NCG510215_Complete File - Historical_20171231

SQC PRIORITY PROJECT. Yes— No
If Yes, SOC No.;
To.* Permits and Engineering Limit
Water Quality Section
Attention: Charles Alvera
Date. September 27, 1994
NPDES STAFF REPORT ADD RECOMMENDATION
County: Mecklenburg
Permit No. NCG510215
PART
I - GENERAL INFORMATION
1,
Facility and Address: Conoco, Inc.
Post office Box 4784
Houston, 'Texas 77210-4784`
2.
Bate of Investigation: 06-28-94
.
Report Prepared By:; G. T. Chen
4.
Persons Contacted and Telephone Dumber. Mr. Bruce H. Dalton,
Environmental Engineer, Cooper Environmental, Inc., (704)
845-2000.
.
Directions to Site. From the junction of Wendover
Ro d Eastway Drive and Monroe Road in the City of Charlotte,
travel northwest on Monroe Road approximately 0.70 mile to the
junction with Washburn Avenue. The site is located in the
southeast quadrant of the junction.
6.
Discharge Points)., List for all discharge points.
Latitude. 350 12' 1111 Longitude. 800 48' 01"
Attach a U.S.G.S. map extract and indicate treatment facility
site and discharge point on map..
USES Quad No.. G 15 NE USGS Name. Charlotte East, NC
7.
Site size and expansion are consistent with application?
Yes X No If No, explain:
8.
Topography (relationship to flood plain included). The site
is relatively flat with slopes of 1-3% towards the northwest.
9.
Location of nearest dwelling. Approximately 80 feet from the
proposed site.

1
10. Receiving stream or affected surface waters: Unnamed
tributary to Brier Creek
a. Classification: C
b. River Basin and Subbasin No.: Catawba and 03-08 3
C. Describe receiving stream features and pertinent
downstream uses: The proposed discharge is to a Swale
that enters the storm drain of the City of Charlotte.
The storm sewer is tributary to Brier Creek. Down. -
stream users are unknown.
PART II - DESCRIPTION OF DISCHARGE ? TREATMENT WORKS
. a. Volume of wastewater to be permitted: 0.0072 M D*
(Ultimate Design Capacity) *Rased can pump capacity
(5 gpm).
b. What is the current permitted capacity of the wastewater
treatment facility" N/A. Proposedfacility.
C. Actual treatment capacity of the current facility
(current design capacity)" N/A. Proposed facility.
d. Date(s) and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years:` N/A.
e. Please provide a description of existing or substantially
constructed wastewater treatment facilities: N/A.
f. Please provide a description of proposed wastewater
treatment facilities: The proposed groundwater
remediation facilities consist of a 'x 51x 2'' oil/water
separator, a 2'x 'x 2' diffused aeration tank'(with a
regenerative blower rated at 96 cfm and two 200 pound air
purification canisters), a granulated activated carbon
unit (frith two 200 pound water purification canisters in
series), a number of monitoring wells, and a recovery
well (with a pneumatic total, fluid pump. -rated at 2.
GPM).
g. Possible toxic impacts to surface waters: Tonic impacts
to surface waters should be minimal, provided the
contaminated groundwater is treated adequately prior to
discharging.
h. Pretreatment Program (POTWs only)* /A.
NPD S Permit staff Report
Version 10/9
Page 2

in development: approved:
should be required: not needed:
2. Residuals handling and utilization/disposal scheme: No solids
disposal scheme is available at this time. The applicant
needs to submit a solid waste management plan to DEM for
approval, if solids generation is expected.
a. If residuals are being land applied, please specify DE
Permit No..
Residuals Contractor:
Telephone No.:
b. Residuals stabilization: PSRP.
FRP:'
Other:
C. Landfill:
d. Other disposal/utilization ;scheme (specify).*
3. Treatment plant classification (attach completed rating
sheet) Class I, see attached rating sheet.'
. SIC Codes: 5541
Wastewater Code(s) of actual wastewater, gnot particular
.jG#," U1.L4%C L=M I J. o ems. • , 1&%041 a».. aaw v... •e.:J --.- - .
metal, plating company would be 14, not 56.
Primary: 66 Secondary;
Main "Treatment Unit Cade: 56000
PART III. - OTHER PERTINENT INFORMATION
1.Is this facility being constructed with Construction Gr
Funds or are any public monies involved (municipals onl)
/A»
2. Special monitoring or limitations (including to ici
requests: None.
. Important SQC, daO or Compliance Schedule dates: (ple<
indicate) /A
Date
Submission of Plana and Specifications
NPDES Permit Staff Report
Version 0/9
Page

