3612_Duke_Allen_RequestInstallInstrumentation_DIN27825_20170512

526 South Church Street:
Mail Code EC13K
Charlotte, North Carolina 28202
704-382-4761

May 12, 2017

North Carolina Department of Environmental Quality
Division of Waste Management
Solid Waste Section
2090 U.S. Highway 70
Swannanoa, North Carolina 28778

Attn: Mr. Larry Frost

Re: Retired Ash Basin (RAB) Ash Landfill
Request to Install Instrumentation
Permit No.: 3612-INDUS
Allen Steam Station
Gaston County
Belmont, North Carolina 28012

Dear Mr. Frost,

As previously discussed, Duke Energy plans to install a number of piezometers, inclinometers, and
settlement plates in and around Cell 2B of the Retired Ash Basin (RAB) Ash Landfill at Allen Steam
Station (Permit No. 3612-INDUS). As shown on Figure 1 of the attached Work Plan, two piezometers
and two inclinometers will be installed along the crest of the Retired Ash Basin Dam east of Cell 2B. A
piezometer and inclinometer will be installed north of Cell 2B, and another inclinometer will be installed
south of Cell 2B. Within the footprint of the RAB Ash Landfill Cell 2B, two settlement plates will also
be installed. An associated benchmark will be established north of Cell 2B, and a total of eight survey
monuments will be established within the footprints of Cell 1 and Cell 2A.

Attached for your review, you will find the Work Plan prepared by AECOM Engineering, Inc. related to
this proposed work. If found acceptable, Duke Energy would appreciate concurrence from the Division
of Waste Management concerning these plans prior to commencing project activities. A similar work
plan was also submitted to NCDEQ Dam Safety on April 13, 2017 for review and approval of piezometer
and inclinometer installation.

If there are any questions regarding these plans, please contact me at [phone].

Respectfully Submitted,
Sean DeNeale
Environmental Services

Cc (via e-mail): Ed Mussler, NCDEQ
Steve Pulley, Duke Energy
Kyle Baucom, Duke Energy
Scott Harris, Duke Energy
Ed Sullivan, Duke Energy

John Volk, AECOM Engineering, Inc.

Attachments: Work Plan (prepared by AECOM Engineering, Inc.)

May 11, 2017

Mr. Sean DeNeale
Duke Energy
526 South Church Street
Charlotte, NC 28202

Re: Geotechnical Instrumentation Installation Work Plan
Retired Ash Basin Allen Steam Station – Retired Ash Basin (ALL-600) Gaston County, North Carolina

Dear Mr. DeNeale:

As requested by Duke Energy (Duke), AECOM has prepared this Geotechnical Instrumentation Installation Work Plan (Work Plan) for the proposed installation of
piezometers, inclinometers, and settlement platforms/ monuments located in and
around the Allen Retired Ash Basin (RAB) Ash Landfill (Permit Number 3612-INDUS-
2008). The proposed piezometers and inclinometers and settlement platforms are to be
installed to monitor the pore pressures and lateral deformations of the dam as related to
the dry stack landfill ash placement west of the dam.

1.0 Introduction

This work plan has been prepared by and the scope of work will be performed under
the direction of John C. Volk, P.E., a Professional Engineer registered in the State of
North Carolina [identified as the Engineer of Record (EOR)]. The EOR will be
responsible for observation of the piezometer and inclinometer installation as
necessary to ensure compliance with the Work Plan.
2.0 Schedule

The projected schedule for the piezometer and inclinometer and settlement platform
installation is below:
• Start Date: To be determined
• Duration: 3 to 4 weeks
3.0 Proposed Instrumentation Installation Activities

Two piezometers (GASTO-016-PZ-2B-1 and GASTO-016-PZ-2B-2) and two
inclinometers (GASTO-016-I-2B-2 and GASTO-016-I-2B-3) are proposed on the crest
of the Allen Retired Ash Basin Dam east of the Retired Ash Basin (RAB) Ash Landfill
Cell 2B. The location of the proposed piezometers and inclinometers are shown on
Figure 1. One additional piezometer (GASTO-016-PZ-2B-3) is proposed north of the
RAB Ash Landfill Cell 2B. Two additional inclinometers are proposed – one north of

Page 2 of 3
Cell 2B (GASTO-016-I-2B-3) and one south of Cell 2B (GASTO-016-I-2B-1). Two
settlement platforms will be installed in the footprint of Cell 2B (GASTO-016-SP-2B-1
and -2). Eight survey monuments will be installed on the capped surface portion of the
RAB Ash Landfill in Cells 1 and 2A.

Details of the piezometer and inclinometer and settlement platform installation are
presented on Figure 2. A geologic cross-section of the dam embankment is presented
on Figure 3. The instrumentation installation specification is also attached.

Piezometers will be installed in accordance with 15A NCAC 02C .0108 Standards of
Construction: Wells Other Than Water Supply. Drilling will be performed by a North
Carolina licensed well drilling contractor in accordance with 15A NCAC Chapter 27 –
Well Contractor Certification Rules.

3.1 Piezometer Installation

The piezometers, which are screened in the overburden materials, will be installed
using hollow-stem auger or rotary drilling techniques. Threaded 2-inch diameter
Schedule 40 PVC pipe will be installed with a 10-foot long slotted section bearing at
the tip elevation. Filter sand will be placed around the PVC pipe and the borehole and
will extend a minimum of one to two feet above the screen. A minimum two foot thick
bentonite seal will be placed above the sand filter pack and screen. The bentonite will
be hydrated with potable water. Cement-bentonite grout will be placed above the
bentonite seal in the annular space between the PVC casing and the borehole and
extend to the ground surface.

The piezometer will be protected with a 6-inch steel protective casing and an above-
grade lockable cover. Protective bollards will also be installed. Following completion,
the piezometer will be locked and the ID tag will be affixed to the above-grade cover.

The newly installed monitoring well will be developed to create an effective filter pack
around the well screen and to remove fine particles within the well from the formation
near the borehole.

3.2 Inclinometer Installation

The inclinometers will be installed using hollow-stem auger or rotary drilling
techniques. The inclinometer pipe is 3.34-inch diameter ABS pipe. Cement-bentonite
grout will be placed in the annular space between the casing and the borehole and
extend to the ground surface.

The inclinometer will be protected with a 6-inch steel protective casing and an above-
grade lockable cover. Protective bollards will also be installed. Following completion,
the inclinometer will be locked and the ID tag will be affixed to the above-grade cover.

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3
DISTANCE (FT)
120 160 200 240 280 3208040
REFER TO BORING
LOGS FOR N-VALUES
B-13
EL. 618.7
RAB ASH
78.5'
EOB @ 81.0'
47'
DIKE II
DIKE I
SAPROLITE
EL. 576.0
44'
52'
DIKE II
REFER TO BORING
LOGS FOR N-VALUES
ALLUVIUM
URS-3-S B-14
EL. 624.7
540
580
620
540
580
620
640
600
560
640
600
560
EL
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T
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B-15
EL. 621.4
78.5'
45'
EOB @ 45.0'
OW-20
EL. 624.8
47'
OW-10
EL. 624.8
79'
CPT-19
EL. 624.8
URS-4-B
EL. 622.8
45'
50'
APPROX. EXISTING LANDFILL GRADE
PI
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Z
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CROSS SECTION A-A'
RAB EAST DIKE (ALL-600)
DWG SIZE REVISIONDRAWING NO.
FILENAME:
12.0" x 18.0"
ARCH B
ALLEN STEAM STATIONNOTES:
1. BORINGS/SOUNDINGS SHOWN ON THIS SECTION HAVE BEEN
PROJECTED AND THEIR LOCATION IS APPROXIMATE.
2. STRATIGRAPHIC BOUNDARIES ARE APPROXIMATE AND ASSUME
LINEAR INTERPOLATION BETWEEN BORINGS/SOUNDINGS;
ACTUAL CONDITIONS MAY BE DIFFERENT.
LEGEND:
FILL
ALLUVIUM
RESIDUUM/SAPROLITE
ASH
ALN_C907.002.004
A'A
A A'
FIGURE 4
Fig_3_RAB-East Section (Volk)1.dwg JR
JCV
GRB
TFP
3/15/17
Page 1
SECTION 02095
GEOTECHNICAL INSTRUMENTATION
PART 1 GENERAL
1.1 SCOPE
The Contractor shall furnish, install, and maintain geotechnical instrumentation. The Contractor shall work with the ash placement Contractor to protect instrumentation from damage.
1.2 REFERENCES
The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the
basic designation only.
ASTM INTERNATIONAL (ASTM)
ASTM A 53 (2007) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
ASTM C 778 (2006) Standard Specification for Standard
Sand
1.3 QUALIFICATIONS OF CONTRACTOR’S INSTRUMENTATION PERSONNEL
Geotechnical instrumentation work involves highly specialized tasks. The Contractor's instrumentation personnel who are responsible for furnishing and installing all geotechnical instrumentation and maintaining instrumentation, as required, shall have the qualifications
specified herein. These personnel may be on the staff of the Contractor or
may be on the staff of a specialist instrumentation subcontractor.
A.The Contractor's instrumentation personnel shall include a qualified
Geotechnical Instrumentation Engineer who is a registeredProfessional Engineer in the State of North Carolina, who has aminimum of a Bachelor of Science degree in civil engineering, and who
has at least 4 years of experience in installation and monitoring
of the types of instruments specified herein and in interpretinginstrumentation data and has a minimum of three similar instrumentationprojects over the last five years.B.The Geotechnical Instrumentation Engineer shall:1.Prepare detailed step-by-step procedures for all instruments
specified herein.2.Be on site and supervise at least the first two
installations of each type of instrument.3.Be on-site until the completion and acceptance tests for at
least the first two of each type of instrument specified herein.4.Supervise interpretations of initial geotechnical instrumentationdata.
C.The Contractor's instrumentation personnel shall include aSuperintendent who will be in responsible charge full-time on site

Page 2
during the geotechnical instrumentation program. The Superintendent shall have at least 4 years of direct field experience in installation and monitoring of the types of instrumentation specified herein, and
shall have supervised instrumentation programs of similar magnitude in similar subsurface conditions. The Superintendent shall:
1. Be on-site and supervise all instrument installations, and pre-installation and post-installation acceptance tests, after the Geotechnical Instrumentation Engineer has performed these three
tasks for the first two of each instrument type. D . The Contractor's instrumentation personnel including the Geotechnical Instrumentation Engineer, the Superintendent, Registered Land Surveyor, field party chief, and all other field
office personnel shall have qualifications acceptable to the Engineer. If requested by Duke Energy, the Contractor shall replace any person in the position of Geotechnical Instrumentation
Engineer, Instrumentation Superintendent, or Registered Land Surveyor who fails to properly perform their required tasks as defined herein.
1.4 MEASUREMENT AND PAYMENT
1.4.1 Measurement A. Geotechnical Instrumentation will be measured by each instrument,
complete in place as delineated in the drawings. Furnishing and installing instrumentation will be measured as follows:
1. Piezometer - vertical, by each complete installation. Provide protective exterior casing. 2. Settlement plate, by each complete installation.
3. Survey monument, by each complete installation. 4. Inclinometer casing, by each complete installation. Provide protective exterior casing. 5. Benchmark, by each complete installation.
6. Bollards, by each complete installation.
1.4.2 Payment
A. The Contract prices for furnishing readout units shall be full compensation for the following materials, including factory calibrations, pre-installation acceptance testing. Instruction manuals, and delivery as specified. Furnishing the following will be paid for at
Contract unit prices each:
1. Inclinometer: probe, carrying case, cable, and readout unit (1 each) 2. Inclinometer software
(1 each) B. The Contractor prices for furnishing and installing each instrument shall be full compensation for all materials left in
place, all cable, labor, tools, and equipment, instruction manuals,
drilling, sampling, pre-installation acceptance testing, installation, post-installation acceptance testing, installation of surface and other protection, obtaining formal initial reading and determination of as-built location. Furnishing and installing instrumentation will be paid for at

Page 3
the contract unit prices as follows: 1. Settlement plates for each plate, to include initial
installation plus 30 feet of pipe (for each settlement platform) in 5 feet lengths which will be added to the
settlement platform by the Owner as the ash level is increased. 2. Inclinometer casing, for each installation, with exterior
protective casing. 3. Piezometer, for each installation. 4. Survey monument, for each installation. 5. Benchmark, for each installation.
6. Bollards, for each installation.
1.5 PURPOSE OF GEOTECHNICAL INSTRUMENTATION PROGRAM
Purposes of the Geotechnical Instrumentation Program include but are not limited to: 1. Monitoring of ground movement during construction of Retired Ash Basin landfill. 2. Providing a warning of unforeseen conditions that may require
remedial or precautionary measures.
1.6 RESPONSIBILITIES OF CONTRACTOR A. Furnish all components of geotechnical instrumentation required by the Contract. B. Furnish portable readout units for the Owner’s use. C. Install instruments specified in the Contract. D. Follow Owner and Station’s, Health, Safety and Environmental Requirements.

1.7 SUBMITTALS SD-01 Preconstruction Submittals
Contractor Personnel resumes Within 10 calendar days after Notice to Proceed, submit to the Owner for review:
1. Resumes of Geotechnical Instrumentation Engineer, Superintendent, and Registered Land Surveyor sufficient to
define details of relevant site experience. 2. Resumes of other field and office geotechnical
instrumentation personnel to be assigned to the project,
other than clerical staff. 3. Proposed equipment and products for all instrumentation.
Name, make, product name and details of installation. 4. Drillers valid North Carolina Drilling License.

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SD-03 Product Data
Manufacturer Information
Within 5 Workdays of receipt of each instrument at the site, submit to the Owner a copy of manufacturer's calibration and test
equipment certification, completed copy of quality assurance checklist, and warranty for each portable readout unit. SD-05 Design Data
Contractor Installation Plan
At least 15 calendar days prior to commencing installation of the first of each type of instrument, submit to the Owner for review
the following items pertaining to that instrument type: 1. Detailed step-by-step procedure for installation, together with a sample installation record sheet. The
procedures shall be bound and indexed. The installation procedures shall include: a. The method to be used for cleaning the inside of casing or
augers. b. Specifications for proposed grout mixes, including
commercial names, proportions of admixtures and water, mixing sequence, mixing methods and duration, pumping methods and tremie pipe type, size and quantity. c. Drill casing or auger type and size. d. Depth increments for backfilling boreholes with sand
and granular bentonite. e. Method for overcoming buoyancy of instrumentation
components during grouting. f. Method of sealing joints in pipes and inclinometer casing to prevent ingress of grout.
h. Method for protecting instruments from damage. 2. A schedule indicating the proposed time sequence of instrument
installation. 3. Sample of the quality assurance checklist, pre-installation
acceptance test record, installation record for each instrument type to be used to check instruments on receipt from the manufacturer.
SD-06 Test Reports
Instrumentation Testing Within 5 Days of installing each instrument, submit to the Owner
the installation record sheet for that instrument, including as-built instrument location as specified and post-installation acceptance testing.

Page 5
SD-07 Certificates
Instrumentation Calibration
A factory calibration shall be conducted on all instruments prior to shipment to the Site. Certification shall be provided to
indicate that the test equipment used for this purpose is calibrated and maintained in accordance with the test equipment manufacturer's calibration requirements and that, where applicable, calibrations are traceable to the National
Institute of Standards and Technology. SD-11 Closeout Submittals
As-Built Plans
The Contractor shall submit to the Owner updated as-built instrument location plans within one week of the completion of installation of each instrument.
1.8 SCHEDULING WORK
Install instruments and agree on formal initial readings in accordance with the following schedule:
A. Piezometers shall be installed and formal initial readings. B. Inclinometers shall be installed and formal initial readings. C. Settlement platforms and survey monuments shall be installed and formal initial readings.
D. Variations in this schedule require the prior review and acceptance by the Owner. 1.9 SHIPMENT AND STORAGE

All instrumentation materials, after receipt at the site and prior to installation, shall be stored in an indoor, clean, dry, and secure storage space in accordance with the manufacturer’s recommendations. Instruments shall not be exposed to temperatures outside the manufacturer's
recommendations for working temperature range, nor should they be allowed to freeze. PART 2 PRODUCTS

2.1 MATERIALS A. All materials shall be new. B. Whenever any product is specified by brand name and model number,
such specifications shall be deemed to be used for the purpose of establishing a standard of quality and facilitating the description of the product desired. The term "acceptable equivalent" shall be understood to indicate that the "acceptable
equivalent" product is the same or better than the product named
in the specifications in function, performance, reliability, quality, and general configuration. This procedure is not to be construed as eliminating from competition other suitable products of equal quality by other manufacturers. The

Page 6
Contractor may, in such cases, submit complete comparative data to the Engineer for consideration of another product. Substitute products shall not be ordered, delivered to the site, or used in
the Work unless accepted by the Owner in writing. The Owner will be the sole judge of the suitability and equivalency of the
proposed substitution. C. Any request from the Contractor for consideration of a substitution shall clearly state the proposed alternative, the nature of the
deviation from the product specified and the reason for the deviation requested. The Contractor also provide documentation supporting the claim of "acceptable equivalence". D. Specified readout units, together with associated calibration
devices and software, shall be furnished to the Engineer no later than one week before commencing installation of the first of each type of instrument. In addition to specified readout
units for the Owner's use when collecting data, the Contractor shall provide Contractor's own readout units as needed for
making pre-installation and post-installation acceptance tests, for taking any required readings during installation, and for taking additional readings required by the Contractor during the course of the Work. Such readout units shall be identical to the
specified readout units. E. The Contractor shall furnish all installation tools, materials, and miscellaneous instrumentation components
necessary to install the required instrumentation in a fully functional state.
F. The Contractor shall provide surface protection to each instrument to protect the instrument from damage by the elements, vandals and the Work activities. The Contractor shall submit proposed protection methods and measures to be used
for review and acceptance by the Owner at least 10 days prior to the start of installation. The Contractor shall maintain and repair all surface protection measures for the duration of the Contract.
G. For each instrument type, provide an instruction manual which
shall include the following: 1. A description of the purpose of the instrument. 2. Theory of operation. 3. Step-by-step procedures for:
a. Pre-installation acceptance test when instruments are received on site, to ensure the instruments are functioning correctly prior to installation. b. Calibration of readout units.
4. A list of calibration equipment required, and recommended frequency
of calibration. 5. Step-by-step instrument installation procedure including materials, tools, spare parts, and any borehole requirements, and post-installation acceptance tests.
6. Maintenance procedure. 7. Step-by-step data collection procedure. 8. Data reduction, processing, and plotting procedures. 9. Manufacturer’s requirements for all of the above.
H. All measurements, dimensions and units shall be in U.S. Customary
Units, for example, feet, inches, pounds.

Page 7
2.2 PIEZOMETERS A. Provide piezometers as 2-inch diameter Schedule 40 PVC threaded pipe.
B. Provide 10 feet screened length of No. 20 screen.
C. Filter sand shall conform to ASTM C-778, Standard Specification for Standard sand, or No. 20-40 sand. D. Granular bentonite shall be Enviroplug Medium, as manufactured by Wyo-
Ben, Inc., Billings, MT, or Holeplug, as manufactured by Baroid Divison, Petroleum Services, Inc., Houston, TX, or acceptable equivalent. D. Special grout Type A shall consist of uniform sized fine ground or powdered non-drilling mud grade bentonite, for use in sealing and
grouting well casings. A polymer-based thixotropic additive may also be added to the mix if recommended by the manufacturer. E. Cylindrical sounding hammer shall be a steel cylinder with outside
diameter 0.3 to 0.5 inch less than the inside diameter of the casing or augers, an inside diameter 0.15 to 0.25 inch larger than the outside
diameter of the cable, a length of not less than 2 feet, and a weight of 10 to 20 pounds. 2.3 SURVEYING INSTRUMENTS AND BENCHMARKS FOR SETTLEMENT PLATFORM MONITORING
A. Instruments used for vertical deformation monitoring shall have a minimum accuracy of ± 1.5 mm (standard deviation for one kilometer of
double run leveling) and a minimum setting accuracy of ± 1.0 arc seconds. Leveling staffs shall be non-telescopic in design (i.e., `Chicago' style
leveling staff). A bull's eye bubble shall be used to plumb the leveling rod. B. Contractor shall establish one benchmark that is founded below ground as shown in the Drawings. This benchmark shall be grouted Schedule 40 PVC
pipe, at least 3 inches in diameter. 2.4 SETTLEMENT PLATES

Contractor shall provide settlement plates in accordance with details in drawings. Provide 2 inch and 4 inch standard steel pipe, threaded and coupled, ASTM A 53, Grade B in 5 foot lengths.
2.5 INCLINOMETERS A. Provide inclinometer casing, probe, cable, readout unit, and accessories, as manufactured by Slope Indicator Co., Seattle, WA or
acceptable equivalent.
B. Inclinometer casing shall be 3.34 inch O.D. ABS or acceptable equivalent with broached internal keyways, and twist tolerance better than one degree per 10 foot length. Standard couplings shall be utilized. C. Probe shall be model 50302500 as manufactured by Slope Indicator Co., or
acceptable equivalent. Probe shall be biaxial, consisting of two force balance accelerometers mounted at 90 degrees, with a 2 foot wheelbase. Probe shall be supplied in a carrying case. D. Cable shall be 150 feet long, shall be sheathed with neoprene, and shall
have vulcanized rubber markers, and an internal wire rope core. Minimum
cable O.D. shall be 0.4 inch. E. Readout unit shall be Digitilt Datamate as manufactured by Slope Indicator Co, or acceptable equivalent. The time interval between recordings two feet apart in the casing shall be such that the reading

Page 8
stabilizes to within ± 1 unit of display within 8 seconds. Readout unit shall include a battery charger. F. Provide accessories, consisting of end caps, tools, and materials for
attaching couplings and taking readings. G. Provide inclinometer software, D1G1PRO, latest version, as supplied by
Slope Indicator Company, or acceptable equivalent. H. Cement grout shall be Type III Portland cement and water. Special grout Type B shall include- cement, bentonite, and water, and shall have
approximately similar shear strength and compressibility as the surrounding ground. A trial mix with unconfined compressive strengths shall be submitted prior to installation. I. Surface protection shall be 6 inch diameter steel casing at least 6.5
feet in length with locking cap. This will allow attachment of cable support assembly, or shall allow for an inclinometer casing extension while readings are being taken. The length of the inclinometer
casing shall not vary by more than 0.05 inches between sets of readings.
2.6 FACTORY CALIBRATION A. A factory calibration shall be conducted on all instruments at the
place of manufacture prior to shipment. Each factory calibration shall include a calibration curve with data points clearly indicated, and a tabulation of the data. Each instrument shall be marked with a
unique identification number. B. Factory calibrations of inclinometers shall include comprehensive
calibrations of the force balance accelerometers prior to assembly in the probe. A final calibration shall include measurements made at 10 degrees intervals from –30 degrees to +30 degrees with respect to vertical, and a comprehensive repeatability check over +1- 5
degrees of vertical. PART 3 EXECUTION
3.1 PRE-INSTALLATION ACCEPTANCE TESTS A. When instruments are received at the site, the Contractor's
instrumentation personnel shall perform pre-installation acceptance tests to ensure that the instruments and readout units are functioning correctly prior to installation. Pre-installation acceptance tests shall include relevant items from the following list: 1. Examine factory calibration curve and tabulated data, to verify completeness. 2. Examine manufacturer's final quality assurance inspection check list, to verify completeness. 3. Check cable length. 4. Check tag numbers on instrument and cable. 5. Check, by comparing with procurement document, that model, dimensions, and materials are correct. 6. Bend cable back and forth, at point of connection to instrument,
while reading the instrument, to verify connection integrity. 7. Verify that all components fit together in the correct configuration. 8. Check all components for signs of damage in transit. 9. Check that quantities received correspond to quantities ordered. B. During pre-installation acceptance testing of each instrument,

Page 9
the Contractor's instrumentation personnel shall complete a pre-installation acceptance test record form. C. An instrument that fails the specified pre-installation acceptance
test shall be repaired such that it passes a subsequent pre-installation acceptance test, or shall be replaced by an identical instrument at no additional cost to the Owner.
3.2 INSTALLATION – GENERAL A. Contractor shall perform utility locate in the instrument location for
a distance of not less than 25 feet in all directions. In addition, the initial 5 feet shall be vacuum excavated or hand-excavated; unless
approved by the Owner. B. The Contractor's instrumentation personnel shall install instruments in accordance with the Contractor's detailed step-by-step procedures and reviewed by the Owner. C. Installation procedures for instruments in boreholes shall be such that
all steps in the procedure can be verified. Granular bentonite shall be placed in depth increments not exceeding 2 feet. Volumes of each
increment of backfilling with sand shall be small enough that no bridging of bentonite occurs. The depth to the top of each instrument with sand or granular bentonite shall be checked after placement. D. Grout shall be placed using a tremie method with side discharge ports on the tremie pipe. E. Prior to installing any instrument through drill casing or augers, all material adhering to the inside of the casing or augers, and all cuttings, shall be removed thoroughly. F. Whenever withdrawing drill casing or augers during instrument installation in a borehole, care shall be taken to minimize the length
of unsupported borehole and the rate of casing or auger withdrawal.
Collapse of the borehole shall not be allowed to occur. Backfill material shall not be allowed to build up inside the casing or auger such that the instrument is lifted as the casing or auger is withdrawn. The casing or auger shall be withdrawn without rotation. G. The Contractor shall notify the Owner at least 72 hours prior to installing each instrument. H. The Owner will be responsible to extend the settlement platforms as necessary as grade changes occur. The Contractor will supply the materials (5 feet lengths and couplings) for these extensions as
noted earlier. I. As each instrument is installed, an installation record sheet shall be
prepared, including appropriate items from the following list: 1. Project name. 2. Contract name and number. 3. Instrument type and number, including readout unit.
4. Planned location in horizontal position and elevation. 5. Planned orientation. 6. Planned lengths and volumes of backfill.
7. Personnel responsible for installation. 8. Plant and equipment used, including diameter and depth of any drill casing or augers used. 9. Date and time of start and completion. 10. Spaces on record sheet for necessary measurements or readings
required at hold points during installation to ensure that all

Page 10
previous steps have been followed correctly, including instrument readings made during installation. 11. A log of subsurface data indicating the elevations of strata
changes encountered in the borehole. 12. Type of backfill used. 13. As-built location in horizontal position and elevation including: a. Elevation referenced to the Project Elevation Datum, together with the location of the point used for the
elevation measurement. b. Horizontal position referenced both to North Carolina
Plane Grid Coordinates, as referenced to the North
American Datum of 1983 (NAD 83), and to project Baseline Station and Offset, together with the location of the point used for horizontal position measurement. c. A location sketch showing the instrument number, taped horizontal ± 1 foot from permanent physical features in the
field. A sufficient number of taped measurements shall be included on the sketch to establish a unique horizontal
position for the instrument. If such features are removed, the Contractor shall provide a new sketch, prior to removal, with taped measurements to other features. 14. As-built orientation.
15. As-built lengths and volumes of backfill. 16. Result of post-installation acceptance test. 17. Weather conditions at the time of installation. 18. A space on record sheet for notes, including problems
encountered, delays, unusual features of the installation, and
details of any events that may have a bearing on instrument behavior. J. An instrument that fails the specified post-installation acceptance test
shall be replaced by an identical instrument at no additional cost to the Owner.
3.3 INSTALLATION OF PIEZOMETERS
A. Piezometers shall be installed at the locations and depths shown on
the Plans or as directed by the Owner. B. Maintain an open hole with casing or hollow-stem augers. Bentonitic
drilling mud shall not be used. C. For vertical installations, the Contractor shall sample every five feet with split spoons and every 10 feet with 3-inch dia Shelby tubes for
each piezometer installed. The Shelby tubes will be provided to the Owner. D. Install threaded pipe sections of screened and unscreened pipe.
E. Depth to the top of each increment of granular bentonite shall be checked using a cylindrical sounding hammer. The granular bentonite
shall not be tamped. F. After completion of installation, post-installation water levels shall be
performed to verify that the piezometer functions correctly. G. After completion of installation, the as-built location in the horizontal position shall be determined to an accuracy of ± 1 foot, and the
elevation of the top of the roadway box to an accuracy of ± 0.01 foot. The elevation of the piezometer diaphragm shall also be determined, to an accuracy of ± 0.1 foot. H. Install four bollards around each instrument.

