1826-35_41_17-AM02.pdf

ARCF WRDA 96 - Phase 2 Remaining Sites - Sites R7 and L7 1826

SECTION TABLE OF CONTENTS

DIVISION 35 - WATERWAY AND MARINE CONSTRUCTION

SECTION 35 41 17

JET GROUT CUTOFF WALL

PART 1 GENERAL

1.1 SUMMARY

1.2 REFERENCES

1.3 DEFINITIONS

1.3.1 Triple Fluid Jet Grouting

1.3.2 Alternative Jet Grouting

1.3.3 Jet Grouting Contractor

1.3.4 Jet Grouting Personnel

1.3.5 Site Safety and Health Officer (SSHO)

1.3.6 Geotechnical Instrumentation Engineer

1.3.7 Jet Grout Permanent Cutoff Wall

1.3.8 Cutoff Wall Thickness Formed By Soil-Cement

1.3.9 Working Platform

1.3.10 Jet Grout Cutoff Wall Cover

1.3.11 Waterside Blanket (Low Permeability Fill Material)

1.3.12 Triple Fluid Jetting Monitor and Alternative Jetting Monitor

1.3.12.1 Triple Fluid Jetting Monitor

1.3.12.1 Alternative Jetting Monitor

1.3.13 Drilling Deviation Measurements

1.3.14 Bottom Hole Pressure

1.3.15 Rotary Exploratory Drilling

1.3.16 Borehole Camera

1.3.17 Borehole Camera Specialist

1.3.18 Electronic Water Level Gauge (Pressure Troll)

1.3.19 Jet Grout Waste

1.3.20 Jet Grout Waste Management

1.3.21 Waste Management Ditch

1.4 ADMINISTRATIVE REQUIREMENTS

1.4.1 Schedule

1.4.2 Sequence of Operations

1.5 SUBMITTALS

1.5.1 Procedural Work Plan

1.5.2 Working Platform Design and Installation Procedure

1.5.3 Jet Grout Cutoff Wall Installation Procedures and Parameters

1.5.3.1 Pre-Production Jet Grout Cutoff Wall Installation

1.5.4 Grout Batch Plant and High Pressure Pumping Certification

Program

1.5.5 Plans of Action for Response Value for Bridge Abutments and

Utilities

1.5.6 High Pressure Operating Safety Manual

1.5.7 Control and Handling of Jet Grout Waste

1.5.8 Survey System for Cutoff Wall

1.5.9 QA/QC Casing Installation

1.5.10 In-Situ Water Pressure Testing

1.5.11 Layout of Jet Grout Equipment

1.5.12 Borehole Camera

1.5.13 Jet Grout Equipment

35 41 17 - 1 Amendment 0002

1.5.14 Instruments for Drilling Deviation Measurements

1.5.15 Equipment and Procedures to Obtain Samples

1.5.16 Jet Grout Samples

1.5.17 Field Calibration Test Report for Drilling Deviation

Inclinometer

1.5.18 Quality Control Test Reports

1.5.19 Results of Cement Grout Mixes with Water Compatibility

1.5.20 Factory Calibration on Instruments Used for Control of Jet

Grouting

1.5.21 Factory Calibration on Drilling Deviation / Inclinometer and

Borehole Surveying Instruments

1.5.22 Cement Certification

1.5.23 Weigh Bills and Disposal Records for Jet Grout Waste

1.5.24 Draft Pre-Production Report

1.5.25 Final Report

1.6 QUALITY ASSURANCE

1.7 GEOTECHNICAL SITE CONDITIONS

1.7.1 Explorations

1.7.2 Contractor's Responsibility

1.7.3 Modifications to the Jet Grout Cutoff Wall Depth

PART 2 PRODUCTS

2.1 EQUIPMENT

2.1.1 General

2.1.2 Jet Grout Drilling Equipment

2.1.3 Jet Grouting Rods and Monitor

2.1.4 Grout Batch Plant and High Pressure Pumping Equipment

2.1.4.1 Grout Plant and High Pressure Pump Certification Program

2.1.4.2 Real Time Data Acquisition During Grout Plant

Certification, Pre-production and Production Jet Grouting

2.1.5 Equipment Weight, Speed, and Width

2.1.6 Jet Grout Equipment

2.1.7 Layout of Jet Grout Equipment

2.1.8 Borehole Camera

2.1.9 Electronic Water Level Gauge (Pressure Troll)

2.2 MATERIALS

2.2.1 Portland Cement

2.2.2 Drilling Fluids and Admixtures

2.2.3 Water

2.2.4 Cement Grout For Injection

2.3 MATERIAL STORAGE FACILITIES

2.4 ENVIRONMENTAL PROTECTION

PART 3 EXECUTION

3.1 SITE PREPARATION

3.2 SURVEYS AND MARKERS

3.2.1 Deformation Monitoring Points

3.2.1.1 Pre-Production Columns

3.2.1.2 Production Columns

3.2.1.3 Geotechnical Instrumentation Engineer

3.3 DRILLING AND JET GROUTING SEQUENCE

3.3.1 Horizontal and Vertical Alignment Tolerances

3.3.2 Drilling Deviation Measurement Calibration

3.3.2.1 Data Reduction Program

3.3.3 Pre-production Jet Grouting Stage

3.3.4 Production Jet Grouting Stage

3.3.5 Variation in Triple Fluid or Alternative Jet Grouting

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3.3.6 Working Surface

3.3.7 Triple Fluid or Alternative Jet Grouting Work

3.4 PERFORMANCE REQUIREMENTS FOR JET GROUT CUTOFF WALL

3.4.1 Wall Continuity of Soil-Cement Cutoff Wall

3.4.2 In-situ Hydraulic Conductivity Requirements

3.4.2.1 Laboratory Hydraulic Conductivity

3.4.3 Evaluating Compliance of the Cutoff Wall

3.4.4 Displacement Response Values

3.5 CLEAN UP AND SITE RESTORATION

3.6 DISPOSAL OF WASTES

3.7 QUALITY CONTROL

3.7.1 Jet Grout Soil-Cement Samples

3.7.1.1 Fresh Cement Grout Cubes and Density Measurements

3.7.1.2 Fabrication of Cutting Samples

3.7.1.3 Core Drilling and Cored Samples

3.7.1.4 Rotary Exploratory Holes

3.7.2 Jet Grout Compressive Strength Testing

3.7.2.1 Jet Grout Comprehensive Strength Testing on Fresh Grout

Cubes

3.7.2.2 Jet Grout Comprehensive Strength Testing on Hardened

Cuttings

3.7.2.3 Jet Grout Comprehensive Strength Testing on Hardened Core

Samples

3.7.3 Permeability Testing

3.7.3.1 Laboratory Testing on Cored Samples

3.7.3.2 In-Situ Water Pressure Testing

3.7.3.2.1 Constant Head / Falling Head Test (Stage 1)

3.7.3.2.2 Water Pump Test / Rising Head Recovery (Stage 2)

3.7.4 Cutoff Wall Measurements

3.8 RECORDS

3.8.1 As-Built Plan and Elevation of Jet Grout Cutoff Wall

3.8.2 Results

3.8.3 Construction Log

