HomeMy WebLinkAbout6013_GreenwayNorthMeckCDLF_20170411_LFGMitigationPlan_DIN27653
April 3, 2017
Ms. Jackie Drummond Solid Waste Section Division of Waste Management
North Carolina Department of Environment and Natural Resources 1646 Mail Service Center Raleigh, NC 27699-1646 Dear Jackie:
Subject: North Meck C&D Landfill – Permit 60-13 Greenway Waste Solutions of North Meck, LLC Landfill Gas Remediation Plan CEC Project 111-370.001
Civil & Environmental Consultants, Inc. (CEC), on behalf of Greenway Waste Solutions of North Meck, LLC (GWS), submits the attached Phase II of the Landfill Gas (LFG) Remediation Plan for the abovementioned facility for your review. The proposed Phase II LFG Migration Control System is designed to expand the Phase I system and add LFG Migration Control to portions of the Infill
Expansion Area. Expansion of the LFG from the Closed Phase 1 Area C&D landfill will be accomplished by installing six new extraction wells placed in the waste mass, connecting these wells to the existing blower and LFG collection system. The forecasted average depths of the new wells are 45 feet below grade, but
maybe adjusted in the field hydrogeological data and field conditions. The LFG system for the Infill Expansion Area will consist of one system covering the southern, western and eastern edges of the waste mass. The systems will consist of 22 extraction wells installed into the waste mass. The system will include condensate traps, below ground HDPE piping and
extraction blower. The layout of the systems (old and new), construction details and well information can be found in the included Landfill Gas Remediation Plan and Construction Drawings. These systems are part of the corrective actions that will be further detailed in the requested Assessment of Corrective Measures
report that we are currently preparing and will be sending to you within 180 days from February 17, 2017.
Ms. Jackie Drummond - NCDENR
CEC Project 111-370.0001 Page 2 April 3, 2017
I hope you find the information provided satisfactory for your review. If you have any questions or
comments, please feel free to contact me at (980) 237-0373. Sincerely,
CIVIL & ENVIRONMENTAL CONSULTANTS, INC.
Bruce Reilly, P.E. Scott L. Brown, P.E.
Senior Project Manager Vice President
Attachments
-i- Landfill Gas Mitigation System Expansion April 3, 2017
TABLE OF CONTENTS
1.0 INTRODUCTION..............................................................................................................1
2.0 SYSTEM PERFORMANCE.............................................................................................3
3.0 DESIGN CONSIDERATIONS .........................................................................................4
4.0 PERMITTING ...................................................................................................................5
APPENDICES
Appendix A – Construction Drawings Appendix B – Operation and Maintenance Plan
-1- Landfill Gas Mitigation System Expansion April 3, 2017
1.0 INTRODUCTION
North Meck C&D Landfill Facility (Facility) is operated by Greenway Waste Solutions at North
Meck, LLC (GWS) and currently operates under Solid Waste Facility Permit Number 60-13. The
Facility address is 15300 Holbrooks Road, Huntersville, North Carolina. The site is bound on the
west by private property owners, on the east by a Mecklenburg County property, the north by
Holbrooks Road, and on the south by the private property owners.
The Closed Phase I Area consists of the southern portion of the site and is generally bounded by
an unnamed tributary of Cane Creek to the north; private property to the east, south and west.
Waste placement in this disposal unit generally occurred during the years 1993 to 2002. The
disposal area is approximately 23.3 acres. It has been reported, that the eastern and southern areas
of the disposal unit are “ringed” with land-clearing debris approximately 30-40 feet wide and 20-
30 feet deep.
The second portion of the site includes the Infill Area that is bordered on the south by the unnamed
tributary of Cane Creek; to the north by property owned by the Town of Huntersville; to east by
property owned by Mecklenburg County; and to the west by private properties. Waste placement
in the Infill Area started in 2003 and is ongoing. The disposal area is approximately 44.9 total
acres.
