6403_NashCDLF_PTOapplicPh5_20210721

GARRETT /
& MOORE�
Engineering for the Power and Waste Industries
July 20, 2021
Donna Wilson
North Carolina Department of Environment and Natural Resources
Division of Waste Management
Solid Waste Section
1646 Mail Service Center
Raleigh, North Carolina 27699-1646
RE: Nash County C&D Landfill Phase 5 Expansion
Permit No. 6403-CDLF-2000
CQA Certification
Ms. Wilson:
Please find the attached Construction Quality Assurance Report for the Phase 5 portion of the
Nash County C&D Landfill. The required Limit of Waste markers will be placed prior to operation
of Phase 5. Additionally, Nash County is currently installing a 4'-high protective soil berm
between adjacent access roads and the Phase 5 excavation as a safety precaution.
We are requesting immediate approval to operate Phase 5 since available capacity at Nash
County is severely limited at this time.
Thank you for your assistance and consideration. Please do not hesitate to let me know if you
need anything to facilitate your review.
Sincerely,
GARRETT & MOORE, INC.
Craig M. Fortner, P.E.
Project Manager
1029 W. South Street, Raleigh, North Carolina 27603 • O: 919-792-1900 • F: 866-311-7206

Construction Quality Assurance Report
Phase 5
of the
Nash County C&DLF
Permit No. 6403-CDLF-2000
July 21, 2021
GAPLRETT ZAF
& MOORE ffl!221
Engineering for the Power and Waste Industries
1029 W. South Street
Raleigh, North Carolina 27603 • O: 919-792-1900 • F: 866-311-7206
NC FIRM C-2910

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CONSTRUCTION QUALITY ASSURANCE REPORT
PHASE 5 OF THE NASH COUNTY C&DLF
Project Certification:
Based on the observations and results of the CQA program documented herein, it is our
professional opinion that the construction of the Phase 5 expansion of the Nash County
C&DLF was completed in accordance with the following:
The conditions of the Permit to Construct for Phase 5
ii. The approved CQA Plan
iii. The requirements of 15A NCAC 13B .0540
iv. Accepted Engineering practices
``,�►11111i1111110
a
SEAL e
129929
Craig M. Fortner, P.E.
July 20, 2021
Garrett & Moore, Inc.
NC Firm C-2910
Page i

CONSTRUCTION QUALITY ASSURANCE REPORT
PHASE 5 OF THE NASH COUNTY C&DLF
CONTENTS
1.0 INTRODUCTION....................................................................................................... 1
2.0 RESPONSIBILITIES AND AUTHORITIES................................................................ 1
2.1 OWNER................................................................................................................. 1
2.2 ENGINEER/CQA ENGINEER................................................................................ 1
2.3 CONTRACTOR ........................................ ERROR! BOOKMARK NOT DEFINED.
2.4 SURVEYOR........................................................................................................... 1
3.0 INSPECTION ACTIVITIES........................................................................................ 1
3.1 EROSION AND SEDIMENT CONTROL................................................................2
3.2 LANDFILL CELL SUBGRADE CONSTRUCTION ................................................. 2
4.0 RECORD DRAWINGS.............................................................................................. 3
5.0 CONCLUSION..........................................................................................................4
ATTACHMENTS:
1. CONSTRUCTION QUALITY CONTROL RECORDS
2. AS -BUILT SURVEY
3. PHOTOGRAPHS
Page i

This page intentionally left blank

CONSTRUCTION QUALITY ASSURANCE REPORT
PHASE 5 OF THE NASH COUNTY C&DLF
1.0 INTRODUCTION
The Nash County C&DLF is located at 3057 Duke Road, Nashville, North Carolina. A
Permit to Construct for Phase 4-9 of the Nash County C&DLF was issued by the North
Carolina Division of Waste Management (NCDWM) on May 3, 2017.
This Construction Quality Assurance (CQA) Report documents CQA activities performed
during construction of Phase 5 of the Nash County C&DLF. Nash County staff performed
the excavations associated with establishing the Phase 5 base grades during ongoing
C&DLF disposal operations. Figure 1 presents the current topography of Phase 5 with
cross sections illustrating deviation from the permitted Phase 5 base grades.
The Phase 5 area of the Nash County C&DLF as certified herein consists of 2.3 acres
and provides approximately 207,800 cubic yards of airspace.
2.0 RESPONSIBILITIES AND AUTHORITIES
The following parties were involved in the construction and CQA of Phase 4.
2.1 OWNER
Nash County
PO Box 849
Nashville, NC 27856
Contact: William Hill, Nash County Health Director
Phone: [phone]
2.2 ENGINEER/CQA ENGINEER
Garrett & Moore, Inc.
1029 W. South Street
Raleigh, NC 27603
Contact: Craig M. Fortner, P.E.
Phone: [phone]
2.3 SURVEYOR
Sorrell Land Surveying, Inc.
107 Union Drive, Suite 101
Washington, NC 28586
Contact: Hugh Sorrell, PLS
Phone: [phone]
3.0 INSPECTION ACTIVITIES
Inspection activities for Landfill Cell Subgrade Construction included the following:
Page 1 of 4

