NC0021962_Wasteload Allocation_19940531

4 lg9to k�a,`Mw 43r, AZ Spar Web
NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NCO021962
PERMITTEE NAME: CITGO Petroleum Corporation
FACILITY NAME: Paw Creek Terminal
Facility Status: Existing
Permit Status: Renewal
Major
Pipe No.: 001
Design Capacity:
Domestic (% of Flow):
Industrial (% of Flow):
Minor
100 %
Comments:
stormwater runnoff from tank farm SttirzA4c-FActLrIESA�ZG
I MkLLIIYJ C1/+��o,, .
RECEIVING STREAM: an unnamed tributary to Gum Branch
Class: WS-IV
Sub -Basin: 03-08-34
Reference USGS Quad: F15SW
County: Mecklenburg
Regional Office: Mooresville Regional Office
(please attach)
Previous Exp. Date: 6/30/94 Treatment Plant Class:
Classification changes within three miles:
No chanee o N iz zz lqb
o ppltcat PLO,
Requested by: Ran y Kepler 1C' Date: 1/27/94
Prepared by: _ 1 Date: s/ Z.,(Jy
Reviewed by: ��o, iYlia Date: 5 a7 riV
aoD _A
Wg�ti LEA) -
Modeler
Date Rec.
#
J n1
t
2
Drainage Area (mi ) o. o z Avg. Streamflow (cfs): o• o z
7Q10 (cfs) p. p Winter 7QI0 (cfs)y. n 30Q2 (cfs) o. o
Toxicity Limits: IWC % cut hronic
Monthly Avgerage Daily Maximum Frequency
Flow (MGD)
variable variable
Oil and Grease ft/I):
45 2/month
pH (SU):
6-9 2/month
TSS (mg/1):
45 2/month
Tubidity - (NTU)
50 2/month
Benzene (µg/I):
1.19 24nortth
Toluene (µg/l):
11 2/rrtarh
Xylene (µg/I):
monitor on same schedule as whole effluent toxicity test
MTBE (µg/I):
monitor on same schedule as whole effluent toxicity test
Ethylbenzene (µg/1):
monitor on same schedule as whole effluent toxicity test
Lead (µWl):
25 2#00
Phenol (µg/I):
1.0 2/ntorm
'The discharge shall not cause the turbidity of the recieving water to exceed 50
NTU. If the turbidity exceeds these levels due to natural background conditions,
the discharge level cannot cause any increase in the turbidity in the recieving
water.
There shall be no dicharge of floating solids or visible foam in other than trace
amounts.
All volumes of wastewater leaving the facility must be monitored. If continuous
monitoring is not feasible, then the discharger shall record the approximate times
that discharge began and ended, along with the instantaneous flow at the time of
effluent sampling. Analysis for Benzene, Toluene, and Xylene should be
accomplished using an EPA approved method to a detection level of at least 1
ppb. Also recommend monitoring for methyl tart -butyl ether (MTBE) and Ethyl
benzene should be accomplished using an EPA approved method. This
monitoring should be performed at the same time that the whole effluent toxicity
lest sample is taken annually. Limited parameters should be monitored twice per
month. A reopener clause should be placed in the permit to allow limits to be
placed on toxicants should the facility fail its whole effluent toxicity test.

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
FACT SHEET FOR WASTELOAD ALLOCATION
Request # N7728
CITGO Petroleum Corp - Paw Creek TermfiW7RO` DEPTNAI . of
NCO021962 NATURAL RESppRCCS
Industrial - 100%
Existing MAY 9Renwal 1994
unnamed tributary to Gum Branch WYISION OF FNVIRONN(NFg1
WS - IV
03-08-34
I`R"R'Sit1[ ^;.,
ZQ'UNAL
Hq,yggF�ENi
OffICE
Mecklenburg
Stream Characteristic:
Mooresville,l
USGS #
02.1429.1-345
Kepler
Date:
1989
1/31/94
Drainage Area (mi2):
0.02
F15SW
Summer 7Q10 (cfs):
0.0
Winter 7Q10 (cfs):
0.0
Average Flow (cfs):
0.02
30Q2 (cfs):
0.0
IWC (%):
100 %
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Note: benzene and toluene limits due to excessive levels in effluent and ethylbenzene and MTBE
monitoring due to current SOP.
Note: Phenol monitoring required due to WS calssification
Turbidity levels excessive..., since this is a zero flow stream, effluent turbidity may well represent
background conditions for comparison. The levels submitted on the DMR's may well represent
violations.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by: -;7a"— ' " - Date: 3 mxy, , i I
Ferrell Keough
Reviewed by
Instream Assessment:
Regional Supervisor:
Permits & Engineerin
RETURN TO TECHNICAL SUPPORT BY: J UN n 3 1994

