NCS000508_Additional Info_20040216

14e'� m.!_ -
�V
PIEDMONT
TRIAD
AIRPORT AUTHORITY®
January 6, 2004
Mr. Bradley Bennett
North Carolina Department of Environmental and Natural Resources
Division of Water Quality, NPDES Unit
l 517 Mail Sen vice Ceniten
Raleigh, NC 27699-1617
SUBJECT: Petition to Sample Substantially Identical Outfalls
Piedmont Triad Airport Authority
Dear Mr. Bennett,
Per your request and per your previous instructions to our consultant, Baker and
Associates, we are submitting the attached Petition to Sample Substantially Identical
Outfalls prepared for the Piedmont Triad International Airport (PTIA).
The North Carolina Department of Environment and Natural Resources (NCDENR),
Division of Water Quality (DWQ) notified the Piedmont Airport that they were required
to obtain an individual industrial NPDES stormwater permit. As part of the NPDES
stormwater permit application, sampling of all outfalls is required.
However, at (Ire recommendation of N(.'D N1(, and in the interest of limiting the anniounit
of sampling required, this document was prepared to request permission to sample 6
substantially identical outfalls on the airport property.
The tentative schedule that we propose to complete the NPDES process is as follows:
• January 6, 2004 — PTAA submits the signed petition to sample substantially identical
outfalls to DWQ.
• January 6, 2004 - March 6, 2004 - NCDENR DWQ review / NCDENR — PTAA
meetings regarding the petition to combine outfalls.
• March 7, 2004 May 15, 2004 — PTAA to review and implement continents
received from the DWQ. The sampling and analysis plan will be finalized, and
sampling will be conducted on the approved outfalls.
Piedmont Triad International Airport
Post Office Box 35445 • Greensboro, North Carolina 27425
Greensboro, [phone] • High Point [phone] • Winston-Salem [phone]
FAX: [phone]

• May 15, 2004 - July 1, 2004 - Receive -analytical sampling results from the
contracted lab and finish preparation of the NPDES stormwater permit application.
July 15, 2004 - Submit the completed NPDES storm water application permit
to the NCDENR DWQ.
We appreciate your patience and consideration of this petition. We trust that this
implementation schedule will meet your needs. Please feel free to call me at 336/665-
5600, ur Mi. Van Nuah at Bak i at 336/931 1500 with any quostiuus.
Sincerely,
PILDMONT 'TRIAD AIRPO T AUTHORITY
ickie L. Elm re
Director of Development

PETITION TO SAMPLE SUBSTANTIALLY IDENTICAL OUTFALLS
Introduction and Purpose
The Piedmont Triad International Airport (PTIA) is classified by the Federal Aviation
Administration as a small -hub airport facility, and is located in Greensboro, North Carolina. The
property, owned by the PTIA, encompasses approximately 3,468 acres. The existing airport
drainage system directs stormwater to three different watersheds including- Brush Creep located
northwest of the aitpott, Ih,tsopou Cw*k located southeast of the allpott, and Decp Rivet located
south of the airport. The attached diagrams entitled Proposed NPDFS Outfalls shows the
location of the airport outfalls and approximate drainage areas. PTIA is classified as SIC 45
(Transportation by Air) or NAICS 481 (Air Transportation). Pursuant to the November 16, 1990,
NPDES stormwater permit application regulations, this facility is considered to be "engaging in
industrial activity" for the purposes of stormwater permit application requirements in 40 CFR
122.26(b)(14)(i) and (viii).
In accordance with 40 CFR 122.21 (g)(7) of the NPDES permit regulations, PTIA petitions the
State of North Carolina for approval to sample one representative storm water outfall from
groupings of stormwater outfalls that are substantially identical. There are a total of 33
stormwater outfalls identified at PTIA. This petition divides the 33 outfalls into six groups. Of
these six groups, one outfall from each group will be chosen for analytical testing as part of the
requirements for the NPDES Stoiin Watet Peiinit Applicettiou. The basis Cot [WIltiou i.s stated in
40 CFR 122.21 (g)(7) as follows: "When an applicant has two or more outfalls with substantially
identical effluents, the Director may authorize the applicant to test only one outfall and report
that the quantitative data also apply to the substantially identical outfalls."
-1-

