13 51 00.10 08.pdf

Pike Island LD, River Wall Crack Stabilization

SECTION TABLE OF CONTENTS

DIVISION 13 - SPECIAL CONSTRUCTION

SECTION 13 51 00.10 08

INSTRUMENTATION

PART 1 GENERAL

1.1 SCOPE

1.2 MEASUREMENT AND PAYMENT

1.3 REFERENCES

1.4 SYSTEM DESCRIPTION

1.4.1 Existing Conditions

1.4.1.1 Original Instrumentation

1.4.2 New Instrumentation

1.4.2.1 Vibrating Wire Crackmeter

1.4.2.2 Manual 3-d Crackmeter

1.5 QUALIFICATIONS

1.5.1 Instrumentation Coordinator

1.5.2 Installation Personnel

1.6 SUBMITTALS

1.7 DAMAGE TO EXISTING PROJECT FEATURES

1.8 SEQUENCING AND SCHEDULING

1.9 INSTRUMENTATION INSTALLATION PLANS

1.10 INSTRUMENTATION AND EQUIPMENT

PART 2 PRODUCTS

2.1 NEW INSTRUMENTS

2.1.1 Vibrating Wire Crackmeter

2.1.2 Fiber Optic Crackmeter

2.1.3 Manual 3-d Crackmeter

2.1.4 Saw Cuts

2.2 PROTECTIVE ENCLOSUREs

2.3 ANCHORS

2.3.1 Epoxy Grout

2.4 DATA ACQUISITION

2.4.1 Dataloggers

2.4.1.1 Manual Readings

2.4.2 Signal Cables

2.5 DATA, REPORTS, AND DRAWINGS

2.5.1 Data Ownership

2.5.2 Data Integrity

2.5.3 Requirements for Data Review, Plotting and Presentation

2.5.3.1 Crackmeter Data, VW and Manual

2.5.3.2 Sawcut Data

PART 3 EXECUTION

3.1 INSTALLATION REQUIREMENTS

3.1.1 General Installation Requirements

3.1.2 Installation of Crackmeters

SECTION 13 51 00.10 08 Page 1 CERTIFIED FINAL DOCUMENTS - W911WN20B8008 - Amendment 0002

3.1.3 Installation of Saw Cuts

3.2 DECOMISSIONING REQUIREMENTS

3.3 READING REQUIREMENTS

3.3.1 Initial Readings

3.3.2 Movement Thresholds

3.3.3 Response to Action Threshold

3.4 AS-BUILT PLANS

3.5 OTHER REQUIREMENTS

3.5.1 Storage and Handling

3.5.2 Additional Readings

-- End of Section Table of Contents --

SECTION 13 51 00.10 08 Page 2

SECTION 13 51 00.10 08

INSTRUMENTATION

PART 1 GENERAL

1.1 SCOPE

The Contractor shall obtain the services of an independent firm specializing in the installation and monitoring of instrumentation of the type specified herein. The firm shall be responsible for the work described in this section and indicated on the drawings and shall consist of the following activities:

a. Furnishing all labor, equipment and materials;

b. Performing all operations necessary to install the vibrating wire crackmeters, 3-d crackmeters, corresponding protected cable runs, remote dataloggers, and protective covers where required and in a timely manner;

c. Recording and reporting the instrumentation data to USACE in accordance with the specified time schedule. All equipment used for instrumentation testing or observations shall be supplied, calibrated, maintained and protected by the Contractor in accordance with the respective manufacturers' recommendations.

The instrumentation to be monitored shall include vibrating wire crackmeters and 3-d crackmeters.

1.2 MEASUREMENT AND PAYMENT

Measurement and payment for the work covered under this section will be made as specified in Section 01 22 00.00 08 PRICE AND PAYMENT PROCEDURES.

1.3 REFERENCES

ASTM INTERNATIONAL (ASTM)

ASTM C881/C881M (2015) Standard Specification for Epoxy-Resin-Base Bonding Systems for Concrete

1.4 SYSTEM DESCRIPTION

The purpose of the work specified herein is to monitor the dimensional stability between the two monoliths at the work area, and the dimensional stability of each of the two monoliths. Monitoring will be performed using instruments including vibrating wire crackmeters, manual 3-d crackmeters, and a sawcut. These instruments will be used to measure dimensional stability of the monoliths prior to, during and following stabilization of the monolith cracks using anchors and cement grout, and supporting construction and demolition. Due to potential access difficulties in the bulkhead slot, vibrating wire crackmeters will be the primary means of sensing movement, with manual crackmeters provided as backup. Specifications for monitoring are found in the paragraph

SECTION 13 51 00.10 08 Page 3

MONITORING.

