NCS000508_APPLICATION_20140611

STORMWATER DIVISION CODING SHEET
PERMIT NO. NL S D 00S-vb
DOC TYPE
DOC DATE
❑ FINAL PERMIT
❑ MONITORING INFO
APPLICATION
❑ COMPLIANCE
❑ OTHER
❑ )bl(,l06)1
YYYYM M D D

Taylor -Smith, Aana
From: Richard Darling <[e-mail]>
Sent: Wednesday, June 11, 2014 11:40 AM
To: Taylor -Smith, Aana
Subject: RE: PTIA NPDES Stormwater Permit
Thanks Aana.
The PTIA NPDES expires mid 2015, so we plan application for renewal at the end of this year. Will you be the
appropriate contact for questions as I begin compiling the application package?
From: Taylor -Smith, Aana [[e-mail]]
Sent: Wednesday, June 11, 2014 11:36 AM
To: Richard Darling
Subject: RE: PTIA NPDES Stormwater Permit
Richard,
That explains it! Glad the email got through, though. The technicians who measure pH and DO directly during field
sampling for the NPDES stormwater permit do not have to be field certified, but they do have to follow EPA standards.
Litmus strips are not acceptable, but pH meters and DO meters (or multimeters) are fine.
Keep in mind, if you are ever dealing with wastewater permits, technicians for wastewater sampling do have to be field
certified and samples must be sent to a certified lab.
Thanks!
Aana Taylor -Smith
Land Quality Section
Division of Energy, Mineral, and Land Resources
NC DENR Winston-Salem Regional Office
Phone: [phone]
Fax [phone]
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to
third parties.
From: Richard Darling[mailto:RDarlina(dmbakerintl.com]
Sent: Wednesday, June 11, 2014 11:32 AM
To: Taylor -Smith, Aana
Subject: RE: PTIA NPDES Stormwater Permit
Thanks Aana - got it - my follow-up question relates to the laboratory field vs. non field certifcation at
http://Dortal.ncdenr.org/web/wg/lab/ce . Do technicians who measure pH and D.O. directly during field sampling need
to be field certified? Thanks for your quick response - we are totally off-line at work this morning (including phones), so
the connection problem is on our end. I am working from home the rest of the day, so I can get my e-mail from here.
Richard
mobile [phone]

From: Taylor -Smith, Aana [[e-mail]]
Sent: Wednesday, June 11, 2014 10:48 AM
To: Richard Darling
Subject: PTIA NPDES Stormwater Permit
Hi Richard,
I tried to call you on the phone earlier but it seems like we may be having some sort of issue with our system so it
wouldn't go through. Anyway, I got your message from yesterday — sorry I missed you! Piedmont Triad Internationa
Airport's NPDES stormwater permit does not require that sampling be done by a certified lab. However, procedures
must conform to 40 CFR 136, which are the EPA guidelines for analysis
(http://www.epa.gov/region9/oa/pdfs/40cfrl36 03.pdf).
If you look at Part III, Section D, Paragraph 4 of the PTIA permit, it spells out all of the exact regulations in the NC code as
well (should be at the bottom of page 5 of Part III). 1 know that can be confusing to find! Usually we send out a technical
bulletin with the NPDES general permits, but because PTIA has an individual permit, they probably didn't get one.
Hope that helps! If you have any further questions or concerns, please don't hesitate to contact me.
Best,
Aana Taylor -Smith
Land Quality Section
Division of Energy, Mineral, and Land Resources
NC DENR Winston-Salem Regional Office
Phone: [phone]
Fax [phone]
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to
third parties.

Mr. Kevin Baker
Piedmont Triad International Airport
Permit No. NCS000508
the outfalls have been Inspected to ensure that they do not contain non-stormwater discharges.
Additional information is provided in Part II Section A.
2. Additional requirements for the Stormwater Management Plan have been specified in Part II Section A.
More details regarding secondary containment are provided.
3. Additional requirements for the Stormwater Pollution Prevention Plan have been specified In Part II
Section A. The plan must also be updated annually to include a list of significant spills and to certify
that the outfalls do not contain non-stormwater discharges.
4. The facility must now implement a semi-annual Facility Inspection Program of the site's stormwater
management controls as specified in Part II Section A.
5. In addition to submitting two signed copies of DMRs to Central Files, a separate signed Annual
Summary DMR copy must be submitted to the Winston-Salem Regional Office by March 1 of each year.
Please submit any comments to my attention no later than thirty (30) days following your receipt of the
draft. If no adverse comments are received from the public or you, this permit will likely be issued
approximately two months.
If you have any questions or comments concerning this draft permit, contact me at [phone] or
[e-mail].
Sincerely,
Co arse_
Environmental Engineer
Stormwater Permitting Unit
cc: Winston-Salem Regional Office, Corey Basinger
Central Files
Stormwater Permitting Unit
Attachments

611'
r5f R
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
January 13, 2010
Mr. Kevin J. Baker
Piedmont Triad Airport Authority
PO Box 35445
Greensboro, NC 27425
Dear Mr. Baker:
Dee Freeman
Secretary
JAN 1 9 2010
Wi ratonSalem
Reglonalt nce
Subject: Draft NPDES Stormwater Permit
Permit No. NCS000508
Piedmont Triad International Airport
Guilford County
Enclosed with this letter is a copy of the draft stormwater permit for your facility. Please review the draft
very carefully to ensure thorough understanding of the conditions and requirements it contains.
The draft permit contains the following significant changes from this facility's current permit:
Analytical monitoring changes:
1. New analytical monitoring parameters have been added to this permit.
2. One representative stormwater discharge outfall (SDO) has been added and one representative SOD
location has been changed. Three In -stream sampling locations have been eliminated.
3. Benchmarks for analytical monitoring have been added to this draft permit. Exceedances of
benchmark values require the permittee to Increase monitoring, increase management actions,
Increase record keeping, and/or Install stormwater Best Management Practices (BMPs) in a tiered
program. If the sampling results are above a benchmark value, or outside of the benchmark range, for
any parameter at any outfall then the facility shall follow the Tier 1 guidelines which require a facility
inspection within two weeks and implementation of a mitigation plan within two months. If during the
term of this permit, the sampling results are above the benchmark values, or outside of the benchmark
range, for any specific parameter at a specific discharge outfall two times in a row (consecutive), then
the facility shall follow the Tier 2 guidelines which require a repetition of the steps listed for Tier 1 and
also immediately institute monthly monitoring for all parameters at every outfall where a sampling
result exceeded the benchmark value for two consecutive samples.
4. De -Icing event analytical monitoring and in -stream monitoring has been reduced from every event to
four (4) qualifying events per year.
5. Acute toxicity analyses shall be performed with Ceriodaphn/a dubia instead of Pimephaies prome/as.
6. The flow reporting requirement has been removed per DWQ revised strategy. (The total rainfall
parameter is in this permit, however.)
Other permit changes:
1. Additional guidance is provided about the Site Plan requirements. The site map must now identify if
the receiving stream is impaired and if it has a TMDL established. It must also describe potential
pollutants in each outfall. The map requirements are stated more explicitly. And, the site plan must
contain a list of significant spills that have occurred in the past three years and also must certify that
Wetlands and Slormwater Branch
One
1617 Mail Service Center, Raleigh, North Carolina 27699.1617
N ,�j, Carolina
�,y/"f�,/N����
Phone: [phone] FAX: [phone] Customer Serve: 1-677-623-6746
Phoaeon:5.8 N. Salisbury St. Rale19-807, North Carolina r Service:
Internet: www.ncwaterquality.org
f7/�j/{z [-[`
An Equal opportunity \ Alfinnalive Acton Employer

Homewood, Sue
From: Darling, Richard [[e-mail]]
Sent: Thursday, December 08, 2011 9:53 AM
To: Homewood, Sue
Cc: White, Joshua
Subject: Piedmont Triad International Airport NPDES Individual Permit NCS000508
Attachments: image001.gif; image002.9if-, image003.gif, image004.gif; image005.png; Tierl-1.pdf;
PTAA_NPDES_Clarification.docx; PTIA—SamplingLocationMap.pdf
Sue
Per our telephone conversation yesterday, attached please find the draft letter requesting clarification of the subject
permit regarding follow-up investigations required for each exceedance of the 50 NTU turbidity benchmark at in -stream
locations. As discussed, the permit requirement for investigation of turbidity exceedances at the in -stream locations
which are not due to any activity at PTIA (i.e. there is no turbidity exceedance at any of the PTIA Stormwater Discharge
Outfalls) would not appear consistent with the intent of the permit. It is further anticipated that these investigations
will consistently result in a recommendation of "no action" because the turbidity appears to result from the natural
sediment loading increase due to the high flow condition — the sampling is only performed after at least 0.1" rain event.
Also attached to this e-mail are the Technical Memorandum documenting the first investigation of in -stream turbidity
benchmark exceedance, and a map depicting the approximate monitoring locations. Ken Pickle concurred that your
assistance in clarifying this NPDES Permit issue would be important because of the potential for recommendation that
in -stream turbidity benchmark exceedances be addressed by a streambank stabilization project. Any insight you could
provide to Ken regarding the various protective wetland, stream, and buffer regulations, permits, easements, and
programs applicable at PTIA versus the actual need for any specific bank stabilization in the vicinity of any of the
monitoring locations would be greatly appreciated. It may well be that 50 NTU (or even greater) represents a "natural'
and potentially acceptable turbidity for these in -stream locations after>1" rain?
Richard
Richard B. Darling I Environmental Manager I Michael Baker Engineering
7800 Airport Center Drive, Suite 100 1 Greensboro, NC 27409 1 336.931.1500 (office) 1 336.662.4249 (direct)
rdarlina(almbakercoro.com I www.mbakercorp.com
Connect with Baker on:
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Technical Memorandum
DATE: December 1, 2011
TO: Mickie Elmore (Piedmont Triad Airport Authority)
COPY: B.J. Lineback (ECS Carolinas LLP);
File 104066 / 0338
FROM: Richard Darling Oft
SUBJECT: NPDES Permit NCS000508 Stormwater Management Inspection
In compliance with the subject National Pollutant Discharge Elimination System (NPDES) individual
permit issued by the North Carolina Department of Environment and Natural Resources (NCDENR) to
the Piedmont Triad Airport Authority (PTAA), a stormwater management inspection was conducted at
in -stream (IS) locations due to turbidity sampling results detected above benchmark values. NPDES
Permit NCS000508 specifies the following "Tier One' response:
_ 'I ier One
If: The first valid sampling results are above a benchmark value, or outside of the benchmark range, for any
parameter at any outfa8 or in -stream location;
Then: The permittee shall:
1. Conduct a stormwater management inspection of the facility within two weeks of receiving
sampling results.
2. Identify and evaluate possible causes of the benchmark value exceedance.
3. Identify potential source controls, operational controls, or physical improvements, if any, that could
reduce the difference between the sampling results and the benchmark value and select any such
corrective measure or combination of corrective measures that the permittee determines to be
appropriate and warranted, after due consideration of the cause and nature of the execedance and the
feasibility, cost and effectiveness of -such measures.
4. Implement the selected actions, if any, within two months of the inspection, or as soon thereafter
as reasonably possible.
5. Recoid each instance of a Tier One response in the Stormwater Pollution Prevention Plan. Include
the date and value of the benchmark exceedance, the inspection date, the personnel conducting the
inspection, the selected actions, if any, and the date the selected actions were implemented, or, if no
action was implemented, the basis for that decision.
On November 22, 2011, Michael Baker Engineering, Inc. (BAKER) was notified that the November 4
de-icing event analytical monitoring included results above benchmark values at IS#02, IS#05, IS#06, and
IS#10 for turbidity. The November 4 sampling was mandated by the application of 280 gallons of aircraft
de-icing fluid (ADF) on November 1, preceding a 0.53-inch precipitation event on November 3, 2011
(and 1.51 inches on November 4). Documentation (attached) of these results was provided on
December 1, 2011.
On November 28, 2011, BAKER (Richard Darling) completed a stormwater management inspection at
the in -stream locations where benchmark exceedances were detected, as follows:
Page 1 of 2

Technical Memorandum NPDES Permit NCS000508
IS#02
Issue: Turbidity 51.43 NTU (benchmark 50)
Possible Causes: Over two inches rain in two-day period resulting in stream -bank erosion.
This in -stream sampling location is at Brush Creek near the pump station off Airport Parkway. Recent
alluvial deposits and depositional bars were observed on November 28 upstream of the sampling point.
Fine sediment was also observed on the inner surfaces of the 3-barrel box culvert at this location.
IS#05
Issue: Turbidity 152.5NTU (benchmark50)
Possible Causes: Over two inches rain in two-day period resulting in stream -bank erosion.
This in -stream sampling location is at Brush Creek between the Federal Express facility and Ted Johnson
Parkway. Water was observed both pooled and flowing in the numerous channels of Brush Creek
upstream of this location. Large areas of the floodplain here appeared recently flooded.
IS#06
Issue: Turbidity 89.43 NTU (benchmark 50)
Possible Causes: Over two inches rain in two-day period resulting in stream -bank erosion.
This in -stream sampling location is at Brush Creek where it leaves airport property. The creek is deeply
incised in this immediate vicinity and large portions of the banks are actively eroding and in various
stages of collapse.
IS#10
Issue: Turbidity 67.75NTU (benchmark SO)
Possible Causes: Over two inches rain in two-day period resulting in stream -bank erosion.
This in -stream sampling location is at an unnamed tributary to Horsepen Creek, where it is crossed by
Ballinger Road near the Honda Aircraft Company facility. An area of bank upstream of the Ballinger
double culvert is undercut and actively eroding.
Selected Action
Due to an apparent lack of operational controls or physical improvements available to PTAA and/or
co-permittees, the "selected action" for all of the in -stream locations is to continue to observe the
eroding stream -banks and notify the United States Army Corps of Engineers and the NCDENR Division of
Water Quality, who exert jurisdiction over the streams and Lake Jordan basin riparian protection zones
at the Airport, of appropriate restoration opportunity. Due to anticipated consistent future
exceedances of the turbidity benchmark in the IS locations, a permit modification request is
recommended. This will be documented in the next annual update of the Airport's Stormwater
Pollution Prevention Plan (SPPP).
Attachments
1. Field Sampling Sheet for PTIA November 4 2011 De -Icing Event Analytical Monitoring.
II10.10.60.51gopcb110a0661�38_NPOF51Compllance110]]-33 RrzPorueslTNtl-t.doa
Page 2 of 2 December 1, 2011

Field Sampling Sheet
STORMWATER ANALYTICAL RESULTS
Field Sheet
Project Name: Piedmont Triad International Airport
mg4 a milligrams per liter
NTU - Nephebmelric Turbidlly Units
TPH = total petroleum hydrocarbons
- = Not Requested
NS=Not Sampled
'Bold rotes exceedance of benchmark value

December -57, 2011
North Carolina Department of Environment and
Natural Resources; Division of Water Quality;
Stormwater Permitting Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Attention: Mr. Ken Pickle, Stormwater Engineer
Subject NPDES Individual Permit NCS000508
Piedmont Triad International Airport
Dear Mr. Pickle:
Persuant to your telephone discussion of December-5, 2011, with Richard Darling of Michael Baker
Engineering, and on behalf of the Piedmont Triad Airport Authority (PTAA) and NCS000508 Co-Permittees, I
am providing information updates and requesting clarification of the Airport's NPDES Individual Permit. I
understand that the following six items represent simple updates to the permit for your information and have
been documented in the most recent update of the Airport's Stormwater Pollution Prevention Plan (SPPP):
1. The DollarlThri)�y Rental Car (listed as a co-permittee) facility was not included in the SPPP because
this facility is not located on the Airport
2. Tradewinds (listed co-permittee) have changed their name to Sky Lease Cargo
3. Champion Cartage, Northwest Airlines, Premier Transportation, and Smartecarte (listed co-
permittees) were not included in the SPPP because they no longer operate facilities at the Airport
4. The Aviation Repair Technologies; Prime Flight Services; Quantem Aviation Services, Inc.; Triad
Transportation; and Worldwide Flight Services facilities (listed co-permittees) were not be included in
the SPPP because they present no opportunity for potential stormwater pollution
5. Two new PTIA Airport tenants, Jetstar Aviation (located in Cargo Building 2) and Dynamic Airway
(located in the previous EmerylMenlol UPS facility), have been added to the SPPP
6. Two additional Stormwater Discharge Outfalls (SDOs) (040 and 040A, represented by SDO 004) are
now functioning due to completion of the existing Honda Aircr Company facility - these SDO's are
proposed to be included in the qualitative monitoring schedule
Up to three potential future SDOs (068, 069, and 070, also represented by SDO 004) may be added to
the qualitative monitoring schedule due to proposed expansion of the Honda Aircrgq Company facility
once this project is completed (currently anticipated September 2012)
The following is a request for clarification of the NPDES Permit monitoring requirements involving the recently
instigated turbidity benchmark of 50 NTU:

December 7, 2011 ^__,,.-,,._-, 2Q 1 E)eee beF 2011
Mr. Ken Pickle
Page 2 of 2
The turbidity benchmark of 50 NTU was instigated on July 1, 2011 but application to the In -Stream (IS)
monitoring locations (IS#O 1 through IS# 11) may be not be appropriate because these streams appear to
routinely experience turbidities greater than 50 NTU following significant rain events due to streambank
erosion, over which PTAA and co-permittees have no control. The turbidity benchmark was not exceeded at
any of the monitored SDOs. It is our understanding that the permit was not intended to require permittees to
address issues over which they have no immediate control. NCS000508 Part II Page 10 of 13 states "If the
inspection and evaluation of a particular sampling result under Tier One or Tier Two show that the result is not
caused by the permittee's operations or facilities, it will not be treated as a benchmark exceedance for purposes
of determining whether four consecutive exceedances have occurred." We are therefore requesting clarification
that the Tier One response requirement of"...any parameter at any outfall or in -stream location..."(NCS000508
Part II Page 9 of 13) be clarified to exclude the turbidity benchmark at in -stream locations.
While there has been only one monitoring (November 4, 2011 De -Icing Event) to -date where the turbidity
benchmark has been applicable, the recommended action from the Tier One response required was to request
clarification of this permit requirement. It is anticipated that, without such clarification, turbidity benchmark
exceedances will be recorded at in -stream locations for future monitoring events precipitating the tiered
response stormwater inspections with "no -action" consistently the only feasible recommendation.
We look forward to working together to ensure continued permit and regulatory compliance at Piedmont Triad
International Airport. Please feel free to contact me or Richard Darling at 919-459-9009 with any questions or
comments.
Sincerely,
PIEDMONT TRIAD AIRPORT AUTHORITY
Mickie L. Elmore
Director of Development
cc: Sue Homewood; NCDENR WSRO
Richard Darling; Michael Baker Engineering
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April 18, 2012
North Carolina Department of Environment and
Natural Resources; Division of Water Quality;
Stormwater Permitting Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Attention: Mr. Ken Pickle, Stormwater Engineer
Subject: NPDES Individual Permit NCS000508
Piedmont Triad International Airport
Dear Mr. Pickle:
RECEIVED
N.C.Dept. of ENR
JUN 11 2012
Winston-Salem
Regional Office
Thank you for your e-mail response of March 22, 2012 to my previous letter and your discussion
with Richard Darling on March 28, 2012. Based on this response and additional review of the
current field sampling locations for the Stormwater Discharge Outfalls (SDOs), the Piedmont
Triad Airport Authority and NPDES NCS000508 co-permittees propose some logical
adjustments. Apparently some of the locations and numbering of stormwater management
features presented in the 2010 NPDES permit renewal were based on inlet pipes to
retention/detention ponds and/or sediment traps. The applicable qualitative SDO sampling
locations (Map 1) would seem to more appropriately be designated at the outfalls to these
features. The following adjustments to the qualitative sampling locations are proposed:
• Location 32 has been sampled at the FedEx No 1 Pond inlet pipe; it is proposed to be
relocated to the FedEx No. 1 Pond outfall as SDO 032 (Map 2).
• Location 34 has been sampled at the second of the two FedEx No. 2 Pond inlets; it will
be eliminated because SDO 033 has been sampled at the FedEx No. 2 Pond outfall
(Map 3).
• Similarly, locations 35 and 37 will be eliminated because SDO 036 is sampled at the
FedEx No. 3 Pond outfall (Map 4).
• Similarly, location 39 will be eliminated because SDO 038 is sampled at the Honda No. 1
Pond outfall (Map 5).
• Locations 63, 64, and 65 will be eliminated because SDO 028 is sampled at the pond
outfall to which these pipes inlet (Map 6).
• Locations 66 and 67 will be eliminated because SDO 029 is sampled at the pond outfall
to which these pipes inlet (Map 7).
1000 A. Ted Johnson Parkway, Greensboro, NC 27409, 336-665-5600

April 18, 2012
Mr. Ken Pickle
Page 2 of 2
The following adjustments are also proposed based on further field investigation:
• SDO 003 is proposed to be relocated downstream as it is incorporated into the Honda
facility expansion site. When the new outfall is completed, anticipated September 2012,
the sampling point will be relocated here (Map 8).
• Erosion and channel stability issues have recently been identified at SDO 16A. Proposed
repair and stabilization will be added to the list of previously identified repairs (Map 9).
• SDO 021 and SDO 022 were reconfigured during construction of the new runway and
this drainage is currently channeled to SDO 020 and SDO 023 respectively. SDO 021
and SDO 022 no longer exist and are proposed to be eliminated from the sampling
program (Map 10, Map 11).
Consistent with the rationale of sampling at final discharge points rather than at locations within
the stormwater management system, leading to the adjustments proposed above, the list of SDO
locations proposed to be added to the NPDES monitoring program pending applicable future site
development will be based on the actual location of the outfalls, not inlets to retention/detention
ponds or sediment traps. The originally proposed twenty-three locations numbered 41 through
61 will actually correspond to eleven SDOs. These are proposed to be numbered 041 through
051 consecutively. The maps depicting the numbered SDO locations [Figures 1 and 2 in the
2011 PTIA Stormwater Pollution Prevention Plan (SPPP) update] will be revised accordingly in
the 2012 SPPP update along with a summary of the adjustments and rationale.
We look forward to working together to ensure continued permit and regulatory compliance at
Piedmont Triad International Airport. Please feel free to contact me or Richard Darling at
919-481-5740 with any questions or comments.
Sincerely,
PIEDMONT TRIAD AIRPORT AUTHORITY
of Development
RBD/JAR/LJA/MLE:rbd
Enclosures: 2010 Aerial Photographs of Proposed Adjustments to Qualitative Sampling
Locations (11 pages)
cc: Sue Homewood; DWQ-WSRO
Richard Darling; BAKER

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Map 2. Location 32 to be Relocated from FedEx Pond 1 Inlet to SDO032
Piedmont Triad International Airport March 28, 2012
Stormwater Pollution Prevention Plan Sheet 2 of 11 8evised SDO Monitoring Locations

Map 3. Sampling Location 34 (Inlet) to be Eliminated due to SDO033 sampled
atFedEx Pond 2 Outfall
Piedmont Triad International Airport March 28, 2012
Stormwater Pollution Prevention Plan Sheet 3of 11 Revised SDO Monitoring Locations

Map 4. Sampling Locations 35 and 37 (Inlets) to be Eliminated due to SDO036
sampled at FedEx Pond 3 Outfall
Piedmont Triad International Airport March 2$1011
Stormwoter Pollution Prevention Plan Sheet 4 of 11 Revised SDO Monitoring Locations

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Map 6. Sampling Location 63, 64, and 6S (Pipes) to be Eliminated due to
SDO028 sampled at Pond Outfall
Piedmont Triad lnternationalAirport March 28,2012
Stormwater Pollution Prevention Plan Sheet 6 of 11 Revised SDO Monitoring Locations

Map 7. Sampling Location 66 and 67 (Inlets) to be Eliminated due to SDO029
sampled at Pond Outfall
Piedmont Triad Internationol Airport March 18, 2011
Stormwater Pollution Prevention Plan Sheet 7 of 11 Revised SDO Monitoring Locations

Map 8. SD0003 Proposed to be Relocated Downstream after Integration with
Honda Expansion site
Piedmont Triad International Airport March 28, 2012
Stormwater Pollution Prevention Plan Sheet 8 of 11 Revised SDO Monitoring Locations

i
Former SDO 021
Location (approximate)
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Map 10. SDO021 No Longer Exists (Flow Re -Routed to SDO020) Sampling
Location Eliminated
Piedmont Triad International Airport March 28, 2012
Stormwater Pollution Prevention Plan Sheet 10 of 11 Revised SDO Monitoring Locations

Map 11. SD0022 No Longer Exists (Flow Re -Routed to SDO023) Sampling
Location Eliminated
Piedmont Triad International Airport March 28, 2012
Stormwater Pollution Prevention Plan Sheet 11 of 11 Revised SOO Monitoring Locations

Basinger, Corey
From: Basinger, Corey
Sent: Wednesday, May 30, 2012 8:38 AM
To: '[e-mail]'
Cc: Mickey, Mike; Homewood, Sue
Subject: Piedmont Triad International Airport project (Greensboro, NC)
Karen,
Staff have reviewed your correspondence dated May 17, 2012 regarding the subject project.
As per the documentation, no impacts to wetlands or streams will occur and the proposed project will not disturb more
than one (1) acre of land.
Based on this information, no new permits will be required.
I would suggest that the stormwater permit (NCS000508) be reviewed and any modifications/changes/corrections be
incorporated into the supporting documentation.
Should you have any questions/comments, please contact me at 336-771-5000.
Thanks.
Corey
W. Corey Basinger
Regional Supervisor
Surface Water Protection Section
Winston-Salem Regional Office
Division of Water Quality
Email: corev.basinger@ncdennizov
Phone: [phone]
Fax [phone]
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to
third parties.

TSSC-111 Southern Region Office
100 Hartsfield Centre Parkway, Suite 540 • Atlanta, Georgia 30354 • (404) 766-1
May 17, 2012
N.C. Division of Water Quality
Corey Basinger
Surface Water Protection Supervisor
585 Waughtown Street
Winston-Salem, NC 27107-2241
N.C.DepL of ENR
MAY 18 2019
Subject: Environmental Assessment for the Installation of a Glide Slope (GS) and a Localizer
(LOC) at Runway 32, Piedmont -Triad International Airport (GSO), Greensboro, North
Carolina.
On behalf of the Federal Aviation Administration (FAA), Parsons is preparing an
environmental assessment for the proposed construction, operation, and maintenance of a Glide
Slope (GS) and a Localizer (LOC) at Runway 32, Greensboro, North Carolina. The proposed
system would replace the existing Runway 14 Instrument Landing System (ILS).
The purpose of this letter is to request comments from your agency, which may have a duty
or an interest to consult on this project proposed by the FAA. In accordance with the National
Environmental Policy Act (NEPA), this letter will serve as a preliminary inquiry regarding any
potential, adverse impacts on air, land, water, wildlife, and/or other environmental and social
resources as a result of the project. The information provided in your response will be
incorporated into the EA, which will be submitted to FAA for review.
Your assistance in this matter and your prompt reply are greatly appreciated. Please provide
your comments to me at the address at the top of this page. If no response is received within 30
calendar days, it will be assumed that this project does not impact your area of jurisdiction. If
you have any questions, please contact me at [phone] or Karen.ctr.DorrOlafaa.eov.
Sincerely,
Karen Dorrell
Attachments: 1. Project Description
2. Project Location
3. Site Plan
C:\Environmenta1\WR448 ILS Greensboro NC\03 - Environnnental\EA\Agency Consultation Letters\DWQ LetterA

Piedmont - Triad International Airport LOC and GS
ATTACHMENT 1
PROJECT DESCRIPTION
The Localizer Antenna (LOC) is an array of six-foot tall antennas used to provide
lateral guidance to aircraft during an approach procedure. The LOC antenna array
radiates two different signals, which are used by the pilot to establish and maintain the
aircraft's horizontal direction until visual contact is made with the runway. The
horizontal guidance information indicates to the pilot whether the aircraft is to the right
of, left of, or aligned with the runway centerline. The signals are usable from an altitude
of 1,000 feet to 4,500 feet above the antenna site to a distance of 18 nautical miles (NM).
Reliable indications of being off course to the left or right can be received at 35' on either
side of the runway centerline to a distance of 10 NM and 10' on either side of the runway
centerline to a distance of 18 NM.
The proposed offset LOC for the Piedmont -Triad International Airport is a
14-element array, which has seven pairs of matched loop antennas. The antennas are
mounted on individual pairs of concrete piers. Each antenna is protected by a fiberglass
radome that increases the overall height of the array to approximately 5.5 feet above the
top of the foundation piers. A 10-foot by 16-foot shelter would house the equipment for
the LOC and would be located approximately 80 feet from the LOC. The trench for
power and control cables will likely be routed in a southwesterly direction to the Runway
05 Approach Lighting System (ALSF) Shelter power source.
The Glide Slope (GS) consists of a glide slope antenna, a monitor antenna, and an
equipment shelter. The glide slope provides an electronic signal received by equipment
in the aircraft. The signal is converted into a needle indication that tells the pilot whether
the aircraft is on the appropriate angle of decent for approach and touchdown, or that it
must fly up or down to be on the appropriate path. A 10-foot by 8-foot shelter would be
located near the antennas. The design would include a gravel driveway that connects to
the existing gravel access road. The trench for the power and control cables will be
routed in a northeasterly direction to an existing power pole.
The proposed work including the trenching locations would not result in impacts to
wetlands or streams. In addition the proposed project would not disturb more than one
acre of land. Best management practices would be utilized to minimize storm water
runoff from open construction areas.
C:\Environmental\WR4481L5 Greensboro NC\03 - EnvironmentahEA\Agency Consultation LettersWAuachments for Agency
Lehccdoc

Piedmont - Triad International Airport LOC and GS
ATTACHMENT 2
PROJECT LOCATION
The airport is located in Guilford County in northern North Carolina along Interstate
40, approximately 10 miles northwest of downtown Greensboro. The Runway 32
centerline at the threshold is located at 36' 05' 13.4" north latitude and 79' 56' 13.9"
west longitude. The elevation at the Runway 32 threshold is 898 feet above mean sea
level (amsl).
The Localizer and Glide Slope, which function as a navigational guidance system for
pilots of incoming aircraft under a wide range of weather conditions, would be placed at a
separate location on airport property. The locations of the components are shown in
Attachment 3 and described below.
Localizer Antenna (LOC) and Equipment Shelter
The proposed location of the offset LOC array for Runway 32 is approximately 200
feet east of the Runway 14 threshold and 320 feet north of the runway centerline. This
location meets the standards set forth in FAA Order 6750.16D, Siting Criteria for
Instrument Landing Systems. The proposed location of the LOC shelter for Runway 32
will be located outside the localizer critical area and runway safety area.
Glide Slope (GS) and Shelter
The proposed location of the GS and shelter will be approximately 1,007 feet west of
the runway threshold, 520 feet north of the runway centerline, and outside of the runway
object free area (ROFA). The location for the GS antennas meets the standards set forth
in FAA Order 6750.16D
C:\Environmental\WR448 ILS Greensboro N003 - Environmental\EA\Agency Consultation Letters\Attachments for Agency
Letter.doc

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April 18, 2012
North Carolina Department of Enviromnent and
Natural Resources; Division of Water Quality;
Stormwater Permitting Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Attention: Mr, Ken Pickle, Stormwater Engineer
Subject: NPDES Individual Permit NCS000508
Piedmont Triad International Airport.
Dear Mr. Pickle
"Thank you for your e-mail response of March 22, 2012 to my previous letter and your discussion
with Richard Darling on March 28, 2012. Based on this response aid additional review of the
current field sampling locations for the Stormwater Discharge Outfalls (SDOs), the Piednont
Triad Airport Authority and NPDES NCS000508 co-permittees propose some logical
adjustments. Apparently some of the locations and numbering of stormwater management
features presented in the 2010 NPDES permit renewal were based on inlet pipes to
retention/detention ponds and/or sediment traps. The applicable qualitative SDO sampling
locations (Map I) would seem to more appropriately be designated at the outfalls to these
features. The following adjustments to the qualitative sampling -locations are proposed:
• Location 32 has been sampled at the FedEx No 1 Pond inlet pipe; it is proposed to be
relocated to the FedEx No. I Pond outlall as SDO 032 (Map 2).
o Location 34 has been sampled at the second of the two Fed Ex No. 2 Pond inlets; it will
be eliminated because SDO 033 has been sampled at the FedEx No. 2 Pond outfall
(Mai) 3).
• Similarly, locations 35 and 37 will be eliminated because SDO 036 is sampled at the
FedEx No. 3 Pond outfall (Map 4).
• Similarly, location 39 will be eliminated because SDO 038 is sampled at the Honda No. 1
Pond outfall (Map 5).
o 'Locations 63, 64, and 65 will be eliminated because SDO 028 is sampled at the pond
outfall to which these pipes inlet (Mal) 6).
o Locations 66 and 67 will be eliminated because SDO 029 is sampled.at the pond outfall
to which these pipes inlet (Map 7).
1000 A. Ted Johnson Parkway, Greensboro, NC 27409, 336.665-5600

April 18, 2012
Mr. Ken Pickle
Page 2 of 2
The following adjusuncnts are also proposed based on further field investigation:
a SDO 003 is proposed to be relocated downstream as it is incorporated' into the Honda
facility expansion site. When thencw.outfall is completed, anticipated September 2012y
tine sannpling.poiril will be relocated. here (Map 8).
o Erosion and channel stability issues have°recently been identificcl.at SDO 16A. Proposed
repair and stabilization will be added to the list of previously identified repairs (Mal) 9).
a SDO 021: and SDO 022 were rcconfigurcd during construction of the new runway and
this drainage is currently channeled to SDO 020 and SDO 023 respectively. SDO 021
and SDO022 no longer e-xist and are proposed to be eliminated from the sampling
program (Mal) 10, Map 11).
Consistent with the rationale of sampling at final dischargq)oints rather than at locations within
the slornnwater-management system, leading to the adjustments proposed above, the list of SDO
locations proposed to be added. to thc,NPDES monitoring program pendiing.applicable future site
development will be based on the actbal location of the oulfalls, not inlets to retention/detention
ponds or sedinnent imps. The originally proposed twenty-three locations numbered 41 through
61 will actually correspond'to eleven SDOs. These are proposed to be numbered 041 through
051 consecutively. The maps depicting the an unbered SDO locations [Figures 1 and 2 in tine
2011 PTIA Stormwater Pollution Prevention Plan (SPPP) update] will he revised accordingly in
the 2012 SPPP update along with a summary of the adjustments and rationale.
We look forward to working together to ensure continued permit and regulatory compliance at
Piedmont Triad International Airport. Please feel free to contact nnc or Richard Darling at
919-481=57.40 with any questions or comments.
Sincerely,
PIEDMONT TRIADWAIRPORT AUTHORITY
Mic ,ne L. E
Dir ctor of
It BD/.I A R/LJ AIM L I: rb d
Enclosures: 2010 Aerial Photographs of Proposed Adjustments to Qualitative Sampling
Locations (I I pages)
cc: Site Homewood; DWQ-WSRO
Richard darling; BAKER