Rxi�iti
TOXICS/CONVENTIONAL PARAMETERS
Mon. Avg. Daily Max. Frequency
Flow (MGD)
variable variable
Oil and Grease (mg/1):
30 60 2/month
pH (SU):
6-9 2/month
Settleable Solids (mlft
0.1 0.2 2/month
Tubidity * (NTU)
50 2/month
Benzene (µg/l):
monitor on same schedule as whole effluent toxicity test
Toluene (µg/1):
monitor on same schedule as whole effluent toxicity test
Xylene (µg/1):
monitor on same schedule as whole effluent toxicity test
MTBE (µg/1):
nr
Ethylbenzene (µg/1):
nr
Lead (µg/1):
25.0
*The discharge shall not cause the turbidity of the recieving water to exceed 50 NTU. If the turbidity exceeds these
levels due to natural background conditions, the discharge level cannot cause any increase in the turbidity in the
recieving water.
There shall be no dicharge of floating solids or visible foam in other than trace amounts.
Mon. Avg. Daily Max. Frequency WQ/EL
Flow (MGD) variable variable
Oil and Grease (mg/1): 45 2/month
pH (SU): 6-9 2/month
i_...rm. __n i ram -4
Tubidity * (NTU)
50 2/month
Benzene(µg(1):
I-}9—y 1.1� a/fnorAh
Toluene (µg/l):
4--- 11.L) /rooKivn
Xylene (µgft
monitor on same schedule as whole effluent toxicity test
MTBE (µg/1):
monitor on same schedule as whole effluent toxicity test
Ethylbenzene (µg/1):
monitor on same schedule as whole effluent toxicity test
Lead (µg/1):
25.0 a/ mft V+VA
Phenol (µg/l):
fettiter I.D 2/month
`!55(rA9�I)
-F5 a/rvtvri+h
*The discharge shall not cause the turbidity of the recieving water to exceed 50 NTU. If the turbidity exceeds these
levels due to natural background conditions, the discharge level cannot cause any increase in the turbidity in the
recieving water.
There shall be no dicharge of floating solids or visible foam in other than trace amounts.
Type of Toxicity Test: Acute / Fathead 24 hr
Monitoring Schedule: Annual
Instream Monitoring nr
Upstream Location
Downstream Location
_x_ Parameter(s) are water quality limited. For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
OR
No parameters are water quality limited, but this discharge may affect future allocations.

MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
All volumes of wastewater leaving the facility must be monitored. If continuous monitoring is not feasible, then the ( y
discharger shall record the approximate times that discharge began and ended, along with the instantaneous flow at the \l°
time of effluent sampling. Analysis for Benzene, Toluene, and Xylene should be accomplished using an EPA approved ,60U
method to a detection level of at least 1 ppb. Also recommend monitoring for methyl tert-butyl ether (MTBE) and Ethyl
benzene should be accomplished using an EPA approved method. This monitoring should be performed at the same time
that the whole effluent toxicity test sample is taken annually. A reopener clause should be placed in the permit to allow .aT Ab
limits to be placed on toxicants should the facility fail its whole effluent toxicity test.
Explain exact pathway of discharge ( i.e. storm sewer to tributary, etc.)
Additional Information attached? (Y or N) If yes, explain with attachments.

Facility Name CITGO Petroleum Corporation Permit # NCO021962 Pipe # 001
ACUTE TOXICITY MONITORING (ANNUAL)
The pemmittee shall conduct annual toxicity tests using protocols defined as definitive in E.P.A.
Document 600/4-85/013 entitled "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, using effluent collected as a single grab sample. Effluent samples for self -
monitoring purposes must be obtained below all waste treatment. The per mittee will conduct one
test annually, with the annual period beginning in January of the calendar year of the effective date
of the permit. The annual test requirement must be performed and reported by June 30. If no
discharge occurs by June 30, notification will be made to the Division by this date. Toxicity
testing will be performed on the next discharge event for the annual test requirement.
The parameter code for this test is TAE6C. All toxicity testing results required as part of this
permit condition will be entered on the Effluent Discharge Form (MR-1) for the month in which it
was performed, using the appropriate parameter code. Additionally, DEM Form AT-1 (original) is
to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Rd.
Raleigh, N.C. 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data. Total residual
chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should any test data from either these monitoring requirements or tests performed by the North
Carolina Division of Environmental Management 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.
Failure to submit suitable test results will constitute noncompliance with monitoring requirements.
7Q10 0.0 cfs
Permitted Flow n/a MGD Recommended by:
IWC 100 % �__�
Basin & Sub -basin 03-08-34
Receiving Stream ut Gum Branch
County Mecklenburg Date s aoor, MLi
i
AAM Fathead 24 Version 10191

