4116_Guilford_WI_GFL_HighPoint_CDLF_LFGPlan_FID1624039_20211104

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
SMITH, GARDNER
ENGINEER
November 4, 2021
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.smithgaidnerinc.com
RE: Landfill Gas Remediation System Construction Record and 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 documentation of the construction activities
performed in accordance with the Landfill Gas Remediation Plan' for remediation of landfill
gas exceedances near the property boundary at the WI High Point C&D Landfill (Permit No.
41-16). This plan was approved2 by the NCDEQ on August 2, 2021. The plan was prepared
following initial investigation into the source of landfill gas (LFG) and excavation of a 125-
foot-long trench in the area. Work completed to date has consisted of the following:
removal of the organic matter encountered during the trench excavation;
installation of a fabric -wrapped 2-foot-deep gravel column and perforated PVC
stand -pipe within the trench to vent subsurface gas; and
grading of the area between perimeter berm and reclamation pad to promote
drainage.
All remedial actions taken to date are summarized below. A map depicting the installed
remediation system LFG remedial action is included as Figure 1 and photographic
documentation of the project is provided in Attachment A.
After the initial work was completed, LFG concentrations in LFG-2A decreased temporarily,
but failed to sufficiently abate and additional investigation and remedial actions were
performed, without significant finding. As a result, additional remedial actions are
recommended for continued assessment and remediation.
INITIAL LFG VENTTRENCH INSTALLATION
On July 21, 2021 Baxter Johnson Construction (BJC) regraded the area immediately adjacent
to LFG-2 to promote stormwater run-off from the area to the east and alleviate ponding of
stormwater.
BJC also excavated an approximately 125-foot-long trench along the perimeter site berm
from LFG-2 to the east to allow S+G to inspect the subsurface conditions. BJCs excavation
found that the perimeter berm was constructed using competent fill material; however
' Landfill Gas Remediation Plan WI High Point C&D Landfill, Smith Gardner, Inc., July 26, 2021
2 Letter from Ms. Jaclynne Drummond NCDEQ to Mr. Seth Heath of GFL Environmental, August 2, 2021

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
Mr. Joseph Santangelo
November 4, 2021
Page 2 of 3
woody debris was found buried deeper below the berm. During excavation a strong odor was
detected, indicating the presence of gas. A gravel column and perforated vent pipe were
installed in the trench to vent the gas. Monitoring of LFG-2A after the trench installation did
not indicate a reduction in LFG concentrations.
During a meeting on August 23, 2021, it was decided by site personnel that three additional
test pits should be excavated within the berm and one additional test pit should be excavated
near the reclamation pad to further assess the LFG and potential sources in this area. This
work is described below.
ADDITIONAL INVESTIGATION AND LANDFILL GAS VENT TRENCH INSTALLATION
Between September 9, 2021 and September 13, 2021, Golder Associates NC, Inc. (Golder)
performed additional investigation into the source of the LFG in this area. This included the
excavation of three test pits adjacent to and west of LFG-2/2A, and an additional test pit near
the northwest corner of the reclamation area.
Test pit excavation did not indicate significant organic material below grade. The test pits
were left open overnight to further evaluate LFG in the area. The next day measured LFG
concentrations in monitoring well LFG-2A had reduced by approximately 20% from 51.7% to
29.9%. Based on this information, two of the test pits were deepened to a depth of 10.5 feet
and a total of six passive LFG vents were installed. The six vents were constructed of 6-inch
perforated PVC pipe. Clean gravel was placed around the vents from approximately nine (9)
feet below grade to approximately five (5) feet below grade. The remainder of the
excavations were filled with soil.
Subsequent monitoring has indicated that the reduction in methane concentrations was
temporary and landfill gas concentrations in LFG-2A have rebounded to be above the lower
explosive limit. The report from Golder for this additional work is included in Attachment B.
The site is continuing to monitor landfill gas concentrations on a monthly basis in LFG-2 and
LFG-2A and is also monitoring LFG concentrations in the three vents (Eastern, Central and
Western), as well as water level measurements. We plan to use this additional data to
evaluate next steps for this site. Landfill gas monitoring will continue until three events
indicate concentrations less than the Lower Explosive Limit (LEL = 5% methane). After three
events, the site will return to quarterly LFG monitoring.
PROPOSED ADDITIONAL INVESTIGATION
To further evaluate whether the source of the subsurface gas detected in probe LFG-2A is
from the landfill or potential other sources, we propose to install a single additional
investigation probe UP-1 shown on the attached map). This probe will be located between
the landfill and LFG-2 to determine if LFG migration from the waste is the source of the
exceedances. This probe is temporary and will be used only for the purposes of this
investigation and will not be added to the permanent monitoring network. Data will be
collected from this probe and the monitoring network for a period of 90 days to further
evaluate landfill gas concentrations in these areas. After probe installation and the data
collection period, an updated report will be submitted with data summary, conclusions and
proposed actions.

