6403_NashCoCDLF_Phase4Exp_DIN28202_20170629

1100 Crescent Green Dr., Suite 208, Cary, North Carolina 27529 • O: 919-792-1900 • F: 866-311-7206
June 29, 2017
Ms. Christine Ritter Hydrogeologist NCDEQ Solid Waste Section, Permitting Branch 217 W Jones St. Raleigh, NC 27603

Via e-mail

RE: Nash County C&D Landfill
Phase 4 Expansion
Abandonment & Well Installation Work Plan

Dear Ms. Ritter:
Nash County is preparing to break ground on construction of the recently permitted
Phase 4 Expansion of the existing C&D Landfill. In accordance with the approved
Monitoring Plan dated January 2017, the following Work Plan describes the methods
and procedures to be used to abandon existing groundwater monitoring wells and
piezometers and install new permanent groundwater monitoring wells associated with
Phase 4.
Development of the Phase 4 Expansion footprint requires the following abandonments
and installations, as described below:
Well Abandonment
ID Depth (ft) Grout To (ft,
BGS)
MW-6 42 10
P-16D 43 12
P-20S 30 12
P-20D 50 12
P-26 45 8
Total 210

Ms. Christine Ritter June 29, 2017 Page 2 of 3

Well Installation
ID Anticipated Screen
(ft, BGS)
MW-6R N/A(1)
MW-7 8-18
MW-8 20-30
(1)MW-6R will be installed at existing location P-21S
Existing piezometers and existing MW-6 scheduled for abandonment are shown on
Figure 1. Existing piezometers installed within the Phase 4 expansion footprint will be
abandoned by overdrilling and tremie grouting to within 2 feet of the permitted
expansion subgrade. The ungrouted portion of the abandonment below permitted
subgrade will be backfilled with bentonite chips. The remainder of the boring will be
backfilled with soil cuttings to ground surface.
Proposed monitoring wells approved in the Monitoring Plan are shown on Figure 1.
MW-7, and MW-8 will be Type II monitoring wells will be installed using a hollow-stem
auger drilling rig. Existing piezometer P-21S, which was installed as a Type II
piezometer, will be redeveloped and designated MW-6R in accordance with the
approved Monitoring Plan.
All Type II groundwater monitoring wells will be constructed of 2-inch ID Schedule 40
PVC well casing and 10 feet of machine-slotted well screen with 0.010” slots. A sand
pack will be emplaced within the annular space to approximately 2 feet above the top of
the well screen, above which a 2-foot thick bentonite seal will be installed. The annular
space will be finished with Portland cement/bentonite slurry to grade. The monitoring
wells will be finished with solid PVC risers extending approximately 2 to 3 feet above
grade within steel stickup protective casings with hinged, locking lids. All groundwater
monitoring wells will be installed and constructed in accordance with North Carolina
Well Standards.
Prior to initiating field work, North Carolina 811 will be contacted to have underground
utilities in the areas proposed for drilling appropriately marked. All drilling locations will
also be approved by the client prior to drilling.
Ms. Christine Ritter June 29, 2017 Page 3 of 3
Soil samples will be collected at each drilling location for lithologic descriptions using the
standard penetration test (SPT) method with a 140-lb sliding hammer and steel split-
spoon samplers. Samples will be collected in 2-feet intervals for every five feet of depth
to the completion depth of the boring. The soil retained in each split-spoon sampler will
be logged by an engineer or geologist with respect to texture, composition, color, and
moisture content. In addition, one soil sample collected from the saturated zone at each
drilling location will be retained and submitted for grain size analysis at a geotechnical
laboratory to allow for estimating the specific yield of the aquifer sediments. Additional
soil index testing will be performed on select samples to further characterize site soils.
The augers, drill pipe and drill rig will be decontaminated using a pressure washer prior
to drilling at each location. Split-spoon samplers will be decontaminated prior to and
following each use with a non-phosphate soap and water wash followed by multiple
rinses with distilled water. Each well will be developed after installation using a down
hole pump or bailer until the discharge water appears to be free of suspended
sediments or for a maximum of one hour.
Each well will be surveyed relative to the existing site datum for horizontal position and
elevation by a North Carolina licensed surveyor. At each well, elevations will be
measured of the ground surface and top of the solid PVC riser. A permanent mark will
be made on the top of the PVC riser at the point where the elevation measurement is
made for future reference when collecting depth to water data.
Your assistance on this project is greatly appreciated. We look forward to any
questions or comments you may have.
Sincerely,
Garrett and Moore, Inc.

Craig M. Fortner, P.E.

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