Instrumentation materials and equipment installed shall be the standard products of a manufacturer regularly engaged in the manufacture of such products. Equipment shall be supported by service organization that is, in the opinion of the Contracting Officer or designated representative, reasonably convenient to the site. Instrumentation and all related components shall be in operational condition and calibrated according to the recommendations of the manufacturer(s) or as directed by the Contracting Officer or designated representative. Materials and equipment, including newly installed instrumentation, cable runs, conduit, instrumentation protection, dataloggers, tablet or laptop computer and software to access dataloggers, manufacturer's calibration sheets, and datalogger readout cables, and excluding remote vibration monitors, shall not become the property of the Government at the end of this Contract.

Materials and equipment shall be maintained in operational condition through the duration of the Contract.

1.4.1 Existing Conditions

The work area consists of two adjacent concrete monoliths with a bulkhead slot between the monoliths. A crack runs to some depth through both monoliths. During normal operations the tops of monoliths remain above water. The bulkhead slot is typically covered with metal grating.

1.4.1.1 Original Instrumentation

One alignment and settlement pin is installed on the top of each monolith.

These pins are not required to be read for this Contract.

1.4.2 New Instrumentation

Additional instrumentation shall be installed prior to construction.

Instrumentation to be installed includes vibrating wire crackmeters in a 3-d configuration, manual 3-d crackmeters, and a sawcut between the two monoliths. Ancillary equipment required includes data loggers, and any other equipment necessary, including but not limited to cable runs, conduit, and protective enclosures to collect data to monitor the monoliths at the bulkhead slot during the new work. All new instruments shall collect data at and be read at the frequencies specified or as otherwise directed by the Contracting Officer or designated representative.

1.4.2.1 Vibrating Wire Crackmeter

Each crackmeter shall be of vibrating wire type and shall be connected to a datalogger. Each crackmeter shall consist of a cluster of vibrating wire crackmeters in a configuration to measusre displacement in the x, y, and z planes across the monolith cracks. X shall be the dimension in line with the nominal direction of flow, Y shall be the dimension orthogonal to the flow in the same plane of elevation, and Z shall be elevation.

1.4.2.2 Manual 3-d Crackmeter

Manual 3-d crackmeters denotes a physical monument or system of monuments that can be used to accurately measure 3-dimensional displacement across a crack.

SECTION 13 51 00.10 08 Page 4

1.5 QUALIFICATIONS

The Contractor shall retain the services of a qualified engineering organization responsible for all aspects of the required instrumentation design, installation, and monitoring. The instrumentation engineering contractor shall have experience executing at least five projects similar in scope and detail to the subject project within the last five years.

During the course of the project, the instrumentation coordinator shall be replaced only after submitting the name and qualifications of the replacement 30 days prior to the exchange, and only after government approval of the replacement.

1.5.1 Instrumentation Coordinator

The minimum qualifications for the position of Instrumentation Coordinator shall be as follows:

A Bachelor of Science degree in Engineering from a college or university with an ABET accredited engineering curriculum and two years of progressive experience in installing and reading monitoring instruments for geotechnical engineering purposes; or a degree or certificate of satisfactory completion of a two-year course in Civil Engineering Technology from an accredited technical institute or college, and five years of progressive experience in installing and reading monitoring instruments for Geotechnical Engineering purposes. The Instrumentation Coordinator shall be employed by the instrumentation engineering contractor. If the Instrumentation Coordinator fails to comply with the requirements of the contract, the Contracting Officer or designated representative will suspend construction until a replacement Instrumentation Coordinator and a plan to correct deficiencies is submitted by the Contractor, approved by the Contracting Officer or designated representative, and fully implemented.

1.5.2 Installation Personnel

The instruments shall be installed under direct, on-site supervision of experienced technical personnel, and the Contracting Officer or designated representative or his authorized representative shall have the authority to reject any organization or individuals whom he deems unsatisfactory.

