1304_Cabarrus_CharlotteMotorSpeedwayV_MSWLF_Phase4_GeologicObservation_FID1818676_20231003

Environmental Consultants & Contractors
October 3, 2023
File No. 02218304.05
Ms. Jaclynne Drummond
North Carolina Department of Environmental Quality
2009 U.S. Highway 70
Swannanoa, NC 28778
Subject: Report of Geologic Observation
Phase 4 Construction
Charlotte Motor Speedway Landfill - V (MSWLF)
Permit No. 1304-MSWLF-1992
Cabarrus County, North Carolina
Dear Ms. Drummond:
SCS Engineers, PC (SCS), on behalf of Atlantic Coast Consulting, Inc. and BFI Waste Systems of North
America, LLC (a wholly owned subsidiary of Republic Services, Inc.), submits this Report of Geologic
Observation for Phase 4 at the Charlotte Motor Speedway (CMS) Landfill - V. Phase 4 is a roughly
7.15-acre cell bound by existing closed cells 2C-2F to the north, west, and east, and bound to the
south by the existing landfill service road. At this time, Phase 4 has been excavated and/or
backfilled to the permit design subgrade and is ready for placement of the landfill's base liner
system.
For the preparation of this report, the Phase 4 Design Hydrogeologic Report dated April 2021,
prepared by SCS was reviewed. This report contains information on the geology and hydrogeology
conditions within the Phase 4 footprint which we compared our findings to.
GEOLOGIC OBSERVATION
The following is a summary of the geologic field observations by Mr. Jared Hamela P.G., a licensed
NC geologist, on April 4, July 13, and September 8, 2023. This was performed to fulfill the Phase 4
Permit Approval to Construct, Attachment 2 Conditions of Permit Approval to Construct, condition
number 13 (File ID: 1695529).
Native soils within the Phase 4 footprint that were determined unsuitable to underlie the
landfill base liner system were removed and backfilled with suitable soils per the Phase 4
construction drawings and specifications. Contractor excavation of unsuitable soils was
performed to bedrock at a depth of approximately 20-25 feet below the existing ground
surface and backfilled with suitable soils to the base liner system subgrade design
elevations.
• No blasting of rock was required in this area.
Remnant cobbles of diabase, syenite, and quartzite were observed at approximately 20-25
feet below ground surface at the base of the excavation on the remnant surface water
feature constituting the top of the formation.
A
2520 Whitehall Park Drive, Suite 450, Charlotte, NC 28273 1 704-504-3107 L.10

Ms. Jaclynne Drummond
October 3, 2023
Page 2
■ Soils observed included tan, light brown, and light red -brown silty sand, sandy silt, and silty
clay (SM, ML, and CL) residuum from gabbro (diabase) and syenite parent material
consistent with the Concord Pluton of the Charlotte Belt.
■ A remnant intermittent or ephemeral surface water feature flows beneath Cells 2C, 2E, and
Phase 4. Flow from the remnant water feature is collected and transmitted by an existing
lateral underdrain that directs the flow beneath the proposed Phase 4. A plan to connect
the existing underdrains to a main underdrain and continue to divert flow underneath the
proposed Phase 4 was approved by NCDEQ on March 21, 2023 (FID 1777008) and is
depicted in Attachment A. The outlet of the underdrain will be added to the updated water
quality monitoring plan for the facility in a subsequent submittal.
The geology area observed appears to be consistent with the observations and geologic evaluations
documented in the design Hydrogeologic Report cited above. A photographic log of the field
observations is provided as Attachment B. No geologic or hydrogeologic features (i.e. pinnacles, tors,
or springs) above the constructed cell subgrade established by the contractor were observed. The
cell's exposed conditions appear consistent with the expectations identified in the permit documents
and conditions reported in previous cells. A modification to the Water Quality Monitoring Plan for the
addition of the underdrain outlet to the sampling network will be provided in a subsequent submittal.
No other geologic features are present that would impact the construction or operation of Phase 4.
This report will also be presented as a component of the Construction Quality Assurance (CQA) report
for Phase 4. If you have questions, please do not hesitate to contact either of the undersigned at
[phone].
Sincerely,
Jared T. Hamela, PG
Senior Project Geologist
SCS ENGINEERS, PC
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Albert D. Glenn, PE
Project Director
SCS ENGINEERS, PC
Enclosure: Attachment A - Installed Underdrain Pipe Plan
Attachment B - Photographic Log
cc: Mike Gurley - Environmental Manager, Republic Services, Inc.
Taylor Herbertson - Atlantic Coast Consulting, Inc.
M:\PROJECT FILES\02218304.05\Deliverables\1304 - CMS - Phase 4- Geologic observation v.5.docx

