SECTION 617: VIBRATION MONITORING AND VIDEO RECORDING
617.1 Description
The Contractor shall perform vibration monitoring and video rec ording in and around all engineered Structures, sensitive features and construction area s as indicated in the Contract and as determined by the vibration risk survey, or as directed by the Project Manager. Sensitive features may include archaeological sites, historical features, utilities, and historic Structures, watercourses and other areas subject to damage or e rosion. The Contractor shall perform vibration monitoring and video rec ording to determine if potentially damaging vibrations to engineered Structures and se nsitive features are created as a result of constr uction activity.
617.2 Materials – Reserved
617.3 Construction Requirements
617.3.1 General
617.3.1 1 Vibration Monitoring
Vibration monitoring consists of the following: 1. Vibration risk survey of all sensitive features within the i nfluence zone of construction activity to determ ine size and locations of any ex isting cracks and other defects in any sensitive features; 2. Use of a seismograph, by a qualified vibration specialist, t o monitor vibration levels; and 3. Immediate notification of t he Project Manager, if visual ins pection or seismograph readings indicate that damage to a ny sensitive feature is occur ring due to vibrations.
617.3.1 2 Video Recording
Video Recording consists of the following: 1. Video recording in both directions along the Roadway corrido r and along Roadways to be constructed or reconstruc ted. Insure that these video re cordings pick up existing utilities within the corridor as well as existing drai nage patterns. The maximum speed of camera movement shall not exceed four (4) ft/s ; 2. Pre-Construction video recording for each area on the Projec t shall take place not more than fourteen (14) Days prior to beginning construction in that area or as directed by the Project Manager; 3. During all video recording, provide an audio explanation of significant features observed during recording; 4. Any notification of any damage or any concerns/remedies resu lting from construction activities shall be immediately relayed to the Pro ject Manager; 5. Video record building Structure front and side views, includ ing close-ups of each view, for any features or facilities that may be affected by co nstruction. Where cracks exist on building Structures place a scale next to the c rack and video record to show existing crack size. Such building features may includ e, but are not limited to, all buildings, fences and l andscaping adjacent to the Proje ct limits; 6. Video record the construction area immediately following rai nfall over the area to ascertain drainage patterns. This video recording shall take p lace before Section 617: Vibration Monitoring and Video Recording Page 677 commencing construction when possible; 7. Video recording Equipment and operator shall be onsite withi n ½ hr at the Project Manager’s request; 8. The video viewing system and the appropriate video recording s shall be available for meetings as scheduled, and at the request of the Project Ma nager; and 9. The quality of the visual and audio portions of the video re cordings, and the method of indexing of locations on the recordings, shall be Acceptable to the Project Manager. Recordings or portions of recordings deemed defective or substandard shall be re-recorded.
617.3.2 Condition Survey of Engineered Structures and Sensitive Features
The Contractor shall conduct a vibration risk survey of any se nsitive features within the influence zone of cons truction activity. 1. The Contractor shall submit to the Project Manager, a report documenting conditions of all potentially affe cted sensitive features withi n the survey influence zone or as shown in the Contract; and 2. The Contractor shall include the following information from the survey, for each sensitive feature: 2.1 The age, foundation, and above-ground Structure type or sen sitive feature; 2.2 Provisions for water drainage from roof and around foundati on exterior; 2.3 The age, type, and condition of any sensitive utility; and 2.4 Documentation (in the form of drawing, photographs, or vide o recordings) of the size and location of all cracks, and the type and location of all structural defects.
617.3.3 Equipment
617.3.3 1 Seismograph Equipment
The Contractor shall provide seismograph(s) with self-triggerin g unit(s), approved by the Project Manager, and capable of rec ording three (3) mutually pe rpendicular components of ground motion time histories, in terms of velocity. In the cas e of monitoring blast vibrations, the Contractor shall provide additional capability for recordin g of airblast levels. The Contractor shall provide unit(s) capable of reporting the frequ ency as well as the peak values for all vibration time histories.
