oil and grease should be skimmed
from the surface of a quiescent (calm water) zone.
3. If this parameter is detected during routine Quarterly monitoring, the Permittee shall immediately
notify the Division and immediately revert to Monthly monitoring until permit expiration.
4. Acute Toxicity (Fathead Minnow, 24- hour), Annual [see A. (1)].
Units: mg/L = milligrams per liter
µg/1 = micrograms per liter
lbs. /day = pounds per day
MTBE = methyl tertiary butyl ether
The Permittee shall discharge no floating solids or foam.
The Permittee shall discharge no tank solids, tank bottom water, or the tank rag layer.
The Permittee shall not discharge tank (or pipe) contents following hydrostatic testing unless benzene
concentration is less than 1.19µg/L and toluene concentration is less than 11gg/L.
Page 3

Permit NC002$247
A. (2.) FLOW MEASUREMENT - RATIONAL EQUATION
The Rational Equation is one method for calculating runoff; see DWQ's Stormwater BMP Manual,
Chapter 3, Stormwater Calculations at the following website:
http://i)ortal.ncdenr.oriz/web/WA/ws/su/bml2-manual
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 the beginning of
rainfall excess when all portions of the drainage basin are contributing
simultaneously to flow at the outlet).
A = area of tributary watershed (acres or km2)
The rational equation is used to calculate the runoff from a region, given:
the runoff coefficient which accounts for infiltration and other potential
losses in the region,
the rainfall intensity to the region,
the time it takes for runoff to travel from the region's upper reaches to its
outlet, and the region's drainage area.
Page 4