3.9 FIELD QUALITY CONTROL

-- End of Section Table of Contents --

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SECTION 35 41 17

JET GROUT CUTOFF WALL

PART 1 GENERAL

1.1 SUMMARY

The work covered by this section of the specifications consists of furnishing all plant, labor, equipment, materials, and of performing all operations in connection with the construction of the jet grout cutoff walls on the slope of the levee embankment and also in unrestricted and low overhead conditions beneath the H Street Bridge crossing the American River. The jet grout cutoff wall will serve as a permanent seepage barrier that has been designed for long-term sustainability. All jet grouting will be performed in accordance with these specifications and applicable drawings.

As part of the pre-production work, the jet grout contractor shall demonstrate at the test location indicated in the construction drawings their capability to form a minimum (3) three foot thick continuous cutoff wall using single or multiple rows of overlapping columns. These pre-production columns will be formed along the cutoff wall alignment using the jet grouting process identified in the Contractor's responses to the Request for Proposal (RFP) of this solicitation.

The drilling and jet grouting performed during the pre-production phase shall be based upon the Contractor's responses to the Specialized Technical Capabilities, as identified in the RFP. The pre-production work shall be evaluated by the Contractor, who will submit a report providing the details of their means and methods for conducting the production jet grouting. The Contracting Officer shall approve the report prior to starting the production work. Any non-compliant jet grout columns formed during the pre-production jet grouting shall be repaired by the Contractor prior to starting the production work.

One aspect of the quality control program for this project shall consist of real time data collection of the drilling and jet grouting parameters (as specified herein). Every jet grout column shall have a drilling deviation measurement taken prior to conducting the jet grouting for the purpose of assessing the as-built geometry and thickness of the cutoff wall.

Validation that the cutoff wall was constructed in accordance with these Specifications shall be performed by the Contractor with results provided to the Contracting Officer. Coreholes shall be drilled through the cutoff wall, to the full installation depth, within the overlap area of adjacent columns. The corehole interval and final locations shall be directed by the Contracting Officer. Hydraulic conductivity tests shall also be performed in-situ for each corehole (as described herein). Laboratory flexible wall triaxial conductivity tests shall be performed on the cores extracted from the wall, especially near the bottom of the cutoff wall, as requested by the Contracting Officer. In addition, visual confirmation through borehole camera surveys shall be performed inside each corehole.

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1.2 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by basic designation only.

ASTM INTERNATIONAL (ASTM)

ASTM C109/C109M (2011b) Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or (50-mm) Cube Specimens)

ASTM C150/C150M (2012) Standard Specification for Portland Cement

ASTM C511 (2009) Standard Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of Hydraulic Cements and Concretes

ASTM D698 (2012) Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-lbf/cu. ft. (600 kN-m/cu. m.))

ASTM D4832 (2010) Preparation and Testing of Controlled Low Strength Material (CLSM) Test Cylinders

ASTM D5084 (2010) Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter

1.3 DEFINITIONS

The terms used as part of this soliciation are defined in this section are as follows:

1.3.1 Triple Fluid Jet Grouting

Triple fluid jet grouting is a system in which the jet grout rods are designed to simultaneously inject three different fluids through horizontally projecting nozzles, in which a cone of compressed air shrouds a high velocity water jet, with the third fluid being a stable high speed cement grout jet. The use (or zero use) of compressed air does not change the basic triple fluid process, which helps to assure minimal ground movements. This triple fluid process excavates the in-situ soil using the high speed coherent air/water jets while simultaneously injecting a high speed grout. This grout is mixed into the soil, which then forms a cutoff wall of soil-cement. Typically, the grout jet is located about three (3) feet below the point where the air/water jet is located. The jetting rod is first drilled into the ground, and then the jet grouting process commences as an upstage grouting process. The jetting rod is slowly rotated and incrementally lifted at a constant speed over a specified lift increment. The triple fluid process shall produce a homogeneous mixing of the soil and grout which will form a continuous cutoff wall that is technically compliant with the requirements of this jet grout specification. In order to minimize the potential for movement of the

35 41 17 - 5 storm sewer drain or other pipes, there shall be strict limitations placed upon the air pressure and flow rate, as specified herein.

