NC0073181_Staff Report_19960213

SOC PRIORITY PROJECT: No
To: Permits and Engineering Unit
Water Quality Section
Attention: Paul Clark
(Review Engineer)
Date: February 13, 1996
NPDES STAFF REPORT AND RECOMMENDATION
County: New Hanover
Permit No. NC0073181
PART I - GENERAL INFORMATION
1. Facility and Address: EXXON Chemical Company
South Wilmington Terminal
Post Office Box 1350
3340 River Road
Wilmington, N.C. 28403
Corporate Environmental Affairs Office: Paktank Corporation
2000 W. Loop South
Suite 2200
Houston, Texas 77027
ATTN: Jim DuBose
2. Date of Investigation: January 25, 1996
3. Report Prepared by: Jim Bushardt
4. Person Contacted and Telephone Number:
Alfred Smeilus, Paul Marlow [phone]
5. Directions to Site: The facility is located in Wilmington at
3340 River Road.
6. Discharge Point:
Latitude: 34010/43/, Longitude: 78057/16/1
U.S.G.S. Quad No: K27NW USGS Quad Name: Wilmington, N.C.
7. Site size and expansion area consistent with application ?
Application does not refer to site size or expansion area.

8. Topography: The site slopes downward approximately 30 feet
toward the river and the oil/water separators are considered
to be located out of the 100 year flood plain.
9. Location of nearest dwelling: The closest dwelling is located
approximately 1/2 mile southeast of the facility.
10. Receiving stream or affected surface waters: Cape Fear River
a. Classification: Class "SC" waters
b. River Basin and Subbasin No.: 03 06 17
C. Describe receiving stream features and pertinent
downstream uses: Commercial shipping, boating,
fishing, and hunting.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Pertinent Information
a. Volume of wastewater to be permitted: Variable,
depending on precipitation events.
b. what is the current permitted capacity of the wastewater
treatment facility? No flow limit specified.
C. Actual treatment capacity of the current facility
(current design capacity)? Unknown
d. Dates and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years: No A to C's have been requested within the past
two years.
e. Please provide a description of existing or substantially
constructed wastewater treatment facilities: Gravity
oil/water separators to 2.5 acre unlined lagoon to
discharge weir and valved effluent conduit (for staged
release).
f. Please provide a description of proposed wastewater
treatment facilities: Not applicable
g. Possible toxic impacts to surface waters: Dissolved
petroleum constituents.
h. Pretreatment Program: Not a POTW
2. Residuals handling and utilization/disposal scheme:
There is no sludge produced on the site. The floatable pmd3ct
is stored within an interface tank and is periodically sold.
3. Treatment plant classification: Class 1 facility

4. SIC Code: 5171
Wastewater Code: Primary: 39 Secondary: 16, 66
Main Treatment Unit Code: 53500
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any public monies involved? Not applicable
2. Special monitoring or limitations requests: None
3. Important SOC, JOC or Compliance Schedule dates: None
4. Alternative Analysis Evaluation: Has the facility evaluated
all of the non -discharge options available? Please provide
regional perspective for each option evaluated.
Spray Irrigation: Sandy soils are prevalent in the area.
Sufficient area is probably available. The site has several
petroleum contaminated groundwater plumes which could cause
problems in the monitoring activity.
Connection to Regional Sewer System: The POTW will not take
treated waste into the collection system unless the discharge
is within an environmentally sensitive area. This portion of
the river exhibits a large flow volume, contains many
discharge points, is classified as I'SC" waters and is not
considered to be environmentally sensitive.
Subsurface: This option may not be feasible, due to
interference with contaminated groundwater plumes which exist.
5. Other Special Items: None
PART IV - EVALUATION AND RECOMMMATIONS
This report is being prepared due to a permit renewal request.
The EXXON South Wilmington Terminal receives hydrocarbon solvents
from tanker ships. The products are stored in metal tanks of
various design and dispensed to tanker trucks. The products in the
current inventory are mainly light clear liquids and include
toluene, aromatic-100, varsol-1, exxsol D-80 (an aliphatic
hydrocarbon) , exxsol D-40 (an aliphatic hydrocarbon) , aromatic-100,
xylene, 2429 naphtha, paraxylene and isopar-M. The waste streams at
this site include stormwater flows from containment areas
(estimated at 20.7 cfs peak flow), and tank condensate drainage.
