4116_Guilford_WI_GFL_HighPoint_CDLF_LFG2AExcavation_FID1665184_20220427

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_`EEN FOR LIFE
e n v i r o n m e n t a
April 27, 2022
Ms. Jaclynne Drummond, Hydrogeologist
Department of Environmental Quality, Division of Waste Management, Solid Waste Section
2090 US Highway 70
Swannanoa, North Carolina 28778
[e-mail]
RE: LANDFILL GAS PROBE LFG-2A EXCAVATION
HIGH POINT CONSTRUCTION AND DEMOLITION LANDFILL
PERMIT NO. 4116-CDLF-2012
Dear Ms. Drummond,
WI High Point Landfill, LLC, is submitting the enclosed report which summarizes the activities
associated with the excavation of landfill gas probe LFG-2A at the above -referenced facility. If
you have any questions, please contact me at [phone].
Sincerely,
WI High Point Landfill, LLC
Joseph Santangelo
Regional Environmental Compliance Manager
Enclosure
C: Dusty Reedy, PG, Golder Associates NC, Inc., 5B Oak Branch Drive, Greensboro, North
Carolina, 27407, 336-852-4903, [e-mail]
Travis Hitchcock, 3301 Benson Drive, Raleigh, North Carolina, 27609.
(travis.hitch cock@gflenv. com), (letter only).
Bryan Wuester, Regional Landfill Manager, 7434 Roseboro Highway, Roseboro, Sampson
County, North Carolina 28382, [e-mail]
Seth Heath, General Manager, 5830 Riverdale Drive, Jamestown, North Carolina 27282,
[e-mail], 336-886-3560
1236 Elon Place High Point NC, 27263
Tel.: [phone] Fax: [phone] gflenv.com

NNtil) GOLDER
April 27, 2022
Joseph Santangelo, Regional Environmental Compliance Manager
GFL Environmental Inc.
3301 Benson Drive, Suite 601
Raleigh, North Carolina 27609
[e-mail]
Project No. 2013788122.500
SUMMARY OF LANDFILL GAS PROBE LFG-2A EXCAVATION
HIGH POINT CONSTRUCTION AND DEMOLITION LANDFILL AND RECLAMATION FACILITY
PERMIT NO. 4116-CDLF-2012
Dear Joe,
Golder Associates NC, Inc., a member of WSP (Golder), has prepared this letter report to document the
excavation of landfill gas probe LFG-2A and surrounding soils on March 30, 2022 at the High Point Construction
and Demolition (C&D) Landfill, Permit Number41-16.
BACKGROUND
A Landfill Gas Remediation Plan (LFGRP) was submitted to the North Carolina (NC) Department of
Environmental Quality (DEQ) by Smith+Gardner (S+G) on July 26, 2021 and was approved by the NC DEQ on
August 2, 2021. As proposed in the LFGRP, the installation of a vent in the berm adjacent to LFG-2A and re-
grading the area to promote better drainage began on July 23, 2021. Golder installed two additional vents in the
vicinity of LFG 2A on September 13, 2021. S+G submitted a Landfill Gas Remediation System Construction
Record and Update Report to the NC DEQ on November 4, 2021. The installation of an additional landfill gas
monitoring probe (IP-1) between the landfill was unit and LFG-2A was proposed in this report. The probe was
installed by S+G in December 2021. S+G submitted a Landfill Gas Remediation System Update Report to the NC
DEQ on February 23, 2022. The report proposed that LFG-2 should replace LFG-2A and that LFG-2A should be
excavated, which was approved by the NC DEQ on February 25, 2022.
PRE -EXCAVATION ACTIVITIES
On March 30, 2022, prior to beginning the excavation of LFG-2A, methane was measured at LFG-2A and the
surrounding landfill gas probes and vents using a Landtec° GEM5000 landfill gas monitoring instrument. The
results are summarized below.
Golder Associates NC, Inc.
5B Oak Branch Drive, Greensboro, North Carolina, USA 27407
Engineering Lic. No. C-2862/Geology Lic. No. C-399
Golder Associates NC, Inc. is a licensed user of the Golder trademark, and an associated operating entity.
T: [phone] F: [phone]
golder.com

