20071581 Ver 1_Approval Letter_20071221

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Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen H. Sullins, Director
Division of Water Quality
December 21, 2007
Mr. Knapp Brabble
Town of Plymouth
1069 Plymouth Airport Road
Plymouth, NC 27962
Re: Plymouth Municipal Airport Expansion, Washington County
DWQ #20071581; USACE Action ID. No. SAW-2007-03571-194
APPROVAL of 401 Water Quality Certification with Additional Conditions
Dear Mr. Brabble:
Attached hereto is a copy of Certification No. 3720 issued to Mr. Knapp Brabble and Town of Plymouth,
dated December 21, 2007. In addition, you should get any other federal, state or local permits before you
go ahead with your project including (but not limited to) Solid Waste, Sediment and Erosion Control,
Stormwater, Dam Safety, Non-discharge and Water Supply Watershed regulations.
If we can be of further assistance, do not hesitate to contact us.
Sincer y,
Coleen H. Sullins
CHS/cbk/ijm
Attachments: Certificate of Completion
cc: Becky Fox, EPA, 1307 Firefly Road, Whittier, NC 28789
U.S. Army Corps of Engineers, Washington Regulatory Field Office, Wilmington District, USACOE
Kyle Barnes, DWQ Washington Regional Office
DLR Washington Regional Office
File Copy
Central Files
Gregg Antemann, CWS, Inc., 550 Westinghouse Boulevard, Charlotte, NC 28273
Filename: 071581 PlymouthMunicipalAirportExpa nsion(Washington)401_IC
401 OversightlExpress Review Permits Unit
1650 Mail Service Center, Winston-Salem, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Winston-Salem, North Carolina 27604
Phone: [phone] FAX [phone] Internet: htto://h2o.enr.state.nc.us/ncwetlands
None Carolina
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An Equal OpportunitylAffirmative Action Employer- 50% Recycled110% Post Consumer Paper

Mr. Knapp Brabble and Town of Plymouth.
Page 2 of 6
December 21, 2007
NORTH CAROLINA 401 WATER QUALITY CERTIFICATION
THIS CERTIFICATION is issued in conformity with.the requirements of Section 401 Public Laws 92-
500 and 95-217 of the United States and subject to the North Carolina Division of Water Quality (DWQ)
Regulations in 15 NCAC 2H, Section .0500 to Mr. Knapp Brabble and Town of Plymouth, to fill or
otherwise impact 1.2 acres of 404/wetland and 788 linear feet of open water (ditches), to construct the
proposed Plymouth Municipal Airport expansion, which is located at 1069 Plymouth Airport Road, in
Plymouth, Washington County, North Carolina, pursuant to an application dated September 17, 2007 and
received by the DWQ on September 18, 2007 and by Public Notice by the U.S. Army Corps of Engineers
issued on the 2"d day of November of 2007 (received by DWQ on November 2, 2007).
The application and supporting documentation provides adequate assurance that the proposed work will
not result in a violation of applicable Water Quality Standards and discharge guidelines. Therefore, the
State of North Carolina certifies that this activity will not violate the applicable portions of Sections 301,
302, 303, 306, 307 of PL 92-500 and PL 95-217 if conducted in accordance with the application, the
supporting documentation, and conditions hereinafter set forth.
This approval is only valid for the purpose and design submitted in the application materials and as
described in the Public Notice. If the project is changed, prior to notification a new application for a new
Certification is required. If the property is sold, the new owner must be given a copy of the Certification
and approval letter and is thereby responsible for complying with all conditions of this Certification. Any
new owner must notify the Division and request the Certification be issued in their name. Should wetland
or stream fill be requested in the future, additional compensatory mitigation may be required as described
in 15A NCAC 2H .0506 (h) (6) and (7). If any plan revisions from the approved site plan result in a
change in stream or wetland impact or an increase in impervious surfaces, the DWQ shall be notified in
writing and a new application for 401 Certification may be required. For this approval to be valid,
compliance with the conditions listed below is required.
Conditions of Certification:
1. Impacts Approved
The following impacts are hereby approved as long as all of the other specific and general
conditions of this Certification (or Isolated Wetland Permit) are met. No other impacts to
wetlands, streams, and/or buffers, are approved including incidental impacts:
T e of Im act Amount A roved Units Plan Location or Reference
404/Wetland 1.2 (acres) A lication and Public Notice
Open Water (ditches) 788 (linear feet) Ap lication and Public Notice
Sediment and Erosion Control:
2. Erosion and sediment control practices must be in full compliance with all specifications
governing the proper design, installation and operation and maintenance of such Best
Management Practices in order to protect surface waters standards:
a. The erosion and sediment control measures for the project must be designed, installed,
operated, and maintained in accordance with the most recent version of the North Carolina
Sediment and Erosion Control Planning and Design Manual.
b. The design, installation, operation, and maintenance of the sediment and erosion control
measures must be such that they equal, or exceed, the requirements specified in the most