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
Mr. Joseph Santangelo
November 4, 2021
Page 3 of 3
If probe IP-1 shows sustained landfill gas concentrations above the lower explosive limit,
three landfill gas vents will be installed in the waste as shown on Figure 1 to allow for
venting of landfill gas in this area.
Should you have any questions or require clarification, please contact us at [phone] or
by email below.
Sincerely,
SMITH GARDNER, INC. #*}��4••• �N ""..
may.. �
SEAL
DocuSigned by:
028426 -
Eu ,.
358C21 E64007440... #fit • �r • i�
W. Michael Brinchek, P.E. r*'% FACE gF�� *••�~
Senior Engineer 'i�
11/4/2021
mikefdsmithaardnerinc.com
Attachments
BEN EON
�r�i 9
DocuSigned by:
�ti
B9779EBA711F488... le.
Joan Joan A. Smyth, P.G. ,9 V
Senior Hydrogeologist A.
11/4/2021
ioanfdsmithaardnerinc.com

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
This page intentionally left blank.

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
Figures

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
This page intentionally left blank.

\
LEGEND
TRENCH LOCATION
f \ +
61
�8 _790
EXISTING 10' CONTOUR
(SEE REFERENCE 1)
z
w
W
N I \
/ EXPOSED ROCK/
g I—
O) ` 1 `
1 I I\ v — — —
— — EXISTING 2' CONTOUR
o m
LL m
zo
w E) E
I
7*7/
— —
o -LFG-1 \ — -
_ \
=
I
\ I \
APPROXIMATE PROPERTY LINE
(SEE REFERENCE 2)
U o
z
__
�� �� _
SEDIMENT 1 \ 801.3
1� CH4 i _ _ _ _\
/ i
v
LFG-3 \ \ 1
Q
m
BA Sfi4=�_ l
��178 \
99 (�%_= 1
� V� s,1.o III
—
4 /
1
200-FOOT BUFFER
=
a
603. /i/
I 763.8 I /�/�
9 5
\ \� _ — —
— 1 795. / / / \ \
/ 1�C��^
x810.9 " =�
— 20.0 X
011
I
I
PERMITTED WASTE LIMITS
+
o
o
a
z e�l I I11
xs,o.3
d�
I
LFG MONITORING PROBE
(SEE REFERENCE 3)
805.
-ao;;
_— —
1�.4 xd III 1
11 I _
PROPOSED LANDFILL GAS VENT
a
_
.WVES PROBE
�I (/,
\\ \\
Y
m
L
z
s3o = — III IIII I
I \�� ,8,0.4 LFG-I
\\ \\
FACILITY ND PROPERTY
w
a
RECLAMATION FACILITY '
\
\ \
BOUNDAR
I \
SITE EN NCE
z
/
C� y/ %/%/� % /f/ l
809.7 8, 0.7
CA S A
_
79
A
�AIEHOYSE \ 798.9
CD
w
z
l
IL
\�
o
x8
/648. // --
9.6 a1o.2 x808.
—
/ - 1
/ I
\ MAINTENANCE
ONTA/NE
BUILDING AND
STORAGE AREA
czn
a
L Q
Z
l
G-5\
\ \
CD
/o /
".�/
�- l ) >/J• " ,- -� )
�� ( —_— �� I )l��
—
'- T- � �
�)
1 \
\
T WASTE LIMITS
o
w �
o
a
of
__
/ Jll
/
x803.
,
x8o4.
95
7
a
�
79 y
IV
'\\ \\
N
o
/ \
/\34
U
z>
/ \
�86
P
SE �8o,.a—
��ii/i/�%�%�/i�////�/��
— -- 1 r'
HASE-3� / I I / /�
� i
RE)
860
/� I /' 11
l� /�r�� IIII
R-QPQSE
�j
REFERENCES:
1. EXISTING TOPOGRAPHY FROM AERIAL SURVEY DATED JANUARY 6
/ �/ l(l / J/
— �� I l 800
799
2018 BY GEODATA CORPORATION, ZEBULON, NC WITH FIELD SURVEYS
j /�� / /r/ I / if l/ IIII l/I ,
/ // I
i l/� \� =
i i \
\ \ \
\�'L
o
z z
DATED JANUARY 18, 2019 BY SURVEYING SOLUTIONS, P.C.
2. FACILITY PROPERTY LINE REFERENCE: SURVEY BY MARK TERRY AND
/ / / % //
% /l IIII 111 I / I I I
o \
- '
\ \JL
ASSOCIATES, INC., DATED MAY 15, 2001.
3. MONITORING LOCATIONS AND SPRINGHEAD LOCATIONS FROM DRAWING
"ENVIRONMENTAL MONITORING PLAN", SHEET EP-5, DATED 12/19/06;
:r /,o ✓ // I I1 III
s/ S ) r III
/ I/ / �� I I I I II
I l / ^ \ \ \ \
/
^J
\ / /
772.5
Cn
PIEZOMETER LOCATIONS FROM DRAWING "BORING, PIEZOMETER, AND
MONITORING WELL LOCATION MAP", SHEET DH 1, DATED 4/13/07,
�. JJ / � I
1—
s �/ / / 1 �J %III 11 I I I I
// //// J/
I s \
768.4 —_—_
/ �'
J
\ \
J
PREPARED BY GOLDER AND ASSOCIATES, GREENSBORO, NC.
//// / Ill IIII
- -' J / / �/
S /// / l� l
l/
��
II �� �) l 07� �� �� --
�/ \ %i / /�
/ / / /—
� / / /
\
_
CM
3:
ADDITIONAL POINTS FROM FIELD SURVEY DATED 3 18 16 BY
SURVEYING SOLUTIONS, YOUNGSVILLE, NC.
^ 1 / /I//
{ ao
/ \
(lam\ill/
/,
-- / I
—
\..\
\ \
\\\\
—
0 150' 300'
J i '%
Yo /
IIII
PH /
Jl 772.4TUR \ /
II
H S 5
FU
\
\
\
\
\ \ \ \ \\
o
© 2021 Smith Gardner, Inc.
— _ — =�l�l /jl/ / / I/ J
IIII I / 780 / ,
/ \ x787.7

