1.3.1 Jet Grouting Plan
The Contractor shall submit a Jet Grouting Plan prior to mobilization of jet grouting equipment to the site. The plan shall describe the proposed plant and equipment, layout of plant and equipment, location of boreholes, methods of drilling and supporting boreholes, construction sequence and schedule, and the layout and procedures of the test program to establish jet grouting parameters.

1.3.2 Qualifications
The Contractor shall submit evidence satisfactory to the Owner that the jet grouting supervisor is experienced in jet grouting in subsurface conditions similar to those expected at the site and that the Contractors proposed method of jet grout column construction does not differ from his specific experience. The submittal shall contain a detailed listing of completed jet grouting projects including, but not limited to, client name, client reference name and telephone contact number, project location, construction dates, and a brief summary of the project.

1.3.3 Water
The Contractor shall submit water quality tests results for any non-potable water proposed for the grout.

1.3.4 Mix Design of Soil and Grout
The Contractor shall submit a mix design report for the soil and grout mix as proposed with representative soil (at the natural moisture content) from the site and the water to be used during construction. The report shall include the source of mix materials, mix proportions, density of mix, and unconfined compressive strength at 3 and 28 days.

1.3.5 Cementitious Materials
Certificates of compliance attesting that the cementitious materials meet the requirements of the specifications shall be submitted. Cementitious material will be accepted on the basis of a manufacturer’s certificate of compliance, accompanied by mill test reports that the material(s) meet the requirements specified herein.

1.3.6 Jet Grouting Performance Records
The Contractor shall submit daily records of the execution of test and production jet grouting.

1.4.1 Contractor
The Contractor shall submit evidence for approval that the Contractor or subcontractor is experienced in jet grouting in a variety of subsurface conditions and in conditions similar to those shown. This evidence will ensure that the Contractor or subcontractor will have sufficient competent personnel to carry out the operations specified and these personnel shall have experience in this type of construction. The project manager assigned to the jet grouting portion of this project shall have a minimum of 5-years experience in performing jet grouting operations.

1.4.2 Jet Grouting Supervisor
The Contractor or its subcontractor shall employ and furnish an approved, full-time, onsite supervisor at no additional cost to the Owner. The jet grouting supervisor shall be experienced and competent in jet grouting operations with at least 2-years experience. The supervisor shall be present during jet grouting operations and shall not be assigned dual functions as Project Superintendent or Contractor Quality Control staff. 

1.5 PAYMENT

Payment shall be made at the contract lump sum price for “Jet Grouting,” which shall constitute full compensation for plant, labor, material, and equipment necessary to construct the jet gout columns as shown and specified herein. This price shall also include the cost associated with the test program and testing of the grout column specified herein.

2.1.1 Drilling Equipment shall be of a type and capacity suitable for drilling the required hole sizes and depths, and for lowering, raising, and rotating jet grout equipment to the depths and at the rates required to perform the jet grout columns as shown.

2.1.2 Jet Grouting Equipment shall consist of a single, double or triple phase fluid drill pipe, designed to form the jet grouted columns in the soil types shown and of the size and depth specified herein and shown.

2.1.3 Grout Mixing and Injection Equipment shall consist of grout mixers, holding tanks, water tanks, air compressors, and pumps of sufficient capacity to ensure adequate supply of jet grout column materials at the required pressure for a full work shift to produce grout columns in the soil types shown and of the size and depth specified herein and shown.

2.2.1 Cementitious Materials shall conform to the appropriate specifications listed.

2.2.1.1 Portland Cement shall conform to the requirements of ASTM C 150, Type I.

2.2.1.2 Mineral Fillers used as a replacement for a portion of the cement shall be fly ash, composed of finely divided siliceous residue in accordance with ASTM C 618, Class F. The maximum amount of fly ash shall not exceed 30 percent of the cement by weight.

2.2.2 Water shall be fresh, clean, potable, and free of soil, acid, salt, alkali, sewage, or phosphates. The water shall meet the following standards:

1	1. A pH of 7.0 (+/- 1.0)
2	Total dissolved solids not greater than 500 parts per million.
3	Oil, organics, acids, alkali, sewage, phosphates, or other deleterious substances not greater than 50 parts per million each.
4	Hardness less than or equal to 50 parts per million.
5	The Contractor shall furnish water quality tests results for water proposed for mixing the slurry to assure conformance with the above limits.

2.2.3 Admixtures are materials other than water, cement, sand, or mineral fillers added to the mixture immediately before or during mixing to alter its chemical or physical properties to a desired characteristic during its fluid or plastic state. Admixtures shall conform to ASTM D 494. Flowing concrete admixtures shall conform to ASTM C 1017, Type I.

2.2.4 The proportion and injection of the jet grout mix shall create jet grouted columns with a minimum 28-day unconfined compressive strength of 250 psi and a minimum 3-day unconfined compressive strength of 125 psi when tested in accordance with ASTM C 39.

3.2.1 Minimum Diameter and Spacing. The jet grout columns shall have a minimum diameter of 30 inches and a maximum edge to edge spacing of 24 inches.

3.2.2 Jet Grout Injection and Jetting Tool Rotation and Extraction Rates shall be sufficient to produce the grout columns of the diameter, length, and spacing specified herein and shown.

3.2.3 Grouting Sequence. The bore-hole drilling and jet grouting sequence shall not allow freshly grouted columns to be damaged by drilling and grouting an adjacent column.

3.2.4 Proportion and Inject Jet Grout Mix so that the grout column produced attains an unconfined compressive strength as specified the Subparagraph: Grout Column above.

3.3.1 Daily Records
The Contractor shall submit daily records during the execution of the test program and jet grouting program. The record shall include the following information:

1	Description of the work completed with a sketch identifying which columns are completed.
2	Grout column geometry (column size, length, and location).
3	Time of beginning and completion of each column.
4	Grout mix data, including mix proportions.
5	Pressure, flow rate, and density of materials used to construct each grout column.
6	Total air/water/ and grout used to construct each grout column.
7	Calculated total water/soil/grout volumes forming each column.
8	Grout rates and takes for each grout column.
9	Rate of rotation and vertical movement of jet grout equipment for each grout column.
10	Core sample locations and percent recovery.
11	Results of unconfined compressive strength test.
12	Other pertinent observation, such as: grout escapes, ground heave, or other unusual behavior.

3.3.2 Grout Column Coring
The grout columns shall be cored through the entire depth of the column in five locations selected by the Engineer. Coring shall be conducted no earlier than 36 hours after completion of the grout columns. Core recovery shall be a minimum of 85 percent.

3.3.3 Unconfined Compressive Strength Test
Unconfined compressive strength tests shall be conducted in accordance with ASTM C 39 on two samples selected by the Engineer from each core hole. One (1) sample shall be tested at 3 days and one at 28 days. Unconfined compressive strength test shall be as specified in the Subparagraph: Grout Column.