1.3.2 Alternative Jet Grouting

Alternative jet grouting, as defined in this specification, shall consist of any other form of jet grouting in which zero compressed air (flow rate and pressure) are used during the drilling or injection stage. The drilling/jetting rods (for the zero compressed air system) shall be drilled into the ground, and then the jet grouting process commences as an upstage grouting process with zero compressed air. The jetting rod is slowly rotated and incrementally lifted at a constant speed over a specified lift increment. The alternative jet grouting process shall produce a homogeneous mixing of the soil and grout which will form a continuous cutoff wall that is technically compliant with the requirements of this jet grout specification.

1.3.3 Jet Grouting Contractor

The Jet Grouting Contractor is the Prime Contractor for the project and is responsible for providing the cutoff wall in accordance with these specifications and associated construction drawings.

1.3.4 Jet Grouting Personnel

Thirty (30) days prior to any jet grout work, the names and corresponding responsibilities for the six (6) key personnel listed below shall be provided to the Contracting Officer:

a. Jet Grouting Project Manager

b. Jet Grouting QC/QA Manager

c. Jet Grouting Superintendent

d. Jet Grouting Drill Operator

e. Jet Grouting Grout Plant Operator

f. Jet Grouting Safety Officer

Each of the above personnel shall remain in their assigned capacity for the duration of the project, and can only be replaced with a written acceptance by the Contracting Officer.

1.3.5 Site Safety and Health Officer (SSHO)

For additional information and requirements of the Contractor appointed Site Safety and Health Officer, refer to Section 01 35 26, GOVERNMENTAL

SAFETY REQUIREMENTS.

1.3.6 Geotechnical Instrumentation Engineer

The Geotechnical Instrumentation Engineer who is a registered Professional Engineer in the State of California, who has a minimum of a Bachelor of Science degree in Civil Engineering, and who has at least 5 years of experience in installation and monitoring the types of instruments specified herein and in interpreting instrumentation data. A suitably qualified Registered Engineering Geologist in the State of California with the instrumentation experience is also acceptable as the Geotechnical Instrumentation Engineer.

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1.3.7 Jet Grout Permanent Cutoff Wall

The jet grout permanent cutoff wall is a vertical cutoff wall formed from a series of overlapping triple fluid jet grout or alternative jet grout columns aligned along single or multiple rows to form a minimum three (3) foot thick cutoff wall. The cutoff wall impedes the flow of groundwater in order to control through seepage and/or underseepage. The cutoff wall shall have a minimum hydraulic conductivity obtained from both in-situ and flexible wall conductivity tests (as specified herein).

1.3.8 Cutoff Wall Thickness Formed By Soil-Cement

Soil-cement is the resultant condition of the jet grouting process, where the injected grout uniformly mixes with the in-situ soil. The mechanical properties of the soil-cement are specified herein. The three-foot thick soil-cement cutoff wall must be constructed with a high level of quality control and quality assurance to have a long-term sustainability.

The three foot thickness of the compliant soil-cement which forms the cutoff wall, shall be measured as:

1) For single line of columns: the minimum thickness of the as-built barrier wall defined at the overlap of adjacent, full cylindrical jet grout columns.

2) For two lines of columns: is the sum of the minimum thickness for each line of columns which form a continuous cutoff wall between columns in line one and columns in line two and; whereby the minimum thickness of each line of columns is calculated as above for part (1) for a single line of columns.

1.3.9 Working Platform

The working platform is defined as the surface from which the jet grout cutoff wall is constructed. The platform will be constructed by the jet grout Contractor along the alignment of the cutoff wall, as required for construction.

The working platform shall also be constructed to allow for containment and management of the drilling and jet grout cuttings. Ensure that the working platform provides adequate safety and containment measures so that no erosion of the embankment occurs. The working platform shall also be cleaned at the end of each jet grout installation shift.

1.3.10 Jet Grout Cutoff Wall Cover

The jet grout cutoff wall cover is a zone of compacted impervious fill and/or approved jet grout cuttings placed between the top of the jet grout cutoff wall and the final grade to be restored prior to placement of any surface treatment such as asphalt wearing surfaces, or aggregate surface course where the levee crown or trench in the levee crown is excavated to facilitate the jet grouting operation.

1.3.11 Waterside Blanket (Low Permeability Fill Material)

Waterside blanket (low permeability fill material) is defined in SECTION

31 00 00 EARTHWORK.

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1.3.12 Triple Fluid Jetting Monitor and Alternative Jetting Monitor

1.3.12.1 Triple Fluid Jetting Monitor

The triple fluid jetting monitor is the rod appliance attached to the drill rods which holds and regulates the water, air, and cement jets. The triple fluid monitor shall be able to inject compressed air at zero flow rate and air pressure and up to a maximum air flow rate of 105 cubic feet at net 102 pounds per square inch (psi) (3 cubic meters per minute at net 7 bars above the bottom hole pressure).