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
THIS PAGE INTENTIONALLY LEFT BLANK

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
Attachment)

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
This page intentionally left blank.

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
S G PHOTOGRAPHIC LOG
Client Name: Site Location: Project No.
GFL Environmental WI High Point C&D Landfill WlHighPoint-21-3
Photo No. Date:
j July 2021
Direction Photo Taken:
East
Description:
East Trench during
excavation
Photo No. Date:
2 July 2021
Direction Photo Taken:
East
�cg
3 AsW
}
Description:
',Y � t
y J
a ✓ - y ieC 4 t. _
Construction of the �: a
East Trench
- )4
�a e

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
This page intentionally left blank.

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
Attachment

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
This page intentionally left blank.

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
GOLDER
46%0 MEMBER QF WSP
September 28, 2021
Project No. 2013788121.901
Joseph Santangelo, Regional Environmental Compliance Manager
GFL Environmental Inc.
1192 McClellandtown Road
McClellandtown, Pennsylvania 15458
[e-mail]
RE: SUMMARY OF EXCAVATION AND GAS VENT INSTALLATION ACTIVITIES
HIGH POINT LANDFILL, PERMIT NO. 41-16 (C&D)
JAMESTOWN, NORTH CAROLINA
Dear Joe,
Golder Associates NC, Inc. (Golder) has prepared this letter report to document the excavation of four test pits on
September 9, 2021 and the installation of two landfill gas vents on September 13, 2021 at the WI High Point
Construction and Demolition (C&D) Landfill, Permit Number 41-16.
Background
During the second quarterly methane monitoring event for 2021, concentrations of methane above the lower
explosive limit (LEL) were detected and confirmed at LFG-2A. Golder provided a notification to the North Carolina
(NC) Department of Environmental Quality (DEQ) of the confirmed exceedance on June 2, 2021. Smith+Gardner
prepared the required Landfill Gas Remediation Plan (LFGRP) per 15A NCAC 13B .0544(d)(3)(C) and submitted
it to the NC DEQ, which was approved on August 2, 2021. The LFGRP included the installation of a trench near
the toe of the berm north of LFG-2A, which was backfilled with gravel; a passive gas vent was installed in the
gravel pack, which is referred to as the Eastern Vent on the attached Drawing 1. The area below the berm was
regraded to divert surface water away from landfill gas probes LFG-2 and LFG-2A. Methane has continued to be
measured above the LEL in LFG-2A based on measurements collected since that time.
During an onsite meeting with representatives from WI High Point Landfill, LLC (WI), Golder, and Smith+Gardner
on August 23, 2021, the need for additional vents and potential locations was discussed. Based on these
discussions, three locations along the berm near LFG-2A were identified for test pits to determine if organic debris
is present in the berm. A fourth location for a test pit was also identified between the berm and the reclamation
pad to determine if organic debris was used to fill a former natural drainage feature near LFG-2A. It was decided
that additional vents and gravel may be installed in one or more of the test pits depending on the amount and
composition of any organic material that was encountered.
Golder Associates Inc.
5B Oak Branch Drive, Greensboro,
North Carolina. USA 27407
T: [phone] F: [phone]
Golder and the G logo are trademarks of Golder Associates Corporation. golder.com