Begin Construction
Complete Construction
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: Insufficient land area available for
spray irrigation system.
Connection to Regional Sewer System. The Charlotte -
Mecklenburg Utility Department does not accept treated
groundwater to its sanitary sewer system.
subsurface: Insufficient land area, available for a ground
absorption system. Also the site subsurface conditions were
not suitable for an infiltration gallery system.
Other Disposal Options: Not evaluated.
5. Air Quality and/or Groundwater concernsor hazardous waste
utilized at this facility that may impact water quality, air
quality or groundwater? The proposed treatment facility is to
rmedite groundwater that has been contaminated with
petroleum products clue to the leakage of underground storage
tanks. Contaminated groundwater will be recovered and treated
via the proposed facility prior to discharging to a storm
drain in the City of Charlotte. No hazardous materials will
be used at this facility. Impacts, if any, on the environment
should be minimal.
. other Special Items: None.
PART IV; EVALUATION AND RECOMMENDATIONS
Conoco, Inc. requests a General Permit for the discharge of
treated groundwater from a proposed groundwater remediation
facility. Groundwater has been contaminated with petroleum
products clue to the leakage of underground storage tans (six
4,000 gallon storage tanks for leaded and unleaded gasoline, and
kerosene at a gas filling station located at 3301 Monroe Road,
Charlotte. The site is currently vacant). Recovered groundwater
will be treated via a proposed " remediat.on facility which will
consist of an ' oil water separator, an air -stripper, and an
activated carbon adsorption unit prier to discharging to a Swale
that enters Brier Creek via a storm drain. No significant impact
can the environment is expected from the proposed wastewater if the
contaminated groundwater is adequately treated prior to discharging.
NPDES Permit staff Report ,
Version 10/9
Page 4

On -site investigation revealed that the proposed discharge is
to a Swale that enters a storm drain in the City of Charlotte. The
storm drain may be tributary to Brier 'Creek. Since (1) the
discharge is within the North Carolina Department of
Transportation's (NCDOT) -right of easement and (2) the discharge is
to the City's storm sewer, the applicant needs to obtain
permissions in writing from both NCDOT and the City of Charlotte.
Pending final review and concurrence by the SERG, the NCDOT,
and the City of Charlotte, it is recommended that an NPDFS General
Permit be issued.: to the applicant as requested.
signature of Report Preparer
"Water Quality Reg% al Supervisor
Date
NPD S Permit Staff Report
Version 10/9
Page

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Ate. NCer-5-14-V5

DIVISION OF ENVIRONMENTAL NAGS: ENT KQ DBPT. o
Water Xr RESOURCES
Quality
Permits and Engineering Unit
September 22, 1994
DIVISION RE ENVIRR MENTRE MAW&EMEml
To: G.T. Chen, MRO MO RES ILLE RE918ma oFFICE
From: Charles Alvarez,' Environmental Engineer, NPL ES Permits, WC
Subject, Conoco, Inc. Former ,het Store 33009, NCG5102I5, Mecklenburg
County
Attached is the submittal from Cooper Environmental l for
Conoco. No additional information has been received, from the
consultant as of this date.
If you need any more information please call me at 3-5083
et 553

State of North Carolina
Department of Environment,
Health and Natural Resources A V4J*
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
August 25, 1994
Environmental Division
Conoco, Inc.
PO Box 4784
Houston, TX 77210-4784
Subject: Application No. N(
Additional Infonuation Requ
Groundwater Remediation
Former Jet Store 33009
Charlotte
Mecklenburg County
Dear Environmental Division:
The Permits and Engineering Unit has completed a preliminary engineering review of the
application. Cooper Environmental, Inc, is the company that submitted the package to NCDEM, h
no return address was included in the package.
Z�
The following items must be addressed before we can complete our review:
1) A site location map of the remediation equipment in relation to other features at
(such as roads, buildings and wells) with buffer distances from property lines,
location of the discharge point needs to be signed and sealed by a registered En
Three copies of plans must be submitted.
2) Plans and specifications for purchased remediation equipment, (i.e. air strippe
must be reviewed by a professional engineer and certified as applicable to the pa
use and the equipment's-a—dherence to good engineering practices. This can be (
a short report on the models of the equipment and their use in the treatment prod
3) Copy of calculations of removal efficiencies for benzene, toluene and other consl
of interest, sizing of reinediation equipment in relation to flow and final disch
limited parameters in relation to permit limits.
4) An Authori - zation to Construct fee of $150.00 is needed to process the plans
above named facility.
5) If submitted by someone other than the owner, a letter of Delegation of Authorit
the property owner to you to serve as the agent to sign the Notice of Intent
facility.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX 919-733-,
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper
r the
ruin

Environmental Division
August 2., 199
'age Two
Refer to the subject permit application number when providing the requested infor
your application to -being returned as incomplete, in accordance with I A NCAC 2H .0208.
I am by this letter also requesting our Regional Office to offer recommendations and comments of
the above named site.
If you have any questions on this matter, please call me at 91.9 A 33-}83.
Sincerely;
Charles A. Alvarez
Environmental Engineer
r
NP)ES Group
cc; Mooresville Regional Office
Groundwater Section
P6 iffil 'NCG51 {121.

SCArt
Conoco, I
,ne:
aress; ff o_US t
Texas
t2AXY;
(3)State,
.tom. T)EPT' op
ENVIRONMENT, HEALTM
& NATURAL RESOURCES
8FP 26 lqoi
DIVISION OF ENVIRONMENTAL MANAGWENt
MOORESVIEEE REGIONAL OM
A. Pttston Howard, Jr, P.E.
Acting Director
N—T
LVVVVj
requesting PerTnit.
ion)
D. Phone
3. Application type (check appropriate selection):
A. New or Proposed; X
B. Existing; -if previously pennitted, provide pern-dt number
aM issw date-..
C. Modification;
(Descnfbe the nature of the modification).
4. Description of discharge
A. Please state the number of separate discharge points.
'2A 1; 3A 1; 4j 1; __J L
Page 1