This submission documents that the grouped outfalls have storm water discharges characterized
as follows:
1) Substantially identical industrial activities and processes occurring both indoors and outdoors;
2) Substantially identical significant materials (including raw materials, fuels, and waste
products) to which stormwater run off may be exposed.
3) Substantially idontieal material management practices (such as secondary coritaiiinent
structures, vegetated swales, oil/water separators, and stormwater collection ponds); and
4) Substantially identical flows, as determined by the estimated runoff coefficient and
approximate drainage area at each outfall.
-2-

Description of Activities and Storage Areas at PTIA
The activities and storage areas at PTIA include but are not limited to the following:
• Terminal Facilities - Main terminal building with passenger facilities, ticketing facilities,
airplane gates, retail shops, and administrative offices.
• Tenant Hangar Facilities - These facilities (i.e., CBSSNA, Tradewinds) are large structures
used fui the storage and maintenance of aircraft and servicing materials. l'ypical used or
stored materials include oils and gwases, and solvents.
• Service Facilities/Fixed-Base Operators - These facilities are used for servicing aircraft.
Cargo areas are included in this category. Regulated substances found in this area are fuels
and oils (including hydraulic fluids, degreasers, and motor lubricants). Deicing of aircraft and
airfield surfaces is performed, as necessary using glycol -based deicing fluids.
• Rental Car Facilities - Operations at the rental car facilities consist of routine automobile
maintenance, refueling and general upkeep of vehicles. Significant materials stored at rental
car facilities include gasoline, new and used oil, greases and solvents.
• Airfield Maintenance Area- Used for loading gasoline and diesel fuel and airport vehicle
fueling, storage and maintenance of heavy equipment.
• PTAA Facilities (Airport Authority) - Maintains a vehicle fueling pump station and
emergency generators for power outages.
-3-

2. Description of Significant Materials at PTIA
The significant materials stored on PTIA property are used for aircraft refueling, deicing and
maintenance, and for the refueling and maintenance of rental cars and other airport vehicles from
tenants located on airport property. Significant materials are defined in 40 CFR 122.26 (b)(12) as
raw materials, fuels, materials such as solvents, detergents, and plastic pellets, hazardous
substances, anv chemical in the facility that are required to be reported under SARA 111, and
waste products such as ashes, slag and sludge that have the potential to be released with
stormwater. The tenants of PTIA have both underground storage tanks (USTs) and aboveground
storage tanks (AS I's) that are located both indoors and outdoors.
The Piedmont Triad Airport Authority (PTAA) maintains several aboveground and underground
storage tanks containing significant materials. These tanks are located throughout the airport, and
primarily contain diesel fuel or gasoline, used for various boilers, generators, and pump stations.
PTAA also stores potassium acetate at the airfield maintenance facility.
PTIA Tenants - Several PTIA tenants maintain underground and/or aboveground storage tanks,
primarily containing oils and various types of fuels. PTIA tenants typically store the following
types of materials:
• Tenant Hangar Facilities - Typical used or stored materials are solvents, oils and greases.
• Ahline Service Facilities/Fixed-Base Operalors - Significant materials found in these areas
include.
• refueling - Jet A fuel, aviation gasoline along with other fuels;
• deicing - ethylene -glycol and propylene glycol for deicing; and
• servicing of aircraft - new and used oils including hydraulic fluid, and degreasers
and paint (for touch ups).
• Rental car facilities - Significant materials commonly stored at rental car facilities are
gasoline, diesel fuel, oils and greases, and solvents.
• Airport Airfield Maintenance Area- Materials stored include gasoline, diesel fuel, solvents,
and deicing chemicals.
PTAA Facilities (Airport Authority) - materials stored include diesel, gasoline, waste oil and
glycol (See Figure 7-1 of the attached SPCC).
M

