6013_GreenwayNorthMeckCDLF_20170420_LFGMitigationPlanResponse_DIN27654

April 20, 2017

Sent Via Email – [e-mail]

Mr. Mike Griffin
Greenway Waste Solutions at North Meck, LLC
19109 West Catawba Avenue, Suite 200
Cornelius, NC 28031

Re: Landfill Gas Mitigation System Expansion
North Mecklenburg C&D Landfill Infill Areas and Closed Phase I Area
Mecklenburg County
Solid Waste Permit Number 6013-CDLF
DIN 27654

Dear Mr. Griffin:

The NC Solid Waste Section has completed a review of the Landfill Gas Mitigation System Expansion plan
dated April 3, 2017 (DIN 27653), received via email on April 11, 2017, and submitted on your behalf by
CEC Consultants, Inc. for the North Mecklenburg C&D Landfill Infill Areas and the Closed Phase I Area, NC
Solid Waste Permit Number 6013-CDLF. Since 2013 in response to the consistent groundwater
exceedances, the Infill area of the landfill has been in the Assessment Monitoring Program in accordance
with 15A NCAC 13B .0545 and 15A NCAC 2L, and the closed Phase I area of the landfill has been conducting
an assessment in accordance with 15A NCAC 15A NCAC 13B .0503 and the 15A NCAC 2L.

In response to methane gas exceedances, Greenway Waste Solutions at North Meck, LLC installed a landfill
gas remediation system that has been in operation since 2015 at the Closed Phase I Area and is requesting
to expand the system. Six new extraction wells will be installed in the waste mass at about 45 feet below
grade. These new extraction wells will be connected to the existing blower and the landfill gas collection
system. In addition, 16 extraction wells will be installed into the waste mass in the Infill Areas in response
to methane gas exceedances. They will be connected to a stand alone new vacuum blower system and
include condensate traps and below ground HDPE piping. An Operations and Maintenance Plan is also
provided within the Landfill Gas Mitigation System Expansion plan.

After installation of the Closed Phase I Area modification and the Infill Area landfill gas system, methane
gas readings will be taken monthly to monitor the efficacy of the systems. Also, after six months of
continuous operation of the systems, the methane gas readings from the perimeter monitoring wells will
be analyzed and the overall performance of each of the systems will be evaluated.

Based upon the review of the Landfill Gas Mitigation System Expansion plan, the NC Solid Waste Section
approves the document as described. Please implement the Landfill Gas Mitigation System Expansion

plan within 30 days of receipt of this letter, and notify the NC Solid Waste Section if there are any
deviations to the plan.

If you have any questions or concerns regarding this letter, please feel free to contact me by phone at
828.296.4706 or by email at [e-mail]. Thank you for your continued cooperation
with this matter.

Sincerely,

Jaclynne Drummond
Compliance Hydrogeologist
Solid Waste Section, Division of Waste Management
NCDEQ

cc sent via email: Jason Watkins, Field Operations Branch Head
Deb Aja, Western District Supervisor
Teresa Bradford, Environmental Senior Specialist
Ed Mussler, Permitting Branch Head
Perry Sugg, Permitting Hydrogeologist
Larry Frost, Permitting Engineer
John Brown, Griffin Brothers
Ed Stephens, CEC, Inc.
Scott Brown, CEC, Inc.
Joe Hack, Mecklenburg County Solid Waste Management
Charles Dial, Mecklenburg County Solid Waste Management
Jack Simoneau, Town of Huntersville