NOTE: Construction of any wastewater treatment facilities require submission of three (3)
and specifications along with their application. Design of treatment facilities n
with requirement 15A NCAC; 2H .0138. If construction applies to the discharge,
three is of plans and specifications with the application.
S. What is the nature of the business applying for this permit.
6. Name of receiving water or waters; Brier Creek Classification: C
(Attach a USGS topographical map with all discharge point(s) clearly marked)
7. Is the discharze directly to the receiving water?(y,N) N
point, if,a storm sewer is the only, viable means of discharge.)
8. Please address possible non -discharge alternatives for the following options:
A. Connection to a Regional Sewer Collection System;
B. Subsurface Disposal;
C. Spray Irrigation;
similar offense.)
Notice of Intent must be accompanied by a check or money order for $400.00 made payable to th4
Carolina Department of Environment, Health,,and Natural Resources. Mail three (3) copies o
package tb:
Division of Environmeriml Management
NPDES Permits Group
Post Office Box 29535
Raleigh, North Carolina 27626-0535
Page 3

Description of Discharge
Wastewater lesrlbiion
"OnEM,
groundwater. .'
treatment outlin
be collected for
expected.
Groundwater Treatment
The recovered groundwater will past
prior to discharge:
XI/Water Separator --
w411
!ated gasoline impacted
nt passes through the
)hase hydrocarbons will
arterly monitoring data,
Cooper Environmental, Inc. Project No. 92

L Absorption --
The eft
carbor
in seri
will hi
99% to 100%.
11 Information
W
,e.
mnation
system.
9. Fail -Safe Measures
A high level switch monitors the water level of the holding tank th�
follows the diffused aeration tank. The recovery well pump i
controlled by this switch. Flow into the system will stop if high at
levels in this tank exceed operating parameters.
Cooper Environmental, Inc. Project No. 921

10. Sampling.A.
':"ff hint will
Ices
obtained at the pipe e2dt.
J*M
n tly vacant.
,ving Waters
rge Point
charge Alternatives
gure :.
tvmg water.
tern
discharges of treated groundwater.
B. Subsurface Disposal
Discharge through a spray irrigation system is not a viable option du,
to the limited area of the site and buffer zone requirements ft
NCDEHNR regulations.
Cooper Environmental, Inc. Project No. 921

)rgy Irri atio
Cooper Environmental, Inc. :reject No. 9'

Ctc
t t
rp
MW-
ELECTRIC LINES
M
LEGEND
+
EX I T I da MONITORINGWELL LOCATIONS
RECOVERY WELL LOCATION
EXISTINGVERTICAL EXTENT WELL
"
NO
NON DETECT
VASMBURN AVE
1-2- MWY- I s* m
MW-3
UTILITY' FPO
NEC NO SAMPLE COLLECTED
P2L BELOW 2L STANDARDS
AUGUST 1993
ANALYT I CAL. RESULTS> IN PARTS PER MILLION tPPMI
mw- 1 0.05 I NO NO B2L ND NO NO
MW-2 NO NCI NO 62L NO NO NO
f EWALK
-SWALE
0' 30' 60 `

ADJU TA LE PRODUCT DRAW
INFL NT EFF
1
DRAIN
.'t
ESI BAFFLED
ICI USED AERATION TANK
AIR EXHAUST
SECTION A-
WAR OUTLET TA
TRANSFER
DUMP � ��
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DIFFUSION
MEMBRANE
WATER OUTLET
PER LNKj
ENGINEERS GEC?LC?G
,• ,,*• „ •* . +. TREATMENT SYSTEM COMPC
FORMER JET STORE Nt
t 3301 .MONROE
CHARLOTTE. NORTH
*. `:f.... DATE. 3 4/ 4 FIGI
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FILTER BANK/REGULATORS
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TRANSFER PUMP

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CONNECTtl3".1 14, OPTIONS
X" COUPLING ANO
PLUG, Interconnecting
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Flexible 1 1/4" diameter F
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pressure gauge and intet
sample valve,
Pre -filter For
FIV-111MI LV111ZjZM1fV
piped and mounted
Filter is of carbon Ste
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PRESSURE SAMPLE \—INTERCONNECTIN
GAUGES VALVE TUBING
TYPICAL INSTALLATION
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State of North Carolina
Department of Environment, Health and Natural Resources
Division of Environmental Management
12 North Salisbury Street « Raleigh, North Carolina 27611
James n, Governor A. Preston Howard, Jr., P.E.
William W. Cobey, Jr., Secretary Acting Director
QFINTENT
Naha I Pcrliutat Mischa e Eli nation stem
Appli tie n for Cove ge der ncral Permit N 1 Groundwater ediation projects
designed to at petrol con rya dater.
%. Name, Address, location, and telephone number of facility requesting Permit.
A. Official N e. Conoco, Inc.
B. Mailing Addrew. ox 4784
(I)Street ,Address,
(2)City; .� Houston
(3)State; Texas
(4 );Zip, -474
O)County;
C. Location. (Attach map delineatin gneral facility* location)
(I)StreetAddress; :3�I Monroe Road
(2)City, Charlotte
(3)State;
WCo nty, Me
D. Telephone Number; )
2. facility Contact. Dana Hayworth
A. Name;
B. Title Division Mona er o F ciences
C. CompanyName;
`doer lavior.entl Inc.
D. Phone Number, CQ4
. Application type (check appropriate selection):
A. New or Proposed; X K
. Existing; If previously permitted, provide pernit, number
and Lcsue date
C. Modification;
(Describe the nature of the modification). f
4. Description of discharge
A. Please state the number of separate discharge points.
t l; 2 1 A ]; 4A 1; I.
Page