Mr. Knapp Brabble and Town of Plymouth.
Page 3 of 6
December 21, 2007
recent version of the North Carolina Sediment and Erosion Control Manual. The devices
shall be maintained on all construction sites, borrow sites, and waste pile (spoil) projects,
including contractor-owned or leased borrow pits associated with the project.
c. Sufficient materials required for stabilization and/or repair of erosion control measures and
stormwater routing and treatment shall be on site at all times.
3. No waste, spoil, solids, or fill of any kind shall occur in wetlands, waters, or riparian areas beyond
the footprint of the impacts depicted in the 404/401 Permit Application. All construction activities,
including the design, installation, operation, and maintenance of sediment and erosion control Best
Management Practices, shall be performed so that no violations of state water quality standards,
statutes, or rules occur;
4. Sediment and erosion control measures shall not be placed in wetlands or waters to the maximum
extent practicable. If placement of sediment and erosion control devices in wetlands and waters is
unavoidable, they shall be removed and the natural grade restored within six months of the date that
the Division of Land Resources has released the project;
5. Protective Fencing -The outside buffer, wetland or water boundary and along the construction
corridor within these boundaries approved under this authorization shall be clearly marked with
orange warning fencing (or similar high visibility material) for the areas that have been approved to
infringe within the buffer, wetland or water prior to any land disturbing activities;
Continuing Compliance:
6. Mr. Knapp Brabble and Town of Plymouth shall conduct construction activities in a manner
consistent with State water quality standards (including any requirements resulting from
compliance with section 303(d) of the Clean Water Act) and any other appropriate requirements
of State law and federal law. If the Division determines that such standards or laws are not being
met (including the failure to sustain a designated or achieved use) or that State or federal law is
being violated, or that further conditions are necessary to assure compliance, the Division may
reevaluate and modify this Certification to include conditions appropriate to assure compliance
with such standards and requirements in accordance with 15A NCAC 2H.0507(d). Before
modifying the Certification, the Division shall notify Mr. Knapp Brabble and Town of Plymouth,
and the US Army Corps of Engineers, provide public notice in accordance with 15A NCAC
2H.0503 and provide opportunity for public hearing in accordance with 15A NCAC 2H.0504.
Any new or revised conditions shall be provided to Mr. Knapp Brabble and Town of Plymouth in
writing, shall be provided to the United States Army Corps of Engineers for reference in any
Permit issued pursuant to Section 404 of the Clean Water Act, and shall also become conditions
of the 404 Permit for the project;
Mitigation:
7. Compensatory Mitigation Using Onsite Preservation and Offsite Restoration
Mitigation must be provided for the proposed impacts as specified in the table below. We
understand that you will be purchasing wetland credits at 2:1 from the Great Dismal Swamp
Restoration Bank. This method has been determined by the DWQ to be a suitable means to meet
the mitigation requirement.
T e of Im act Com ensato Miti ation Re aired River and Sub-basin Number
404/Wetland 2.4 (acres) Roanoke/03010107

Mr. Knapp Brabble and Town of Plymouth.
Page 4 of 6
December 21, 2007
8. Construction Stormwater Permit NCGO10000
Upon the approval of an Erosion and Sedimentation Control Plan issued by the Division of Land
Resources (DLR) or a DLR delegated local erosion and sedimentation control program, an
NPDES General stormwater permit (NCGO10000) administered by DWQ is automatically issued
to the project. This General Permit allows stormwater to be discharged during land disturbing
construction activities as stipulated by conditions in the permit. If your project is covered by this
permit [applicable to construction projects that disturb one (1) or more acres], full compliance
with permit conditions including the sedimentation control plan, self-monitoring, record keeping
and reporting requirements are required. A copy of this permit and monitoring report forms may
be found at http: //h2o. enr. state. nc. us/su/Forms Documents. htm. ;
9. Written Stormwater Management Plan (Final Plan Needed)
A final, written stormwater management plan (including a signed and notarized Operation and
Maintenance Agreement) shall be submitted to the 401 Oversight and Express Permitting Unit
(2321 Crabtree Blvd., Suite 250, Raleigh, NC, 27604) and the stormwater management plans
shall be approved in writing by this Office before the impacts specified in this Certification
occur. You have the option of using the Express Review Program for expedited approval of
these plans. If you propose to use the Express Review Program, remember to include the
appropriate fee with the plan. The stormwater management plan must include plans,
specifications, and worksheets for stormwater management facilities that are appropriate for the
surface water classification and designed to remove at least 85% TSS according to the most
recent version of the NC DENR Stormwater Best Management Practices Manual. These facilities
must be designed to treat the runoff from the entire project, unless otherwise explicitly approved
by the Division of Water Quality. Also, before any permanent building is occupied at the
subject site, the facilities (as approved by this Office) shall be constructed and operational,
and the stormwater management plan (as approved by this Office) shall be implemented.
The structural stormwater practices as approved by this Office as well as drainage patterns must
be maintained in perpetuity. No changes to the structural stormwater practices shall be made
without written authorization from the Division of Water Quality.
Additionally, in watersheds within one mile and draining to 303(d) listed waters, as well as
watersheds that are classified as nutrient sensitive waters (NSW), water supply waters (WS), trout
waters (Tr), high quality waters (HQW), and outstanding resource waters (ORW), the Division
shall require that extended detention wetlands, bio-retention areas, and ponds followed by
forested filter strips (designed according to latest version of the NCDENR Stormwater Best
Management Practices Manual) be constructed as part of the stormwater management plan when
asite-specific stormwater management plan is required.
Where a State Stormwater Permit (in accordance with 15 A NCAC 2H .1000) is required,
this permit may be considered to meet this condition.
10. Culvert Installation
All work in or adjacent to stream waters shall be conducted in a dry work area. Approved BMP
measures from the most current version of NCDOT Construction and Maintenance Activities manual
(http://www.ncdot.or doh/operations/BMP manual/download/BMP Manual.pdf)
such as sandbags, rock berms, cofferdams and other diversion structures shall be used to prevent
excavation in flowing water.