Mickey, Mike
From: Homewood, Sue
Sent: Tuesday, May 15, 2012 12:14 PM
To: Mickey, Mike
Subject: FW: PTAA sampling points and turbidity questions
Attachments: PTAA_04-18-2012.pdf; SDO—adjust.pdf
Fyi
Sue Homewood
NC DENR Winston-Salem Regional Office
Division of Water Quality
585 Waughtown Street
Winston-Salem, NC 27107
Voice: [phone]
FAX: [phone]
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.
From: Darling, Richard [mailto:[e-mail]]
Sent: Tuesday, May 15, 2012 11:37 AM
To: Pickle, Ken
Cc: Homewood, Sue; Bennett, Bradley; Higgins, Karen; Elmore, Mickie; Kevin Baker; Julie Beadle; Lisa Elmore; Rosser,
Alex; Allen, Larry; Hodges, Kimberly
Subject: RE: PTAA sampling points and turbidity questions
Ken — attached is the letter I was referring to in our telephone conversation yesterday. I apologize that it has taken so
long and appreciate your on -going patience and understanding as we attempt to refine the monitoring program at PTIA
and ensure continued compliance with the NPDES permit.
Richard
PLEASE NOTE: New Address and Direct Phone effective 0311712012
Richard B. Darling I Environmental Manager I Michael Baker Engineering
8000 Regency Pkwy., Suite 600 1 Cary, NC 27518 1 919.463.5488 (office) 1 919,481.5740 (direct)
rdarlino(a)mbakercoro.com I www.mbakercorp.com
From: Pickle, Ken [ma ilto:ken. [e-mail]]
Sent: Thursday, March 22, 2012 11:50 AM
To: Elmore, Mickie
Cc: Darling, Richard; Homewood, Sue; Bennett, Bradley; Higgins, Karen
Subject: PTAA sampling points and turbidity questions
Hi Mickie,

Thanks for your letter of March 15 . We received it on Monday the 1911, and yesterday I discussed it with Sue
Homewood of the Winston-Salem Regional Office, and internally with Bradley Bennett.
We're fine with your plan to relocate sampling points and to fix erosion features. We will work out the revisions to the
nomenclature for the old vs the new sampling points. We realize that this is the lead in to a follow-up conversation on
the most meaningful way to look at the turbidity benchmarks once we have made the progress you propose. Sue
believes that the 404/401 item will not be a snag.
I'll follow up shortly with a formal letter responding to yours of 3/15, but my thoughts above will be the essence of it.
I appreciate the nice work by Baker on the attachments to your letter.
I've left a voice message for you, but this is all I wanted to say now. You don't need to return my call, unless you need to
return my call.
Regards,
Ken
Ken Pickle
Environmental Engineer
NCDENR I DWQ I Stormwater Permitting Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
512 N. Salisbury St, Raleigh, NC 27604
Phone: [phone]
Fax: [phone]
Email: ken. oicklePncdenr.gov
Website: http://i)ortal.ncdenr.org/web/wci/ws/su
** Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be
disclosed to third parties unless the content is exempt by statute or other regulations.**

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Map 5. Sampling Location 39 (Inlet) to be Eliminated due to SDO038 sampled
at Honda Pond 1 Outfall
Piedmont Triad International Airport March 28, 2012
Stormwoter Pollution Prevention Plan Sheet 5 of 11 Revised SDO Monitoring Locations

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sampled at Pond Outfall
Piedmont Triad Internotionol Airport March 28, 2012
Stormwater Pollution Prevention Plan Sheet 7 of 11 Revised SDO Monitoring Locations

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Map 10. SDO021 No Longer Exists (Flow Re -Routed to SDO020) Sampling
Location Eliminated
Piedmont Triad International Airport March 28, 2012
Stormwater Pollution Prevention Plan Sheet 10 of 11 Revised SDO Monitoring Locations

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PIEDMONT TRIAD AIRPORT AUTHORITY
April 18, 2012
North Caroiiiia Deparhiiegt ofEirvironmentana
NaturalResources;bivision of Water Quality;
Stormwater Permitting Unit
1617'1vlaiI Service Center
Raleigh, NC ' 27699-1617
Attention: Mr. Ken Pickle, Stormwatei•'Engiheer
Subject: NPDES'Individrial Permit NCS000508
PiMniont TOadliiterhational Airport.
Dear Mr. Pickle:
Thank you for your e-mail response of March 22;,2012 to my previous leper and:your discussion
with Richard Darling on -March 28i 2012. Based'on thisn•esponse'and additional'review�ofitlie
current .field sampling locations: for`tlic Stormwater Discharge Outfalls.(SDOs);.tlie Pied �iont
Triad Airiiort, Autliorily and NPDES NCsbo6og' co-perinittees propose some logical
adjustiiients. Apparently •some of the • locations:'aiid .n.dinbering,,of stofinwatcr-iiianagenient
features. presented in the 201'0 NP:DES permit renewal were. -based; on .inlet pipesl to.
retention/detention ponds.and%or sediment traps. The -applicable qualitative SDO ,sampling••
locations (Map,I)`woiild seem to more appropriately be. designated at the,:outfalls 4o these
features. Thiel following adjustments t6.the q}ialilative:sainliliug•locatioiis are proposed:
b 'Location 32.has been §amplcd at the FedE.a-to i PondJnIet'pipcJt•'is proposed toibe
i'elocated'to the FedEx No.-1 Pond outfah'.as;SDO 032 (Map.?).,
o Location34 hasbeen.sampled at.the' secoiid:6f.tli6Awo,FedEs.No..2 Pond inlets; -it Will
be eliminated because SDO,033 has. Been- sampled at the FedC •• No, 2. Pond outfall
(Map 3).
o Similarly, locations.35 and 37• will be eliminated because SDO:036 is sampled at the,
EedEz•No. 3Pond outfall(Ma) 4),
u .Similttrlyi location 39 will be eliminated :becau_se.SDO'038;is;sampled ai the,HgndwNo. I
Pond outfall (Map 5).
G Locations,63, 64, and 65 will be eliminated Because SDO.028 is sampled:at the pond
obtfall!to whicli these'pipes inlet(Map 6).
o 'Locations 66.,and' 67•will be eliminated because SDI 0291'9.san pileiVaf the pondoutfall
to which these•pilies inlet'(Map 7).
I000'A,,Ted Johgson'Pai-kway, Greensbol•o; NC 27409, 336-665-5600.

.April 1 &1.2012'
.Mr. Ken` -Pickle
Piige 2 of 2.
The following adjustments are. also proposed basecl on furilici• field investigation:
o SDO 003 is;proposcd .to be relo6atcd .downstream 'as 'it is incorporated into the Hondif
facility espansionsite. 'When the new outfah is completed; anticipate1•September.2012
the sanipling,poi.it will be+reloclated{here (Map:8).
a Erosion inlet cliaiuiel,stability,issues�have'recently bcen Writifi&l ai SDO.116A. Proposed
repit and stabilization will'be added to:the list of prcviously identified. repairs (Mai) 9).
P SD0'021 aiid SDO022 were reconfigured du ing cotishuction.of the•new runway and
this drainage is currently chaticled, to SDO 02.0 and SDO 023 respectively:. SDO 021
.aiid SDO 022 lib lodger. e.iist and are proposed to 'be, eliminated from 'tile sampling_
P ograni (Map'10; Mali ]"1)
Cbnsistent.witli the rationale of,sampling at fihal' discharge,points rather.than at locations within
the stoniiwater,maiiagcment.systein, leadiig tb�tlie adjustments proposed above;dlie'list of SDO
'local ions: proposed to be added;to'thc,NPDES monitoring program pendhig.applicablc:future.site
developiiient will be b6sed,,6 i the actual.locat oii of the outfalls, not inlets to. retention/detention
*ponds or sediurent traps; 'fhe originally propose'<i.twenty-three locations-numbered•41 through
6i•will _actually correspond'to eleven SDOs. These are proposed to be numbered041 through
051 consecutively. The naps. depicting. the numbered SDO locations [Figures] and 2 in the
2011 P 'IA•,Storurwater Polliition Prevention Plan'(SPPP) update] will be revised accordingly iti
tlie:20112 SPPPiipdate along with a stubmary of the tidjiist.m fits and rationale:
We look, forward to working, together to ensure c6itinued,permit and regulatory compliance at
Piedmont Triiid lnteniationalAirport. Please feel free to contact tile. or Richard Darling, at
919'481-5740.witli,any'questions.0r, comments.
Sincerely;
AUTHORITY
L.
D/JAR/LJA/Mi E:rbd
Enclosures: 2010 Aerial Photograplis ofrProposed Adjnslmeitts to,Qualitative Si t i151ing
.Lociitioiis (I'-1 pages)
co c Se Hoiiiewood; DWO-WSRO
Itichard.Darling; BAKER

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Map 5. Sampling Location 39 (Inlet) to be Eliminated due to SDO038 sampled
at Honda Pond 1 Outfall
'Piedmont Triad International Airport March 28, 2012
Stormwater Pollution Prevention Plan Sheet 5 of 11 Revised SDO Monitoring Locations

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sampled at Pond Outfall
Piedmont Triad International Airport March 28, 2012
Stormwoter Pollution Prevention Plan Sheet 7 Of 11 Revised SDO Monitoring Locations

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Map 10. SDO021 No Longer Exists (Flow Re -Routed to SDO020) Sampling
Location Eliminated
Piedmont Triad International Airport March 28, 2012
Stormwater Pollution Prevention Plan Sheet 10 of 11 Revised SDO Monitoring Locations

Mickey, Mike
From:
Homewood, Sue
Sent:
Wednesday, March 21, 2012 10:20 AM
To:
Pickle, Ken
Cc:
Bennett, Bradley; Basinger, Corey; Patterson,
Mickey, Mike
Subject:
RE: Piedmont Triad Airport, NCS000508
Ken,
Robert; Georgoulias, Bethany; Randall, Mike;
I'm responding to each point below so everyone else can see the answers, but I'll be around today if you want to call to
discuss it in more detail. I don't mind taking the lead if that's easiest, they have asked me to get involved because I'm
familiar with the airport and the streams around it and they thought that my knowledge of the site would help them
explain to the stormwater unit what they are trying to address. I believe you suggested this when you spoke with
Richard about their turbidity exceedances.
Sue Homewood
NC DENR Winston-Salem Regional Office
Division of Water Quality
S8S Waughtown Street
Winston-Salem, NC 27107
Voice: [phone]
FAX: [phone]
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.
From: Pickle, Ken
Sent: Tuesday, March 20, 2012 3:58 PM
To: Homewood, Sue
Cc: Bennett, Bradley; Basinger, Corey; Patterson, Robert; Georgoulias, Bethany; Randall, Mike
Subject: Piedmont Triad Airport, NCS000508
Hi Sue,
(Robert, Bethany, Mike: FYI Only, No Action: I've just copied you all since/ presume you have some interest in, or perhaps just exposure to, airport
permits.)
I'm just looking at a letter that came in yesterday from Mickey Elmore at PTAA. I see you are copied, and it looks like
you helped them understand their site with respect to the 401/404 certification and its conditions, and the conditions of
their stormwater permit.
Mickey starts out the letter "requesting further clarification of the Airport's NPDES Individual Permit." But then he goes
on, and:
• 1 think he is reporting that PTAA has historically sampled the wrong location for SDO 006;
1 think he is reporting that PTAA has historically sampled the wrong location for SDO 024;
0 It looks like he is reporting that PTAA has historically sampled the wrong locations for SDO 026 and 027.

For the 3 bullets above, what we found was that for some reason the locations that are being sampled do not make
sense. They seem to think that the locations were specifically determined in the permitting process and they are
sampling per the permitted locations, but regardless of who made the error, us or PTAA, the locations don't make sense
and need to be relocated. I looked at all these and relocating the sampling makes sense. I think they want to confirm
that the stormwater unit agrees, makes changes to their permit as necessary, and may see some changes to the
sampling (2 of these were supposed to be SDOs and are clearly in -stream sites so sampling results are probably going to
be very different and trends hard to show when the locations are moved).
• In the case of the second and third items above, I think he is suggesting that for purposes of clarity of the
historical record, DWQ should rename the designated outfalls in the permit text, in order to keep the erroneous
records separate from the newly -corrected -location records. Does that make sense from your contact with
them? Do you read Mickey's letter the same way?
Yes, we somehow have to show that the sampling locations are different so we don't try to draw comparisons.
• So, it seems to me that while there may eventually be some need for' further clarification" of the nomenclature
in the airport's permit for purposes of clear records it doesn't sound to me like the heart of the matter is proper
record keeping on DWQ's part, or on PTAA's part. I'm sure that you and I together can straighten that out for
them. And you have already begun that work, it seems.
They want everyone to be on the same page. I don't know what that requires as far as revising the permit, or sampling,
or record keeping etc. I suggested that they just bring up the issue and let you suggest a solution for record
keeping/trend purposes.
• Ultimately, is does not look to me like Mickey is requesting anything from DWQ. If he is, I can't tell what it is
specifically.
They are requesting confirmation that these changes are acceptable and clarification on what they should do for record
keeping to ensure everyone is documenting things the same way (rename sites, etc).
He then goes on to talk about PTAA plans to repair the erosion features at four outfalls (SDO 23, 24, 30, and 33) as well
as an undermined concrete channel adjacent to the Marriott Hotel. He suggests that repairs at these five locations will
provide some response to the recurring turbidity benchmark exceedances, but perhaps even then remediating the five
areas will not achieve full compliance with the turbidity benchmark.
They originally called me after talking to you about their concern that they are being required to sample for turbidity
within streams that are naturally VERY turbid during rain events. I came up with a plan of action for them. They
evaluated every single outfall and stream in the outfall areas and identified a few locations where significant
degradation had occurred and is likely adding to a turbidity problem even if it would be very hard to quantify. They are
willing to take action to repair those areas, with approval from the USACE/DWQ for work in streams and conservation
easement areas. They would then like to re-evaluate the turbidity benchmarks and requirements. I believe this is a
proper course of action. I believe they will also be coming back to us with turbidity exceedances that are not related to
their project/site and we will have to address how to handle that. Seems odd to have a benchmark in a permit that
doesn't have a solution or at least not one they can provide. I consider their current course of action to be "step 1" of a
longer process.
Are you available to bring me up to speed with your contact with these folks? Prior to having the benefit of talking
together, my beginning prejudice is that I'm inclined to be fully ok with the approach of let's do first what we can
cheaply, and then see what's left. Actually, this is sort of the way our stormwater permit benchmarks are supposed to
work. (I think we exercised some forbearance in the first 5-yr cycle of the permit based on the awareness that the FedEx
terminal was under construction. However, generally we have hoped that the contact with the RO would kick in earlier
than well into the second 5-yr term of the permit.)
I don't remember whether Richard Darling of Baker called me about this or not. Maybe they followed the wording in
the permit, and called WSRO on the occasion of the fourth turbidity benchmark exceedance? (Once the permit is issued
by SPU, the permit text is set up for WSRO to be the first resource on issues of benchmark compliance.) Whichever,

since Mickey wrote to me I'll be glad respond to him, but I need to have guidance from you on what the WSRO and SPU
together want to accomplish in this first step. If you want to be the lead in responding to Mickey, that's fine with me too
- - but either way, I'd still like to talk this through together for my own continuing education, if you don't mind.
I'm in the office Wednesday afternoon, and Thursday this week. I'm out Friday. I'm in all next week at the moment.
Can we set a convenient time for you to discuss with me?
Thanks,
Ken
Ken Pickle
Environmental Engineer
NCDENR I DWQ I Stormwater Permitting Unit
1617 Mail Service Center, Raleigh, INC 27699-1617
512 N. Salisbury St, Raleigh, NC 27604
Phone: [phone]
Fax: [phone]
Email: ken. oickle0bncdenr.gov
Website: http://i)ortal.ncdenr.org/web/wq/ws/su
** Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be
disclosed to third parties unless the content is exempt by statute or other regulations.**

Mickey, Mike
From:
Boone, Ron
Sent:
Thursday, October 06, 2011 8:53 AM
To:
Pickle, Ken
Cc:
Mickey, Mike
Subject:
RE: Compressor wash question at PTIA
Hey Ken, Mike Mickey has Guilford County now ... PTIA is in Guilford.
Ron Boone
NC DENR Winston-Salem Regional Office
Division of Water Quality, Surface Water Protection
585 Waughtown Street
Winston-Salem, NC 27107
Voice: [phone]
FAX: [phone]
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.
From: Pickle, Ken
Sent: Thursday, October 06, 2011 8:47 AM
To: Boone, Ron
Cc: Basinger, Corey
Subject: FW: Compressor wash question at PTIA
Hi Ron,
I got a bounce back message from Corey's email on this note below. I see you've got Forsyth County, but I'm not sure if
you're the one to be concerned about this conversation with the consultants for Piedmont Triad Airport Authority. If
I've got the wrong person in W-S, would you please forward to them?
This is basically FYI, no action. Unless you want to comment on the approach I've indicated, or on your interest in the
additional sampling data proposed by the consultants. I'm always open to better ideas/responses.
I'(ai
Ken Pickle
Environmental Engineer
NCDENR I DWQ I Stormwater Permitting Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
512 N. Salisbury St, Raleigh, NC 27604
Phone: [phone]
Fax: [phone]
Email: ken. oickleCa)ncdenr.gov
Website: http://i)ortal.ncdenr.org/web/wg/ws/su
** Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be
disclosed to third parties unless the content is exempt by statute or other regulations.**

From: Pickle, Ken
Sent: Thursday, October 06, 2011 8:35 AM
To: 'Allen, Larry'; Bennett, Bradley; Darling, Richard; Basinger, Corey
Cc: Patterson, Robert; Beadle, Julie; Elmore, Lisa; Elmore, Mickie; Baker; [e-mail]; [e-mail];
[e-mail]
Subject: RE: Compressor wash question at PTIA
Mr. Allen:
Thanks for continuing the communications with us. I've copied our Winston-Salem Regional Office on our email
exchange so that they can be aware of your questions, and how PTAA and COMAIR plan to proceed. The Regional Office
will forward any additional comments they may have.
I have two questions.
Just to clarify the physical circumstances: I note your report that the storm drain is —300' away, and that the
compressor cleaning wastewater will have a limited spread around the wash station. Intuitively, the 300' is
pretty far away in terms of travel distance and travel time from the cleaning station. Unless, of course, there is
a ditch, or curb line, or swale, or pipe, or culvert, or other hard surface concentrated drainage conveyance from
the cleaning station area to the storm drain. If such a conveyance exists, then the 300' that we intuitively
thought was pretty faraway, suddenly becomes not so faraway after all. Are there physical features that
function as concentrated drainage conveyances to the storm drain?
How much sludge/debris/solid material would be generated over time from the compressor cleaning activity?
presume part of the compressor wash procedure would include the dry clean-up of the wash station area,
right?
So, as to the current task for Baker: I presume your revision to the SPPP will note in some way, and at some level of
detail, the procedures that COMAIR will use to manage the small amount of wastewater expected from the occasional
compressor cleaning on the apron. This procedure would attract our attention during an inspection, and so I'd suggest
that the SPPP might include not just the an outline of the procedures, but also some form of the wastewater
management rationale that you present in your email below.
And as to the question about whether any permit revisions are needed now: Based on your description and our
understanding of the proposed activity and management measures, we can wait until the permit is renewed to consider
whether any changes to the permit are appropriate.
As to your suggestion of additional sampling at the outfall that is currently excluded from monitoring via representative
outfall status: PTAA and Baker might be interested in that data as a management measure to be sure that there are no
unpleasant surprises from this new activity. I'll let the Winston-Salem Office comment on what their interests may be in
seeing the data from a compliance and enforcement perspective. As far as I'm concerned as to our permitting function
in the Central Office, my interest would be in whether the data could inform our decision at the time of permit renewal
to include or not include new monitoring requirements on the outfall that is currently not being monitored (PTAA would
have an interest in this point, too, obviously.)
I've gone into your note below and added bold font to the ideas in your rationale below that might be relevant to our
Regional Office inspector, and that you might consider including in the revised SPPP. Also, please consider reiterating in
the SPPP procedure your earlier report that the compressor wash activity would not be conducted during rain, at night,
or when rain is anticipated. However you write up the procedure, our focus will remain on the fact that the current
permit does not authorize the discharge of this wastewater.
Thanks again for checking in with us on this proposed new activity.
Ken Pickle
Environmental Engineer

NCDENR I DWQ I Stormwater Permitting Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
512 N. Salisbury St, Raleigh, NC 27604
Phone: [phone]
Fax: [phone]
Email: ken. pickle0ncdenr.gov
Website: http://portal.ncdenr.org/web/wa/ws/su
** Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be
disclosed to third parties unless the content is exempt by statute or other regulations.**
From: Allen, Larry [mailto:[e-mail]]
Sent: Wednesday, October 05, 2011 2:14 PM
To: Pickle, Ken; Darling, Richard
Cc: Patterson, Robert; Bennett, Bradley; Beadle, Julie; Elmore, Lisa; Elmore, Mickie; Baker; [e-mail];
[e-mail]; [e-mail]
Subject: RE: Compressor wash question at PTIA
Mr. Pickle:
Thank you for your response in regards to the use of ZOK 27 on the COMAIR aircraft apron at
Piedmont Triad International Airport. Based on a site review of the proposed wash location and
discussions with COMAIR personnel, the subject compressor washing will occur over 300 feet from
the nearest storm drain. Because the grades of the aircraft apron are so flat at this location, the
wash water will not flow directly to a storm drain, rather it should spread out on the aircraft
apron until evaporation and surface tension stop any further flow. Due to the small quantities
involved, this shallow puddle will extend only a small area in the immediate vicinity of the wash
location. During a site review, shallow stormwater puddles were observed after recent rainfall
which appeared not to flow to the nearest storm drains because of the flat grades in this area.
Further, COMAIR will place absorbent socks around the area to act as a barrier where the task
will be done and removed after the evaporation process is complete. This measure will be utilized
to further ensure that the ZOK 27 and water does not reach the storm drains.
It is therefore my opinion that the proposed wash process would not produce any wastewater
discharge. The nearest monitored Stormwater Discharge Outfall is SDO 019, represented in
quantitative sampling by SDO 016A. We propose to review all future qualitative and quantitative
monitoring results for these SDO's and report any atypical result directly to you.
Please contact myself, or Richard Darling, at your earliest convenience if you have any reservations
about this proposed procedure.
Thank you,

Larry Allen, P.E.
Sr. Project Manager
Michael Baker Engineering, Inc.
7800 Airport Center Drive, Suite 100
Greensboro, NC 27409
336.931.1500
336.931.1501 - Fax
IallenCa.mbakercorp.com
From: Pickle, Ken [[e-mail]]
Sent: Tuesday, October 04, 2011 1:42 PM
To: Darling, Richard
Cc: Patterson, Robert; Bennett, Bradley
Subject: Compressor wash question at PTIA
Mr. Darling,
I've received your report that COMAIR, a tenant of PTAA, will be using ZOK 27 as a compressor wash solution. You
requested DWQ review of the washing process wrt your task of revising the Airport's SPPP. I have the following review
comments.
• PTIA's NPDES stormwater discharge permit does not authorize the discharge of wastewater, only stormwater.
Equipment wash waters of every kind are wastewaters, not stormwaters.
If the waste wash waters flow to a nearby drain, that would constitute an unauthorized wastewater discharge, and
would be subject to enforcement action under federal and state regulations. PTAA is not authorized to discharge this
liquid material under the current permit.
On the other hand, if the small quantity of wastewater (you reported 5 gallons per plane, no more than 2 planes per
day) does not actually move to a drain, but instead is evaporated on the tarmac, there would be no wastewater
discharge. Any subsequent stormwater discharge from a rain event would be regarded as stormwater from the
equipment cleaning area.
At the time of permit renewal we may reconsider this usage of chemicals and may include the outfall as one of the
stormwater outfalls to be monitored, if it is not already monitored. The chemical nature of the solvent may also impact
the required stormwater monitoring parameters.
• Just to reiterate, what I'm saying is that if the plane is parked over a storm drain during the wash process, we can
assume that the flow goes directly into the drain: that would be an unpermitted wastewater discharge, and subject to
enforcement action.

t .P ;--
a Unfortunately, limited management alternatives come to mind for this wastewater, including:
• Provide mats or other barriers for the storm drains at the time of equipment cleaning, and thereby prevent discharge of
this wastewater. Collect the wastewater and dispose of it some way other than in the storm drain.
• Control the timing of wash procedures to insure that the liquid material evaporates in place, and that none of it enters
the stormwater drainage system.
• Provide a UST to accept the waste wash water. Incorporate procedures so that the UST will receive the flow during the
compressor wash process, but that subsequent rainwater flows may be directed to the stormwater system, rather than
into the UST. The procedure would involve perhaps, opening a valve into the UST at the start of the washiprocess, and
closing it when the wash pad area had fully drained into the UST. It would seem reasonable to keep records of the
generation of this wastewater to insure that our inspector could ascertain that the procedure was full followed, and that
the wastewater was not introduced into the stormwater drainage system.
• Other alternatives may be possible, but they don't come to mind at the moment.
Please contact me with any questions or comments.
Ken Pickle
Environmental Engineer
NCDENR I DWQ I Stormwater Permitting Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
512 N. Salisbury St, Raleigh, NC 27604
Phone: [phone]
Fax: [phone]
Email: ken. olcklePncdenr.Qov
Website: htto://i)ortal.ncdenr.org/web/wci/ws/su
** Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be
disclosed to third parties unless the content is exempt by statute or other regulations.**

r�
�s��
NC®ENR
North Carolina Department of Environment and
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
March 15, 201.0
Mr. George W. House
Brooks, Pierce, McLendon, Humphrey & Leonard, LLP
PO Box 26000
Greensboro, North Carolina 27420
Dear Mr. House:
FNAI'R
C. Dem
19 2010
instonEw�'Natural Resources 9'°""°�`"
Dee Freeman
Secretary
Subject: Response to Comments on Draft NPDES
Stormwater Permit
Permit No. NCS000508
Piedmont Triad International Airport
Guilford County
DWQ received written comments from your firm, on behalf of PTAA, on draft NPDES Permit
NCS000508 for the subject facility on March 2, 2010 during the extended public comment period.
We appreciate the time and effort reflected in the comments and suggested changes.
The comments have been summarized and classified below as those either: (1) accepted and to be
incorporated into the final permit or (2) fully or partially rejected along with the rationale/ basis for
doing so and those requiring further discussion.
Accepted Comments
Comments A-J, O, R, T, and W-BB are accepted and will be incorporated in to the final permit as is
or with slight wording variances in accordance with our understanding of your intent.
Other Comments
Comment K: Analytical monitoring parameters for BOD and COD are two of our most common
stormwater pollution indicators, and historical BOD results from the facility have shown levels
of concern both at outfall and in -stream locations. Furthermore, airport deicing compounds are
well known for their ability to exert significant oxygen demand on receiving waters and
rfe'-itively impact stream biota. Benchmark concentrations have been incorporated into our
stormwater program consistently since 2007 in most of our general and individual NPDES
permits requiring analytical monitoring. Benchmark concentrations are utilized as triggers to
Wetlands and Stormwater Branch One
Mail Service Center, Raleigh, North Carolina 27699-1617 North Carolina
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone] Customer Service: 1-877-623-6748 �%�lllterrllll f
Internet: vv w.ncwaterquality.org
An Equal Opportunity 1 Affirmative Action Employer

Mr. George W. House
Brooks, Pierce, McLendon, Humphrey & Leonard, LLP
`-Permit No. NCS000508
alert the permittee to potential problems and to help facilitate prevention of water quality
` standard violations. BOD and COD benchmarks will remain in the final permit.
2. Comment L: The proposed change will be incorporated into the final permit with the exception
that your proposed revision of, "surface water quality standards" will be replaced with
"benchmark concentrations".
3. Comment M: The intent of this portion of the permit is to solicit the permittee to address
multiple benchmark Qxceedan&s whether; they occur four, tiines'in arrow or intermittently over
the duration of the permit; In either ease, efforts'on part of the permitee' must be made to
identify and correct the cause and if not resolved, notify the DWQ Regional Office. This
requirement is consistent with other permits issued since 2007 within our program and will
remain in the final permit. Please note that.D1NQ always has the option when presented with
compelling circumstances or data to reduce, modify or eliminate monitoring for any parameter
when compliance with benchmark concentrations is not feasible or difficult due to offsite
sources, unique events, or other significant factors.
4. Comment N: The permittee's discharge must not violate surface water quality standards
regardless of permit conditions. Benchmark concentrations are used in our stormwater
program as a tool to prevent water quality standard violations. Stormwater control measures
such as structural stormwater controls are one option, among others, available to DWQ after
four benchmark exceedances. Since the adoption of the tiered response system in 2007, DWQ
has rarely required structural stormwater controls as a result of benchmark violations, and it is
our experience that other less -costly options are normally explored prior to installation of
structural control measures. The final permit language will remain unchanged.
5. Comment P: The proposed change or similar language will be incorporated into the final
permit. The permittee is not responsible for benchmark exceedances that occur as a result of
other facilities' operations or discharge. In this type of circumstance, DWQ will engage with the
permittee to relieve them of additional monitoring associated with events beyond their control.
It is anticipated that this type of exceedance would be a rare probability at the subject facility.
6. Comment Q: This sentence will be revised in the final permit to read, "If additional BMPs are
needed to achieve the required level of control as mandated by a TMDL, if any, the permittee
will be required to...". Note that this facility is not named in the TMDL for East Fork Deep
River as a point source, and it is not expected that additional BMPs will be required as a result.
7. Comment S: The proposed change or similar language will be incorporated in the final permit.
Two consecutive benchmark exceedances at outfall locations during deicing event monitoring
will require the permittee to increase monitoring frequency to once per month for the remainder
of the deicing season so long as a qualified deicing event occurs during each month.
8. Comment U: The proposed change or similar language will be incorporated in the final permit.
Two consecutive benchmark exceedances at in -stream locations during deicing event
monitoring will require the perrdttee to increase' monitoring frequency to once per month for

•- �y'fr. George W. House
Brooks, Pierce, McLendon, Humphrey & Leonard, LLP
Permit No. NCS000508
the remainder of the deicing season so long as a qualified deicing event occurs during each
month.
9. Comment V: See Comment K response BOD and COD benchmarks will remain in the final
-. )ernut.
10. General Cominent (Cover Letter Pg. 2): Your comment on the lack of a tiered response regime in
the General Permit for airport operations, NCG150000, or other individual permits for similar or
larger airports including RDU and CLT is noted and understood. Please be aware that
NCG150000 was written primarily to cover small commercial or general aviation airports that
do not conduct routine deicing activities and does not require analytical monitoring; thus a
tiered response approach is not applicable to NCG150000. With regard to the individual
permits for large airport operations, analytical monitoring with benchmark concentrations and
tiers will be put in place if not already when that particular facility's permit comes up for
renewal. Please note that Global Transpark does not currently have permit coverage but it is
anticipated that a more broad -based MS4 permit containing not only industrial requirements
but also additional Phase Il requirements will he issued to this facility in time.
Your comments requested a meeting before issuance of the final pernut. We would be happy to
discuss your connnents and our responses in the near future. Please contact myself [(919)-807-6365
or cory.larsenQncdenr.gov] or Ken Pickle [(919)-807-6365 or [e-mail]] once you have
received this response to schedule a meeting if so desired.
Again, we appreciate your input on this draft permit.
Sincerely,
CorOiiseii
Environmental Engineer
Stormwater Permitting Unit
cc: Winston-Salem Regional Office, Corey Basinger
Central Piles
Stermwater Permitting Unit

PTAA
PIEDMONTTRIAD
AIRPORT AUTHORITY
March 15, 2012
North Carolina Department of Environment and
Natural Resources; Division of Water Quality;
Stormwater Permitting Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Attention: Mr. Ken Pickle, Stormwater Engineer
Subject: NPDES Individual Permit NCS000508
Piedmont Triad International Airport
Dear Mr. Pickle:
N.C.Dept. ofFNR
MAR 19 2012
Pursuant to field review on January 13, 2012 with Sue Homewood (WSRO) and Richard Darling
[Michael Baker Engineering, Inc. (BAKER)] and on behalf of the Piedmont Triad Airport
Authority (PTAA) and NCS000508 Co-Permittees, I am requesting further clarification of the
Airport's NPDES Individual Permit.
The Stormwater Discharge Outfall (SDO) locations listed in Part II Section B Table 1 of the
permit have been subject to the routine and episodic analytical and qualitative monitoring
programs specified since before the initial permit was issued in 2005. The following locations
appear to require some additional interpretation and/or be more appropriately referenced:
• SDO 006 has been historically sampled several hundred feet below the SDO, where
roadside drainage mixes with the Airport discharge. This location has been corrected to
sample at the SDO beginning February 17, 2012.
• SDO 024 has historically been sampled at the two 24" RCPs draining only the adjacent
landscaped area via a trapezoidal concrete channel. The "SDO 024" referenced in the
original representative sample grouping rationale (enclosed) appears to be the single 36"
RCP several feet below the currently sampled location. The sampled location may be
better renamed (SDO 024A) or relocated to the original SDO 024.
• SDO 026 and SDO 027 are both sampled in unnamed tributary (UT) streams to Brush
Creek, several hundred feet down from the respective SDOs. These locations may better
be characterized as "in -stream" locations or relocated to the SDO.
Based on BAKER's follow-up field investigation of erosion issues at the Airport, PTAA is
instigating repair and stabilization work at the 'following locations as identified in the attached
BAKER "Technical Memorandum:
• Replace failed pipe at SDO 023
• Stabilize head -cut near SDO 024
Post Office Box 35445 •Greensboro, NC 2�7425 •Fax [phone]
Greensboro 336-665-5600 •High Point 336-454-3213 •Winston-Salem 336-721-0088

March 15, 2012
Mr. Ken Pickle
Page 2 of 2
• Repair concrete channel near Marriot Hotel
• Repair and stabilize channel eroded at SDO 030
• Repair and stabilize channel eroded at SDO 033
It is anticipated that while these repairs may not eliminate turbidity benchmark exceedances for
the in -stream monitoring locations, they will at least reduce turbid discharges. As soon as plans
are developed for these locations, they will be forwarded to Sue Homewood (WSRO) and the
United States Army Corps of Engineers requesting verification that they are consistent with
issued Section 401 and 404 individual permit conditions. 'rhe proposed repairs are summarized
in BAKER's Scope of Work, enclosed.
We look forward to working together to ensure continued permit and regulatory compliance at
Piedmont Triad International Airport. Please feel free to contact me or Richard Darling at 919-
459-9009 with any questions or comments.
Sincerely,
AIRPORT AUTHORITY
RBD/JAR/LJA/K.IB/MLE: rbd
Enclosures: PTIA Representative Outfalls Rationale, 10/27/2004
BAKER Tech. Memo. From J. Byers to R. Darling & A. Rosser, 01/23/2012
BAKER Scope of Work for Erosion Control and Stabilization, 02/16/2012
cc: Sue Homewood; DWQ-WSRO
Richard Darling; BAKER

Technical Memorandum
DATE: January 23, 2012
TO: Richard Darling, Alex Rosser
FROM: Jake Byers
SUBJECT: NPDES Permit NCS000508 Stormwater Management Inspection
In compliance with the subject National Pollutant Discharge Elimination System (NPDES) individual
permit issued by the North Carolina Department of Environment and Natural Resources (NCDENR) to
the Piedmont Triad Airport Authority (PTAA), a stormwater management inspection was conducted at
Stormwater Discharge Outfall (SDO) locations due to sampling results detected above benchmark
values.
As reported in the January 16, 2012 Technical Memorandum, a survey of all SDOs was recommended by
NCDENR (Sue Homewood) in order to identify erosion issues. On January 19, 2012, BAKER (Jake Byers
and Richard Darling) completed a preliminary field review of suspect SDOs suspected of contributing to
turbidity benchmark exceedances, as follows:
SDO 023
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Page 1 of 5