B. Please describe the amount of wastewater being discharged per each separate discharge point:
1.7200 (gpd) 3: (gpd) 4:
gallons per day (gpd) 2: — (gpd)
C. dh�k the duration and frequency of the discharge, per each separate discharge point:
1. Continuous: X
2- Entern-tittent(please describe).
3. Seasonal (check month(s) the discharge occurs): January 11; February 11; March t 1; April t 1,
May f I;June [ 1; July f 1; August 11; September [1, 1: NOVen*xx 11; December [I
4. How many days per week is there a discharge?(check the days the discharge occurs)
Monday 11, Tuesday[ 1, Wednesday f 1, Thursday [ 1,Friday [ 1, Saturday t 1, Sunday [ 1.
5. How much of the volume discharged is treated? (state in percent)-LO—O%
I.
Benzene*;
2.
Toluene;
3.
Ethylbenzene*;
4.
Xylene*;
5.
Lead;
6.
Methyl tert-buty
7.
Dibromoethane 1
8.
1,2-dichloroetha
9.
Isopropyl ether;
10.
Naphthalene;
11.
Phenol;
*(An EPA approved method capa
compounds).
E. Please
check the appropri
)ST rmv"T. :XUX1F1t:'utU"t V-- A., V.,4ve. u—. — J— r`----- -- --- --I'--
owing volatile organic compounds should be included along with
ether (MTBE);
tether
le,
2. Air Stripper;
3, Wfused Aeratiom- X
4. Activated Carbon Absorption;--!--,
5.
6.--- Separately, , pease describe in de' ail(size, volumecapacity, design flow, through treatment,
etc.) each type of treatment that was checked in I through 5. Include, if any, the
manufacturees information on each type of treatment. Also provide the removal efficiency of
each compound detected for the project, if known. Give design specifics (ie. design volume of
each unit, materials used in air stripper,, etc.). Existing treatment facilities should be
described in detail and design criteria or operational data should be provided(including
calculations) to ensure that the facility can comply with requirements of the General Permit.
Please include model and calculations used in determining the design requirements for the air
stripper.
7. What are the well sizes and how many exist.
8. Please state the pump sizes and it location in relation to the treatment used in part 2.E.
9. Please explain what fail-safe measures, such as audible and visual alarms or automatic
shutoff systems, are provided to ensure no system failures.
10. Is there an access to the effluent for sampline. ( either an open pipe or a valve to obtain a
sample)
Page 2

NOTE: Construction of any wastewater treatment facilities require submission of three (3) sets of play
and specifications along with their application. Design of treatment facilities must comp
with requirement 15A NCAC 21-1 .0138. If construction applies to the discharge, include t
three sets of plans and specifications with the application.
5. "Tat is the nature of the business applying for this permit.
. Name of receiving water or eaters; Brier Creek Classification: _ C
(Attach a USGS topographical map with all discharge point(s) clearly marked)
. Is the discharge directly to the receiving water?( ",N)
If no, state specifically the discharge paint. Mark clearly the pathway to the potential receivii
point, if a storm sewer is the only viable means of discharge.)
8. Please address possible non -discharge alternatives for the following options:
A. Connection to a Regional Sewer Collection System;
B. Subsurface Disposal;
C. Spray Irrigation;
any
1 or
4fies,
red t
ent
rot to
vides
for a
Carolina Department of Environment, I-iealt , d Fiat r l Resources. Mail three (3) copies of enti
package tip:
Division of Envirortmental Management
NPDES Permits Group
Post Office Box 2 535
Raleigh, North Carolina27626-0535
Page

T16 V-+ 4 4#% 0%f lrUar-'htl ^
r 'Ab
D. Wastewater Dqseri tion
The wastewater to be discharged is treated gasoline impacted
groundwater. Prior to discharge the effluent passes through the
treatment outlined below. Recovered liquid -phase hydrocarbons will
be collected for disposal. On the basis of quarterly monitoring data,
recovery of measurable volumes of liquid -phase hydrocarbons is not
expected.
& Groundwater Treatment
6. The recovered groundwater will pass through the following components
prior to discharge:
Oil/Water Separator --
Recovered groundwater will enter'a baffled separator manufactured by
Ejector Systems, Inc. Separator dimensions are 60" x 60" x 24",
approximate volume is 430 gallons, Figure 3 presents a schematic of
the components of the treatment system. Floating product recovered
in the separator will be pumped to a holding tank for disposal. Water
will exit the separator by gravity -flow to a diffused aeration tank.
Diffused Aeration --
Air is supplied to the 24" x 12" x 24" diffused aeration tank by a
regenerative blower, rated at 96 cfm. Air is injected through a PVC
membrane of circular cross-section (diameter 2", length 24"). Figure 3
presents a schematic of the components of the treatment system. Air
exhausted from the diffused aeration tank will pass through two 200
pound air purification canisters, connected in series. Water exiting the
diffused aeration tank will flow through a holding tank prior to being
pumped through granulated activated carbon. Diffused aeration tanks
have removal efficiencies ranging from 85% to 99%.
Cooper Environmental, Inc. Project No. 92155