Technical personnel responsible for installing the instruments shall insure that each instrument is properly installed and fully operational before leaving the site.

1.6 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Qualifications; G, DO

Within 90 days after the notice to proceed, the Contractor shall submit to the Contracting Officer or designated representative the name of the independent firm that will be responsible for the installation and monitoring of the instrumentation and the names

SECTION 13 51 00.10 08 Page 5 and qualifications of the Instrumentation Coordinator and the technical personnel that will be performing the work.

Instrumentation Installation Plan; G, DO

The Contractor shall submit the installation plan at least 30 days prior to installing the new instrumentation to the Contracting Officer or designated representative for approval as specified in paragraph INSTALLATION PLANS. This submittal shall include locations in plan and on typical sections. No work shall be performed until this plan has been approved and no deviation from the approved plan will be permitted without prior approval by the Contracting Officer or designated representative.

SD-02 Shop Drawings

Vibrating Wire Crackmeter; G, DO Manual 3-D Crackmeter; G, DO Protective Enclosure; G, DO Cable Enclosures And Routing; G, DO Datalogger; G, DO

Shop drawings shall be submitted for any and all variants of equipment to be installed. Shop drawings shall include fasteners or brackets required for installation, and shall depict the instrument in final installed condition. Protective enclosure shop drawing shall include anchor and/or epoxy details, drill hole diameter and preparation details, conduit details, and miscellaneous fasteners needed to secure conduit.

The Contractor shall submit details and drawings showing how the instruments will be installed and the layout of the monitoring system for each type of instrument listed. The Shop Drawings shall be included in the Installation Plan.

SD-03 Product Data

Vibrating Wire Crackmeter; G, DO Manual 3-D Crackmeter; G, DO Datalogger; G, DO Protective Enclosure; G, DO Computer Data Retrieval System G, DO Signal Cables; G, DO Mechanical Anchors; G, DO Epoxy Grout; G, DO

All product data shall be submitted for approval by the Government 30 days prior to installation or use and shall be included in the Installation Plan.

SD-06 Test Reports

Weekly Instrumentation Reports; G, DO, RO

SD-07 Certificates

Vibrating Wire Crackmeter; G, DO Manual 3-D Crackmeter; G, DO Datalogger; G, DO

SECTION 13 51 00.10 08 Page 6

Signal Cables; G, DO Mechanical Anchors; G, DO Epoxy Grout; G, DO

SD-08 Manufacturer's Instructions

Vibrating Wire Crackmeter; G, DO Manual 3-D Crackmeter; G, DO Datalogger; G, DO Signal Cables; G, DO Mechanical Anchors; G, DO Epoxy Grout; G, DO

Calibration data shall be clearly referenced to each instrument by serial number and the instrument name shown on the plans.

SD-11 Closeout Submittals

As-Built Plans; G, DO

Submit as-built plans in accordance with paragraph AS-BUILT PLANS.

Instrumentation Reports

Submit copies of all previously transmitted data under a single cover for record.

1.7 DAMAGE TO EXISTING PROJECT FEATURES

Locations shown for the instruments are approximate. The Contractor shall submit specific locations as part of the Installation Plans. The location of and installation of the instrumentation shall in no way damage any project features. Any damage done by the Contractor to any project features while accessing or installing instrumentation locations shall be repaired by the Contractor to the original conditions or better at no additional expense to the Government. Any damage to the instrumentation and corresponding equipment is required to be reported to the Contracting Officer or designated representative immediately upon discovering the damage.

1.8 SEQUENCING AND SCHEDULING

All instrumentation shall be fully operational and data shall be surveyed and/or logged beginning a minimum of 7 calendar days before other work activities are performed. Data shall be surveyed and/or logged until a minimum of 7 calendar days after anchor installation and grouting are complete.

