211VIBRATION MONITORING

New Hampshire Department of Transportation Standard Specifications – 2016 Description

1.1This work shall consist of monitoring construction related vibrations and setting vibration limits to avoid damaging existing

nearby structures, properties and utilities located on or near this project. 1.1.1 Sources of construction related vibrations which are covered by this specification include compaction equipment (sections 203, 209, 304, 508), cofferdam construction (section 503), sheet piling (section 506) and bearing piles (section 510) or other construction activities as identified. The provisions of section 203.3 shall still apply to vibrations caused by blasting operations.

1.2The work under this specification includes providing the services of a qualified Vi bration Consultant.

1.2.1 As part of this work, the Vibration Consultant shall submit vibration documentation as described in 211.3.7. Construction Requirements

3.1Vibration Consultant Qualifications. The Vibration Consultant shall meet all the applicable qualification requirements of

203.3.3.1 and203.3.3.2. The same Vibration Consultant shall be used on all monitoring activities throughout the project.

3.2Vibration Monitoring Plan. Prior to initiating a particular activity which requires vibration monitoring, the Contractor shall

submit a Vibration Monitoring Plan prepared by the Vibration Consultant. The plan shall be submitted a minimum of 10 working days prior to beginning the particular construction activity. The construction activity shall not begin until the plan has b een approved, except as allowed under 3.2.1. 3.2.1 Prior to the production phase of the particular cons truction activity, the Contractor will be permitted to conduct a test program to establish the allowable vibration limits, subject to approval. The production phase shall not begin until the res ults of the test program have been approved. 3.2.2 The plan shall include the following:

for a test program in accordance with 3.2.1, if the vibration limits cannot be predetermined. Justification shall be provided for all recommendations.

a pre and post construction condition survey in accordance with 3.4. This recommendation shall pay particular attention to historic structures, structures in poor condition, structures supported by vibration sensitive materials which could cause settlement or loss of support, and structures which contain sensitive equipment or processes. The Monitoring Plan shall also include methods for measuring deformation or settlement of selected structures, if deemed necessary by the Vibration Consultant or Engineer.

exceeding vibration limits that are necessary to protect adjacent facilities. 3.2.3 As part of the review of the Monitoring Plan, the Engineer may require modifications to the submittal to include, but not limited to, surveying and monitoring of additional structures, the number of monitoring sites and the distances for monitoring. There may be a need for simultaneous setups with multiple monitoring devices.

3.3Vibration Monitoring Instrumentation. All vibration monitoring equipment shall meet the requirements of 203.3.3.7.

3.4Pre and post construction condition surveys. The Contractor shall conduct a pre- construction condition survey on all

structures, including swimming pools and mobile homes, within 150 feet of the anticipated sources of construction related vibrations. A pre-construction survey shall also be conducted on structures that may be affected by construction related vibrations beyond the 150 foot distance as directed by the Engineer or as contained in the approved Vibration Monitoring Plan. The pre - construction surveys shall not be initiated until the Vibration Monitoring Plan has been approved. Upon completion of all construction operations that are a source of construction related vibrations, the Contractor shall conduct a post -construction condition survey of any structure for which a complaint of damage has been received or a damage claim has been filed. Notification of the post-construction survey shall be given to all interested parties, so they may be present during the survey. A copy of the pre-construction condition surveys shall be provided to the Engineer prior to the start of work. A copy of any post -construction condition survey conducted shall be provided to the Engineer upon its completion.

3.5Coordination Meeting. A coordination meeting arr anged by the Contractor shall be held prior to initiating the particular

construction activity and the associated vibration monitoring. The coordination meeting shall not take place until the Contractor has submitted and received approval of the Vibration Monitoring Plan. The purpose of the meeting shall be to review all aspects

New Hampshire Department of Transportation Standard Specifications – 2016 of the vibration monitoring and to facilitate coordination between all parties involved. Individuals attending the meetings hall include the Engineer, the Vibration Consultant, t he Contractor, the Sub -Contractor involved with the particular construction activity, the Research Geologist from the Materials and Research Bureau and all other personnel deemed appropriate by the previously mentioned personnel. The Engineer and Research Geologist shall be notified at least 5 working days in advance of the meeting.

3.6Schedule for Vibration Monitoring. The frequ ency and duration of vibration monitoring for a particular construction

activity shall be as directed by the Engineer. The Con tractor shall make all necessary arrangements for scheduling the Vibration Consultant, after direction to provide vibration monitoring has been given. The particular construction activity requiring monitoring shall not begin until the Vibration Consultant is on-site.