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
Joseph Santangelo, Regional Environmental Compliance Manager Project No. 2013788121.901
GFL Environmental Inc. September 28, 2021
Excavation and Vent Installation
Representatives from Golder and the facility completed the test pit excavations on September 9, 2021. Three pits
were excavated within the berm, ranging from approximately 7 - 10 feet below ground surface (bgs) and an
additional pit was excavated near the corner of the reclamation pad to a depth of approximately 5 feet bgs. The
approximate test pit locations are provided on Drawing 1 and a photographic log is attached. No significant
organic material was noted in any of the pits and the highest methane reading from any of these pits was 0.4% by
volume. Methane was measured at landfill gas probe LFG-2A at 51.7% by volume prior to beginning the
excavation activities.
The pits were allowed to remain open overnight, and Golder returned the following day to monitor methane
concentrations at LFG-2A. Methane was measured at 29.9% by volume, which was approximately 20% lower
than the concentration measured the day before just before the pits were excavated. Due to the decline in
methane concentrations at LFG-2A, as agreed upon by WI, representatives from Golder and the facility began
plans to install gas vents in the two excavations closest to LFG-2A.
On September 13, 2021, facility personnel and a Golder representative installed two passive landfill gas vents
(Central and Western Vents) within the berm (Drawing 1). Site personnel deepened the two excavations to
approximately 10.5 feet bgs prior to installing each of the gas vents. Six-inch schedule 40 polyvinyl chloride
(PVC) pipe was placed vertically into each of the excavations. The PVC riser was perforated with quarter inch
holes between nine feet and five feet bgs. A clean gravel was placed around the perforated sections to
approximately three feet bgs. The remaining excavation was filled with soil. The PVC riser was topped with a
turbine vent approximately six feet above ground surface. The other two excavations were backfilled with soil.
Construction information is shown on Table 1 and photographs are included in the attached log.
After installation, methane was measured at 17.5% by volume at LFG-2A. Methane was measured at 1.2% by
volume at LFG-2A on September 20, 2021. Methane will continue to be monitored at LFG-2A on a monthly basis
to fully gage the effectiveness of the two new gas vents.
Closing
Based on initial data, it appears the pit excavation and additional vents were successful in reducing the methane
concentrations at LFG-2A. Golder will continue to perform monthly monitoring of LFG-2A until concentrations of
methane are below the LEL (5%) for 2 consecutive events. If you have any questions or require any additional
information, please contact the undersigned at [phone].
Sincerely,
Golder Associates Inc.
David "Dusty" Reedy Y. Reedy II, PG
Senior Hydrogeologist
Rachel P. Kirkman, PG
Principal and Senior Consultant
GOLDER
4 MEMBE11
O1
-1

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
Joseph Santangelo, Regional Environmental Compliance Manager
GFL Environmental Inc.
Project No. 2013788121.901
September 28, 2021
C: Seth Heath, General Manager,5830 Riverdale Drive, Jamestown, NC 27282,
[e-mail], 336-886-3560
Bryan Wuester, Regional Landfill Manager, GFL Environmental, 7434 Roseboro Highway, NC
28382, [e-mail] (Electronic Copy)
Joseph Santangelo, Regional Environmental Compliance Manager, GFL Environmental Inc.,
1192 McClellandtown Road, McClellandtown, PA, 15458, [e-mail]
(Electronic Copy)
Travis Hitchcock, Region Vice President, GFL Envrionmental, 3301 Benson Drive, Suite 601,
Raleigh, NC, 27609, [e-mail] (Electronic Copy)
Attachments: Drawing 1 — Methane Monitoring Location Map
Table 1 — Summary of Data for Newly Constructed Vents
Attachment 1 — Photographic Log
https://golderassociates.sharepoint.com/sites/141364/project files/5 technical work/phase 901 berm excavation/deliverables/final/2013788121.901-001-r-rev0-hp_vent_install_rpt.docx
GOLDER
4 MEMB-11-1-1

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
This page intentionally left blank.