Technical Memorandum
NPDES Permit NCS000508
Issue:
Major erosion and mass wasting of a steep hill slope upstream from SDO 023 has introduced a large
amount of sediment into the watershed. A pipe (" 24" RCP) has failed due to the erosion. The pipe was
connected to an existing pre -cast manhole to drop the stormwater to the grade of the outlet channel
(SDO 023). Due to the hill slope failure, this pipe has failed. A small sediment basin has been
constructed which allows water to enterthe man hole via the hole where the pipe used to connect. This
allows large amounts of sediment to enter the watershed.
Potential Solution:
Install new pipe (-30' of 24" RCP) with the appropriate foundation and bedding material and connect to
existing man hole. Re -build hill slope with appropriate soil material in 8"-10" lifts and compact
according to NCDOT standards. This will require geotechnical analysis and design.
• Hill slope stabilization options (or different combinations of below):
o Temporary and permanent seed, straw, erosion control matting and live stakes
o Hydroseeding and live stakes
o Bio-Engineering techniques such as live fascines, or brush layers
o Seed, straw, coir logs/waddles
o Rip -Rap
Page 2 of 5 January 23, 2012

Technical Memorandum NPDES Permit NCS000508
Issue:
A head cut is migrating up valley causing erosion.
Potential Solution:
Add additional rip -rap to existing gully. This would require minimal earthwork and re -vegetation.
Formal plan production, survey layout, Erosion Control, and Live Staking may not be needed in this area
so cost could potentially be lower.
Collapsed Concrete Channel near Marriot Hotel
Issue:
Concrete lined trapezoidal channel has been undermined and has collapsed in some sections. This has
caused erosion, enabling turbid flow directly into Brush Creek.
Potential Solutions:
Option 1
Conduct field investigations to determine the extent of undermining. If undermining is localized and
foundation is stable everywhere else, the areas of the channel that have fallen in can be re -built.
Page 3 of 5 January 23, 2012

Technical Memorandum
NPDES Permit NCS000508
Option 2
If it is found the foundation is failing in multiple areas, all concrete sections should be removed and
salvaged if possible and the foundation corrected/stabilized and the concrete channel re -built.
Option 3
Excavate and dispose of existing concrete sections. Reshape channel and line with filter fabric and
Rip -Rap.
SDO 030
Issue:
Stormwater outfall has cut a severely eroded channel on a hill slope. The channel at the closest end to
the outfall has vertical banks—20'-30' tall with a 10' tall head -cut —50' from the pipe outlet. Erosion
from this area is severe and adds a very large amount of sediment to the watershed. This area was
noted by DWQ as a significant issue.
Potential Solutions:
The outlet channel will need to be stabilized and brought back up to a level closer to the outlet invert
elevation and a channel sized appropriately should be constructed and stabilized accordingly for the
proposed slope. Then the channel will need to be stepped down using boulder step -pool structures
down to a point in the channel where it is stable. The step -pool system will dissipate energy from the
stormwater and act as grade control to prevent head -cuts. The channel banks will need to be laid back
to a slope of at least 2:1 or flatter. The new slope sides will need to be seeded, mulched, and matted
Page 4 of 5 January 23, 2012

Technical Memorandum
NPDES Permit NCS000508
with erosion control matting. Woody vegetation will also need to be re -planted. The amount of
earthwork and the location where the new stabilized channel stops could be adjusted to lower costs
along stabilization/planting options.
SDO 033
Issue:
Stormwater outfall appears 2-4' too high (perched) with no/minimal stabilization. The banks of the
channel that has formed from the stormwater discharge are eroding and the channel is head -cutting.
Potential Solution:
The outfall will need to be stabilized with a boulder step pool system down to the stable channel
elevation. The channel will need to be re -shaped with the correct geometry and the banks matted and
re -vegetated.
11101064.5np, a 1104QSL{0338 NPOESIC.m,Ii n,6PW SDO,JEi..OW,,u,,Wtlou
Page 5 of 5 January 23, 2012

PTIA Representative Outfalls Rationale
A total of 32 Outfalls were found at the Piedmont Triad Airport. These Outtalls were grouped in terms of activities
conducted, significant materials stored that potentially may be exposed to stormwater runoff, stonnwater management
systems, and (low. One Outfall from each grouping was selected as a representative Outfall of the group. The
representative Outfall was selected based on a review of historical sampling data in which the representative Outfall
chosen showed the highest detected concentrations of parameters within the grouping. Below are the descriptions of each
representative Outfall for each grouping
1. Group 1- Outfalls 016a, 024, 025, and 026. Representative Outfall 024. Activities - Airport Maintenance and Operations.
Outfall 024 is located northwest of the airport terminal and is associated with storage and maintenance areas, in which diesel is
stored in USTs. Additionally, some de-icing activities are also performed in this drainage area. Outfall 24 discharges to an
unnamed tributary to Brush Creek, a Class WS III, NSW water in the Cape Fear River Basin. This Outfall consists of a 56 acre
drainage area, including 9 acres of impervious area and 47 acres of unpaved area Based on historical sampling data, Outfall 024
was chosen as representative of Group 1 Outfalls.
2. Group 2 - Outfalls 001, 002, 003, 004, 005, 008, 013, 017, 018, 019, 020. Representative Outfall 004. Activities - Airfield
and Associated Vegetated Areas. Outfall 004 is located on the southeastern side of the airport property and discharges to an
unnamed tributary to Horsepen Creek, a Class WS Ill, NSW water in the Cape Fear River Basin. Stormwater associated with
Outfall 004 consists of airfield runoff, including glycol used for de-icing. Grass swales manage stormwater runoff in this area to
the collection point where it drains into a reinforced concrete pipe where it is again discharged into grass swales. This Outfall
consists of a 156 acre drainage area, including 27 acres of impervious area -,aid 129 acres of unpaved area. Based on historical
sampling data, Outfall 004 was chosen as representative of Group 2 Outfalls.
Group 3-Outfalls 006, 007, 014, 015, 016, 021, 022, and 023. Representative Outfall — 022. Activities - Aircraft Refueling,
Storage, Transfer and Maintenance Areas. Outfall 022 is located on the northwest side of the airport property and discharges
to Brush Creek, a Class WS 111, NSW water in the Cape Fear River Basin. Stormwater management systems employed in the
drainage area for Outfall 022 consists of oil/water separators and secondary containment dikes. Jet A fuel, AV Gas, gasoline, and
new/used oil are stored, transferred and used for aircraft refueling in this drainage area, Jet A fuel and AVGAS are stored in both
underground and above ground storage tanks, as well as in mobile refueling tankers. Aircraft are also washed in hangers and
glycol is used for deicing within the drainage area for Outfall 022. This Outflit consists of a 17.7 acre drainage area, including
8.3 acres of impervious area and 9.4 acres of unpaved area. [lased on historical sampling data, Outfall 022 was chosen as
representative of Group 3 Outfalls.
4. Group 4 - Outfalls 027, 028. Representative Outfall —028. Activities - Storage Areas for Deicing. Outfall 028 is located on
the northwest side of the airport property and discharges to Brush Creek, aClass WS 111, NSW water in the Cape Fear River
Basin. Two USTs and two ASTs of poly-glycol/propylene glycol are stored along southwest end of Cargo Area #2 in the Outfall
028 drainage area. Outfall 028 also contains storm water discharges associated with significant material stored by car rental
agencies, including gasoline, and new and used oil. In addition, Federal Express also stores relatively small quantities of
automatic transmission fluid and new and used oil in divided above ground storage tank, while gasoline and used oil are stored by
airlines a Cargo Area 92. Fill port catch basins and a secondary containment pallet are located in the Outfall 028 drainage area.
Additionally, stormwater rtmoff in this area is managed by flow through grass swales to the collection points where it drains into
a reinforced concrete pipe. This Outfall consists of a 29 acre drainage area, including 4 acres of impervious area and 25 acres of
unpaved area. Based on historical sampling data, Outfall 028 was chosen as representative of Group 4 Otttfalls.
5. Group 5 - Outfalls 029, 030, and 031. Representative Outfall — 030. Activities - Rental Car Facilities. Fill port catch basins
are located in this drainage area with stormwater in this area is managed by flow through grass swales to the collection points
where it drains into a reinforced concrete pipe. Outfall 030 is located on the northwest side of the airport property and discharges
to Brush Creek, a Class WS 111, NSW water in the Cape Fear River Basin. Stormwater discharges from the Outfall 030 drainage
area contains runoff from vehicle maintenance activities, refueling, and storage of gasoline and new and used oil. '['his Outfalt
consists of a 42 acre drainage area, including 19 acres of impervious area and 23 acres of unpaved area. Based on historical
sampling data, Outfall 030 was chosen as representative of Group 5 Outfalls.
6. Group 6 - Outfalls 009, 010, 011, and 012. Representative Outfall — No Outfall. Activities - No activity. No Representative
Outfall was chosen for Group 6, because no activity is associated with the drainage areas of these Cattails.

Exhibit A (Revised 311212012)
Scope of Work
This scope of work defines and describes the services to be provided by Michael Baker Engineering, Inc.
(BAKER) for the Piedmont Triad Airport Authority (PTAA) in support of the erosion control and
stabilization measures requested by the North Carolina Department of Environment and Natural
Resources (NCDENR) Division of Water Quality (DWQ). This scope is proposed to stabilize and correct
five eroding stormwater discharge outfalls (SDOs) located at the Piedmont Triad International Airport
(PTIA) in Guilford County, North Carolina. This scope of work is based on our understanding of your
specific needs for these services along with our experience with similar projects. The scope of the
services presented herein is limited to the following tasks:
TASK 1: EXISTING CONDITION SURVEYS AND ANALYSES
BAKER will conduct detailed surveys of existing conditions at all identified sites (excluding SDO 024).
The existing condition surveys will include:
• Installation of temporary benchmarks/survey control points on -site to be used for existing
condition surveys
• Detailed topographic surveys
• Representative cross -sections at all ditch stormwater outfalls
• Longitudinal profiles of all ditch stormwater outfalls
• Location of all pipes, and above ground utilities in the project area
Other field investigations that BAKER will perform include:
• Geotechnical investigation and analysis of SDO 023
• Stability investigation and assessment of concrete lined channel near the Marriot Hotel
BAKER will utilize the results of the existing conditions surveys, along with Geographic Information
Systems (GIS) technology, to develop base mapping and a Digital Terrain Model (DTM) for the project
area, along with the existing condition plans, profiles, and cross -sections.
TASK 2: DESIGN PHASE SERVICES
BAKER will use the results of the existing condition analyses along with the supplementary field
investigations to develop proposed erosion control and stabilization measures for each of the project
sites (excluding SDO 024). This design will incorporate the most beneficial and cost effective treatments
practicable and will be designed to the NCDENR 2009 Erosion and Sedimentation Control design
standards.
BAKER will conduct hydrologic and hydraulic design in accordance with the criteria provided in the most
current edition of the North Carolina Division of Highways "Guidelines for Drainage Studies and
Hydraulics Design" and the addendum "Handbook of Design for Highway Drainage Studies-1973".
BAKER will prepare design plans based on the design standards described above. The design plans will
be developed with DTM/Computer-Aided Design (CAD) files in MicroStation V8i format on base maps
created from the existing -conditions survey data as described above. The design plan view drawings will
show the existing and proposed grading plans; erosion control measures; vegetation planting plan;
proposed construction access points and entrances, haul roads and staging areas; and other relevant
features. BAKER will develop the proposed design such that the project can be built to within a 0.2-foot
vertical tolerance. The draft design plan set will include:
• Title sheet with a vicinity map
• Legend sheet
• General notes sheet
• Plan view sheets
Page A-1

Exhibit A (Revised 311212012)
Scope of Work
• Longitudinal profile sheets (if necessary)
• Detail sheets
• Typical proposed cross -sections (if necessary)
• Construction sequence
In conjunction with development of the design plans, BAKER will provide preliminary quantity estimates
to PTAAto aid in the development of a detailed construction cost estimate for establishing construction
funding. These quantities will be updated at 60%, and 100% design plan stages.
In addition to the design plans, Technical Specifications will be developed and applicable permits will be
acquired.
BAKER will submit up to three half-size and three full-size hard copies and an electronic copy of the
design plans to PTIA for review. Production of the design plans will complete the scope of work for this
task.
TASK 3: ENVIRONMENTAL AGENCY COORDINATION
Due to the proximity of the proposed work to the Conservation Easements recorded pursuant to the
Section 401 and 404 individual permits issued to PTAA for the Fed Ex and other projects, BAKER will
coordinate with the United States Army Corps of Engineers (USACE) and DWQto confirm that
construction plans do not violate existing permit conditions and will seek approval from these agencies
to proceed.
TASK 4: BID PACKAGE DEVELOPMENT
BAKER will develop a bid package that includes:
• Bidding Requirements
• Bid Forms
• Contract Forms
• General Provisions
• Technical Specifications
TASK 5: CONSTRUCTION OVERSIGHT
BAKER will provide a total of 120 hours of construction oversight services for this project.
SCHEDULE
Design Phase Services
BAKER will submit final plans, technical specifications, and permits to PTAA within 120 calendar days of
our receipt of notice to proceed from PTAA.
Bid Package Development
BAKER will submit the final bid package to PTAA within 120 calendar days of our receipt of notice to
proceed from PTAA.
Construction Oversight
BAKER anticipates 60 calendar days of on -site construction. Construction can begin as soon as all
designs and permits have been approved, the construction contract has been awarded and the
contractor has been provided notice to proceed. Construction oversight will be completed
approximately 180 days from the issue of BAKER's notice to proceed.
Page A-2

Exhibit A (Revised 311212012)
Scope of Work
ASSUMPTIONS
The fallowing assumptions have been used in the development of this scope:
• All sites will be bid in one bid package
• One design plan set will include all sites
• No formal plans or surveys will be required for SDO 024
• NCDENR Erosion and Sedimentation Control Permits will only be required for SOO 030 and
SDO 023
• PTAA will pay for all required permitting fees
• One set of Technical Specifications will cover all sites
Page A-3

I s+tii-�� tsli� �tY
Permit Coverage }�
®fin Renewal Application Form NPDES Permit Number
NCDENR National Pollutant Discharge Elimination System NCS000508
Stormwater Individual Permit
Please provide your permit number in box in the upper right hand corner, complete the information in the space provided
below.and return the completed renewal form along with the required supplemental information to the address indicated.
Owner Information
Owner/ Organization Name:
Owner Contact:
Mailing Address:
Phone Number:
Fax Number:
E-mail address:
Facility Information
Facility Name:
Facility Physical Address
Facility Contact:
Mailing Address:
Phone Number:
Fax Number:
E-mail address:
Permit Information
Permit Contact:
Mailing Address
Phone Number:
Fax Number:
E-mail address:
Discharae Information
Receiving Stream:
Stream Class:
Basin:
Sub -Basin:
Number of Outfalls
* Address to which permit correspondence will be mailed
Facility/Activity Changes Please describe below any changes to your facility or activities since issuance of your permit. Attached a
separate sheet if necessary.
Completion of Honda, FedEx, and the new Runway 5L/23R resulted in reconfiguration of certain stormwater
discharge outfalls (SDOsl as summarized in the significant changes narrative (Suoolement 5, attached). There are
no significant changes in industrial activities, addition or deletion of work processes, changes in material handling
practices, changes in material storage practices, or changes in raw materials used.
CERTIFICATION
I certify that I am
such information I
Signature
it with the Information contained in the application and that to the best of my knowledge and belief
complete and accurate.
Date
Kevin J. Baker, P.E. Executive Director
Print or type name of person signing above Title
SW Individual Permit Coverage Renewal
Please return this completed application form Stormwater Permitting Program
and requested supplemental information to: 1612 Mail Service Center
Raleigh, North Carolina 27699-1612

SUPPLEMENTAL INFORMATION REQUIRED FOR RENEWAL OF INDIVIDUAL
NPDES STORMWATER PERMIT
Two copies of each of the following shall accompany this submittal in order for the application
to be considered complete:
(Do not submit the site Stormwater Pollution Prevention Plan)
Initials
A1. A current Site Map from the Stormwater Pollution Prevention Plan. The location of
industrial activities (including storage of materials, disposal areas, process areas and
loading and unloading areas), drainage structures, drainage areas for each outfall,
� building locations and impervious surfaces should be clearly noted.
I I Q 2. A summary of Analytical Monitoring results during the term of the existing permit
(if your permit required analytical sampling). Do not submit individual lab reports.
The summary can consist of a table including such items as outfall number,
parameters sampled, lab results, date sampled, and storm event data.
I11� 3. A summary of the Visual Monitoring results. Do not submit individual monitoring
reports. The summary can consist of a table including such items as outfall number,
nI o parameters surveyed, observations, and date monitoring conducted.
—� �1�1.. 4. A summary of the Best Management Practices utilized at the permitted facility.
Summary should consist of a short narrative description of each BMP's in place at
the facility. If the implementation of any BMP's is planned, please include
information on these BMP's.
5. A short narrative describing any significant changes in industrial activities at the
permitted facility. Significant changes could include the addition or deletion of
work processes, changes in material handling practices, changes in material storage
practices, and/or changes in the raw materials used by the facility.
6. Certification of the development and implementation of a Stormwater Pollution
Prevention Plan for the permitted facility (Sign and return attached form).
If the final year analytical monitoring of the existing permit term has not been completed
prior to filing the renewal submittal, then the last years monitoring results should be submitted
within 30 days of receipt of the laboratory reports. (i.e. do not withhold renewal submittal
waiting on lab results)