Due to the current inventory of products and type of tanks used,
tank condensate drainage is not currently performed. Terminal
supply lines are flushed with water prior to product changes and
wastewater is removed to the interface tank for future disposal.

The 2.5 acre pond does not discharge through the effluent
piping on a routine basis. There is very little effluent water
quality history available for this facility (low BTEX
concentrations and passed toxicity test in 1991) due to this
reason. The pond is located along the river and is separated by an
earthened dike. The writer assumes that the pond water level is
effected by the river and that subsurface flow allows percolation
of water through the dike and into the river during low tide events
or during periods of high pond levels. The river displays a high
flow volume and velocity adjacent to the pond. Ambient water
quality samples of the river at this point would probably indicated
normal water quality due to the dilution and mixing action. The
pond has three groundwater monitoring wells located on the dike
along the pond perimeter. Research into available groundwater files
to determine the quality of groundwater in the monitoring wells
showed that groundwater standards were not being violated. This
data is somewhat limited and was taken from a 1991 report. The pond
displayed patchy light sheens on the surface during the site
inspection. There was a continuous flow of apparent infiltrated
groundwater entering the pond via gravity wastewater piping which
the writer thinks contributed to the sheens. The pond should allow
volatilization of separated residuals. Groundwater remediation
activities are being performed on the site (0.144 MGD) per
Nondischarge Permit No. WQ0008129.
There are two boilers located at the facility. The boiler
treatment chemicals used at this site include Ancotreat 1300, 2000,
1240, and 1000. Ancotreat 1300 is an aqueous solution comprised of
organophosphate and synthetic polymers. Ancotreat 2000 is an
aqueous solution comprised of morpholine. Ancotreat 1240 is an
aqueous solution comprised of sodium polyphosphate and synthetic
polymers. Ancotreat is a powder comprised of catalyzed sodium
sulfite.
The monitoring requirements appear to be reasonable. However,
if the hydrocarbon solvents at this site can be monitored in a more
simplistic and effective manner, the Region would recommend that
action.
It is recommended that NPDES Permit No. N00073181 be prepared
and placed at public notice. If no significant adverse public
comment is received, it is recommended that NPDES permit NC0073181
be reissued to the EXXON Chemical Company -South Wilmington Terminal
in accordance with the basinwide permitting strategy.
nature of report preparer Date
er Quality Regional Supervisor Date
JB:EXXON.296
cc: Wilmington Office Files
Central Files
Technical Support Branch

`^ LL ' - f •v 1 _ /- :� ! � .�K.,.._ �r - �+ _� '! �r1iiAD+a:^ ,r;---.•r�., .=i i.
knz
gym , , , y •1 Y ���,
10
�, R11i C /(c)' i N ��,1 1
„� • \ '•?I: 1 . 4 �.! two... � � 1� � �' t \ lii t. � Y
'•t•, . ..`".,..:1,` :ia'%17:r>.': y �� ' , f J -. ' a t'�. 1 . ^�; P�
ufT ✓1. �.w • t '+�3 1`
.ate � 1. ' • •- ::. •� - � ���,��CT,:•-, ���` ! 'ir; . •' . r� � i �C• G'C� •^^. "•.�,,}� 'd,•%" .. v%�
�'%+• �,� • �"• !,`'_! tz.• : �� - U�� I .l+a-`Q i5� �.•t ''�y�
..: `y '. � � ,.,.... -:f+ � n.. •.. �J 1 .n'J�,31v_�{'•,;JC�4ti�'= � '{� �,�£" r. � Y4„` "�''•� 11 .�'. •,�
'••' v� •.,.\ `f"�3 y` .j` .. �:,;4: . � 1 :��.tw�`�.•'��,j�• '• ayyV-T.��•1�,#y��, �n ' f� r ��•Y •� F/' -•
1 �• is _^ ' � �' +• t �ucK c „ . �:. o ,�
[�" •� �� :::Kt�• q• ` i �'• ... fi� 'r � � 1 �,,,�� 1.. Si !�,� s. o-i1!r tO 1r \
;1 �' : � �• ::i. �, :r7:, � ;.. � 1 Itii t �J4 -'��� •..a �' .►tr..�.R'R'�' s:,L. `6 �
F1 . «1• � Y.'_ 4-, ,Y•; ♦.•r ;.. f (ram •4r.� 1 � �4- r "�' \ • a� •.`• ,N�.