Both the Closed Phase I and Infill areas are monitored for both landfill gas and groundwater
conditions. The Closed Phase I Area LFG monitoring system consists of 9-landfill gas monitoring
wells and an active LFG extraction system installed in 2014. The extraction system consists of
25-perimeter extraction wells and three in-waste extraction wells connected to a vacuum blower
system. The LFG system and wells are sampled monthly. Groundwater monitoring of the Closed
Phase I Area consists of 16 point-of-compliance wells and six sentinel wells. These groundwater
wells are sampled semi-annually in accordance with the approved Closed Phase I Area
Contamination Delineation Plan that was last issued March 2016.
-2- Landfill Gas Mitigation System Expansion April 3, 2017
Based on perimeter methane monitoring well readings and groundwater impacts, GWS
implemented an active LFG remediation action in December 2014. In this active remediation, 25
perimeter extraction wells and three in-waste extraction wells were installed in the Closed Phase I
Area and connected to a vacuum blower system. The active LFG system was installed and is being
operated in accordance with the Landfill Gas Remediation Plan submitted to NCDEQ in July 2014.
Operational records, methane monitoring well sample results, and the continuing presence of low
concentrations of volatile organic compounds (MW-5D) in the groundwater along the northeast
edge of the waste area will be addressed by expanding the existing LFG system by adding 6 new
wells to be installed as shown on the Construction Drawings in Appendix A.
The Infill Expansion Area had 11 methane-monitoring wells installed in 2016. Monitoring of these
wells started in 2016 and has shown increasing methane concentrations in most wells with the
maximum concentration of methane detected in MMW-11 at 23.7% methane and >100% LEL.
Additionally, one pair of point of compliance wells (MW-12/MW-12D) have concentrations of
regulated volatile organics (vinyl chloride) greater than the state-required maximum
concentrations. A limited number of Infill Area groundwater-monitoring wells located within the
property have also indicated concentrations of benzene and vinyl chloride greater than the required
groundwater standards. As discussed in the latest version of the Contaminant Delineation Plan for
the Infill Area, the linkage between groundwater contamination and landfill gas is well recognized.
CEC is planning to install a stand-alone active LFG system to address the increasing methane
concentrations and to remove the likely pathway between landfill gas and groundwater volatile
organic impacts.
The active LFG system for the Infill Area will include 16 extraction wells connected to a stand-
alone new vacuum blower system. The new blower system will be installed in an appropriate
location with a blower exhaust silencer to mitigate noise from the system. The complete
engineering design package including details on well locations and depths can be found in
Appendix A – Construction Drawings.
-3- Landfill Gas Mitigation System Expansion April 3, 2017
2.0 SYSTEM PERFORMANCE
After installation of the Closed Phase I Area modification and the Infill Area LFG system and their
respective start-ups, technicians will survey and adjust the performance of the systems
periodically. Methane monitoring well readings around the perimeter of the two areas will be
taken monthly to monitor the efficacy of the systems. The systems will be adjusted based on these
readings to improve system performance. After six months of continuous operation of the systems,
the sampling data from the perimeter monitoring wells will be analyzed and the overall
performance of each of the systems will be evaluated.
-4- Landfill Gas Mitigation System Expansion April 3, 2017
3.0 DESIGN CONSIDERATIONS
CEC designed the proposed LFG migration control systems based on existing information and
perimeter methane monitoring well data. The systems are designed to prevent off-site migration
of LFG to adjacent properties by extracting LFG from the waste mass with vertical wells as well
as cutting off the migration pathway with perimeter vertical extraction wells. All extraction wells
are connected to a High Density Polyethylene (HDPE) header piping systems that collects and
conveys the gas to one of the LFG blower skids. All piping in the system is above-ground unless
otherwise noted in the Construction Drawings. Condensate in the collection piping is designed to
flow into one of three “J” style condensate traps by gravity. The systems are designed with valves
in the header collection system as well as a wellhead valve at each of the extraction wells in order
to support balancing and tuning of the wellfield systems.
One design consideration for these systems was potential noise impacts from the blower skids on
adjacent property owners. The systems are designed to use the existing topography and buffers to
minimize any noise impacts. Specifically, the blower skids are placed with part of the landfill
between the blower skid and the nearest adjacent property owner. The blower skid site and the
landfill perimeter both offer buffers with trees and vegetation. Additionally, the blower skids are
equipped with an exhaust silencer.
It is not expected that the LFG migration control system will affect any existing facility operations
beyond the added routine operation and maintenance of the LFG migration control system.