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
6 1 81 0, Z
qcw2
-'i
0L
0�q
09
a
�I
O
M
�I
co
r-
a2
0
N
co
z
a)
LL
.3
m
0
g
U)
z
0
Q
Q
U
X
w
0
z
Q
•RON
�1��'
ne
%rI
EXCAVATION 2
_ AI
ECLAMATION
FACILITY LFG-4"'
��. _SCALE
/ C
• HOUSE' �own
0-
' ui /��J�il Ali
79
ON
�l� ��\1� ✓'"���� `$`���\gibs -
��El
Ul
C R E(EK/
OL-
og
r
0
101
O
SCALE FEE I "AN/
WIHIGHPOINT LANDFILL, LLC
4
//coNsuLrnn*
YYYY-MM-DD 2021-09-23
i PREPARED BPG
G 0 L D E R
/ DESIGN DYR
MEMBER OF WSP REVIEW DYR
GOLDER ASSOCIATES NC, INC.
APPROVED RPK
29
SITE LOCATION
t _
f\I
i
,} I
SITE LOCATION MAP
LEGEND
EXISTING 10' CONTOURS
EXISTING 2' CONTOURS
— —
PROPERTY LINE
STREAM / DRAINAGE FEATURE
TREELINE
EXISTING ROAD
— — — — —
PROPOSED OR EXISTING LIMITS OF WASTE
- MW-3
MONITORING WELL LOCATION
❑ SW-1
SURFACE WATER MONITORING POINT
LFG-1
LANDFILL GAS MONITORING WELL LOCATIONS
® BM-1
BENCH MARK
S13-1
SEDIMENT BASIN
0
GAS VENT
EXCAVATION
NOTES
1. TOPOGRAPHIC CONTOUR INTERVAL = 2 FEET
2. DRAWING BASED ON SITE PLAN PLAN PREPARED BY JOYCE ENGINEERING, INC DATED
J U LY 7, 2004.
3. UPDATED TOPOGRAPHY IN VICINITY OF LANDFILL PROVIDED FROM AERIAL SURVEY
PREPARED BY COOPER AERIAL SURVEY COMPANY, DATE JANUARY 6, 2021.
PROJECT
WI HIGH POINT CONSTRUCTION AND DEMOLITION DEBRIS
LANDFILL AND RECLAMATION FACILITY
GUILFORD COUNTY, NORTH CAROLINA
TITLE
METHANE MONITORING LOCATION MAP
PROJECT No. Rev. DRAWING
2013788121 0
c
i
c
L
0

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
THIS PAGE INTENTIONALLY LEFT BLANK

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
September 2021
Project No. 2013788121
Table 1
Summary of Data for Newly Constructed Vents
High Point CDD Landfill, Permit No. 41-16
High Point, North Carolina
Vent
Date of
Vent Depth
Vent Screened
Coordinates
Interval (ft
Identification
Installation
(ft bgs)
Latitude
Longitude
bgs)
Western Vent
9/13/2021
10.5
9-5
35.952868
-79.922532
Central Vent
9/13/2021
10.5
9-5
35.952886
-79.922614
Notes:
1. ft bgs = feet below ground surface
G0LDER
MEMBER of W5P
1 of 1

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
This page intentionally left blank.

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
September 2021
f GRYAW.ifAIMI8y
4 GOLDER

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
September 2021
Photograph 3:
Excavation 2 located
West of LFG-2A.
T -
;AI1 -
_
W 4
Photograph 4: Western
Vent constructed in
Excavation 2 prior to the
installation of the turbine
vent.
GOLDER 2

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
September 2021
f GRYAW.ifAIMI8y
4 GOLDER

DocuSign Envelope ID: 46A734CF-C4A0-4104-A48D-52F224E091DA
September 2021
east at the newly
installed Western Vent
and Central Vent and
the nmvinusly installed
f GRYI.I:ifAININ
4 GOLDER