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
2.0 Visual Data Summary 2010-2015 3.0 Analytical Data Summary 2010-2015
Date Location
Color Odor Clarity FS SS Foam Sheen Eros.Dep. Other
pH Turb. D.O. BOD TSS NH3-N COD WAS NOj+NOi N Total P O&G AT EG PG
9/27/2010
SDO 004
None
No
2
1
1
Yes
No
No
Yes
7.03
21.56
2.451
17.5
<0.101
401
0.147
0.272
0.123
<5.0
9/27/2010
SDO 005
Orange
No
5
2
5
No
No
No
No
9/27/2010
SDO 006
None
No
1
1
1
No
No
No
No
6.74
11.22
4.8
9.5
<0.101
461
0.112
0.232
0.177
<5.0
9/27/2010
SDO 007
None
No
1
1
1
No
No
No
No
9/27/2010
SDO 008
None
No
1
1
1
No
No
No
No
9/27/2010
SDO 009
None
No
1
1
1
No
No
No
No
9/27/2010
SDO 014
None
No
2
1
2
No
No
No
No
9/27/2010
SDO 015
None
No
1
1
1
No
No
No
No
9/27/2010
SDO16A
None
No
1
1
1
No
No
No
No
6.92
9.48
3.7
5
<0.10
49
0.138
0.558
0.324
<5.0
9/27/2010
SDO 019
None
No
1
1
1
No
No
No
No
9/27/2010
SDO 024
None
No
1
1.
1
No
No
No
No
6.21
1.88
2.75
<1.0
<0.10
41
0.116
<0.050
0.272
<5.0
9/27/2010
SDO 025
Brown
No
2
1
2
No
No
No
No
9/27/2010
SDO 026
None
No
1
1
1
No
No
No
No
6.34
7.57
2.05
6
<0.10
22
<0.1
0.309
0.106
<5.0
9/27/2010
SDO 027
No
1
1
1
No
No
No
No
6.17
4.63
<2
2.17
<0.10
23
0.109
0.167
0.107
<5.0
9/27/2010
SDO 028
No
1
1
1
No
No
No
No
9/27/2010
SDO030
No
1
1
1
No
No
No
No
6.41
13.82
3.7
4
<0.10
43
0.137
0.11
0.21
<5.0
9/27/2010
SDO 032
No
1
1
1
No
No
Yes
No
1
9/27/2010
SDO 033
No
1
1
1
No
No
No
No
6.08
2.52
2.05
1
<0.10
21
<0.1
0.106
0.122
<5.0
9/27/2010
SDO 036
No
1
1
1
No
No
No
No
9/27/2010
SDO 038
No
1
1
1
No
No
No
No
12/1/20101
IS #01
6.86
8.43
13.89
>100%
12/1/2010
IS #02
6.38
72.86
12.12
>100%
12/1/2010
IS #05
6.79
42.35
12.88
>100%
12/1/2010
IS #06
6.59
62.03
12.17
>100%
12/1/2010
IS #07
7.37
19.89
17.35
>100%
12/1/2010
IS #08
6.70
12.11
14.39
>100%
12/1/2010
IS #10
7.12
75.36
12.95
>100%
12/1/2010
IS #11
6.91
27.54
11.54
>100%
12/1/2010
SDO 004
Brown
No
2
1
2
Yes
No
No
No
6.62
10.98
2.59
3
<0.10
37
<0.1
0.578
0.062
<5.0
>100%
<10.0
<10.0
12/1/2010
SDO 005
None
No
1
1
1
No
No
No
No
12/1/2010
SDO 006
None
No
1
1
1
No
No
No
No
6.10
2.48
2.141
1.66
<0.10
17
<0.1
0.137
0.078
<5.0
>100%
<10.0
<10.0
12/1/2010
SDO 007
None
No
1
1
1
No
No
No
No
12/1/2010
SDO 008
None
No
1
1
1
No
No
No
No
12/1/2010
SDO 009
None
No
1
1
1
No
No
No
No
12/1/2010
SDO 014
None
No
1
1
1
No
No
No
No
12/1/2010
SDO16A
None
No
1
1'
1
No
No
No
No
6.14
24.51
<2
4
<0.10
32
0.112
0.356
<0.050
<5.0
>100%
<10.0
<10.0
12/1/2010
SDO 017
None
No
1
1
1
No
No
No
No
12/1/20101
SDO 018
None_
No
1
1
1
No
No
No
No
12/1/20101
SDO 019
None
No
1
1
1
No
No
No
No
12/1/20101
SDO 023
None
No
1
1
1
No
No
No
No
12/1/2010
SDO 024
None
No
1
1
1
No
No
No
No
6.16
2.53
<21
7.75
<0.10
13
<0.1
<0.050
<0.050
<5.0
>100%
<10.0
<10.0
12/1/2010
SDO 025
None
No
1
1
1
No
No
No
No
12/1/2010
SDO 026
None
No
1
1.
1
No
No
No
No
6.37
7.261
2.541
22.5
<0.10
15
<0.1
0.409
<0.050
<5.0
>100%
<10.0
<10.0
12/1/2010
SDO 027
None
No
1
1
1
No
No
No
No
6.33
5.95
4.48
1.5
<0.10
12
<0.1
0.277
<0.0501
<5.01
>100%
<10.0
<10.0
Piedmont Triad International Airport NCS000508
NPDES Permit Renewal Application Sheet 1 of 13 1211012014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Visual and Analytical Data Summary (continued)
Date Location
Color Odor Clarity FS SS Foam Sheen Eros.De . Other
pH Turb. D.O. BOD TSS NH;-N COD WAS NO3+NOi N Total P O&G AT EG PG
12/1/2010
SDO 029
Brown
No
3
1
1
No
No
No
No
12/1/2010
SDO 030
None
No
1
1
1
No
No
No
No
7.00
6.45
<2
30
<0.10
5
<0.1
0.787
<0.050
<5.0
>100%
<10.0
<10.0
12/1/2010
SDO 031
None
No
1
1
1
No
No
No
No
12/1/2010
SDO 033
None
No
1
1
1
No
No
Yes
No
7.64
7.71
2.54
1.33
<0.10
17
<0.1
0.171
0.071
<5.0
>100%
<10.0
<10.0
12/1/2010
SDO 036
None
No
1
1
1
No
No
No
No
12/1/2010
SDO 038
None
No
1
1
1
No
No
No
No
12/1/20101
SDO 062
None
No
1
1
1
No
No
No
No
1/12/2011
IS #01
6.44
27.49
8.92
>100%
1/12/2011
IS #02
6.37
34.18
10.34
>100%
1/12/2011
IS #05
6.59
41.82
7.62
>100%
1/12/2011
IS #06
7.14
37.02
9.37
>100%
1/12/2011
IS #07
6.63
26.18
10.40
>100%
1/12/2011
IS #08
6.451
9.62
9.911
>100%
1/12/2011
IS #10
6.97
59.28
10.76
>100%
1/12/2011
IS #11
6.30
13.19
11.22
>100%
1/12/2011
SDO 004
6.82
18.49
286
1.97
434
>100%
<10.0
219
1/12/2011
SDO 006
6.49
24.78
<2
0.338
14
>100%
<10.0
<10.0
1/12/2011
SDO 024
6.38
36.20
1,340
10.1
2,370
>100%
12.5
1,870
1/12/2011
SDO 026
7.02
8.41
114
30.4
397
>100%
<10.0
<10.0
1/12/20111
SDO 027
6.11
11.36
2,900
1.47
4,680
>100%
<10.0
2,810
1/12/20111
SDO 030
7.31
12.04
3.24
4.8
37
>100%
<10.0
<10.0
1/12/20111
SDO 033
6.87
32.871
1 140
<0.10
2551
1 >100%
<10.01
33.2
1/26/2011
IS #01
7.17
11.05
13.12
>100%
1/26/2011
IS #02
7.03
128.10
14.17
>100%
1/26/2011
IS #05
7.08
47.75
10.83
>100%
1/26/2011
IS #06
7.461
93.52
12.06
>100%
1/26/2011
IS #07
6.98
52.71
13.44
>100%
1/26/2011
IS #08
6.83
41.01
13.01
>100%
1/26/2011
IS #10
7.31
61.20
12.87
>100%
1/26/2011
IS #11
7.54
68.96
12.42
>100%
1/26/2011
SDO 004
7.30
18.17
31.8
8.5
100
>100%
<10.0
<10.0
1/26/2011
SDO 006
6.91
28.42
2.2
0.161
8
>100%
<10.0
<10.0
1/26/2011
SDO16A
7.12
22.49
3.2
<0.10
23
>100%
<10.0
<10.0
1/26/2011
SDO 024
7.39
9.70
186
0.643
294
>100%
<10.0
125
1/26/2011
SDO 026
7.24
39.60
3.2
0.836
28
40.61%
<10.0
<10.0
1/26/20111
SDO 027
7.01
16.08
61.51
0.676
92
1
1
>100%
<10.0
22.2
1/26/20111
SDO 030
7.18
26.46
3
0.313
251
1
>100%
<10.0
<10.0
1/26/20111
SDO 033
7.68
13.12
234
<0.10
3371
1 1
1
>100%
<10.0
46.4
3/16/2011
SDO 004
None
No
2
1
1
Yes
No
No
No
7.36
10.28
4.571
4
1.01
12
<0.11
2.41
<0.050
<5.0
3/16/2011
SDO 005
None
No
1
1
1
No
No
No
No
3/16/2011
SDO 006
None
No
1
1
1
No
No
No
No
6.64
4.99
<2
2
<0.10
16
<0.1
0.09
<0.050
<5.0
3/16/2011
SDO 007
None
No
1
1
1
Yes
No
No
No
3/16/2011
SDO 008
None
No
1
1
1
No
No
No
No
3/16/2011
SDO 009
None
No
1
1
1
No
No
No
No
3/16/2011
SDO 019
None
No
1
1
1
No
Yes
No
No
3/16/20111
SDO 024 1
None
No
1
1
1
No
No I
No I
No
6.831
1.96
2.15
15
0.694
23
<0.1
0.141
<0.050
5
Piedmont Triad International Airport NCS000508
NPDES Permit Renewal Application Sheet 2.of 13 1211012014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Visual and Analytical Data Summary (continued)
Date Location
Color Odor Clarity FS SS Foam Sheen Eros.Dep. Other
pH Turb. D.O. BOD TSS NH3 N COD WAS NO,+No, N Total P O&G AT EG PG
3/16/20111
SDO 025
None
No
1 1
1
2 1
No
No
No
No
3/16/2011
SDO 026
None
No
1
1
1
No
No
No
No
6.51
3.251
5.6
2
0.892
24
<0.1
1.67
<0.050
<5.0
3/16/2011
SDO 027
None
No
1
1
1
No
No
No
No
6.73
6.101
10.3
6.67
0.308
40
<0.1
0.866
<0.050
<5.0
3/16/2011
SDO 028
None
No
1
1
1
No
No
No
No
3/16/2011
SDO 029
None
No
2
1
2
No
No
No
No
3/16/2011
SDO 030
None
No
1
1 •
1
No
No
No
No
6.66
10.39
2.3
14.2
<0.10
27
<0.1
0.574
<0.050
<5.0
3/16/2011
SDO 031
None
No
2
1
1
No
No
No
No
3/16/2011
SDO 033
None
No
1
1
1
No
No
No
No
8.431
3.99
15.83
6
0.113
331
<0.1
0.348
<0.050 1<5.01
3/16/2011
SDO 036
None
No
1
1
1
No
No
No
No
4/9/2011
IS #01
7.31
12.521
9.07
>100%
4/9/2011
IS #02
7.22
38.97
9.36
>100%
4/9/2011
IS #05
6.99
42.14
9.05
>100%
4/9/2011
IS #06
7.23
22.19
9.42
>100%
4/9/2011
IS #07
6.83
12.08
8.86
>100%
4/9/20111
IS #08
7.34
19.17
10.01
>100%
IS #10
6.97
32.04
9.73
>100%
/9/2011
IS #11
7.36
36.15
10.51
>100%
/9/2011
SDO 004
7.07
32.87
<2
0.315
8
>100%
<10.0
<10.0
[4/9/2011
/9/2011
SDO 006
6.60
14.22
<2
<0.10
9
>100%
<10.0
<10.0
/9/2011
SDO 024
7.37
18.94
<2
<0.10
25
>100%
<10.0
<10.0
/9/2011
SDO 026
6.74
11.10
<2
0.196
13
>100%
<10.0
<10.0
4/9/2011
SDO 027
6.83
8.97
10.1
<0.10
20
>100%
<10.0
<10.0
4/9/20111
SDO 030
6.79
9.63
<2
<0.10
<5
>100%
<10.0
<10.0
4/9/20111
SDO 033
1
8.921
13.841
1 7.71
<0.101
101
1
1
>100%
<10.0
<10.0
5/23/20111
SDO 004
1
2.53
5/23/2011
SDO 027
1
2.19
5/23/20111
SDO 033
1
1
1
j 2.941
1
1 14
6/10/2011
SDO 004
None
No
1
2
1
Yes
No
No
I No
7.051
5.22
1 <2
<1.0
<0.10
<51
<0.1
1.22
<0.050
<5.0
6/10/2011
SDO 007
None
No
1
1
1
Yes
No
No
No
6/10/2011
SDO 008
None
No
1
1
1
No
No
No
No
6/10/2011
SDO 019
None
No
1
2
1
No
No
No
No
6/10/2011
SDO 020
None
No
1
1
1
No
No
No
No
6/10/2011
SDO 026
None
No
1
1
1
No
No
No
No
6.89
7.12
<2
<1.0
0.347
8
<0.1
0.696
0.119
<5.0
6/10/2011
SDO 027
None
No
1
2
2
No
No
No
No
6.64
6.83
<2
<1.0
<0.10
<5
1.28
<0.050
<5.0
6/10/20111
SDO 033
None
No
1
1
1
No
No
No
I No
8.211
5.03
j
1 3.6311
4
0.36111
12
<0.11
0.465
0.069
<5.0
9/21/20111
SDO 004
None
No
1
1 2
1
No
No
No
No
7.67
31.301
2.69
7.51
0.126
151
0.103
1.24
<0.050
<5.0
9/21/2011
SDO 007
None
No
1
1
2
Yes
No
No
No
9/21/2011
SDO 008
None
No
1
1
1
No
No
No
No
9/21/2011
SDO 019
None
No
1
1
1
Yes
No
No
No
9/21/2011
SDO 024
None
No
1
1
1
No
No
No
No
7.83
30.72
8.5
42
0.334
73
0.107
0.444M0.173<5.09/21/2011SDO
026
None
No
1
1
1
No
No
NoNo
7.08
40.26
6.27
40
0.371
53
0.103
0.6799/21/
0011
SDO 027
None
No
1
1
1
No
No
No
No
6.9018.04
3.68
17.7
0.186
27
<0.1
0.5279/21/2011
SDO 029
None
No
1
1
1
No
No
No
No
9/21/2011
SDO 030
None
No
1
1
1
No
No
No
No
7. 66
14.24
6.27
9
0.378
39
0.544
0.35
9/21/2011
SDO 031
None
No
1
1
1
Yes
No
No
No
Piedmont Triad International Airport NC5000508
NPDES Permit Renewal Application Sheet 3 of 13 1211012014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Visual and Analytical Data Summary (continued)
Date Location
Color Odor Clarity FS SS Foam Sheen Eros.De . Other
pH Turb. D.O. BOD TSS NH3 N COD WAS NO3+NOi-N Total P O&G AT EG PG
9/21/20111
SDO 032
None
No
1
1
1
Yes
No
No
No
9/21/20111
SDO 033
Brown
Yes
1
1
1
No
No
No
No
7.97
12.28
4.28
18.3
<0.10
28
<0.1
0.623
0.06
<5.0
11/4/2011
IS #01
6.53
19.04
10.24
>100%
11/4/2011
IS #02
6.74
51.43
10.09
>100%
11/4/2011
IS #05
6.89
152.50
9.58
>100%
11/4/2011
IS #06
6.61
89.43
9.39
>100%
11/4/2011
IS #07
6.41
48.29
9.98
>100%
11/4/2011
IS #08
6.52
22.43
10.47
>100%
11/4/2011
IS #10
6.68
67.75
10.32
>100%
11/4/2011
IS #11
6.60
38.24
9.31
>100%
11/4/2011
SDO 004
6.37
23.98
4.1
<0.10
24
>100%
<10.0
<10.0
11/4/2011
SDO 006
6.46
32.04
5.9
<0.10
33
>100%
<10.0
<10.0
11/4/2011
SDO16A
6.48
33.10
<2
<0.10
20
<10.0
<10.0
11/4/2011
SDO 024
8.10
10.33
3.05
<0.101
15
>100%
<10.0
<10.0
11/4/2011
SDO 026
7.22
23.03
2.45
<0.10
19
>100%
<10.0
<10.0
11/4/2011
SDO 027
6.77
19.03
8.94
<0.10
26
>100%
<10.0
<10.0
11/4/2011
SDO 030
6.85
48.73
4.86
<0.10
10
>100%
<10.0
<10.0
11/4/20111
SDO 033
1
1
1
7.291
40.681
3.55
<0.10
33
>100%
<10.0
<10.0
12/7/2011
SDO 001
None
No
1
1
1
No
No
No
No
12/7/2011
SDO 002
None
No
1
1
1
No
No
No
No
12/7/2011
SDO 004
None
No
1
1
1
Yes
No
No
No
7.47
36.46
2.03
23
<0.10
12
<0.1
0.3511
0.223
<5.0
12/7/2011
SDO 006
Brown
No
3
1
2
No
No
No
No
7.97
75.64
3.86
101
<0.10
51
<0.1
0.116
0.268
<5.0
12/7/2011
SDO 007
None
No
2
1
1
Yes
No
No
No
12/7/2011
SDO 008
None
No
1
1
1
No
No
No
No
12/7/20111
SDO 009
None
No
1
1
1
No
No
No
No
12/7/2011
SDO 013
None
No
1
1
1
No
No
No
No
12/7/2011
SDO 015
None
No
1
1
1
No
No
No
No
12/7/2011
SDO 016
None
No
1
1
1
No
No
No
No
12/7/2011
SDO16A
None
No
2
2
1
Yes
No
No
No
7.56
49.53
2.53
23
<0.10
23
<0.1
0.273
0.202
<5.0
12/7/2011
SDO 017
None
No
1
1
1
No
No
No
No
12/7/2011
SDO 019
None
No
1
1
1
No
No
No
No
12/7/2011
SDO 020
None
No
1
1
1
No
No
No
No
12/7/2011
SDO 023
None
No
1
1
1
No
No
No
No
12/7/2011
SDO 024
None
No
1
1
1
No
No
No
No
7.09
20.11
18.7
2.5
<0.10
44
<0.1
<0.050
0.193
<5.0
12/7/2011
SDO 025
None
No
1
1
1
No
No
No
No
12/7/2011
SDO 026
None
No
1
1
2
Yes
No
No
No
6.96
24.87
<2
9
<0.10
13
<0.1
0.233
0.202
<5.0
12/7/2011
SDO 027
None
No
1
1
1
No
No
No
No
7.11
23.61
3.03
5
<0.10
12
<0.1
0.082
0.202
<5.0
12/7/20111
SDO 028
None
No
1
1
1
No
No
No
No
12/7/2011
SDO 029
None
No
1
1
1
No
No
No
No
12/7/2011
SDO 030
None
No
1
1
1
No
No
No
No
7.13
23.23
<2
9.5
<0.10
15
<0.1
<0.050
0.214
<5.0
12/7/2011
SDO 031
None
No
1
1
1
No
No
No
No
12/7/2011
SDO 033
None
No
1
1
2
Yes
No
No
No
6.52
45.29
'
3.81
6
<0.10
14
<0.1
0.226j
0.205
<5.0
12/7/2011
SDO 036
one
No
1
1
1
Yes
No
No
No
12/21/2011
15 #01
6.63
21.85
10.99
>100%
12/21/2011
IS #02
6.35
94.93
10.81#-1
>100%
12/21/2011
IS #05
6.35
38.63
8.911
>100%
-1
Piedmont Triad International Airport - NCS000508
NPDES Permit Renewal Application Sheet 4 of 13 1211012014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Visual and Analytical Data Summary (continued)
Date Location
Color Odor Clarity FS SS Foam Sheen Eros.De . Other
pH Turb. D.O. SOD TSS NH3 N COD MBAS NO,+NO,-N Total P O&G AT EG PG
12/21/2011
IS #06
6.48
145.50
10.26
>100%
12/21/2011
IS #07
6.96
65.74
10.51
>100%
12/21/2011
15 #08
6.491
116.10
10.50
>100%
12/21/2011
IS #10
6.531
115.901
11.85
>100%
12/21/2011
IS #11
6.50
162.20
10.80
>100%
12/21/2011
SDO 004
6.71
35.54
3.1
<0.10
24
>100%
<10.0
<10.0
12/21/2011
SDO 006
6.74
119.40
2.05
<0.10
21
>100%
<10.0
<10.0
12/21/2011
SDO16A
6.55
32.08
2.55
<0.10
25
<10.0
<10.0
12/21/2011
SDO 024
6.20
18.45
7.58
<0.10
19
>100%
<10.0
<10.0
12/21/2011
SDO 026
6.50
17.76
<2
<0.10
11
>100%
<10.0
<10.0
12/21/2011
SDO 027
6.36
15.941
2.05
<0.10
18
>100%
<10.0
<10.0
12/21/2011
SDO 030
6.28
10.63
<2
<0.10
5
>100%
<10.0
<10.0
12/21/2011
SDO 033
6.80
14.54
2.15
F <0.10
12
>100%
<10.0
<10.0
1/21/2012
IS #01
7.25
16.03
15.28
>100%1
1/21/2012
IS #02
6.65
31.20
11.96
>100%
1/21/2012
IS #05
6.71
18.98
11.23
>100%
1/21/2012
IS #06
6.81
32.72
11.34
>100%
1/21/2012
IS #07
7.82
14.29
12.32
>100%
1/21/2012
IS #08
7.17
17.78
12.34
>100%
1/21/2012
IS #10
7.08
19.27
12.86
>100%
1/21/2012
IS #11
7.17
14.30
15.80
>100%
1/21/2012
SDO 004
7.35
49.83
2.25
<0.10
20
>100%
<10.0
<10.0
1/21/2012
SDO 024
7.40
9.32
68.2
<0.10
120
>100%
<10.0
58.4
1/21/2012
SDO 026
6.99
12.96
2.05
0.138
17
>100%
<10.0
<10.0
1/21/2012
SDO 027
6.97
14.51
12
<0.10
241
>100%
<10.0
<10.0
1/21/2012
SDO 030
6.491
11.87
<2
0.106
11
>100%
<10.0
<10.0
1/21/2012
SDO 033
8 47F
10.58
20.4
<0.10
34
>100%
<10.0
<10.0
2/23/2012
IS #01
6.681
15.35
>100%
2/23/2012
IS #02
6.92
11.07
11.51
>100%
2/23/2012
IS #05
6.74
16.98
13.45
>100%
2/23/2012
IS #06
6.88
22.09
15.68
>100%1
2/23/2012
IS #07
6.61
10.55
15.47
>100%
2/23/2012
IS #08
7.27
16.74
15.83
>100%
2/23/2012
IS #10
6.53
31.99
15.26
>100%
2/23/2012
IS #11
7.18
17.35
16.32
>100%
2/23/2012
SDO 004
7.70
23.27
30.2
<0.10
72
>100%
<10.0
22.7
2/23/2012
SDO 006
7.00
0.84
<2
<0.101
12
>100%
<10.0
<10.0
2/23/2012
SDO16A
6.92
31.20
<2
<0.101
25
>100%
<10.0
<10.0
2/23/2012
SDO 026
6.94
3.14
<2
4.121
19
>100%
<10.0
<10.0
2/23/2012
SDO 027
6.95
9.05
196
0.3641
357
>100%
<10.0
190
2/23/20121
SDO 033
7.241
12.541
281
<0.10
407
I >100%
<10.01
201
3/21/2012
IS #02
11.42
3/21/2012
IS #06
34.72I
3/21/2012
IS #10
205.40
3/21/2012
SDO 001
None
No
2
1
1
Yes
No
No
Yes
3/21/2012
SDO 002
None
No
2
1
1
Yes
No
No
Yes
Piedmont Triad International Airport NC5000508
NPDES Permit Renewal Application Sheet 5 of 13 1211012014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Visual and Analytical Data Summary (continued)
Date Location
Color Odor Clarity FS SS Foam Sheen Eros.Dep. Other
pH Turb. D.O. BOD TSS NH3-N COD WAS NO,+No, N Total P O&G AT EG PG
3/21/2012
SDO 004
None
No
2
1
1
Yes
No
No
Yes
6.61
25.431
13.8
3.5
<0.10
38
0.1
0.598
<0.050
<5.0
3/21/2012
SDO 005
None
No
1
1
1
No
No
No
No
3/21/2012
SDO 006
Red -Brown
No
1
1
1
No
No
No
No
6.40
12.611
8.13
2.33
<0.10
17
<0.1
0.101
<0.050
<5.0
3/21/2012
SDO 007
None
No
1
1
2
Yes
No
No
No
3/21/2012
SDO 008
None
No
1
1
1
No
No
No
No
3/21/2012
SDO16A
None
No
3
1
2
Yes
No
No
Yes
6.74
92.95
13
22.7
<0.10
73
<0.1
0.11
<0.050
<5.0
3/21/20121
SDO 019
None
No
1
1
1
Yes
No
No
Yes
3/21/2012
SDO 020
None
No
1
1
1
No
No
No
No
3/21/2012
SDO 023
None
No
1
1
1
No
No
No
No
3/21/2012
SDO 026
None
No
1
1
1
No
No
No
No
6.45
2.51
3.37
3.67
0.166
13
0.112
0.68
<0.050
<5.0
3/21/2012
SDO 027
None
No
1
1
1
No
No
No
No
6.10
10.56
16
12.5
0.248
63
<0.1
0.972
<0.050
<5.0
3/21/2012
SDO 028
None
No
1
1
1
No
No
No
No
3/21/2012
SDO 031
None
2
1
2
No
No
No
No
3/21/20121
SDO 033
None
No
2
1
2
No
No
No
No
7.14
31.45
10.5
11
0.149
80
<0.1
0.327
<0.050,
<5.0
3/21/2012
SDO 036
None
No
1
1
1
No
No
No
No
3/21/2012
SDO 038
None
No
1
1
1
No
No
No
No
3/21/2012
SDO 040
Red -Brown
No
2
1
2
No
No
No
No
3/21/2012
SDO 062
None
No
1
1
1
No
No
No
No
5/6/2012
SDO 001
Red -orange
No
2
1
1
Yes
No
No
Yes
6/6/2012
SDO 002
None
No
1
1
2
No
No
No
No
6/15/20121
SDO 004
None
No
1
1
1
Yes
No
No
Yes
7.84
10.91
5.97
19
<0.10
43
0.12
0.336
0.138
<5.0
5/6/2012
SDO 005
None
No
1
1
1
No
No
No
No
5/6/2012
SDO 006
None
No
1
1
1
No
No
No
No
7.49
10.51
4.33
14
<0.10
28
<0.1
<0.050
0.139
<5.0
6/6/2012
SDO 007
None
No
1
1
2
Yes
No
No
Yes
6/6/2012
SDO 008
None
No
1
1
1
No
No
No
No
6/6/2012
SDO 009
None
No
1
1
1
No
No
No
No
6/6/2012
SDO 16A '
None
No
2
2
2
No
No
No
No
6.84
21.50
7.17
10.5
<0.10
45
<0.1
0.386
0.164
<5.0
6/6/2012
SDO 017
None
No
1
1
1
No
No
No
No
6/6/2012
SDO 019
Yellow -Brown
NO
2
1
2
No
No
No
No
6/6/2012
SDO 020
None
No
1
1
1
No
No
No
No
6/6/2012
SDO 023
None
No
1
2
1
No
No
No
No
6/6/2012
SDO 024
None
No
1
1
1
No
No
No
No
6.85
2.31
2.19
2
<0.10
17
<0.1
<0.050
0.059
<5.0
6/6/2012
SDO 026
None
No
1
2
1
No
No
No
No
6.64
10.50
2.79
5.5
<0.10
16
<0.1
0.488
0.061
<5.0
6/6/2012
SDO 027
None
No
1
1
1
No
No
No
No
6.53
7.64
2.79
17.5
<0.10
17
<0.1
0.316
0.086
<5.0
6/6/2012
SDO 028
None
No
1
1
1
No
No
No
No
6/6/2012
SDO 029
None
No
1
1
2
No
No
No
No
6/6/2012
SDO 031
None
No
2
1
1
No
No
No
No
6/6/2012
SDO 033
None
No
1
1
1
No
No
No
No
7.15
4.30
2.29
1.67
<0.10
11
<0.1
0.765
0.062
<5.0
6/6/2012
SDO 036
None
No
1
1
1
No
No
No
No
6/6/20121
SDO 040
None
No
1
1
1
No
No
No
No
9/23/2012
SDO 001
None
No
1
2
1
No
No
No
No
9/23/2012
SDO 002
None
No
1
1
1
No
No
No
No
9/23/2012
SDO 004
None
No
1
1
1
Yes
No
No
Yes
8.40
42.76
2.49
8
<0.10
6
<0.1
0.075
0.07
<5.0
9/23/2012
SDO 005
None
No
1
1
1
No
No
No
No
9/23/2012
SDO 007
None
No
1
1
1
No
No
No
No
Piedmont Triad International Airport NCS000508
NPDES Permit Renewal Application Sheet 6 of 13 1211012014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Visual and Analytical Data Summary (continued)
Date Location
Color Odor Clarity FS SS Foam Sheen Eros.Dep. Other
pH Turb. D.O. BOD TSS NH;-N COD WAS NO3+NO2 N Total P O&G AT EG PG
9/23/2012
SDO 008
None
No
1
1
1
No
No
No
No
9/23/2012
SDO 019
None
No
2
1
2
No
No
No
No
9/23/2012
SDO 020
None
No
1
1
1
No
No
No
No
9/23/2012
SDO 026
None
No
1
11
1
No
No
No
No
7.75
19.38
<2
2.5
0.111
6
<0.1
0.463
0.086
<5.0
9/23/2012
SDO 027
None
No
1
1
1
No
No
No
No
7.38
9.57
<2
3.33
<0.10
9
<0.1
0.159
<0.050
<5.0
9/23/2012
SDO 031
None
No
1
2
1
No
No
No
No
9/23/20121
SDO 036
None
No
1
1
1
No
No
No
No
12/8/2012
SDO 001
Red -Orange
NO
2
1
1
No
No
NO
No
12/8/2012
SDO 002
None
No
1
1
1
No
No
No
No
12/8/2012
SDO 004
None
Yes
2
2
3
Yes
Yes
No
Yes
6.86
13.91
<2
6.5
0.251
8
<0.1
1.391
0.052
5.7
12/8/2012
SDO 005
None
No
1
1
1
No
No
No
No
12/8/2012
SDO 007
None
No
1
1
1
Yes
No
No
Yes
12/8/2012
SDO 008
None
No
1
1
1
No
No
No
No
12/8/20121
SDO 019
None
No
1
2
1
No
No
No
No
12/8/20121
SDO 020
None
No
1
1
1
No
No
No
No
12/8/20121
SDO 025
None
No
1
1
1
No
No
No
No
1
12/8/2012
SDO 026
None
No
1
2
3
No
Yes
No
Yes
6.69
3.50
2.1
3.5
<0.10
13
<0.1
1.13
<0.050
<5.0
12/8/2012
SDO 027
None
No
1
2
2
No
Yes
No
Yes
6.61
4.19
6.02
4
<0.10
16
<0.1
0.743
<0.0501
<5.0
12/8/2012
SDO 028
None
No
1
1
1
No
No
No
No
12/8/2012
SDO 031
Red -orange
No
1
1
2
No
No
No
No
12/17/2012
IS #01
6.721
1.82
10.06
>100%
12/17/2012
IS #02
6.84
8.80
11.62
>100%
12/17/2012
IS #05
6.50
4.79
9.27
>100%
12/17/2012
IS #06
6.98
5.71
9.87
>100%
12/17/2012
IS #07
6.20
5.32
9.05
>100%
12/17/2012
IS #08
8.25
24.22
14.16
>100%
12/17/2012
IS #10
6.15
6.72
9.73
>100%
12/17/2012
IS #11
6.53
6.271
11.44
>100%
12/17/2012
SDO 004
6.67
4.661
1 <2
0.4381
15
>100%
<10.0
<10.0
12/17/2012
SDO 026
6.61
2.821
1 2
0.171
8
>100%
<10.0
<10.0
12/17/2012
SDO 027
6.35
2.011
1 6.42
<0.10
30
>100%
<10.0
14.8
1/11/2013
IS #D1
6.65
9.321
14.12
>100%
1/11/2013
IS #02
6.78
21.71
20.02
>100%
1/11/2013
15 #05
7.12
49.01
15.36
>100%
1/11/2013
IS #06
6.46
33.46
13.51
>100%
1/11/2013
IS #07
6.18
8.70
13.59
>100%
1/11/2013
IS #08
6.10
11.531
17.34
>100%
1/11/2013
IS #10
6.63
34.18
16.34
>100%
1/11/20131
IS #11
6.64
8.501
15.53
>100%
1/11/2013
SDO 004
6.76
9.55
2.11
0.186
<5
>100%
<10.0
<10.0
1/11/20131
SDO 026
6.92
6.05
2.01
0.123
8
>100%
<10.0
<10.0
1/11/20131
SDO 027
6.54
3.99
188
0.11
3371
1
1
>100%
13.71
264
1/18/20131
IS #01
6.351
40.34
25.43
>100%
1/18/2013
IS #02
6.32
33.29
15.52
>100%
1/18/2013
IS #05
6.25
27.91
14.61
>100%
1/18/2013
IS #06
6.05
43.52
20.06
>100%
Piedmont Triad International Airport NCS000508
NPDES Permit Renewal Application Sheet 7 of 13 1211012014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Visual and Analytical Data Summary (continued)
Date Location
Color Odor Clarity FS SS Foam Sheen Eros.De . Other
pH Turb. D.O. BOD TSS NH3-N COD WAS NO,+NOi N Total P O&G AT EG PG
1/18/2013
IS #07
7.05
62.82
10.47
>100%
1/18/2013
15 #08
6.14
18.23
15.83
>100%
1/18/2013
IS #10
6.28
11.92
19.25
>100%
1/18/2013
IS #11
6.48
38.46
21.14
>100%
1/18/2013
SDO 004
6.31
32.18
23.7
0.138
38
>100%
<10.0
34.1
1/18/2013
SDO 006
6.81
7.50
<2
0.106
<5
>100%
<10.0
<10.0
1/18/2013
SDO16A
6.55
28.57
<2
<0.10
<5
>100%
<10.0
<10.0
1/18/2013
SDO 024
6.70
4.54
1,800
<0.10
2,700
>100%
13.6
3,360
1/18/2013
SDO 026
6.01
12.11
110
0.304
148
>100%
<10.0
<10.0
1/18/2013
SDO 027
6.85
8.73
320
0.254
537
>100%
<10.0
413
1/18/2013
SDO 030
6.74
10.94
<2
<0.10
9
>100%
<10.0
<10.0
1/18/2013
SDO 033
6.29
24.31
398
<0.10
595
>100%
<10.0
388
1/26/2013
IS #01
6.99
23.07
11.08
>100%
1/26/2013
IS #02
6.83
13.73
12.11
>100%
1/26/2013
IS #05
6.80
10.99
10.83
>100%
1/26/2013
IS #06
7.08
11.30
12.19
>100%
1/26/2013
IS #07
6.01
85.63
7.67
>100%
1/26/2013
IS #08
7.50
3.59
12.68
>100%
1/26/2013
IS #10
7.29
49.97
11.86
>100%
1/26/2013
IS #11
6.75
19.40
12.32
>100%
1/26/2013
SDO 004
7.46
79.92
123
0.349
189
>100%
<10.0
15
1/26/2013
SDO 026
6.40
8.92
872
9.86
1,360
>100%
13.6
16.3
1/26/2013
SDO 027
7.09
11.21
16,900
1 0.594
28,600
>100%
2,7501
30,300
2/20/20131
SDO 026
5.11
20
2/20/20131
SDO 027
153
226
3/6/20131
SDO 001
Orange
No
2
1
1
No
No
No
No
3/6/2013
SDO 002
None
No
1
1
1
No
No
No
No
3/6/2013
SDO 004
None
No
1
2
2
Yes
No
No
Yes
6.71
15.19
3.22
6
<0.10
33
<0.1
0.678
<0.050
<5.0
3/6/2013
SOO 005
None
No
1
1
1
No
No
No
No
3/6/2013
SOO 007
None
No
1
1
1
Yes
No
No
Yes
3/6/2013
SOO 008
None
No
1
1
1
No
No
No
No
3/6/2013
SOO 009
None
No
1
1
1
No
No
No
No
3/6/2013
SDO 017
None
No
1
1
1
No
No
No
No
3/6/2013
SOO 019
None
No
1
1
1
No
No
No
No
3/6/20131
SOO 020
None
No
1
1
1
No
No
No
No
3/6/2013
SDO 026
None
No
1
2
1
No
No
No
No
6.61
3.50
<2
2
<0.10
17
<0.1
0.751
<0.050
<5.0
3/6/2013
SDO 027
None
No
1
1
1
No
No
No
No
6.44
4.91
25.9
2
<0.10
54
<0.1
0.14
<0.050
<5.0
3/6/2013
SDO 033
None
Yes
1
1
1
No
No
Yes
No
9.12
3.20
39.1
7.5
<0.10
68
<0.1
0.693
<0.050
<5.0
3/6/2013
SDO 036
None
No
1
1
1
No
No
No
No
3/6/2013
SDO 040
None
No
1
1
1
No
No
No
I No
3/22/20131
SDO 026
1
1
77
1
1
1 <2
<5
3/22/20131
SDO 027
1
1
1
1 2.511
1
1 6
4/23/20131
SDO 027
1
1
1
1
1
1
1 <2
1 71
6/3/20131
SDO 001
None
I No
1 1
2
1
LNO
No
No
No
6/3/20131
SDO 002
Orange
No
1
1
1
No
No
No
No
6/3/20131
SDO 003
None
No
1
1
1
No
No
No
No
Piedmont Triad International Airport NCS000508
NPDES Permit Renewal Application Sheet 8 of 13 1211012014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Visual and Analytical Data Summary (continued)
Date Location
Color Odor Clarity FS SS Foam Sheen Eros.De . Other
pH Turb. D.O. BOD TSS NH3 N COD WAS NO3+NOi N Total P O&G AT EG PG
6/3/2013
SOO 004
None
No
2
2
2
Yes
No
No
Yes
7.41
13.83
1 7.361
33
<0.101
63
<0.1
0.3811
0.421
<5.0
6/3/2013
SOO 005
None
No
1
1
2
No
No
No
No
6/3/2013
SOO 007
None
No
1
2
1
Yes
No
No
Yes
6/3/2013
SDO 008
None
No
1
1
1
No
No
No
No
6/3/2013
SDO 009
None
No
1
1
1
No
No
No
No
6/3/2013
SDO16A
None
No
3
1
2
No
No
No
No
6.46
44.28
3.17
11
<0.10
39
<0.1
0.154
0.073
<5.0
6/3/2013
SDO 019
None
No
1
1
1
No
No
No
No
6/3/2013
SOO 020
None
No
1
1
1
No
No
No
No
6/3/2013
SOO 025
None
No
2
1
1
No
No
No
No
6/3/2013
SOO 026
None
No
1
1
1
No
No
No
No
6.38
8.33
2.57
4.5
0.216
24
<0.1
0.711
<0.050
<5.0
6/3/2013
SOO 027
None
No
1
1
1
No
No
No
No
6.48
4.15
2.07
3
<0.10
15
<0.1
0.412
<0.050
<5.0
6/3/2013
SOO 031
None
No
1
1
1
No
No
No
No
6/3/2013
SDO 036
None
No
1
1
1
No
No
No
No
6/3/20131
SDO 040
None
No
1
1
1
No
No
No
No
9/22/2013
SDO 001
Orange
No
2
1
2
No
No
No
No
9/22/2013
SDO 002
Orange
No
2
1
2
No
No
No
No
9/22/2013
SDO 004
Orange
No
2
1
2
Yes
No
No
Yes
7.03
93.79
3.51
49
0.207
23
<0.1
0.523
0.145
<5.0
9/22/2013
SDO 005
None
No
1
1
1
No
No
No
No
9/22/2013
SDO 007
None
No
1
1
1
No
No
No
No
9/22/2013
SDO 008
None
No
1
1
1
No
No
No
No
9/22/2013
SDO 009
None
No
1
1
1
No
No
No
No
9/22/2013
SDO 019
None
No
1
1
1
No
No
No
No
9/22/2013
SDO 026
None
No
1
1
1
No
No
No
No
6.64
6.50
<2
3
0.17
19
<0.1
0.939
0.058
<5.0
9/22/2013
SOO 027
None
No
1
1
1
No
No
No
No
6.08
11.29
<2
2.5
<0.10
65
<0.1
0.504
0.052
<5.0
9/22/2013
SOO 029
None
No
1
1
1
No
No
No
No
9/22/2013
SOO 031
Orange
No
2
1
1
No
No
No
No
9/22/20131
SOO 038
None
No
1
1
1
No
No
No
No
9/22/2013
SOO 040
None
No
1
1
1
No
No
No
No
9/22/2013
SOO 062
None
No
1
1
1
No
No
No
No
11/26/2013
IS #01
6.91
39.391
11.70
1
>100%
11/26/2013
IS #02
7.00
106.80
13.66
>100%
11/26/2013
IS #05
6.3S
25.10
13.42
>100%
11/26/2013
IS #06
7.13
113.80
13.60
>100%
11/26/2013
IS #07
6.24
59.76
13.53
>100%
11/26/2013
IS #08
5.76
87.86
12.13
>100%
11/26/2013
IS #10
7.58
106.60
13.76
>100%
11/26/2013
IS #11
7.90
58.91
13.99
>100%
11/26/2013
SDO 001
Orange
No
1
1
2
No
No
No
11/26/2013
SDO 002
None
No
1
1
1
No
No
No11/26/2013
SDO 003
Red -orange
No
1
1
3
No
No
No11/26/2013
rNo
SDO 004
Red -orange
No
2
2
3
Yes
No
No
7.54
92.59
6.48
86
0.244
33
<0.1
0.108
0.236
<5.0
>100%
<10.0
13.911/26/2013
SDO 005
None
No
1
1
2
No
No
No
11/26/20131
S00006
None
No
1
1
2
No
No
No
No
6.49
73.39
8.28
50
0.426F
32
<0.1
0.145
0.103
<5.0
>100%
<10.0
<10.0
11/26/2013
SDO 007
None
No
1
1
1
No
No
No
No
11/26/20131
SOO 008
None
No
1
1
3
No
No
No
No
Piedmont Triad International Airport NCS000508
NPDES Permit Renewal Application Sheet 9 of 13 1211012014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Visual and Analytical Data Summary (continued)
Date Location
Color Odor Clarity FS SS Foam Sheen Eros.Dep. Other
pH .Turb. D.O. BOD TSS NH3-N COD WAS NO3+NOS N Total P O&G AT EG PG
11/26/2013
SDO 009
None
No
1
1
1
No
No
No
No
11/26/2013
SDO 014
None
No
1
2
3
No
No
No
No
11/26/2013
SDO16A
None
No
1
1
1
Yes
No
No
Yes
7.34
21.63
2.96
16
<0.10
20
<0.1
0.145
0.103
<5.0
>100%
<10.0
<10.0
11/26/2013
SDO 019
None
No
1
2
1
No
No
No
No
11/26/2013
SDO 020
None
No
1
1
1
No
No
No
No
11/26/2013
SDO 023
None
No
1
1
1
No
No
No
No
11/26/20131
SDO 024
None
No
1
1
1
No
No
No
No
6.27
24.80
22.6
14.3
<0.101
45
<0.1
0.061
0.052
<5.01
>100%
<10.0
32
11/26/20131
SDO 025
None
No
1
1
1
No
No
No
No
11/26/20131
SDO 026
None
No
1
1
1
No
No
No
No
6.87
1 8.43
2.86
8
<0.10
15
<0.1
0.249
<0.050
<5.0
>100%
14
11.9
11/26/20131
SDO 027
None
No
1
1
1
No
No
No
No
7.12
6.71
6.02
8
<0.10
15
<0.1
0.092
<0.050
<5.0
>100%
<10.0
14.8
11/26/2013
SDO 028
Orange
No
2
4
4
Yes
No
No
Yes
11/26/2013
SDO 030
None
No
1
1
1
No
No
No
No
<2
3
0.138
11
<0.1
<0.050
<0.050
<5.0
>100%
<10.0
<10.0
11/26/2013
SDO 031
None
No
1
1
2
No
No
No
No
11/26/2013
SDO 033
None
No
1
1
1
No
No
Yes
No
6.69
4.09
13.5
14
<0.10
27
<0.1
0.352
<0.050
<5.01
>100%
<10.0
22
11/26/2013
SDO 036
None
No
1
1
1
No
No
No
No
11/26/2013
SDO 038
None
No
1
1
1
No
No
No
No
11/26/20131
SDO 040
None
No
1
1
1
No
No
No
No
11/26/20131
SDO 062
None
No
1
1
1 1
No
No
No
No
12/29/2013
IS #01
6.26
11.11
15.32
>100%
12/29/2013
IS #02
6.58
89.58
13.86
>100%
12/29/2013
IS #05
6.43
. 180.30
12.93
>100%
12/29/2013
IS #06
6.94
171.70
13.02
>100%
12/29/2013
IS #07
6.14
47.57
13.22
>100%
12/29/2013
IS #08
6.24
62.95
13.54
>100%
12/29/2013
15 #10
6.81
141.90
15.03
>100%
12/29/2013
IS #11
7.93
70.36
13.82
>100%
12/29/2013
SDO 004
6.78
160.80
<2
0.176
27
>100%
<10.0
<10.0
12/29/2013
SDO16A
6.44
23.66
11.4
<0.10
34
>100%
<10.0
<10.0
12/29/2013
SDO 024
6.63
23.60
2.34
<0.10
11
>100%
<10.0
12.3
12/29/2013
SDO 026
6.64
27.32
<2
<0.10
20
>100%
<10.0
<10.0
12/29/2013
SDO 027
6.52
17.65
3.04
<0.10
211
>100%
<10.0
11.8
12/29/20131
SDO 030
1
6.46
9.00
<2
1 <0.10
10
>100%
<10.0
<10.0
12/29/20131
SDO 033
6.37
8.13
7.98
<0.10
14
>100%
<10.01
12.7
1/22/2014
IS #01
6.56
24.28
13.41
>100%
1/22/2014
IS #02
6.87
12.93
13.73
>100%
1/22/2014
IS #05
6.52
11.55
12.97
>100%
1/22/2014
IS #06
6.47
8.97
14.90
>100%
1/22/2014
IS #07
6.22
1.52
10.71
>100%
1/22/2014
IS #08
6.06
3.14
11.43
>100%
1/22/2014
IS #10
6.70
9.27
12.92
>100%
1/22/2014
IS #11
r
7.12
25.60
14.58
>100%
1/22/2014
SDO 001
Orange
No
2
1
2
No
No
No
No
1/22/2014
SDO 002
None
No
1
1
1
No
No
No
No
1/22/2014
SDO 004
None
No
1
1
1
No
No
No
No
6.37
12.38
<2
9
0.125
<5
<0.1
1.2
<0.050
<5.0
>100%
<10.0
<10.0
1/22/2014
SDO 005
None
No
1
1
1
No
No
No
No
1/22/2014
SDO 007
None
No
1
1
1
No
No
No
No
Piedmont Triad International Airport NC5000508
NPDES Permit Renewal Application Sheet 10 of 13 1211012014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Visual and Analytical Data Summary (continued)
Date
1/22/2014
Location
SDO
Color
Odor
Clarity
FS
SS
Foam
Sheen
Eros.De
. Other
pH
Turb.
D.O.
BOD
TSS
NH3-N
COD
WAS
NO3+NOi-N
Total P
O&G
AT
EG
PG
008
None
No
1
1
1
No
No
No
No
1/22/20141
SDO 009
SDO 016
None
None
No
No
1
1
1
1
1
1
No
No
No
No
No
No
No
No
1/22/2014
1/22/2014
SDO 018
None
No
1
1
1
No
No
No
No
1/22/2014
SDO 019
None
No
1
1
1
No
No
No
No
1/22/2014
SDO 020
None
No
1
1
1
No
No
No
No
1/22/2014
SDO 026
None
No
1
1
1
No
No
No
No
6.48
1.23
50
<0.1
1.26
0.05
<5.0
>100%
<10.0
<10.0
1/22/2014
SDO 027
None
No
1
1
1
No
No
20
0.203
1/22/2014
SDO 033
None
No
1
1
1
No
No
6.33
0.72
12.5
<0.10
128
<0.1
1.08
0.053
<5.0
>100%
<10.0
100
1/22/2014
SDO 036
None
No
1
1
No
No
Yes
No
6.92
13.07
6
<0.10
20
<0.1
1.95
0.076
<5.0
>100%
<10.0
17.4
1
No
No
No
No
3/4/2014
IS #01
3/4/2014
IS #02
6.76
6.57
12.60
>100%
3/4/2014
IS #05
7.28
5.05
17.05
>100%
3/4/2014
IS #06
7.11
7.46
13.92
>100%
Hi2
3/4/2014
IS #07
7.21
6.00
16.56
>100%
3/4/2014
IS #08
5.80
4.81
12.97
3/4/2014
IS #10
5.32
5.80
11.87
>100%
3/4/2014
IS #11
5.39
9.77
13.81
>100%
3/4/2014
SDO 004
6.89
18.40
12.33
>100%
3/4/2014
SDO 026
54
6.13
13.60
1.52
47
>100%
<10.0
18.7
3/4/2014
SDO 027
6.13
3.60
11.3
11.4
2.18
38
>100%
<10.0
<10.0
3/4/2014
SDO 027
6.73
0.46
62.0
11.6
104
70%
<10.0
<10.0
3/4/2014
SDO 033
6.64
1.76
7,500.0
0.241
13,100
>100%
89.6
46,800
3/29/2014
IS #02
7.13
0.68
121.0
<0.10
128
>100%
<10.0
57.9
3/29/2014
IS #06
5.18
3/29/2014
IS #08
13.71
3/29/2014
IS #10
5.34
3/29/2014
IS #11
7.47
3/29/2014
SDO 004
7 43
3/29/2014
SDO 006
19.32
3/29/2014
SDO 027
12.10
4/30/20141
SDO 027
150
5/16/2014
SDO 001
None
No
4
1
1
No
No
No
No
591
1
5/16/2014
SDO 002
None
No
4
2
1
No
No
No
No
5/16/2014
SDO 003
Red -Brown
No
3
1
1
No
No
No
5/16/2014
SDO 004
Red -Brown
No
2
3
2
Yes
No
#No
No
6.47
27.20
<2
156
5/16/2014
SDO 005
Red -Brown
No
3
2
2
No
No
No
<0.10
34
<0.1
0.503
0.332
<5.0
5/16/2014
SDO 006
None
No
4
2
1
No
No
No
No
6.62
7.63
43
0.162
<0.050
0.320
<5.0
5/16/2014
SDO 007
None
No
4
1
1
7.95
12.0
0.128
No
No I
No
No
5/16/2014
SDO 013
Red -Brown
No
2
3
2
No
No
No
No
5/16/2014
SDO 017
Red -Brown
No
3
3
2
No
No I
No
No
5/16/20141
SDO 018
Red -Brown
Orange -Brown
No
No
3
2
2
2
3
1
No
No
No
No
No
No
No
No
5/16/2014
SDO 020
5/16/2014
SDO 023
Red -Brown
No
2
2
1
No
No
No
No
5/16/2014
SDO 024
Red -Brown
No
4
1
1
No
No
No
No
6.01
8.90
3.301
5/16/2014
SDO 025
None
No
5
1
2
No
No
7.01
0.114
45
<0.1
0.052
0.078
<5.0
No
No
Piedmont Triad International Airport
NPDES Permit Renewal Application NCS000508
Sheet it of 13
1211012014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Visual and Analvtical Data Summary (continued)
Date Location
5/16/2014 SDO 026
5/16/2014 SDO 027
5/16/2014 SDO 028
5/16/2014 SDO 029
5/16/2014 SDO 030
5/16/2014 SDO 031
5/16/2014 SDO 032
5/16/2014 SDO 033
5/16/2014 SDO 036
5/16/2014 SDO 038
5/16/2014 SDO 040
6/10/2014 SDO 027
9/17/2014 SDO 004
9/17/2014 SDO 007
9/17/2014 SDO 009
9/17/2014 SDO 019
9/17/2014 SDO 020
9/17/2014 SDO 033
9/17/20141 SDO 036
11/24/20141 SDO 001
11/24/2014 SDO 002
11/24/2014 SDO 003
11/24/2014 SDO 004
11/24/2014 SDO 005
11/24/2014 SDO 007
11/24/2014 SDO 008
11/24/2014 SDO 009
11/24/2014 SDO16A
11/24/2014 SDO 019
11/24/2014 SDO 020
11/24/2014 SDO 023
11/24/2014 SDO 024
11/24/2014 SDO 026
11/24/2014 SDO 030
11/24/2014 SDO 031
11/24/2014 SDO 033
11/24/2014 SDO 036
11/24/2014 IS #01
11/24/2014 IS #02
11/24/2014 IS #05
11/24/2014 IS #06
11/24/2014 IS #07
11/24/2014 IS #08
11/24/2014 IS #10
11/24/2014 IS #11
Color odor Clarity FS SS Foam Sheen Eros.Dep. Other
Red -Orange No 5 1 1 No No No Nok6.43
No 4 1 1 No No No No
pH Turb. D.O. BOD TSS NH3 N COD MBAS NO3+NOi-N Total P O&G AT EG PG
3.40 6.66 2.0 0.646 84 <0.1 0.775 0.759 <5.0None
4.28<2 4.0 0.362 29 <0.1 0.669 0.057 <5.0Red-Brown
3
3
1
1
1
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
NoOrange-Brown
No
No
No
24.40
<2
6.0
0.137
40
<0.1
0.644
0.068
<5.0
None
None
None
No
No
NO
No
No
3
4
3
4
4
3
2
2
1
1
No
No
No
6.42
32.08
6.16I
0.138
21
<0.1
0.256
0.116
<5.0
None
No
4
1
1
No
No
No
Red -Brown
No
2
1
2
No
No
No
No
None
No
2
1
1
No
No
No
No
9
None
No
1
1
1
No
2
1
1
2
1
1
1
1
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
6.66
6.55
<2
<6.7
<0.10
7
<0.1
0.790
0.071
<5.0
None
None
None
None
No
No
No
No
1
1
1
1
No
No
No
No
None
No
1
1
1
Yes
No
No
No
6.79
2.91
<2
<5.0
0.221
11
<0.1
0.389
0.050
<5.0
None
No
1
1
1
No
No
No
No
No
No
1 No
No
No
No
No
No
No
I No
No
No
No.
No
No
No
No
No
No
No
No
No
No
No
6.97
14.91
<2
<5.0
<0.10
24
<0.1
0.589
0.083
<5.0
>100%
<10.0
<10:0
None
No
1
1
1
1
1
1
1
1
1
OrangeMN
Orange1
Orange1
None1
None
None
1
1
2
No
No
No
No
None
No
1
2
1
No
No
No
No
No
No
No
No
No
No
No
No
No
7.22
94.70
2.10
60
<0.10
39
<0.1
0.277
0.128
<5.0
>100%
<10.0
<10.0
None
Orange
None
No
No
No
1
2
1
1
1
1
1
1
1
No
No
No
None
No
1
1
1
No
No
No
No
No
No
No
I No
No
No
No
No
No<0.10
No
No
6.86
7.03
3.03
2.68
<2
<2
<5.0
6.60
<0.10
0.102
13
16
5
<O.1
<0.1
<0.1
0.051
1.01
1.26
0.052
0.068
0.067
<5.0
<5.0
<5.0
>100�°
>100%
>100%
<10.0
<10.0
<10.0
<10.0
<10.0
<10.0
None
None
None
No
No
No
1
1
1
1
1
1
1
1
1
None
No
1
1
1
No
No
No
No
No
No
No
7.19
3.81
30.8
5.60
<0.10
53
<0.1
0.632
0.091
<5.0
>100%
<10.0
20.5
None
None
No
No
1
1
1
1
1
1
No
No
No
No
No
No
None
"No Flow"
No
observations
1
not included
1
1
7.03
6.60
11.62
>100%
6.82
14.13
8.93
>100%
7.48
21.57
9.04
>100%
Because the final year analytical monitoring of the existing permit term has not been completed prior to
-filing the renewal submittal, the last years monitoring results will be submitted within 30 days of receipt of
the laboratory reports.
7.29
17.52
10.51
>100%
7.15
9.63
8.27
>100%
7.37
13.04
9.38
>100%
7.20
34.30
8.61
>100%
6.991
33.68
8.80
1
>100%
NCS000508
Piedmont Triad International Airport Sheet 12 of 13 1211012014
NPDES Permit Renewal Application

