4116_Guilford_WI_GFL_HighPoint_CDLF_LFGUpdate_FID1646176_20220223

DocuSign Envelope ID: 87FC45A5-DE93-4AB0-8D90-8B4364B1C9F4
GFLG.... FOR LIFE
enr+ronmensaI
February 23, 2022
Ms. Jaclynne Drummond, Hydrogeologist
Department of Environmental Quality, Division of Waste Management, Solid Waste Section
2090 US Highway 70
Swannanoa, North Carolina 28778
Jaclynne.drummondldncdenr.gov
RE: Landfill Gas Remediation System Update Report
WI High Point EGO Landfill (Permit No.41-16)
High Point, North Carolina
Dear Ms. Drummond,
GFL Environmental, Inc. is submitting the enclosed update of the Landfill Gas Remediation work
that has been completed to date along with our conclusions and recommendations based on
monitoring and investigations.
Should you have any questions, comments, or require further clarification, please contact me at
ioseph.santan-eq loldgflenv.com.
Sincerely,
GFL Environmental, Inc.
EDocuSigned by:
bstfL Sad
5FA73EA50BDC45A...
Joseph Santangelo
Regional Environmental Compliance Manager
Cc: Seth Heath (GFL Environmental, Inc.)
Bryan Wuester (GFL Environmental, Inc.)
W. Michael Brinchek, P.E. (Smith Gardner, Inc.)
Joan A. Smuth, P.G. (Smith Gardner, Inc.)

DocuSign Envelope ID: 87FC45A5-DE93-4AB0-8D90-8B4364B1C9F4
SMITH{ GARDNER
ENGINEERS
February 23, 2022
Mr. Joseph Santangelo
Regional Environmental Compliance Manager
GFL Environmental Inc.
1192 McClellandtown Road
McClellandtown, Pennsylvania 15458
ABBRESS TEL WEB
14 N. Boylan Avenue, Raleigh NC 27603 919.828.0577 www.smithgardnerinc.com
RE: Landfill Gas Remediation System Update Report
WI High Point CGO Landfill (Permit No.41-16)
High Point, North Carolina
Dear Mr. Santangelo:
Smith Gardner, Inc. (S+G) is pleased to submit this update regarding remediation of landfill
gas exceedances near the property boundary at the WI High Point C&D Landfill (Permit No.
41-16). Remedial actions taken to date include:
• Initial landfill gas (LFG) Vent Trench Installation — July 2021; and
• Additional Investigation/Trench Installation -September 2021
Details of these actions were summarized in the Landfill Gas Remediation System
Construction and Update Report'. In this report, S+G also proposed the installation of a new
LFG probe (IP-1I located between the landfill unit and existing LFG probes LFG-2 and LFG-
2A. This probe was installed to evaluate LFG concentrations in the subsurface closer to the
landfill to determine if the source of exceedances in LFG-2A was the C&D landfill unit.
A map depicting the installed remediation system and IP-1 is included as Figure 1.
INSTALLATION OF IP-1
LFG probe IP-1 was installed on December 17, 2021, by Geologic Exploration, Inc., under S+G
oversight. The probe was drilled to a depth of 17 feet and was constructed with 15 feet of 10-
slot screen. The well was completed with an approximate three-foot above grade steel
Locking casing. The location of this probe is shown on Figure 1 and a boring log is included in
Appendix A.
LFG MONITORING
Since the installation of the vent trenches, LFG monitoring has been conducted at least
monthly at the site. Water level monitoring in each probe in the area has also been
conducted routinely. LFG monitoring data since September 2021 are summarized in Table 1,
while water level measurements in each LFG probe are summarized in Table 2, supplied by
WSP Golder.
' Landfill Gas Remediation System Construction and Update Report, Smith Gardner, Inc., November 4,
2021