• Atlantic Aero - Aviation gasoline and Jet A Fuel are stored in this area.
3. Description of Material Management Practices at PTIA
There are engineering controls and management practices designed to prevent the release of oil
from the PTAA and tenant facilities. These controls will restrain the migration of any spilled
matorial, preventing the spill from entering navigable waters PTIA has a Shill Preveutiott
Control and Countermeasures (SPCC) Plan prepared in order to comply with Oil Regulations (dO
CFR 112) that requires any facility that stores oils and fuels with the potential to be released to a
surface water body in the event of a spill to prepare an SPCC plan for the facility. A copy of the
Piedmont Triad SPCC plan is attached.
The USTs at the airport used to store oil are constructed of fiberglass, steel, or a material
compatible with oil and the conditions of storage (temperature and pressure). Typically, the
USTs are double -walled tanks with interstitial secondary containment and have catch basins at
the fill port of the tank for containment of small spills. The large -volume USTs also have spill
and overflow protections to minimize the risks of tazik leaks and have associated piping that have
leak detection provisions with a probability of detection of 95%.
All ASTs containing oils or fuels are constructed of carbon steel or a material compatible with
oil, and are equipped with dikes or secondary containment systems that provide for 110 % of the
t;tttile coutcuts of the latgost sit tgle, tack The diked tens me SUfficieiitly impervious to contain
spilled oil. In addition, mobile or portable oil storage tanks are located so as to prevent spilled oil
from draining to the storm sewer system, As a preventive measure, trained personnel are present
to protect the nearest storm drain sewer during loading/unloading operations.
Atlantic Aero operates a bulk aviation fuel storage facility for aviation gasoline (AVGAS) and
Jet A fuel. These ASTs are surrounded by a concrete secondary containment structure subdivided
between the truck loading/unloading area and the bulk/tank pump area. Figure 7-4 of the SPCC
shows location of tanks that contain aviation gasoline and Jet A Fuel in the fuel storage area. All
pumps, pipes and hose connections for the filling of tanks and refueling vehicles are located
-5-

within this secondary containment structure. Other duel storage areas have similar containment
practices.
TIMCO has several ASTs (See Figure 7-1 of the attached SPCC) that store diesel and used oil,
many of which are stored indoors. The outdoor ASTs are equipped with secondary containment
pallets. In addition, there is an existing stormwater collection pond (EP-4) that serves as
secondary containment in the event of a spill.
Continental Airlines, United Airlines and U.S. Airways operate underground and aboveground
poly -glycol storage tanks, located at Cargo Area #2. Continental has two USTs that store poly -
glycol (6,000 gallons and 20,000 gallons). United Airlines has a 6,000-gallon AST storing poly -
glycol, and U.S. Airways a 20,000-gallon poly -glycol AST. Federal Express also maintains
deicing fluid storage at Cargo Area #3, in the form of a mobile tank and 2-3 totes. Figure 7-3 of
the SPCC depicts the location of tanks at the Airlines as well as Federal Express. A planned
stormwater management pond will serve as secondary containment in the event of a spill.
The rental car companies all have gasoline stored in underground storage tanks (5,000-2,000
gallons), along with new and used oils in aboveground and underground storage tanks (See
Figure 7-3 of the SPCC). The majority of underground storage tanks at the rental car facilities
are double -walled tanks with interstitial containment. All of the rental car facilities employ fill
port catch basins to contain small spills.
The remaining tenants at PTIA that have storage tanks have secondary containment structures for
the tanks that include fill port catch basins, containment dikes, spill pallets, and oil/water
separators. Figure 7-2 of the SPCC illustrates tenants such as Tradewinds and Timco that have
between 100 gallons and 2,500 gallons of diesel, gasoline and/or oil storage in various locations.
Engineering practices are in place to prevent oil released during the transfer operations for all
loading and unloading operations.
Eel

