8202_SampsonCoMSWLF_20170203_Cell10GGIInstallationReport_DIN27501

February 3, 2017

Ms. Elizabeth Werner
Hydrogeologist
North Carolina Department of Environmental Quality
Solid Waste Section
1646 Mail Service Center
Raleigh, NC 27699-1646

RE: Gravity Groundwater Intercept Installation – Cell 10
Sampson County Disposal, LLC Landfill
Roseboro, North Carolina

Dear Ms. Werner:

Sampson County Disposal, LLC (SCD) began construction on the gravity groundwater
intercept (GGI) project for Cell 10 in July 2016, in accordance with the Phase III PTC dated
November 20131. Smith Gardner, Inc. (S+G) on behalf of SCD has prepared this letter report
to present updated construction information as well as piezometer installation information
for future GGI performance monitoring.

GGI System Background

Currently, four Cells (Cells 6, 7, 8 and 9) have been constructed with GGI systems at the
Sampson County Landfill. The GGI system uses a series of trenches that intercept and
gravity drain groundwater underneath the cells to maintain a potentiometric surface
elevation beneath the landfill. The GGI system drains to a sump underneath each cell. Each
sump is connected to a discharge line which gravity drains to Bearskin Swamp. The system
is designed to maintain a minimum four-foot separation between the landfill subgrade and
the potentiometric surface. The GGI system has been in use at this site since the first
installation in 2005. An existing conditions map which shows the location of Phase 3 and Cell
10 within the 82-02 permitted footprint is included as Figure 1.

The initial GGI system, proposed in 2004, was designed to depress the uppermost aquifer
elevation; creating a more effective landfill design and balancing the earthwork on-site for
future landfill cell construction and operation. The initial demonstration2 evaluated the Cell
6 GGI system, the effective use of GGI systems beneath the remaining proposed landfill cells
and the overall effectiveness on the aquifer. The Cell 7 system was completed in November
2008, Cell 8 was completed in March 2010, and Cell 9 was completed in April 2014.
Construction began on the Cell 10 GGI system in July 2016 and concluded in August 2016.

1 Permit to Construct Application, Sampson County Disposal, LLC, MSW Landfill Phase 3 and C&D
Landfill Cells 2B &3, Smith Gardner, Inc., November 2013.
2Letter from G. N. Richardson and Associates, Inc. to Bobby Lutfy of NCDENR, February 15, 2005.
DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08
Ms. Werner
February 3, 2017
Page 2 of 3

GGI Installation

Initial construction activities for Cell 10 were conducted in conjunction with Cell 9
construction in 2015 and 2016; this included excavating portions of the cell to bring areas
adjacent to the GGI system piping close to subgrade elevations. To assist with the
excavation, a series of temporary dewatering well points were installed and groundwater
was pumped to a nearby sediment basin. The GGI System installation for Cell 10 began with
Bentley Development Co, Inc. mobilizing equipment to the site on July 12, 2016. The GGI
system in the cell was installed as specified using Type GT-S fabric, 12" perforated CPE pipe,
and No. 57 stone. Cell 10 discharged to the Northern GGI discharge point to assist to assist
the GGI in reducing groundwater elevations to the required separation elevation below
subgrade. Cell 10 GGI system construction was completed on August 2, 2016. No system
design modifications were made for the Cell 10 GGI. A site plan showing Cell 10 with the
constructed (as-built) GGI system is included as Figure 2.

GGI System Monitoring

Nine temporary piezometers (PZ-10A through PZ-9I) were installed on August 1-2, 2016 to
monitor the effectiveness of the Cell 10 GGI system. The piezometers ranged in depth from
10 to 20 feet below grade. Piezometers were installed in accordance with the State rules for
installation of monitoring wells3. Martin Moulds, a licensed driller with GeoTechnologies,
Inc. PA4 performed the well installation services under the supervision of Madeline German,
P.G. of S+G. The piezometer locations are shown in Figure 2. Piezometer boring logs and
well installation records are included in Attachment A. In general, sand was the
predominant soil type encountered during piezometer installation as shown on the geologic
cross-sections included in Figure 3.

Five piezometers (PZ-10A through PZ-10E) have been monitored since installation with
dedicated Schlumberger Mini-Diver Dataloggers that record water levels daily. Additional
dataloggers were installed in the remaining four wells (PZ-10F through PZ-10I) in November
2016.

Existing Conditions
On January 4, 2017 the most recent water level measurements were collected from the site.
Due to Hurricane Matthew, piezometers PZ-10A, 10B and 10C remain above their target
water levels to meet separation requirements for the design subgrade. The remaining
piezometers have achieved their target water levels.

