Attachment 5_31 01 00 - VIBRATION MONITORING - JULY 29_2025.pdf

DDG(X) LBTS WP4: Shaftline Foundation 1733372

SECTION 31 01 00

VIBRATION MONITORING

04/14

PART 1 GENERAL

1.1 DESCRIPTION

This work shall consist of the Contractor employing the services of a Vibration Control Consultant for use in monitoring slab demolition, pile installation, mechanical demolition, and all other construction activities which may induce vibrations. Work under this item includes performing a pre and post-construction survey, and monitoring and recording the vibrations due to construction operations. The Contractor shall submit to the Government a detailed description of the means, methods, equipment and materials used, and methods for controlling vibration by limiting ground motion. The existing structures and utilities shown on the drawings are for the Contractor's information only. The Contractor shall verify the existence and exact location of all structures and utilities in the vicinity of work involving vibrations, which the Consultant deems necessary. The Contractor's attention is directed to the following specific locations for consideration, which are located in the project vicinity.

a. Existing lab vicinity column line D27.

b. Existing lab vicinity column line D27.

c. Existing north wall of Building 77H at column line 35.

d. Existing Building 77H roof.

1.2 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

Preconstruction Survey Plan; G Preconstruction Survey; G Vibration Control Consultant Documentation; G Vibration Monitoring Plan; G

SD-03 Product Data

Vibration Monitoring Instrument; G

SD-06 Test Reports

Vibration Monitoring Records; G

SD-07 Certificates

Certificate of Vibration Calibration; G

SD-11 Closeout Submittals

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29 July 2025

Post Construction Survey Plan; G Post Construction Survey; G

1.3 QUALITY ASSURANCE

1.3.1 Vibration Control Consultant Documentation

The Contractor shall employ the services of an independent consultant, specializing in the field of monitoring vibrations as a result of construction activities, and their effects on structures and utilities.

The Vibration Control Consultant shall submit to the Government for approval, documentation of at least five (5) years of experience, evidence of the satisfactory completion of at least five (5) monitoring programs or operations comparable in scope to this work, and three (3) examples of pre- and post-construction survey reports.

1.3.2 Vibration Control Meeting

The Government will review the required submittals for conformance with the Contract Drawings and Specifications. Within 30 days after receipt of the submittals, the Government will notify the Contractor of any additional information required and/or changes necessary to meet the contract requirements. Any parts of the submittals that are unacceptable will be rejected and the Contractor shall resubmit changes for re-evaluation. All procedural approvals given by the Government shall be subject to trial in the field and shall not relieve the Contractor of the responsibility to satisfactorily complete the work in this specification.

Prior to construction, the Contractor shall arrange a Vibration Control Meeting with the Government and Vibration Control Consultant to discuss construction procedures for this project.

PART 2 PRODUCTS

2.1 VIBRATION MONITORING INSTRUMENT

Submit manufacturer's specifications describing instrument characteristics of all ground motion monitoring instruments to be used.

The seismographs shall be capable of providing a permanent record of the three components of ground motion in terms of "particle velocity", with velocity transducers having a flat response over a range of at least 6 to 200 Hertz, and in addition shall be capable of internal dynamic calibration.

Peak Particle Velocity shall be the measure of the level of ground vibration and is defined as the maximum of any one of the three mutually perpendicular components of motion.

2.1.1 Certificate of Vibration Calibration

Submit current certification of calibration. A monitoring instrument shall be calibrated annually and when an instrument is repaired and the repair may affect the response of the instrument. Calibration shall be done by the manufacturer of the equipment, or by an organization approved by the manufacturer, or by an organization having verifiable knowledge of the calibration procedures developed by the manufacturer. The calibration procedure shall include testing the response of the entire system to externally-generated dynamic inputs. These inputs shall test the entire

SECTION 31 01 00 Page 2 monitoring system at a sufficient number of discrete frequency intervals to assure flat response throughout the frequency ranges specified. Dynamic reference standards used for calibration shall be traceable to the National Institute of Standards and Technology (NIST). Calibration procedures and documentation of calibration shall be made available for review by the Government.

A nonalterable sticker that is clearly visible shall be firmly affixed to the instrument. The sticker shall indicate the name of the calibration facility, the calibration technician, the date of calibration and frequency range of the monitor.

PART 3 EXECUTION

3.1 GENERAL EXECUTION

Where construction activity involving vibration is performed, vibration monitoring shall be required. The Contractor shall employ a Vibration Control Consultant to monitor and analyze results from seismographic recordings and to provide advice in order to eliminate the occurrence of damage to the existing structures due to construction operations. Initial tests of construction activity shall be monitored under the supervision of the Vibration Control Consultant who will determine the maximum vibration limitations and maintain the vibration effects at or below the limitation levels at existing structures or utilities.