3.7Vibration Monitoring Reports. At the end of each day of monitoring, the following information shall be recorded and

submitted to the Engineer:

operating frequencies, piling depths and all other related information as requested by the Engineer.

the frequencies of the measured peak particle velocities.

exceeded.

3.7.1 The Vibration Consultant shall complete and submit the Contractor Vibration Report Form for each vibration producing activity each day. Submission of the daily reports at the conclusion of each vibration producing activity is acceptable. The required form can be found at the Department’s Website. Submit two (2) copies; one to the Engineer and one copy to: New Hampshire Department of Transportation Attention: Research Geologist 5 Hazen Drive, PO Box 483 Concord, NH 03302-0483

3.8Adjustments in construction procedures . All complaints about vibrations shall be reported immediately to the Engineer.

If the monitoring data indicates that the ground vibration limits for any of the three mutually perpendicular components have been exceeded, the Contractor shall cease the particular construction activity and submit a written report giving corrective action. The construction activity shall not resume until the report has been reviewed and approved by the Engineer. If complaints occur when vibrations are below the specified limits, the Engineer may order the Contractor to modify the operations to reduce the vibrations further. Method of Measurement

4.1Vibration monitoring services including pre and post construction surveys will be measured by the hour for the accountable

time on site to the nearest one -quarter hour. The hourly rate is all inclusive of the equipment and personnel necessary to perform the vibration monitoring service. The hourly rate is also all inclusive of equipment and personnel necessary to measure or monitor for potential deformation in structures. 4.1.1 Travel time and other time not spent at the construction site and time not authorized will not be measured. Basis of Payment

5.1The accepted quantity of vibration monitoring services will be paid for at the Contract unit price per hour, complete. A

minimum of 4 hours will be paid for each day’s service. 5.1.1 The Vibration Monitoring Plan will be subsidiary except that payment will be made for time on -site which is used in conducting a test program in accordance with 3.2.1. 5.1.2 Travel time and other time not spent at the construction site or off -site areas and support services (i.e., travel, mileage, clerical staff, miscellaneous expenses, overhead, etc.) will be subsidiary. 5.1.3 No payment will be made for time spent in preparing the reports for the condition surveys. Pay Item and Unit:

211.11Vibration Monitoring Services Hours

New Hampshire Department of Transportation Standard Specifications – 2016

Description

This work shall consist of the final grading necessary to make the subgrade, the area under the surface course, the roadway

outside the surface course, and other locations as directed by the Engineer conform to the lines shown on the plans or established by the Engineer. Construction Requirements

The surface of each course of material shall be fine graded to conform to the typical section of the plans prior to placing the

succeeding course. Each course shall be fine graded to conform to the lines and grades as shown on the plans. When fine grading to a specific slope prior to paving, the slope tolerance will be +/-0.2%. 3.1.1 Cross slope to b e measured by the following method: Measurements will be taken by placing a 10 -foot metal straight edge on the surface perpendicular to the traveled lane. A 4 -foot direct reading level shall be placed on top of it. Percent cross slope shall be read and recorded. A second reading 180 degrees to the first shall be taken and recorded and the two shall be averaged for the test result. 3.1.2 The use of automated grade and slope control will be required on all graders. 3.1.3 On projects or parts of projects where the Engineer deems that the use of automatic controls are impracticable, some or all of the controls in 3.1.2 may be waived.

Shoulders, slopes, and ditches shall be shaped with suitable machinery supplemented by hand labor to reasonably smooth

surfaces that are in keeping with the character of the adjacent terrain and shall merge into the adjacent terrain without any noticeable break. Culverts and waterways shall be cleared of all obstructions. Rubbish, brush, loose rock, boulders, and all other debris from the construction work shall be removed and disposed of as directed.

To be acceptable under this item, the entire roadway must present a uniformly finished appearance at the completion of the

work. 3.3.1 The Contractor shall give 24 hour not ice of the expected completion of the final fine grading prior to paving, to allow inspection by the Engineer. Method of Measurement

Fine grading, except as specified in 4.2, will be measured as a unit. If the project is altered to require substantial changes in

the length, width, or character of the fine grading from such length, width, or character shown on the plans, the Contract Unit price will be subject to a negotiated revision.

4.2Fine grading of earth berms constructed in rock cuts will be m easured by the linear foot to the near est 1 -foot along the

adjacent ditch line. Basis of Payment

The accepted quantities will be paid for at the Contract Unit price for fine grading not otherwise classified and per linear foot

for fine grading earth berms constructed in rock cuts.

5.2When no quantity for this item is included in the Contract, this work will be subsidiary.

Pay items and units: 214. Fine Grading Unit

214.3Fine Grading Earth Berms in Rock Cuts Linear Foot