NCC230512_ESC Approval Submitted_20230303

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Governor
ELIZABETH BISER
Secretary
DOUGLAS ANSEL
Interim Director NORTH CAROLiNA
Environmental Quality
December 22, 2022
LETTER OF APPROVAL WITH MODIFICATIONS
Boom Technology, Inc.
Attention: Richard Harris, Chief Legal Officer
12876 E Adam Aircraft Circle
Centennial, CO 80112
RE: Project Name: Boom Supersonic — Final Assembly Line (FAL)
Project ID: GUILF-2023-020
Acres Approved: 28.5
County: Guilford
City: Greensboro
Address: Piedmont Triad International Airport
River Basin: Cape Fear
Stream Classification: WS-IV;
Submitted By: Parrish & Partners
Date Received by LQS: November 23, 2022
Plan Type: New
Dear Richard Harris:
This office has reviewed the subject erosion and sedimentation control plan. We find the plan to be
acceptable with modifications and hereby issue this letter of Approval with Modifications. The
modifications required for approval are listed on the attached page. This plan approval shall expire three
(3) years following the date of approval, if no land -disturbing activity has been undertaken, as is
required by Title 15A NCAC 4B .0129.
As of April 1, 2019, all new construction activities are required to complete and submit an electronic
Notice of Intent (eNOI) form requesting a Certificate of Coverage (COC) under the NCG010000
Construction General Permit. After the form is reviewed and found to be complete, you will receive a
link with payment instructions for the $100 annual permit fee. After the fee is processed, you will
receive the COC via email. As the Financially Responsible Party shown on the FRO form submitted for
this project, you MUST obtain the COC prior to commencement of any land disturbing
activity. The eNOI form may be accessed at deq.nc.gov/NCGO1. Please direct questions about
the eNOI form to the Stormwater Program staff in the Raleigh central office. If the owner/operator of
this project changes in the future, the new responsible party must obtain a new COC.
Title 15A NCAC 4B .0118(a) and the NCGO10000 permit require that the following documentation be
kept on file at the job site:
North Carolina Department of Environmental Quality I Division of Energy, Mineral, and Land Resources
` Winston-Salem Regional Office 1450 Hanes Mill Road, Suite 300 I Winston-Salem, North Carolina 27105
336-776-9800

Letter of Approval with Modifications
Boom Technology, Inc.
December 22, 2022
Page 2 of 3
1. The approved E&SC plan as well as any approved deviation.
2. The NCGOI permit and the COC, once it is received.
3. Records of inspections made during the previous 12 months.
Also, this letter gives the notice required by G.S. 113A-61.1(a) of our right of periodic inspection to
insure compliance with the approved plan.
North Carolina's Sedimentation Pollution Control Act is performance -oriented, requiring protection of
existing natural resources and adjoining properties. If, following the commencement of this project, it is
determined that the erosion and sedimentation control plan is inadequate to meet the requirements of the
Sedimentation Pollution Control Act of 1973 (North Carolina General Statute 113A-51 through 66), this
office may require revisions to the plan and implementation of the revisions to ensure compliance with
the Act.
Acceptance and approval of this plan is conditioned upon your compliance with Federal and State water
quality laws, regulations, and rules. In addition, local city or county ordinances or rules may also apply
to this land -disturbing activity. This approval does not supersede any other permit or approval.
Please note that this approval is based in part on the accuracy of the information provided in the
Financial Responsibility Form, which you provided. You are requested to file an amended form if there
is any change in the information included on the form. In addition, it would be helpful if you notify this
office of the proposed starting date for this project.
Your cooperation is appreciated.
Sincerely,
Tamera Ep n, PE
Regional Engineer
Land Quality Section
Enclosures: Certificate of Approval
Modifications Required for Approval
Timothy Gruebel, PE[[e-mail]]

Letter of Approval with Modifications
Boom Technology, Inc.
December 22, 2022
Page 3 of 3
MODIFICATIONS REQUIRED FOR APPROVAL
Project Name: Boom Supersonic — Final Assembly Line (FAL)
Project ID: GUILF-2023-020
County: Guilford
Modifications pursuant to applicable North Carolina General Statutes and/or Regulations:
1. This project requires coordination with the erosion control plan GUILF-2019-013 under
construction by the airport. The associated sediment basins must not be closed or converted until
this project is complete and the land stabilized. [15A NCAC 413.0112]
2. If it is found additional area will be required for stockpiling of topsoil, contractor staging,
temporary access, haul roads, erosion control measures or other land -disturbing activities
associated with this project, a revised erosion control plan reflecting the additional area must be
submitted to this office. [I 5A NCAC 4B .0118]
3. Erosion control measures must be maintained in accordance with the North Carolina Erosion and
Sediment Control Planning and Design Manual. [G.S. I I3A-57(3)]
4. Any off -site borrow and waste required for this project must come from a site with an approved
erosion control plan, a site regulated under the Mining Act of 1971, or a landfill regulated by the
Division of Solid Waste Management. Trash/debris from demolition activities or generated by
any activities on site must be disposed of at a facility regulated by the Division of Solid Waste
Management or per Division of Solid Waste Management or Division of Water Resources rules
and regulations. [I 5A NCAC 4B .0110]
5. Additional measures may be required - The applicant is responsible for the control of sediment
on -site. If the approved erosion and sedimentation control measures prove insufficient, the
applicant must take those additional steps necessary to stop sediment from leaving this site. [15A
NCAC 4B .0115]
6. The NCGO 1 has a $100 yearly fee and our office often receives closure inspection requests days
prior to yearly NCGOI fee payment due dates. Be advised the project requires a closure
inspection report by DEMLR prior to filing the Notice of Termination (NOT) to terminate NCGO1
coverage. The closure inspection should not be requested until after the site has achieved full
vegetative stabilization and measures have been removed. The removal of temporary ESC
measures, including basins, requires prior approval. Often, a full growing season is necessary
between initial seeding/mulching and removal of measures. Please plan your construction
accordingly to avoid contacting our office prematurely for a closure inspection. Also be advised
you may be asked for representative site pictures prior to a closure inspection. [General
Comment]
Ref: G.S. 113A-54.1 through G.S. 113A-57
Sections 15A NCAC 04A.0101 through 15A NCAC 04E.0504
General Permit NCG 010000 NPDES for Construction Activities

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