4. Flow Characteristics
Demonstration of Why Outfalls are Substantially Identical in terms of Flow, as Determined by
[lie Estimated Runoff C:oefliciwit and Appioxiinate Diainage Aica At Each Outfall
Please see the attached Table 1 for estimated runoff coefficients and the approximate drainage
area of each outfall. The outfalls grouped together are generally similar in drainage area and
runoff coefficient.
5. Rationale behind Groupings of outfalls
Discussed below are the reasons why groups of outfalls were determined to be substantially
identical in terms of industrial activities conducted, significant materials stored that potentially
may be exposed to stormwater runoff, stormwater management practices used, and flow.
Pertinent stormwater outfall information is summarized in the attached Table 2 and the outfall
locations are shown on the Proposed NPDES Outfalls diagram.
Outfalls 009, 010, 011 and 012 are located at the southeastern comer of the airport property and
drain to Ilorsepen Creek. None of these outfalls receive any runoff from PTAA or tenant
facilities. There are no building structures, no significant materials stored, and no industrial
activities conducted within these drainage areas. The area surrounding these outfalls is covered
with grass or other vegetation. Therefore, these specific outfalls have not been included in any
group chosen to undergo sampling for the NPDES Stormwater Permit Application.
GROUP 1- Outfalls 001, 002, 016a, 024, 025, 026
Outfalls 001, 002, 016a, 024, 025, and 026 are substantially identical in terms of industrial
activities, significant material stored outdoors, and stormwater management practices. These
outfalls all contain stormwater discharges associated with PTAA maintenance and operations.
-7-

Diesel fuel and/or gasoline is stored in each of these drainage areas, with the exception of Outfall
026, which contains stormwater runoff from the terminal's parking decks.
Outfalls 001 and 002 are located within the airfield near the northeastern comer of the airport
property- Outfalls 024, 025, and 026 are located northwest of the airport terminal. All five of
these outfalls are associated with PTAA storage and maintenance areas, in which gasoline and
diesel are stored in US i's. The majorities of the US i'''s are double walled tanks with interstitial
secondary containment and have catch basins at the fill port of the tank for containment of small
spills.
Parameters of concern for sampling during the NPDES storm water permit application are BTEX
(benzene, toluene, ethylbenzene, xylene), lead, isopropylbenzene, Methyl tertbutyl ether
(MTBE) and related polycyclic aiumatic hydiocarbotis (PAHs).
The parameters listed above are proposed to be sampled in addition to the parameters required to
be sampled, which are listed on the NPDES Permit Application and include pH, Oil and Grease,
Biological Oxygen Demand (BODS), Chemical Oxygen Demand (COD), Total Suspended
Solids (TSS), Total Kjeldahl Nitrogen (TKN), Nitrate plus Nitrite Nitrogen, and Total
Phosphorus.
GROUP 2 - OutWls 003, 004; 005, 008, 00, 017, 018, 019, 020
Outfalls 003, 004, 005, 008, 013, 017, 018, 019, and 020 are substantially identical in terms of
industrial activities, significant material storage, stormwater management practices, and runoff
coefficients.
These outfalls contain stormwater discharges from various airfield areas of the airport and
vegetated areas surrounding the airfields. There are no significant materials associated with any
of these outfalls, other than any materials that may be discharged to the runway surfaces from
aircraft or service vehicles. Although unlikely, glycols may enter the storm ,system from deicing
of paved surfaces. Stormwater management practices employed within these drainage areas
M

consist primarily of grass swales and subterranean drains. The estimated runoff coefficients for
these outfalls are substantially identical, ranging from 0.55 to 0.64.
Parameters that will be sampled for the NPDES storm water permit application are those
parameters required for all stormwater sampling events. In additional glycol will be tested to
ensure that if deicing activities occur, the materials are not mixing with the stormwater.
GROUP 3 - Outfalls 006, 007 and 016
Outfalls 006, 007, and 016 are substantially identical in terms of industrial activities, significant
material storage, stormwater management practices, and runoff coefficients. Each of these
outfalls contains stormwater discharges associated with aircraft maintenance, storage, and
refueling activities The tenants for these storage areas are TIMCO, CESSNA/Citation and
Tradewinds. Used oil and fuel storage (including Jet A fuel, gasoline, and diesel) is associated
with each of these outfalls.
Each of these outfalls drain areas that have stormwater/secondary containment ponds in place
that serve as storm water management control. Oil/water separators are used at
CESSNA/Citation to contain any spills from loading and storage areas. In addition, a 550-gallon:
oil/water separator would contain potential spills at the former U.S. Airways Maintenance
IIangar (currently operated by TIMCO). The estimated iuiioff coefficients fbr these three outfalls
are substantially identical, being 0.73, 0.62 and 0.70.
Parameters of concern potentially entering storm water discharges are BTEX, MTBE, and P AHs
related to oil and gasoline derivatives.
GROUP 4 - Outfalls 014, 015, 021, 022 and 023
Outfalls 014, 015, 021, 022, and 023 are substantially identical in terms of industrial activities,
significant material storage, structural controls, and flow. Each of these outfalls are associated
with areas where aircraft refueling, and large -quantity fuel storage and transfer activities are
M