Joseph Santangelo, Regional Environmental Compliance Manager
GFL Environmental Inc.
Table 1 - March 30, 2022 Methane Concentrations
Project No. 2013788122.500
April 27, 2022
PointMonitoring
LFG-2A
18.6
LFG-2
0
IP-1
0
Eastern Vent
0
Central Vent
0
Western Vent
0
EXCAVATION OF LFG-2A AND SURROUNDING SOILS
Landfill gas probe LFG-2A was originally installed to a depth of 15 feet below ground surface (ft bgs) on April 24,
2019. The boring log is included as an attachment for reference. Facility personnel excavated LFG-2A on March
30, 2022 under the oversight of a Golder geologist. The excavation was performed with a Caterpillar° 320
excavator. The surface completion, which included the steel protective casing and the concrete apron, was
removed.
The excavated soils were screened with a Honeywell MiniRAE 3000+ photoionization detector (PID) and a
Landtec° GEM5000. The initial excavation was completed to approximately 15 ft bgs to remove the well
construction materials. Soil screening readings from the PID between ground surface and 12 ft bgs ranged from
approximately 0.4 to 6.4 parts per million (ppm). Soil screening readings from the PID between 12 and 15 ft bgs
ranged from approximately 0.4 to 0.6 (ppm). Methane was not detected at any soil screening interval using the
GEM5000.
After the removal (i.e., decommissioning) of LFG-2A, the excavation was extended a bucket width (approximately
4 ft) to the east. The excavation was advanced to a depth of approximately 12 ft bgs based on the PID readings
from the initial excavation. Soil screening readings from the PID between ground surface and 12 ft bgs ranged
from approximately 0.0 to 0.6 ppm. Based on the PID readings, the excavation was not extended any further to
the east.
Next, the excavation was extended a bucket width to the west to a depth of approximately 12 ft bgs. Soil
screening readings from the PID between ground surface and 12 ft bgs ranged from 1.0 to 30.0 ppm. The
excavation was extended approximately 17 ft further to the west a bucket with. Soils continued to be screened at
regular intervals and readings from the PID between ground surface and 12 ft bgs ranged from approximately 0.5
to 27.2 ppm. The excavation was extended an additional bucket width to the west and the PID readings ranged
from approximately 0.0 to 7.0 ppm.
A summary table of ranges of PID readings for the initial excavation and for each bucket width the excavation was
extended is presented below.
%\til) GOLDER

Joseph Santangelo, Regional Environmental Compliance Manager Project No. 2013788122.500
GFL Environmental Inc. April 27, 2022
Table 2 - PID Readings of Excavated Soil
The excavation was terminated based on the PID readings and because the excavator would not be able to
continue without the removal of trees. The total dimensions of the excavation were approximately 14 ft wide and
30 ft long (east to west) with a depth of approximately 12 ft bgs except at LFG-2A, which extended to 15 ft bgs.
The soil removed from the excavation was hauled to the landfill and soil from the borrow area was used to backfill
the excavation. Below the depth of the berm, the soils appeared to be in -situ saprolitic soils and no staining or
abundance of organic material was observed.
CLOSING
Based on our field observations, LFG-2A has been completely removed (i.e., decommissioned). During the
excavation of LFG-2A and the surrounding soils, no obvious source of the methane concentrations observed at
LFG-2A were noted. However, PID readings of the excavated soil indicate that there may have been a localized
organic potential methane source that is unrelated to the waste unit. If you have any questions or require any
additional information, please contact the undersigned at [phone].
Sincerely,
Golder Associates NC, Inc.
David "Dusty" Y. Reedy II, PG
Rachel P. Kirkman, PG
Sr. Lead Consultant, Geologist Director, Geologist
CC: 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)
Travis Hitchcock, Region Vice President, GFL Environmental, 3301 Benson Drive, Suite 601,
Raleigh, NC, 27609, [e-mail] (Electronic Copy)
Attachments: Drawing 1 — LFG-2A Excavation Location Map
Attachment 1 — LFG-2A Boring Log
Attachment 2 — Photographic Log
https://golderassociates.sharepoint.com/sites/157587/project files/5 technical work/task 500 general consulting/001 Ifg-2a
excavation/deliverables/fi nal/2013788122.500-001-r-reva.docx
%\til) GOLDER

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GOLDER ASSOCIATES NC, INC.
APPROVED RPK
NOTES
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SITE LOCATION
off.
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SITE LOCATION MAP
EXISTING 10' CONTOURS
EXISTING 2' CONTOURS
PROPERTY LINE
STREAM / DRAINAGE FEATURE
TREELINE
EXISTING ROAD
PROPOSED OR EXISTING LIMITS OF WASTE
MONITORING WELL LOCATION
LANDFILL GAS MONITORING WELL LOCATIONS
SEDIMENT BASIN
GAS VENT
1. TOPOGRAPHIC CONTOUR INTERVAL = 2 FEET
2. DRAWING BASED ON SITE PLAN PLAN PREPARED BY JOYCE ENGINEERING, INC DATED
JULY 7, 2004.
3. UPDATED TOPOGRAPHY IN VICINITY OF LANDFILL PROVIDED FROM AERIAL SURVEY
PREPARED BY COOPER AERIAL SURVEY COMPANY, DATE JANUARY 6, 2021.
4. THE LOCATION OF LANDFILL GAS MONITORING PROBE IP-1 IS APPROXIMATE.
PROJECT
HIGH POINT CONSTRUCTION AND DEMOLITION DEBRIS
LANDFILL AND RECLAMATION FACILITY
GUILFORD COUNTY, NORTH CAROLINA
TITLE
LFG-2A EXCAVATION LOCATION MAP
Ii
PROJECT No. Rev. DRAWING
20-13788122 0
0

DocuSign Envelope ID: CADBCE90-CBCE-4AFS-ACCB-DFC4A2AB3337
SMITH GARON4R
19ORINGID: LFG•2A
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Mather Glear, Hot
Ground Elavation. NA
Caste Sfarfed puzana
Do in of Barr ' Is,
Dddlng Contractor GeoEx loration
TOCElavatian. NA
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WatorLevel: NA
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MATERIALS: Color, else, range, MAIN COMPONENT, minor componontisi, moisture
content, structure, ■nguiarlty, maximum g rain size, odor, and Goologlc Unit ill
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April 2022
Photograph 3:
The complete
excavation.
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