1302_CabarrusCo_CDLF_PH3CQAReport_DIN27575_20170331

4600 Park Rd, Suite 240
Charlotte, NC 28209
tel: [phone]
fax: [phone]
March 28, 2017

Mr. Allen Gaither, P.E.
Environmental Engineer II
North Carolina Department of Environmental Quality
Division of Waste Management
Solid Waste Section
Asheville Regional Office
2090 U.S. Highway 70
Swannanoa, North Carolina 28778

Subject: Construction Quality Assurance Report
Cabarrus County C&D Landfill Phase 3 Unlined Expansion
Cabarrus County, North Carolina
Facility Permit No. 1302-CDLF-2006

Dear Mr. Gaither:
The purpose of this letter is to transmit one copy of the Construction Quality Assurance (CQA)
Report for the Cabarrus County C&D Landfill Phase 3 Expansion project.
CDM Smith provided oversight and general services during construction such as clarification of
design and construction issues and coordination and review of CQA testing. Shield Engineering, Inc.
provided CQA field and laboratory testing services during Phase 3 expansion construction.
Construction of the landfill expansion area was generally performed in accordance with the Solid
Waste Management Rules, conditions of the facility permit, and permit documents prepared by
CDM Smith.
This letter also serves as the certification statement required by Solid Waste Management Rule
.0541. To the best of my knowledge, information and belief, construction of the Cabarrus C&D
Landfill Phase 3 Expansion project was completed in general conformance with:
The approved CQA Plan
The conditions of the Permit to Construct
The requirements of Rule .0541
Acceptable engineering practices

Mr. Allen Gaither, P.E.
March 28, 2017
Page 2
Should you have any questions or comments, or require additional information for your review,
please do not hesitate to contact me at [phone].
Very truly yours,

Martin D. Sanford, P.E., BCEE
Project Engineer
CDM Smith Inc.

cc: Kevin Grant, Cabarrus County
Mat Colone, CDM Smith
Bridget Wlosek, CDM Smith

i
Table of Contents

Section 1 Introduction
Section 2 Earthwork
2.1 General... ............................................................................................................................................................ 2-1
2.2 Site Preparation ............................................................................................................................................. 2-1
2.2.1 Overview .............................................................................................................................................. 2-1
2.2.2 Clearing, Grubbing and Organic Material Removal ............................................................ 2-1
2.2.3 Proofrolling ......................................................................................................................................... 2-1
2.3 Filling/Embankment Construction ....................................................................................................... 2-2
2.3.1 Fill Materials ....................................................................................................................................... 2-2
2.3.2 Fill Plancement and Testing ......................................................................................................... 2-2
Section 3 Record Drawings
Section 4 Hydrogeologic Conditions

Appendices
Appendix A – Shield CQA Report
Appendix B – As-Built Topographic Survey
Appendix C – Piezometer and Monitoring Well Abandonment Records
Appendix D – Progress Reports

List of Figures
Figure 3-1 As-Built Plan and Cross Sections.............................................................................................. 3-2

Table of Contents

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1-1
Section 1
Introduction
The Cabarrus County (County) disposal facility is located off of Irish Potato Road in Concord, North
Carolina. A Permit to Construct (Permit No. 13-02-CDLF-2006) was issued by the North Carolina
Department of Environmental Quality (NCDEQ) Solid Waste Section on January 27, 2017 for the Phase
3 lateral expansion. The Phase 3 expansion has a filling area of approximately 3.4 acres, consisting of a
2.2-acre expansion area and 1.2-acre piggyback area on the existing southern slope of Phase 2.
A pre-construction meeting was held on February 3, 2017 with the County, CDM Smith, Darrell Cody
and Sons Grading, LLC, and Concord Engineering Services (CESI) to discuss the construction activities,
field engineering and testing, communications, and as-built drawings. The Phase 3 construction was
completed in approximately five weeks. Construction activities began on February 8, 2017 and
substantial completion was reached on March 16, 2017.
This report summarizes Construction Quality Assurance (CQA) services performed during the Phase 3
construction and provides complete CQA documentation for the Cabarrus County C&D Landfill – Phase
3 Expansion Project. This report contains daily field reports, in-place field density test results,
conformance test results, and discussions of the test results and procedures used during Phase 3
construction, which can be broken down into the following critical elements:
Landfill foundation/subgrade preparation
Containment berm construction
Drainage ditch installation
Phase 3 was constructed in accordance with North Carolina Solid Waste Rules, Rules 15A NCAC
13B.0540 and .0541; and, the approved Cabarrus County C&D Landfill Substantial Amendment and
Phase 3 Permit to Construct Application dated January 2017. The components of Phase 3 addressed
within this report are as follows:
Section 2 – Earthwork (all earthwork performed associated with the Phase 3 area)
Section 3 – Record Drawings
Section 4 – Hydrogeologic Conditions
Documentation compiled throughout the construction of the landfill, which append the above sections,
is provided in Appendices A through D of this report as outlined below:
Appendix A – Shield CQA Report
Appendix B – As-Built Topographic Survey
Appendix C – Piezometer and Monitoring Well Abandonment Records
Appendix D – Progress Reports
Section 1 • Introduction