-5- Landfill Gas Mitigation System Expansion April 3, 2017
4.0 PERMITTING
This Construction and Demolition (C&D) landfill currently operates under Solid Waste Facility
Permit Number 60-13. No federal, state or local air permitting requirements have been identified
for C&D landfills. The Facility is not expected to emit pollutants listed in Mecklenburg County
Air Pollution Control Ordinance (MCAPCO) 1.5211(d). No air permitting requirements have
been identified for the Facility; therefore, an air quality permit is not required.
APPENDIX A
CONSTRUCTION DRAWINGS
8
A
B
3
4
5
67
1
2
C
D
E
F
G
H
8
3
4
5
67
1
2
A B C D E F G H
DESCRIPTIONDATENO
REVISION RECORD
www.cecinc.com
1900 Center Park Drive - Suite A - Charlotte, NC 28217
Ph: 980.237.0373 · Fax: 980.237.0372
DATE:
DWG SCALE:
DRAWN BY:
CHECKED BY:
APPROVED BY:
PROJECT NO:
S
H
E
E
T
O
F
D
R
A
W
I
N
G
N
O
.
:
COVER SHEET
111-370.001
N.T.S.
MARCH 2017 CTH
NTB
SLB
1
6
C
0
0
0
GREENWAY WASTE SOLUTIONS
OF NORTH MECK, LLC
NORTH MECKLENBURG LANDFILL
HUNTERSVILLE, NC
R
a
l
e
i
g
h
Franklin AshevilleForest City Lenoir Boone ElkinClemmonsWinston-SalemGreensboro EdenRoxbor
o
E
d
e
n
t
o
n
W
i
l
l
i
a
m
s
t
o
n
G
r
e
e
n
v
i
l
l
e
W
a
s
h
i
n
g
t
o
n
N
e
w
B
e
r
n
G
o
l
d
s
b
o
r
o
W
i
l
s
o
n
Car
y
S
m
i
t
h
f
i
e
l
d
Fay
e
t
t
e
v
i
l
l
e
C
l
i
n
t
o
n
W
i
l
m
i
n
g
t
o
n
Pinehurst Charlotte SalisburyGastoniaKannapolisHickory
A
h
o
s
k
i
e
Rockingham
L
o
n
g
B
e
a
c
h
J
a
c
k
s
o
n
v
i
l
l
e
M
o
r
e
h
e
a
d
C
i
t
y
K
i
l
l
D
e
v
i
l
H
i
l
l
s
L
I
S
T
O
F
D
R
A
W
I
N
G
S
C
0
0
0
C
O
V
E
R
S
H
E
E
T
C
1
0
0
O
V
E
R
A
L
L
S
I
T
E
P
L
A
N
C
2
0
0
E
X
I
S
T
I
N
G
C
O
N
D
I
T
I
O
N
S
C
3
0
0
L
A
N
D
F
I
L
L
G
A
S
E
X
T
R
A
C
T
I
O
N
S
Y
S
T
E
M
C
4
0
0
D
E
T
A
I
L
S
C
4
0
1
D
E
T
A
I
L
S
NORTH
N
O
R
T
H
C
A
R
O
L
I
N
A
B
O
A
R
D
O
F
E
X
A
M
I
N
E
R
S
F
O
R
E
N
G
I
N
E
E
R
S
A
N
D
S
U
R
V
E
Y
O
R
S
L
I
C
E
N
S
E
N
O
.
C
-
3
0
3
5
8
A
B
3
4
5
67
1
2
C
D
E
F
G
H
8
3
4
5
67
1
2
A B C D E F G H
DESCRIPTIONDATENO
REVISION RECORD
www.cecinc.com
1900 Center Park Drive - Suite A - Charlotte, NC 28217
Ph: 980.237.0373 · Fax: 980.237.0372
DATE:
DWG SCALE:
DRAWN BY:
CHECKED BY:
APPROVED BY:
PROJECT NO:
S
H
E
E
T
O
F
D
R
A
W
I
N
G
N
O
.
