NC0004839_Wasteload Allocation_19910520

NPDES DOCYHEOIT $CANNINO COVER SHEET
NC0004839
NPDES Permit:
Document Type:
Permit Issuance
Wasteload Allocation,,.)
Authorization to Construct (AtC)
Permit Modification
Speculative Limits
Correspondence
Instream Assessment
(67B)
Environmental Assessment (EA)
Permit
History
Document Date:
May 20, 1991
Mist document printed on reuse paper - ignore any
content on the reirerse wide

NPDES WASTE LOAD ALLOCATION
PERMIT Na: NC0004839 — — Oa2-
PERMI ITTEE NAME: Exxon Company, U. S. A. / Charlotte
Facility Status: Existing
Permit Status: Renewal
Major Minor
Pipe No.: 002
Design Capacity: 0.0288 MGD
Domestic (% of Flow): 0 %
Industrial (% of Flow): 100 %
Comments:
Permit was put on hold to include groundwater remediation. Outfall
001 has been received (WLA done by Betsy Johnson) See attached
information on wastewater.
RECEIVING STREAM:
Class: C
an unnamed tributary to Long Creek
Sub -Basin: 03-08-34
Reference USGS Quad: F 15 SW (please attach)
County: Mecklenburg
Regional Office: Mooresville Regional Office
Previous Exp. Date: 5/31/90 Treatment Plant Class:
Classification changes within three miles:
none
LOTTED
Requested by: Rosanne Barona
Prepared by:
Reviewed by: f ' u/t'& s4Li v -
-1O t u t\M
w
3/21/91
Date:
Date:
Date:
Modeler
Date Rec.
#
xKA
317:2-15 t
6 I d- s
DrainageSAArea (m. ) G t;
Avg. Streamflow (cfs): 0
7Q10 (cfs) p Winter 7Q10 (cfs)
30Q2 (cfs) t�
Toxicity Limits: IWC 91 % Acut
Instream Monitoring:
Parameters
Upstream Location
Downstream Location
Recommended Limits
** Wasteflow (MGD):
Oil & Grease (mg/1):
pH (SU):
Benzene (ug/1) :
Toluene (ug/1) :
l'Ethylbenzene (ug/1):
$ m/p-Xylene (ug/1) • TIE FAuLITI PA µoNIToP-
o-Xylene (ug/1):j-NIS As TOTAL MENE
Isopropyl ether (ug/1):
MTBE (ug/1):
Naphthalene (ug/1):
2-Methylnaphthalene (ug/1):
Monthly Average
Summer/Winter
0.0288
30
Toxicity: Chronic Q P/F at 99%
Daily Maximum ,
60
6-9
71.4
11
325
MONITOR
MONITOR
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P.O. BOX 4415«-HOUSTON, TEXAS
MARKETING DEPARTMENT
REAL ESTATE & ENGINEERING
ENVIRONMENTAL ENGINEERING
P. B. SNYDER
ENGINEER
aYV. 041..
77210-4415
Mr. M. Dale 0vercash, P.E.
Supervisor, NPDES Permits
Division of Environmental Management
512 North Salisbury Street
Raleigh, North Carolina 27611-7687
Dear Mr. Over
ash:
January 2, 1990
NPDES Permit Renewal
Permit No. NC0004839
Exxon Terminal, Charlott,b, N.C.
.)AN u 1891
p.'Rh1CfC �, it:� i•'•i; ��::^
As indicated In my December 4, 1990, letter to you, the following information
is being provided in response to your letter of November 5, 1990.
1) Laboratory analysis* indicates the following petroleum constituent
concentrations in the local groundwater;
Benzene 4400 ug/1
Toluene 13000 ug/1
Ethylbenzene 4200 ug/l
M/P-Xylene 6300 ug/1
O-Xylene 5900 ug/1
Isopropyl Ether 1728 ug/1
MTBE 11 ug/1
Naphthalene 710 ug/1
2-Methylnaphthalene 690 ug/1
* Please note that the above concentrations reflect the maximum
concentrations found in groundwater at or adjacent to the Exxon
facility, and should be considered only a "worse case" scenario.
2) The proposed groundwater treatment system consists of an oil/water
seperlator, packed column stripping tower, and effluent weir. The
estimated flow through the treatment system is 20 gallons per
A DIVISION OF EXXON CORPORATION