1-2
The parties involved in the construction, testing, and construction observation services and their
respective roles are summarized in the following table.
Party Role
Cabarrus County Owner
Darrell Cody and Sons Grading,
LLC
Contractor hired by the County to perform the
construction work.
CDM Smith Engineering consultant – provided general services during
construction such as clarification of design and
construction issues and coordination and review of CQA
testing.
Shield Engineering, Inc. (Shield) CQA independent testing laboratory – retained by CDM
Smith to conduct CQA testing of soils.
Concord Engineering Services
(CESI)
Surveyor hired by the County to provide project layout
and control services, and prepare record drawings.

2-1
Section 2
Earthwork
2.1 General
General Contractor Darrell Cody and Sons Grading, LLC (Contractor) performed all aspects of landfill
construction. CDM Smith retained Shield to conduct CQA observation and field testing for the project.
Earthwork conducted for the Phase 3 construction included site preparation, excavation, fill
placement, and installation of drainage ditches including a 24-inch RCP culvert. The total construction
area, including all of the features listed, was approximately 2.5 acres.
CQA observation and field testing were performed during earthwork activities by Shield to document
conformance with the project specifications. Shield’s CQA Testing Report is located in Appendix A.
This report contains a summary of the CQA testing performed, laboratory test data for the
conformance testing of the excavated materials, and daily CQA reports documenting construction
activities and in-place density testing.
Based on observations, testing, and review of the certified subgrade elevation surveys provided by
CESI, the Phase 3 compacted soil subgrade and other related earthwork activities as noted above have
been completed in general accordance with the Permit to Construct and the plans and specifications.
2.2 Site Preparation
2.2.1 Overview
Preparation of the site consisted of clearing and grubbing, removal of topsoil and other organic
materials, soil excavation, proof-rolling, drainage ditch installation, and containment berm
construction.
2.2.2 Clearing, Grubbing, and Organic Material Removal
The clearing, grubbing, and removal of topsoil and other organic materials prior to excavation and fill
placement was performed by the Contractor to assure that the soil surfaces were generally free of
organic matter and other objectionable materials. A Shield representative examined the exposed soil
subgrade prior to placement of any fill.
2.2.3 Proof-rolling
Proof-rolling was performed on the excavated landfill subgrade and the containment berm area.
Shield observed the proof-rolling prior to select fill placement of the containment berm. Proof-rolling
was performed using a fully-loaded Volvo A25D and/or Caterpillar 725 articulated dump truck. The
landfill subgrade and containment berm area appeared to be firm during proof-rolling.
2.3 Filling/Embankment Construction
2.3.1 Fill Materials
The Phase 3 south containment berm required approximately 3,500 cubic yards of fill materials. The
excavated soil from the 2.2-acre expansion area was utilized for the construction of the south
Section 2 • Earthwork