Activated Carbon Absorption --
The effluent will be polished by passing through granulated activated
carbon (GA ). Two 200 pound water purification canisters, connected
in series, will be used. A sampling port located between the canisters
will be monitored in order to detect depletion of the GAC in the
upstream canister. Subsequent to depletion, the upstream canister
will be removed for regeneration, the downstream canister ll assume
the upstream position, and a new canister will be placed in the
downstream position. Monitoring of the effluent between canisters will
continue as before. GAC systems have removal efficiencies ranging
from 9% to 100%.
7 Well Information
Groundwater is obtained through a single 6" recovery well located
directly below the trailer housing of the treatment system. 1
photocopy of the well construction record is attached Monitoring of
water levels and groundwater chemistry via the six observation wells
will continue.
S', Pump Information
pneumatic total fluids pump, 3" diameter, 1. ' in length, rated at 2.4
gp , will transfer water from the recovery well to the treatment
system.
9 Fail -Safe Measures
A high level switch monitors the water level of the holding tank that
follows the diffused aeration tank. The recovery well pump is
controlled by this switch, Flow into the system will stop if high water
levels in this tank exceed operating parameters.
Cooper environmental, Inc. Project No. 92111

10. Sampling Access
Effluent will be routed to a nearby grass lined swale. Samples may be
obtained at the pipe exit.
S. Nature of Business
The site is a former convenience store/retail gas outlet. The site is
currently vacant.
6. Receiving Waters
The discharge will be received by Brier Creek, classification "C". A
USG S topographical map is presented as Figure 2.
7. Discharge Point
The wastewater will be discharged into a nearby grass lined sale. The
Swale is a component of the City of Charlotte stormwater drainage
system, Figure 2, Topographical Location Map, demonstrates the
approximate path of the discharge to the receiving water,
S. Non -Discharge Alternatives
A. Connection to a Rep-ional Sewer Collection System
The Charlotte Mecklenburg Utilities Department is not accepting
discharges of treated groundwater.
B. Subsurface_leis posal
Discharge through a spray irrigation system is not a viable option due
to the limited area of the site and buffer zone requirements in
NCDEHNR regulations.
Cooper Environmental, Inc. Project No. 92155

sn
viability due to the limited area of the site and expects
infiltration rates of the ;natural soils.
Cooner Environmental. Inc. Proiect No. 92155

BRICK
ICU I LOING
DRY CLEANER I BLOCK
WALL
BRICK
BUILDING
(S,C HONORM
mw-5 tASPHALT FENCE
MW-4
KLE
01
ELECTRIC LINES WASHBVRN AVE ISAP
DI
mwv-t
MW - 3 CULVERT IDISCHARGE POINTI
'WALE
LEGEND UTILITY PbLE
+ EXISTING MONITORING WELL LOCATIONX
RECOVERY WELL LOCATION MW-I
Eil
EXISTING VERTICAL EXTENT WELL LOCATION
ND NON DETECT
NSC NO SAMPLE COLLECTED
132L BELOW 2L STANDARDS
sa 0, 30' 60
AUGUST 1993
ANALYTICAL RESULTS IN PARTS PER MILLION (PPM)
No. B T E x MTBE ECG B IPE
MW- 1 0,051 ND ND B2L ND ND ND
vik CAR01 OOPER NVIRONMENTAL
MW-2 ND KID KID B2L ND KID ND mWERS * GEOLOGSTS * SCIENTISTS
Z
ITE DIAGRAM AND QUARTERLY MONITORING
MW 3 NSC NSC NSC N�S- C NSC NSC NSC
RESULTS AUGUST 1993
g7

7
"Is ADJU TA LE PRODUCT DRAW OFF
IiF UENT EFF
i
i
RAIN
ESI BAFFLED
DIFFUSED AERATION TANK
AIR EXHAUST
SECTION 'A --A
� ' WATER INL
EATER OUTLET
T SFER
�a
PUMP
DIFFUSION
MEMBRANE
WATER OUTLET
ACV COOPER ENVIRQ�LMENTAI
m ENGINEERS- GEOLOGISTS SCIENTIST;
HOLD oz *##
***** / " TREATMENT SYSTEM COMPONENT SCHEMATIC
*gym slop;*.,
FORMER JET STORE NUMBER 33009
I 3301 MONROE ROAD
CHARLOTTE, NORTH CAROLINA
* kd PROJECT '93155 SCARF: NOT TO SAL]
' F . DATE: 3/4/J4 FIGURE:

000. WATER FLOW DIRECTION
AIR FLOW DIRECTION
CONTROL PANEL
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WATER PURIFICATION CANISTER
200 POUND ACTIVATED CARBON
MLET AND OUTLET OPTIONS
1.
7" 1/4-
NPT COUPLING AND
PLUG. Interconnecting
Piping Kit VC Flexible 1 1/4" diameter Ptubing
1). A N - r', with hose clamps. Includes inlet
pressure gauge and intermediate
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sample valve,
$5 GALLON, 0.0 T. 17C Pre -filter For
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24�UDIOA. x 34* Pre -filter consisting of'a basket filter
DRAIN CONNECTION piped and mounted on support frame.
3/4* SUNG WM I
PLUG Filter is of carbon steel construction.
RANMENT (3T1 1_-1 Canisters in series for 10 gpm flow (contact time 0 10 gpm - 15 minutes)
PRE FILTER CARBON CANISTERS
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INLET L-I L-1 L-1 EFFLUENT
PRESSURE SAMPLE INTERCONNECTING
GAUGES VALVE TUBING
'ICAL INSTALLATION
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OPER ENWROMWENTAL
�4SEERS • GEOLOGISTS • SCIENTISTS
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FORMER i STORE NUMRFR 33009
1 MONROE ROADr£r
w - I No fit .P NU 621 Nr l Nt, M Nt PROJECT: 92155 SALE: i w SW

