3901_Granville_Oxford_MSWLF_Unit2Phase2_WellAbandonment_FID1642226_20220209

GRANVILLE COUNTY OXFORD LANDFILL
UNIT 2- PHASE 2
WORK PLAN FOR
WELL ABANDONMENT AND REPLACEMENT
February 2022
GARIZETT & m0ou EAV!22
Engineering for the Power and Waste Industries
1029 West South Street
Raleigh, NC 27603
919-792-1900

Granville County Oxford Landfill
Work Plan for Well Abandonment and Replacement — Unit 2 Phase 2
1. INTRODUCTION
The Oxford Landfill is located in Granville County approximately 4 miles north of Oxford,
North Carolina at 6584 Landfill Road, near the town of Kinton Fork. The facility is owned
and operated by Granville County under Permit Number 39-01, issued by the North
Carolina Department of Environmental Quality (DEQ) Solid Waste Section (SWS).
The property included in the facility's Site Plan consists of approximately 411 acres,
which includes the 29-acre closed construction and demolition debris (C&D) landfill on
top of a closed MSW landfill (Unit 1) and the adjacent 283-acre active MSW Landfill.
The 283-acre MSW landfill property includes three waste disposal units: Unit 2 (36.3
acres) and permitted Units 3 and 4 (86.7 acres and 33.5 acres, respectively). The first
phase of MSW landfill development (Unit 2, Phase 1) consists of a 10.97-acre waste cell
that began operations in 2014.
The next phase of the MSW landfill, Unit 2 Phase 2 has been investigated to include the
monitoring of groundwater levels within the landfill footprint. The County intends to begin
grading for Unit 2 — Phase 2 starting in Spring 2022, and therefore the existing monitoring
wells / piezometers in the Phase 2 footprint need to be abandoned. Moreover, the
existing groundwater monitoring well MW-3R is located in too close of proximity to the
new Phase 2 unit construction and is proposed to be abandoned and a replacement well
(MW-3RR) located on the other side (west side) of the existing landfill access road.
2. PURPOSE
The purpose of this Work Plan is to provide a plan for the 1) abandonment of the existing
groundwater monitoring wells and piezometers in the Unit 2 Phase 2 construction
footprint, and 2) installation of new replacement well MW-3RR.
3. EXISTING GROUNDWATER MONITORING WELLS & PIEZOMETERS
The existing piezometers and monitoring wells in the proposed Unit 2 — Phase 2 area
and surrounding areas are identified on Figure 1. Figure 1 also identifies the proposed
location for the replacement well MW-3RR. A table summarizing the well construction
details for the existing wells to be abandoned is presented in Table 1 (attached).
Note that while well MW-12 (P-21) is identified as a groundwater monitoring well, it is not
monitored as part of the approved GWMP.
Page 1 of 10

Granville County Oxford Landfill
Work Plan for Well Abandonment and Replacement — Unit 2 Phase 2
4. WORK PLAN FOR WELL ABANDONMENT
A total of 12 groundwater wells / piezometers are to be abandoned, as identified in Figure
1 and Table 1.
The wells / piezometers will be abandoned prior to landfill construction in accordance
with the procedures for permanent abandonment of wells as delineated in 15A NCAC
02C .0113, except that at the time of abandonment, the wells will be over -drilled to the
full depth of the boring or to the top of bedrock, whichever is encountered first, prior to
grout placement. The level of the grout within the well shall not exceed in height the
elevation of the proposed base grade. Well abandonments will be performed by a North
Carolina certified well driller.
Table 2 (attached) presents a summary of the existing wells / piezometers to include the
elevation of the bedrock and proposed landfill base grade and the resulting total linear
footage of over -drilling (ground surface to top of rock) and grouting (bottom of well to
landfill base grade).
Upon completion of the work, a letter report will be submitted to the Division confirming
the abandonment of the wells / piezometers was performed per this Work Plan.
5. WORK PLAN FOR WELL REPLACEMENT / INSTALLATION (MW-3RR)
With regards to groundwater monitoring, the first 2022 semi-annual groundwater
monitoring sampling event will take place prior to well MW-3R abandonment and the
construction of the new MW-3RR. It is anticipated that MW-3RR will be constructed prior
to the second monitoring event taking place. However, in the event that well MW-3R has
been abandoned but well MW-3RR has not yet been constructed prior to the second
2022 semi-annual sampling event, NCDEQ will be notified of the MW-3R/MW-3RR
sampling omission prior to the sampling event. Upon completion of the work, the existing
facility GWMP will be revised to reflect the new MW-3RR location and construction
details.
The well construction record for the existing MW-3R (to be replaced by the proposed
MW-3RR) indicates the boring was advanced 25-feet to the top of bedrock and the well
set at the depth (i.e., no rock coring). The replacement well, MW-3RR, is to be in near
proximity to the existing MW-3R and therefore it is anticipated that the new MW-3RR will
also be of similar well construction (i.e., about 25' deep, with a 10' slotted screen section).
The actual well depth for MW-3RR will be based on site conditions as discussed below.
Page 3 of 5