2-2
containment berm. Three samples of the potential fill soils were tested by Shield for particle size
analyses (ASTM D422), Atterberg limits determinations (ASTM D4318), and moisture-density
compaction tests (ASTM D698). The results of these conformance laboratory tests indicated that the
materials generally consisted of brownish-tan silty sand to medium brown sandy silt and met the
specification requirements for select fill. The laboratory test results are included in Appendix A.
2.3.2 Fill Placement and Testing
The specification requirements for fill placement are as follows:
In-Place Density – compacted to a minimum of 95% of the maximum dry density of the soil as
determined in accordance with ASTM D698.
Moisture Content – within 5% of the optimum moisture content as determined in accordance
with ASTM D698.
Loose Lift Thickness – 12-inch maximum.
Select fill materials were specified for the containment berm and were generally placed in 12-inch-
thick loose lifts and compacted with a sheepsfoot vibratory roller. Fill placement was observed by a
Shield technician. The fill soils were checked to verify the absence of topsoil, roots, and other
deleterious materials. Lift thicknesses were monitored to verify that adequate compaction was
achieved.
The Shield technician performed in-place field density tests to evaluate the compaction (percent of
maximum dry density) of the fill soils. One-point Proctor tests were performed in the field to assist the
field technician in establishing the maximum dry density of the fill being placed. Drive-cylinder
method (ASTM D2937) was used to perform the in-place field density tests. Moisture conditioning was
performed by a water truck, which was requested by the Shield Technician after initial compaction
tests did not pass the percent of maximum dry density. The water truck was kept full-time at the site
and utilized, when needed, while additional compaction tests were performed.
In-place field density tests were generally performed on every lift of fill at a minimum frequency of
one test per 10,000 square feet of fill placed, as required by the CQA plan. Shield performed a total of
20 passing compaction tests during the placement of the select fill material. If the test results indicated
in-place density of the fill was less than the required minimum percentage of maximum dry density as
determined by ASTM D698, the lift of fill was re-worked, and then re-tested. Re-working the fill
consisted of performing additional passes with the sheepsfoot vibratory compactor and moisture
conditioning the soil prior to compaction. The results of the in-place field density tests are included in
the daily CQA reports included in Appendix A.

3-1
Section 3
Record Drawings
The County retained CESI to perform surveying services during the Phase 3 landfill expansion
construction. CESI provided the following services: earthwork grading stakes, control points,
temporary benchmarks, and an as-built topographic survey. CESI was also on-site during different
stages of work to provide direction regarding the construction limits and elevations of the earthwork
in accordance with the approved permit drawings.
The as-built topographic survey provides a record of the completed construction of the Phase 3
landfill expansion disposal area. The as-built survey provides information regarding the elevation and
limits of the Phase 3 landfill expansion footprint, containment berm, and other aspects of the work.
CDM Smith has reviewed the as-built topographic survey and found the completed construction work
to be generally in accordance with the approved Permit to Construct drawings. Figure 3-1 shows
cross-sections through the Phase 3 expansion areas that compare the as-built topography to the
permitted grading. The cross-sections show constructed grades higher than permitted design grades
except a small area on the west side slope. This estimated 2,000 square foot area is approximately
3inches below permitted grade.
The containment berm and perimeter ditches were constructed generally in accordance with the
permit to construct drawings. Due to an error in the topographic survey used during design, one side
slope of the east perimeter ditch was required to be steepened from a 3:1 (horizontal to vertical) side
slope to a 2:1 side slope. Steepening the slope prevented the contractor from cutting into the existing
perimeter access road. The change in side slope was discussed and approved with the NCDEQ Solid
Waste Section and Land Quality Section before construction proceeded.
The as-built survey has been certified by a professional land surveyor currently licensed in the State of
North Carolina. The certified survey is included in Appendix B.

Section 3 • Record Drawings

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XREFs: [] Images: []Last saved by: KOSKIAR Time: 3/27/2017 10:44:04 AME:\CAD\1278-58730-cabarrus\Ramp & Slope Survey-2017\PROP-AS BUILT.dwg
Section 4 • Hydrogeologic Conditions

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Appendix A
Shield CQA Report
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LIQUID LIMIT
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0.0 SANDY SILT(ML)
Specimen Identification
ATTERBERG LIMITS' RESULTS
Fines Classification
36 36 NP 53
H:\GEO-ENVIRONMENTAL (0120)\LAB\LAB GINT\2017\1170031-01_CABARRUS COUNTY LANDFILL.GPJS-33/7/2017 9:38:15 AM
Shield Project No.: 1170031-01
Cabarrus County Landfill
(CDM Smith)4301 Taggart Creek RoadCharlotte, NC 28208Telephone: [phone]
Toll Free: 800-395-5220Fax: [phone]
Concord, North Carolina
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Specimen Identification
Specimen Identification
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PI Cc
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Classification
D10
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60
fine
HYDROMETERU.S. SIEVE OPENING IN INCHES
SANDY SILT(ML) 36
0.0 47.0 53.0
%Sand %Silt %Clay
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COBBLES GRAVEL SAND SILT OR CLAY
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GRAIN SIZE DISTRIBUTION
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U.S. SIEVE NUMBERS
H:\GEO-ENVIRONMENTAL (0120)\LAB\LAB GINT\2017\1170031-01_CABARRUS COUNTY LANDFILL.GPJS-33/7/2017 9:38:15 AM
Shield Project No.: 1170031-01
Cabarrus County Landfill
(CDM Smith)4301 Taggart Creek RoadCharlotte, NC 28208Telephone: [phone]
Toll Free: 800-395-5220Fax: [phone]
Concord, North Carolina
Appendix B
As-Built Topographic Survey
Appendix C
Piezometer and Monitoring Well
Abandonment Records
Appendix D
Progress Reports
Cabarrus County C&D Landfill
Phase 3 Expansion
Progress Report (February 8 – 24, 2017)