State of North Carolina
7.
Department of Environment, „ •
Health and Natural Resources f
j A 6i 467:10C:4111
Division of Environmental Management C4‘
rA
01 lc
James B. Hunt, Jr., Governor .
Jonathan B. Howes, Secretary \ E) IE 1---I NI Pt
A. Preston Howard, Jr., P.E., Director
N.C. DEPT. or
August 25, 1994 ENVIRONMENT, HEALTH,
& NATURAL RESOURCES
Environmental Division AUG 30 19(4A
Conoco, Inc.
PO Box 4784
Houston TX 77210-4784 DIVISION OF ENVIRONMENTAL MANAGEMENT
,
MOORESVILLE REGIONAL OFFICE
Subject: Application No. NCG510215
Additional Information Request
Groundwater Remediation
Former Jet Store 33009
Charlotte
Mecklenburg County
Dear Environmental Division:
The Permits and Engineering Unit has completed a preliminary engineering review of the subject
application. Cooper Environmental, Inc. is the company that submitted the package to NCDEM, however
no return address was included in the package.
The following items must be addressed before we can complete our review:
1) A site location map of the remediation equipment in relation to other features at the site
(such as roads, buildings and wells) with buffer distances from property lines and the
location of the discharge point needs to be signed and sealed by a registered Engineer.
Three copies of plans must be submitted.
2) Plans and specifications for purchased remediation equipment, (i.e. air stripper unit),
must be reviewed by a professional engineer and certified as applicable to the particular
use and the equipment's adherence to good engineering practices. This can be done as
a short report on the models of the equipment and their use in the treatment process.
3) Copy of calculations of removal efficiencies for benzene, toluene and other constituents
of interest, sizing of remediation equipment in relation to flow and final discharge of
limited parameters in relation to permit limits.
4) An Authorization to Construct fee of $150.00 is needed to process the plans for the
above named facility.
5) If submitted by someone other than the owner, a letter of Delegation of Authority from
the property owner to you to serve as the agent to sign the Notice of Intent for the
facility.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled./ 10% post-consumer paper

•
Environmental Division
August 25, 1994
Page Two
Refer to the subject permit application number when providing the requested information. Please
submit two copies of all information to my attention at the address below. Also, please
note that failure to provide this additional information within 30 days of the date of this letter, will subject
your application to being returned as incomplete, in accordance with 15A NCAC 2H .0208.
I am by this letter also requesting our Regional Office to offer recommendations and comments on
the above named site.
If you have any questions on this matter, please call me at 919/733-5083.
Sincerely,
Charles A. Alvarez
Environmental Engineer
NPDES Group
cc:
Groundwater Section
Permit File NCG510215

•
N.C. DEPT. OF'
ENVIRONMENT, HEALTH, , �,�,ice
& NATURAL RESOURCES 41ANWL �
•�.st"f. AUG 30 1994 1 '1 3
�`of r% SION OF ENVIRONMENTAL MANAGEMENT
M000ESYIIIE REGIONAL OFFICE
-..----2:::, N Al
fifi-A.
State of North Carolina
Department of Environment, Health and Natural Resources `-1-I-la
Division of Environmental Management
512 North Salisbury Street • Raleigh,North Carolina 27611 ';1 r t7
r
A. Preston Howard,Jr. P.E.
James G. Martin,Governorr,e ''}
William W. Cobey,Jr.,Secretary Acting Director ' ;,
NOTICE OF INTENT ,.r
',Lt.. c)�d.
National Pollutant Discharge Elimination System .'y . ." :
Application for Coverage under General Permit NCG510000;Groundwater remediation projects :rt =
designed to treat petroleum contaminated groundwater. --.
1. Name, Address,location,and telephone number of facility requesting Permit.
A. Official Name: Conoco, Inc.
B. Mailing Address: P.O. Box 4784
(1)Street Address; ©uston
- (2)City; "
(3)State; Texas
(4)Zip; 77210-4784
(5)County;
C. Location. (Attach map delineatinggeneral
fa Road location)
330
(1)Street Address; Charlotten
(2)City;
(3)State; North Carolina
(4)County; Mecklenburg
D. Telephone Number; ( ) -
2. Facility Contact: Dana Hayworth
A. Name; -
B. Title; Division Manager of Forensic Sciences
C Company Name; Cooper Environmental, Inc. -
D. Phone Number, (704 ) 845 - 2000
3. Application type (check appropriate selection):
A. New or Proposed; X
B. Existing; If previously permitted,provide permit number
and issue date
C. Modification;
(Describe the nature of the modification):
4. Description of discharge
A. Please state the number of separate discharge points.
1,[l; 2,[]; 3A l; 4,11; __,i l•
Page 1