Facility Name:
Permit Number:
Engineer:
Subbasin:
Receiving Stream:
USGS quad #:
Request Number:
Date:
Expiration date:
Existing WLAchocked:
Staff Report:
Topo checked:
USGS Flows confirmed:
PIRF / APAMS:
IWC Spreadsheet:
Stream Classification:
Nutrient Sensitivity:
Instream Data:
CITGO Petroleum Corporation - Paw Creek Terminal
NCO021962
Kepler
03-08-34
unnamed tributary to Gum Branch
F15SW
7728
1/31/94
6/30/94
nr
nr
x WS IV
Brief of WLA Analysis
Previous WLA's
1984: Oil & Grease 30 / 60 mg/l (monthly / daily), pH 6 - 8.5 SU
1989: Oil & Grease 30 / 60 (monthly / daily) mg/I, Settleable Solids 0.1 / 0.2 (monthly / daily) ml/L, pH 6 - 9 SU,
Turbidity 50 NTU, Lead 25 µg/I (daily max) Episodic Toxicity Test, monitor benzene, toluene, xylene.
Toxicity Tests
Four of the five Episodic tests have been completed. Three of the four have had >90 % LC50 (tow of the tests were
>100 %). The 1993 test had an effluent LC50 which was toxic at 31 %. The fifth test will be required as an annual
requirement.
DMR's
Turbidity often exceeding 50 NTU. Since this is a zero flow stream, this may constitute a violation, no up and downstream
monitoring was performed to assess this against.
Lead limit (25 jag/I) violation February, 1993
ik?(%Wol mosir" W,11 bs grrerd dam. 4 WS
Parameter Quantity Detected
Month comments...
Benzene 180 µg/I
5 / 26 / 93 standard 1.19 µg/I [WS classification]
< 10 µg/I
6 / 17 / 92
3 / 1 / 91
16 µg/I
Toluene 500 µg/1
5 / 26 / 93 standard 11 µgR [WS classification]
<10µg/I
6/17/92
20 µg/I
3 / 1 / 91
Xylene 690µg/I 5/16/92 no standard: monitor
<10µg/l 3/1/91
13 µg/I
Staff Report
Facility has applied for further treatment capabilities
Region has requested limits for benzene and toluene
ppCA-�rrlL
we 5 %0, "Cax Z6,71 ff"n, r-w1kVj.US �)L�
7AA30 Cc- I 1 FLLIJla LIF kf& LC-60
-TAP 3D IDAPk'Jm Pvkcx

ew lueB�elsp l0 9lunowe etiss .,ele.xeiseM Wal,e4eW Rn B lulsutilui A"oa �M1+ej �� lu wary "`°!i D w�iwr�i. u sue :uo! a a4 of q (!Z)
:seu °W a 8e luenlNa �eroeil Weol Pelld �o �e LB Wuquei �p o�N! d�7 Y yNrl.NolMM (sU
...._� .._ ..._.�9!++ew °dle4on-uq,a�i�......._._ .eBpnP Bvue�eMM�stsewswB�!,YI.�jMYI II
op -As 6uryly!powl
0
W '
_ HPce_vA-SwTv� /�ctvzc-
- // "r nn .
lU %Gv0 40-y� lee I-,/JQ�--
OC Ke��
/A
2

M
I I/ � l t ' = PJeP��IS Z961Z000N � = a S30dN
o c4 c.. -_--
2 2 40 le sl-1 co r-Ji ._ %LJ

pm-
e N 021962 Standard = 11 I /I
Ow MGD
7QIOs cfs =
i 0
nI
BDL=1/2DL
Actual Data
RESULTS
IWC M _
' 100.00
1
0.5
<1.0
Std Dev.
1.526408937
2
0.5
<1.0
Mean
1.05
3
0.5
<1.0
C.V.
1.44745675
4
0.5
<1.0
5
0.5
<1.0
6
0.5
<1.0
Mutt Factor =
6.9
7
0.5
<1.0
Max. Value
5.8
8
0.5
<1.0
Max. Pred Cw
40.02
9
1.3
1.3
Allowable Cw
11
10
5.8
5.8
11
0.5
<1.0
12
0.5
<1.0
�acfflly Name=
.._.._. ...............................
C ilgo
Parameter=
..........................
••Benzene,_,_„_„_i
NPDES # =
I NCO021962
Standard =
': 1.191
/I
QwMGD=••
0.017
7010s cfs =
I 0
n
BDL=1/20L
Actual Data
RESULTS
IWC % =
100..0.0
1
0.5
<1.0
Std Dev.
0.548482756
2
0.5
<1.0
Mean
0.67
3
0.5
<1.0
C.V.
0.815312204
4
0.5
<1.0
5
0.5
<1.0
6
0.5
<1.0
Muft Factor =
3.7
7
0.5
<1.0
Max. Value
2.4
8
0.5
<1.0
Max. Pred Cw
8.88
9
0.5
<1.0
Allowable Cw
1.19
10
0.5
<1.0
11
2.4
2.4
12
0.5
<1.0
1
1