1.3.12.1 Alternative Jetting Monitor

The alternative jetting monitor is the rod appliance attached to the drill rods which holds and regulates any water or cement jet(s) used during the alternative jet grouting process. The alternative jetting monitor shall not have any capabilities to inject compressed air (zero flow rate and air pressure).

1.3.13 Drilling Deviation Measurements

A drilling deviation measurement is a method of surveying and documenting the plumbness of the drill hole, and provides a way of quantifying the actual bottom of drill hole location with respect to the theoretical or intended location. Drilling deviation measurements shall be performed for every jet grout column drill hole, quality control coring, and rotary exploratory hole, using an instrument capable of biaxial deviation measurement to determine the magnitude and azimuth of all down-the-hole deviations. The drilling deviation measurements shall be obtained over the entire length of the drill hole and within 10 feet of the bottom of the jet grout column. The instrumentation used in drilling deviation measurement shall have the capability of measuring down a depth of at least 80 feet.

Use an instrument capable of controlling or measuring the azimuth and recording the magnitude of the deviation of the instrument as it is raised inside of the jetting rods. The azimuth and magnitude of the drilling deviation measurement shall be displayed on an LCD screen which will allow the Government inspector to manually record the raw drilling deviation data. The Contractor shall use the drilling deviation data to determine the as-built geometry of the barrier wall and if the jet grouting formed a minimum three (3) foot thick cutoff wall.

1.3.14 Bottom Hole Pressure

The bottom hole pressure is the isotropic fluid pressure (at the depth of the jetting monitor), which is created by the fluid density and frictional/viscous flow of the jet grout cuttings, (soil, water, cement, and air (if used)). The cuttings induce the bottom hole pressure as they are ejected up the annular space of the drill hole and then exit at the surface to an atmospheric condition. Therefore, in order to minimize the bottom hole pressure, the drilling and jet grouting must maintain a stable borehole and also assure that a continual flush of drilling and jet grout cuttings is delivered to the surface. In the extreme, when the bottom hole pressure exceeds the fracturing potential of the in-situ soil, severe mass movement of the fractured soil occurs along with ground water movement.

This is usually coupled with uncontrolled release of compressed air, (if used). Minimizing the bottom hole pressure, and preventing heave / subsidence of existing structures is one of the most critical performance criteria for the drilling and jet grouting conducted under this contract.

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1.3.15 Rotary Exploratory Drilling

Rotary exploratory drilling shall be selected by the jetting grout contractor to produce a minimum 4-inch diameter borehole through the jet grout cutoff wall. Use the drill hole for in-situ water testing, insertion of submersible pumps, and borehole camera video recording of the soil-cement. Only water shall be used as the drilling fluid.

1.3.16 Borehole Camera

The borehole camera is a closed circuit television (CCTV) video camera and shall be used in conjunction with cored boreholes or rotary exploratory holes in the jet grouted cutoff wall. The bore hole camera shall be capable of fitting inside of all holes drilled at the overlap of adjacent jet grout columns. The camera shall also be capable of viewing directly down hole, as well as the sidewalls of all holes, along the entire length of the hole and be able to operate in either a dry or water-filled borehole.

The borehole camera shall be equipped with a removable compass suspended from the lowest portion of the camera frame, at a distance where the camera can view and record the azimuth reading within the borehole.

1.3.17 Borehole Camera Specialist

Individuals with at least 3 years' experience in the past 5 years in the operation and maintenance of borehole cameras and field operated video recording equipment.

1.3.18 Electronic Water Level Gauge (Pressure Troll)

An electronic water level gauge, or pressure troll, is an in-hole electronic water level instrument with pocket PC data logging capabilities.

The pressure troll shall be used to precisely monitor the water level changes and water temperature during the pump and recovery phases of the various in-situ water testing of the cutoff wall.

1.3.19 Jet Grout Waste

Jet Grout waste is material which is generated during the drilling and jet grouting process. These waste products include: jet grouting cuttings, (soil, water, cement, air (if used)), wash water, unused grout and any other liquids and debris generated in support of the jet grouting process.

These waste products, after being allowed to solidify for a period of time, will be considered ordinary construction debris for the purposes of planning the disposal requirements. Recycling of the supernatant water will be required to the extent that is feasible. A disposal avenue for the remaining unrecyclable high pH waste water is not currently known, and any additional materials may need to be added to lower the pH to an acceptable and disposable condition. Any additional cement requirements required to solidify, or speed up solidification process, the waste material to a disposable condition shall be factored into the Contractors bid.

1.3.20 Jet Grout Waste Management

Waste Management is defined as the handling, transport, and disposal of all waste materials generated by the jet grouting process (soil, water, cement, air (if used)), wash water, unused grout and any other liquids and debris generated in support of the cutoff wall installation), and shall be the responsibility of the jet grout Contractor. Provide earthen ramps or

35 41 17 - 9 equivalent to allow for trapped animals to escape from jet grout waste pits.

1.3.21 Waste Management Ditch

The waste management ditch is a drainage trench used to control and direct the flow of the jet grout cuttings to a sump, which is then pumped to the waste management area for curing.