Graphs illustrating groundwater elevations and target separation from subgrade are
included as Attachment B.

3 15A NCAC 2C.0108, Standards of Construction: Wells Other Than Water Supply
4 GeoTechnologies, Inc. PA, 3200 Wellington Ct #108, Raleigh NC 27615
DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08
Ms. Werner
February 3, 2017
Page 3 of 3

Conclusions

The Cell 10 GGI system has been installed in general accordance with the submitted permit
drawings. S+G will continue to monitor water table elevations in the Cell 10 area to
determine final proposed subgrade separation. S+G will notify NCDEQ of any additional
modifications to the GGI system as this demonstration continues. Following final GGI system
effectiveness determination, groundwater elevation data, and information on any further
revisions to the proposed subgrade will be submitted to NCDEQ for review.

Please contact us at [phone] or by email below if you have any questions or require
any additional information.

Sincerely,
SMITH GARDNER, INC.

Madeline German, P.G. Joan A. Smyth, P.G.
Project Geologist Senior Hydrogeologist
[e-mail] [e-mail]

Attachment Figure 1 –Cell 10 GGI Intercept Construction
Figure 2 –Cell 10 GGI Intercept and Monitoring Locations
Figure 3 – Cell 10 Cross-Sections
Attachment A – Piezometer Boring Logs
Attachment B – Groundwater Elevation Graph

cc: Bryan Wuester, SCD
Stacey Smith, P.E. – S+G
File

H:\Projects\Sampson County Disposal\Sampson-16-6 (Cell 10 GGI)\GW monitoring\piezometer installation\Cell 10-GGI
installtion letter.docx
DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08
2/3/2017

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Figures

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DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08
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DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08