CONSTRUCTION QUALITY ASSURANCE REPORT
PHASE 5 OF THE NASH COUNTY C&DLF
3.1 EROSION AND SEDIMENT CONTROL
The construction of the erosion and sediment control measures took place in
conjunction with project activities and under the site permits issued by North Carolina
Depart of Environmental Quality (NCDEQ), Division of Energy, Mineral and Land
Resources during Phase 4 C&DLF development. No additional stormwater
infrastructure and erosion and sedimentation controls are required for the operation
of the Phase 5 C&DLF.
3.2 LANDFILL CELL SUBGRADE EXCAVATION
Inspection activities for Landfill Cell Subgrade Construction included:
• Craig Fortner, PE of Garrett & Moore visited the site periodically during
excavation of Phase 5 for the purpose of inspecting disposal cell subgrade
conditions. Mr. Fortner visited the site on the following dates:
o May 20, 2019
o June 17, 2019
o February 11, 2020
o June 24, 2020
o July 9, 2020
o March 4, 2021
o April 29, 2021
o July 7, 2021
• Proof rolling of excavated portions of the cell was observed and documented
by Garrett & Moore staff on July 7, 2021.
• Subgrade soils within 2-feet below the constructed Phase 5 floor were
confirmed to be USCS soil type ML and characterized as dense clayey silt with
isolated '/2" rock fragments by the visual -manual classification method.
• Craig Fortner, PE reviewed the as -built survey point prepared by Sorrell Land
Surveying, Inc. and confirmed the following with respect to the permitted Phase
5 C&DLF base grades:
o Phase 5 floor elevation is higher than the permitted Phase 5 floor,
thereby providing additional separation from the approved seasonal high
water table. See additional discussion in Section 4.
Page 2 of 4

CONSTRUCTION QUALITY ASSURANCE REPORT
PHASE 5 OF THE NASH COUNTY C&DLF
o Phase 5 sideslopes on the southern edge have been excavated beyond
the horizontal extent of the permitted Phase 5 base grades as illustrated
in Figure 1. See additional discussion in Section 4.
Photographs of the Phase 5 base grades are included as Attachment 2 to this
report.
No backfill was required to establish Phase 5.
4.0 ENGINEERING DISCUSSION
4.1 DEVIATION FROM APPROVED GRADES
The final constructed grades of the Phase 5 C&DLF expansion deviate from permitted
grades both vertically and horizontally. As constructed, the Phase 5 grades are higher
than the permitted grades. With the Phase 5 grades remaining higher than the
permitted maximum excavation, additional separation from the approved seasonal
high water table is provided. Figure 1 presents the constructed grades relative
permitted grades and the permitted seasonal high water table.
Figure 1 also illustrates the extent to which Phase 5 was over -excavated horizontally
on the southern portion of Phase 5. The additional horizontal excavation is more steep
relative to the permitted Phase 5 subgrade slopes of 3H:1 V.
4.2 REVISED PHASED 5 AREA AND CAPACITY
Phase 5 as constructed, adds approximately 2.3 acres of disposal footprint and
207,800 CY of disposal capacity. This represents approximately +0.2 acres of
disposal area and +7,800 CY of disposal capacity beyond that recognized in the
Permit to Construct (PTC) for Phase 5. It is noted that the additional Phase 5 disposal
area is completely within the permitted waste footprint illustrated in the approved
Facility Plan.
When considered in conjunction with Phase 4, the total disposal capacity provided
represents a net reduction of the capacity approved in the PTC. Figure 1 presents a
tabulation of the deviation from permitted areas and volumes for Phase 4 and Phase
5.
4.3 SOUTHERN EMBANKMENT STABILITY
Excavation at the southern limit of Phase 5 has resulted in slopes steeper than the
permitted 3H:1 V. As constructed, slopes along this embankment range from near-
0.5H:1 V (with isolated heights of up to 3-feet) to approximately 2H:1 V. The current
condition of the slope is considered temporary, as the initial lift of C&D waste will
buttress the slope.
Page 3 of 4