Attachment A
Installed Underdrain Pipe Plan

COMPACTED SUBGRADE 24" MIN
SOIL BACKFILL r_� 12"
OVERLAP
r --_ -- -�
8 OZ/SY NON -WOVEN I I
GEOTEXTILE WRAP 12"
(SEE NOTE raa2) <_: I MIN
_ I
24" oV oV -
MIN
8" PERFORATED HDPE 4"
SDR-11 UNDERDRAIN PIPE MIN
NOTES: WASHED NCDOT #5 AGGREGATE
1. UNDERDRAIN PIPE IS 8-INCH PERFORATED HDPE SDR-11 PIPE. THE UNDERDRAIN
PIPE WAS INSTALLED AT A MINIMUM OF 1.5% SLOPE.
2. THE GEOTEXTILE FABRIC OVERLAP WAS LEISTERED.
PERFORATED UNDERDRAIN PIPE
COMPACTED SUBGRADE
SOIL BACKFILL,
24' MIN
8" DIA. SDR-11
PERFORATED PIPE O j�
90'
IIIIIIIIIII III
III VARIES
�1/2,.
HOLES
1=1 1=1 1=1
MIN 2N
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2
IIIIII 11 II
8" SOLID HDPE SDR
90'
0
UNDERDRAIN PIPEIPE MIN
O \ /
V\
MANUALLY COMPACT SUBGRADE
SOIL AROUND PIPE
UNDERDRAIN PIPE PERFORATION PATTERN
NOTES:
1. PERFORATED UNDERDRAIN PIPE TRANSITIONS TO 8-INCH
DIAMETER SOLID HDPE SDR-11 PIPE ±40 LF UPGRADIENT
OF THE INLET TO THE EXISTING CULVERT PIPE
NTS
NTS
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0
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EXISTING
CELL 2C /
w`
- 2 FOOT ELEVATION CONTOUR
610 - 10 FOOT ELEVATION CONTOUR
WATER COURSE OR IMPOUNDMENT
�- =TREE LINE
PROPERTY BOUNDARY
- ASPHALT PAVED ROAD
GRAVEL COVERED ACCESS ROAD
_ - EDGE OF LINER OR CELL LIMIT
FENCE
SOLID UNDERDRAIN PIPE
NTS
EXISTING CELL 2E
PHASE 2 �
EXISTING CELL 2E EL — EL EL E4
PHASE 1
j " �� EL-� EL
E -
LEGEND
0
' EXISTING UNDERDRAIN PIPE -- --_- _-
(ORIENTATION ESTIMATED) -
fL
-- PERFORATED UNDERDRAIN OUTLET
N: 585.302.78
.... UD— 572.0 E: 1,504,279.62 '
a» s INVERT EL: 571.97 MSL
0
°XISTING
CELL 2F
v \ EL E --- -
--
€6 i EL
PROPOSED LEACHATE / _- / 590
COLLECTION SUMP --
_ - —
UD- sc�s56 SEE NOTE 3 II --1 / �_580 UNDERDRAIN OUTLET LOCATIO
-- - •_ ,SEE NOTE 5 570 �
cos seze � 1.7%
GRAVEL UNDER DRAIN OUTLET OOd 62.5 71wa 4 0 559' 6 I - -- •�, - --
N: 585,391.79 _ _ „ • . --- 560�
E: 1,504,238.40 m 1.5
—
INVERT EL:567.46 MSL ,n PERFORATED UNDERDRAIN PIPE %
\s SEEILS SEDET OTE 4
4
\9 EXISTING GRAVEL UNDERDRAIN -- SEE N -. -
(ORIENTATION ESTIMATED) s PHASE IV BASE LINER SYSTEM p
\ GEOMEMBRANE LINER ANCHOR
TRENCH > CC
EXISTING CULVERT PIPE \ _ ` C1 -10 C
PHASE N -
��� E:1,504,206.18
INVERT EL: 557.41 MSL
SECTION OF EXISTING CULVERT
73 \ 7 PIPE REMOVED (SEE NOTE 5) s�
73 __
3 CULVERT PIPE INLET (SEE NOTE 4)
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73 50