Project commenced on February 8, 2017
Summary of Work Completed:
• Silt fences installed
• Site surveyed and grade stakes installed
• Rough grading began
• Excavating began
• CDM Smith Engineers on site 2/17 to review progress and discuss the need to shift berm and
ditch in (westward). This was due to the surveyor having a different topo than the one CDM was
using.
• Construction of south berm has begun (water added to soil per Shield Engineering). Last lift will
be completed on 2/24.
• CDM Smith Engineer was on site 2/24 to review progress and inspect storm water pond and soil
staging area.
Staffing:
• Darrell Cody & Sons: (3 employees)
• Shield Engineering (1 employee)
• Cabarrus County (1 employee)
• CDM Smith (2 employees)
Equipment Used:
• CAT 325 Excavator
• CAT D5 Bulldozer
• CAT 25 YD Dumptruck
• Volvo 25 YD Dumptruck
• Sheepsfoot Roller
• Water Truck

Weather: Unseasonably warm and dry. Rain recorded on 2/9 (0.50 inches), 2/15 (0.25 inches). No
construction work performed on 2/15. No other impact to construction activities.

Project commenced on February 8th.

February 9 – Vegetation removed.

February 10 – Remainder of silt fence installed. Excavation continues.

February 13 – Excavation work

February 16, 17 – Excavation of northwest corner of expansion area. Begin work on berms.

February 20, 21 – Continue with excavation.

February 22 – Shield Engineering on site to test moisture and compaction on south berm.

February 23 – South berm nearing completion, excavation continues

February 24 – Last lift on south berm completed.

Cabarrus County C&D Landfill
Phase 3 Expansion
Progress Report (February 27 – March 7, 2017)

Summary of Work Completed:
• Excavation continues
• Drainage ditch on south berm completed
• Work on final slope grades
• Work continued on drainage ditch and check dams installed
• CDM Smith Engineers on site 2/24 and 3/2 to review progress

Staffing:
• Darrell Cody & Sons: (3 employees)
• Cabarrus County (1 employee)
• CDM Smith (2 employees)
• Concord Engineering (1 employee)
Equipment Used:
• CAT 325 Excavator
• CAT D5 Bulldozer
• CAT 25 YD Dumptruck
• Volvo 25 YD Dumptruck

Weather: Rain recorded on 2/28 (0.1 inches), 3/1 (0.75 inches). No major impact to construction work.

February 28

March 1

March 2

March 3

March 7

Cabarrus County C&D Landfill
Phase 3 Expansion
Progress Report (March 8 – March 16, 2017)

Summary of Work Completed:
• Excavation continues
• Work on final slope grades
• Concord Engineering on site to confirm grades; begin survey work for as built drawing
• Drainage ditch completed, drainage pipe, rip rap and check dams installed
• Berms and drains seeded and matted
• Monitoring wells drilling began on 3/9
• Samples taken from wells on 3/14
• Sub grade inspected and approved on 3/9
• CDM Smith Engineers on site 2/24 and 3/2 to review progress
• Major construction work completed on 3/16

Staffing:
•• Darrell Cody & Sons: (3 employees)
• Cabarrus County (1 employee)
• CDM Smith (3 employees)
• Concord Engineering (2 employees)
• EPDS – Monitoring Wells (2 employees)
Equipment Used:
• CAT 325 Excavator
• CAT D5 Bulldozer
• CAT 25 YD Dumptruck
• Volvo 25 YD Dumptruck

Weather: Rain recorded on 3/8 (0.15 inches), 3/12 (1.0 inch – snow), 3/14 (0.75 inches). No major
impact to construction work.

March 8
Hydroseeding

March 9
Monitor well drilling

Drainage Ditch

March 10

March 13

March 16