CONSTRUCTION QUALITY ASSURANCE REPORT
PHASE 5 OF THE NASH COUNTY C&DLF
Stability analysis of the cut slope yields a minimum global factor of safety (FS) of 2.3,
which is considered acceptable for both short-term and long-term conditions. The
slope stability evaluation is included as Attachment 3.
Nash County will install a 4' tall stabilized earthen berm between the access road and
the cut slope as a safety measure against vehicles going off the access road and into
the Phase 5 base grades.
5.0 RECORD DRAWINGS
An as -built subgrade survey for Phase 5 of the Nash County C&D Landfill is shown in
Attachment 1 to this report. Reference is made to Figure 1 which presents the local
context for the as -built survey.
6.0 CONCLUSION
Based on the observations and results of the CQA program documented herein, it is our
professional opinion that the construction of the Phase 5 of the Nash County C&DLF was
completed in accordance with the following:
i. The conditions of the Permit to Construct for Phase 5
ii. The approved CQA Plan
iii. The requirements of 15A NCAC 13B .0540
iv. Acceptable Engineering practices.
Page 4 of 4

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GRADES SHOWN REPRESENT AN ENGINEERING SURVEY PERFORMED ON MARCH 4, 2021. \
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230
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210
200
190
PHASE AND CAPACITY ANALYSIS
PERMITTED FINAL COVER
GRADES
PERMITTED PROPOSED PERMITTED PROPOSED
PHASE PHASE PHASE PHASE
AREA AREA NET DISPOSAL NET DISPOSAL
PHASE (AC) (AC) CAPACITY (CY) CAPACITY (CY)
J
to
PHASE 4 3.7 3.7* 133,000 100,200*
Q
PERMITTED INTERMEDIATE OVER GRADES
PHASE 5 2.1 2.3 200,000 207,800
IL
to
pES
Ep�p,T� pES
RM�
TOTAL 5.8 6.0 333,000 308,000
PERMITTED VALUES FROM APPROVED FACILITY PLAN, TABLE 1.
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PERMITTED
PHASE 4 INTERMEDIATE
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PERMITTED C&DLF HORIZONTAL
---------
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ENGINEERING SURVEY
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MARCH 4, 2021
-
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PHASE 5
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FIGURE
1

CONSTRUCTION QUALITY ASSURANCE REPORT
PHASE 5 OF THE NASH COUNTY C&DLF
ATTACHMENT
AS -BUILT SURVEY

CONSTRUCTION QUALITY ASSURANCE REPORT
PHASE 5 OF THE NASH COUNTY C&DLF
ATTACHMENT
PHOTOGRAPHS

CONSTRUCTION QUALITY ASSURANCE REPORT
PHASE 5 OF THE NASH COUNTY C&DLF
Photo 2 — Proofroll, northwest view
Photographs Page 1 of 3

CONSTRUCTION QUALITY ASSURANCE REPORT
PHASE 5 OF THE NASH COUNTY C&DLF
Photo 3 — Phase 5, northern view from access road
Photographs Page 2 of 3

CONSTRUCTION QUALITY ASSURANCE REPORT
PHASE 5 OF THE NASH COUNTY C&DLF
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Photo 4 — Aerial of Project (March 2021)
Photographs Page 3 of 3

CONSTRUCTION QUALITY ASSURANCE REPORT
PHASE 5 OF THE NASH COUNTY C&DLF
ATTACHMENT
STABILITY ANALYSIS

Nash Co. C&DLF P5 Excavation Global Stability
v:\nash\projects\phase 5 - operations\nash ph5 input.p12 Run By: Craig Fortner, Garrett & Moore, Inc 7/20/2021 02:30PM
# FS
Soil
Soil
Total
Saturated Cohesion Friction
Piez. Load Value
a 2.30
Desc.
Type
Unit Wt.
Unit Wt.
Intercept
Angle
Surface L1 250psf
b 2.45
No.
(pcf)
(pcf)
(psf)
(deg)
No.
c 2.48
Silt
1
110.0
110.0
0.0
26.0
0
d 2.49
PWR
2
120.0
120.0
200.0
34.0
0
e 2.51
C&D
3
60.0
60.0
500.0
25.0
0
f 2.55
g 2.73
h 2.77
i 2.82
2.88
280
240
200
160
120
80
40
0L
0
GARRETT q
&MOORS /
E�gioseri�g io�ths Power and Waste Industries
:j
40 80 120 160 200 240 280 320
PCSTABLSM/si FSmin=2.30
Safety Factors Are Calculated By The Modified Bishop Method
360 400 440