conducted by the airport tenants, which include Atlantic Aero, Piedmont/Hawthorne, and
Burlington Industries.
Jet A fuel is the primary significant material stored within the drainage areas associated with
each of these outfalls. Jet A fuel is stored in volumes up to 30,000 gallons in underground
storage tanks, up to 20,000 gallons in aboveground storage tanks, and up to 9,000 gallons in
refueler tankers. Outfalis 014 and 015 (on property leased by Burlington Industries) contain
stormwater discharges associated with Jet A fiiel storage. Outfalls 021, 022 and 023 (on property
leased by Atlantic Aero and Piedmont/Hawthorne are associated with the storage of Jet A fool
and AVGAS, along with smaller quantities of gasoline and used oil. Jet A fuel and AVGAS are
stored in both underground and aboveground storage tanks, as well as in mobile refueling
tankers. Fill port catch basins and drainage swales are located within each of these drainage
areas. Both Atlantic Aero and Piedmont/Hawthorne employ Oil/water separators as an additional
structural control. The outfall drainage areas are substantially identical, ranging from 13.7 acres
to 17.7 acres, and the estimated runoff coefficients for these outfalls are also substantially
identical, ranging from 0.60 to 0.69.
Parameters of concern include the following: BTEX, MTBE, lead, isopropylbenzene,
naphthalene, fluorine, ethylene dibromide and 1,2-dichloroethane.
GROUP 5 Outfalls 027,028 and OZ2.
Outfalls 027, 028 and 032 are substantially identical in terms of industrial activities, significant
material storage, and stormwater management practices. All three outfalls are associated with
areas where large volumes of glycol (up to 20,000 gallons) are stored and/or used for deicing
activities.
One 20,000 gallon underground diesel storage tank is located at the Main Terminal and operated
by PTAA for emergency generator use. In addition, aircraft deicing activities are conducted in
this vicinity (within the Outfall 027 drainage area). Two USTs and two ASTs of poly-
glycol/propylene glycol, operated by various airlines are located at the southwest end of Cargo
-10-

Area #2 (within the Outfall 28 drainage area). Outfall 028 also contains storm water discharges
associated with significant material stored by Hertz Rent a Car, including gasoline, and new and
used oil. A mobile poly -glycol AST and 2-3 poly -glycol totes are stored near the Federal Express
building at Cargo Area #3 (within the Outfall 032 drainage area). In addition, Federal Express
also stores relatively small quantities of automatic transmission fluid and new and used oil in a
divided aboveground storage tank, while gasoline and used oil are stored by the airlines at Cargo
Area #2. The drainage area sizes are similar, ranging from 29 to 53 acres, and all three outfalls
eventually drain to Brush Creek.
Parameters of concern are ethylene glycol and propylene glycol, which are common components
of deicing fluid. The deicing fluids used are aqueous solutions of a glycol or glycols along with
proprietary additives (such as pH buffers, flame retardant, surfactants or dyes). In addition, lead,
BTEX, and PAHs will be tested in this area because of the gasoline and oil storage.
GROUP 6 - Outfalls 029, 030 and 031
Outfalls 029, 030, and 031 are substantially identical in terms of industrial activities, significant
material storage, stormwater management practices, and runoff coefficient.
These outfalls are all located in the northwestern part of the airport and drain areas associated
with the operation of car rental facilities Avis, National, Budget and Alamo car rental agencies
are all located within these drainage areas. Industrial activities conducted within each of these
drainage areas include vehicle refueling and maintenance. Storage for these tenants consists of
gasoline in USTs, and new and used oil, primarily stored in ASTs. Each of these facilities have
storage tank systems equipped with fill port catch basins to contain small spills. These outfalls
are similar in terms of flow. The estimated acres drained for the three outfalls ranges between 12
and 42 acres. The estimated runoff coefficients are substantially identical, ranging from 0.58 to
0,68 All three outfalls drain to Brush Creek.
The parameters of concern for this group of outfalls are BTE.X, oil related P AHs (flourono,
naphthalene, etc.), lead, MTBE, isopropylbenzene, and ethylene dibromide.
-11-