Mr. Knapp Brabble and Town of Plymouth.
Page 5 of 6
December 21, 2007
Culverts required for this project shall be installed in such a manner that the original stream profiles
are not altered. Existing stream dimensions (including the cross section dimensions, pattern, and
longitudinal profile) must be maintained above and below locations of each culvert. Culverts shall
be designed and installed to allow for aquatic life movement as well as to prevent head cutting of
the streams. If any of the existing pipes are or become perched, the appropriate stream grade shall
be re-established or, if the pipes installed in a perched manner, the pipes shall be removed and re-
installed correctly.
Culvert(s) shall not be installed in such a manner that will cause aggradation or erosion of the
stream up or down stream of the culvert(s). Existing stream dimensions (including the cross section
dimensions, pattern and longitudinal profile) shall be maintained above and below locations of each
culvert. Therefore, you must provide plans with adequate details that indicate that the current
stability of the stream will be maintained or enhanced. You must receive written approval from this
Office for the above plans before the culvert(s) is installed. Culvert(s) must be installed according
to approved plans.
Placement of culverts and other structures in waters, streams, and wetlands must be placed below
the elevation of the streambed by one foot for all culverts with a diameter greater than 48 inches,
and 20 percent of the culvert diameter for culverts having a diameter less than 48 inches, to allow
low flow passage of water and aquatic life. Design and placement of culverts and other structures
including temporary erosion control measures shall not be conducted in a manner that may result in
dis-equilibrium of wetlands or streambeds or banks, adjacent to or upstream and down stream of the
above structures. The applicant is required to provide evidence that the equilibrium shall be
maintained if requested in writing by DWQ.
The establishment of native, woody vegetation and other soft stream bank stabilization techniques
must be used where practicable instead of rip rap or other bank hardening methods. If rip-rap is
necessary, it shall not be placed in the stream bed, unless specifically approved by the Division of
Water Quality.
Installation of culverts in wetlands must ensure continuity of water movement and be designed to
adequately accommodate high water or flood conditions.
Upon completion of the project, the Applicant shall complete and return the enclosed "Certificate of
Completion" form to notify NCDWQ when all work included in the §401 Certification has been
completed. The responsible party shall complete the attached form and return it to the
401/Wetlands Unit of the NC Division of Water Quality upon completion of the project. Please
send photographs upstream and downstream of each culvert site to document correct installation
along with the Certificate of Completion form.
11. Deed Notifications
Deed notifications or similar mechanisms shall be placed on all retained jurisdictional wetlands,
waters and protective buffers in order to assure compliance for future wetland, water and buffer
impact. These mechanisms shall be put in place at the time of recording of the property, or of
individual lots, whichever is appropriate. A sample deed notification can be downloaded from
the 401/Wetlands Unit web site at http://h2o.enr.state.nc.us/ncwetlands. The text of the sample
deed notification may be modified as appropriate to suit to this project.

Mr. Knapp Brabble and Town of Plymouth.
Page 6 of 6
December 21, 2007
12. Certificate of Completion
Upon completion of all work approved within the 401 Water Quality Certification or applicable
Buffer Rules, and any subsequent modifications, the applicant is required to return the attached
certificate of completion to the 401 Oversight/Express Review Permitting Unit, North Carolina
Division of Water Quality, 1650 Mail Service Center, Raleigh, NC, 27699-1650.
Also, this approval to proceed with your proposed impacts or to conduct impacts to waters as
depicted in your application shall expire upon expiration of the 404 or CAMA Permit.
If this Certification is unacceptable to you, you have the right to an adjudicatory hearing upon written
request within sixty (60) days following receipt of this Certification. 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, 6714 Mail Service Center, Raleigh, N.C. 27699-6714. If
modifications are made to an original Certification, you have the right to an adjudicatory hearing on the
modifications upon written request within sixty (60) days following receipt of the Certification. Unless
such demands are made, this Certification shall be final and binding.
This the 21 S` day of D tuber 2007
DI ION F A QUALITY
Coleen H. Sullins
3720
CHS/cbk/ijm