/1�1Anua M �Cu.Q,Quv
SOC PRIORITY PROJECT: Yes No X
If Yes, SOC No.
To: Permits and Engineering Unit
Water Quality Section
Attention: Jeanette Powell
Date: March 25, 1996
- NPDES STAFF REPORT AND RECOMMENDATION
County: Mecklenburg
Permit No. NCO021962
PART I - GENERAL INFORMATION
1. Facility and Address: CITGO Petroleum Corporation
P.O. Box 58
Paw Creek, NC 28130
2. Date of Investigation: March 20, 1996
3. Report Prepared By: Todd St. John
4. Persons Contacted and Telephone Number: Mr. Jim Utke [phone]
5. Directions to Site: The terminal is located at the intersection of Tom Sadler Road, Mount
Holly Road, and Kenstead Circle in the Paw Creek Community.
6. Discharge Point(s). List for all discharge points: Both the treated storm water discharge (out
fall 001) and the groundwater remediation discharge (outfall 002) are located approximately
10 feet from each other. Therefore, the discharge points have the same coordinates.
Latitude: 35' 16' 52" Longitude: 80' 56' 02"
Attach a U.S.G.S. map extract and indicate treatment facility site and discharge point on
map.
U.S.G.S. Quad No.: F15SW U.S.G.S. Name: Mountain Island Lake, NC
7. Site size and expansion are consistent with application? N/A
8. Topography (relationship to flood plain included): Flat to moderate slopes; this facility is
not located in a flood plain.

9. Location of nearest dwelling: None within 500 feet.
10. Receiving stream or affected surface waters: UT to Gum Branch
a. Classification: WS-IV
b. River Basin and Subbasin No.: 030834
C. Describe receiving stream features and pertinent downstream uses: General Class C
uses downstream. A water supply intake is located on Lake Wylie.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater to be permitted: 0.017 MGD (Ultimate Design Capacity) for
the storm water treatment facilities and 0.0432 MGD for the groundwater
remediation facilities.
b. What is the current permitted capacity of the wastewater treatment facility? None
C. Actual treatment capacity of the current facility (current design capacity)? 0.017
MGD
d. Date(s) and construction activities allowed by previous Authorizations to Construct
issued in the previous two years: An A to C was issued March 4, 1994, for the
addition of the air stripping equipment.
e. Please provide a description of existing or substantially constructed wastewater
treatment facilities: The facilities covered by this permit consist of an oil/water
separator, an equalization tank, a second oil/water separator, an air stripper, and
carbon cartridge filtration. The facilities covered by Certificate of Coverage
NCGIO090 consist of an oil/water separator, two air strippers, and carbon filtration.
f. Please provide a description of proposed wastewater treatment facilities: N/A
g. Possible toxic impacts to surface waters: Constituents of petroleum products are
toxic.
h. Pretreatment Program (POTWs only): N/A
2. Residuals handling and utilization/disposal scheme: All residuals and product are collected
by Industrial Water Services for recycling/disposal.
Page 2

3. Treatment plant classification (attach completed rating sheet): Class I
4. SIC Code(s): 5171
Wastewater Code(s) of actual wastewater, not particular facilities, i.e., non -contact cooling
water discharge from a metal plating company would be 14, not 56.
Primary: 39 Secondary: 73
Main Treatment Unit Code: 53007
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant Funds or are any public monies
involved (municipals only)? N/A
2. Special monitoring or limitations (including toxicity) requests: Permit should include limits
for benzene and toluene, etc.
3. Important SOC, JOC or Compliance Schedule dates: (please indicate) N/A
4. Alternative Analysis Evaluation: Has the facility evaluated all of the non -discharge options
available. Please provide regional perspective for each option evaluated. N/A renewal only
5. Other Special Items: N/A
PART IV - EVALUATION AND RECOMMENDATIONS
Citgo Petroleum Corporation has applied for renewal of its NPDES pen -nit to discharge
treated storm water at the petroleum terminal at Paw Creek. This same site also has groundwater
remediation facilities covered under NCG10090. Other than the differing monitoring requirements
for each system, there are no reasons that these permits should not be combined.
Page 3

This facility appears to be well run and maintained. The only problem noted was a small leak
in the connection leading to the groundwater outfall which was producing a small amount of
standing water inside the groundwater remediation equipment building. Citgo seemed very
concerned over the possibility of MTBE limits being added to the permit requirements. Citgo
expressed an interest to have input into the establishment of any MTBE limits.
This Office recommends renewing the NPDES permit. This Office also recommends
combining the storm water and groundwater remediation discharges under one permit with differing
monitoring requirements for each outfall.
Signature of Report Preparer
Water Quality Regional Supervisor
? sA96--
Date
Page 4