33_05_23.13.pdf

SECTION TABLE OF CONTENTS

DIVISION 33 - UTILITIES

SECTION 33 05 23.13

UTILITY HORIZONTAL DIRECTIONAL DRILLING

11/13

PART 1 GENERAL

1.1 REFERENCES

1.2 QUALITY CONTROL

1.2.1 Qualifications

1.2.2 Safety

PART 2 PRODUCTS

2.1 Pipe

2.2 MATERIALS

2.2.1 Drilling Fluids

PART 3 EXECUTION

3.1 [Enter Appropriate Subpart Title Here]

3.2 INSTALLATION

3.2.1 Drill Set-Up

3.2.1.1 Drilling Fluids

3.2.2 Drill Entrance and Exit Pits

3.2.3 Drill Entrance and Exit Angle

3.2.4 Pilot Hole

3.2.5 Reaming

3.2.6 Pull Back

3.2.7 Drilling Fluids Disposal

3.2.8 Connection of Product Pipe to Pipeline

3.3 FIELD QUALITY CONTROL

3.4 CLOSEOUT ACTIVITIES

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SECTION 33 05 23.13

UTILITY HORIZONTAL DIRECTIONAL DRILLING

11/13

PART 1 GENERAL

1.1 REFERENCES

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

U.S. NATIONAL ARCHIVES AND RECORDS ADMINISTRATION (NARA)

29 CFR 1926.652 Safety and Health Regulations for Construction; Subpart P, Excavations;

Requirements for Protective Systems

SUBMITTALS

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

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Statement of Qualifications and Records; G

Drill Plan

SD-03 Product Data

Polyethylene Pipe; G

Drilling Fluids; G

Additives; G

Mixtures; G

Safety Data Sheets SD-07 Certificates

Drill Rod

SD-11 Closeout Submittals

Record Drawings

Complete Work Logs of Guided Directional Drill Operations

1.2 QUALITY CONTROL

1.2.1 Qualifications

Ensure that the field supervisor and workers assigned to this project are experienced in work of this nature and have successfully completed similar projects of similar length, pipe type, pipe size, and soil type using

SECTION 33 05 23.13 Page 2 directional drilling in the last three (3) years. As part of the bid submission, submit a description of such project(s) which include, at a minimum, a listing of the location(s), date of project(s), owner, pipe type, size installed, length of installation, type, and manufacturer of equipment used, and other information relevant to the successful completion of the project.

1.2.2 Safety

Include in the directional drilling equipment machine safety requirements a common grounding system to prevent electrical shock in the event of underground electrical cable strike. Ensure the grounding system connects all pieces of interconnecting machinery; the drill, mud mixing system, drill power unit, drill rod trailer, operators booth, worker grounding mats, and any other interconnected equipment to a common ground. Equip the drill with an "electrical strike" audible and visual warning system that notifies the system operators of an electrical strike.

DELIVERY, STORAGE, AND HANDLING

Prior to commencement of the work, submit the following:

a. Polyethylene Pipe

b. Safety Data Sheets

c. Statement of Qualifications and Records

Provide written documentation of conformance with AASHTO T 180. Submit a complete list of all drilling fluids, additives, and mixtures to be used along with Safety Data Sheets with 15 days prior to start of work.

Inspect materials delivered to the site for damage. All materials found during inspection or during the progress of work to have cracks, flaws, surface abrasions, or other defects will be rejected. Remove defective materials from the job site.

PART 2 PRODUCTS EQUIPMENT

Drill Rod

Select the appropriate drill rod to be used. Submit certified statement that the drill rod has been inspected and is in satisfactory condition for its intended use.

2.1 Pipe

Install a 1.5-inch diameter polyethylene pipe, with minimum dimension ratio of SDR 11.

Existing force main piping will be abandoned in place, but contractor must place a leak proof cap on the ends of the exposed pipe to be abandoned.

2.2 MATERIALS

2.2.1 Drilling Fluids

Use a high quality drilling fluid to ensure hole stability, cuttings

SECTION 33 05 23.13 Page 3 transport, bit and electronics cooling, and hole lubrication to reduce drag on the drill pipe and the product pipe. Use only fluid with a composition which complies with all Federal, State, and local environmental regulations.

PART 3 EXECUTION

3.1 [Enter Appropriate Subpart Title Here]Drill Plan

A drill plan shall be submitted 15 days prior to commencing work. The drill shall include the following items:

a. Description of the drill rig and support vehicles.

b. Identify how many reaming passes will be made if there are to be more than one.

c. Standard Operating Procedure of proposed operating pressures

d. Description of project(s) which include, at a minimum, a listing of the location(s), date of project(s), owner, pipe type, size installed, length of installation, type, and manufacturer of equipment used, and other information relevant to the successful completion of the project.

e. Description of the tracking system the driller would use to track the progress of the pilot hole.

3.2 INSTALLATION

Ensure all utilities are located and clearly marked prior to start of excavation or drilling.

3.2.1 Drill Set-Up

Contractor shall provide a description of the drill rig and proof that it has the capability to install the proposed pipeline showing that its capacity is at least twice that of the loads anticipated during construction.

Contractor shall provide a description of the tracking system that the driller would use to track the progress of the pilot hole.