1.4 ADMINISTRATIVE REQUIREMENTS

1.4.1 Schedule

The schedule for production jet grouting shall be based as indicated in Section 00 73 05, SUPPLEMENTARY CONDITION REQUIREMENTS FOR SITES R7 AND L7, in paragraph "SCR-3 Allowable Time, Schedule Constraints and Time of Completion." An alternate start date may be required by the Government, and verification shall be coordinated with the Contracting Officer following the Notice to Proceed. The schedule shall reflect milestone dates for critical sequence of operations tasks as described in paragraph 1.4.2, Sequence of Operations. The schedule shall be prepared using Primavera software, or Government approved equal, and shall be submitted to the Contracting Officer for approval 40 days following the Notice to Proceed. In order to meet the requirements of the owners, night shifts and or double shift (may include night shifts) operations may be needed.

The Jet Grout Contractor is alerted to the allowable work hours as indicated in Section 01 00 00 GENERAL REQUIREMENTS, in paragraph 1.9, Special Construction Conditions.

An updated project schedule shall be prepared and submitted to the Contracting Officer with the Jet Grout Contractor's monthly invoices. The Jet Grout Contractor shall identify any delays, or if a delay in the primary activities is anticipated, and indicate how they will adjust resources to maintain milestones required for project completion.

1.4.2 Sequence of Operations

The Contractor prepared schedule shall describe the sequence of operations for all activities relating to the installation of the jet grout cutoff wall. The sequence of operations, at a minimum, shall include the following tasks:

1. Pre-construction document preparation and coordination with Government and County and City Officials

2. Mobilization

3. Staging Areas(s) site preparation

4. Drainage trench installation

5. Pre-production phase (test section); Installing tangent columns in three clusters of two columns each (minimum per cluster), with each cluster forming a compliant barrier wall.

6. Quality Control/Quality Assurance (QA/QC) and coring of the three clusters of pre-production columns, perform technical evaluation and produce a test report, and obtain acceptance of means and methods to perform production work.

7. Waste management and disposal

8. Full production phase, including column layout and spacing

9. QA/QC and coring of production columns

10. Site and staging area restoration

11. Demobilization

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It shall be required to perform the grout plant certification, field calibration of drilling deviation instruments, and pre-production jet grout work in its entirety, prior to commencement of the production jet grout cutoff wall installation.

1.5 SUBMITTALS

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

submittals not having a designation are for information only.

Pre-construction submittals, shop drawings, and product data shall be sent to the Government within 40 calendar days after the Notice to Proceed. The Jet Grout Contractor is responsible for modifying/amending all submittal documents to address any subsequent government comments during the approval process. Submit the following in accordance with specification SECTION

01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Schedule and Sequence of Operations; G

Procedural Work Plan; G

Jet Grout Cutoff Wall Installation Procedures and Parameters; G

Grout Batch Plant and High Pressure Pumping Certification Program;

G

Plans of Action for Response Value; G

High Pressure Operating Safety Manual; G

Control and Disposal of Jet Grout Waste; G

Survey System for Cutoff Wall; G

QA/QC Casing Installation; G

In-Situ Water Pressure Testing; G

SD-02 Shop Drawings

Layout of Jet Grout Equipment; G

SD-03 Product Data

Borehole Camera; G

Jet Grout Equipment; G

Instruments for Drilling Deviation Measurements; G

Equipment and Procedures for Rotary Exploratory Drilling; G

Equipment and Procedures to Obtain Samples; G

SD-04 Samples

Jet Grout Samples

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Soil-Cement Samples

SD-06 Test Reports

Draft Pre-Production Reports; G

Quality Control Testing and Reports; G

Results of Cement Grout Mixes with Water Compatibility;G

SD-07 Certificates

Factory Calibrations on Instruments Used for Control of Jet Grouting

Factory Calibration on Drilling Deviation / Inclinometer and Borehole Surveying Instruments

Cement Certification

Weigh Bills for Jet Grout Waste

SD-11 Closeout Submittals

Final Pre-Production Report; G

Final Report; G as-built plan and elevation view of the cutoff wall

1.5.1 Procedural Work Plan

The Jet Grout Contractor must prepare a procedural work plan that demonstrates their knowledge of the project requirements. The procedural work plan shall include appropriate descriptions related to all aspects of performing the work including, but not limited to, the following:

- Provide the names for the Project Manager and other members of the Jet Grouting Contractor's field team including any proposed Subcontractors;

- Number of field operations personnel to be used on-site and their roles and responsibilities shall be clearly stated;

- A Contractor prepared site-specific Accident Prevention Plan (APP) and Activity Hazard Analysis (AHA), as required by Section 01 35 26

GOVERNMENTAL SAFETY REQUIREMENTS;

- A description of all equipment to be utilized in the installation and performance of the work required;

- A copy of the project Construction Site Plan, as required by Section

01 50 02 TEMPORARY CONSTRUCTION FACILITIES;

- Methodology for providing for an initial inclinometer calibration, and continuing calibration during field operations, including a proposed schedule of on-going calibrations, for all project required inclinometers;

- Schedule for providing supplemental deformation monitoring surveys, as required by Section 01 00 00, GENERAL REQUIREMENTS;

- Location of two additional full depth soil borings and groundwater monitoring well installations, as required by Section 02 02 00

SUBSURFACE DATA;

- Proposed methods for pre-production work, including: construction of

35 41 17 - 12 any working platforms prior to pre-production, drilling, drilling deviation measurement and processing of raw data, details of jet grouting and inter-axis spacing;

- Documentation method ensuring consistent reproducible results, including for all quality control measures;

- Proposed methods to install core borings through the overlapped sections of adjacent jet grouted columns to prove three (3) foot thick compliant cutoff wall, utilizing continuous coring and sampling;

- Proposed methods to perform in-situ water tests for Stage 1 and Stage 2 testing;

- Proposed method for performing borehole camera surveys, including the coincident ground water table pump down.