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Visual and Analytical Data Summary (additional information)
2.1 Visual Data Parameters
Header
Discharge Characteristics
Data Validation
Color
Color
None/[Color]
Odor
Odor
Yes/No
Clarity
Clarity
clear= 1 /
2 / 3
/ 4
/ 5=cloudy
FS
Floating solids
no solids= 1 /
2 / 3
/ 4
/ 5=covered
SS
Suspended solids
no solids= 1 /
2 / 3
/ 4
/ S=muddy
Foam
Foam
Yes/No
Sheen
Oil sheen
Yes/No
Eros.Dep.
Erosion or deposition at the outfall
Yes/No
Other
Other obvious indicators of stormwater pollution
Yes/No
3.1
Header
Discharge Characteristics
Benchmark Units
pH
pH
6-9 standard
Turb.
Turbidity
50 NTU (effective Year 2)
D.O.
Dissolved Oxygen
5 mg/L
BOD
Biochemical Oxygen Demand
30 mg/L
TSS
Total Suspended Solids
100 mg/L
NH3-N
Ammonia -Nitrogen
7.2 mg/L
COD
Chemical Oxygen Demand
120 mg/L
MBAS
Detergents
0.5 mg/L
NO3+NO2-N Nitrate plus Nitrite -Nitrogen
10 mg/L
Total P
Phosphorus, Total
2 mg/L
O&G
TPH/Non-polar Oil & Grease
15 mg/L
AT
Acute Toxicity
<100 %
EG
Ethylene Glycol
14,000 mg/L
PG _
Propylene Glycol
mg/L
Pcpn. Precipitation
(threshold) 0.10 inches
ADF Aircraft Deicing Fluid Application
(threshold) 100 gallons
Aircraft Deicing Fluid
Precipitation
Discharge Monitoring
ADF:Date
(gal.)
Pcpn:Date
(in.)
DM:Date (schedule)
9/27/2010
1.50
9/27/2010
Year 1 - Period 1
12/1/2010
220
11/30/2010
0.75
12/1/2010
Year 1 - Period 2 / Deicing 1
1/12/2011
193
1/11/2011
0.25
1/12/2011
Year 1 - Deicing 2
1/25/2011
170
1/26/2011
0.45
1/26/2011
Year 1 - Deicing 3
3/16/2011
0.22
3/16/2011
Year 1 - Period 3 / Tier Two 1
4/6/2011
130
4/8/2011
0.16
4/9/2011
Year 1 - Deicing 4 / Tier Two 2
5/22/2011
0.39
5/23/2011
Year 1 - Tier Two 3
6/9/2011
0.19
6/10/2011
Year 1 - Period 4
9/21/2011
0.10
9/21/2011
Year 2 - Period 1
11/1/2011
280
11/3/2011
1.94
11/4/2011
Year 2 - Deicing 1
12/6/2011
0.12
12/7/2011
Year 2 - Period 2
12/19/2011
292
12/21/2011
0.12
12/21/2011
Year 2 - Deicing 2
1/20/2012
210
1/20/2012
0.33
1/21/2012
Year 2 - Deicing 3 / Tier Two 1
2/23/2012
1,329
2/23/2012
0.19
2/23/2012
Year 2 - Deicing 4 / Tier Two 2
3/20/2012
0.47
3/21/2012
Year 2 - Period 3 / Tier Two 3
6/6/2012
0.18
6/6/2012
Year 2 - Period 4
9/22/2012
0.16
9/23/2012
Year 3 - Period 1
12/8/2012
0.16
12/8/2012
Year 3 - Period 2
12/14/2012 440
12/16/2012
0.28
12/17/2012
Year 3 - Deicing 1
1/8/2013 215
1/11/2013
0.11
1/11/2013
Year 3 - Deicing 2
1/18/2013 1,754
1/17/2013
3.00
1/18/2013
Year 3 - Deicing 3
1/26/2013 1,060
1/25/2013
0.11
1/26/2013
Year 3 - Deicing 4
2/19/2013
0.22
2/20/2013
Year 3 - Tier Two 1
3/5/2013
0.44
3/6/2013
Year 3 - Period 3
3/20/2013
trace
3/22/2013
Year 3 - Tier Two 2
4/23/2013
0.02
4/23/2013
Year 3 - Tier Two 3
6/2/2013
0.68
6/3/2013
Year 3 - Period 4
9/21/2013
0.71
9/22/2013
Year 4 - Period 1
11/26/2013 260
11/26/2013
0.43
11/26/2013
Year 4 - Period 2 / Deicing 1
12/28/2013 328
12/29/2013
0.75
12/29/2013
Year 4 - Deicing 2 / Tier Two 1
1/21/2014 275
1/21/2014
0.17
1/22/2014
Year 4 - Period 3 / Deicing 3 / Tier Two 2
3/3/2014 2,319
3/3/2014
0.42
3/4/2014
Year 4 - Deicing 4 / Tier Two 3
3/29/2014
0.14
3/29/2014
Year 4 - Tier Two 4
4/29/2014
0.18
4/30/2014
Year 4 - Tier Two 5
5/15/2014
1.60
5/16/2014
Year 4 - Period 4 / Tier Two 6
6/9/2014
0.26
6/10/2014
Year 4 - Tier Two 7
9/16/2014
0.43
9/17/2014
Year 5 - Period 1
11/22/2014 415
11/23/2014
0.74
11/24/2014
Year 5 - Period 2 / Deicing 1
Because the final year analytical
pen
al.
ADF application
Year 5 - Deicing 2
monitoring of the existing permit
pending
>100 gal.
ADF a
Year 5 - Deicing 3
term has not been completed prior
to filing the renewal submittal, the
pending
>100 gal.
ADF application
Year 5 - ei '
last years monitoring results will be
due
3/31/2015
Year 5 - Period 3 .
submitted within 30 days of receipt
due
6/30/2015
Year 5 -Period 4
Piedmont Triad International Airport NCS000508
NPOES Permit Renewal Application Page 13 of 13 1211012014

R
Taylor -Smith, Aana
From: Hollenkamp, Carol
Sent: Tuesday, April 22, 2014 12:01 PM
To: Pickle, Ken
Cc: Georgoulias, Bethany, Bennett, Bradley; Taylor -Smith, Aana; Moore, Cindy
Subject: RE: permit for Piedmont Triad Airport?
That all sounds excellent to me. Thanks Ken for working out the logistics, and thanks Aana for explaining the role of
WSRO. I have not been sending the tox results to Central Files. I've just been keeping them here with the toxicity
files. As mentioned, there are not that many of them so sending them and storing them at SPP shouldn't be an issue. I
will send the results I have so far next week (I will be out of the office the rest of this week). I will also keep copies here
so there will be alternate sources of documentation in the toxicity files at 4401 Reedy Creek Road.
Thanks Everyone!
Carol Hollenkamp
Aquatic Toxicology Branch/Water Sciences Section
North Carolina Division of Water Resources/DENR
1621 Mail Service Center, Raleigh, NC 27699-1621
Phone: [phone]
Fax: [phone]
Website: http://portal.ncdenr.org/web/wq/ess/atu
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.
From: Pickle, Ken
Sent: Tuesday, April 22, 2014 11:23 AM
To: Hollenkamp, Carol
Cc: Georgoulias, Bethany; Bennett, Bradley; Taylor -Smith, Aana
Subject: RE: permit for Piedmont Triad Airport?
Hi Carol, thanks for helping us with these test results. See what you think about this arrangement between us:
Administrative proposal for your consideration:
• Please continue to receive and evaluate the tox results for PTIA.
• Please don't send to DWR Central Files. (Don't know if you were doing that, but please don't anymore.)
• Instead, please send original paper submittal to SPP-DEMLR. KBP to file in my office with all the other PTIA
documentation for the last 15 years.
• Carol to provide email assessment/interpretation of results to ATS in WSRO-DEMLR, copy to KBP in SPP. KBP
to print email and file with companion test results, and other PTIA documentation.
• Carol to make copies/keep copies as necessary to satisfy her program needs. Please let us know if you intend to
keep duplicates so that we are aware of any alternate source of documentation.
As for WSRO-DEMLR and Aana
• ATS indicates she's content with receiving Annual Summaries only, as generated successfully (mostly) by the
permittee so far.

As noted above, Carol to send email interpretation/assessment of the tox tests to ATS. ATS to print &file as
she thinks best for WSRO needs, along with the Annual Summaries from the permittee and other PTIA
documentation in WSRO files.
Carol, does this work for you?
Aono, does this work for you?
Let me know if you see a way that suits your needs better.
Thanks,
Ken
Ken Pickle
Environmental Engineer
NCDENR I DEMLR I Stormwater Permitting Program
1612 Mail Service Center, Raleigh, NC 27699-1612
512 N. Salisbury St, Raleigh, NC 27604
Phone: [phone]
Fax: [phone]
Email: ken. pickle(ancdenr.gov
Website: http://portal.ncdenr.org/web/Ir/stormwater
** Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be
disclosed to third parties unless the content is exempt by statute or other regulations.**
From: Georgoulias, Bethany
Sent: Tuesday, April 22, 2014 8:50 AM
To: Bennett, Bradley; Pickle, Ken
Subject: RE: permit for Piedmont Triad Airport?
I agree.
Bethany Georgoidias, EnvironmenlalEngineer
NCDENR / Division of Energy, Mineral, and Land Resources
Stormwater Permitting Program
1612 Mail Service Center, Raleigh, NC 27699-1612
512 N. Salisbury Street, Raleigh, NC 27604
919 / 807-6372 (phone); 919 / 807-6494 (fax)
Website: http://portal.ncdenr.org/web/Ir/stormwater
E-mail correspondence to and from this address may be .subject to the North Carolina Public Records low and may be disclosed io third parties.
From: Bennett, Bradley
Sent: Tuesday, April 22, 2014 8:20 AM
To: Pickle, Ken; Georgoulias, Bethany
Subject: RE: permit for Piedmont Triad Airport?
Ken, Bethany

r
Just a thought on our approach here. I think maybe we should have the lab send information on the results to us and to
the regional office. We can file the results in our files here so we don't have to go to central files or archives for the data
in the future. We won't have too many of these where there are tax reports going to the lab.
32
Bradley Bennett
Stormwater Permitting Program Phone: [phone]
NC Division of Energy, Mineral and Land Resources Fax: [phone]
1612 Mail Service Center Email: bradley.ben netta(v)ncdenr.gov
Raleigh, NC 27699-1612 Web: http://portal.ncdenr.org/web/Ir/stormwater
Email correspondence to and from this address may be subject to public records laws
From: Pickle, Ken
Sent: Friday, April 18, 2014 11:35 AM
To: Hollenkamp, Carol
Cc: Bennett, Bradley; Georgoulias, Bethany; Taylor -Smith, Aana
Subject: RE: permit for Piedmont Triad Airport?
Hi Carol,
Thanks, Bethany, for sending the permit to Carol.
Additional comments requested from: Aano, Bethany, Bradley
Carol, for the current version of the PTIA permit I may be the person with the most background still remaining in the
Central Office Stormwater Permitting group. The permit requires the permittee to provide WSRO with an annual
summary of the monitoring results, which I would say should include the tax results, too. So, I hope that WSRO is
receiving the tax results on an annual basis from PTIA. Carol, are you eventually sending the tax results into DWR
Central Files, or are you accumulating them at your location?
As to possible additional sharing of the tax test results:
a) You could continue to keep them on site at your location, and report the results to us via email like you did for
the current results.
b) And/or you could subsequently forward them to us, and we could file them in our permit files after your
review. It seems to me there may be a perspective that we in the Stormwater Permitting Program should have
primary responsibility for keeping the test results obtained under our permit.
c) We (you or Stormwater) could send them to DWR Central Files. Although there are procedures in place for
retrieving archived DMRs and other files, I don't like sending important stuff to Central Files when we know for
certain that we will need to have access to it. Currently Central Files is archiving our program files off -site on a
two year basis. I would rather that we have more immediate access to our own materials than that.
I'd like to have comments from others on distribution as to what would make sense wrt Carol sharing the tax test
results, and as to the ultimate disposition of the incoming materials and her review of them. I'm not sure what makes
the most sense with these results for Carol's program and for our program.
Carol, if you're interested, here's the programmatic rationale for our needs wrt to the tax testing results.
Background information on what we will do with the PTIA tax test results, and why:
Our permittees are supposed to be reviewing all analytical results and reacting to them. Our programmatic
need is to have the permittees submit.the paper results as evidence that they did the tax testing, as required
by the permit. This amounts to a partial and low level effort to police their compliance with the conditions of

the permit. We don't generally attempt real-time tracking of whether or not they are either submitting or
reacting to the results, except upon the infrequent occasion of a stormwater inspection by the Regional Office.
• Our Stormwater Permitting group has to renew that permit every 5 years. The tax data would be important in
that renewal. Our need: to review the testing results over the previous permit cycle when the permit comes
up for renewal.
• To some degree, we want to provide the ability for all the Regional Offices to plan their stormwater inspection
agenda for the coming year based on which permittees seem to be having trouble, presuming that any particular
Region would find that ability useful in their planning process. So, accordingly the Winston-Salem Regional
Office might need to see the data periodically, especially if it is non -compliant. Presumably this need is being
met to some degree by PTIA's annual submittal to WSRO.
• And following as a result of the previous bullet, at some unspecified frequency the Regional Office is charged
with inspecting our permittees for compliance with the permit conditions. Sometimes individuals in the
Regional Offices like to review testing data before visiting a permittee's site. We have made a monitoring
results database accessible to the Regions, but I don't think we are enabled to key in the tax test results. So
potentially WSRO can't access the most recent tax data, if it was generated before the annual summary was
submitted. So perhaps to some degree WSRO may need to have ready access to the most recent tax results in
advance of an inspection. But still, presumably the required annual monitoring summary partially meets this
need of WSRO. I've copied Aana in WSRO (DEMLR) for her comments/corrections on my two bullets here
describing what more, if anything, WSRO might need wrt the tax results at PTIA.
Anna, Bethany, and Bradley: Can you all help Carol and me work through the questions of the best approach for ultimate
disposition and of how, with who, and when to share the tax testing data, please? If we already have reliable
procedures in place, and I'm just not up to speed, please let me know that. If you have workable ideas related to how we
address the needs I've identified, please comment. Thanks,
ken
Ken Pickle
Environmental Engineer
NCDENR I DEMLR I Stormwater Permitting Program
1612 Mail Service Center, Raleigh, NC 27699-1612
512 N. Salisbury St, Raleigh, NC 27604
Phone: [phone]
Fax: [phone]
Email: ken. oickle(c)ncdenr.aov
Website: http://portal.ncdenr.org/web/Ir/stormwater
** Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be
disclosed to third parties unless the content is exempt by statute or other regulations.**
From: Hollenkamp, Carol
Sent: Thursday, April 17, 2014 12:52 PM
To: Georgoulias, Bethany
Cc: Pickle, Ken
Subject: RE: permit for Piedmont Triad Airport?
Thanks Bethany. Yes, that is the one.
Should I be sharing the toxicity results with anyone? We received a batch of results on 4/2/14, with a test date of
3/12/14. All toxicity results were >100%, except for Pipe OF-026, which had a value of LC50=70%. So, this would be
considered exceeding their benchmark for acute toxicity after a de-icing event.
Thanks,

Carol
Carol Hollenkamp
Aquatic Toxicology Branch/Water Sciences Section
North Carolina Division of Water Resources/DENR
1621 Mail Service Center, Raleigh, NC 27699-1621
Phone: [phone]
Fax: [phone]
Website: http://portal.ncdenr.org/web/wq/ess/atu
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.
From: Georgoulias, Bethany
Sent: Thursday, April 17, 2014 12:39 PM
To: Hollenkamp, Carol
Cc: Pickle, Ken
Subject: RE: permit for Piedmont Triad Airport?
Hi Carol,
I pulled this one off our shared drive. I think this is the one you need.
Bethany
Belh(m), Georgouias, Environmented Engineer
NCDENR / Division of Energy, Mineral, and Land Resources
Storrnwater Permitting Program
1612 Mail Service Center, Raleigh, NC 27699-1612
512 N. Salisbury Street, Raleigh, NC 27604
919 / 807-6372 (phone); 919 / 807-6494 (lax)
Website: http://portal.iicdenr.ora/web/Ir/stormNvater
E-mail correspondence to andfrom this address may be subject to the North Carolina Public Records Ica,, and nay be disclosed to otord parses.
From: Hollenkamp, Carol
Sent: Thursday, April 17, 2014 12:36 PM
To: Georgoulias, Bethany
Subject: permit for Piedmont Triad Airport?
Hi Bethany,
Would you be able to send me a copy of the permit for Piedmont Triad Airport (NCS000508)? Or who I should ask to get
a copy? We receive periodic toxicity tests for them (after deicing events), but I only have a permit fact sheet for them,
not the actual permit.
Thanks,
Carol Hollenkamp

Aquatic Toxicology Branch/Water Sciences Section
North Carolina Division of Water Resources/DENR
1621 Mail Service Center, Raleigh, NC 27699-1621
Phone: [phone]
Fax: [phone]
Website: http://portal.ncdenr.org/web/wq/ess/atu
E-mail correspondence to and from this address maybe subject to the North Carolina Public Records Law and may be
disclosed to third parties.

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Taylor -Smith, Aana
From:
Gantt, Matt
Sent:
Thursday, August 08, 2013 8:52 AM
To:
Taylor -Smith, Aana; White, Sue
Subject:
FW: GSO Northwest Taxiway
Matthew E. Gantt, P.E.
NC DENR Winston-Salem Regional Office
Division of Energy, Mineral, and Land Resources
585 Waughtown Street
Winston-Salem, NC 27107
Voice: [phone]
FAX: [phone]
E-mail correspondence to and from this address may be subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Grogan, Patrick
Sent: Wednesday, August 07, 2013 11:24 AM
To: Williams, Andrew E SAW; Homewood, Sue; Euliss, Amy; Rochelle, Rodger D; Travis, Jimmy L; Brooks, Lonnie I
Cc: Vinson, Toby; Davis, Tracy; Leonard, Shannon; Gantt, Matt; Hardison, Lyn; Harwood, Joseph E; Bush, Ted
Subject: GSO Northwest Taxiway
Good Morning Everyone,
Just received an email from the URS Corp. engineer with the meeting room and directions.
For the site visit at Piedmont Triad Airport scheduled for Monday August 12, we will be meeting in the Upper Level
Board Room of the Aviation Authority offices. The Aviation Authority offices are on the top floor of the terminal
building. When entering the Airport, park on the upper level of the parking garage/platform. Use the outer row which is
for visitor parking. If you provide the Authority receptionist with your vehicle registration, license number and parking
space number you will not have to pay for the parking.
When you arrive at the Aviation offices, ask for Alex Rosser, Director of Planning and Engineering. We will meet at
10:00. Following introductions, Paul Behrens, URS Corp., will provide a brief overview of the Proposed Project and site
layout to help orient the group before we head out to the field. I anticipate an hour to perhaps an hour and a half for
the actual field visit but we have no time constraints, if more time is needed. The Airport will provide a van for touring
the site.
I'm looking forward to seeing everyone next Monday and hopefully the weather will be good for the site visit. Please let
me know if you have any other questions or if I can help with anything else.
Patrick Grogan - [e-mail]

Homewood, Sue
From:
Homewood, Sue
Sent:
Thursday, June 14, 2012 2:18 PM
To:
Pickle, Ken
Cc:
Mickey, Mike
Subject:
RE: PTIA relocated sampling points
Hi Ken,
I received that letter back in April and just put it aside to wait to hear from you and forgot all about it. I saw Richard the
other day and asked him about it and he said they were waiting on you so I thought that was odd. I'm glad Richard
figured out why he hadn't heard from you.
Thanks for checking with me. I am onboard with all the requested changes. Since we haven't been doing much
compliance other than making sure sampling reports come in, it doesn't surprise me that we all missed the ball on this
one. Better late than never I guess.
Mike, I'll put all these documents in your inbox for the NPDES permit file, maybe later this year we can go out there
together.
Sue Homewood
NC DENR Winston-Salem Regional Office
Division of Water Quality
585 Waughtown Street
Winston-Salem. NC 27107
Voice: [phone]
FAX: [phone]
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.
From: Pickle, Ken
Sent: Thursday, June 14, 2012 1:33 PM
To: Homewood, Sue
Cc: Bennett, Bradley
Subject: PTIA relocated sampling points
Hi Sue,
OK, we've had a minor delay in communications with PTAA about their second round of relocated outfalls. It seems that
PTAA drafted a letter April 18, 2012, but didn't mail it to us until recently. Our in -date stamp shows we received it June
11, 2012. The letter dated 4/18/12 shows you as on distribution. Just curious — did you receive your copy in April, or in
June?
Anyway, Richard Darling of Baker called me and apologized for the oversight in his office (or at PTAA?) and talked me
through the changes in general. Hard to believe that we are well into the second term of the permit before finding out
that they have been sampling up inside the facility, rather than at the outfalls, but there it is. This revision to sampling

points converts 23 previous sample locations into 11 new sample locations, based mostly on their previous erroneous
practice of sampling multiple inlets into stormwater ponds, instead of the pond outlets. Hmmmmm.
I'm getting ready to send Mickie Elmore a confirming email that OKs the changes to the sampling points, but I wanted to
double check with you. I think you were instrumental in pointing out to them the bad sampling locations previously, and
I presume you do not need to visit the site again, or for me to hold up on an informal approval of their proposed changes
to sampling locations. But, let me know that you have received this note, please.
Thanks,
Ken
Ken Pickle
Environmental Engineer
NCDENR I DWQ I Stormwater Permitting Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
512 N. Salisbury St, Raleigh, NC 27604
Phone: [phone]
Fax: [phone]
Email: ken. oickle@)ncdenr aov
Website: http:Z/I)ortal.ncdenr.orqlwebZwq/ws/su
** Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be
disclosed to third parties unless the content is exempt by statute or other regulations.**

1 -Z-�A PTI
PIEDMONT TRIAD AIRPORT AUTHORITY
April 18, 2012
North Carolina Departinent of Envirofmientand
NaturalResources;; Division of Water'Quality;
Slornnater Permitting.Unit
1617 iviail Service Center
Raleigh, NC ' 27699-1617
Attention: Mr: Ken Pickle, Stormwatei-'Eiigj eer
Subject:. NPDES Individual Permit NCS000508
Piedmont Triad•IiiterhatimialA'ii p6d.
Dear Mr. Pickle
Thank you for your e-iiiail re'spais.e of March,22;.2012 to my'pievio is 1'ette_r and:yourdi.kussion
with Richard Darling on March 28, 2012.: Based oil this: response and additional revim-of'the
current field sampling' locations for'the Storniwater Discharge Outfalls.(SDOs); the Piediiiont
Triad Airp6rt. Authority, and NPDES' NCS000508 co-peri iittees propose some logical
adjustinents. Apparently -some of the locations,'and niiinberiiig,,of storinwater numiagentent
features presented in the '2010. NPDES permit renewal werebased' on inlet pipes• to.
retention/detention ponds.and/or sediment traps. The.applicablo qualitative SDO,sainpling,
locations (Map l)"would seen to more 'appropriately be: designated at' the„outfalls •to these
features. The following adjusifitents to the qualitative.sainpling,locatiori§-are lroposed;
u Location 32 has been sampled at the Fetlr.� No i Pond-lblet' pike;, it is' proposed to be
felocated'to the FedEx No. I Pond outfall':as S1.j0 0.32,(Map.2).,
o Location 34 has.been,sampled at.the second of.the:two Fe.dEx.N6..2 Pond iiil'ets; it will
be eliminated because SDO,033 has lieeir sampled at the FedEk- No, 2 PoaO outfall
(Map 3).
o Similarly, locations.35 and 37 will be eliminatO.because SDO�036 is sampled .at the,
FedH,No:'3 Pond ouifall (Map 4):
b Similarly; location 39 will be eliminated_ .bCCauseSDO 038 is.sampled at the_Wonda:No.• 1
Pond outfall (Map 5);.
u Locations'63, 64, and 65 will be. eliminated because SDO 028 is sanioled: at the pond.
outfall to wliicli ihese pipes inlet.(Map 6).
o 'Locutions 66 acid 67 will be eliminated because SDO 029Is, "san_ipled'd the pondoutfall
to which these -pipes ,inlet (Map 7).
I000.A:Ted .lohnson'Parkway, Greensboro,'NC 2.7409, 336-665-5660

,April 18; 2012
Mr. Kbri-Tickle
page oft.
The'following _acljustnienis are also proposed basecl:mi furth& field investigation:
a SDO 003 is:Oroposed ,to be.r%locatcd downstrcani as'it is incorpoiate<I into the Honda
facility expansion site. 'When the new oritfall is completed; anticipated Septeplbei 2012;
the sampling.poiiit Will be•relocated;here (Map!8).
o Erosion and cliaiuiel,stability-issues liave•reccntly been identified at SDO 16A. Proposed
repair and stabilization will beadded•to the Iistpf previously identifiedI re}iairs (Mal) 9)..
u SDOMI and SDO 022 wcie reconfigured during construction.of the anew runway and
this, drainage is cui rcfidy chaintcled, to SDO 02.0 and, SDO 023 respectively- -SDO 021
and. SDO022 no longer exist and are: proposed to'be; eliminated from the sampling
progiani (Map 1'0; Map 11)
Consistent_with the ratiogale of;sampling,gf finaklischarge,points rather -than at locations within
the storiiiwater>niaiiageuient system, leading fo,the adjuslnrents proposed above; the'lisl of SDO
locations'proposed to be added to the NPDES monitoring program pending.applicable future, site
development will be based.6n the4etual.locatio6 of the outfalls, not inlets to. retention/detention
-ponds. or sediment traps; 'I'lie originally proposed twenty-three locations numbered•41 tfirough
61mill acivally correspond'to eleven SDOs. These are propose d'to be numbered Oat tluough
051 consecutively. The naps depictitig the numbereil,SDO locations [Figures l and 2, in the
2011 PTIA Stormwater Pollution Prevention Plan (SPPP) update] will be revised -accord ingly in
the 201.2 SPPP update along wither summary of the idjiistmerts and rationale.
We look forward to working togetherr to ensure continued,permit and regulatory compliance at
Piedmont Triad International' Airport. Pleaie feel fi•cc to contact me,. of Richard Darling at
919,=481-57.40.witli anyquestions.or comments.
Siiicerely;
Y
R B D/JAR/LJ A/M LE: rbd.
Enclosures: 2010 Aerial Photographs oRProposed Adjustments to Qualitative Sampling
16catioiis•(1 1 pages)
cc; Sue Homcwoo&DWQ-WSRO
IZichard.Darling; BAKER

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Map 4. Sampling Locations 35 and 37 (Inlets) to be Eliminated due to SDO036
sampled at FedEx Pond 3 Outfall
Piedmont Triad International Airport March 28,2012
Stormwoter Pollution Prevention Plan Sheet 4 of 11 Revised SDO Monitoring Locations

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at Honda Pond 1 Outfall
Piedmont Triad International Airport March 28, 2012
Stormwater Pollution Prevention Plan Sheet 5 of 11 Revised SOO Monitoring Locations

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sampled at Pond Outfall
Piedmont Triad International Airport March 28, 2012
Stormwater Pollution Prevention Plan Sheet 7 of 11 Revised SDO Monitoring Locations

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Map 10. SDO021 No Longer Exists (Flow Re -Routed to SDO020) Sampling
Location Eliminated
Piedmont Triad International Airport March. 28, 2012
Stormwater Pollution Prevention Plan Sheet 10 of 11 Revised SDO Monitoring Locations

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North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Charles Wakild, P. E. Dee Freeman
Governor Director Secretary
March 26, 2012 RECEIVED
N.C.Dept. of ENR
Mickie L. Elmore MAR 2'9'2012
Director of Development wlnston-smen,
Piedmont Triad Airport Authority Re tonalcrce
POBox 35445
Greensboro, North Carolina 27425
Subject: NPDES permit NCS000508
Piedmont Triad International Airport
Turbidity and erosion responses
Dear Mr. Elmore:
Thank you for your letter of March 15. As you requested, I'm providing the
following clarifications of your stormwater discharge permit.
• We concur that the four representative sampling locations should be
adjusted, whether by a few feet of a few hundred feet, to capture the
intended runoff from the areas of industrial activity. Sue Homewood has
already assisted you in the determination of the revised locations that will
better capture representative samples of the runoff.
• As you suggest, I think the best approach to minimize future confusion over
the analytical results previously obtained would be to name the new adjusted
locations as follows: SDO 006A, SDO 024A, SDO 026A, and SDO 027A.
Presumably PTAA can begin reporting analytical results using the new
notations for any samples obtained on or after February 17, 2012.
• We do not need to amend the text of the permit. DWQ will address the
changes with a copy of this letter in the file, and we will amend the permit
text at the next scheduled renewal of the permit.
• We concur with the responses to the erosion features illustrated in the
descriptive materials attached to your letter.
1617 Mail Service Center, Raleigh, North Carolina 27699.1617
Location: 512 N. Salisbury St, Raleigh, North Carolina 27604
Phone: [phone] FAX [phone]
Internet: w .ncwaterouahty.or0
None
rthCarohna
Naturaltlf
An Equal Opportunity 1 Affirmative Action Employer

Mr. Mickie L. Elmore
March 26, 2012
Page 2 of 2
• We are amenable to subsequent discussions on the best way to consider
sediment pollution as measured by turbidity. If revisions to the monitoring
scheme are indicated, we can make those adiustments without waiting for
the next expiration date of the permit.
• Please note that the permit text requires that you record every instance of a
Tier 1 or Tier 2 remedial response in the Stormwater Pollution Prevention
Plan. The permit text identifies the short list of elements required for that
record.
Please contact me with any questions or comments.
Sincerely,
Ken Pickle
DWQ Stormwater Permitting Unit
[phone]
cc: Richard Darling, Baker
Sue Homewood, DWQ-WSRO

Mickey, Mike
From: Basinger, Corey
Sent: Monday, March 04, 2013 9:05 AM
To: Mickey, Mike
Subject: FW: NPDES Individual Permit NCS000508; Piedmont Triad International Airport
Attachments: image003Jpg; 2013.03.01—DEN R_Tierll-1.pdf
FYI.
Please review and let's discuss sometime this week.
Thanks.
CB
W. Corey Basinger
Regional Supervisor
Surface Water Protection Section
Winston-Salem Regional Office
Division of Water Quality
Email: [e-mail]
Phone: [phone]
Fax [phone]
P E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to
third parties.
From: Pickle, Ken
Sent: Monday, March 04, 2013 8:51 AM
To: Bennett, Bradley; Patterson, Robert; Randall, Mike
Cc: Basinger, Corey
Subject: FW: NPDES Individual Permit NCS000508; Piedmont Triad International Airport
FYI, No Action
(For folks interested in airports)
Dewdrops,
The attached letter to Corey notifies WSRO that our stormwater permittee, Piedmont Triad Airport NCS000508, has
exceeded BOD and COD benchmarks four times at one outfall. Consultant reports a 'massive de-icing event', and
related to me verbally that he suspects that residuals from that event continue to contribute to the high results.
(Although,/ notice that two of the four results appear to have taken place before the apparent week of the de-icing
event. Not sure what to make of the consultants interpretation given that sequence?/ wonder at what point we would
consider treating this as a 'spill' rather than a stormwoter benchmark exceedonce, and if that would make any
difference? Discharge BOD of 16,900 mg/L?? Discharge COD of 28,600 mg/L??)
WSRO is in the lead on this exchange with our permittee.
kbp