Contractor shall provide a Standard Operating Procedure of proposed operating pressures and how the drilling contractor would prevent hydrofracture from occuring.

3.2.1.1 Drilling Fluids

Mix the drilling fluid with potable water (of proper pH) to ensure no contamination is introduced into the soil during the drilling, reaming, or pipe installation process. Make any required pH adjustments.

3.2.2 Drill Entrance and Exit Pits

Drill entrance and exit pits are required. Maintain at minimum size to allow only the minimum amount of drilling fluid storage prior to transfer to mud recycling or processing system or removal from the site.

Do not allow drilling mud to flow freely on the site or around the entrance or exit pits. Remove spilled mud and restore ground to original condition.

Provide shore pits in compliance with OSHA Standards, 29 CFR 1926.652.

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]3.2.3 Drill Entrance and Exit Angle

Ensure entrance and exit angles and elevation profile maintains adequate cover to reduce risk of drilling fluid breakouts and ground exit occurs as specified herein. Ensure that entrance and exit angles generate pullback forces that do not exceed 5 percent excessive strain on the polyethylene pipe.

3.2.4 Pilot Hole

The type and size of the pilot string cutting head and the diameter of the drill pipe is at the Contractor's discretion.

Drill the pilot hole along the path shown on the plan and profile drawings. Pilot hole tolerances are as follows:

a. Vertical Tolerance: Provide minimum cover below channel bottom and culverts as specified on the plans. Pilot hole may go deeper if necessary to prevent breakout.

b. Horizontal Tolerance: Plus/minus 24-inches from the centerline of the product pipe.

c. Curve Radius: No curve is acceptable with a radius less than 300-feet

d. Entry Point Location: Make pilot hole entry point within plus/minus -

24-inches of the location shown on the drawings or as directed by the Contracting Officer in the field.

e. Exit Point Location: Make the exit point location within plus/minus - 24-inches of the location shown on the drawings or as directed by the Contracting Officer in the field.

f. Mandatory pipeline cover requirements are as shown on the drawings or as specified.

g. Documentation shall be provided by the contractor identifying how many reaming passes will be made if there are to be more than one.

h. Any misdirected or unsuccessful bores must be completely grouted shut with a cement-bentonite grout.

3.2.5 Reaming

Conduct reaming operations at the Contractor's discretion. Determine the type of back reamer to be utilized by the type of subsurface soil conditions that are encountered during the pilot hole drilling operation.

The reamer type is at the Contractor's discretion. The subsurface soil conditions are provided on Sheet C-401.

3.2.6 Pull Back

Fully assemble the entire pipeline to be installed via direction drill prior to commencement of pull back operations.

Support the pipeline during pullback operations in a manner to enable it to move freely and prevent damage. Install the pipeline in one continuous pull.

Minimize torsion stress by using a swivel to connect the pull section to the reaming assembly. Maximum allowable tensile force imposed on the pull section is not to exceed 90 percent of the pipe manufacturer's safe pull (or tensile) strength. If the pull section is made up of multiple pipe size or materials, the lowest safe pull strength value governs and the maximum allowable tensile force is not to exceed 90 percent of this value.

Minimize external pressure during installation of the pullback section in

SECTION 33 05 23.13 Page 5 the reamed hole. Replace damaged pipe resulting from external pressure at no cost to the Government. Buoyancy modification is at the discretion of the Contractor.

3.2.7 Drilling Fluids Disposal

Collect drilling fluid returns in the entrance pit, exit pit, or spoils recovery pit. Immediately clean up any drilling fluid spills or overflows from these pits.

Dispose of fluids in a manner that is in compliance with all permits and applicable Federal, State, and local regulations. Disposal of the drilling fluids may occur on approved land owned by the Government subject to written approval from the Contracting Officer. Spread the drilling slurry over the Government-approved disposal area and plow into the soil.

Conduct disposal in compliance with all relative environmental regulations, right-of-way and work space agreements, and permit requirements.

3.2.8 Connection of Product Pipe to Pipeline

After the product pipe has been successfully installed, allow the product pipe to recover for 24 hours prior to connection of the pipeline. Ensure that a sufficient length of the product pipe has been pulled through the hole so that the pull-nose is not pulled back into bore hole due to stretch recovery of the product pipe.

3.3 FIELD QUALITY CONTROL

Maintain drilling logs that accurately provide drill bit location (both horizontally and vertically). In addition, keep logs that record, as a minimum the following, every 15 minutes throughout each drill pass, back ream pass, or pipe installation pass:

a. Drilling Fluid Pressure

b. Drilling Fluid Flow Rate

c. Drill Thrust Pressure

d. Drill Pullback Pressure

e. Drill Head Torque

Make all instrumentation, readings, and logs available to the Contracting Officer at all times during operation.

3.4 CLOSEOUT ACTIVITIES

Immediately upon completion of work, remove all rubbish and debris from the job site. Remove all construction equipment and implements of service leaving the entire area involved in a neat condition acceptable of the Contracting Officer.

Immediately clean "blow holes" or "breakouts" of drilling fluid to the surface and return the surface area to its original condition. Dispose of all drilling fluids, soils, and separated materials in compliance with Federal, State, and local environmental regulations.

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Mark the final location and depth in the field to be surveyed by the government.

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