After completion of the tests, the Vibration Control Consultant shall monitor and record ground motion caused by construction activities, and provide the Government with daily monitoring records. Should data indicate that limiting levels have been exceeded; the Contractor shall take necessary measures to reduce vibrations to acceptable levels. Should conditions warrant, the Government reserves the right, at any time, to require the Contractor to submit a revised plan to reduce the vibrations.

Nothing presented in these specifications shall in any way relieve the Contractor of any responsibility for any and all damage to existing structures, utilities, or the work. Any damage incurred as a result of the Contractor's construction operations shall be repaired by the Contractor at his sole cost to the complete satisfaction of the property owner and Government.

3.2 PREPARATION

3.2.1 Preconstruction Survey Plan

A survey plan shall be submitted by the approved Vibration Control Consultant, describing the locations of proposed preconstruction surveys to be performed at each potentially affected property, structure, or utility with in 200 feet of proposed construction activities, and shall provide for two (2) additional locations, as may be specified by the Government. The surveys shall be conducted and documented as described herein. The preconstruction survey shall be performed in the presence of the respective owner of each structure or utility, or his duly authorized representative. The Government may accompany the Vibration Control Consultant during the survey.

3.2.2 Preconstruction Survey

Preconstruction surveys shall be performed by the Vibration Control Consultant to determine the condition of any property or structure, and to

SECTION 31 01 00 Page 3 document any pre-existing defects, cracks, or irregularities. The contents of structures shall also be identified and their condition documented.

Crack displacement monitoring gages shall be installed as appropriate across any significant existing cracks to help verify any additional building distress if it should develop. The appropriate location, number and type of gages will be established by the Contracting Officer. The gages will be read prior to vibration producing activities, as well as during these activities. Data shall be obtained on a weekly basis for as long as the vibration-producing activities are being conducted. A report shall be submitted which summarizes the data. The Contracting Officer shall be alerted if any significant movement is detected by the monitoring gages.

Each property or structure surveyed shall have a separate bound survey report and shall include identification of the property or structure, owner, date and time of survey, and shall accurately relate all photographs, tape (or digital) records, measurements and sketches to the body of the report. A Goverment photographer shall provide to the Vibration Control Consultant eight-inch by ten-inch (8" x 10") color photographs for the report. Three (3) copies of each survey report shall be furnished to the Government 30 days prior to any construction operations. The Contractor, the Vibration Control Consultant and the Government photographer shall furnish a notarized statement, to the Government, certifying the date(s) of the preconstruction survey. This certification shall include a statement that the preconstruction survey was made in the presence of and to the satisfaction of each respective structure or utility owner. Should the property or structure owner disagree with any item of the report, provisions shall be made so that such a disagreement is documented and distributed to all parties involved.

3.2.3 Vibration Monitoring Plan

Submit a vibration monitoring plan, describing the locations of each instrument and methods of monitoring. In addition to the location(s) described on the vibration monitoring plan, the Consultant shall include provisions for up to two (2) additional instruments located at monitoring sites as specified by the Government.

3.3 FIELD QUALITY CONTROL

3.3.1 Vibration Monitoring

Vibrations shall be limited such that the maximum peak particle velocity as measured shall not exceed the recommendation of the Vibration Control Consultant, as approved by the Government.

3.3.1.1 Vibration Monitoring Records

The Vibration Control Consultant's monitoring instruments shall be located immediately adjacent to the nearest structure(s) and at other locations as designated on the approved vibration monitoring plan. The record shall consist of the seismographic records identified by instrument number, location of each instrument, date, time and location of vibration origin, and all other data necessary to control the operations. These records, as a formal report, shall be submitted to the Government on a monthly basis and provided in tabulated form at all other times. Provide daily monitoring of the sensors and report to the Contracting Officer if

SECTION 31 01 00 Page 4 vibrations exceed acceptable levels.

3.4 CLOSEOUT ACTIVITIES

3.4.1 Post Construction Survey Plan

A survey plan shall be submitted by the approved Vibration Control Consultant, describing the locations of proposed post-construction surveys to be performed at each potentially affected property, structure, or utility, and shall provide for two (2) additional locations, as may be specified by the Government. The surveys shall be conducted and documented as described herein. The post-construction survey shall be performed in the presence of the respective owner of each structure or utility, or his duly authorized representative. The Government may accompany the Vibration Control Consultant during the survey.

3.4.2 Post Construction Survey

Post-construction surveys shall be performed by the Vibration Control Consultant upon completion of all operations involving vibrations, at the same locations as the preconstruction surveys. The Consultant shall re-examine the condition of structures, and document all defects, cracks or irregularities noted in the preconstruction survey. Additionally, any defects, cracks or irregularities not noted in the preconstruction survey shall be documented. Each property or structure surveyed shall have a separate bound survey report, independent of the preconstruction survey report. Each report shall include identification of the property or structure, owner, date and time of survey, shall accurately relate all photographs and tape records to the body of the report, and shall include documentation and photographs of any damage and a comparison to the preconstruction survey. Three (3) copies of each post-construction survey report shall be furnished to the Government.

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