DocuSign Envelope ID: 87FC45A5-DE93-4AB0-8D90-8B4364B1C9F4
Mr. Joseph Santangelo
February 23, 2022
Page 2 of 3
LFG-2A
Probe LFG-2A is located near the property line. This probe has consistently exhibited
elevated methane concentrations since its installation during monthly monitoring. During
periods of extended dry weather, methane concentrations decreased, but have always
increased rapidly after rain events. Since September 2021, water level measurements have
been collected intermittently. While this well has exhibited water within the well, the
exposed screen length ranges from approximately 14 to 15 feet thick, yielding ample
screened interval for landfill gas migration/detection.
Vent Trenches
Three vent trenches have been installed as part of this investigation (Eastern, Central and
Western). The Eastern trench initially exhibited LFG above the Lower Explosive Limit (LEL),
but concentrations and venting have been sporadic and inconsistent. The remaining two vent
trenches have had little to no LFG present since installation. In general, the eastern vent has
remained free of water, while the central and western vents have exhibited water. The
central and western vents typically have open screened intervals ranging from 2 to 6 feet
thick.
LFG-2
This probe was the original monitoring probe in this area, which was replaced since it was
consistently watered in. Modifications to drainage in this area of the site have made
improvements in the reliability of this well. Since September, this well has had between 5.5
and 11.5 feet of exposed screen thickness. During these events no LFG has been detected in
this well.
/P-/
Probe IP-1 has been monitored on a weekly basis for four weeks. During that time, this
probe has had no detectable concentrations of methane. Water level monitoring indicates
this well has approximately 6-feet of exposed screen and the data is representative of
subsurface conditions around the C&D landfill unit.
CONCLUSIONS
Based on the information presented above, we make the following conclusions:
1. Due to drainage improvements, probe LFG-2 is now a viable LFG monitoring location.
2. The vent trenches rarely exhibit detectable methane concentrations, indicating that
LFG is not generally present within them or around them.
3. Concentrations of methane in LFG-2A are representative of a relatively limited area
Likely from an alternate source (not the landfill) in the vicinity of this probe, potentially
from the adjacent property.
4. The C&D landfill unit is not generating sufficient LFG to cause detectable methane
concentrations in the subsurface at IP-1 located approximately 75 feet from the edge
of waste.

DocuSign Envelope ID: 87FC45A5-DE93-4AB0-8D90-8B4364B1C9F4
Mr. Joseph Santangelo
February 23, 2022
Page 3 of 3
RECOMMENDATIONS
Based on these conclusions we make the following recommendations:
1. LFG-2 should replace LFG-2A as the perimeter monitoring location. This is in
keeping with the original LFG Monitoring Plan.
2. IP-1 should remain in place, but not be included in the perimeter monitoring network.
3. Since the landfill unit is not the source of methane concentrations detected in LFG-
2A, as shown by the vent trenches, LFG-2 and IP-1, and because methane
concentrations at LFG-2 have been below the LEL for at least three events, the site
should return to quarterly LFG monitoring.
4. Since the methane detected in LFG-2A is localized, we recommend the excavation of
LFG-2A and its immediate surrounding area to determine if woody waste interred in
the berm may be the source and to remove any potential methane source material
(woody debris, etc.).
5. A report on the investigation in the area of LFG-2A should be provided to NCDEQ.
Should you have any questions or require clarification, please contact us at [phone] or
by email below.
Sincerely,
SMITH GARDNER, INC.
DocuSigned by: ,¢.,m
358C21E64007440...
C
5EAL2/'3/20
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' 028426
W. Michael Brinchek, P.E. ''+,xi`AJE L��w.•`�
Senior Engineer '+"��+++++�+'*+•
mike(dsmithaardnerinc.com
Attachments
DocuSigned by: SS E A 2/ 2 3
I-4B9779EBA711F488...
`S' 1369 'C1
Joan A. Smyth, P.G. �,9�Ol0G�
Senior Hydrogeologist,,,A��
ioan(dsmithaardnerinc.com