1.9 INSTRUMENTATION INSTALLATION PLANS

The Contractor shall prepare the following plans for installing the various items covered by this Section. The Installation Plan shall be submitted to the Contracting OfficerC or designated representative and approved prior to commencing any installation work:

a. Instrumentation Installation Plan - a plan for installing all new instrumentation; including procedures and methods for installing the instruments, selection of precise locations for the instruments, SECTION 13 51 00.10 08 Page 7 protective enclosures, anchoring the instruments, anchoring the protective enclosures, verifying instrument orientation, alignment, and location, and methods for verifying equipment functionality after installation. The plan shall include, but not be limited to, the proposed layout and location of all instruments, proposed power supply, proposed location of dataloggers, proposed layout of cable runs, the proposed method of anchoring the instruments enclosures and cable runs, cable splicing procedures, a listing showing who will be executing each facet of the work, and a description of all methods and procedures that will be utilized to ensure safe operation. This submittal shall also include a statement of the prior experience in the type of work described in these specifications and of the person or persons designated to perform the work specified herein.

This submittal shall also include the routing list for data acquired, including the Contracting Officer or designated representative and Engineering District Office as recipients. Anticipated schedule of data collection shall be included in this submittal.

1.10 INSTRUMENTATION AND EQUIPMENT

All instrumentation and equipment used to monitor and record the instrumentation including newly installed instrumentation, cable runs, conduit, instrumentation protection, dataloggers, tablet or laptop computer and software to access dataloggers,and datalogger readout cables shall be removed at the completion of the contract. Instrumentation repair, replacement, and calibration during the course of the contract shall be at the Contractor's expense. Contractor is responsible for maintaining power to instruments. All instruments shall be tested and operational prior to installation according to manufacturers' recommendations. The results of the tests shall be provided in writing to the Contracting Officer or designated representative.

PART 2 PRODUCTS

2.1 NEW INSTRUMENTS

2.1.1 Vibrating Wire Crackmeter

Crackmeters shall have a vibrating wire sensor. The sensor shall have a range of at least 50 mm and a resolution of 0.025% full scale or better.

2.1.2 Fiber Optic Crackmeter

Fiber optic crackmeters can be utilized instead of vibrating wire crackmeters, provided they meet the following standards. Fiber optic crackmeter systems must meet the same specifications as vibrating wire instruments for accuracy and data collection at a minimum, and must collect and present data in three dimensions as denoted on the plans and specifications. The fiber optic crackmeter systems shall be suitable for use in exposed conditions and inclement weather. Fiber optic crackmeters may not be substituted for the manual 3-d crackmeter shown on the plans.

The specific details, product information and other technical information shall be submitted to the Government for review and approval during the construction phase of the contract to confirm the contract requirements are met.

SECTION 13 51 00.10 08 Page 8

2.1.3 Manual 3-d Crackmeter

The manual 3-d crackmeter shall be a physical device that permits periodic measurement by hand. The device and measuring system employed shall have a range of at least 50 mm, resolution of 0.01 mm or better, and accuracy of 0.05mm or better.

2.1.4 Saw Cuts

A sawcut shall be made to span monoliths R33 and R34. The sawcut shall be the width of the blade making the cut, and shall be a straight line approximately parallel to river flow. The sawcut shall be filled with a colored epoxy. The edges of the sawcut shall remain clearly visible after placement of epoxy. Prior to placing epoxy, the sawcut shall be cleaned in accordance with epoxy manufacturer's recommendations.

2.2 PROTECTIVE ENCLOSUREs

All instruments and cables installed shall have protective enclosures.

Enclosures for cables are referred to as conduit herein. The instrument enclosures shall provide primary protection against damage, including construction and operational activities that may result in the loss of readings. Square or rectangular instrument enclosures shall be capable of fully covering the instruments and cables in plan view and on at least three of four sides, and shall be installed with a gap of at least one inch with all parts of the instruments. Enclosures shall be anchored into concrete using mechanical or epoxy anchors that are independent of the instrument anchors.

Metal or schedule 80 pvc conduit may be used as the protective enclosure for cable runs. Conduit shall be anchored to adjacent concrete at maximum 10 ft intervals to secure it from movement. Conduit shall be flush against concrete for the majority of runs. Cables shall be enclosed in all areas subject to foot traffic or potential impact from debris or equipment.

2.3 ANCHORS

2.3.1 Epoxy Grout

Epoxy grout shall meet the requirements for ASTM C881/C881M, Type IV, Grade 3, Class B or C and as appropriate for the ambient temperature and submersion at the time of installation. Epoxy shall be two component, moisture tolerant, and shall contain a mineral filler.

