2-139 SECTION 248 – GEOTECHNICAL INSTRUMENTATION AND MONITORING
248.01 DESCRIPTION . This work shall consist of furnishing, installing, monitoring, and maintaining
instrumentation and equipment, recording data, and reporting results in accordance with these provisions, the Plans, and as directed by the Engineer.
248.02 MATERIALS . Materials shall meet the requirements of the following subsections:
Portland Cement ................................ ................................ ................................ ......... 701.02 Sand Borrow and Cushion ................................ ................................ ......................... 703.03 Mortar, Type IV ................................ ................................ ................................ ......... 707.01(e) Miscellaneous Hardware, Shapes, and Fabricated Materials ................................ .....709.01(h) Nonstructural Lumber ................................ ................................ ................................ 709.02 Timber Preservative ................................ ................................ ................................ ...726.01 Plastic Pipe, Rigid (PVC) ................................ ................................ .......................... 740.02 Steel Pipe, Galvanized ................................ ................................ ............................... 740.04
248.03 GENERAL REQUIREMENTS . All instrumentation and monitoring devices shall be installed at
the locations indicated on the Plans or as directed by the Engineer and installed in accordance with the manufacturer’s instructions. Drilling personnel required for instrument installation shall have 3 years of experience in installing geotechnical instrumentation. A qualified geotechnical engineer shall oversee all installation. All instrumentation locations shall be surveyed, in both location and elevation, prior to and after installation or as directed by the Engineer.
248.04 SUBMITTALS . The Contractor shall submit qualifications and references for the qualif ied
geotechnical engineer and driller. The geotechnical engineer shall submit examples of three projects of similar scope with descriptions of instrumentation and shall include reference information for each. The Contractor shall submit to the Engineer for approval an installation and monitoring plan provided by the qualified licensed geotechnical engineer. This shall include an installation schedule, instrumentation installation procedures, calibration sheets as required, monitoring frequency, and a comple te listing of materials to be used. These shall be submitted in accordance with Subsection 105.06 for fabrication drawings.
248.05 MAINTENANCE . The Contractor shall maintain all geotechnical instrumentation equipment in
an acceptable working order for th e duration of the project and shall repair or replace any such equipment which fails to function properly. 2-140 Any instrumentation that becomes damaged or inoperable through no fault of the Contractor and requires replacement shall be replaced and paid for at the unit price bid for the respective instrumentation. Any instrumentation that becomes damaged or inoperable as a result of the Contractor’s operations shall be replaced by the Contractor at no cost to the Agency. The Contractor shall monitor and recor d data as indicated in the installation and monitoring plan or as directed by the Engineer. All data shall be recorded in a format acceptable to the Engineer and shall be provided on a weekly basis at a minimum, or as directed by the Engineer.
248.06 METH OD OF MEASUREMENT . The quantity of Instrumentation and Monitoring Plan to be
measured for payment will be lump sum basis for design and modification of an instrumentation and monitoring plan in the complete and accepted work. The quantity of Slope Inclinom eter and Observation Well to be measured for payment will be the number of linear feet of specified casing satisfactorily installed and maintained in the complete and accepted work. The quantity of Shape Array Instrument; Tiltmeter; Observation Well; Settl ement Platform, Type I; Settlement Platform, Type II; Piezometer, Type III; Datalogger; and Pressure Cell to be measured for payment will be the number of instruments installed, monitored, and maintained in the complete and accepted work.
248.07 BASIS OF PAYMENT . The accepted quantity of Instrumentation and Monitoring Plan will be
paid for at the Contract lump sum price. Payment will be full compensation for designing, preparing, and submitting the plan, making any necessary modifications during constructi on, and all incidentals necessary to complete the work. The accepted quantity of Slope Inclinometer and Observation Well will be paid for at the Contract unit price per linear foot. Payment will be full compensation for furnishing, transporting, handling, and installing all instruments, and for furnishing of all tools, equipment, measuring devices, and incidentals necessary to complete and maintain the instruments. The accepted quantity Shape Array Instrument; Tiltmeter; Observation Well; Settlement Platf orm, Type I; Settlement Platform, Type II; Piezometer, Type III; Datalogger; and Pressure Cell will be paid for at the Contract unit price per each. Payment will be full compensation for furnishing, transporting, handling, and installing the materials spec ified; for protecting and maintaining the instruments, for monitoring and recording survey data for each instrument; and for furnishing all labor, tools, equipment, and incidentals necessary to complete the work. Payment will be made only if the instrument remains functional during all phases of construction unless otherwise allowed by the Engineer. At the completion of the project, the geotechnical instrumentation and appurtenances, including all readout devices, will become the property of the Agency. 2-141 Payment will be made under: Pay Item Pay Unit 248.5000 Instrumentation and Monitoring Plan ................................ ....................... Lump Sum 248.5100 Slope Inclinometer ................................ ................................ .................... Linear Foot 248.5200 Observation Well ................................ ................................ ...................... Linear Foot 248.5300 Shape Array Instrument ................................ ................................ ............ Each 248.5400 Tiltmeter ................................ ................................ ................................ ....Each 248.5501 Settlement Platform, Type I ................................ ................................ ......Each 248.5502 Settlement Platform, Type II ................................ ................................ .....Each 248.5603 Piezometer, Type III ................................ ................................ ................. Each 248.5700 Datalogger ................................ ................................ ................................ .Each 248.5800 Pressure Cell ................................ ................................ ............................. Each 2-142 SECTION 250 – CONSTRUCTION VIBRATION AND CRACK MONITORING
250.01 DESCRIPTION . This work shall consist of conducting construction condition surveys,
developing and implementing a construction vibration monitoring plan, installing monitoring equipment, and performing monitoring of construction activities.
250.02 GENERAL REQUIREMEN TS. Structures identified in the Contract shall be monitored as
specified herein, however, in accordance with Subsection 107.11 , the Contractor shall be responsible for all damage caused by their activities, regardless of whether or not the damaged structu re or infrastructure was identified as being susceptible to damage in the Contract. The Contractor shall notify residents and owners of the buildings identified in the Contract of the required monitoring and inform them of the scheduled activities. At a mi nimum, notification shall include a certified letter. The Contractor shall furnish to the Engineer a list of those contacted and proof of notification. The Contractor shall maintain a log of all vibration related complaints, contact information for complai nant, and actions taken, and shall furnish copies to the Engineer upon request.
250.03 EQUIPMENT . The Contractor shall furnish, maintain, and operate vibration monitoring
equipment, such as seismographs and crack displacement monitoring gauges . Seismograp hs shall be capable of measuring, recording, and producing a hard copy of the frequency and peak particle velocity in three mutually perpendicular components of vibration, the vector sum of these peak particle velocities, and the frequency history of the v ibrations. Instruments that only record vector sum measurements are not acceptable. These instruments shall be capable of measuring linear scale (dB -L) sound levels and be capable of continuously recording the peak particle velocity and providing a permane nt record of the entire vibration event. All monitoring equipment shall be powered with rechargeable batteries. Extension geophone and microphone cables may be necessary so that the instruments can be placed within structures if outside temperatures drop below 32°F. Crack displacement monitoring gages shall be capable of monitoring horizontal and vertical movement with an accuracy of 0.04 inches.
250.04 PERSONNEL PREQUALIFICATION . The Contractor shall provide the services of an
independent qualified engineering consultant. The engineering consultant used shall be subject to the approval of the Engineer.