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Figures

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DocuSign Envelope ID: 87FC45A5-DE93-4ABO-8D90-8B4364B1C9F4
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LEGEND
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TRENCH LOCATION
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2018 BY GEODATA CORPORATION, ZEBULON, NC WITH FIELD SURVEYS
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2. FACILITY PROPERTY LINE REFERENCE: SURVEY BY MARK TERRY AND
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ASSOCIATES, INC., DATED MAY 15, 2001.
3. MONITORING LOCATIONS AND SPRINGHEAD LOCATIONS FROM DRAWING
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DocuSign Envelope ID: 87FC45A5-DE93-4AB0-8D90-8B4364B1C9F4
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DocuSign Envelope ID: 87FC45A5-DE93-4AB0-8D90-8B4364B1C9F4
Tables

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DocuSign Envelope ID: 87FC45A5-DE93-4AB0-8D90-8B4364B1C9F4
February 2022
2013788121
Table 1
Summary of Landfill Gas Data
High Point C&D Landfill, Permit No. 41-16
Guilford County, NC
Barometric
LFG-1
LFG-2
LFG-2A
LFG-3
LFG-4
LFG-5
IP-1
Eastern Vent
Central Vent
Western Vent
Date
Presure (in)
CH4
CO2
02
CH4
CO2
02
CH4
CO2
02
CH4
CO2
02
CH4
CO2
02
CH4
CO2
02
CH4 CO2
02
CH4
CO2
02
CH4
CO2
02
CH4
CO2
02
10/20/20
29.25
0.0
0.6
19.7
--
--
--
0.0
5.7
16.8
0.0
3.8
18.8
0.0
0.8
19.9
0.0
5.5
16.2
-- --
--
--
--
--
--
--
--
--
--
--
01/19/21
29.24
0.0
6.4
19.1
0.0
3.2
19.5
13.0
7.9
16.7
0.0
5.4
18.9
0.0
0.2
20.8
0.0
5.6
17.5
-- --
--
--
--
--
--
--
--
--
--
--
05/26/21
29.15
0.0
0.1
19.4
0.0
3.7
17.5
58.9
37.2
0.5
0.0
0.0
20.1
0.0
0.0
19.9
0.0
2.5
17.1
-- --
--
--
--
--
--
--
--
--
--
--
07/15/21
29.19
0.0
0.0
19.5
0.0
0.6
18.9
34.5
24.8
6.5
0.0
0.2
19.6
0.0
0.0
20.0
0.0
3.1
17.5
-- --
--
--
--
--
--
--
--
--
--
--
08/02/21
29.07
0.0
0.0
20.0
0.1
1.2
19.7
10.3
9.7
14.4
0.1
7.4
15.3
0.1
0.1
20.9
0.2
2.9
17.7
-- --
--
0.2
0.2
20.5
--
--
--
--
--
--
09/20/21
29.22
0.0
0.1
19.9
0.0
2.8
17.7
1.2
2.9
16.9
0.0
9.1
15.0
0.0
0.0
20.1
0.0
3.2
17.0
-- --
--
1.8
3.1
17.8
0.5
0.9
18.1
0.7
1.9
17.0
10/21 /21
29.15
0.0
0.2
19.8
0.0
1.2
18.8
35.9
34.4
1.2
0.0
7.3
15.0
0.0
0.2
20.2
0.0
3.5
17.1
-- --
--
0.3
0.9
20.2
0.1
2.4
18.9
0.1
0.1
20.7
11/18/21
29.12
0.0
0.5
20.3
0.1
1.0
20.0
15.9
27.4
0.4
0.0
5.8
16.4
0.0
0.3
20.3
0.0
3.6
17.6
-- --
--
0.5
5.5
16.2
0.1
0.9
19.6
0.0
0.4
20.4
12/15/21
29.45
0.0
2.7
20.0
0.0
3.1
18.5
0.0
4.3
16.5
0.0
5.0
17.8
0.0
0.6
20.3
0.1
2.3
19.2
-- --
--
0.1
11.5
8.7
0.0
1.9
18.3
0.0
0.5
20.1
01 /26/22
29.31
0.0
0.1
20.1
0.0
1.9
18.8
14.9
26.9
0.1
0.0
3.4
18.7
0.0
0.5
20.4
0.0
2.1
19.8
0.0 0.0
20.5
0.0
1.0
20.0
0.0
0.9
20.1
0.0
0.2
20.5
02/08/22
29.14
0.0
0.1
20.2
0.0
3.0
18.3
37.9
30.0
1.0
0.0
2.8
18.8
0.0
0.4
20.6
0.0
2..2
19.4
0.0 0.4
20.0
0.0
4.8
15.1
0.0
0.1
20.3
0.0
0.1
20.4
Notes:
CH4 = methane
CO2 = carbon dioxide
02 = oxygen
--- = not available
= above the lower explosive limit
Gas concentrations are shown in percent by volume.
G0LDER
*> MEMBER OF WSP
Page 1 of 1