2.4 DATA ACQUISITION

All equipment for the collection of data shall be fully functional and compatible with the new instruments and all components of the system. The data acquisition system shall consist of dataloggers, data processing computer, signal cables, and wireless communication devices.

2.4.1 Dataloggers

Each datalogger shall accept signals from the various electronic transducers and instruments, convert them to engineering units, and store the data. Dataloggers shall be fully compatible with the instruments they record. Although the datalogger will normally record the data at predetermined times, the units shall be able, at any time, to read any number of sensors upon demand. Dataloggers shall be capable of capturing

SECTION 13 51 00.10 08 Page 9 readings at frequencies no greater than once every 5 minutes and no less than once every 24 hours.

Dataloggers shall be configured to take readings of each instrument at 15-minute intervals. Data shall be collected from a period beginning at least 7 days prior to construction, and shall be collected for a period of at least 7 days after construction.

Each enclosure for dataloggers shall be consist of a NEMA 4x rated enclosure. Enclosures shall be located as is convenient to the contractor while not interfering with navigation. Enclosures shall be secured from unintentionaldisplacement. The datalogger and enclosure shall be removable in case of high water. All enclosure penetrations shall be sealed against moisture and shall use water resistant gaskets. Desiccant packs shall be installed and replaced as necessary to maintain relative humidity levels less than or equal to 40%. The enclosure and all equipment shall be protected against damage from lightning using grounded/bonded connections to an approved earth ground. Enclosure construction shall permit the securing of the equipment with a padlock and shall be sufficiently robust to prevent damage to the equipment.

2.4.1.1 Manual Readings

Readings of the manual 3-d crackmeters shall be conducted weekly.

Additional readings shall be obtained upon implementation and completion of stressing for each of the following anchors: Anchors 6, 12, 18, and 24 at monolith R33, and anchors 1,2,3, and 4 at monolith R34. In the case of damage to the vibrating wire crackmeters, contact the Contracting Officer or designated representative to determine the increased reading frequency until the vibrating wire crackmeters are functional. Readings may be requested at frequencies up to and inclusive of the typical data logging interval.

Record displacement across the sawcut weekly using a tape measure or ruler.

2.4.2 Signal Cables

Instruments shall be connected to the datalogger using signal cables. The signal cable shall comply with the datalogger or instrument manufacturer's recommendations, and shall be fully compatible and function with the equipment.

Signal cables shall be routed through conduit securely affixed to the concrete structure or other means necessary to protect the cables from damage, including that from weather, water, and construction activities that would result in loss of readings. Flexible connections or other method to permit the instrument to move independent of any conduit anchorage shall be provided. Service loops, or cable slack, shall be provided as necessary to prevent dislodging of the instruments in the event of displacement or damage to the conduit. The conduits shall be filled to no more than 75% capacity.

Any and all splices made in cables shall be performed using butt splice gel-filled connector buttons. All wires shall be continued through a splice, where splices are performed. Continuity of instrument signal shall be confirmed after splicing. Spliced segments shall be protected by

SECTION 13 51 00.10 08 Page 10 encasement in epoxy resin.

2.5 DATA, REPORTS, AND DRAWINGS

2.5.1 Data Ownership

All data generated on site by instrumentation and monitoring, and other data associated with the instrumentation of the project shall be the property of the Government. If the Contractor has specific data, judged by the Contractor to be proprietary, that does not affect the Contracting Officer or designated representative's ability to monitor construction, monitor the effects of construction, analyze the project, or monitor risks at the project, the Contractor may submit a request to the Contracting Officer or designated representative to eliminate that data source from reporting requirements or request signed confidentiality agreements. No data source shall be exempt from these data requirements unless a specific exemption is granted by the Contracting Officer or designated representative.

2.5.2 Data Integrity

The Contractor is required to maintain integrity of data such that records are accurate, internally consistent, that all data and records reflect the quality of the data gathered on the site, and that all data is preserved and archived for future use.

Data shall be retrieved from the datalogger(s) weekly while work is being done for the contract. The native data format for the information is comma separated value(.csv)file format. Data shall be recorded in the native units of the instrument. Calibration factors shall be applied later, during data processing. One copy of the comma separated value file shall be saved as a backup. A second, identical copy shall be used to reduce the data. Data shall be reduced and plotted using Microsoft Excel software.

