8202_SampsonCoMSWLF_20170505_Cell10GGIFinalReport_DIN27693

May 5, 2017

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

RE: Final Gravity Groundwater Intercept Demonstration – Cell 10
Sampson County Disposal, LLC
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 SCD.
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.

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. (Bentley) mobilizing equipment to the site on July 12, 2016.
The GGI system in the cell was installed as specified using Type GT-S geotextile, 12"
perforated CPE pipe, and No. 57 stone. Cell 10 discharges to the Northern GGI discharge
point to assist the GGI in reducing groundwater elevations to the required separation

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.
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
.
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
5/5/2017
Figures
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691

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DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
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DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
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DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
Attachment A
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
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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TD = 10ft
12
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Date Time
Checked by ________________________Date:________________
Depth to groundwater while drilling
NOTES:
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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: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691
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August, 2016 September, 2016 October, 2016 November, 2016December, 2016 January, 2017 February, 2017 March, 2017 April, 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) Daily precipitation
from CRONOS database,
Sampson County Airport
Station (KCTZ)
DocuSign Envelope ID: 3673F4CF-06EF-4FB5-BB07-DD6C2080A691