DocuSign Envelope ID: 87FC45A5-DE93-4AB0-8D90-8B4364B1C9F4
February 2022
2013788121.801
Table 2
Summary of Water Levels in Gas Monitoring Probes and Vents
High Point C&D Landfill, Permit No. 41-16
Guilford County, NC
LFG-2
LFG-2A
IP-1
Eastern Vent
Central Vent
Western Vent
Exposed
Exposed
Exposed
Exposed
Exposed
Exposed
Date
DTW (ft)
Screen (ft)
DTW (ft)
Screen (ft)
DTW (ft) Screen (ft)
DTW (ft)
Screen (ft)
DTW (ft)
Screen (ft)
DTW (ft)
Screen (ft)
10/21/21
11.72
6.72
--
--
-- --
DRY
2.00
14.73
4.73
11.47
1.47
11/18/21
11.94
6.94
14.93
9.93
-- --
DRY
2.00
15.26
5.26
13.59
3.59
12/15/21
12.97
7.97
15.57
10.57
-- --
DRY
2.00
16.10
6.10
14.39
4.39
01/26/22
11.24
6.24
14.69
9.69
11.05 6.05
DRY
2.00
16.01
6.01
14.12
4.12
02/08/22
10.64
5.64
13.50
8.50
-- --
DRY
2.00
14.48
4.48
14.19
4.19
Notes:
DTW = depth to water
ft = feet
WCT = water column thickness
gal = gallons
DRY = no water measured
The length of exposed screen exposed is considered approximate.
G0LDER
I*> MEMBER OF WSP
1 of 1

DocuSign Envelope ID: 87FC45A5-DE93-4AB0-8D90-8B4364B1C9F4
Appendix A

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DocuSign Envelope ID: 87FC45A5-DE93-4AB0-8D90-8B4364B1C9F4
Client: GFL, Inc.
Project Number., WIHIPOINT-21-1 ILoggedBy. SCR
SMITH GA R D N E R
BORING ID: IP-1
Site Location: 5830 Riverdale Dr Jamestown NC 27282
Boring Location: 35.952605,-79.922873
Sheet: 1 of 1
Drilling Method: 4.25" Hollow Stem Augers
Monitoring Well Installed: YES
Sam le T e s : N/A
I Boring Diameter., 8 inches
Screened Interval: 2-17'
Weather., Cool and Overcast
Ground Elevation: —799
Date Started: 12117/21
Depth of Boring., 17'
Drilling Contractor: Geologic Ex orations
TOC Elevation: NA
I Date Finished' 12117121
Water Level. NA
a
2
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MATERIALS: Color, size, range, MAIN COMPONENT, minor component(s),
t
a
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m
m
£
a
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m
ti
v?
moisture content, structure, angularity, maximum grain size, odor, and Geologic
Monitoring Well Construction
o
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d
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p
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Unit (if Known)
Details
rN
J
m
=
1
2
NA
no
0-5': Brown, silty clayey sand, dry.
3
4
5
6
7
NA
no
5-9': Beige, sandy silt with clay, dry.
8
9
9': Increased drillriq chatter
10
11
12
NA
no
9-17': Beige, silt with lithic fraqments, dry.
13
14
15
16
17
NA
no
17': Auger Refusal.
18
19
20
Date
Time
Depth to group
water w i e drInIng
NOTES:
Checked by Date: