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3612_Duke_Allen_RequestInstallInstrumentation_DIN27825_20170512526 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 (704) 382-4761. 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. SP-2B-1 S B - 2 B - 2 M-1A-1M-2A-3 M - 1 A - 2 M - 2 A - 4 M - 1 B - 2 M - 2 A - 2 M-2A-1 M-1B-1 B M - 1 LL LL LL LL LL LL LL LL LL LL LL LL LL LL LL LL LL LL LL LL LL LL LLLLLLLL L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L LL LL P Z - 2 B - 3 A A ' L E G E N D : I N C L I N O M E T E R S : I - 2 B - 1 S E T T L E M E N T P L A T F O R M : S P - 2 B - 1 P I E Z O M E T E R - V E R T I C A L : P Z V - 2 B - 1 M O N U M E N T - S U R V E Y : M - 2 A - 1 B E N C H M A R K : B M - 1 102030TENTHSINCHES123 D W G S I Z E R E V I S I O N F O R D R A W I N G N O . T I T L E F I L E N A M E : D W G T Y P E : J O B N O : D A T E : S C A L E : D E S : D F T R : C H K D : E N G R : A P P D : AFEDCB 234 5 7 8 9 6 4 5 7 8 9 1 0 6 A F C B 2 4 . 0 " x 3 5 . 5 " A R C H D A L L E N S T E A M S T A T I O N 0 6 0 4 4 6 5 5 6 1 2 - 1 5 - 2 0 1 6 R E V I S I O N 1 1 A S N O T E D A L N _ C 9 0 7 . 0 0 2 . 0 0 1 L L I N S T R U M E N T A T I O N P L A N R A B A S H L A N D F I L L ( A L L - 6 0 0 ) G A S T O N C O U N T Y , N O R T H C A R O L I N A G A S T O - 0 1 6 F I G U R E 1 SP-2B-1 S B - 2 B - 2 B M - 1 LL LL LL LL LL LL LL LL LL LL LL LL LL L L L L L L L L L L L L L L LL LL P Z - 2 B - 3 A A ' L E G E N D : I N C L I N O M E T E R S : I - 2 B - 1 S E T T L E M E N T P L A T F O R M : S P - 2 B - 1 P I E Z O M E T E R - A N G L E D : P Z A - 2 B - 1 P I E Z O M E T E R - V E R T I C A L : P Z V - 2 B - 1 M O N U M E N T - S U R V E Y : M - 2 A - 1 B E N C H M A R K : B M - 1 102030TENTHSINCHES123 D W G S I Z E R E V I S I O N F O R D R A W I N G N O . T I T L E F I L E N A M E : D W G T Y P E : J O B N O : D A T E : S C A L E : D E S : D F T R : C H K D : E N G R : A P P D : AFEDCB 234 5 7 8 9 6 4 5 7 8 9 1 0 6 A F C B 2 4 . 0 " x 3 5 . 5 " A R C H D A L L E N S T E A M S T A T I O N 0 6 0 4 4 6 5 5 6 1 2 - 1 5 - 2 0 1 6 R E V I S I O N 1 1 A S N O T E D A L N _ C 9 0 7 . 0 0 2 . 0 0 2 L L G A S T O - 0 1 6 I N S T R U M E N T A T I O N P L A N - E A S T D I K E R A B A S H L A N D F I L L ( A L L - 6 0 0 ) G A S T O N C O U N T Y , N O R T H C A R O L I N A F I G U R E 2 INCLINOM E T E R D E T A I L ( I - X ) NTS SETTLEMENT PLATFORM DETAILS (SP-X)ELEVATION PLAN B E N C H M A R K ( B M - X ) P I E Z O M E T E R - V E R T I C A L D E T A I L ( P Z - X ) MONUMENT DETAIL (M-X)TY P I C A L B O L L A R D D E T A I L 102030TENTHSINCHES123 D W G S I Z E R E V I S I O N F O R D R A W I N G N O . T I T L E F I L E N A M E : D W G T Y P E : J O B N O : D A T E : S C A L E : D E S : D F T R : C H K D : E N G R : A P P D : AFEDCB 234 5 7 8 9 6 4 5 7 8 9 1 0 6 A F C B 2 4 . 0 " x 3 5 . 5 " A R C H D A L L E N S T E A M S T A T I O N 0 6 0 4 4 6 5 5 6 1 2 - 1 5 - 2 0 1 6 R E V I S I O N 1 1 A S N O T E D A L N _ C 9 0 7 . 0 0 2 . 0 0 3 G A S T O - 0 1 6 I N S T R U M E N T A T I O N D E T A I L S R A B A S H L A N D F I L L ( A L L - 6 0 0 ) G A S T O N C O U N T Y , N O R T H C A R O L I N A F I G U R E 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 E V A T I O N ( F T ) 0 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 E Z O M E T E R IN C L I N O M E T E R 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. Page 4 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 25.7 LL=49 PL=27 PI=22%G=3.5 %S=35.3%M=25.4 %C=35.8%F=61.2 3244 24311 8444 3245 3346 27912 2344 Gravel (roadway) Red, Silty CLAY (cl), fill 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 622.3 620.3 617.8 612.8 610.3 609.8 603.8 0.5 2.5 5.0 10.0 12.5 13.0 19.0 1 2 3 4 5 1 6 7 100 90 75 60 95 100 25 50 0.0622.8Sa m p l i n g R e s i s t . Blo w s / 6 " O R CO R E % R Q D Re c o v e r y , % De p t h , fe e t Ty p e Gr a p h i c L o g Po c k e t P e n e - tr o m e t e r , t s t El e v a t i o n , fe e t Wa t e r C o n t e n t SAMPLES MATERIAL DESCRIPTION Nu m b e r REMARKS AND OTHER DETAILS Re c o v e r y , % PWICME 550 DrillingMethod Total Depthof Borehole Grout 622.8 ft above msl Drill BitSize/Type Brandy Costner 62.0´ bgs SPT, Shelby Tubes Date(s)Drilled GroundwaterLevel(s) 09/30/2014 SamplingMethod(s)Automatic Drill RigType DrillingContractor LoggedBy SurfaceElevation BoreholeBackfill HammerData Ryan Doyle, EITCheckedBy 4.25" ID HSA Log of Boring URS-4-B 620 615 610 605 600 595 0 5 10 15 20 25 30 Project Location: Allen Re p o r t : G E O _ C R ; F i l e Y : \ P R O J E C T S \ 1 7 4 7 \ D U K E E N E R G Y \ X X X X X X X X _ D U K E A L L E N \ B O R I N G A N D C P T L O G S \ B O R I N G L O G S \ G I N T \ B O R I N G L O G S _ D U K E E N E R G Y _ A L L E N . G P J ; 5 / 4 / 2 0 1 5 1 0 : 2 3 : 4 7 A M Project Number: 31835141 Project: Duke Energy Sheet 1 of 2 21.1 24.7 22.6 28.0 27.6 27.6 LL=54 PL=24 PI=27%G=2.3 %S=32.4%M=18.4 %C=46.9%F=65.3 LL=NP PL=NP PI=NP%G=2.7 %S=78.4%M=16.0 %C=2.9%F=18.9 771010 8121628 34710 24612 34712 Dense, wet, orange-brown, medium to coarse Silty SAND (SM),trace quartz fragments, alluvium Medium dense, wet, brown to white, medium to coarse Silty SAND(sm), residuum End of Boring at 62´ bgs 577.8 572.8 560.8 45.0 50.0 62.0 2 8 3 9 10 11 12 113 100 115 90 100 100 0 Sa m p l i n g R e s i s t . Bl o w s / 6 " O R CO R E % R Q D Re c o v e r y , % De p t h , fe e t Ty p e Gr a p h i c L o g Po c k e t P e n e - tr o m e t e r , t s t El e v a t i o n , fe e t Wa t e r C o n t e n t SAMPLES MATERIAL DESCRIPTION Nu m b e r REMARKS AND OTHER DETAILS Re c o v e r y , % Log of Boring URS-4-B 590 585 580 575 570 565 560 30 35 40 45 50 55 60 Project Location: Allen Re p o r t : G E O _ C R ; F i l e Y : \ P R O J E C T S \ 1 7 4 7 \ D U K E E N E R G Y \ X X X X X X X X _ D U K E A L L E N \ B O R I N G A N D C P T L O G S \ B O R I N G L O G S \ G I N T \ B O R I N G L O G S _ D U K E E N E R G Y _ A L L E N . G P J ; 5 / 4 / 2 0 1 5 1 0 : 2 3 : 4 7 A M Project Number: 31835141 Project: Duke Energy Sheet 2 of 2 14644 ASH 613.8 611.8 9.0 11.0 13 4 58 50 0.0622.8Sa m p l i n g R e s i s t . Blo w s / 6 " O R CO R E % R Q D Re c o v e r y , % De p t h , fe e t Ty p e Gr a p h i c L o g Po c k e t P e n e - tr o m e t e r , t s t El e v a t i o n , fe e t Wa t e r C o n t e n t SAMPLES MATERIAL DESCRIPTION Nu m b e r REMARKS AND OTHER DETAILS Re c o v e r y , % 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 Ryan Doyle, EITCheckedBy 4.25" ID HSA Log of Boring URS-4-Ba 620 615 610 605 600 595 0 5 10 15 20 25 30 Project Location: Allen Re p o r t : G E O _ C R ; F i l e Y : \ P R O J E C T S \ 1 7 4 7 \ D U K E E N E R G Y \ X X X X X X X X _ D U K E A L L E N \ B O R I N G A N D C P T L O G S \ B O R I N G L O G S \ G I N T \ B O R I N G L O G S _ D U K E E N E R G Y _ A L L E N . G P J ; 5 / 4 / 2 0 1 5 1 0 : 2 3 : 4 8 A M 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 Sa m p l i n g R e s i s t . Bl o w s / 6 " O R CO R E % R Q D Re c o v e r y , % De p t h , fe e t Ty p e Gr a p h i c L o g Po c k e t P e n e - tr o m e t e r , t s t El e v a t i o n , fe e t Wa t e r C o n t e n t SAMPLES MATERIAL DESCRIPTION Nu m b e r REMARKS AND OTHER DETAILS Re c o v e r y , % 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 p o r t : G E O _ C R ; F i l e Y : \ P R O J E C T S \ 1 7 4 7 \ D U K E E N E R G Y \ X X X X X X X X _ D U K E A L L E N \ B O R I N G A N D C P T L O G S \ B O R I N G L O G S \ G I N T \ B O R I N G L O G S _ D U K E E N E R G Y _ A L L E N . G P J ; 5 / 4 / 2 0 1 5 1 0 : 2 3 : 4 8 A M 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 Sa m p l i n g R e s i s t . Bl o w s / 6 " O R CO R E % R Q D Re c o v e r y , % De p t h , fe e t Ty p e Gr a p h i c L o g Po c k e t P e n e - tr o m e t e r , t s t El e v a t i o n , fe e t Wa t e r C o n t e n t SAMPLES MATERIAL DESCRIPTION Nu m b e r REMARKS AND OTHER DETAILS Re c o v e 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 p o r t : G E O _ C R ; F i l e Y : \ P R O J E C T S \ 1 7 4 7 \ D U K E E N E R G Y \ X X X X X X X X _ D U K E A L L E N \ B O R I N G A N D C P T L O G S \ B O R I N G L O G S \ G I N T \ B O R I N G L O G S _ D U K E E N E R G Y _ A L L E N . G P J ; 5 / 4 / 2 0 1 5 1 0 : 2 3 : 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 Sa m p l i n g R e s i s t . Bl o w s / 6 " O R CO R E % R Q D Re c o v e r y , % De p t h , fe e t Ty p e Gr a p h i c L o g Po c k e t P e n e - tr o m e t e r , t s t El e v a t i o n , fe e t Wa t e r C o n t e n t SAMPLES MATERIAL DESCRIPTION Nu m b e r REMARKS AND OTHER DETAILS Re c o v e r y , % Log of Boring URS-4-Ba 520 515 510 505 500 495 490 105 110 115 Project Location: Allen Re p o r t : G E O _ C R ; F i l e Y : \ P R O J E C T S \ 1 7 4 7 \ D U K E E N E R G Y \ X X X X X X X X _ D U K E A L L E N \ B O R I N G A N D C P T L O G S \ B O R I N G L O G S \ G I N T \ B O R I N G L O G S _ D U K E E N E R G Y _ A L L E N . G P J ; 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