** PCSTABLSM **
by
Purdue University
--Slope Stability Analysis --
Simplified Janbu, Simplified Bishop
or Spencer's Method of Slices
Run Date: 7/20/2021
Time of Run: 02:30PM
Run By: Craig Fortner, Garrett & Moore, Inc
Input Data Filename: V:Nash Ph5 Input.in
Output Filename: V:Nash Ph5 Input.OUT
Unit: ENGLISH
Plotted Output Filename: V:Nash Ph5 Input.PLT
PROBLEM DESCRIPTION Nash Co. C&DLF P5 Excavation
Global Stability
BOUNDARY COORDINATES
9 Top Boundaries
10 Total Boundaries
Boundary X-Left
No. (ft)
1 0.00
2 68.60
3 73.90
4 90.30
5 96.70
6 113.20
7 121.40
8 123.00
Y-Left
X-Right
Y-Right
Soil Type
(ft)
(ft)
(ft)
Below Bnd
208.40
68.60
209.00
2
209.00
73.90
209.70
2
209.70
90.30
209.80
2
209.80
96.70
211.10
2
211.10
113.20
217.50
2
217.50
121.40
223.80
2
223.80
123.00
227.00
2
227.00
123.60
228.12
1

V:\Nash\Projects\Phase 5 - Operations\nash ph5 input.OUT Page 2
9 123.60 228.12 141.90 229.60
1
10 123.00 227.00 141.90 227.00
2
ISOTROPIC SOIL PARAMETERS
3 Type(s) of Soil
Soil Total Saturated Cohesion Friction Pore Pressure
Piez.
Type Unit Wt. Unit Wt. Intercept Angle Pressure Constant
Surface
No. (pcf) (pcf) (psf) (deg) Param.
(psf)
No.
1 110.0 110.0 0.0 26.0 0.00
0.0
0
2 120.0 120.0 200.0 34.0 0.00
0.0
0
3 60.0 60.0 500.0 25.0 0.00
0.0
0
BOUNDARY LOAD(S)
1 Load(s) Specified
Load X-Left X-Right Intensity Deflection
No. (ft) (ft) (psf) (deg)
1 124.00 140.00 250.0
0.0
NOTE - Intensity Is Specified As A Uniformly Distributed
Force Acting On A Horizontally Projected Surface.
A Critical Failure Surface Searching Method, Using A
Random
Technique For Generating Circular Surfaces, Has Been
Specified.
100 Trial Surfaces Have Been Generated.
10 Surfaces Initiate From Each Of 10 Points Equally
Spaced
Along The Ground Surface Between X = 30.00 ft.
and X = 90.00 ft.
Each Surface Terminates Between X = 123.00 ft.
and X = 140.00 ft.
Unless Further Limitations Were Imposed, The Minimum
Elevation
At Which A Surface Extends Is Y = 0.00 ft.
10.00 ft. Line Segments Define Each Trial Failure Surface.
Following Are Displayed The Ten Most Critical Of The
Trial
Failure Surfaces Examined. They Are Ordered -
Most Critical
First.
* * Safety Factors Are Calculated By The Modified
Bishop
Method
Failure Surface Specified By 7 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
1 90.00 209.80
2 99.65 207.16
3 109.64 207.49
4 119.09 210.77
5 127.14 216.69
6 133.09 224.73
7 134.58 229.01
Circle Center At X = 103.5 ; Y = 240.3 and Radius,
33.4
*** 2.302 ***
Individual data on the 14 slices
Water Water Tie Tie
Earthquake
Force Force Force Force
Force
Surcharge
Slice Width Weight Top Bot Norm Tan
Hor
Ver Load
No. (ft) (lbs) (lbs) (lbs) (lbs) (lbs)
(lbs)
(lbs) (lbs)
1 0.3 1.5 0.0 0.0 0.0 0.0
0.0
0.0 0.0
2 6.4 1236.2 0.0 0.0 0.0 0.0
0.0
0.0 0.0
3 2.9 1452.8 0.0 0.0 0.0 0.0
0.0
0.0 0.0
4 10.0 8223.0 0.0 0.0 0.0 0.0
0.0
0.0 0.0
5 3.6 3717.1 0.0 0.0 0.0 0.0
0.0
0.0 0.0
6 5.9 7078.3 0.0 0.0 0.0 0.0
0.0
0.0 0.0
7 2.3 3133.1 0.0 0.0 0.0 0.0
0.0
0.0 0.0
8 1.6 2370.4 0.0 0.0 0.0 0.0
0.0
0.0 0.0
9 0.6 982.8 0.0 0.0 0.0 0.0
0.0
0.0 0.0
10 0.4 662.9 0.0 0.0 0.0 0.0
0.0
0.0 0.0
11 3.1 4769.8 0.0 0.0 0.0 0.0
0.0
0.0 786.2
12 5.9 5560.6 0.0 0.0 0.0 0.0
0.0
0.0 1485.6
13 0.8 274.7 0.0 0.0 0.0 0.0
0.0
0.0 197.9
14 0.7 75.2 0.0 0.0 0.0 0.0
0.0
0.0 175.3
Failure Surface Specified By 8 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
1 83.33 209.76
2 92.63 206.08
3 102.57 204.98
4 112.45 206.54