Page 11
I. Piezometers shall be developed to create an effective filter pack around
the well screen and to remove fine particles within the well from the formation near the borehole.
3.4 INSTALLATION OF SETTLEMENT PLATES AND SURVEY MONUMENTS A. Settlement platforms shall be installed at the locations shown on the plans or as directed by the Owner. B. The settlement platforms shall be placed two foot below existing grade
and the ash placed on top of the platform shall be compacted with a hand-held compactor (jumping jack or plate tamper). C. After completion of installation, determine as-built location in horizontal position to an accuracy of ± 1 foot and the elevation per
NAVD88 of the top of the 2 inch pipe to an accuracy of ± 0.01 foot. D. As the height of fill increases, the Owner will extend the 2 inch pipe
upward in 5 foot increments, to maintain top of pipe between 1 and 6
feet above embankment surface. When extending pipe, do not rotate pipe already in place. Record extension length to an accuracy of ± 0.005 foot. Survey the elevation of the inner pipe just before and immediately after adding the inner pipe extension so a new reference
can be established. E. The landfill operator shall work in a manner in the active landfill
areas to prevent damage to the settlement platforms. F. Ash placed within four feet of the settlement platforms shall be compacted with hand-held compaction equipment (jumping jack or plate
tamper). 3.5 INSTALLATION OF INCLINOMETERS A. Inclinometer casings shall be installed at the locations and depths shown on the Plans or as directed by the Owner. After installation, no part of the casing shall deviate from vertical by more than 4 percent
of the depth to that part. The bottom of the casing shall be a minimum of 15 feet below the top of the dense sand. B. The Contractor shall sample every five feet with split spoons and every
10 feet with 3-inch dia Shelby tubes with a piston sampler for each inclinometer installed. The Shelby tubes will be provided to the Owner. C. Correct casing groove orientation shall be maintained throughout
installation. Once installed the casing cannot be rotated to align the grooves. D. Standard couplings shall be installed. E. After completion of installation, a post-installation acceptance test
shall be performed to verify that there is no grout in the inclinometer casing, that groove orientation and verticality are correct, and that the inclinometer probe tracks correctly in all four orientations. F. After completion of installation, the as-built location in
horizontal position shall be determined to an accuracy of ± 0.03 foot, and the elevation of the top of the inclinometer casing to an accuracy
of ± 0.01 foot (per NAVD88 datum). The point selected to determine horizontal position shall be marked on the casing and indicated on the installation record sheet.

Page 12
3.6 FIELD MAINTENANCE The Contractor's instrumentation personnel shall conduct regular maintenance
of field terminals and accessible instrument components.
3.7 DAMAGE TO INSTRUMENTATION The Contractor shall protect all instruments and components of
instrumentation systems from damage while the installation is being performed. Settlement platforms in the active ash basin are the responsibility of the Owner coordinating with the ash placement Contractor.
3.8 DISPOSITION OF INSTRUMENTS
Portable readout units furnished to the Owner for data collection shall become the property of the Owner.

-- End of Section --
26.2
30.2
21.7
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Red-orange, sandy SILT (ml), fill
Medium to stiff, dry to slightly moist, red to light brown, ClayeySILT (ml), fill
Dry to wet, gray, FLY ASH
Medium, orange, Silty CLAY (cl), fill
Stiff, slightly moist, orange-red, Sandy Lean CLAY (CL), tracequartz cobbles, fill
Stiff to very stiff, slightly moist to moist, red to red-orange, SandyFat CLAY (CH), trace gravel, fill
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Date(s)Drilled
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09/30/2014
SamplingMethod(s)Automatic
Drill RigType DrillingContractor
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Ryan Doyle, EITCheckedBy
4.25" ID HSA
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Sheet 1 of 2
21.1
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End of Boring at 62´ bgs
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Sheet 2 of 2
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GEXDiedrich D-120
DrillingMethod Total Depthof Borehole
Grout
622.8 ft above msl
Drill BitSize/Type
Kevin Arnold
117.0´ bgs
SPT, Shelby Tubes
Date(s)Drilled
GroundwaterLevel(s)
10/01/2014
SamplingMethod(s)Automatic
Drill RigType DrillingContractor
LoggedBy
SurfaceElevation
BoreholeBackfill HammerData
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4.25" ID HSA
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8