:, • "�� i i• :-•• i:. Q ( �!' •� TO E.B " j� ~ ;. Q='J` i awe•
r
.�.•: • �"� .::. • a •�i',,•' T ' '; ` `tat. 4 tir LIGFITO � "'' ' • � j .•a- •^ ;'' It�L. � ""�
\.: :.'•M "jYZLS•.�'•''w.%s• �. - a' ' w. I '� I ��1, q
;t+�i • � Y:•.• ,jam.- � �� Q J'• ;'w'- •..-.5:: r1' , '��• �ti_ a.... ���'
r�1• .r F , •• , t: � .S �,.� N • .. . J t. ± 4 � 17 •r ♦. � � • ,• - .,r•,�, i�� � '.•"tfr.:
•,v,� Mrr,�.yT -i r '� •�" ,',•'n � �' :.� i:,\t :"° '.Y•• - ! j' '+ ... -` -•.�.. .:Qi: •t�r• }�c�_ � _' � ijr �',
u TIN
.000
'•�wr 1' v4�•\ _•• �tr'. ``-%'. \'\M-• 1 !• t •,•.. ! : •t W,'.' '�yt i���ia.�•• r• ��f_
- + t yl� • ' •' r ••y ,,.� ; :iF"' * '` 1 C I l'c9y+ • �' 1t��. -n TA DliI 4 r
•ter' .` . v!... �_ !••w R'�• ` �•_ ` . 1 � • r •` .. _r••. i � n. (-.
•�'• IL •� ~ yI.T t '/ � •• '
07� • •"♦Y _ •'r' ':� / : •y "f�• �•},t,) •W-• �Y1
�'} �L •' wry \ _ a \ f •t t' •... , ' r .•4
` , 'is r � �}�}k try/- •, 1 '`:.•��1 ', � � `i Q 'r . � Li �' ' s•t • n
•~vim ;�w-S. tr.S y~•7r+.•� �J _.'� �'� �• � '•� � _ ;'?:. � 1 ,y' ..'• ��• •y •liy� �; M•., -.� �`�".
rn
•=Lr� .>` -, • '�•`a••. r; ..,C. s - t 1. !.• /� ,� •' i'•`•�'(, •:' t � 1 ` ." • • �... /�+�� r, �...••'u••,
•fr» •, � a . •I��.�A : �..%i t �A ��.t.- 1� ,� �' .•••t't ••• . 1 � .�y�.' -.Q� ���� / 1.i i _ ►�•1� .!t. i =a!~
od
•''' ••L.w. I -PCB;' � '� r�
V �.• +,• +` i`,TfDAL-FLAT_ i " ` : a: g 1. i.t•
d, •�a e: •1 : . i i L • .�•• {{ 'fir.. �v _ ,} .r•+..+ ��• ' •'i 1 I ►r-� ,r i : � •..• . r � r. •ter : f • �a f ..' j
•���ALLiiii-
,,, .' I �1.. t . . _ Au _ fix•' - '� a';� +� r .+. .••'
t'' •a. t' !:-: ► ..,: Q I III';, l•` `AADI tTO�I`i
i 1: �. �C .k: ��.. �� - t: ■ t ��T
w
. -_ ��• .� . ' r, ,r"®`� _ ,- { ' / � e �t=, � ••' '•�",.''• . '# - ' X:. ry 't-••fix• • = � 1l,, - t a � � �r � .. r`�+rl p�s�,• D::.. ,y nr.L�S � \. r