Ken Pickle
Environmental Engineer
NCDENR I DWQ I Stormwater Permitting Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
512 N. Salisbury St, Raleigh, NC 27604
Phone: [phone]
Fax: [phone]
Email: ken. oickle(&ncdenr.00v
Website: htto://i)ortal.ncdenr.org/web/wo/ws/su
** Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be
disclosed to third parties unless the content is exempt by statute or other regulations.**
From: Darling, Richard[maiIto: RDarling(abmbakercorp.com]
Sent: Friday, March 01, 2013 3:39 PM
To: corey.basinger(cbncdenr.00c
Cc: Pickle, Ken; Homewood, Sue; Alex Rosser
Subject: NPDES Individual Permit NCS000508; Piedmont Triad International Airport
Mr. Basinger:
Attached is written notification of four benchmark exceedances (BOD & COD at SDO 027).at PTIA in compliance with Tier
Two monitoring requirements of NCS000508. Please contact me or Alex Rosser at your convenience to discuss. Thanks
for your attention.
Richard
Richard B. Darling I Environmental Manager I Michael Baker Engineering
8000 Regency Pkwy., Suite 600 1 Cary, NC 27518 1 919.463.5488 (office) 1 919.481.5740 (direct)
rdarlina(a)mbakercoro.com I www,mbakercorp.com

PIEDMONT TRIAD AIRPORT AUTHORITY
March 1, 2013
North Carolina Department of Environment and
Natural Resources; Division of Water Quality
545 Waughtown St.
Winston-Salem, NC 27107-2241
Attention: Mr. Corey Basinger, Surface Water Protection Supervisor
Subject: NPDES Individual Permit NCS000508
Piedmont Triad International Airport
Dear Mr. Basinger:
RECEIVED
N.C. Dept. of ENR
MAR 0 4 2013
wiristcq-salem
Regior.:.i ouice
In compliance with the subject National Pollutant Discharge Elimination System (NPDES)
individual stonnwater permit issued for the Piedmont Triad International Airport (PTIA), "Tier
Two" monthly water quality monitoring has been conducted at stormwater discharge outfall
(SDO) locations and at in -stream (IS) locations due to compliance monitoring results above
benchmark values. NPDES Permit NCS000508 specifies that:
"During the term of this permit, if the valid sampling results required for the
permit monitoring periods exceed the benchmark value, or are outside the
benchmark range, for any specific parameter at any specific outfall or in -stream
location on four occasions, the permittee shall notify the DWQ Regional Office
Supervisor in writing within 30 days of receipt of the fourth analytical results."
On February 27, 2013, PTAA was notified that biochemical oxygen demand (BOD) and
chemical oxygen demand (COD) results exceeded benchmark values at SDO 027 for the fourth
consecutive occasion, as follows:
Date
BOD (benchmark 30 mg/L)
COD (benchmark 120 mg/L)
1/11/2013
188
mg/L
337
mg/L
1/18/2013
320
mg(L
537
mg/L
1/26/2013
16,900
mg/L
28,600
mg/L
2/20/2013
153
mg/L
226
mg/L
NPDES Permit NCS000508 further specifies that:
"The permittee will then consult with DWQ about feasible, practical, and cost-
effective measures that the permittee could undertake to reduce the difference
between the sampling results and the benchmark value and to avoid causing or

Mr. Corey Basinger
March 1, 2013
Page 2 of 2
contributing to any violation of water quality standards. After consultation with
the permitlee, DWQ may require that the permittee revise, increase, or decrease
the monitoring frequency for the remainder of the permit and may impose such
other requirements, if any, as may be necessary to prevent the permittee s
discharge from causing or contributing to any violation of water quality
standards, including but not limited to.
• require the permittee to install structural controls; or
• require the permitlee to implement other stormwater control measures.
If the inspection and evaluation of a particular sampling result under Tier One or
Tier Two show that the result is not caused by the perrnitiee'.s operations or
facilities, it will not be treated as a benchmark exceedance for purposes of
determining whether, four consecutive exceedances have occurred."
We look forward to working together to ensure continued permit and regulatory compliance at
Piedmont Triad International Airport. Please contact Richard Darling (919.481.5740) or me
(336.665.5600) at your earliest convenience to discuss.
Sincerely,
PIEDMONT TRIAD AIRPORT AUTHORITY
Im
J. Alex Rosser, P.E.
Director of Planning and Engineering
RBD/JAR:rbd
cc: Sue Homewood; DWQ-WSRO
Ken Pickle; DWQ-Archdale
Richard Darling; Michael Baker Engineering, Inc. — Cary, NC

im
C 7Eo1:T ,IInIIc"Lr�l
LLP
NCDENR — Winston-Salem Regional Office
Division of Water Quality
585 Waughtown Street
Winston-Salem, North Carolina 27107
Subject: Annual Summary Data Monitoring Report
NPDES Permit No. NCS000508
Piedmont Triad Airport Authority
Greensboro, North Carolina
ECS Project 09-16399D
To Whom It May Concern:
i the Standard for Service"
RECEIVED
N.C. Dept. of ENR
FEB 2 S 2013
Winston-Salem
Regional Office
NC Registered Engineering Firm F-1078
February 27, 2013
ECS has completed the Year 3 - Monitoring Requirements (except for the Period 3 and 4
Quarterly Monitoring Events to take place before March 30, 2013 and June 30, 2013,
respectively) in compliance with NPDES Permit No. NCS000508. To date, Year 3 has included
four episodic events (dated January 25, 2013, February 13, 2013, February 18, 2013, and
February 25, 2013) and two quarterly events (October 30, 2012 and January 16, 2013). Copies
of the monitoring reports are included as attachments. Monitoring reports for Year 2 (Episodic
Event -March 19, 2012, Period 3 Quarterly Event -May 3, 2012 and Period 4 Quarterly Event -July
18, 2012) that were not included in the Year 2 annual summary are also included as
attachments.
Please feel free to contact me at [phone] if you have any questions or if additional
information is required.
Sincerely,
ECS Carolinas, LLP
Bra4 dley S. LKckey
Environmental Staff Project Manager
Attachments: January 25, 2013 Episodic Event Report
February 13, 2013 Episodic Event Report
February 18, 2013 Episodic Event Report
February 25, 2013 Episodic Event Report
October 30, 2012 Quarterly Event Report
January 16, 2012 Quarterly Event Report
March 19, 2012 Episodic Event Report
May 3, 2012 Quarterly Event Report
July 18, 2012 Quarterly Event Report
4811 Koger Blvd., Greensboro, NC 27407 • [phone] • Fax [phone] • www.ecslimited.com
Ashaville, NC.Charlorre, NC.Cmosboro, NCeGreenville, SC•Raleigh. NC.Swaroboro, NC • Wilmington, NC

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
4. Best Management Practices
Analysis of Best Management Practices (BMPs) for Piedmont Triad Airport Authority (PTAA) and NPDES
Co-Permittee operations is conducted annually in order to minimize the risk of stormwater pollution at
the Airport. The structural BMPs listed in the North Carolina Department of Environment and Natural
Resources (NCDENR) BMP Toolbox for Public Airports and the procedural BMPs listed in the United
States Environmental Protection Agency (EPA) Industrial Stormwater Fact Sheet Series "Sector S: Vehicle
Maintenance Areas, Equipment Cleaning Areas, or Deicing Areas Located at Air Transportation Facilities"
are being considered in whole or in part for current operations and future development. Pertinent
aspects of applicable regulations including Jordan Water Supply Nutrient Strategy rules, Randleman Lake
Water Supply Watershed rules, and the PTAA Water Supply Watershed Management and Protection
Rules require application of appropriate stormwater BMPs. In addition, major aspects of PTAA's current
development program are subject to the conditions of issued Section 401 (of the Federal Clean Water
Act) Water Quality Certifications from the NCDENR Division of Water Resources (DWR), which specify
BMPs for stormwater discharge. The need for additional BMPs will be based on the assessment of
potential sources to contribute significant quantities of pollutants to stormwater discharges and the
data collected through the stormwater monitoring programs. The status of structural BMPs potentially
applicable to existing and future development at PTIA are summarized in Table 4.1.
Each PTIA co-permittee is requested to complete the SPPP Annual Compliance and Exposure Reduction
Feasibility Survey by January 31st every year. This survey requires review of the technical and economic
feasibility of changing method(s) of operation(s) and/or storage practices to eliminate or reduce
exposure of materials and processes to stormwater. Procedural BMPs in place and/or for potential
consideration at PTIA are listed by pollutant source in Table 4.2
Table 4.1 Airport Structural BMPs
Airport BMP
PTIA Status
Sheet flow, Level Spreaders, and Vegetative Filter Strip
Constructed and in use at PTIA
Grassed Swale
Constructed and in use at PTIA
Bioretention
Not currently in use at PTIA
Infiltration Devices (Infiltration Basin and/or Trench)
Soil types and earthwork compaction
requirements have precluded this practice
at PTIA to -date.
Sand Filter
Constructed and in use at PTIA
Water Harvesting and Cisterns
Not currently in use at PTIA
Extended Dry Detention
Constructed and in use at PTIA
Permeable Pavement
Airfield pavement design requirements
preclude application at PTIA aircraft
movement areas
Proprietary Systems and Innovative Technologies
Currently in use at PTIA Taxiway E
Piedmont Triad International Airport NCS000508
NPDES Permit Renewal Application Page 1 of 5 1012912014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Best Management Practices (continued)
Table 4.2 Procedural BMPs for Potential Pollutant Sources at Air Transportation Facilities
Pollutant Source
Airport BMP
PTIA Status
Deicing/anti-icing
Establish a centralized aircraft deicing station with containment of surface and subsurface drainage.
Impractical due to space constraints and costs to construct
To reduce deicing fluid applied:- Forced -air deicing systems
aircraft
To reduce deicing fluid applied:- Computer -controlled fixed -gantry systems
Impractical due to space constraints and costs to construct
To reduce deicing fluid applied:- Infrared technology
To reduce deicing fluid applied:- Hot water
To reduce deicing fluid applied:- Varying 1 col content to air temperature
To reduce deicing fluid applied:- Enclosed -basket deicing trucks
To reduce deicing fluid applied:- Mechanical methods
To reduce deicing fluid applied:- Solar radiation
To reduce deicing fluid applied:- Hangar storage
Aircraft operations of commercial aircraft preclude storage with deicing necessary to meet airline schedule
requirements
To reduce deicing fluid applied:- Aircraft covers
General aviation may allow for this effort, but covers would need to be provided by the aircraft owners to ensure
covers are adequate for each individual aircraft
To reduce deicing fluid applied:- Thermal blankets for MD-80s and DC-9s
Apply deicing fluid and anti-icer'to planes on deicing pads if available.
Impractical due to space constraints and cost to construct. PTIA is considering designating dedicated locations to
deice aircraft on the existing aprons to minimize exposure
Apply anti-icer to aircraft that will be parked overnight to make it easier to remove accumulated
snow and ice in the morning.
Apply anti-icer to aircraft immediately after deicing to provide extended hold -over time prior to
take -off.
Ensure that stormwater inlets are blocked when deicing/anti-icing during dry weather.
Use mechanical vacuum systems or other devices to collect aircraft deicing runoff from the apron
surface for proper disposal.
Dispose collected aircraft deicing runoff to sanitary sewage facility (if allowed by sewer authority),
on -site treatment or recycle resell or reuse).
Use portable tanks, retention and detention ponds for temporary storage of collected deicing
runoff.
Currently in place at FedEx facility. Commercial and GA aprons would require significant upfit to facilitate this
operation
Collect contaminated runoff in a wet pond for biochemical decomposition (be aware of attracting
wildlife that may rove hazardous to flight operations).
Inconsistent with FAA AC 150/5200-33B due to potential for wet pond to attract wildlife
Recover and recycle/dispose of unused deicing fluids in deicing trucks.
Recover deicing materials when applied during non -precipitation events (e.g., covering storm sewer
inlets, using booms, installing absorptive interceptors in the drains, etc.) to prevent materials from
later contaminating stormwater.
Deicing/anti-icing
Evaluate and optimize present chemical application rates
Use sand where possible to enhance friction.
Using sand or salt as deicers and anti-icers in airports can cause damage to aircraft surfaces and mechanical parts
runways and
Plow and broom runways prior to application of deicing chemicals.
Practice currently implemented
pads
Heat solid deicers and sand prior to application.
Using sand or salt as deicers and anti-icers in airports can cause damage to aircraft surfaces and mechanical parts
Install and calibrate devices to meter the amount of pavement deicer being applied.
Emphasize anti -icing operations which minimize the need to deice.
Install runway ice detections stems ("pavement sensors" to monitor pavement temperatures.
Pre -wet with liquid deicers to improve adhesion of solid deicers to the iced surface.
Use deicers which have less of an environmental impact (e.g. sodium formate and potassium
acetate as opposed to urea and glycol).
Urea application has been discontinued since 2010 and use of non -urea deicers is certified annually
Ensure proper handling and disposal of unused deicing chemicals in vehicles.
Use ice detections stems.
Use airport traffic flow strategies and departure slot allocations stems.
Aircraft, ground
vehicle, and
Eliminate floor drains that are connected to the storm or sanitary sewer; if necessary, install a sump
that is pumped regularly. Collected wastes should be properly treated or disposed of by a licensed
waste disposal company.
equipment
Prevent and contains ills and drips.
SPPP Preventative Maintenance and Good Housekeeping Program
maintenance
I Do all cleaning at a centralized station so the solvents stay in one area.
SPPP Preventative Maintenance and Good Housekeeping Program
areas (including
1 Remove n arts that are dipped in liquid slow) to avoids ills.
aa
SPPP Preventative Maintenance and Good Housekeeping Program
aircraft service
Use dri _s drain boards and drying racks to direct drips back into a fluid holding tank for reuse.
SPCC
Drain all parts of fluids prior to disposal. Oil filters can be crushed and recycled.
SPCC
Piedmont Triad International Airport NCS000508
NPDES Permit Renewal Application Page 2 of 5 10/29/2014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Best Management Practices (continued)
Pollutant Source
Airport BMP I
PTIA Status
areas)
Transfer used fluids to the proper container promptly; do not leave full drip pans or other open
containers around the shop. Empty and clean drip pans and containers.
SPCC
Clean up leaks, drips, and other spills without using large amounts of water. Use absorbents for dry,
cleanup whenever possible.
SPCC
Prohibit the practice of hosing down an area where the practice would result in the discharge of
pollutants to a stormwater system.
SPPP Preventative Maintenance and Good Housekeeping Program
Prohibit pouring liquid waste into floor drains, sinks, outdoor storm drain inlets, or other storm
drains or sewer connections.
SPPP Preventative Maintenance and Good Housekeeping Program
Maintain an organized inventory of materials.
SPPP Preventative Maintenance and Good Housekeeping Program
Eliminate or reduce the number and amount of hazardous materials and waste by substituting
nonhazardous or less hazardous materials.
SPPP Preventative Maintenance and Good Housekeeping Program
Label and track the recycling of waste material e.., used oil spent solvents, batteries).
SPPP Preventative Maintenance and Good Housekeeping Program
Store batteries and other significant materials inside.
SPPP Preventative Maintenance and Good Housekeeping Program
Dispose of greasy rags, oil filters, air filters, batteries, spent coolant, and degreasers in compliance
r
with RCRA regulations.
Perform all cleaning operations indoors or under covering when possible. Conduct the cleaning
operations in an area with a concrete floor with no floor drainage other than to sanitary sewers or
treatment facilities.
SPPP Preventative Maintenance and Good Housekeeping Program
If operations are uncovered, perform them on a concrete pad that is impervious and contained.
Park vehicles and equipment indoors or under a roof whenever possible and maintain proper
control of oil leaks/spills.
SPPP Preventative Maintenance and Good Housekeeping Program
Check vehicles closely for leaks and use pans to collect fluid when leaks occur.
SPCC
Use berms, curbs, grassed swales, or other diversion measures to ensure that stormwater runoff
from other parts of the facility does not flow over the maintenance area.
Collect the stormwater runoff from the cleaning area and provide treatment or recycling.
Discharge vehicle wash or rinse water to the sanitary sewer (if allowed by sewer authority),
wastewater treatment, a land application site, or recycle on -site. DO NOT discharge washwater to a
storm drain or to surface water.
Inspect the maintenance area regularly to ensure BMPs are implemented.
SPPP semi-annual Facility Inspections
Inspect the maintenance area regularly for proper implementation of control measures.
SPPP semi-annual Facility Inspections
Train em to ees on proper waste control and disposal procedures.
SPPP trainingconducted annual)
Aircraft, ground
Perform all cleaningoperations indoors.
SPPP Preventative Maintenance and Good Housekeeping Program
vehicle, and
Confine activities to designated areas outside drainage pathways and awayfrom surface waters.
SPPP Preventative Maintenance and Good Housekeeping Program
equipment
If washing outdoors, cover the cleaning operation and ensure that all washwaters drain to the
intended collections stem.
SPPP Preventative Maintenance and Good Housekeeping Program
cleaning areas
Use phosphate -free biodegradable detergents.
SPPP Preventative Maintenance and Good Housekeeping Program
Contain and recycle washwaters.
SPPP Preventative Maintenance and Good Housekeeping Program
Collect stormwater runoff from the cleaning area and provide treatment or recycling.
Ins ect cleaning area regularly to ensure BMPs are implemented and maintained.
SPPP semi-annual Facility Inspections
Train employees on proper washing procedures.
SPPP training conducted annual)
Aircraft, ground
Store aircraft, ground vehicles and equipment indoors.
SPPP Preventative Maintenance and Good Housekeeping Program
vehicle, and
Cover the storage area with a roof.
SPPP Preventative Maintenance and Good Housekeeping Program
equipment
Store aircraft ground vehicles and equipment awaiting maintenance in designated areas only.
SPPP Preventative Maintenance and Good Housekeeping Program
Park leaking deicing trucks in contained areas.
SPPP Preventative Maintenance and Good Housekeeping Program
storage areas
Install perimeter drains, berms, and dikes around storage areas to limit run-on.
SPPP Preventative Maintenance and Good Housekeeping Program
Use absorbents for dry cleanup fors ills and leaks.
SPPP Preventative Maintenance and Good Housekeeping Program
Use drip pans under all vehicles and equipment for the collection of fluid leaks.
SPPP Preventative Maintenance and Good Housekeeping Program
Clean pavement surface to remove oil and grease without using large amounts of water.
SPPP Preventative Maintenance and Good Housekeeping Program
Reg larly sweep area to minimize debris on the ground.
SPPP Preventative Maintenance and Good Housekeeping Program
Provide dust control if necessary. When controlling dust, sweep and/or apply water or materials that
will not impact surface or ground water.
Dust control regularly provided on construction projects, typically utilizing water
Inspect the storage yard for filling drip pans regularly to ensure BMPs are implemented.
SPPP semi-annual Facility Inspections
Train employees on procedures for storage and inspection items. I
SPCC and SPPP training conducted annual)
MaterialStore
materials indoors.
SPPP Preventative Maintenance and Good Housekeeping Program
Piedmont Triad International Airport NC5000508
NPDES Permit Renewal Application Page 3 of 5 1012912014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Best Management Practices (continued)
Pollutant Source
Airport BMP
PTIA Status
areas
Maintain good integrity of all storage containers (e.g., used oils, hydraulic fluids, spent solvents,
waste aircraft fuel).
SPPP Preventative Maintenance and Good Housekeeping Program
Create a centralized storage area for waste materials.
SPPP Preventative Maintenance and Good Housekeeping Program
Cover and/or enclose chemical storage areas (including temporary cover such as a tarp that
prevents contact with precipitation).
SPPP Preventative Maintenance and Good Housekeeping Program
Provide secondary containment around chemical storage areas.
SPCC Plan
If containment structures have drains, ensure that the drains have valves, and that valves are
maintained in the closed position. Institute protocols for checking/testing stormwater in
containment areas priortodischarge.
SPCC Plan
Locate storage areas away from high traffic areas and surface waters.
SPPP Preventative Maintenance and Good Housekeeping Program
Inspect storage tanks and piping systems (pipes, pumps, flanges, couplings, hoses, and valves) for
failures or leaks and perform preventive maintenance.
SPCC Plan
Plainly label all containers.
SPPP Preventative Maintenance and Good Housekeeping Program
Maintain an inventory of fluids to identify leakage.
SPPP Preventative Maintenance and Good Housekeeping Pro ram
Provide fluid level indicators.
SPCC Plan
Properly dispose of chemicals that are no longer in use.
SPPP Preventative Maintenance and Good Housekeeping Program
Store and handle reactive, ignitable, or flammable liquids in compliance with applicable local fire
codes, local zoning codes and the National Electric Code.
SPPP Preventative Maintenance and Good Housekeeping Program
Provide drip pads/pans where chemicals are transferred from one container to another to allow for
recycling of spills and leaks.
SPPP Preventative Maintenance and Good Housekeeping Program
Develop and implement spill plans or spill prevention, containment, and countermeasure (SPCC)
lans, if required for your facility.
SPCC Plan adopted and implemented
Train employees ins ill prevention and control and proper materials management.
SPCC and SPPP training conducted annual)
Airport fuel
system and
Conduct fueling operations (including the transfer of fuel to tank trucks) on an impervious or
contained pad and under a roof or canopy where possible. Covering should extend beyond spill
containment ad to prevent rain from entering.
SPCC Plan
fueling areas
When fueling in uncovered area, use concrete pad (asphalt is not chemically resistant to the fuels
being handled).
Commercial aircraft fueling is currently conducted on concrete pavement. GA aircraft fueling is conducted on
asphalt pavement
Develop and implement a system to report any spill exceeding 5 feet in any direction or which has
entered the storm drainage system.
SPCC Plan specifies spill reporting
Use drip pans and absorptive materials beneath aircraft during fueling operations where leaks or
spills of fuel can occur and where making and breaking hose connections.
SPCC Plan
Use fueling hoses with check valves to prevent hose drainage after filling.
SPCC Plan
Insure that storm water valves, plugs and similar appurtenances are closed during fuel transfer
operations.
SPCC Plan
Provide spill kits on all fuel trucks, at fueling stations, in each hangar and at strategic locations. Each
kit should have at a minimum, loose absorbent, pigs, broom and shovel. Store used materials in
individual sealed container and labeled to ensure proper handling and disposal as a hazardous
material.
SPCC Plan
Keep spill cleanup materials readily available.
SPCC Plan
Clean up spills and leaks immediately.
SPCC Planspecifies immediate leak ands ill clean u
Use dry cleanup methods for fuel areas rather than hosing down the fuel area. Sweep up absorbents
as soon asspilled substances have been absorbed.
SPCC Plan
Uses ill and overflow protection devices.
SPCC Plan
Minimize run-on of stormwater into the fueling area by grading the area such that stormwater only
runs off.
Collect stormwater runoff and provide treatment or recycling.
SMP
Provide curbing or posts around fuel pumps to prevent collisions from vehicles.
Protection provided against collision
Regularly inspect and perform preventive maintenance on fuel storage tanks to detect potential
leaks before they occur.
SPCC Plan specifies fuel storage tank inspection and maintenance
Inspect the fueling area for leaks ands ills.
SPCC Plan
Do not allow "topping off' of the fuel in the receiving equipment.
SPCC Plan
Train personnel on vehicle fueling BMPs.
SPCC and tenant plans
Piedmont Triad International Airport NCS000508
NPDES Permit Renewal Application Page 4 of 5 1012912014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Best Management Practices (continued)
Pollutant Source
Airport BMP
PTIA Status
Storing liquid
If area is uncovered, connect sump outlet to sanitary sewer (if allowed by the sewer authority) or an
fuels
oil/water separator, catch basin filter, etc. If connecting to a sanitary sewer check with the system
operator to ensure that the discharge is acceptable. If implementing separator or filter technologies
ensure that regular inspections and maintenance procedures are in place.
Develop and implement spill plans.
SPCC Plan adopted and implemented
Train employees ins ill prevention and control.
SPCC training conducted annual)
Provide secondary containment, such as dikes, with a height sufficient to contain a spill (the greater
SPCC Plan adopted and implemented
of 10 percent of the total enclosed tank volume or 110 percent of the volume contained in the
largest tank).
If containment structures have drains, ensure that the drains have valves, and that valves are
SPCC Plan adopted and implemented
maintained in the closed position. Institute protocols for checking/testing stormwater in
containment areas prior to discharge.
Use double -walled tanks with overflow protection.
SPCC Plan adopted and implemented
Keep liquid transfer nozzles hoses in secondary containment area.
applied at all PTIA facilties
Store drums indoors when possible.
applied at all PTIA facilities
Store drums, including empty or used drums, in secondary containment with a roof or cover
applied at all PTIA facilities
(including temporary cover such as a tarp that prevents contact with precipitation).
Provide secondary containment, such as dikes or portable containers, with a height sufficient to
SPCC Plan adopted and implemented
contain a spill (the greater of 10 percent of the total enclosed tank volume or 110 percent of the
volume contained in the largest tank).
Clearly label drum with its contents.
applied at all PTIA facilities
Deicing chemical
I Store bulk aircraft deicing fluids in contained areas.
ADF subject to SPCC Plan at PTIA
loading areas
Load deicing trucks in contained areas.
ADF subject to SPCC Plan at PTIA
Piedmont Triad International Airport NC5000508
NPDES Permit Renewal Application Page 5 of 5 1012912014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
5. Significant Changes
Changes in design, construction, operation, or maintenance at the Piedmont Triad International Airport
(PTIA) that have a significant effect on the potential for the discharge of pollutants to surface waters
require amendment of the Stormwater Pollution Prevention Plan (SPPP) during annual review. Annual
SPPP revisions have included:
• Lists of significant spills or leaks'of pollutants for the previous three years, or the notation that
no spills have occurred.
• Re -certification that active Stormwater Discharge Outfalls (SDOs) have been evaluated for the
presence of non-stormwater discharges.
• Re-evaluation of the effectiveness of the BMPs listed in the BMP Summary of the Stormwater
Management Plan - completed Annual Compliance Surveys and Semi -Annual Facility Inspection
Surveys document preventative maintenance and good housekeeping and the facility
inspections.
• Tiered Monitoring Responses include documentation of atypical conditions noted during
qualitative monitoring and tiered responses to benchmark exceedances recorded during routine
and deicing event analytical monitoring.
• Employee SPPP Training.
• Annual certification that PTIA is in compliance with 40 CFR Part 449.10(a) by not using airfield
deicing products that contain Urea.
The following changes in industrial activities at PTIA with potential to affect stormwater runoff have
occurred since July 1, 2010:
• Construction projects (no change in NPDES criteria) -
o New Runway 5L/23R
o Taxiway E
o Honda Production Facility
o Taxiway K Extension
o Taxiway E Extension
o Taxiway D Extension
o Aircraft Rescue and Fire Fighting (ARFF) Station
o Timco Apron Widening
o Honda Maintenance Repair and Overhaul (MRO) Facility
o Honda Connector Road
o Taxiway M Extension
• Completion of the New Runway 5L/23R and the Fed Ex and Honda facilities resulted in
compliance monitoring adjustments (NCDENR concurred 06/25/2012) -
o SDO 021 outfall (and monitoring) eliminated, stormwater rerouted to SOO 020
o SDO 022 outfall (and monitoring) eliminated, stormwater rerouted to SDO 023
o Fed Ex Pond 2 Inlet 34 monitoring discontinued due to non-SDO status
o FedEx Pond 3 Inlets 35 and 37 monitoring discontinued due to non-SDO status
o Honda Pond 1 Inlet 39 monitoring discontinued due to non-SDO status
o SOO 040 monitoring added at completion of Honda Production facility
o SDO 062 monitoring added at completion of New Runway 5L/23R
o SDO 003 moved approximately 200 feet downslope at completion of Honda MRO facility
• Repair and downstream stabilization of SDO's 023, 030, and 033 recommended by NCDENR
based on monitored turbidity benchmark exceedances (NCDENR concurred 09/08/2014)
Piedmont Triad International Airport NCS000508
NPOES Permit Renewal Application Page 1 of 2 11/26/2014

Supplemental Information Required for Renewal of Individual NPDES Stormwater Permit
Significant Changes (continued)
Updates to the 2010 Tenants (NCDENR notified 12/05/2011) result in potential Co-Permittee
changes (see Table 5.1 for list of suggested 2015 Co-Permittees) -
o Dynamic Airways and JBTAeroTech are new (since 2010) PTIA tenants
o Alamo/National Car Rental and Enterprise Rental Car share facilities; Carolina Aircraft.
and Koury Aviation share facilities; Delta Airlines, Frontier Airlines, and Delta Global
Services share facilities; Allegiant Air industrial activity is the responsibility of Quantem
Aviation Services; Jetstream Ground Services is responsibility of Envoy, Piedmont Triad
ARFF Station/Command Ctr. is the responsibility of Piedmont Triad Airport Authority
(PTAA ; Avis Rent A Car merged with Budget Rent a Car; Continental Airlines merged
with United Airlines; US Airways merged with American Eagle and are now Envoy;
Cessna is now Textron Atlantic Aero has been acquired by Landmark; and Timco is now
Haeco Airframe Services.
o Chatouqua Airlines (now Republic Airlines), Sondhill Delivery Service, TAA Flight Training,
Triad Transportation, and Worldwide Flight Services present no exposure potential.
AvisBudget, Enterprise, and Hertz propose no exposure certification.
0 360 Communications/American Tower, Clear Channel Interspace Airports, FAA, G4S
Secure Solutions, Interstate Telecommunications, Level Communications, Marriott,
Poradies-Triad Gift Shops, Preferred Building Maintenance, Prime Flight Services, Prism
Group, Select Service Partner, Shoeshine Partner, Triad Aviation Academy, Truliant
Federal Credit Union, US Ground Services, and Wells Fargo Bank perform no industrial
activities [vehicle maintenance (including vehicle rehabilitation, mechanical repairs,
painting, fueling, and lubrication); equipment cleaning operations; or airport deicing
operations) at their PTIA facilities.
o Aviation Repair Technologies, Champion Cartage, Comair, Northwest Airlines, Premier
Transportation, Quickflight Services, Smartecarte, Trodewinds (now Skylease Cargo), and
United States Postal Service are no longer PTIA tenants
o Arc Ventures, Big Daddy Detailing, DollarThrifty, Sharpe Bros., and USA Parking Valet are
not located at the Airport, but lease separate, off -site parcels owned by PTAA
Table 5.1 Suggested 2015 PTIA NPDES Co-Permittees
1.
Delta
2.
DHL
3.
Dynamic
4.
Envoy
S.
Fed Ex
6.
GTCC
7.
Haeco
8.
Honda
9.
JBT
10.
Koury
11.
Landmark
12.
LFG
13.
PTAA
14.
Quantem
15.
Textron
16.
United
17.
UPS
18.
VF
The gas turbine compressor washing process proposed in September 2011 by Comair was reviewed by
NCDENR but not instigated at PTIA and Comair is no longer an Airport tenant.
Piedmont Triad International Airport NC5000508
NPDES Permit Renewal Application Page 2of2 1112612014

North Carolina Division of Energy, Mineral, and Land Resources - Stormwater Permitting
Facility Name:
Permit Number:
Location Address:
County:
"I certify, under penalty of law, that the Stormwater Pollution Prevention Plan (SPPP) document and all
attachments were developed and implemented under my direction or supervision in accordance with a system
designed to assure that qualified personnel properly gather and evaluate the information required by the SPPP.
Based on my inquiry of the person or persons who manage the system, or those persons directly responsible
for gathering the information, the information gathered is, to the best of my knowledge and belief, true,
accurate and complete."
And
"I certify that the SPPP has been developed, signed and retained at the named facility location, and the SPPP
has been fully implemented at this facility location in accordance with the terms and conditions of the
stormwater discharge permit."
And
" I am aware that there are significant penalties for falsifying information, including the possibility of fines and
imprisonment for knowing violations."
Signature
Kevin J. Baker, P.E.
Print or type name of person signing above
Date V2'�?(i I
Executive Director
Title
SPPP Certification 10/13.

_�. PIEDMONT
TRIAD
AIRPORT AUTHORITY®
January 6, 2004
Mr. Bradley Bennett
North Carolina Department of Environmental and Natural Resources
Division of Water Quality, NPDES Unit
1517 Mail Service Center
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 the recommendation of NCDENR, and in the interest of limiting the amount
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 comments
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, or Mr. Van Noah at Baker at 336/931-1500 with any questions.
Sincerely,
i ONT TRIAD AIRPO T AUTHORITY
L. Elm re
r 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 Creek located
northwest of the airport, Horsepen Creek located southeast of the airport, and Deep River located
south of the airport. The attached diagrams entitled Proposed NPDES Outfalls shows the
location of the airport outfalls and approximate drainage areas. PTIA is classified as SIC 45
(Transportation by Air) or NAILS 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 Storm Water Permit Application. The basis for petition is 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."

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 identical material management practices (such as secondary containment
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.

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., CESSNA, Tradewinds) are large structures
used for the storage and maintenance of aircraft and servicing materials. Typical used or
stored materials include oils and greases, 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 foutine 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 CPR 122.26 (b)(12) as
raw materials, fuels, materials such as solvents, detergents, and plastic pellets, hazardous
substances, any chemical in the facility that are required to be reported under SARA 313, 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 (ASTs) 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.
• Airline Service Facilities/Fixed-Base Operators - 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 recital 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).
-4-

• 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
material, preventing the spill from entering navigable waters. PTIA has a Spill Prevention
Control and Countermeasures (SPCC) Plan prepared in order to comply with Oil Regulations (40
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 tank 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 1 10 % of the
entire contents of the largest single tank. The diked areas are sufficiently 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 (AWAS) 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 ASfs 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
arc 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.
-6-

4. Flow Characteristics
Demonstration of Why Outfalls are Substantially Identical in terms of Plow, as Determined by
the Estimated Runoff Coefficient and Approximate Drainage Area 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 Plorsepen 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 USTs. The majorities of the UST'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 aromatic hydrocarbons (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 - Outfalls 003, 004, 005, 008, 013, 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
-8-

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
Hangar (currently operated by TIMCO). The estimated runoff coefficients for 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 arc associated
with areas where aircraft refueling, and large -quantity fuel storage and transfer activities arc
-9-

conducted by the airport tenants, which include Atlantic Aero, Piedmont/1-lawthorne, 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. Outfalls 014 and 015 (on property leased by Burlington Industries) contain
stormwater discharges associated with Jet A fuel storage. Outfalls 021, 022 and 023 (on property
leased by Atlantic Aero and Piedmont/Flawthorne are associated with the storage of Jet A fuel
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 PiedmonUl-lawthorne 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, isopropyl benzene,
naphthalene, fluorine, ethylene dibromide and 1,2-dichloroethane.
GROUP 5 - Outfalls 027, 028 and 032
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 43 (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 BTEX, oil related P AI -Is (flourene
naphthalene, etc.), lead, MTBE, isopropylbenzene, and ethylene dibromide.