:
OVERALL SITE PLAN
111-370.001
1"=200'
MARCH 2017 CTH
NTB
SLB
2
6
C
1
0
0
GREENWAY WASTE SOLUTIONS
OF NORTH MECK, LLC
NORTH MECKLENBURG LANDFILL
HUNTERSVILLE, NC
NORTH
N
O
R
T
H
C
A
R
O
L
I
N
A
B
O
A
R
D
O
F
E
X
A
M
I
N
E
R
S
F
O
R
E
N
G
I
N
E
E
R
S
A
N
D
S
U
R
V
E
Y
O
R
S
L
I
C
E
N
S
E
N
O
.
C
-
3
0
3
5
REFERENCE
8
A
B
3
4
5
67
1
2
C
D
E
F
G
H
8
3
4
5
67
1
2
A B C D E F G H
DESCRIPTIONDATENO
REVISION RECORD
www.cecinc.com
1900 Center Park Drive - Suite A - Charlotte, NC 28217
Ph: 980.237.0373 · Fax: 980.237.0372
DATE:
DWG SCALE:
DRAWN BY:
CHECKED BY:
APPROVED BY:
PROJECT NO:
S
H
E
E
T
O
F
D
R
A
W
I
N
G
N
O
.
:
EXISTING CONDITIONS
111-370.001
1"=200'
MARCH 2017 CTH
NTB
SLB
3
6
C
2
0
0
GREENWAY WASTE SOLUTIONS
OF NORTH MECK, LLC
NORTH MECKLENBURG LANDFILL
HUNTERSVILLE, NC
NORTH
N
O
R
T
H
C
A
R
O
L
I
N
A
B
O
A
R
D
O
F
E
X
A
M
I
N
E
R
S
F
O
R
E
N
G
I
N
E
E
R
S
A
N
D
S
U
R
V
E
Y
O
R
S
L
I
C
E
N
S
E
N
O
.
C
-
3
0
3
5
REFERENCE
8
A
B
3
4
5
67
1
2
C
D
E
F
G
H
8
3
4
5
67
1
2
A B C D E F G H
DESCRIPTIONDATENO
REVISION RECORD
www.cecinc.com
1900 Center Park Drive - Suite A - Charlotte, NC 28217
Ph: 980.237.0373 · Fax: 980.237.0372
DATE:
DWG SCALE:
DRAWN BY:
CHECKED BY:
APPROVED BY:
PROJECT NO:
S
H
E
E
T
O
F
D
R
A
W
I
N
G
N
O
.
:
LANDFILL GAS
EXTRACTION SYSTEM
111-370.001
1"=200'
MARCH 2017 CTH
NTB
SLB
3
6
C
3
0
0
GREENWAY WASTE SOLUTIONS
OF NORTH MECK, LLC
NORTH MECKLENBURG LANDFILL
HUNTERSVILLE, NC
NORTH
N
O
R
T
H
C
A
R
O
L
I
N
A
B
O
A
R
D
O
F
E
X
A
M
I
N
E
R
S
F
O
R
E
N
G
I
N
E
E
R
S
A
N
D
S
U
R
V
E
Y
O
R
S
L
I
C
E
N
S
E
N
O
.
C
-
3
0
3
5
REFERENCE
8
A
B
3
4
5
67
1
2
C
D
E
F
G
H
8
3
4
5
67
1
2
A B C D E F G H
DESCRIPTIONDATENO
REVISION RECORD
www.cecinc.com
1900 Center Park Drive - Suite A - Charlotte, NC 28217
Ph: 980.237.0373 · Fax: 980.237.0372
DATE:
DWG SCALE:
DRAWN BY:
CHECKED BY:
APPROVED BY:
PROJECT NO:
S
H
E
E
T
O
F
D
R
A
W
I
N
G
N
O
.
:
DETAILS
152-843
N.T.S.
MARCH 2017 CTH
NTB
SLB
5
6
C
4
0
0
GREENWAY WASTE SOLUTIONS
OF NORTH MECK, LLC
NORTH MECKLENBURG LANDFILL
HUNTERSVILLE, NC
N
O
R
T
H
C
A
R
O
L
I
N
A
B
O
A
R
D
O
F
E
X
A
M
I
N
E
R
S
F
O
R
E
N
G
I
N
E
E
R
S
A
N
D
S
U
R
V
E
Y
O
R
S
L
I
C
E
N
S
E
N
O
.