' • a ' �.c'' �_« -_ -• .r r: TJ 'a S�jt ✓ d � ' +JYf••' :1~ + ~ � _ l�� �,%- � �•, _ .• � '� ��;' ve+'-�• 'r
.;r: y�s y+t :y.�t„ ;�•� 9' r ;�� L a•� _L.+.. � !! I: '_ � � j. VJw''�'.. �=
a... ''r'y►•�Z'J`�Yr•i�'',"` ,•x 1 2�� _, j1•e ar.• A _ .�/ _; I�i;.�. `!+ j i` a •.�..ib' e
' �-y(i- .�,�,'�i}'"�'�£�i ' � i •_ .'• 1- x• LTA � r ��\ � r.• ,♦ ��,
"�"`•'{ � v.r, M .1:-.- ' 'Yn.• is • C_�4 •' 1 .:I: � • . r. +. ��`]• � + �y
_,•".+. y'riy'_a�lyi'�'.'-S.i,V��.� Y?v:, it; ,, ! � � �,wtiM •Y arc r, • b •� 1 /`�.. �'',!„icq \.,t rT% i!t.�•:t• �
\\`` Jirr �. M''+I•ir•-v��r; rrA►�,t• 'r' .�,..i' �•+ ��r i.:•.`1 •vr__ %. % •'� �M+r ::%%��` •-
J� •{ .+►s}!r^'�.�-�t�-7�• �^.:1r �srt�,' �'a » � �w� •---•/ ••f - � +�./ I >•�s1:, .
, r '•�y,�t', '� „Y M�i'r rim �'• •1 :•rb•• + S L �- �: -j�'•' ( _ •••I_. : ••�••, • •'1, -• N�-
•• '.r•7.{.� +„'-.Ra�.h �• �... f'•-Y, t• i ..'�• •i�Cw r. .�� �!•••I er,` � O y• G-' ^ J^' •• I �'-' ••••• :i 'J��:�'�;
-7 �•' •?•�r'...�•w'�yY, �K?.Y�- M:'• •A..•i ' ItT'}•'•�ti. x•�•�r'. t 4 r!• : _ ♦ - �.f' ' •. .
_ r �Ma'M+hft•':-'i/Y+,' ~y'�` 1 COMP
'," IS':',7� ,;.' M!'tK• w�' R r�` •'' �LY..; j `+y..
CAL CO
E� pN CHEMI Np,L
��.. „ a• �X WI N TON TE I o
'� �• �, .,, =,� �` � : SOUTH � T NO. NCO0731S I LrcHr �,5 .. litt .3`' ..::`�'�: , , :.. ` �•'
sar,� NPDES PE ; GTpN NC 4.. . �'. .- �.•, •,. a N:�, • �: ;��.
" -==
AD S'rIEE`�I = WILIi1
QUAD I �Y ^ • • w _ - E�r����r""" jT}s Cj�� v-, t�► ,.
poINT
CRA
.. :,-r.0.� ' -cam-•a R
DISC
r '•'"•a•.�� '.,,,J� '' ���+ ,�•''•,t'' �3ar'F✓- �:^t:'•::�+rv:,.�,....er. a: •.. .'.�-; �•.a., , y _ � •:J .,.i 1: j-ri' � � ^ ��� i n:
,�, s > a.• :�� 1;v �.•'•,+i?•, r'-.. r .; •.'_'� :_ ! n LY y�/�}[ �r j
1 r
', ,•{ r:•:t• �' ,' f` q-•r•!fu•_-•'�^-. 't J}:.r"'iir.'��•�1�' :: ;1I•' .rl +, ,. ' v !'. r'• i ,�•�` a .r/,-+F►y.A'%•' �_0155
� , :s'iT,C; S.•,.+sTj ":F!.«!) ;;.. •„ , .•. ,••.V., ,ba•, n 1 ... :A... » .