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DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08
Client: Sampson County Disposal
Project Number: Sampson 16-6
Site Location: Sampson County Landfill
Boring Location: Cell 10 GGI N448417.04 E2159765.09 Sheet: 1 of 1
Drilling Method: 4.25"HSA Monitoring Well Installed: Yes
Sample Type(s): Boring Diameter: 8.25"Screened Interval: 5 ft - 10ft
Weather: sunny, hot & humid Logged By: MG Date Started: 8/2/16 Depth of Boring: 10 ft
Drilling Contractor: GeoTechnologies, Inc. PA TOC Elevation: 139.17 Date Finished: 8/2/16 Water Level (bgs): at groundsurface
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Date Time
Checked by ________________________Date:________________
Depth to groundwater while drilling
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BORING ID: P-10A
MATERIALS: Color, size, range, MAIN COMPONENT, minor
component(s), moisture content, structure, angularity, maximum
grain size, odor, and Geologic Unit (If Known)
Monitoring Well
Construction Details
DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08
Client: Sampson County Disposal
Project Number: Sampson 16-6
Site Location: Sampson County Landfill
Boring Location: Cell 10 GGI N448171.29 E2159831.28 Sheet: 1 of 1
'Drilling Method: 4.25" HSA Monitoring Well Installed: Yes
Sample Type(s): Boring Diameter: 8.25"Screened Interval: 5 ft - 10ft
Weather: sunny, hot & humid Logged By: MG Date Started: 8/2/16 Depth of Boring: 10 ft
Drilling Contractor: GeoTechnologies, Inc. PA TOC Elevation: 142.39 Date Finished: 8/2/16 Water Level (bgs): 2.84ft
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TD = 10ft
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Date Time
Checked by ________________________Date:________________
Depth to groundwater while drilling
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MATERIALS: Color, size, range, MAIN COMPONENT, minor
component(s), moisture content, structure, angularity, maximum
grain size, odor, and Geologic Unit (If Known)
Monitoring Well
Construction Details
DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08
Client: Sampson County Disposal
Project Number: Sampson 16-6
Site Location: Sampson County Landfill
Boring Location: Cell 10 GGI N447915.46 E2160050.08 Sheet: 1 of 1
Drilling Method: 4.25" HSA Monitoring Well Installed: no
Sample Type(s): Boring Diameter: 8.25"Screened Interval: 5 ft - 10ft
Weather: sunny, hot & humid Logged By: MG Date Started: 8/2/16 Depth of Boring: 10 ft
Drilling Contractor: GeoTechnologies, Inc. PA TOC Elevation: 147.29 Date Finished: 8/2/16 Water Level (bgs): 3.42ft
La
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Grout
1
bright, medium orange brown, mg, SAND, moist
2
3
4 Gravel Pack
5
bright, medium orange brown, mg, SAND, moist
6
7
8
9
10
11
TD = 10ft
12
13
14
15
16
17
18
19
20
Date Time
Checked by ________________________Date:________________
Bentonite
Plug
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BORING ID: P-10C
MATERIALS: Color, size, range, MAIN COMPONENT, minor
component(s), moisture content, structure, angularity, maximum
grain size, odor, and Geologic Unit (If Known)
Monitoring Well
Construction Details
Depth to groundwater while drilling
NOTES:
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DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08
Client: Sampson County Disposal
Project Number: Sampson 16-6
Site Location: Sampson County Landfill
Boring Location: Cell 10 GGI N448096.81 E2160223.78 Sheet: 1 of 1
Drilling Method: 4.25" HSA Monitoring Well Installed: no
Sample Type(s): Boring Diameter: 8.25"Screened Interval: 5 ft - 15ft
Weather: sunny, hot & humid Logged By: MG Date Started: 8/2/16 Depth of Boring: 15 ft
Drilling Contractor: GeoTechnologies, Inc. PA TOC Elevation: 149.12 Date Finished: 8/2/16 Water Level (bgs): 7.95ft
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Grout
1
medium yellow brown into bright orange brown, mg, SAND, moist
2
3
4
5
med tan to grey white, mg, SAND some clay, moist
6
7 Gravel Pack
8
9
10
11 grey white, mg, SAND, wet
12
13
14
15
16
17
18
TD = 15ft
19
20
Date Time
Checked by ________________________Date:________________
Bentonite
Plug
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BORING ID: P-10D
MATERIALS: Color, size, range, MAIN COMPONENT, minor
component(s), moisture content, structure, angularity, maximum
grain size, odor, and Geologic Unit (If Known)
Monitoring Well
Construction Details
Depth to groundwater while drilling
NOTES:
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DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08
Client: Sampson County Disposal
Project Number: Sampson 16-6
Site Location: Sampson County Landfill
Boring Location: Cell 10 GGI N448376.19 E21600080.22 Sheet: 1 of 1
Drilling Method: 4.25" HSA Monitoring Well Installed: no
Sample Type(s): Boring Diameter: 8.25"Screened Interval: 5 ft - 10ft
Weather: sunny, hot & humid Logged By: MG Date Started: 8/2/16 Depth of Boring: 10 ft
Drilling Contractor: GeoTechnologies, Inc. PA TOC Elevation: 146.32 Date Finished: 8/2/16 Water Level (bgs): 7.63ft
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Grout
1
medium yellow orange, mg, SAND
2
3
4 Gravel Pack
5
bright, medium orange yellow, mg, SAND, moist
6
7
8
9
white to light grey, mg, SAND, wet
10
11
TD = 10ft
12
13
14
15
16
17
18
19
20
Date Time
Checked by ________________________Date:________________
Bentonite
Plug
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BORING ID: P-10E
MATERIALS: Color, size, range, MAIN COMPONENT, minor
component(s), moisture content, structure, angularity, maximum
grain size, odor, and Geologic Unit (If Known)
Monitoring Well
Construction Details
Depth to groundwater while drilling
NOTES:
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DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08
Client: Sampson County Disposal
Project Number: Sampson 16-6