All databases, tables, and graphs shall include an identifier unique to the sensor, e.g. VW Crackmeter A1. All tables of data shall include raw readings, reduced readings, sensor serial number, installed location, installed elevation, manufacturer, model, calibration factors, and equation used to reduce the raw data.

2.5.3 Requirements for Data Review, Plotting and Presentation

The following subsections present the requirements for plotting and presentation of the data. All data presented shall have units labeled.

Sensor orientation shall be presented on the graph, and relative direction of movement corresponding to positive or negative axis values shall be clearly labeled. All graphical data shall be presented at such a scale that movement of the instrument can be observed. Notable construction events shall be labeled at their proper times on the graphical data.

Data shall be reviewed and transmitted to the Contracting Officer or designated representative and Engineering District Office within one day of download from dataloggers or otherwise within one day of data collection. Any issues with the system, apparent movements due to construction, and movements in excess of threshold values shall immediately be brought to the attention of the Contracting Officer or designated representative's Representative.

SECTION 13 51 00.10 08 Page 11

2.5.3.1 Crackmeter Data, VW and Manual

Crackmeter data shall be reduced to inches. Crackmeter data shall be presented in tabular and graphical format. Graphical data shall present the position of the crackmeter on the y-axis versus time on the x-axis.

Tabular data shall include all graphical data and shall include temperature readings of the sensor for vibrating wire sensors.

2.5.3.2 Sawcut Data

Measurements of the displacement between monoliths at the sawcut shall be presented in inches. Data shall be presented in tabular and graphical format. Graphical data shall be presented with the displacement on the y-axis and time on the x-axis.

PART 3 EXECUTION

3.1 INSTALLATION REQUIREMENTS

3.1.1 General Installation Requirements

Immediately after installation of any instrumentation feature, the contractor shall measure the relative offset between monoliths on both the landward and riverward sides of the monoliths. The interior dimensions of the bulkhead slot shall be recorded at this time, as measured at the top of the bulkhead slot.

3.1.2 Installation of Crackmeters

The vibrating wire crackmeters shall be placed in the bulkhead slot, below the portion of concrete to be removed, spanning the cracks in the monoliths at the approximate locations shown on the drawings and as described herein. Each crackmeter shall be located and installed in a way that precludes damage to the instrument and wires and does not interfere with construction or navigation activities.

Crackmeters shall be installed according to the recommendations and instructions provided by the manufacturer. The Contractor shall prepare and clean the surface to receive the instrument so that it is clean and free from any debris or particles that will prevent a close fit. The crackmeter shall be installed at the middle of its allowable range so that either extension or compression will be measured. Crackmeters shall be installed spanning construction joints, with end anchors installed on opposite sides of the joint. Epoxy anchors shall be used to affix the crackmeter assembly to the appropriate element to be monitored.

The manual 3-d crackmeters shall be installed to span the longitudinal cracks present in the two monoliths being rehabilitated for the Contract.

The manual 3-d crackmeters shall be installed below the concrete that is to be removed as part of the Contract. Approximate locations of the manual 3-d crackmeters are shown in plan on the drawings.

SECTION 13 51 00.10 08 Page 12

3.1.3 Installation of Saw Cuts

A sawcut shall be made to span monoliths R33 and R34. The sawcut shall be the width of the blade making the cut, and shall be a straight line approximately parallel to river flow. The sawcut shall be filled with a colored epoxy. The edges of the sawcut shall remain clearly visible after placement of epoxy. Prior to placing epoxy, the sawcut shall be cleaned in accordance with epoxy manufacturer's recommendations.

Record existing outside edge offset of monoliths for river and landward side of monoliths at time of saw cut installation.

3.2 DECOMISSIONING REQUIREMENTS

All newly installed instruments and protective enclosures and conduits shall be removed by the Contractor following the 7-day post-construction monitoring period. If cable runs require or utilize saw cuts through monolith slabs, these channels shall be filled with non-shrink epoxy grout during decomissioning.

3.3 READING REQUIREMENTS

The instruments shall be read for the entirety of the contract at the frequency specified. The Contracting Officer or designated representative has the authority to request additional readings, change the frequency of all automated or manual readings, or request additional downloads from dataloggers at any time. All data acquired from the monitoring program shall be the property of the Government.