C
-
3
0
3
5
8
A
B
3
4
5
67
1
2
C
D
E
F
G
H
8
3
4
5
67
1
2
A B C D E F G H
DESCRIPTIONDATENO
REVISION RECORD
www.cecinc.com
1900 Center Park Drive - Suite A - Charlotte, NC 28217
Ph: 980.237.0373 · Fax: 980.237.0372
DATE:
DWG SCALE:
DRAWN BY:
CHECKED BY:
APPROVED BY:
PROJECT NO:
S
H
E
E
T
O
F
D
R
A
W
I
N
G
N
O
.
:
DETAILS
152-843
N.T.S.
MARCH 2017 CTH
NTB
SLB
6
6
C
4
0
1
GREENWAY WASTE SOLUTIONS
OF NORTH MECK, LLC
NORTH MECKLENBURG LANDFILL
HUNTERSVILLE, NC
N
O
R
T
H
C
A
R
O
L
I
N
A
B
O
A
R
D
O
F
E
X
A
M
I
N
E
R
S
F
O
R
E
N
G
I
N
E
E
R
S
A
N
D
S
U
R
V
E
Y
O
R
S
L
I
C
E
N
S
E
N
O
.
C
-
3
0
3
5
APPENDIX B
OPERATION AND MAINTENANCE PLAN
OPERATIONS AND MAINTENANCE PLAN LANDFILL GAS MIGRATION SYSTEM
NORTH MECK C&D LANDFILL FACILITY
PERMIT No. 60-13 PHASE 1/2 Prepared For: GREENWAY WASTE SOLUTIONS OF NORTH MECK, LLC Prepared By:
CIVIL & ENVIRONMENTAL CONSULTANTS, INC.
CHARLOTTE, NORTH CAROLINA
CEC Project 111-370.001 March 31, 2017
-i- Operation and Maintenance Plan March 31, 2017
TABLE OF CONTENTS
1.0 COMPONENT LIST .........................................................................................................1
2.0 SYSTEM OPERATION ....................................................................................................1
3.0 MAINTENANCE SCHEDULE ........................................................................................2
4.0 CONTINGENCY PLAN ...................................................................................................2
-1- Operation and Maintenance Plan March 31, 2017
1.0 COMPONENT LIST
The North Meck C&D Landfill active LFG extraction and migration system is comprised of
fifteen perimeter extraction wells and three in-waste extraction wells in Phase 1/2 connected to a
vacuum blower system. LFG will be extracted by vacuum from the waste mass and the
perimeter of the landfill and collected and conveyed by piping to a central blower skid. Below is
a list of system components:
Equipment Manufacturer Model Quantity
Existing Blower Rotron EN757 1
Blower TBD TBD 1
Wellhead Landtec Accuflow 40
Valves Asahi 6” Butterfly 4
Valves Asahi 8” Butterfly 6
2.0 SYSTEM OPERATION
The LFG migration control system is designed to be operated with minimal impact to existing
Facility Operations and with little maintenance. The blower and vent stack equipment is
provided with easy to use controls for manual startup and shutdown.
-2- Operation and Maintenance Plan March 31, 2017
3.0 MAINTENANCE SCHEDULE
4.0 CONTINGENCY PLAN
If there are problems with the LFG migration system, the Facility operator should contact the
wellfield operator to attempt to troubleshoot the problem. In the event that the blower system
shuts down or system troubleshooting is unsuccessful, the Facility operator will contact the
appropriate parties below for service:
Wellfield Operator:
Nathan Bivins, CEC 980-237-0373 (office)
Engineering Support:
Nathan Bivins, CEC 980-237-0373 (office)
Scott Brown, CEC 980-237-0373 (office)
-3- Operation and Maintenance Plan March 31, 2017
Existing Blower Operational Questions/Warranty Support:
Andy Murrer Construction Manager
AdvanceOneDevelopment, LLC
10600 Nations Ford Rd. Charlotte, NC 28273
The Operational and Engineering Support personnel above should be notified of any system
shutdown as soon as possible in order to minimize potential downtime of the LFG collection and
control measures for the Facility.