0 50 100 150
SCALE IN FEET he
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U m
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EXISTING
PROPOSED
OMH-##
- LEACHATE CONVEYANCE MANHOLE
- 2 FOOT SUBGRADE ELEVATION CONTOUR
°@ LC-XX
- LEACHATE COLLECTION PIPE CLEANOUT
-580-
- 10 FOOT SUBGRADE ELEVATION CONTOUR
A UD-#
SURVEYED EXISTING UNDERDRAIN
EL -
EDGE OF LINER OR CELL LIMIT
LOCATION
PUD -
- PERFORATED UNDER DRAIN PIPE
CULVERT
A
_ SURVEYED CULVERT PIPE LOCATION
- SUD -
- SOLID UNDER DRAIN PIPE
BMW-#
- GROUNDWATERMONITORINGWELL
/MMW-#
- METHANEGASMONITORINGWELL
NOTES:
1. EXISTING SURFACE TOPOGRAPHY FROM DECEMBER 9, 2021 AERIAL
SURVEY BY COOPER AERIAL SURVEYS.
\
NOTES:
1. PROPOSED TOPOGRAPHY SHOWN ON THIS DRAWING REPRESENTS
TOP OF THE PHASE IV SUBGRADE.
EXISTING
2. INVERT ELEVATIONS AND LOCATIONS FOR UNDERDRAINS UD-1 & UD-2
AND THE EXISTING CULVERT PIPE WERE SURVEYED BY THE PHASE IV
CELL 2D
CONTRACTOR.
3. AS -BUILT UNDERDRAIN PIPES ARE PERFORATED & SOLID 8-INCH
\
DIAMETER HDPE SDR-11. PIPES ARE INSTALLED AS SHOWN ON THE'I
PLAN AND DETAILS SHOWN ON THIS DRAWING. THE UD-1 AND UD-2
PIPE CONNECTION IS MADE WITH AN 8-INCH HDPE SDR-11 WYE
FITTING.
4. APPROXIMATELY 40-FT UP SLOPE OF THE CULVERT PIPE INLET, PIPE
TRANSITIONS FROM PERFORATED TO SOLID 8-INCH HDPE SDR-11 PIPE.
THE SOLID PIPE EXTENDS THROUGH THE EXISTING CULVERT PIPE (SEE
NOTE 5) TO THE APPROXIMATE LOCATION SHOWN ON THIS DRAWING.
5. THE EXISTING CULVERT PIPE WITHIN PHASE IV LIMITS WAS REMOVED.
THE REMAINING CULVERT PIPE WAS ABANDONED IN -PLACE BY FILLING
THE ANNULAR SPACE WITH CONCRETE.
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DATE:
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Attachment B
Photographic Log

South Portion Phase 4 facing South
South portion Phase 4 facing North
depicting unsuitable soils that
were removed
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CMS Landfill - V Project Number:
Permit No. 1304-MSWLF-1992 02218304.05
Phase 4
5105 Morehead Road Page 1 - 04/04/2023
Concord, NC 28027

South portion Phase 4 facing North
North portion Phase 4 facing Northeast
CMS Landfill - V Project Number:
Permit No. 1304-MSWLF-1992 02218304.05
Phase 4
5105 Morehead Road Page 2 - 07/13/2023
Concord, NC 28027

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cornerSoutheast - 4 facing Northeast
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