- Proposed method for conveying the high pressure and waste lines on the H Street Bridge across the American River;

- Proposed method for safely controlling and managing jet grout cutting/waste material from the drill location to the storage basin, and maintain the integrity of the embankment and levee; and

- Proposed methods to control noise from the grout batch plant and grout pumps/compressors;

1.5.2 Working Platform Design and Installation Procedure

The working platform shall be designed to support the static and dynamic loading of the drilling and jet grouting equipment, and all hydro-dynamic forces generated by the drilling and jet grouting procedures. The Contractor shall have a Professional Engineer (licensed in California) submit engineering calculations to support their working platform construction methods. The working platforms on the levee embankment and beneath the bridges shall have the following restrictions: excavations into the levee embankment or foundation greater in depth than those shown on the drawings shall not be permitted; additional fill required for the working platform can be placed on the levee embankment, as long as a minimum slope stability factor of safety of 1.3 is maintained for all temporary construction.

The working platform shall also be constructed to allow for containment and management of the drilling and jet grout cuttings. The working platform shall prevent any surface erosion of the embankment slope, or release of the jet grout through the face of the embankment. The working platform shall also be cleaned at the end of each jet grout installation shift.

1.5.3 Jet Grout Cutoff Wall Installation Procedures and Parameters

Provide the jet grout installation procedures and parameters to be followed for the pre-production and production phases. Details shall include a description of the jetting procedures for jet grout cutoff wall installation, drilling methods, method of supporting bore holes, drilling deviation measuring and data reduction techniques, jetting parameters to be used for pre-production and those estimated for the production work, all nozzle sizes, pump pressures, flow rates, rod rotation rates, lift speed, inter-axis spacing, column size estimates, grout formulations, volumes of waste generation, installation schedule, construction and monitoring measures to be instituted to minimize potential embankment movement and ensure the integrity of the bridge abutments. Also provide any other details of the drilling and jet grouting process requiring clarification after review of the submittal by the Contracting Officer.

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1.5.3.1 Pre-Production Jet Grout Cutoff Wall Installation

The pre-production shall consist of three clusters of columns at the locations shown on the contract drawings. In general, one cluster is at the top of slope, the second at mid-slope on the embankment, and the last cluster beneath the H Street Bridge in limited headroom. The actual number of columns and number of rows of columns shall be selected by the Contractor so that a minimum three (3) foot thick barrier wall is achieved, and being compliant with this specification. At a minimum two columns shall be installed at each cluster location, for a minimum total of six (6) columns.

The Contractor is alerted to the fact, and should take into account that the means and methods to install and test the pre-production columns must be reproducible during the installation of the production columns phase.

Therefore, all submittal documents describing the proposed pre-production installation procedures and parameters shall as closely as possible simulate the conditions for work at the site. The Contractor shall provide a brief discussion on the expected results from the pre-production test section.

Details of the Quality Assurance / Quality Control (QA/QC) testing and inspection procedures and parameters shall also be provided. The information provided shall supplement data required under other pre-construction submittals (SD-01) and product data (SD-03) items.

Following all pre-production work a Draft Pre-Production Report shall be provided as required under test reports (SD-06), which shall be approved by the Contracting Officer prior to proceeding with the production work. This submittal shall include the method and materials to be used to repair any deficient sections of the test section, so that a compliant barrier wall is created as part of the pre-production.

1.5.4 Grout Batch Plant and High Pressure Pumping Certification Program

Prior to any pre-production jet grouting, the Jet Grouting Contractor must perform a grout plant and high pressure pump certification program to verify the grout plant(s) and high pressure pumps capabilities. The Contractor shall submit a plan for how this certification program will be performed and verify that the minimum pumping capabilities have been mobilized to the project, as specified in paragraph 2.1.4. In addition the Contractor shall submit the manufacturers cut sheets covering all the grout batch plant equipment and facility capabilities (silos, screw augers, colloidal mixer, agitator, water storage) and pressure-flow-transmission settings for the high pressure pumps. For each high pressure line, the Contractor shall submit certification of the pressure rating of the hoses and fittings used to make-up the high pressure production line. The certification shall be traceable to each hose via a tag attached to each hose segment.

All instruments used in the grout plant and on the high pressure pumps shall have calibration certificates submitted to the Contracting Officer validating that the transducers are correctly recording the required data.

The Contracting Officer shall confirm the instrument serial number against the calibration certification prior to conducting any testing. The calibration certificates shall be dated no more than three months from when the Government will perform their validation.

The Contractor shall submit samples of the data acquisition output, both

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ASCII file and hardcopy output. A sample of the corresponding batch ticket printer output for the digitized data submitted shall also be provided for review.

The submittal shall define the proposed quality control measures used to manually verify that the cement grout corresponds to the density requirements of the specification, and that the Portland Cement Type I or Type II material brought to the site is compliant with the manufacturer's certification.

The Contractor shall also submit the grout cube test plan, which is consistent with the requirements of Paragraph 3.7, Quality Control, of this specification.

Once the certification program is completed, the Contractor shall submit a Grout Plant Certification Report for final approval by the Government and prior to beginning any pre-production work.