Mr. M. Dale 0vercash
-2- January 2, 1990
minute. The preliminary design assumes a removal efficiency of 95
percent for the aromatics benzene, ethylbenzene, toluene, and
xyle es. A removal efficiency of 75 percent is assumed for the more
soluile compounds, isopropyl ether, MTBE, naphthalene and
2-methylnaphthalene. After treatment, the water will be discharged
from outfall 002, located adjacent to outfall 001. The attached
diag am represents the proposed system.
3) Give h the previously described removal efficiencies, the following
petroleum constituent concentrations may be expected in the outfall
002 ischarge;
Benzene 220 ug/1
Toluene 650 ug/1
Ethylbenzene 210 ug/1
M/P Xylene 315 ug/1
0-Xylene 295 ug/1
Lsopropyl Ether 432 ug/1
MTBE 3 ug/1
Naphthalene 178 ug/1
2-methylnaphthalene 173 ug/1
4) Wastewater Flow Diagram:
Facility Stormwater
Drains
Pumped
Groundwater,
0rl/Water
Separator
0il/Water
Separator
Air
,Stripper
0utfall
001
Outfall
002 ,
5) 0utf11 002 will discharge into the same stream as outfall 001.
The discharge point will be in the same area as the existing
discharge, and both outfalls may be sampled individually. Attached,
please find a topographic map of the area, indicating the location of
outfalls 001 and 002.
Should you ne d additional information on this project before a renewed NPDES
permit can be completed, please contact me at [phone].
Si ncerely,
-rad -n -A-74/4-
PBS
4352D
Attachments
OVERNIGHT

OFF -GAS (TO TREATMENT
IF REQUIRED)
t
t
AIR
SUPPLEMENTAL
ie LIFT PUMP*
Su.% p
061-
��I I ecv.tor
!
4110.11
>0
•
411.111.1
GROUND WATER
RECOVERY WELL
PACKED COLUMN
STRIPPING TOWER
WATER
o)
III -II
AIR BLOWER
• SUPPLEMENTAL LIFT PUMP MAY BE
REQUIRED, DEPENDING OH HEIGHT OF TOWER.
u
EFFLUENT WEIR
(FLOW MEASUREMENT AHD
EFFLUENT SAMPLING)
OUT FRILL
ooz
11134 ER ENGINEERING,
SCIENCE. AND
TECHNOLOGY, INC.
DRAWN
JKS
DATE
7/12/90
REVIEWED
AMH
DRAWING NO.
TREAT 1
FIGURE 4. DISSOLVED CONSTITUENT REMEDIATION SYSTEM
AT EXXON BULK DISTRIBUTION TERMINAL/ 6800 FREEDOM DRIVE
CHARLOTTE, NORTH CAROLINA

90%
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-1-
Facility Name
NPDES No.
Type of Waste
Facility Status
Permit Status
Receiving Stream
Stream
Subbasin
County
Regional Office
Requester
Date of Request
Topo Quad
FACT SHEET FOR WASTELOAD ALLOCATIONS
:EXXON USA/Charlotte
:NC0004839 — Oo 2%
:100% Industrial
:Existing
:Renewal
:UT Long Creek
Classification:C
:030834
: MRO:Meck(A) {{yynrg
:R. Baroh--����1a
:3/21/91
:F15SW
Request # 6148
/fQRES'?uRCE
.. ; SECTION E
AY�E�91
HEALTH ANDENVIRON;,.ENT
NATURAL RESOURCES
Stream Characteristics:
USGS # Date
Drainage Area: 0.01 sq.mi.
Summer 7Q10: 0.0 cfs
Winter 7Q10: 0.0 cfs
Average Flow: 0.0 cfs
30Q2: cfs
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
1
Exxon currently has a permit (outfall 001) for a storm water discharge.
Outfall 002 is a groundwater remediation project for various fuels which
have contaminated the groundwater around the area. The 1990 staff report
states that unleaded fuels, kerosene, No. 2 heating oil and diesel fuels I4jy
are stored at Exxon.
Standard operating procedures for groundwater remediation projects mill
be applied. The proposed treatment is oil/water separator and an air
stripper. ki
Special Scheduled Requirements and additional comments from Reviewers:
Recommended by: J
Reviewed by
I
Instream Assessment: /ALL x N(r`,�Q tG)-y"-
Regional Supervisor: lam,
Permits & Engineering:
RETURN TO TECHNICAL SERVICES BY:
MAY 31 1991
Date: 5/1/fi1
Date: 6 a f�J i
Date: 5-j%/�/
Date: 5Ast
1991