NOTE: Construction of any wastewater treatment facilities require submission of three (3) sets of plans
and specifications along with their application. Design of treatment facilities must comply
with requirement 15A NCAC 2H .0138. If construction applies to the discharge, include the
three sets of plans and specifications with the application.
5. What is the nature of the business applying for this permit.
6. Name of receiving water or w Brier Creek
aters; Classification: C
(Attach a USGS topographical map with all discharge point(s) clearly marked)
7. Is the discharge directly to the receiving water?(Y,N) N
If no, state specifically the discharge point. Mark clearly the pathway to the potential receiving
waters on the site map. (This includes tracing the pathway of the storm sewer to its discharge
point,if a storm sewer is the only viable means of discharge.)
8. Please address possible non-discharge alternatives for the following options:
A. Connection to a Regional Sewer Collection System;
B. Subsurface Disposal;
C. Spray Irrigation;
• •
9. I certify that I am familiar with the information contained in the application and that to the best of
my knowlilAge and belief such information is true,complete,and accurate.
otir 7114,
• ,vevrintedNarrecipersonsigning Ivan A. Cooper, P.E.
•
• N
e ,v.,)%
Title President /eageffe (...v(/‘re eizAtzwnk-fistc.
E : Z I •
3 • : 6e. Co/Jo G.4: Ave_
.
• .
WI •.0) • Date Application Signed /7/ /t1,1
S 3
••• •• •••sn\-4: „Signature of Applicant . Cr 6,1•45-C42 /AG—
#°,* 708VO 0"°•%%% 7
" • .
143-215. B (i)PROVIDES THAT:.
Any person who knowingly makes any false statement, representation, or certification in any
application,record,report,plan or other document filed or required to be maintained under Article 21 or
regulations of the Environmental Management Commission implementing that Article,or who falsifies,
tampers with or knowingly renders inaccurate any recording or monitoring device or method required to
be operated or maintained under Article 21 ,or regulations of the Environmental Management
Commission implementing that Article, shall be guilty of a misdemeanor punishable by a fine not to
exceed$10,000,or by imprisonment not to exceed six months,or by both.(18 U.S.C.Section 1001 provides
a punishment by a fine of not more than$10,000 or imprisonment not more than 5 years, or both, for a
similar offense.)
Notice of Intent must be accompanied by a check or money order for$400.00 made payable to the North
Carolina Department of Environment, Health,and Natural Resources. Mail three (3) copies of entire
package tb:
Division of Environmental Management
NPDES Permits Group
Post Office Box 29535
Raleigh, North Carolina 27626-0535
Page 3

4. Description of Discharge
D. Wastewater Description
The wastewater to be discharged is treated gasoline impacted
groundwater. Prior to discharge the effluent passes through the
treatment outlined below. Recovered liquid-phase hydrocarbons will
be collected for disposal. On the basis of quarterly monitoring data,
recovery of measurable volumes of liquid-phase hydrocarbons is not
expected.
E. Groundwater Treatment
6. The recovered groundwater will pass through the following components
prior to discharge:
Oil/Water Separator --
Recovered groundwater will enter a baffled separator manufactured by
Ejector Systems, Inc. Separator dimensions are 60" x 60" x 24",
approximate volume is 430 gallons. Figure 3 presents a schematic of
the components of the treatment system. Floating product recovered
in the separator will be pumped to a holding tank for disposal. Water
will exit the separator by gravity-flow to a diffused aeration tank.
Diffused Aeration --
Air is supplied to the 24" x 12" x 24" diffused aeration tank by a
regenerative blower, rated at 96 cfm. Air is injected through a PVC
membrane of circular cross-section (diameter 2", length 24"). Figure 3
presents a schematic of the components of the treatment system. Air
exhausted from the diffused aeration tank will pass through two 200
pound air purification canisters, connected in series. Water exiting the
diffused aeration tank will flow through a holding tank prior to being
pumped through granulated activated carbon. Diffused aeration tanks
have removal efficiencies ranging from 85% to 99%.
Cooper Environmental, Inc. Project No. 92155

Activated Carbon Absorption --
The effluent will be polished by passing through granulated activated
carbon (GAC). Two 200 pound water purification canisters, connected
in series, will be used. A sampling port located between the canisters
will be monitored in order to detect depletion of the GAC in the
upstream canister. Subsequent to depletion, the upstream canister
will be removed for regeneration, the downstream canister will assume
the upstream position, and a new canister will be placed in the
downstream position. Monitoring of the effluent between canisters will
continue as before. GAC systems have removal efficiencies ranging
from 99% to 100%.
7. Well Information
Groundwater is obtained through a single 6" recovery well located
directly below the trailer housing of the treatment system. A
photocopy of the well construction record is attached Monitoring of
water levels and groundwater chemistry via the six observation wells
will continue.
8. Pump Information
A pneumatic total fluids pump, 3" diameter, 1.5' in length, rated at 2.4
gpm, will transfer water from the recovery well to the treatment
system.
9. Fail-Safe Measures
A high level switch monitors the water level of the holding tank that
follows the diffused aeration tank. The recovery well pump is
controlled by this switch. Flow into the system will stop if high water
levels in this tank exceed operating parameters.
Cooper Environmental, Inc. Project No. 92155

10. Sampling Access
Effluent will be routed to a nearby grass lined swale. Samples may be
obtained at the pipe exit.
5. Nature of Business
The site is a former convenience store/retail gas outlet. The site is
currently vacant.
6. Receiving Waters
The discharge will be received by Brier Creek, classification "C". A
USGS topographical map is presented as Figure 2.
7. Discharge Point
The wastewater will be discharged into a nearby grass lined swale. The
swale is a component of the City of Charlotte stormwater drainage
system. Figure 2, Topographical Location Map, demonstrates the
approximate path of the discharge to the receiving water.
8. Non-Discharge Alternatives
A. Connection to a Regional Sewer Collection System
The Charlotte Mecklenburg Utilities Department is not accepting
discharges of treated groundwater.
B. Subsurface Disposal
Discharge through a spray irrigation system is not a viable option due
to the limited area of the site and buffer zone requirements in
NCDEHNR regulations.
Cooper Environmental, Inc. Project No. 92155