617.3.3 2 Video Camera Equipment
The Contractor shall furnish at least one (1) video camera and appurtenances for the duration of the Project. The Equipment shall be capable of pro ducing a color picture when the recording is viewed, equipped with audio capabilities; and equi pped with a zoom lens. The Contractor shall furnish at least one (1) video recording viewing system and appurtenances for the duration of the Project. The Equipment s hall be capable of reproducing a color picture with audio on a television screen; and capable of slow motion, stop for viewing of single picture image, and reverse controls. The Contractor shall supply a sufficient number of two (2) hou r videos to videorecord the entire construction area and adjac ent areas before construction commences, and as required or directed by the Project Manager during and after constructio n. Each videorecording shall Section 617: Vibration Monitoring and Video Recording Page 678 be titled, catalogued, dated, sequenced in chronological order, and cross-referenced. A copy of each two (2) hour videorecording shall be submitted to the P roject Manager. This copy shall also be titled, catalogued, dated, sequenced, and cross-r eferenced; and will remain the property of the Department upon Acceptance by the Project Manag er.
617.3.4 Seismograph Location and Usage
The Contractor shall place seismographs outside the sensitive f eatures closest to the construction activity as determi ned by the vibration risk surve y or approved by the Project Manager. The transducer(s) shall be placed between the constru ction and the sensitive features and coupled to the ground.
617.3.5 Frequency of Vibration Monitoring
For all construction activity o ther than blasting, the Contract or shall perform monitoring at least two (2) times during peak construction when construction activity is occurring near the sensitive features, and a t the Project Manager’s request.
617.3.6 Qualification for Vibration Monitoring
The Contractor shall provide a qualified specialist competent t o perform the Work and analyze the results of vibration monitoring. Department approv ed specialist are on file with the Department’s Geotechnical Section.
617.3.7 Prior Experience
The Contractor shall submit the following written documentatio n of prior experience to the Project Manager: 1. Copies of reports including analysis and conclusions for at least three (3) previous Projects similar in sc ope to this Project; and 2. Resumes for all personnel involved in this Work.
617.3.8 Analysis of Vibration Monitoring
The Contractor shall submit to the Project Manager eight (8) co pies of a comprehensive report for each sensitive feat ure. Each report shall include a discussion of: 1. Site conditions and descripti on, including a site map drawn to scale showing the location of the sensitive feature and the location of the const ruction activity; 2. Field procedures and Equipmen t used, including the seismogra ph manufacturer, model and unit serial number; 3. The name of the seismograph operator; 4. A hard copy of all ground vibration time histories, in units of velocity; 5. A record summary of the maximum value of ground vibration in any one (1) of three
3.directions measured (longitudi nal, radial, or vertical), th e frequency associated with the maximum value, in unit of hertz, and the measured dist ance between the seismograph and the cons truction activity; 6. Analysis of results with conclusions and recommendations; In the case of blasting, the report shall also include: a. A hard copy of the airblast time history, in units of decibe ls and pounds per square inch (psi), the maximum va lue of airblast, in decibels, and the peak airblast frequency in hertz; Section 617: Vibration Monitoring and Video Recording Page 679 b. The maximum charge weight of explosive used per eight (8) mi llisecond time Delay; c. The scaled distance factor used for design; and d. A plot of the ground motion velocity plotted against frequen cy for the maximum values recorded on a graph sim ilar to that shown in Figure 617. 3.8:1. The Contractor shall submit any additional inclusions to the re port(s) at the direction and request of the Project Manager. Figure 617.3.8:1
617.3.9 Safe Vibration Levels for Blasting
The Contractor shall base safe levels of the maximum ground mot ions and air blast in accordance with nationally recog nized standards specified by th e U.S. Bureau of Mines 30 CFR Parts 715 and 817.
617.4 Method of Measurement
Vibration Monitoring will be measured as a Lump sum unit. Vibration Risk Survey will be measured as a Lump sum unit.
617.5 Basis of Payment 11 0 1 0 0
Blast Vibration Frequency (Hz)0.010.101.00Maximum Recommended Particle Velocity (in/s)0.75 in/s2.0 in/s Pay Item Pay Unit Vibration Monitoring Lump Sum Vibration Risk Survey Lump Sum Video Recording Lump Sum Section 618: Traffic Control Management Page 681
Source: New Mexico Standard Specifications for Highway and Bridge Construction, 2019 Edition. Pages 0–0 of 974.