A
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Project Number: 31835141
Project: Duke Energy
Sheet 1 of 4
35.48Hard, wet, red to brown to gray, CLAY (cl), trace fine sand,residuum
558.8 64.0
14 17
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MATERIAL DESCRIPTION
Nu
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REMARKS AND
OTHER DETAILS
Re
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,

%
Log of Boring URS-4-Ba
590
585
580
575
570
565
560
30
35
40
45
50
55
60
65
Project Location: Allen
Re
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3
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4
8

A
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Project Number: 31835141
Project: Duke Energy
Sheet 2 of 4
35.4
20.6
13.8
13.6
15.6
LL=NP PL=NP PI=NP%G=0.0 %S=51.1%M=44.8 %C=4.1%F=48.9
121517
681216
102250/6"
14243634
16202322
19243150/2"
24
Very stiff, wet, white and gray, fine Silty SAND (SM), trace clay,residuum
Hard, fine Sandy Clayey SILT (ml), saprolite
Hard, reddish-brown, fine to medium Sandy SILT (ml), saprolite
Hard, moist, white to gray to tan, coarse Sandy SILT (ml), saprolite
Very dense, wet, orange and brown, coarse SAND (sc), trace clay,partially weathered rock
553.8
548.8
547.8
538.8
528.8
69.0
74.0
75.0
84.0
94.0
14
15
16
5
17
18
19
20
17
71
75
90
44
50
62
52
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MATERIAL DESCRIPTION
Nu
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REMARKS AND
OTHER DETAILS
Re
c
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r
y
,

%
Log of Boring URS-4-Ba
555
550
545
540
535
530
525
70
75
80
85
90
95
100
Project Location: Allen
Re
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1
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2
3
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4
8

A
M
Project Number: 31835141
Project: Duke Energy
Sheet 3 of 4
12.9
162850/5"
50/5"
50/3"
50/4"
Hard, black to tan to brown, CLAY (cl), brittle, partially weatheredrock
Wet, coarse Gravelly SAND (sw), partially weathered rock
Hard, wet, brown to black to white and gray, coarse Sandy CLAY(cl), partially weathered rock
Very dense, wet, white and gray, coarse SAND (sc), trace clay,partially weathered rock
End of Boring at 117´ bgs
522.3
517.1
513.8
508.8
505.8
100.5
105.7
109.0
114.0
117.0
20
21
22
23
52
100
100
100
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SAMPLES
MATERIAL DESCRIPTION
Nu
m
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REMARKS AND
OTHER DETAILS
Re
c
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r
y
,

%
Log of Boring URS-4-Ba
520
515
510
505
500
495
490
105
110
115
Project Location: Allen
Re
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;

5
/
4
/
2
0
1
5

1
0
:
2
3
:
4
9

A
M
Project Number: 31835141
Project: Duke Energy
Sheet 4 of 4
0 100 200
0
10
20
30
40
50
60
70
80
90
100
110
120
qt (tsf)
De
p
t
h

(
f
e
e
t
)
0.0 2.5 5.0
fs (tsf)
0 5 10
Rf (%)
0 100 200 3000
u (ft)
0 6 12
SBT
URS
Job No: 14-54091
Date: 10:09:14 09:38
Site: Duke Allen Steam Station
Sounding: URS-3-S
Cone: 304:T1500F15U500
Max Depth: 29.750 m / 97.60 ftDepth Inc: 0.050 m / 0.164 ftAvg Int: Every Point
File: 14-54091_SP03.CORUnit Wt: SBT Chart Soil Zones SBT: Lunne, Robertson and Powell, 1997Coords: N: 527670.7 E: 1400464.5 Elev: 626.0Page No: 1 of 1
Undefined
Silty Clay
Silty Clay
ClaySilty ClaySiltUndefinedClay
Clay
Stiff Fine GrainedClayey SiltClay
Stiff Fine GrainedClayUndefinedSandy SiltStiff Fine GrainedSilty Sand/SandClayey SiltClayUndefinedClay
ClayStiff Fine Grained
Silty ClaySilty ClaySandy SiltSilty Sand/Sand
SandSandy SiltClayey Silt
Clay
Silty ClayClay
Clay
Clay
Clay
Silty ClayClayey SiltClayey SiltSilty ClaySilty Clay
SiltClayey SiltClayey SiltClayey SiltStiff Fine GrainedSiltSilt
Silty Sand/SandSandy SiltSandy SiltUndefinedRefusalRefusalRefusalRefusal
Hand Auger Hand Auger Hand Auger Hand Auger