TABLE 1
PIEDMONT TRIAD INTERNATIONAL AIRPORT
STORMWATER RUNOFF COEFFICIENTS
Drainage
I
Area Drained
I
Impervious Area
Unpaved Area
Runoff
I
Outfall
Basin
(Acres)
(Acres)
(Acres)
Coefficient
Tenants
001
HP-5 (1)
ill
2.5
108.5
0.51
PTAA/Airport Maintenance
002
HP-5 (1)
ill
2.5
108.5
0.51
PTAA/Airport Maintenance
003
HPA (1)
156
27
129
0.57
None
004
HP-4 (1)
156
27
129
0.57
None
005
HP-3
30
6
24
0.58
None
006
HP-6
45
26
19
0.73
TIMCO
007
HP-1
128
38.4
89.6
0.62
Cessna/Citation, TIMCO
008
HP-9
32
4
28
0.55
None
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
014
DR-4 (1)
13.7
3.3
10.4
0.60
Burlington
015
DR-4 (1)
13.7
3.3
10.4
0.60
Burlington
016
DR-3
36
18
18
0.70
Tradewinds; PTAA
O16a
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
O18
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
9A
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
BC-5
13
10.5
2.5
0.82
PTAA
026
BC-6
27
19.5
7.5
0,79
None (Parking Decks)
027
BC-7
53
31
22
0.73
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
Gasoline, New/Used oil,
Diesel
Fill Port catch basin; Planned
stormwater management pond
0.51
002
Horsepen Creek
111
Gasoline, New/Used oil,
Diesel
Fill Port catch basin; Planned
stormwater managementpond
0.51
016a
Deep River
13.7
Gasoline, New/Used oil,
Diesel
Fill Port catch 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
Grass area runoff only (no industrial activities or significant materials stored).
009
Horsepen Creek
36
None
None
0.50
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
I
Significant Materials
I
Storm Water Management
I
Runoff
Outfall
Location
(acres)
Stored
Practices
I CoeKcient
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
Fill port catch basin; Drainage
swale with manually -operated
015
Deep River
13.7
Jet A Fuel
valve
0.60
Jet A Fuel, AV Gas,
Secondary containment dikes;
021
Brush Creek
17.7
Gasoline, New/Used Oil
Oil/water 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
1 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 Creek
12
Gasoline, New/Used Oil
stormwater management pond
0.58
Fill Port catch basin; Planned
030
Brush Creek
42
New/Used Oil
stormwater management 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. Based 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-

01"W4
MC®ENR
North Carolina Department of Environment and Natural
Division of Water Quality
Beverly Eaves Perdue
Governor
Mr. Kevin J. Baker
Piedmont Triad Airport Authority
PO Box 35445
Greensboro, NC 27425
Dear Mr. Baker:
Colleen H. Sullins
Director
June 4, 2010
N.C. Peol. oY r :
JUN 0 7 2010
Wmston.s:
Regional o}{,n,
Dee Freeman
Secretary
Subject: Final NPDES Stormwater Permit
Permit NCS000508
Piedmont Triad International Airport
Guilford County
h-. re--. 3nse to -)ur renewal application for contanu A coverage under NPDES stormwa ter permit
N,-L;000508, the Division of Water Quality (DWQ) is forwarding herewith the subject state - NPDES
permit. This permit is issued pursuant to the requirements of North Carolina General Statute 143-215
.1 and the Memorandum of Agreement between North Carolina and the U.S. Environmental
Protection Agency (EPA) dated October 15, 2007 (or as subsequently amended).
This final permit includes a number of significant changes from the draft permit sent to you on
January 13, 2010 including:
Incorporation of comments as described in the March 15, 2010 letter sent to Mr. George
House;
Modification to the Tiered Response system as proposed by the May 7, 2010 letter received
from Mr. Bill Cooke;
Revised effective data and monitoring schedule.
The comments received with Mr. Cooke's May 7, 2010 letter, in addition to those heard at the March
29, 2010 meeting between DWQ and PTAA, were thoroughly reviewed and carefully considered prior
to finalization of the permit. The comments served to further our understanding of PTAA's concerns
with the permit's requirements and the rationale behind some of the proposed changes. The
following section contains our responses to Mr. Cooke's letter and addresses the two requested pernut
modifications.
1. Modification of the Tiered Response System
The proposed modifications to the Tiered Response system were accepted with the minor insertion of
"causing or contributing to" language in two places in the second paragraph of the last box. We feel
Wetlands and Stormwater Branch
1617 Mail Service Center, Ralegh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: 91M07-63001 FAX: [phone] Customer Service: 1-877-623-6748
Internet: www.nwaterquality.org
An Fonal Onoonunity 1 ARrmzlive Action Emmover
Noi thCw-olina
Naturally

Mr. Kevin Baker
Piedmont Triad Airport Authority
Permit No. NCS000508
the modifications, as incorporated, capture the intent of our original Tier Response write-up and do so
in a manner that is more clearly defined and agreeable to both PTAA and DWQ.
2. Elimination of BOD/COD Benchmark Values for De-icing Events
This proposed change was not incorporated into the final permit. Each argument supporting this
change is addressed individually.
a. Low Volume of Glycol Use: While the total volume of glycol used is less than EPA's MSGP
criterion of 100,000 gal/yr, 25,000 gallons of annual glycol use still presents a significant
concern from a water quality perspective giwm the considerable oxygen demand exerted
by de-icing compounds. PTIA is one of the largest users of de-icing fluids among all
permitted airport facilities under our prokram. Thus, removal of benchmark values based
on volume usage is not warranted.
b. Intermittent Use: This argument contends that glycol use at PTIA is sporadic and not
representative of typical discharge and that impacts to the receiving stream are short-lived.
It is agreed that de-icing is an episodic activity. The duration of impacts fo water quality
has not been adequately established to assess the nature of impacts as -short-lived.
Intermittent use of glycol de-icers alone is not supportive of BOD/COD benchmark
removal.
c. Absence of Correlation between BOD and DO in Analytical Results: At this time we do not
feel that the data collection, reporting, or interpretation is sufficiently consistent or robust
to support this argument for the removal of BOD/COD benchmark concentrations. More
so, even if analytical data were to show limited effect on instream DO by the introduction
of BOD, this relationship or lack thereof, would not diminish DWQ's concern about the
introduction of oxygen -consuming pollutsn!�i to the receiving streams. Our program's
focus is the elimination of pollutant discharges, and part of that process is to place
benchmark values, where available and applicable, to assist in the management of
pollutant discharges. To that effect, both BOD/COD monitoring (with benchmark
concentrations) at cutfall locations and DO monitoring instream are useful and warranted
in the final permit.
d. Limited Downstream Impact: This point argues that glycol travels a relatively short period
of time before emptying into Lake Higgins and Lake Brandt where substantial dilution
occurs. We are unable to accept dilution as a compelling argument to remove the
benchmark value for a parameter of concern. We agree that analytical data downstream
show generally high DO concentrations as expected during cold -weather months but do
not have enough comparable data to make an assessment of glycol impacts. It was noted
on the five dates that DO was monitored both upstream at PTIA and downstream in
Horsepen Creek, significant variation in DO levels was observed ranging from 1.5,r�g/L -
9.0 mg/L between the average of the upstream sites and the downstream Greensboro -
monitored site. As such, we are unable to withdraw benchmark conceniraions from the
associated oxygen demand monitoring based on downstream test results.
e. Retention of DO Benchmark Value as Appropriate Measure of Impacts: Based on historical
results, we do not anticipate that compliance with the DO benchmark value or water
quality standard will be problematic for PTAA. Furthermore, with modifications to the

Mr. Kevin Baker
Piedmont Triad Airport Authority
Permit No. NCS000508
Tier language as proposed by PTAA and incorporated by DWQ with minor additions,
future DWQ response actions associated with the last box of the Tiers including the
structural controls that PTAA has expressed monetary concerns about will be focused on
those, "...as may be necessary to prevent the permittee's discharge from causing or
contributing to any violation of water quality standards...".
f. Existing Control Strategy: We acknowledge and appreciate the considerable effort and
investment by PTAA to minimize unnecessary glycol discharges through carrier and
personnel training, implernentaLiion of an SPCC Plan, and particularly, the Federal Express
collection system.
g. Cost to Eliminate Discharge: The estimated cost of constructing containment systems at
each end of Runway 5L/23L to eliminate all glycol discharge was reviewed and at this time
appears unwarranted.
h. De-icing is Required for Aircraft Safety: DWQ agrees that de-icing procedures are an
integral part of PTAA's goal to ensure aircraft safety during cold -weather months. Our
goal is to not to restrict or hamper this safety measure but to minimize potential impacts
and protect water quality. We feel that our goals are not mutually exclusive and pledge to
work with PTAA on this issue should difficulties arise.
DWQ appreciates the thoroughness and level of detail provided in all correspondence from PTAA
throughout the permit renewal process. We also commend you on your past and present
commitment to comply with permit requirements and look forward to assisting PTAA in the future
maintain this valued record of cooperation.
If any parts, measurement frequencies or sampling requirements contained in this pernut are
unacceptable to you, you have the right.to an adjudicatory hearing upon written request within thirty
(30) days following receipt of this letter. This request must be in the form of a written petition,
conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of
Administrative Hearings, Post Office Drawer 27447, Raleigh, North Carolina 27611 -7447. Unless such
demand is made, this decision shall be final and binding.
This permit does not affect the legal requirements to obtain other permits which may be required by
the Division of Water Quality or permits required by the Division of Land Resources, Coastal Area
Management Act or any other Federal or Local governmental permit that may be required.
If you have any questions or comments concerning this permit, contact Cory Larsen at [phone]
or [e-mail] or Ken Pickle at [phone] or [e-mail].
Sincerely,
for Coleen H. Sullins, Director

Mr. Kevin Baker
Piedmont Triad Airport Authority
Permit No. NCS000508
cc: Mr. Corey Basinger, Winston-Salem Regional Office
Mr. Bill Cooke, Cooke & Cooke, LLP,100 South Elm St, Greensboro, NC 27401
Mr. George House, Brooks, Pierce, McLendon, Humphrey & Leonard, LLP, PO Box 26000,
Greensboro, NC 27420
Mr. Mike Mitchell, EPA Region IV
Stormwater Permitting Unit
Central Files
Attachments
I
A

NCS000508
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE STORMWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful
standards and regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended,
PIEDMONT TRIAD AIRPORT AUTHORITY
is hereby authorized to discharge stormwater from a facility located at
Piedmont Triad International Airport
6415 Bryan Blvd.
Greensboro, NC
Guilford County
to receiving waters designated as Brush Creek, Horsepen Creek, and East Fork Deep River, class
WS-III; NSW and WS-IV streams in the Cape Fear River Basin, in accordance with the
discharge limitations, monitoring requirements, and other conditions set forth in Parts I, 11, III,
IV, V and VI hereof.
This pennit shall become effective July 1, 2010.
This permit and the authorization to discharge shall expire at midnight on June 30, 2015.
Signed this day,the 4`1' of June , 2010.
for Coleen H. Sullins Director
Division of Water Quality
By the Authority of the Environmental Management Commission

Pennit No. NCS000508
TABLE OF CONTENTS
PART I INTRODUCTION
Section A: Individual Permit Coverage
Section B: Permitted Activities
Section C: Location Map
PART II MONITORING, CONTROLS, AND LIMITATIONS FOR PERMITTED
DISCHARGES
Section A: Stormwater Pollution Prevention Plan
Section B: Routine Analytical Monitoring Requirements
Section C: Qualitative Monitoring Requirements
Section D: De -Icing Event Analytical Monitoring Requirements
PART III STANDARD CONDITIONS FOR NPDES STORMWATER INDNDUAL
PERMITS
Section A: Compliance
and Liability
I.
Compliance Schedule
2.
Duty to Comply
3.
Duty to Mitigate
4.
Civil and Criminal Liability
5.
Oil and Hazardous Substance Liability
6.
Property Rights
7.
Severability
8.
Duty to Provide Information
9.
Penalties for Tampering
10.
Penalties for Falsification of Reports
Section B: General Conditions
1. Individual Permit Expiration
2. Transfers
i

Pennit No. NCS000508
3. Signatory Requirements.
4. Individual Permit Modification, Revocation and Reissuance, or
Termination
5. Permit Actions
Section C: Operation and Maintenance of Pollution Controls
1. Proper Operation and Maintenance
2. Need to Halt or Reduce Not a Defense
3. Bypassing of Stonnwater Control Facilities
Section D: Monitoring and Records
1.
Representative Sampling
2.
Recording Results
3.
Flow Measurements
4.
Test Procedures
5.
Representative Outfall
6.
Records Retention
7.
Inspection and Entry
Section E: Reporting
Requirements
1.
Discharge Monitoring Reports
2.
Submitting Reports
3.
Availability'of Reports
4.
Non-Stonnwater Discharges
5.
Planned Changes
6.
Anticipated Noncompliance
7.
Spills
8.
Bypass
9.
Twenty-four Hour Reporting
10.
Other Noncompliance
11.
Other Information
PART IV LIMITATIONS REOPENER
PART V ADMINISTERING AND COMPLIANCE MONITORING FEE
REQUIREMENTS
PART VI DEFINITIONS and SPECIAL CONDITIONS
ii

Permit No. NCS000508
PART I INTRODUCTION
SECTION A: INDIVIDUAL PERMIT COVERAGE
During the period beginning on the effective date of the permit and lasting until expiration, the
pertnittee and co-permittees listed on the following page are authorized to discharge stormwater
associated with industrial activity.: Such discharges shall be controlled, limited and monitored as
specified in this permit. Discharges covered in this pen -nit are the stonmwater discharges from
the current airport operations (001 through 066) as well as additional stormwater discharge
points that may be created by further modification or expansion of airport operations.
Current discharges 001 through 012 and 038 through 040 discharge to Horsepen Creek. Current
discharges 013 through 019 discharge to East Fork Deep River. Current discharges 020 through
037 and 041 through 066 discharge to Brush Creek.
SECTION B: PERMITTED ACTIVITIES
Until this permit expires or is modified or revoked, the permittee and co-permitees are authorized
to discharge stormwater to the surface waters of North Carolina or separate storm sewer system
that has been adequately treated and managed in accordance with the terms and conditions of this
individual permit. All stormwater discharges shall be in accordance with the conditions of this
permit.
Any other point source discharge to surface waters of the state is prohibited unless it is an
allowable non-stormwater discharge or is covered by another permit, authorization, or approval.
Stormwater discharges allowed by this individual permit shall not cause or contribute to
violations of Water Quality Standards.
This permit does not relieve the pennittee from responsibility for compliance with any other
applicable federal, state, or local law, rule, standard, ordinance, order, judgment, or decree.'
PartI Pagel of2

Permit No. NCS000508
Co-Permittees
Alamo/National Car Rental
Jetstream Ground Services, Inc.
Allegiant Air
Koury Aviation
American Eagle
Landmark Aviation
Atlantic Aero
Lincoln Financial
Aviation Repair Technologies
Marriot Hotel
Avis Rent A Car
Northwest Airlines
Budget Rent a Car
Piedmont Triad Airport Authority
Carolina Aircraft
Piedmont Triad ARFF Station/Command Ctr.
Cessna Citation Service Center
Premier Transportation
Champion Cartage
Prime Flight Services
Chatauqua Airlines
Quantem Aviation Services, Inc.
COMAIR Hangar
Quickflight Services
Continental Airlines
Smartecarte
Delta Airlines
TIMCO
Delta Global Services
Tradewinds
DHL
Triad Transportation
Dollar/Thrifty Rental Car
United Express
Enterprise Rental Car
United Parcel Service
FAA
US Airways
FedEx
US Postal Service
GTCC Aviation Center
USA Parking Valet
Hertz Rent A Car
VF Corporation
Honda Aircraft Company
Worldwide Flight Services
Jetstream Air, LLC
Part I Page 2 of 2

SECTION C: LOCATION MAP Permit No. NCS000508
NCS00O508
M-P Scale 1: 30,000
Piedmont Triad Airport Authority
Piedmont Triad International Airport
Latitude: 360 06' 29" N i
Longitude: 790 56' 31" W
County: Guilford
Receiving Streams: Horsepen Cr, Brush Cr, E Fork Deep
Steam Class: WS-III; PGW, WS-III; NSW, UNS-IN
Sub -basin: 03-06-02 (Cape Fear River Basin)
Facility Location

Permit No. NCS000508
PART 11 MONITORIN,G, CONTROLS, AND LIMITATIONS FOR
PERMITTED DISCHARGES
SECTION A: STORMWATER POLLUTION PREVENTION PLAN
The Permittee shall develop a Stornwater Pollution Prevention Plan, herein after referred to as
the,Plan. This Plan shall be considered public information in accordance with Part III, Standard
Conditions, Section E, Paragraph 3 of.this individual permit. The Plan shall include, at a
minimum, the following items:
Site Plan. The site plan shall provide a description of the physical facility and the
potential pollutant sources which may be expected to contribute to contamination of
stonnwater discharges. The site plan shall contain the following:
(a) A general location map (USGS quadrangle map or appropriately drafted
equivalent map), showing the facility's location in relation to transportation routes
and surface waters, the natne of the receiving water(s) to which the stonnwater
outfall(s) discharges, or if the discharge is to a municipal separate storm sewer
system, the name of the municipality and the ultimate receiving waters, and
accurate latitude and longitude of the point(s) of discharge. The general location
map (or alternatively the site map) shall identify whether each receiving water is
impaired (on the state's 303(d) list of impaired waters) or is located in a
watershed for which a TMDL has been established, and what the parameter(s)
of concern are. .-
(b) A narrative description of storage practices, loading and unloading activities,
outdoor process areas, dust or particulate generating or control processes, and
waste disposal practices. A narrative description of the potential pollutants which
could be expected to be present in the stonnwater discharge from each outfall.
(c) A site map drawn to scale (including a distance legend) showing: the site property
boundary, the stonnwater discharge outfalls, all on -site and adjacent surface
waters and wetlands, industrial activity areas (including storage of materials,
disposal areas, process areas, loading and unloading areas, and haul roads), site
topography, all drainage features and structures, drainage areas for each outfall,
direction of flow in each drainage area, industrial activities occurring in each
drainage area, buildings, existing BMPs, and impervious surfaces. The site map
must indicate the percentage of each drainage area that is impervious.
(d) A list of significant spills or leaks of pollutants that have occurred at the facility
during the three (3) previous years and any corrective actions taken to mitigate
spill impacts.
(e) Certification that the stonnwater outfalls have been evaluated for the presence of
non-stonnwater discharges. The cer,ification statement will be signed in
Part II Page 1 of 13

Pennit No. NCS000508
accordance with the requirements found in Part III, Standard Conditions, Section
B, Paragraph 3. The permittee shall re -certify annually that the stormwater
outfalls have been evaluated for the presence of non-stormwater discharges.
Stormwater Management Plan. The stormwater management plan shall contain a
narrative description of the materials management practices employed which control or
minimize the exposure of significant materials to stormwater, including structural and
nonstructural measures. The stormwater management plan, at a minirriom, shall
incorporate the following:
(a) Feasibility Study. A review of the technical and economic feasibility -of changing
the methods of operations and/or storage practices to eliminate or reduce exposure
of materials and processes to stormwater. Wherever practical, the permittee shall
prevent exposure of all storage areas, material handling operations, and
manufacturing or fueling operations. In areas where elimination of exposure is
not practical, the stormwater management plan shall document the feasibility of
diverting the stormwater runoff away from areas of potential contamination.
(b) Secondary Containment Requirements and Records. Secondary containmen: is
required for: bulk storage of -liquid materials; storage in any amount `f Section
313 of Title III of the Superfund'Amendments and Reauthorization Act (SARA)
water priority chemicals; and storage in any amount of hazardous substances, in
order to prevent leaks and spills from contaminating stormwater runoff. A table
or summary of all such tanks and stored materials and their associated secondary
containment areas shall be maintained. If the secondary containment devices are
connected to stormwater conveyance systems, the connection shall be controlled
by manually activated valves or other similar devices.(which shall be secured
closed with a locking mechanism), and any stormwater that accumulates in the
containment area shall be at a minimum visually observed for color, foam, outfall
staining, visible sheens and dry weather flow, prior to release of the accumulated
stonnwater. Accumulated stormwater shall be released if found to be
uncontaminated by any material. Records documenting the individual making the
observation, the description of the accumulated stonnwater, and the date and time
of the release shall be kept for a period of five years.
(c) BMP Summary. A listing of site structural and non-structural Best Management
Practices (BMP) shall be provided. The installation and implementation of BMPs
shall be based on the assessment of the potential for sources to contribute
significant quantities of pollutants to stormwater discharges and data collected
through monitoring of stormwater discharges. The BMP Summary shall include a
written record of the specific rationale for installation and implementation of the
selected site BMPs. The BMP Summary shall be reviewed and updated annually.
Spill Prevention and Response Plan. The Spill Prevention and Response Plan (SPRP)
shall incorporate an assessment of potential pollutant sources based on a materials
inventory of the facility. Facility personnel (or the team) responsible for implementing
Part 11 Page 2 of 13

Permit No. NCS000508
the SPRP shall be identified in a written list incorporated into the SPRP and signed and
datcd.by each individual acknowledging the responsibilities for the plan. A responsible
person shall be on -site at all times during facility operations that have the potential to
contaminate stonnwater runoff through spills or exposure of materials associated with the
facility operations. The SPRP must be site stormwater specific. Therefore, an oil Spill
Prevention Control and Countermeasure plan (SPCC) may be a component of the SPRP,
but may not be sufficient to completely address the stormwater aspects of the SPRP. The
common elements of the SPCC with the SPRP may be incorporated by reference into the
SPRP.
4. Preventative Maintenance and Good Housekeeping Program. A preventative
maintenance and good housekeeping program shall be developed. The program shall list
all stormwater control systems, stonnwater discharge outfalls, all on -site and adjacent
surface waters and wetlands, industrial activity areas (including material storage areas,
material handling areas, disposal areas, process areas, loading and unloading areas, and
�. haul roads), all drainage features and structures, and existing structural BMPs. The
program shall establish schedules of inspections, maintenance, and housekeeping
activities of stonnwater control systems, as well as facility equipment, facility areas, and
facility, systems that present a potential for stormwater exposure or stormwater pollution.
Inspection of material handling areas and regular cleaning schedules of these areas shall
be incorporated into the program. Timely compliance with the established schedules for
inspections, maintenance, and housekeeping shall be recorded in writing and maintained
in the SPPP.
Employee Training. Training programs shall be developed and training provided at a
minimum on an annual basis for facility personnel with responsibilities for: spill response
and cleanup, preventative maintenance activities, and for any of the facility's operations
that have the potential to contaminate stonnwater runoff. Facility personnel (or team)
responsible for implementing the training shall be identified, and their annual training
shall be documented by the signature of each employee trained.
6. Responsible Party. The Stormwater Pollution Prevention Plan shall identify a specific
position(s) responsible for the overall coordination, development, implementation, and
revision to the Plan. Responsibilities for all components of the Plan shall be documented
and, position assignments provided.
Plan Alaendment. The pcnnittec shall amend the Plan whenever there is a change in
design, construction, operation, or maintenance which has a significant effect on the
potential for the discharge of pollutants to surface waters. All aspects of the
Stormwater Pollution Prevention Plan shall be reviewed and updated on an annual
basis. The annual update shall include an updated list of significant spills or leaks of
pollutants for the previous three years, or the notation that no spills have occurred. The
annual update shall include written re -certification that the stonnwater outfalls have been
evaluated for the presence of non-stonnwater discharges. Each annual update shall
include a documented re-evaluation of the effectiveness of the BMPs listed in the BMP
Summary of the Stormwater Management Plan.
Part II Page 3 of 13

Pennit No. NCS000508
The Director may notify the permittee when the Plan does not meet one or more of the
minimum requirements of the permit. Within 30 days of such notice, the permittee shall
submit a time schedule to the Director for modifying the Plan to meet minimum
requirements. The permittee shall provide certification in writing (in accordance with
Part I11, Standard Conditions, Section B, Paragraph 3) to the Director that the changes
have been made.
S. Facility Inspections. Inspections of the facility and all stormwater systems. shall occur as
part of the Preventative Maintenance and Good Housekeeping Program at a minimum on
a semi-annual schedule, once during the first half of the year (January to June), and once
during the second half (July to December), with at least 60 days separating inspection
dates (unless performed more frequently than semi-annually). These facility inspections
are different from, and in addition to, the stormwater discharge characteristic monitoring
required in Part 11 B and C of this permit.
9. Implementation. The permittee shall implement the Plan. Implementation of the Plan
shall include documentation of all monitoring, measurements, inspections, maintenance .
activities, and training provided to employees, including the log of the sampling data and
of actions taken to implement BMPs associated with the industrial activities, including
vehicle maintenance activities. Such documentation shall be kept on -site for a period of
five years and made available to the Director or the Director's authorized representative
immediately upon request.
f
Part II Page 4 of,13

Pennit No. NCS000508
SECTION B: ROUNTINE ANALYTICAL MONITORING REQUIREMENTS
Routine analytical monitoring of stormwater discharges shall be performed at each selected
representative stormwater discharge outfall (SDO), as noted in Table 1, and as specified in
Table 2. All routine analytical monitoring shall be performed during a representative storm
event.
Table 1. Representative Outfall Identification
,Represe'ntativ6 DO, ,
�, . ; i . ,1tH� : ,Re resentative;of.,0atfalls r , .,:;�+
004
003, 004, 005, 008, 013, 017, 018, 019, 020, 038; 03y'
006
006, 007, 016
016A
009, 010, 011, 012, 014, 015, 016A, 021, 022, 023
024 and 026
001, 002, 024, 025, 026
027
027,028
030
029, 030, 031, 062, 063, 064, 065, 066.
033
032, 033, 034, 035, 036, 037
A representative storm event is a storm event that measures greater than 0.1 inches of rainfall. The time
between this storm event and the previousstorm event measuring greater than 0.1 inches must be at least
72 hours. A single storm event may have..'a period of no precipitation of up to 10 hours. For example, if
it rains but stops before producing any collectable discharge, a sample may be collected if the next rain
producing a discharge begins within 10 hours.
Part 11 Page 5 of 13

Permit No. NCS000508
Table 2. Routine Analytical Monitnrino RPnnirPmPnfc nt RPnrnePntotivn n,.ts n
Discharge a
Characteristics��
iUn� >
rt
Mclsurement Frequencyt
�� a
Sample
„T. e''..
S1m
Loc"ation3'
Total Suspended Solids
mg/L
Quarterly
Grab SDO
Biochemical Oxygen Demand
mg/L
Quarterly
Grab
SDO
Chemical Oxygen Demand
m L
Quarterly
Grab
SDO
r
TPH / Non -polar Oil & Grease
EPA Method 1664 (SGT-HEM)]
mg/L.
Quarter] y
Q
Grab
SDO
Deterrents (MBAS)
mg/L
Quarterly
Grab
SDO
Turbidity
NTU
Quarterly
Grab
SDO
NH3—Nitrogen
mg/L
Quarterly
Grab
SDO
NO3+NO2—Nitrogen
mg/L
Quarterly
Grab
SDO
Phosphorus, Total
mg/L
Quarterly
Grab
SDO
H
standard
Quarterly
Grab
SDO
Total Rainfa114
inches
Quarterly
Rain Gauge
Footnotes:
1 Measurement Frequency: Four times per year (once per quarter) during a representative storm event.
2 Grab sample collection shall begin within the first 30 minutes of discharge or as soon thereafter as reasonably possible
and shall be completed as expeditiously as practicable.
3 .Sample Location: Samples shall be collected at each representative stormwater discharge outfall (SDO) as specified.in.
Table 1.
4 : For each sampled representative storm event the total precipitation must be recorded. An on -site rain gauge or local rain
gauge reading must be recorded.
The petmittee shall complete the minimum twenty (20) analytical samplings in accordance with
the schedule specified below in Table 3. A minimum of 30 clays must separate sample dates
unless monthly monitoring has been instituted under a Tier Two response.
Part II Page 6 of 13

Permit No. NCS000508
Table 3. Monitoring Schedule
;Monitoring pentid�.tZ,
Sartplc Number
Start
End a
Year 1 - Period 1
I
July I, 2010
September 30, 2010
Year 1 - Period 2
2
October 1, 2010
December 31, 2010
Year 1 -Period 3
3
January 1, 2011
March 31, 2011
Year I -Period 4
4
April 1, 2011
- June 30, 2011
Year 2 -Period 1
5
July I, 2011
September 30, 2011 .
Year 2 - Period 2
6
October 1, 2011
December 31, 2011
`:' ar 2 - Period 3
7
January 1, 2012
March 31, 2012
Year 2 - Period 4
8
April 1, 2612
June 30, 2012
Year 3 - Period 1
9
July 1, 2012
September 30, 2012
Year 3 - Period 2
10
October 1, 2012
December 31, 2012
Year 3 - Period 3
11
January 1, 2013
March 31, 2013
Year 3 - Period 4
12
April 1, 2013
June 30, 2013
Year 4 - Period 1
13
i July I, 2013
September 30, 2013
Year 4 - Period 2
14
October 1, 2013
December 31, 2013
Year 4 - Period 3
15
January 1, 2014
March 31, 2014 - _
Year 4 - Period 4
16
April 1, 2014
June 30, 2014
Year 5 -Period 1
17
July 1, 2014
September 30, 2014
Year 5 - Period 2
18
October 1, 2014
December 31, 2014
Year 5 - Period 3
19
January 1, 2015
March 31, 2015
L Year 5 - Period 4
20
April 1, 2015
June 30, 2015
Footnotes: -
1 Maintain quarterly monitoring during permit renewal process. If at the expiration of the Individual Pennit,
the permittee has submitted an application for renewal of coverage before the submittal deadline, the
pennittee will be considered for renewed coverage. The applicant must continue quarterly monitoring until
the renewed permit is issued.
2 If no representative storm event occurs during the sampling period, the permittee must submit a monitoring
report indicating "No Flow" within 30 days of the end of the sampling period.
Part II Page 7 of 13

Permit No. NCS000508
The permittee shall report the.analytical results from the first sample with valid results within the
monitoring period. The pennittee shall compare monitoring results to the benchmark values in
Table 4. The benchmark values in Table 4 are not permit limits but should be used as guidelines for
the permittee's Stormwater Pollution Prevention Plan (SPPP). Exceedances of benchmark values
must be addressed as provided in and in accordance with the tiered response chart on page 9 of Part
II.
Table 4. Benchmark Values for Routine Analytical Monitoring at Representative
Ontfalls
Discharge Charactertsttcs :<'
Umts
'Benchmark
Total Suspended Solids
mgfL
100
Biochemical Oxygen Demand
mg/L
30
Chemical Oxygen Demand
mg/L
120
TPH / Non -polar Oil & Grease
mg/L
15
Detergents (MBAS)
mg/L
0.5
Turbidity'
NTU
50
NH3—Nitrogen
m`g/L
7.2
NO3+NO2—Nitrogen
mg/L
10
Phosphorus, Total
mg/L
2
pH
standard
6-9
Footnotes:
1 Turbidity: The turbidity benchmark value will become effective beginning in Year 2 of this permit following the
completion of airport runway construction activities.
Part 11 Page 8 of 13

Permit No. NCS000508
-;.
If: The first valid sampling results are above a benchmark value, or outside of the benchmark range, for any
parameter at any outfall or in -stream location;
Then: The pennittee shall:
l . Conduct a stonnwater management inspection of the facility within two weeks of receiving
sam�,Iing results.
2. `.dentify znd evaluate possible causes of the bencl�unark value exceedance.
Identify potential source controls, operational controls, or physical improvements, if any, that could
reduce the difference between the sampling results and the benchmark value and select any such
corrective measure or combination of corrective measures that the permittee determines to be
appropriate and warranted, after due consideration of the cause and nature of the execedance and the
feasibility, cost and effectiveness of such measures.
4. Implement the selected actions, if any, within two months of the inspection, or as soon thereafter
- as reasonably possible.
5. Record each instance of a Tier One response in the Stotmwater Pollution Prevention Plan. Include
the date and value of the benchmark exceedance, the inspection date, the personnel conducting the
inspection, the selected actions, if any, and the date the selected actions were implemented, or, if no
action was implemented, the basis for that decision.
I'ier'Cwo
If: During the term of this permit, the first valid sampling results from two consecutive monitoring periods are
above the benchmark values, or outside of the benchmark range, for any specific parameter at a specific
outfall or in -stream location; .
Then: The permittee shall:
1. Repeat all the required actions outlined above in Tier One.
2. Immediately institute monthly monitoring for each parameter at each outfall where a sampling result
exceeded the benchmark value for two consecutive samples. Monthly (analytical and qualitative)
monitoring shall continue until three consecutive sample results are below the benchmark values or
within the benchmark range.
3. If no discharge occurs during the sampling period, the permittee is required to submit a monthly
monitoring report indicating "No Plow" to comply with reporting requirements.
4. Maintain a record of the Tier Two response in the Stormwater Pollution Prevention Plan.
During the tern of this permit, if the valid sampling results required for the permit monitoring periods exceed
the benchmark value, or are outside the benchmark range, for any specific parameter at any specific outfall or
in -stream location on four occasions, the permittee shall notify the DWQ Regional Office Supervisor in
writing within 30 days of receipt of the fourth analytical results.
T4.i rx>rrnittec wii; then consult with DWQ about feasible, practical, and cost-effective measures that the
permittee could undertake to reduce the difference between the sampling results and the benchmark value and
to avoid causing or contributing to any violation of water quality standards. After consultation with the
pennittee, DWQ may require that the permittee revise, increase, or decrease the monitoring frequency for the
remainder of the permit and may impose such other requirements, if any, as may be necessary to prevent the
Part 11 Page 9 of 13