1.5.5 Plans of Action for Response Value for Bridge Abutments and Utilities

Submit within 40 calendar days after the Notice to Proceed, for review and acceptance, a generalized plan of action to be implemented in the event any "Displacement Response Values" is reached or the observations indicate the potential for distress to any adjacent bridge abutments or pile bents, or utilities. The generalized plans of action shall be positive measures by the Contractor to do the following items:

1. Stop jet grouting immediately;

2. Contact the City of Sacramento for inspection, review, and coordination of the structure involved;

3. Quantify any/all damage to the adjacent structures, and utilities that may need immediate attention and repair. Coordinate with the City of Sacramento based on the structure involved for any additional exploratory measures that may need to be performed.

4. Develop a plan to proceed forward with jet grouting such that the 0.25-inch maximum displacement (lateral or vertical displacement) will not be exceeded on any portion of bridge abutments or pile bents, or utilities. The Plan shall be approved by both Contracting Officer and the City of Sacramento prior to moving forward.

5. Develop a plan to repair or replace any City of Sacramento damaged facilities. Any repair or replacement required shall be to the satisfaction of the City.

1.5.6 High Pressure Operating Safety Manual

The Contractor is responsible for the safety of its personnel and equipment. The Jet Grouting Contractor will establish safety protocols and provide safety training to all personnel prior to ingress onto the site, as it relates to operating and working within the vicinity of high pressure pumps, lines, valves, grout plant, and jet grouting activities on the project site. A high pressure operating safety manual shall be developed which contains the manufacture's names, telephone numbers and certificates relating to the safe operation of all pressure lines, valves, connections, blow-off valves, and any other items which operate under pressure (air or liquid). The manual will contain pump pressure characteristics used for the

35 41 17 - 15 project, including: pressure-flow-transmission setting curves for high pressure pump, and piston size. The manual will clearly identify the name, phone number, and location of Contractor-appointed high pressure safety officer. Each member of jet grouting crew and all on-site personnel will sign the safety manual after receiving appropriate instruction. Any safety infractions and or incidences shall be kept as a log entry in the safety manual. A copy of the manual shall be available on site for review by the Government or their representative at all times. The safety manual shall be submitted within 40 calendar days after the Notice to Proceed and mobilization of jet grouting equipment shall not proceed until approved by the Government.

The Contractor shall establish and provide a plan in the safety manual covering the details of implementing a high pressure pumping safety corridor from the grout batch plant to their drill. The Contractor shall show how their safety corridor will prevent any personnel or pedestrians from being exposed to the high pressure fluids used for jet grouting.

The Contractor shall submit in the safety plan sketches, diagrams, and manufacturer's operating manuals on all safety valves used in controlling maximum pressure in jet grouting and waste conveyance lines. The Contractor shall also provide a plan demonstrating the effectiveness of the safety valves and any required maintenance. Demonstration of each valves operation shall be provided during the high pressure pump certification testing.

The Contractor shall submit details of how operators at the drill rig will keep in constant communication with the high pressure pump operator. The Contractor shall provide a communication system which will not solely rely upon hand held devices and provides a high level of assurance that high pressure pumping can be stopped quickly (i.e. 10 seconds or less).

1.5.7 Control and Handling of Jet Grout Waste

As part of this submittal the Contractor shall prepare a site-specific plan for the control and handling of all jet grout waste. The plan shall describe in detail the process and procedure, as well as equipment to be used and their location, for the transport of jet grout waste material from the injection point to the waste management basin and subsequent off-haul to the local landfill or material recycling facility. Contact information and location for the material disposal facility shall be provided, along with haul routes from the project site. Waste disposal facility acceptance criteria, required testing, and any other required certifications shall also be confirmed and provided.

The Contractor shall provide an initial estimate of the amount of waste material expected to be generated during construction based upon the COntractor's experience from previous case histories. This estimate shall be used to validate the cutoff wall installation schedule as it relates to the available volume at the waste management disposal site.

The Contractor shall also provide grading and operation details for the waste management basin. The details provided shall describe the cell dimensions, volumes, PVC liner type and bury depth, equipment to be used in removing material, and any additional waste management components.

The Contractor shall specifically discuss how solid and liquid waste will be managed to ensure containment with the project limits and in ensuring minimal impact to roadway traffic or public health and safety.

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The Contractor shall obtain a letter from the disposal site stating that they accept the jet grout waste material as a part of the Control and Disposal of Jet Grout Waste.

1.5.8 Survey System for Cutoff Wall

As part of this submittal, a survey system for locating the cutoff wall alignment and wall elevations and relating them to the contract drawings shall be established by the Contractor and submitted to the Contracting Officer. A survey system for locating the center of each jet grout drill hole shall be established by the Contractor and submitted to the Contracting Officer for approval. The locating system shall be able to re-locate the drill hole center within 1-inch of the location initially used to perform the injection.

In addition, the Contractor shall describe a permanent surface marker (such as an embedded ¾ inch iron pipe) to be installed following reconstruction of the levee and access road, identifying both end points for the jet grout cutoff wall.

1.5.9 QA/QC Casing Installation

As part of this submittal, the Contractor shall submit a plan detailing the installation process for the required continuous steel casing connecting the working platform to the top of jet grout column. This plan shall indicate the methodology for casing installation, including the means of providing a watertight seal between the top of the jet grout column. Casing size provided shall be large enough to accommodate all testing and inspection equipment.