Site Location: Sampson County Landfill
Boring Location: Cell 10 GGI N448010.26 E2160410.14 Sheet: 1 of 1
Drilling Method: 4.25" HSA Monitoring Well Installed: no
Sample Type(s): Boring Diameter: 8.25"Screened Interval: 5 ft - 15ft
Weather: sunny, hot & humid Logged By: MG Date Started: 8/2/16 Depth of Boring: 15 ft
Drilling Contractor: GeoTechnologies, Inc. PA TOC Elevation: 154.23 Date Finished: 8/2/16 Water Level (bgs): 10.96ft
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Grout
1
medium red brown, fg to mg, SILTY SAND, damp
2
3
4
5
light brown to light grey brown, mg, SAND, moist
6
7 Gravel Pack
8
9
10
11 tan to light grey white, mg, SAND, wet
12
13
14
15
16
17
18
TD = 15ft
19
20
Date Time
Checked by ________________________Date:________________
Bentonite
Plug
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BORING ID: P-10F
MATERIALS: Color, size, range, MAIN COMPONENT, minor
component(s), moisture content, structure, angularity, maximum
grain size, odor, and Geologic Unit (If Known)
Monitoring Well
Construction Details
Depth to groundwater while drilling
NOTES:
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DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08
Client: Sampson County Disposal
Project Number: Sampson 16-6
Site Location: Sampson County Landfill
Boring Location: Cell 10 GGI N448225.90 E2160430.26 Sheet: 1 of 1
Drilling Method: 4.25" HSA Monitoring Well Installed: no
Sample Type(s): Boring Diameter: 8.25"Screened Interval: 5 ft - 15ft
Weather: sunny, hot & humid Logged By: MG Date Started: 8/2/16 Depth of Boring: 15 ft
Drilling Contractor: GeoTechnologies, Inc. PA TOC Elevation: 152.18 Date Finished: 8/2/16 Water Level (bgs): 9.45ft
La
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Grout
1
medium orange brown, mg, SAND, moist
2
3
4
5
med tan to light brown, mg, SAND some clay, moist
6
7 Gravel Pack
8
9
10
11 med orange tan, mg, SAND, wet
12
13
14
15
16
17
18
TD = 15ft
19
20
Date Time
Checked by ________________________Date:________________
Bentonite
Plug
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BORING ID: P-10G
MATERIALS: Color, size, range, MAIN COMPONENT, minor
component(s), moisture content, structure, angularity, maximum
grain size, odor, and Geologic Unit (If Known)
Monitoring Well
Construction Details
Depth to groundwater while drilling
NOTES:
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DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08
Client: Sampson County Disposal
Project Number: Sampson 16-6
Site Location: Sampson County Landfill
Boring Location: Cell 10 GGI N4448195.01 E2160738.95 Sheet: 1 of 1
Drilling Method: 4.25" HSA Monitoring Well Installed: no
Sample Type(s): Boring Diameter: 8.25"Screened Interval: 10 ft - 20ft
Weather: sunny, hot & humid Logged By: MG Date Started: 8/1/16 Depth of Boring: 20 ft
Drilling Contractor: GeoTechnologies, Inc. PA TOC Elevation: 148.46 Date Finished: 8/1/16 Water Level (bgs): 16.74
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Grout
1
medium brown, fg to mg, SILTY SAND
2
3
4
5
med red orange brown,fg to mg, SILTY SAND, dry
6
7 Gravel Pack
8
9
10 bright yellow orange, mg, SAND, damp
11
12
13
14
15
white grey, mg, SAND, increasing moisture
16
17
18
19
20 TD = 20'
Date Time
Checked by ________________________Date:________________
BORING ID: P-10H
MATERIALS: Color, size, range, MAIN COMPONENT, minor
component(s), moisture content, structure, angularity, maximum
grain size, odor, and Geologic Unit (If Known)
Monitoring Well
Construction Details
Depth to groundwater while drilling
NOTES:
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Bentonite
Plug
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DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08
Client: Sampson County Disposal
Project Number: Sampson 16-6
Site Location: Sampson County Landfill
Boring Location: Cell 10 GGI N448011.50 E2160784.92 Sheet: 1 of 1
Drilling Method: 4.25" HSA Monitoring Well Installed: no
Sample Type(s): Boring Diameter: 8.25"Screened Interval: 5 ft - 15ft
Weather: sunny, hot & humid Logged By: MG Date Started: 8/1/16 Depth of Boring: 15 ft
Drilling Contractor: GeoTechnologies, Inc. PA TOC Elevation: 157.16 Date Finished: 8/1/16 Water Level (bgs): dry
La
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Grout
1
medium brown, fg to mg, SILTY SAND
2
3
4
5
med red brown, mg, CLAYEY SAND, damp
6
7 Gravel Pack
8
9
10
11 bright yellow orange, mg, SAND, moist
12
13
14
peach SAND interbedded with white SAND, wet
15
16
17
18
TD = 15ft
19
20
Date Time
Checked by ________________________Date:________________
Bentonite
Plug
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BORING ID: P-10I
MATERIALS: Color, size, range, MAIN COMPONENT, minor
component(s), moisture content, structure, angularity, maximum
grain size, odor, and Geologic Unit (If Known)
Monitoring Well
Construction Details
Depth to groundwater while drilling
NOTES:
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DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08

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DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08

Attachment 2
DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08

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DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08
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8/1/2016 8/31/2016 9/30/2016 10/30/2016 11/29/2016 12/29/2016 1/28/2017
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Date
Cell 10 Piezometers Water Levels
and Target Elevations for GGI System
p10-a
P-10a Target
P-10b
P-10b Target
P-10C
P-10c Target
P-10d
P-10d Target
P-10e
P-10e Target
P-10f
P-10f Target
P-10g
P-10g Target
p-10h
P-10h Target
P-10i
P-10i Target
Precipitation (in)
Note:
1) Target Elevations are
4 ft. below proposed
subgrade
2) Data retrieval from
KCTZ - Sampson County
Airport
DocuSign Envelope ID: E5D5FE5B-76B8-4075-871F-A018320A8C08