TABLE 1
PIEDMONT TRIAD INTERNATIONAL AIRPORT
STORMWATER RUNOFF COEFFICIENTS
Drainage
I
Area Drained
I
Impervious Area
Unpaved Area
I
Runoff
I
Outfall
Basin
(Acres)
(Acres)
(Acres)
Coefficient
Tenants
001
HP-5 (1)
111
2.5
108.5
0.51
PTAA/Airport Maintenance
002
HP-5 (1)
111
2.5
108.5
0.51
PTAA/Airport Maintenance
003
004
HP-4 (1)
HP-4 (1)
156
156
27
27
129
129
0 67
0.57
None
None
00b
11113
30
6
24
0.58
None
006
III1-0
45
20
19
0.73
11MC0
007
HP-1
HP-9
128
32
38.4
89.6
0.62
Cessna/Citation, TIMCO
None
008
4
28
0.55
009
HP-10
36
0.1
35.9
0.50
None
010
HP-13
6
0.2
5.8
0.51
None
011
HP-12
3
0.1
2.9
0.51
None
012
HP-11
3
0
3
0.50
None
013
DR-4 (1)
13.7
3.3
10.4
0.60
Burlington
Burlington
014
DR-4 (1)
13.7
3.3
10.4
0.60
015
DR-4 (1)
13.7
3.3
10.4
0.60
Burlington
016
DR-3
36
18
18
0.70
Tradewinds; PTAA
016a
DR-1
13.7
2.5
11.2
0.51
PTAA/Airport Maintenance
017
DR-1 (1)
40.5
13.5
27
0.63
None
018
DR-1 (1)
40.5
13.5
27
0.63
None
019
DR-2
17
6
11
0.64
None
020
BC-1
84
17
67
0.58
None
021
BC-2 (1)
17.7
8.3
9.4
0.69
Atlantic Aero; Piedmont/ Hawthorne
022
BC-2 (1)
17.7
8.3
9.4
0.69
Atlantic Aero; Piedmont/ Hawthorne
023
BC-2 (1)
17.7
8.3
9.4
0.69
Atlantic Aero; Piedmont/ Hawthorne
024
BC-3
56
9
47
0.56
PTAA
025
026
027
BC-5
t30-6
BC-7
'16
77
53
10.5
10 r
31
2.5
7 5
22
0.82
0.70
0.73
PTAA
None (P rlung Ueol(b)
PTAA
028
BC-8
29
4
25
0.56
Hertz; PTAA; United Airlines;
Continental Airlines; US Airways
029
BC-10
12
2.5
9.5
0.58
Avis
030
BC-9
42
19
23
0.68
Continental Air Cargo Bldg.
031
BC-11
19
4.5
14.5
0.59
Alamo; Budget; National
032
BC-12
35
6
29
0.57
Federal Express
(1) - Total drainage area and total impervious area divided equally between outfalls within the same drainage basin.