Data shall be logged beginning a minimum of 7 calendar days before other construction activities are performed at the monoliths. Data shall be logged until a minimum of the latter of: 7 calendar days after monolith work is complete or 28 days after the final placement of concrete or grout at these monoliths. Logging interval for all vibrating wire crackmeters shall be 15 minutes. Logging interval for manual crackmeters shall be weekly. Manual readings shall also be obtained after anchors are at final stress prior to grouting the cracks. Data will be downloaded from the loggers a minimum of once per week that work is performed for the contract.

3.3.1 Initial Readings

After installation of an instrument and within 24 hours after it is connected to a datalogger, an initial reading shall be obtained. If the initial readings indicate that an instrument is not working properly or was not properly installed, the Contracting Officer or designated representative has the authority to require that the Contractor install a replacement to that instrument at no additional cost to the Government.

3.3.2 Movement Thresholds

Two threshold limits have been established for the allowable deformations of the monoliths. The alert threshold shall identify structures that are undergoing deflections that shall require additional monitoring and the immediate development of possible remedial measures to stabilize the monoliths. The action threshold shall identify structures with the potential for immediate and catastrophic deflections and shall trigger response as detailedin Section 3.3.3.

SECTION 13 51 00.10 08 Page 13

The alert threshold shall be defined as a lateral deflection of greater than 0.25 inch for all displacement-based instrumentation.

The action threshold shall be defined as a deflection of greater than 0.75 inch for all displacement-based instrumentation.

Any issues with the system, apparent movements due to construction, and movements in excess of threshold values shall immediately be brought to the attention of the Contracting Officer or designated representative or designated Representative.

3.3.3 Response to Action Threshold

The Contractor has primary responsibility for safety of personnel and of prevention of damage to existing structures during the contract. In the event of notification of exceedance of an action threshold, the Contractor shall:

a) Immediately perform visual inspection of the affected structure and adjacent structures. If visual indication of deformation or distress is noted, evacuate any persons in the area as necessary.

b) Report in writing to the Contracting Officer or designated representative or his authorized representative the alert condition(s), construction activities at time of the threshold exceedance and one day prior, and visual inspection progress.

c) The Contractor shall immediately cease operations in the vicinity of the affected structure and evacuate personnel as necessary until the Contracting Officer or designated representative or his authorized representative has reviewed the instrumentation data and visual inspection results and permitted the construction activities to proceed.

3.4 AS-BUILT PLANS

The Contractor shall submit complete shop drawings of the instrumentation systems installed for this Contract. Within fourteen days after any new instrumentation is completely installed, the Contractor shall submit to the Contracting Officer or designated representative four sets of prints of complete and detailed as-built drawings of the installed system. The instrument plan locations shown on the contract drawings are approximate.

The Contractor shall be responsible for providing surveyed instrument locations on the as-built plans. The drawings shall show the locations and details of equipment, manufacturer's serial numbers, cables, tag numbers, conduit routing, junction box locations, and other items installed by the Contractor. The drawings shall show the functional relationship and interconnection of components in the system architecture on a block diagram.

3.5 OTHER REQUIREMENTS

In the event automation of an instrument fails to function properly, the Contractor shall manually monitor that instrument until the automation is restored and functions properly. The required frequency of manual monitoring during the event of automation failure shall be one (1) hour, or as directed by the Contracting Officer or designated representative.

The Contractor shall take precaution to make accurate readings on all

SECTION 13 51 00.10 08 Page 14 instruments and prevent damage of any instrument or its proper functioning. The Contractor shall review all data, data plots, and report to the Contracting Officer or designated representative immediately data that deviates from the alert thresholds set based on the initial readings of each instrument in question.

3.5.1 Storage and Handling

The materials, instruments and hardware shall be stored, handled and installed in such a manner as to preclude damage and as prescribed by the manufacturer. The Contractor shall restore or replace, at no cost to the Government, any items damaged or lost during storage, handling or installation. The Contractor shall also maintain and protect all instruments and readout systems after installation as well as all existing instruments.

3.5.2 Additional Readings

The Contractor shall perform, upon request by the Contracting Officer or designated representative, any readings in addition to the established reading schedule.

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SECTION 13 51 00.10 08 Page 15

2.4.2 Signal Cables