M��,�°''y��=d�e•.'r.• r ::....�,,:'• yr �;.. -.� ' .. .y `r' I %li• .:�3,`•,F. ys:e�'�;
y � v {�,L:-',•.: Z`'•i' S,t�•-' r"{( � ? � ! �`' r•i,• 1 "1•" ' clv a `-'A j•r ••, .a5: �.,_y..� ..i •t
!•it� • �,�: ,. r"t�� r �lf,tyt,?� r, •^•♦,�}a+al 9 w I 1 i 'h .,r a• a '�...rl!•' �.p
��r•"�„ S•q•Kl-`� fi`�,•'• �Y's ��,+. ^�• 1:-+ :)n.�( �% �' ;1 •r ,'�' ' '...•• � r . i:yL•+\3�•....•�R).�y�l , �} /• _-__ y, _ .
ff♦',,.: � 4-� • �4'.:L� 4!^~•+'T:l �' ,� - t'� a�,•r _ -: •. ! 'r'r'••. . '�S (. �'L'f" :t•I /L` '~y�/
`j • M •� .:• Itit''�.�t�� �� �r••^•'•e•t-'�a••. VI •„Yw. .•.i "v" }.. •, �' I ,J Q � .. t -'S�.
yc� t4 •�L�.�2� � ram. s.a t., .Sr^j« - • � � 0. '.}� i� .-.pi• •. p•.,e•..F1�'Y �' r--�.
tr ' ! t\ iss. �{'�+ /: �....'%'uy,,,_.;. •i:. c��_.. •''` •b.ya �`' � ^•� • .O �' .+ �/J+ "�-" ••r:
r �( a
.. s_.s ♦. ice»,.-�'.�' .i �,�' i -•�.^ � •.'t. G�{� j: (
0.
'.+p���lfwit<r.:. - �•=?�••vt. '�� �i'+'�`t._: .t '; ...: i•lr. v:.. �+'.: `�. \ �: ` r'�_•'-�•�. y't r �'' �S•' •
,,"�• s~- . a:7•aM'♦;-�"re' `+1?}%�"" r� ✓.•;Y �M:'r v 1�' ; J f \d �:
Sii'• �e�,,,�ti»"'►t7n�„`7Cs'r�'.•.,Je'r �`�"` R ;y�•�'tt ;I.:rry �.'+- .+'� .`-"(y , 41t•,"�` �•�• l L••:.�+�` ;, �� ��; , �•- �t� t �•
..-'�3� �' ";Tr- +� ..�-s+! � ;rt :air!•. J.:.:..._• .,K _ _ � 4...•t,•_,l ,.at � %,r '=.
�••,.•. - ` 1••;►L•!4L:�•.'^ L:'CP. •'�••f, �... ,*- wq::. t �' 1 A �„_. t jl r" � '''••� � _ ,.tl�
) q r:Gttti .':•� ���� �� �••�� '.k :r .r'+" �: � . •�..• .��.,� ' r t ... � 1 ;.' 7 \.\ � A'y� � '� w; � .l•`
3 ..rl ,•.►•i c> ,a..••.f,rC�. , ..:1'� l :v••. :I �Z� w r
•.. �•h� C. �AT"�ga.::' wtp N+ i-t••• ._ r Y'• _�»ttnl .. y ..x'.r %�' � :r
t �'�1a1 :'� �� �},±r,'1i`r.,,J,•,� '~'`"r,♦..'�•r . ' � �- - VM�r rp`��
'•�w�}-fC+±:,l�•• i, �,1.fap(Li't.SI.{ I u"Y l!:`a. ,) _ �t + �k ti.:...�:. �i '�' '+� �P . i :wfa ••' _ :.�y 'tit:' •°-+•� �s. �. •.� ram, �r. �r}M�+ .L r.. �lt• 1. `^ �--;. .--may :•' �; '�- �:t � '!••:j C i U. �A S 1 a -' •y o i+. . ' t i i t O �.l"'�v:� i �t ' ,•...
,•••. ';y �.4. a• %V... •:�m ::.�t ` ', T ..• ,• a + .+ ♦ .• _ " TQWEIS.:'
aw.`3L"•'S " _• • ' ,^x. . i+M
.,.z^- MWi'n.• // • •ri �ih•:V.ar�j '^• � a , � ,�' �a � *, '(i, ,! � 1 • 1 ,, + T. '•.i ••�, .� '.ia..•-�•�yY.�..�, � '+, „�`
`'!}-4-b.i°s'•�'„'�a'Y�.::L�,::•";,r'•,-,j?7c•�'.•L�i:�':�.r'-}��.., ..iF•t .1,. �.+ • •+._.�a. iiew .l "* :tom
.1 r.,ya�•�'�'•.ii , '.'. .,y +•';;(.� :..i1.,a r_ ••`. t !•` •N. K�+••�.a, .p •`�s ` ,+77y�� Y',. ~♦�
0.0
�•� •Z Ss''�ir " i _.. :.�' . ' . LIGHY l >_•: �a,'..•: fit'•"_..