• 1 r
-2-
CONVENTIONAL PARAMETERS
Existing Limits NONE FOR OUTFALL 002
Recommended Limits
** Wasteflow (MGD):
Oil & Grease (mg/1):
pH (SU) :
Benzene
* Toluene
Ethylbenzene
m/p Xylene
o-Xylene
Isopropyl ether (ug/1):
MTBE (ug/1) :
Naphthalene (ug/1) :
2-Methylnap thalene (ug/1):
Toxicity: Chronic Q P/F at 99%
Monthly Average Daily Maximum Freq
Summer/Winter
0.0288
30 60 2/mon
6-9 2/mon
(ug/l) : 71.4 qtrly
(ug/1) : 11 qtrly
(ug/1): 325 qtrly
(ug/1) : TaE FAt tt,tTV MA`I £oNIToa- MONITOR qtrly
(ug/1) :J AS T°TAL PILE -NE- MONITOR qtrly
MONITOR qtrly
MONITOR qtrly
MONITOR qtrly
MONITOR qtrly
ORGANICS TESTING MUST COINCIDE WITH TOXICITY TESTING.
Twass CaMPatNOS (RCP' S/ Toc.ur.JE) 'Einyl 8CWZEMBI j�Yttiv¢) Sccoctt D $+�
4N eP 4107HvD To Pt brT Ttonl (girt OF i (p.
INSTREAM MONITORING REQUIRMENTS: NONE
Upstream: Location:
Donwstream: Location:
hum tTo4ED uS(NCB

e
• using test pr
10/89
Facility Name tXX.o4 UsA Cili(L o Pcnnit t *DOD+BSc)
arrFA t. t. ooZ
CHRONIC TOXICITY TESTING REQUIREMENT (QRTIZLY)
The effluent d ischarge shall at no time exhibit chronic toxicity in any two consecutive toxicity tests,
ures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic
Bioassay Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or
significant mortality is 9% (defined as treatment two in the North Carolina procedure
document). a permit holder shall perform quarterly monitoring using this procedure to establish
compliance' ;le
the permit condition. The. fast test will be performed after thirty days from
issuance of this. permitduring the months of Amy Ai14, Noll, .Feet . Effluent
sampling for this testing shall be performed at the hPD permitted final effluent discharge below
all treatment rooesses.
g
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the month in which it was performed, using the parameter
code.IGP3B. Additionally, DEM Form AT-1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
P.O. Box 27687
Raleigh, N.C. 27611
Test data shall be complete and accurate and include all supporting chemical/physical measurements
performed in. sociation 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 o;] the ,waste strewn.
Should any s' le quarterly monitoring indicate a failure to meet specified limits, then monthly
monitoring begin immediately until such time that a single test is passed. Upon passing, this
monthly test requirement will revert to qu -terly in the months specified above.
Should any test data from this rconitoring.requirement 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: Failur 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 retesting(within 30 days of initial monitoring event). Failure to submit
suitable test results will constitute noncompliance with monitoring requirements.
7Q10 0.0 cfs '
Permuted Flow b, o ZZ$ i cGD.
IWC% goo. o0
Basin & Sub-bsin 030834
Receiving Stream LIT L.oNe� Cstoc.
County Mai-ttae.uie
Rccommended.by:
thm4,
Dare ivvou
**Chronic Toxicity (Ceriodaphnia) P/Fat 11 'Io, MAI,FfiSt See Rt _11J., Condition
4