Permit No. NCS000508
pennittee's discharge from causing or contributing to any violation of water quality standards, including but
not limited to:
• require the permittee to install structural controls; or
• require the permittee to implement other stormwater control measures.
If the inspection and evaluation of a particular sampling result under Tier One or Tier Two show that the
result is not caused by the permittee's operations or facilities, it will not be treated as a benchmark
exceedance for purposes of determining whether four consecutive exceedances have`occurred.
This site discharges to a segment of the East Fork Deep River with an approved Total Maximum
Daily Load (TMDL) for turbidity and fecal colifonn. The Division will consider monitoring
results in detennining whether additional BMPs are needed to control the pollutant(s) of concern
to the maximum extent practicable.
If additional BMPs are needed to achieve the required level of control as mandated by the
TMDL, if any, the penmittee will be required to (1) develop a strategy for implementing
appropriate BMPs, and (2) submit a timetable for incorporation of those BMPs into the permitted
Stonmwater Pollution Prevention Plan.
SECTION C: QUALITATIVE MONITORING REQUIREMENTS
Qualitative monitoring requires a visual,insi5ection of each stormwater outfall regardless of
representative outfall status and shall be performed as specified in Table 5, during tl�e'analytical
monitoring event. Qualitative monitoring is for the purpose of evaluating the effectiveness of the
Stormwater Pollution Prevention Plan (SPPP) and assessing new sources of sto'nnwater pollution.
In the event an atypical condition is noted at a stormwater discharge outfall, the permittee shall
document the suspected cause of the condition and any actions taken.in response to the
discovery. This documentation will be maintained with the SPPP.
Table 5. Qualitative Monitoring Requirements at All Outfalls
Discharge Characteristics '-
Frequency.,;
� l
Monitoring
'Location,7 -
Color
Quarterly
SDO
Odor
Quarterly
SDO
Clarity
Quarterly
SDO
Floating Solids
Quarterly
SDO
Suspended Solids
Quarterly
SDO
Foam
Quarterly
SDO
Oil Sheen
Quarterly
SDO
Erosion or deposition at the outfall
Quarterly
SDO
Other obvious indicators
of stormwater pollution
Quarterly
SDO
Part 11 Page 10 of 13

ro. Permit No. NCS000508
Footnotes:
Measurement Frequency: Four times per year (once per quarter) during a representative storm event, for each
year until either another permit is issued for this facility or until this permit is revoked or rescinded. If at the end
of this permitting cycle the permittee has submitted the appropriate paperwork for a renewal permit before the
submittal deadline, the permittee will be considered for a renewal application. The applicant must continue
quarterly monitoring until the renewed permit is issued. See Table 3 for schedule of monitoring periods through
the end of this permitting cycle.
2 Monitoring Location: Qualitative monitoring shall be performed at each stormwater discharge outfall (SDO)
regardless of representative outfall status.
SECTION D: DE-ICING EVENT ANALYTICAL MONITORING REQUIREMENTS
De-icing event analytical monitoring of stormwater discharges shall be performed at selected
representative SDOs as specified in Table 6. De-icing event analytical monitoring shall be
performed four (4) times per year during qualifying de-icing events resulting in the use of at least
100 gallons of glycol in any concentration. Each monitoring event shall be conducted during a
discharge event at the time of de-icing activities, or during the next separate discharge event, up
to 72 hours following de-icing activities.
Table 6. De-icing Event Analytical Monitoring Requirements for Representative
Outfalls
Discharge Charactei Atres
Units
:. Measurement
Frequencyl
Sample
jype2
Sample .;
Location3>
Ethylene Glycol
m L
4X/yr
Grab
SDO
Pro ylenc Glycol
m , L
4X/yr
Grab
SDO
Biochemical Oxygen Demand
mg/L
4X/yr
Grab
SDO
Chemical Oxygen Demand
m L
4X/yr
Grab
SDO
NH3—Nitrogen
mg/L
4X/yr
Grab
SDO
H
standard
4X/yr
Grab
SDO
Acute Toxicit `t
%
4X/yr
Grab
SDO
"T'olal Glycol A,) lied
gal
4X/yr
Estimate
Total Rainfall
inches
4X/yr
Rain gauge
Footnotes:
I Measurement Frequency: Four times per year during qualifying de-icing events as described above.
2 If the stormwater runoff is controlled by a stornwater detention pond a grab sample of the discharge from the
pond shall be collected within the first 30 minutes of discharge from the pond or as soon thereafter as reasonably
possible.
3 Sample Location: Samples shall be collected at each representative stormwater discharge outfall (SDO) as specified in
Table 1.
4 Acute Toxicity shall be performed in accordance with the Special Conditions page at the end of this pennit.
Monitoring results shall be compared to the benchmark values in Table 8. The benchmark
values in Table 8 are not permit limits but should be used as guidelines for the permittee's
Part 11 Page 11 of 13

Permit No. NCSn;i@a08
Stormwater Pollution Prevention Plan (SPPP). Exceedances of benchmark values must be
addressed as provided in and in accordance with the tiered response chart on page 9 of Part'II
except that item 2 of Tier Two is deleted and replaced with the following requirement:
2. Immediately institute monitoring during one qualifying de-icing event per month for each
parameter at each outfall where a sampling result exceeded the benchmark value for two
consecutive samples. Such monitoring (one per month) shall continue for the remainder of the
de-icing season so.long as a qualified de-icing event occurs during each subsequent month.
In -stream analytical monitoring shall be performed concurrently with each of the four (4)
monitored de-icing events per. year. Each monitoring event shall be conducted during a
discharge event at the time of de-icing activities, or during the next separate discharge event, up
to 72 hours following de-icing activities. In -stream analytical monitoring shall be performed at
selected stream sites as specified in Table 7.
Table 7
Pe -icing l vent Analytical Monitoring Requirements for In -stream Sampling
Parameter a
Units
Measuremefit
;Fie uenc
Sample
Type;'ci:
Sample
Location ,
IS#] through IS#2,
Dissolved Oxygen
mg/L
4X/yr
Grab
IS#5 through IS#8,
IS#10 throu h' IS#] I
IS#I through IS#2,
Turbidity
NTU
4X/yr
Grab
IS#5 through IS#8,
IS#10 through IS#11
IS#1 through IS#2,
pH
standard
4X/yr
Grab,
IS#5 through IS#8,
IS#10 through IS#1 1
IS#1 througMS92, .
Acute Toxicity,
%
47 /yr
Grab
iS#5 through=IS#Il
IS#10through
Footnotes:
I Measurement Frequency: Four times per year during qualifying de-icing events as described above.
2 Sample Location: Samples shall be collected at each identified in -stream location named above.
3 Acute Toxicity shall be performed in accordance with the Special Conditions page at the end of this permit.
Part 11 Page 12 of 13

Permit No. NCS000508
Monitoring results shall be compared to the benchmark values in Table 8. The benchmark
values in Table 8 are not permit limits but should be used as guidelines for the pennittee's
Stormwater Pollution Prevention Plan (SPPP). ). Exceedances of benchmark values must be
addressed as provided in and in accordance with the tiered response chart on page 9 of Part 11
except that item 2 of Tier Two is deleted and replaced with the following requirement:
2. Immediately institute monitoring during one qualifying de-icing event per month for each
parameter at each in -stream location where a sampling result exceeded.the benchmark value for
two consecutive samples. Such monitoring (one per month) shall continue for the remainder of
the de-icing season so long as a qualified de-icing event occurs during each subsequent month.
Table 8. Benchmark Values for De-icing Event Analytical Monitoring for
Representative Outfalls and In -Stream SamDlinu
DtscNarge,Characfenshcs ; !.
ts
{;Benchniai k
Ethylene Glycol
mg/L
14,000
Propylene Glycol
mg/L
N/A
Biochemical Oxygen Demand
mg/L
30
Chemical Oxygen Demand:
mg/L
120
NH3' Nitrogen
mg/L
7.2
pH
Standard units
6-9
Acute Toxicity t
%
>100%
Dissolved Oxygen
mg/L
5
Turbidity,
NTU
50
Footnotes:
I Acute Toxicity: For monitoring purposes, any result with a value of less than >100% would constitute :a
benchmark exceedance.
2 Dissolved Oxygen: For monitoring purposes, any result with a value of less than 5 mg/L would constitute a
benchmark exceedance.
3 Turbidity: The turbidity benchmark value will become effective beginning in Year 2 of this permit following the
completion of airport runway construction activities.
Part 11 Page 13 of 13

Permit No. NCS000508
PART III STANDARD CONDITIONS FOR NPDES STORMWATER INDIVIDUAL PERMITS
SECTION A: COMPLIANCE AND LIABILITY
Compliance Schedule
The permittee shall comply with Limitations and Controls specified for stnrmwater discharges in
accordance with the following schedule:
Existing Facilities already operating but appiying for permit coverage for the first time: The,$tormwater
Pollution Prevention Plan shall be developed and implemented within 12 months of the effective date of the
initial permit and updated thereafter on an annual basis. Secondary containmen , as specified in Part 11,
Section A, Paragraph 2(b) of this permit, shall be accomplished within 12 ,months of the effective date of
the initial permit issuance.
New Facilities applying for coverage for the first time and existing facilities previously permitted and .
applying for renewal under this permit: The Stormwater Pollution Prevention Plan shall be developed and
implemented prior to the beginning of discharges from the operation of the industrial activity and be
updated thereafter on an annual basis. Secondary containment, as specified in Part II, Section A, Paragraph
2(b) of this permit shall be accomplished prior to the beginning of discharges from the operation of the
industrial activity.
2. Duty to Comply
The permittee must comply with all conditions of this individual permit. Any permit noncompliance
constitutes a violation of the Clean Water Act and is grounds for enforcement action; for permit -
termination, revocation and reissuance, or modification; or denial of a permit upon renewal application.
a. The permittee shall comply with standards or prohibitions established under section 307(a) of the
Clean Water Act for toxic pollutants within the time provided in the regulations that establish
these standards or prohibitions, even if the permit has not yet been modified to incorporate the
requirement.
b. The Clean Water Act provides that any person who violates a permit condition is subject to a civil
penalty not to exceed $25,000 per day for each violation. Any person who'negligently violates any
permit condition is subject to criminal penalties of $2,500 to 25,000 per day of violation, or
imprisonment for not more than 1 year, or both. Any person who knowingly violates permit
conditions is subject to criminal penalties of $5,000 to $50,000 per day of violation, or
imprisonment for not more than 3 years, or both. Also, any person who violates a permit
condition may be assessed an administrative penalty not to exceed $10,000 per violation with the
maximum amount not to exceed $125,000. [Ref: Section 309 of the Federal Act 33 USC 1319 and
40 CFR 122.41(a).]
C. Under state law, a daily civil penalty of not more than ten thousand dollars ($10,000) per violation
may be assessedagainst any person who violates or fails to act in accordance with the terms,
conditions, or requirements of a permit. [Ref: NC General Statutes 143-215.6A].
d. Any person may be assessed an adininistrativepenalty by the Director for violating, section •301,
302, 306, 307, 308, 318 or 405 of the Act, or any permit condition or limitation inil>)ementing any
of such sections in a permit issued under section 402 of the Act. Administrative penalties for Class
I violations are not to exceed $10,000 per violation, with the maximum amount of any Class I
penalty assessed not to exceed $25,060. Penalties for Class II violations are not to exceed
Part III Page I of 8

Permit No. NCS000508
$10,000 per day for each day during which the violation continues, with the maximum amount of
any Class II penalty not to exceed $125,000.
3. Duty to Mitigate
The pennittee shall take all reasonable steps to minimize or prevent any discharge in violation of this
individual permit which has a reasonable likelihood of adversely affecting human health or the
environment.
4. Civil and Criminal Liability
Except as provided in Part 111, Section C of this permit regarding bypassing of stormwater control facilities,
nothing in this individual permit shall be construed to relieve the permittee from any responsibilities,
liabilities, or penalties for noncompliance pursuant to NCGS 143-215.3,143-215.6A, 143-215.613, 143-
215:iiC or Section 309 of the Federal Act,.33 USC I S,,19. Furthermore, the permittee is responsible for
consequential damages, such as fish kills, even though the responsibility for effective compliance may be
temporarily suspended.
5. Oil and I lazardous Substance Liability
Nothing in this individual permit shall be construed to preclude the institution of any legal action or relieve
the permittee from any responsibilities, liabilities, or penalties to which the permittee is or may be subject
to under NCGS 143-215.75 et seq. or Section 311 of the Federal Act, 33 USC 1321.
6. Property Rights
The issuance of this individual permit does not convey any property rights in either real or personal
property, or any exclusive privileges, nor does it authorize any injury to private property or any invasion of
personal rights, nor any. infringement of Federal, State or local laws or regulations.
7. Severability
The provisions of this individual permit are severable, and if any provision of this individual permit, or the
application of any provision of this individual permit to any circumstances, is held invalid, the application
of such provision to other circumstances, and the remainder of this individual permit, shall not be affected
thereby.
8. Duty to Provide Information
The permittee shall furnish to the Director, within a reasonable time, any information which the Director
may request to determine whether cause exists for modifying, revoking and reissuing, or terminating the
permit issued pursuant to this individual permit or to determine compliance with this individual permit.
The pennittee shall also furnish to the Director upon request, copies of records required to be kept by this
individual permit.
9. Penalties for Tampering
-
The Clean Water Act provides that any person who falsifies, tampers with, or knowingly renders
inaccurate, any monitoring device or method required to be maintained under this individual permit shall,
upon conviction, be punished by a fine of not more than $10,000 per violation, or by imprisonment for not
more than two years per violation, or by both. If a conviction of a person is for a violation committed after
a first conviction of such person under this paragraph, punishment is a fine of not more than $20,000 per
day;nf violation, or by imprisonment of not more than 4 years, or both
i
PartIII Pagc 2 of 8

Permit No. NCS000508
10. Penalties for Falsification of Reports.
The Clean Water Act provides that any person who knowingly makes any false statement, representation,
or certification in any record or other document submitted of required to be maintained under this
individual permit, including monitoring reports or reports of compliance or noncompliance shall, upon
conviction, be punished by a fine of not more than $10,000 per violation, or by imprisonment for not more
than two years per violation; or by both.
SECTION B: CENL,' AL CONDITIONS
1. Individual Permit Expiration
The pemrittee is hot authorized to discharge after the expiration date. In order to receive automatic
authorization to discharge beyond the expiration date, the permittee shall submit forms and fees as are
required by the agency authorized to issue permits no later than 180 days prior to the expiration date. Any
permittee that has not requested renewal at least 180 days prior to expiration, or any permittee that does not
have a permit after the expiration and has not requested renewal at least 180 flays priorto expiration; will
be subjected to enforcement procedures as provided in NCGS, § 143-215.36 and 33 USC 1251 et. seq.
N�
2. Transfers
This permit is not transferable to any person, except after notice to and approval by the Director. The
Director may require modification or revocation and reissuance of the permit to change the name and
incorporate such other requirements as may be necessary under the Clean Water Act. The Permittee is
required to notify the Division in writing in the event the permitted facility is sold or closed.
3. Signatory Requirements
All applications, reports, or information submitted to the Director shall be signed and certified.
a. All applications to be covered under this individual permit shall be signed as follows:
(1) In the case of a corporation: by a principal executive officer of at least the level of vice-
president, or his duly authorized representative, if such representative is responsible for
the overall operation of the facility from which the discharge described in the permit
.application form originates; ..
(2) In the case of a partnership or limited partnership: by a general partner;
(3) In the case of a sole proprietorship: by the proprietor;
(4) In the case of a municipal, state, or other public entity: by a principal executive officer,
ranking elected official, or other duly authorized employee.
b. All reports required by the individual permit and other information requested by the Director shall
be signed by a person described above or by a duly authorized representative of that person. A
person is a duly authorized representative only if:
(1) The authorization is made in writing by a person described above;
(2) The authorization specified either an individual or a position having responsibility for the
overall operation of the regulated facility or activity, such as the position of plant
manager, operator of a well or well field, superintendent, a position of equivalent
Part III Page 3 of 8

Permit No. NCS000508
responsibility, or an individual or position having overall responsibility for environmental
matters for the company. (A duly authorized representative may thus be either a named
individual or any individual occupying a named position.); and
(3) The written authorization is submitted to the Director.
C. Any person signing a document under paragraphs a: or b. of this section shall make the following
certification:
"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. Based on my inquiry of the person or
persons who manage the system, or those persons directly respoFsible 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 fines and imprisonment for knowing violations."
4. Individual Permit Modification, -Revocation and Reissuance or Termination
The issuance of this individual permit does not prohibit the Director from reopening and modifying the
individual permit; revoking and reissuing the individual permit, or terminating the individual permit as
allowed by the laws, rules, and regulations contained in Title 40, Code of Federal Regulations, Parts 122
and 123; Title 15A of the North Carolina Administrative Code, Subchapter 21­1 .0100; and North Carolina
General Statute 143-215.1 et al.
Permit Actions
The permit may be modified, revoked and reissued, or terminated for cause. The notification of planned
changes or anticipated noncompliance does not stay any individual permit condition.
SECTION C: OPERATION AND MAINTENANCE OF POLLUTION CONTROLS
Proper Operation and Maintenance
The permittee shall at all times properly operate and maintain all facilities and systems of treatment and
control (and related appurtenances) which are installed or used by the permittee to achieve compliance with
the conditions of this individual permit. Proper operation and maintenance also includes adequate
laboratory controls and appropriate quality assurance procedures. This provision requires the operation of
back-up or auxiliary facilities or similar systems which are installed by a permittee only when the operation
is necessary to achieve compliance with the conditions of this individual permit.
2. Need to Halt or Reduce Not a Defense
It shell not be a defense for a permittee in an enforceient action that it would have been necessary to halt
or reduce the permitted activity in order to maintain compliance with the condition of this individual
permit. '
Bypassing of Stonnwater Control Facilities
Bypass is prohibited and the Director may take enforcement action against a permittee for bypass unless:
a. Bypass was unavoidable to prevent loss of life, personal injury or severe property damage; and
Part III Page 4 of 8

Permit No. NCS000508
b. There were no feasible alternatives to the bypass, such as the use of auxiliary control facilities,
retention of stormwater or maintenance during normal periods of equipment downtime or dry
weather. ,This condition is not satisfied if adequate backup controls should have been installed in
the exercise of reasonable engineering judgment to prevent a bypass which occurred during
normal periods of equipment downtime or preventive maintenance; and
C. The permittee submitted notices as required under, Part III, Section E of this permit.
If the Director determines that it will meet the Ihr¢:e conditions listed above, the Director may approve an
anticipated bypass after considering its adverse effi::ts.
SECTION D: MONITORING AND RECORDS.
Representative Sampling
Samples collected and measurements taken, as required herein, shall be characteristic of the volume and
nature of the permitted discharge. Analytical sampling shall be performed during a representative storm
event. Samples shall be taken on a day and time that is characteristic of the discharge. All outfall samples
shall be taken before the discharge joins or is diluted by any other waste stream, body of water, or
substance. Monitoring points as specified in this permit shall not be changed without notification to and
approval of the Director.
2. Recording Results "
For each measurement, sample, inspection or maintenance activity performed or collected pursuant to the
requirements of this individual permit, the permittee shall record the following information:
a. The date, exact place, and time of samplingonicasurements, inspection or maintenance activity;
b. - The individual(s) who performed the sampling, measurements, inspection or maintenance activity;
C. The date(s) analyses were performed;
.may
d. The individual(s) who performed the analyses;
e. The analytical techniques or methods used; and
f. The results of such analyses.
3. Flow Measurements
Where required, appropriate flow measurement devices and methods consistent with accepted scientific
practices shall be selected and used to ensure the accuracy and reliability of measurements of the volume of
monitored discharges.
4. Test Procedures
'test procedures for the analysis of pollutants shall conform to the EMC regulations published pursuant to
NCGS 143-215.63 et. seq, the Water and Air Quality Reporting Acts; and to regulations published pursuant
to Section 304(g), 33 USC 1314, of the Federal Water Pollution Control Act, as Amended, and Regulation
40 CPR 136.
PartIll Page 5 of 8

Permit No. NCS000508
To meet the intent of the monitoring required by this individual permit, all test procedures must produce
minimum detection and reporting levels and all data generated must be reported down to the minimum
detection or lower reporting level of the procedure.
5. Representative Outfall
If a facility has multiple discharge locations with substantially identical stormwater discharges that are
required to be sampled, the permittee may petition the Director for representative outfall status. If it is
established that the stormwater discharges are substantially identical and the permittee is granted
representative outfall status, then sampling requirements may be performed at a reduced number of outfalls.
6. Records Retention
Visual monitoring shall be documented and records maintained at the facility along with the Stormwater
Pollution Prevention Plan. Copies of analytical monitoring results shall also be maintained on -site. The
permittee shall retain records of all monitoring information, including all calibration and maintenance
records and all original strip chart recordings for continuous monitoring instrumentation, and copies of all
reports required by this individual permit for a period of at least 5 years from the dale of the sample,
measurement, report or application. This period may be extended by request of the Director at any time.
Inspection and Entry
The pennittee shall allow the Director, or an authorized representative (including an authorized contractor
acting as a representative of the Director), or in the case of a facility which discharges through a municipal
separate storm sewer system, an authorized representative of a municipal operator or the separate stomt
sewer system receiving the discharge, upon the presentation of credentials and other documents as may be
required by law, to;
a. $titer upon the permittee's premises where a regulated facility or activity is located or conducted,
or where records must be kept under the conditions of this individual permit;
I
b. 1<ave access to and copy, at reasonable times; any records that must be kept under the conditions
of this individual permit;
C. Inspect at reasonable times any facilities, equipment (including monitoring and control
equipment), practices, or operations regulated or required under this individual permit; and
d. Sample or monitor at reasonable times, for the purposes of assuring individual permit compliance
or as otherwise authorized by the Clean Water Act, any substances or parameters at any location.
SECTIONE: REPORTING REQUIREMENTS
I_ Discharge Monitoring Reports
Samples analyzed in accordance with the terms of this permit shall be submitted to the Division on
Discharge Monitoring Report forms provided by the Director. Submittals shall be delivered to the Division
no later than 30 days from the date the facility receives the sampling results from the laboratory.
The pennittee shall submit an Annual Summary Data Monitoring Report to the appropriate DWQ Regional
Office in February of each year. The submittal shall be on forms supplied by the Division.
Part III Page 6 of 8

Permit No. NCS000508
If no discharge has occurred from the facility during a monitoring period, the permittee is required to
submit a discharge monitoring report, within30 days of the end of the monitoring period', giving all
required information and indicating "NO FLOW" as per NCAC T15A 02B'.0506.
-r
The permittee shall record the required qualitative monitoring observations on the SDO Qtildlitstive
Monitoring Report form provided by the Division, and shall retain the completed forms on site. Visual
monitoring results should not be submitted to the Division, except upon D WQ's specific requirement to do
SO.
2. Submitting Reports
Two signed copies of Discharge Monitoring Reports (DMRs) shall be submitted to:
Central Files
Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
In addition, a separate signed Annual Summary DMR copy shall be submitted to the local DWQ Regional
Office (RO) by March 1 of each year.
Addresses for each RO and the counties covered by each RO can be found here:
htti):/IwwNv.enr.state.ne.tis/iitnilh-eizionaloffices.litml. The permittee shall retain the completed originals
on,site. Visual monitoring results should not be submitted to the Regional Offices or Central Files unless
specifically requested by DWQ. ,.
3. Availability of Reports
Except for data determined to be confidential under NCGS 143-215.3(a)(2) or Section 308 of the Federa6
Act, 33 USC 1318, all reports prepared in accordance with the terms shall be available for public inspection
at the offices of the Division of Water Quality. As required by the Act, analytical data shall not be
considered confidential. Knowingly making any false statement on any such report may result in the
imposition of criminal penalties as provided for in NCGS 143-215.6E or in Section 309 of the Federal Act.
4. , Non-Stormwater Discharges
If the storm event monitored.in accordance with this Individual Permit coincides with a non-stormwater
discharge, the-permittee shall separately monitor all parameters as required under the non-stormwater
discharge permit and provide this information with the stormwater discharge monitoring report.
Planned Changes
The permittee shall give notice to the Director as soon as possible of any planned changes at the pet•nitted
facility which could significantly alter the nature or quantity of pollutants discharged. This notification
requirement includes pollutants which are not specifically listed in the Individual Permit ors ubject to
notification requirements under 40 CFR Part 122.42 (a).
6. Anticipated Noncompliance
The permittee shall give notice to the Director as soon as possible of any planned changes at the permitted
facility which may result in noncompliance with the Individual Permit requirements.
PartIII Page 7 of 8

Permit No. NCS000508
Spills
The permittee shall report to the local DWQ Regional Office, within 24 hours, all significant spills as
defined in Part VI of this permit. Additionally, the permittee shall report spills including: any oil spill of 25
gallons or more, any spill regardless of amount that causes a sheen on surface waters, any oil spill
regardless of amount occurring within 100 feet of surface.waters, and any oil spill less than 25 gallons that
cannot be cleaned up within 24 hours.
Bypass
a. Anticipated bypass. If the permittee knows in advance of the need for a bypass, it shall submit
prior notice, if possible at least ten days before the date of the bypass; including an evaluation of
the anticipated quality and affect of the bypass.
b. Unanticipated bypass. The permittee shall submit notice within 24 hours of becoming aware of an
unanticipated bypass.
Twenty-four Hour Reporting
The permittee shall report to [lie central office or the appropriate regional office any noncompliance which
may endanger health or the environment. Any infonnation shall be provided orally within 24 hours from
the time the permittee became aware of the circumstances. �A written submission shall also be provided
within 5 days of the time the permittee becomes aware of the circumstances.
The written submission shall contain a description of the noncompliance, and its causes; the period of
noncompliance, including exact dates and times, and if the noncompliance has, not been corrected, the
anticipated time compliance is expected to continue', and steps taken or planned to reduce, eliminate, and
prevent reoccurrence of the noncompliance. -
The Director may waive the written report on a,case-by-case basis if the oral report has been received
within 24 hours:
10. Other Noncompliance
The permittee shall report all instances of noncompliance not reported under 24 hour reporting at the time
monitoring reports are submitted.
11. Other Information
Where the permittee becomes aware that it failed to submit any relevant facts in a Notice of Intent to be
covered under this Individual Permit or in any report to the Director, it shall promptly submit such facts or
information.
Part III Page 8 of 8

NCS000508
PART IV LIMITATIONS REOPENER I .
This individual permit shall be modified or alternative]y, revoked and reissued, to comply with any applicable
effluent guideline or water quality standard issued or approved under provisions of the Clean Water Act, if the
effluent guideline or water quality standard so issued.or approved:
a. Contains different conditions or is otherwise more stringent than any effluent limitation in the individual
permit; or
b. Controls any pollutant not limited in the individual permit.
The individual permit as modified or reissued under this partiP;raph shall'also contain any other requirements in the
Act then applicable.
f r
PART V ADMINISTERING AND COMPLIANCE MONITORING PEE
REQUIREMENTS
The permittee must pay the administering and compliance monitoring fee within 30 (thirty) days after being billed
by the Division. Failure to pay the fee in timely manner in accordance with 15A NCAC 2H .0105(b)(4) may cause
this Division to initiate action to revoke the Individual Permit.
PART VI DEFINITIONS
1. Act
See Clean Water Act.
Allowable Non-Stormwater Discharges
This permit regulates stormwater discharges. Non-stormwater discharges which shall be allowed in the
stormwater conveyance system are:
(a) All other discharges that are authorized by a non-stormwater NPDES permit.
(b) . Uncontaminated groundwater, foundation drains, air -conditioner condensate without added
chemicals, springs, discharges of uncontaminated potable water, waterline and fire hydrant
flushings, water from footing drains, flows from riparian habitats and wetlands.
(c) Discharges resulting from fire -fighting or fire -fighting training.
3. Best Management Practices (BMPs)
.Measures or practices used to reduce the amount of pollution entering surface waters. BMPs may take the
form of a process, activity, or physical structure. More information on BMPs can be found at:
littp:Hcfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm.
4. Bypass
A bypass is the known diversion of stormwater from any portion of a stormwater control facility including
the collection system, which is not a designed or established operating mode for the facility.
5. Bulk Storage of Liquid Products
Liquid raw materials, manufactured products, waste materials or by-products with a single above ground
storage container having a capacity of greater than 660 gallons or with multiple above ground storage
containers located in close proximity to each other having &total combined storage capacity of greater -Jinn
1,320 gallons.
Parts IV, V and VI Page 1 of

Permit No. NCS000508
6. Certificate of Coverage
The Certificate of Coverage (COC) is the cover sheet which accompanies the Individual Permit upon
issuance and lists the facility name, location, receiving stream, river basin, effective date of coverage under
the permit and is signed by the Director.
7. Clean Water Act
The Federal Water Pollution Control Act, also known as the Clean Water Act (CWA), as amended, 33 USC
1251, et. seq.
8. Division or DW
The Division of Water Quality, Department of Environment and NaturalResources.
9. Director
The Director of the Division of Water Quality, the permit issuing authority.
10. EMC
The North Carolina Environmental Management Commission.
it. Grab Sample
An individual sample collected instantaneously. Grab samples that will be analyzed (quantitatively or
qualitatively) must be taken within the first 30 minutes of discharge.
12. Hazardous Substance
Any substance designated under 40 CFR Part 116 pursuant to Section 311 of the Clean Water Act.
13. Landfill
A disposal facility or part of a disposal facility where waste is placed in or on land and which is not a land
treatment facility, a surface impoundment, an injection well, a hazardous waste long-term storage facility or
"a surface storage facility.
14. Municipal Separate Storm Sewer System
A stortnwater collection system within an incorporated area of local self-government such as a city or town.
15. No Exposure
A condition of no exposure means that all industrial materials and activities are protected by a storm
resistant shelter or acceptable storage containers to prevent exposure to rain, snow, snowmelt, or runoff.
.Industrial materials or activities include, but are not limited to, material handling equipment or activities,
industrial machinery, raw materials, intermediate products, by-products, final products, or waste products.
DWQ may grant a No Exposure Exclusion from NPDES Stormwater Permitting requirements only if a
facility complies with the terms and conditions described in 40 CFR § 122.26(g)
16. Notice of Intent
The state application fort which, when submitted to the Division, officially indicates the facility's notice of
intent to seek coverage under an Individual Permit.
17. Permittee
The owner or operator issued a certificate of coverage pursuant to this Individual Permit.
18. Poinr Source Discharge of Stormwater 1
r ' Any disc6mible, confined and discrete conveyance including, but not specifically limited to, any pipe,
ditch, channel, runnel, conduit, well, or discrete fissure from which Stormwater is or may be discharged to
waters of the state.
Part VI Page 2 of Pages

Permit No. NCS000508
19. Representative Storm Event _
A storm event that measures greater than 0.1 inches of rainfall. The dine between this storm event and the previous
storm event measuring greater than 0.1 inches must be at least 72 hours. A single storm event may have a period of
no precipitation of up to 10 hours. For example, if it rains but stops before producing any collectable discharge, a
sample, may be collected if the next rain producing a discharge begins within 10 hours,
26. Representative Outfall Status
When it is established that the discharge of stormwater runoff from a single outfall is representative of the
discharges at multiple outfalls, the DWQ may grant representative outfall status. Representative outfall
status allows the permittee to perform analytical monitoring at a reduced number of outfalls.
21. Secondary Containment
Spill containment for the contents of the single largest tank within the containment structure plus sufficient ,
freeboard to allow for.the 25-year, 24-hour storm event.
22. Section 313 Water Priority Chemical -
A chemical or chemical category which:
a. Is listed in 40 CPR 372.65.pursuant to Section 313 of Title III of the Superfund Amendments and
Reauthorization Act (SARA) of 1986, also titled the Emergency Planning and Community Right -
to -Know Act of 1986;
b. Is present at or above threshold levels at a facility subject to SARA title III, Section 313 reporting
requirements; and
C. Meets at least one of the following criteria: .
(1) Is listed in appendix D of 40 CPR part 122 on Table 11 (organic priority pollutants),,Table
III (certain metals, cyanides, and phenols) or Table IV (certain toxic --illutants-are
hazardous substances); t
(2) Is listed as a hazardous substance pursuant to section 311(b)(2)(A) of the CWA at 40
CPR 116.4; or
- - (3)- Is a pollutant for.which EPA has published acute or chronic water quality criteria. .
23. Severe Property Damage
Means substantial physical damage to property, damage to the control facilities which causes them to
become inoperable, or substantial and permanent loss of natural resources which can reasonably be
expected to occur in the absence of a bypass. Severe property damage does not mean economic loss caused
by delays in production.
24. Significant Materials
Includes, but is not limited to: raw materials; fuels; materials such as solvents, detergents, and plastic
pellets; finished materials such as metallic products; raw materials used in food processing or production;
hazardous substances designated under section 101(14) ofCERCLA; any chemical the facility is required
to report pursuant to section 313 of Title III of SARA; fertilizers; pesticides; and waste products such as "
ashes, slag and sludge that have the potential to be released with stormwater discharges.
25. Significant Spills
Includes, but is not limited to: releases of oil or hazardous substances in excess of reportable quantities
under section 311 of the Clean Water Act (Ref: 40 CFR 110.10 and CFR 117.21) or section 102 of
CERCLA (Ref 40 CFR 302.4).
26. Stormwater Discharge Outfall (SDO)
The point of departure of stormwater from a discernible, confined, or discrete conveyance, including but
not limited to, storm sewer pipes, drainage ditches, channels, spillways, or channelized collection areas,
from which stormwater flows directly or indirectly into waters of the State of North Carolina.
Part VI Page 3 of Pages

rl Ir�'iSSifW�r�"�[O111111MIN
i
27: Stormwater Runoff
The flow of water which results from precipitation and which occurs immediately following rainfall or as a
result of snowmelt.
28. Storn»vater Associated with Industrial Activit
The discharge from any point source which is used for collecting and conveying stormwater and which is
directly related to manufacturing, processing or raw material storage areas at an industrial site. Facilities
considered to be engaged in "industrial activities" include those activities defined in 40 CPR 122.26(b)(14).
The term does not include discharges froth facilities or activities excluded from the NPDLS program.
29. Stormwater Pollution Prevention Plan
A comprehensive site -specific plan which details measures and practices to reduce stormwater pollution
and is based on an evaluation of the pollution potential of the site.
30. Total Maximum Daily Load (TMDL)
TMDLs are written plans for attaining and maintaining water quality standards, in all seasons, for a specific
water body and pollutant. (A list of approved TMDLs for the state of North Carolina can be found at
littp://ii2o.enr.state.tic.us/tmdl/)
31. Toxic Pollutant
Any pollutant listed as toxic under Section 307(a)(1) of the Clean Water Act.
32. Vehicle Maintenance Activit
Vehicle rehabilitation, mechanical repairs, painting,.fueling, lubrication, vehicle cleaning operations, or
"" "•' airport de-icing operations.
K
33. Visible Sedimentation
Solid particulate matter, both mineral and organic, that has been or is being transported by water, air,
gravity, or ice from its site of origin whicb.can be seen with the unaided eye.
34. 25-year, 24 hour storm event
The maximum 24-hour precipitation event expected to be equaled or exceeded, on the average, once in 25
years. -
Part VI Page 4 of 5 Pages

Permit No. NCS000508
SUPPLEMENT TO MONITORING; CONTROLS AND LIMITATIONS FOR PERMITTED
DISCHARGES
SPECIAL CONDITIONS
ACUTE TOXICITY MONITORING De-icing Events (Outfalls 004, 006, 016A, 024, 026,
027, 030, 033)
The permittee shall conduct aciiie toxicity tests on discharges occurring from four (4) qualifying
de-icing events using protocols defined as definitive in E.P.A. Document EPA/600/4-90/027F
entitled "Methods for Measuring the Acute Toxicity of Effluents to Freshwater and Marine
Organisms." The monitoring shall be performed as a Ceriodaphnia dubia 24-hour static test.
The parameter code for this test is TAE313. All toxicity testing results required as part of this
permit condition will be entered on the Discharge Monitoring Report form for the month in
which it was performed, using the appropriate parameter code. Test results shall be sent to DWQ
in accordance with Part]II Section E #2. Submitting Reports.
Test data shall be complete and accurate and include all supporting chemical/pb �eir,al
measurements performed in association with the toxicity tests, as well as all dc`_e/respon.- d,'ta.
Total residual chlorine of the effluent toxica y sample must be measured and repor�1,4r: if chlorine
is employed,for disinfection of the waste stream.
Should any test data from either these monitoring requirements or tests performed by the North
Carolina Division of Water Quality indicate potential impacts to the receiving stream, this permit
may be re -opened and modified to include, alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival and appropriate environmental controls, shall constitute an invalid test
and will require immediate follow-up testing to be completed during the next qualified de-icing
event following the permittee's receipt of laboratory results.
Part V1 Page 5 of 5 Pages

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LEGEND
a R U B X C R B R S
-
••••••••••••••••••••••••••••••••••••
WATERSHED
(BREAKLINE)
D R R P R IV R R
%uw•reneuen I<•1111 weewlk
wvNIGnJn&w pawn NnGN�
DELINEATED WETLANDS
■
EXISTING INLET
•
EXISTING MANHOLE
------------------
EXISTING STORM SEWER
0
EXISTING OUTFALL
600 0 600
SCALE IN FEET
t