V:\Nash\Projects\Phase 5 - Operations\nash ph5 input.OUT Page 3
5
121.58
210.63
6
129.30
216.98
7
135.09
225.13
8
136.57
229.17
Circle
Center At X =
101.7 ; Y
= 242.2
***
2.448
***
Failure
Surface Specified By 7
Coordinate
Point
X-Surf
Y-Surf
No.
(ft)
(ft)
1
90.00
209.80
2
99.57
206.90
3
109.55
207.58
4
118.64
211.73
5
125.68
218.84
6
129.75
227.97
7
129.79
228.62
Circle
Center At X =
102.7 ; Y
= 234.5
***
2.483
***
Failure
Surface Specified By 7
Coordinate
Point
X-Surf
Y-Surf
No.
(ft)
(ft)
1
83.33
209.76
2
93.19
208.09
3
103.17
208.82
4
112.68
211.90
5
121.18
217.17
6
128.18
224.31
7
130.77
228.70
Circle
Center At X =
95.2 ; Y
= 249.7
***
2.487
***
Failure
Surface Specified By 9
Coordinate
Point
X-Surf
Y-Surf
No.
(ft)
(ft)
1
76.67
209.72
2
86.12
206.47
3
96.04
205.19
4
106.02
205.94
5
115.63
208.68
6
124.50
213.31
7
132.25
219.62
8
138.58
227.37
9
139.65
229.42
Circle
Center At X =
97.4 ; Y
= 254.6
***
2.505
***
Failure
Surface Specified By 8
Coordinate
Point
X-Surf
Y-Surf
No.
(ft)
(ft)
1
90.00
209.80
2
99.07
205.59
3
109.00
204.37
4
118.82
206.27
5
127.58
211.09
6
134.43
218.37
7
138.72
227.40
8
138.98
229.36
Circle
Center At X =
107.9 ; Y
= 236.2
***
2.553
***
Failure
Surface Specified By 9
Coordinate
Point
X-Surf
Y-Surf
No.
(ft)
(ft)
1
83.33
209.76
2
91.90
204.60
3
101.59
202.12
4
111.58
202.50
5
121.04
205.74
6
129.19
211.54
7
135.32
219.44
8
138.95
228.76
9
139.00
229.37
Circle
Center At X =
105.3 ; Y
= 236.5
and Radius, 37.3
Points
and Radius, 27.8
Points
and Radius, 41.6
Points
and Radius, 49.4
Points
and Radius, 31.9
Points
and Radius, 34.6

V:\Nash\Projects\Phase 5 - Operations\nash ph5 input.OUT Page 4
*** 2.728
***
Failure
Surface Specified By 8
Coordinate Points
Point
X-Surf
Y-Surf
No.
(ft)
(ft)
1
90.00
209.80
2
98.62
204.73
3
108.42
202.73
4
118.34
204.00
5
127.31
208.40
6
134.38
215.48
7
138.78
224.46
8
139.41
229.40
Circle
Center At X =
109.5 ; Y
= 232.8 and Radius, 30.1
***
2.771
***
Failure
Surface Specified By 10
Coordinate Points
Point
X-Surf
Y-Surf
No.
(ft)
(ft)
1
70.00
209.18
2
79.13
205.11
3
88.89
202.94
4
98.89
202.74
5
108.73
204.54
6
118.01
208.25
7
126.38
213.73
8
133.48
220.77
9
139.05
229.08
10
139.17
229.38
Circle
Center At X =
94.9 ; Y
= 252.6 and Radius, 50.0
***
2.816
***
Failure
Surface Specified By 9
Coordinate Points
Point
X-Surf
Y-Surf
No.
(ft)
(ft)
1
83.33
209.76
2
91.57
204.08
3
101.10
201.08
4
111.10
201.01
5
120.68
203.89
6
128.99
209.45
7
135.30
217.21
8
139.04
226.48
9
139.29
229.39
Circle
Center At X =
106.3 ; Y
= 234.3 and Radius, 33.6
***
2.881
***