1.5.10 In-Situ Water Pressure Testing

As part of this submittal, the Contractor shall provide data on all equipment and materials to be used, and provide a plan discussing the details for performing the in-situ water pressure testing and data reduction. Testing shall be provided in two stages, as described in sub-section 3.7.3.2.

The Contractor shall provide sample data tables and discuss how the water head - time data reduction methods are to be used in calculating the hydraulic conductivity of the cutoff wall.

The Contractor shall submit the analytical or numerical method(s) of analysis used for the water testing data to obtain a hydraulic conductivity value. The Contractor shall document (in English units) all aspects of the theory and assumptions used to analyze the field data.

Prior to any testing, the Contractor shall provide calibration certificates, less than 60 days old from the start of testing, on all pressure gauges and flow meters used during the in-situ water pressure testing.

This submittal shall also describe the following items:

a) The proposed method and procedures for performing the in-situ water pressure testing

b) Proposed method and procedures for performing additional in-situ water pressure testing on repaired cutoff wall segments.

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c) Data on coring equipment and materials shall include the type of drilling/coring to create the test borehole, size and lengths of casing, and casing installation procedures to assure a water-tight seal as described in 1.5.9.

d) Data on equipment shall include manufacturers cut sheets on size and capacity of water pumps for maintaining a constant head, and manufacturers cut sheets for the in-hole pressure trolls used to monitor the water level during the constant head and falling head phase of in-situ testing. The Contractor shall submit procedures for collecting and analyzing all flow rate-time-water level data from these pump tests, which will also be used to calculate the in-situ permeability of the soil-cement above the water table.

e) For the slug removal/rising head phase of testing, the Contractor shall specify the pump size and geometry, and shall provide pump characteristic curves and manufacturer's operating manual for the in-hole submersible pump proposed for use. The Contractor shall provide manufacturers cut sheets for the in-hole pressure troll used to monitor the water level inside of the corehole. The Contractor shall provide manufacturer's information and details for the borehole camera. The Contractor shall provide sketches of how all equipment (pump, camera, and pressure troll) will be simultaneously inserted into the borehole for observing the quality of the in-situ soil-cement under external water pressure. The Contractor shall submit procedures for collecting and analyzing all flow rate-time-water level data from these pump tests, which will be used to calculate the in-situ permeability of the soil-cement below the water table. The video footage from the borehole camera will be used (along with other data) to assess the quality of the soil-cement within the jet grout treatment.

f) As it relates to the required core hole camera surveys, the Contractor shall also provide the details of how the water level will be keep low enough to accommodate a full core hole survey in a dry hole.

1.5.11 Layout of Jet Grout Equipment

The Contractor shall provide a plan detailing the layout of all jet grouting equipment including, but not limited to, grout mixing equipment, injection equipment, pumps, high pressure hoses, location of the high pressure safety corridor, waste management areas, and a description of how the equipment will be located to support each phase of column installation.

Contractor shall provide the details of their pumping corridor used to convey the high pressure and waste lines across the H Street Bridge across the American River. Additionally, a traffic flow plan for daily cement deliveries to the batch plant shall be provided. This description shall be in accordance with the details required under paragraph 1.5.1, Procedural Work Plan. It shall also describe where all equipment will be temporarily stored when not in use. This plan, detailing the layout of jet grout equipment, shall also be prepared to appropriately supplement the submittal requirements of Section 01 50 02, TEMPORARY CONSTRUCTION FACILITIES, and construction site plan.

1.5.12 Borehole Camera

As part of this submittal, the Contractor shall provide detail drawings for the borehole camera to be used inside the boreholes as specified, and all rotary exploratory holes. Manufacturer's data specification sheets and

35 41 17 - 18 operations manuals shall be included in the submittal for review. The submittal shall indicate the capabilities of the encoder to provide date and time stamps on the video. Three (3) copies of digital DVD's for all borehole camera surveys shall be submitted to the Contracting Officer within 24 hours of performing the survey.

1.5.13 Jet Grout Equipment

As part of this submittal, data on all equipment (drilling, grout batching, high pressure pumps, jet grouting, waste management) which will be used in the cutoff wall construction on this project, as well as the equipment to be used for construction quality control testing (performed in the field and/or laboratory), shall be provided.

The Contractor shall additionally provide project case history data demonstrating the proposed equipment is capable of performing the work.

The Contractor shall also submit physical samples of their proposed nozzles for the jet grouting system selected by the Contractor. Contracting Officer shall perform nozzle size measurement and verification. All jets used during jet grouting shall be available for inspection and verification through the duration of the project, as may be requested by the Contracting Officer. All jets shall be returned to the Contactor following verification.

1.5.14 Instruments for Drilling Deviation Measurements

Drilling deviation measurements shall be performed for every jet grout column drill hole, coring and rotary exploratory hole using an instrument capable of compass and biaxial deviation measurements to determine the magnitude and azimuth of all down-the-hole deviations.

Contractor shall submit a detailed plan describing the use of their in-rod drilling deviation measurement instruments and recording system, and show that it can be used for every hole anticipated on the project. The Contractor shall provide evidence that their instrument is capable of both measuring and recording the compass direction and biaxial deviations of the drill rods to determine the resultant magnitude and azimuth of all hole deviations. The Contractor shall provide data which demonstrates that the drilling deviation measurements can be performed over the entire drill hole length (up to 80 feet) and within 10 feet of the bottom of the jet grout column.

The Contractor shall provide sketches of the drilling deviation instrument intended to fit inside the jetting rods for down-the-hole measurements.