TABLE 2
PIEDMONT TRIAD INTERNATIONAL AIRPORT
STORMWATER OUTFALL SUMMARY
Estimated
Area Drained
Significant Materials
Stormwater Management
Runoff
Outfalls
Location
(acres)
Stored
Practices
Coefficients
PTAA storage and maintantence areas with substantially identical industrial activities, significant material stored, and storm
water management practices.
001
Horsepen Creek
111
Gaasoline, Now/llsied oil,
Diesel
Fill Fort catch basin, Plafined
stormwater management pond
0.51
002
Horsepen Creek
111
Gasoline, NewAlsed oil,
Diesel
Fill Port catch basin; Planned
stormwater management pond
0.51
016a
Deep River
13.7
Gasoline, Now/Used oil,
Diesel
Fill Port oatch basin; Planned
stormwater management pond
0.51
024
Brush Creek
56
Diesel
None
0.56
025
Brush Creek
13
Gasoline
Fill Port catch basin
0.82
026
Brush Creek
27
None (parking decks)
Fill Port catch basin
0.79
Airfield/grass area runoff only (no significant materials stored) with substantially Identical storm water management
practices, and runoff coefficients.
003
Horsepen Creek
156
Airfield runoff
Grass swales
0.57
004
Horsepen Creek
156
Airfield runoff
Grass swales
0.57
005
Horsepen Creek
30
Airfield runoff
Grass swales
0.58
008
Horsepen Creek
32
Airfield runoff
Grass swales
0.55
013
Deep River
13.7
Airfield/road runoff
Grass swales
0.6
017
Deep River
40.5
Airfield runoff
Grass swales
0.63
018
Deep River
40.5
Airfield runoff
Grass swales
0.63
019
Deep River
17
Airfield runoff
Grass swales; Oil/Water
separator
0.64
020
Brush Creek
84
Airfield runoff
Grass swales
0.58
Crass area runoff only (no industrial activities or significant materials stored)
UGH
1 lorsepen (:reek
sG
Non€+
Norio
O.bG
010
Horsepen Creek
6
None
None
0.51
011
Horsepen Creek
3
None
None
0.51
012
Horsepen Creek
3
None
None
0.5
Substantially identical industrial activities (aircraft maintenance, storage, and refueling), significant material storage,
stormwater management practices, and runoff coefficients.
Fill port catch basins; Secondary
Diesel, Used Oil,
containment pallets; Stormwater
006
Horsepen Creek
45
Gasoline
Collection Pond (EP-4)
0.73
Fill port catch basins; Oil/water
separators; Stormwater
007
Horsepen Creek
128
Jet A Fuel, Used Oil
Management Pond (EP-3)
0.62
Secondary Containment Pond
016
Horsepen Creek
36
Used Oil, Diesel
(DR-3)
0.70

Area Drained
Significant Materials
Storm Water Management
Runoff
Outfall
Location
(acres)
Stored
Practices
Coefficient
Substantially identical industrial activities (aircraft refueling, fuel storage and transfer), significant material storage,
stormwater management practices, and flow.
Fill port catch basin; Drainage
swale with manually -operated
014
Deep River
13.7
Jet A Fuel
valve
0.60
I III port catch basin; Diainagra
swale with manually -operated
015
Deep River
13.7
Jot A Fuel
valve
0.00
Jet A Fuel, AV Gas,
Secondary containment dikes;
021
firL144l Ore-e-k
177
G;owlinro, Now/t lr od Oil
OII/wator separators
0.69
Jet A Fuel, AV Gas,
Secondary containment dikes;
022
Brush Creek
17.7
Gasoline, New/Used Oil
Oil/water separators
0.69
Jet A Fuel, AV Gas,
Secondary containment dikes;
023
Brush Creek
17.7
Gasoline, New/Used Oil
Oil/water separators
0.69
Substantially identical industrial activities (aircraft deicing), significant material storage (diesel/oil storage in double -walled
tanks and deicing fluids). and drainage area size.
027
Brush Creek
53
Diesel, Glycol
Fill port catch basin; Planned
stormwater management pond
0.73
Poly -Glycol, Propylene
Glycol, Gasoline,
Fill Port catch basin; Secondary
New/Used Oil, Diesel,
containment pallet; Planned
028
Brush Creek
29
Fuel Oil No. 2
stormwater management pond
0.56
Planned stormwater
032
Brush Creek
35
Used Oil. Glycol
management pond
0.57
Substantially identical industrial activities (car rental refueling and maintanence), significant materials stored, stormwater
management practices, and flow
Fill Port catch basin; Planned
029
Brush Orsek
12
Gasoline, New/Used Oil
stormwater managemont pond
Fill Port catch basin; Planned
0.58
030
Brush Creek
42
New/Used Oil
stormwater ranagement pond
0.68
Fill Port catch basin; Planned
031
Brush Creek
19
Gasoline, New/Used Oil
stormwater management pond
0 59

Certification
Below is a certification that all groupings of outfalls have been examined and certified as
substantially identical outfalls according to the criteria established in the narrative described.
"I certify under penalty of law that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted, Lased on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief; true, accurate
and complete. I am aware that there are significant. penalties for submitting false information,
including the possibility of fine and imprisonment for knowing violations" [as per 40 CFR
122.22(d)]
Signature
Date
-12-