�' xF. ► r = ::= - FLA7"` ' < t IL 114
;�. \Nc ', ,. tom-,.` _ :,�.• ��.1: ' — .' \ O \ `25--°?f><_✓:�`; \ ` •.
±: fir♦= t '� iy;w • •:.. LIGHTIle
-"i�',+ ��.� �\. �• ]c .�
ON
�•`�, + Y �rNi.. t:s• ,� r, t 1 : LIGHT _1�._�('�-`ram-• i�b•� _' J i v ':
t \! LIGHT

RATING SCALE FOR CLASSIFICATION OF WATER POLLUTION CONTROL SYSTEMS
Name of Facility:
Owner or Contact Person:
Mailing Address:
County: _ �G�
Present Classification: New Facility Existing Facility
NPDES Per. No. NC Nondisc. Per. No.WQ Health Dept.Per No.
Rated by: Telephone: _ 3!e --,7900 Date:
Reviewed by: Health Dept. Telephone:
Regional Office Telephone:
Central Office Telephone:
ORC: Grade: Telephone:
Check Classification(s): Subsurf Spray Irrigation Land Application
Wastewater Classification: (Circle One) II III IV Total Points:
SUBSURFACE CLASSIFICATION
(check all units that apply)
1 ` septic tanks
2. pump tanks
3. siphon or pump -dosing systems
4,_sand fitters
5. grease trap/interceptor
6. oil/water separators
7,_gravity subsurface treatment and disposal:
8. pressure subsurface treatment and disposal:
SPRAY IRRIGATION CLASSIFICATION
(check all units that apply)
1.
preliminary treatment (definition no. 32 )
2.
lagoons
3,__septic
tanks
4.
pump tanks
5.
pumps
6,-sand
filters
7,_grease
trap/interceptor
8.
oil/water separators
9,-dislnfection
10.
chemical addition for nutrient/algae control
11.
spray irrigation of wastewater
In addition to the above classifications, pretreatment of wastewater In excess of these components shall
be rated using the point rating system- and will require an operator with an appropriate dual certification.
LAND APPLICATION/RESIDUALS CLASSIFICATION (Applies only to permit holder)
1. Land application of biosolids, residuals or contaminated soils on a designated site.
WASTEWATER TREATMENT FACILITY CLASSIFICATION
The following systems shall be assigned a Class I dassif!cation. Lplagg the flow Is of a significant quantity or the technologes,
unusually
complex require consideration by the Commission on a case -by -case basis: (Check If Appropriate �owS q�i'e WrPnig.
1. Oil/water Separator Systems consisting only of physical separation, pumps and disposal; -�-� t7Qs �!"!h 1`+t' lake
2. Septic Tank/Sand Filter Systems consisting only of septic tanks, dosing apparatus, pumps,sand filters, disinfection
and direct discharge;
3._._Lagoon Systems consisting only of preliminary treatment, lagoons, pumps, disinfection, necessary chemical treatment for
algae or nutrient control, and direct discharge;
4t_Ciosed-loop Recycle Systems;
5,_Groundwater Remediation Systems consisting only of oilfwater separators, pumps, air -stripping, carbon adsorption, disinfection
and disposal;
6,__Aquaculture operations with discharge to surface waters;
7L_Water Plant sludge handling and back -wash water treatment;
8,_Seafood processing consisting of screening and disposal.
9. Single-family discharging systems, with the exception of Aerobic Treatment Units, will be classified If permitted after July 1,
1993 or It upon Inspection by the Division, it is found that the system is not being adequately operated or maintained. Such
systems will be notified of the classification or reclassification by the Commission, In writing.