Granville County Oxford Landfill
Work Plan for Well Abandonment and Replacement — Unit 2 Phase 2
The scope of work includes the following:
1. 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.
2. Drill 1 soil testing boring (MW-3RR) at the approximate location indicated on
Figure 1 using mud -rotary, hollow -stem auger, or other geologist/engineer
approved drilling techniques. The proposed location for MW-3RR is approximate
and may be adjusted based on the site constraints.
3. The boring will be advanced into the saprolite and into the underlying bedrock to
an appropriate depth as determined by the Engineer or Geologist at the time of
boring as necessary to adequately characterize the hydrogeologic conditions and
obtain a sufficient water column for groundwater monitoring.
4. 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.
5. If bedrock coring is necessary, crystalline bedrock samples will be collected using
an HX core barrel.
6. The augers, drill pipe, core barrel and drill rig will be decontaminated using a
pressure washer prior to and following completion of drilling for the project.
7. Complete the testing boring borehole with the installation of a Type II monitoring
well to the requirements of North Carolina DEQ monitoring well standards. The
Type II monitoring well will be constructed of 2-inch ID Schedule 40 PVC well
casing and 10 or 15 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 well will be finished with solid PVC risers extending approximately
2 to 3 feet above grade. The wells will be finished with steel, stickup well
protectors with hinged locking caps. The top of the PVC risers will be fitted with
expansion plugs. An approximately 2 feet by 2 feet by 6-inch thick concrete pad
will be constructed around the base of each protective casing.
Page 4 of 5

Granville County Oxford Landfill
Work Plan for Well Abandonment and Replacement — Unit 2 Phase 2
8. The 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.
9. The well will be surveyed relative to the existing site datum for horizontal position
and elevation by a North Carolina licensed surveyor. At the 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.
10. An experienced geotechnical engineer or geologist will supervise and observe the
boring, visually classify subsurface soil samples encountered in the borings, and
prepare logs of the boring. At their discretion, the geotechnical engineer or
geologist will also select and obtain samples of the subsurface soils encountered
during boring advancement.
11. Collect static water level readings the new monitoring well at the time of boring
and 24-48 hours.
12. Upon completion of the work, a letter report will be submitted to the Division which
includes the well log, survey information, and confirmation that monitoring well
was installed per this Work Plan. As part of the submittal, the existing facility
GWMP will be revised to reflect the new MW-3RR location and construction
details.
Page 5 of 5

Granville County Oxford Landfill
Work Plan for Well Abandonment and Replacement — Unit 2 Phase 2
TABLES 1 & 2

TABLE 1
Borings/Piezometers to be Abandoned
Granville County Oxford Unit 2 Phase 2 Landfill
Well/Piezo
Northing
Easting
Ground
Surface
Elev.
Top of
Casing
Elev.
Screen
Interval
BGS
Screen
Interval
Elev.
Depth to
Bedrock
BGS
Top of
Bedrock
Elev.
Bore/Piezo
Depth
BGS
Bore/Piezo
Bottom
Elev.
P-29
954232.703
2112770.353
506.5
510.62
20.0 '- 30.0'
486.5 - 476.5
20.0'
486.5
30.0'
476.5
P-30S
954111.283
2112826.270
507.0
510.37
25.0'- 35.0'
482.0 - 472.0
27.0'
480.0
35.0'
472.0
P-30D
954115.398
2112818.644
506.9
510.37
50.0'- 60.0'
456.9 - 446.9
27.0'
479.9
60.0'
446.9
P-31
954225.823
2112561.563
516.8
520.25
16.5' - 26.5'
500.3 - 490.3
14.5'
502.3
26.5'
490.3
P-32
954062.925
2112259.145
511.1
515.16
25.0'- 30.0'
486.1 - 481.1
20.5'
490.6
30.0'
481.1
P-33S
954130.103
2112015.673
503.3
505.79
17.0'- 27.0'
486.3 - 476.3
17.0'
486.3
27.0'
476.3
P-33D
954155.029
2112020.410
503.1
506.18
40.0' - 50.0'
463.1 - 453.1
17.0'
486.1
50.0'
453.1
P-34
954184.456
2111737.744
500.8
504.35
24.5' - 34.5'
476.3 - 466.3
23.5'
477.3
34.5'
466.3
P-6
954257.195
2112192.206
502.06
505.06
21.0 '- 31.0'
481.1 - 471.1
10.0
492.06
31.0'
471.1
MW-12 / P-21
954078.314
2112567.506
519.29
521.30
40.0 '- 50.0'
479.3 - 469.3
31.3
488.00
31.0'
488.3
P-12
953759.792
2112443.825
516.37
519.37
35.0'- 55.0'
481.4 - 466.4
5.0
511.37
55.0'
461.4
IL MW-3R
954026.936
2111681.468
495.85
498.35
14.0'- 24.0'
481.8 - 471.8
25.0
470.85
25.0'
470.9

TABLE 2
Abandonment Footages
Granville County Oxford Unit 2 Phase 2 Landfill
Well/Piezo
Ground
Surface
Elev.
Top of
Bedrock
Elev.
Overdrilling
Footage
(LF)
Well/Piezo
Bottom
Elev.
Landfill
Subgrade
Elev.
Grouting
Footage
(LF)
P-29
506.5
486.5
20.0
476.5
500.6
24.1
P-30S
507.0
480.0
27.0
472.0
507.3
35.2
P-30D
506.9
479.9
27.0
446.9
505.5
58.6
P-31
516.8
502.3
14.5
490.3
506.8
16.5
P-32
511.1
490.6
20.5
481.1
502.7
21.6
P-33S
503.3
486.3
17.0
476.3
495.1
18.9
P-33D
503.1
486.1
17.0
453.1
494.6
41.4
P-34
500.8
477.3
23.5
466.3
497.4
31.1
P-6
502.1
492.1
10.0
471.1
496.7
25.6
MW-12 / P-21
519.3
488.0
31.3
488.3
507.5
19.3
P-12
516.4
511.4
5.0
461.4
516.4
55.0
MW-3R
495.9
470.9
25.0
470.9
495.9
25.0
Total (LF) = 237.8 Total (LF) = 372.2