C. Spray Irrigation
Discharge through subsurface infiltration is considered to be of limited
viability due to the limited area of the site and expected slow
infiltration rates of the natural soils.
Cooper Environmental, Inc. Project No. 92155

BRICK
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ANALYTICAL RESULTS IN PARTS PER MILLION (RPM)
No. B T E X MTBE EDB IPE
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MW-2 NO NO ND B2L ND ND NO '. ""z,�SSi t '4 ENGINEERS
MW-3 NSC NSC NSC NSC NSC NSC NSC :a '+ -ITE DIAGRAM AND QUARTERLY MONITORING
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MW-4 ND ND ND ND ND ND ND Jb2• ? FORMER JET STORE NUMBER 33009
.et t% r 3301 MONROE ROAD
.
MW 5 B2L B2L ND 82L ND ND NO ��• �G,9'•G(; E;.�'•� CHARLOTTE, NORTH CAROLINA
MWV 1 ND ND NO 82L ND ND ND ,+I•,„.., A' C©10,0PROJECT: 92155 SCALE: 1" ffi 50'
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'7 - FORMER JET STORE NUMBER 33009
3301 MONROE ROAD
•.<�1 , ,t.)b CHARLOTTE, NORTH CAROLINA
j PROJECT: 92155 SCALE: 1 : 24,000
�',,,V,•A'.+•LG�;I,"b'ei- y - DATE: 3/2/94 FIGURE: 2

////;910 ADJU TA LE PRODUCT DRAW OFF
INFLU NT FF UEt'
DRAIN
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�/c FORMER JET STORE NUMBER 33009
. - i . 3301 MONROE ROAD
C CHARLOTTE. NORTH CAROLINA
It•;;' -11'I'I PROJECT: 92155 SCALE: NOT TO SCALE
••��'`• DATE: 3/4/94 FIGURE: 3

POO' WATER FLOW DIRECTION
AIR FLOW DIRECTION
CONTROL PANEL
— LEVEL INDICATOR
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RECOVERY WELL -- ;I III
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---- FORMER JET STORE NUMBER 33009
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TOTAL FLUIDS PUMP :��
(POSITIVE DISPLACEMENT, • - •. 'Ci iT.. ex 'PROJECT: 92155 SCALE: NONE
TOP LOADING) �'•,,G-94,.•......•�'Qc�;...N.
, A cpp t�. DATE: 3/10/94 FIGURE: 4
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:, CARBTROL ,
Y-,
WATER PURIFICATION CANISTER
200(--
POUND ACTIVATEDCARBON �`"1
The CARBTROL L-1 (liquid)
Canister handles up to 10 gpm.
. ��+. FEATURES
• 200 pounds of high activity carbon.
• Large 1 1/4" internal piping.Low
pressure drop allows operation of
three canisters in series.
lACARSTR '" • Standard FPT couplings for easy
` ..< installation - saves time and money.
• Special "no leak" lid gasket.
C
• Heavy duty steel drums, DOT 17C,
4 � suitable for shipment of spent hazardous
C:` carbon.
• Piping design eliminates channeling.
SPECIFICATIONS
P
DRUM 24" 0 x 4" high, R 4 P
mild steel, epoxy E R
phenolic internal s - 1.5 E
S S
coating.
s
CARBON 200 lbs. R
0 ` 1.C? R
2
SHIPPING WEIGHT 250 lbs. P a
INLET 1 1/4" FPT, steel F
-� 0.5
P
T P
OUTLET 1 1/4" FPT, steel s
0 g I
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INTERNAL PIPING 1 1/4" PVC 0 0 5 1 g
DRAIN 3/4" bung FLOW--GPM
n,
CARBTROL 39 Riverside Avenue,Westport,CT 06880.1-800-242.1150 [phone]
COAPOR A 1 1 o N
Coovrioht 1991 Carbtrc t Corporation- 5/29/92 AT-100I#2

RBTROL
WATER PURIFICATION CANISTER L-1
200 POUND ACTIVATED CARBON
INLET ANO cutter
CONNECTIONS,I
NPT COUPLING ANO
PLUG OPTIONS
Interconnecting
Piping Kit
Flexible 1 1/4" diameter PVC tubing
with hose clamps. Includes inlet
ORA -
•
pressure gauge and intermediate
sample valve.
Pre-filter For
ss0.ALL044.DOT,17C
RUM,WITH EPDXY Suspended Solids Removal
UNING
24.NA x34- Pre-filter consisting of a basket filter
°RAIN CONNECTION piped and mounted on support frame.
314*SUNG WITI Filter is of carbon steel construction.
PLUG
ARRANGEMENT (3) L-1 Canisters in series for 10 gpm flow (contact time @ 10 gpm 15 minutes)
PRE FILTER CARBON CANISTERS
INLET L-1 L-1 EFFLUENT
IAA z 0 • CoOP,
X
PRESSURE SAMPLE INTERCONNECTING
GAUGES VALVE TUBING
TYPICAL INSTALLATION
4 -
4111"7 ° 4 i,r!
44!"4"t
CARBTROL 39 Riverside Avenue,Westport,CT 06880 1-800-242-1150 [phone]
COR P 0R AT I0N