Amendment_4_Attachment_2_Revised_Sections_0004.pdf

Arkansas Valley Conduit Crowley Reach 1 Amendment No. 0004 Fryingpan-Arkansas Project, Colorado Solicitation No. 140R6026R0001

Permit Requirements Revised - 01 41 26 - 1

SECTION 01 41 26

PERMIT REQUIREMENTS

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Pass-Through Costs for Permits Researched by Government:

1. Payment: Lump-sum price offered in Price Schedule D for permits, fees, and related costs for the following except as noted:

a. Burlington Northern Santa Fe Railway:

1) Crossing insurance.

2) Crossing inspector.

3) Crossing flagger.

b. Colorado Department of Public Health and Environment (CDPHE):

1) Contaminated materials management plan review.

2) Dewatering permit.

3) COR400000 stormwater permit.

c. Colorado Department of Transportation (CDOT):

1) Access permits.

2) Highway crossing permits.

d. Town of Boone:

1) Right-of-way permit through Pueblo County.

e. Union Pacific Railroad:

1) Crossing flagger.

2) Crossing monitoring.

3) Crossing insurance.

f. Pass-through costs shall not include Contractor overhead and profit.

B. Cost:

1. Include non-pass-through costs for utility relocations in prices offered in Price Schedule A for Utility Relocation – Lumen Technologies – Non-Pass-Through and Utility Relocation – Xcel Energy – Non-Pass-Through.

2. Include non-pass-through costs for permits, fees, and related requirements in applicable prices offered in Price Schedule A.

Revised - 01 41 26 - 2

1.02 PROJECT CONDITIONS

A. Government will directly pay for (i.e., not pay through the Contractor):

1. Burlington Northern Santa Fe Railway:

a. Crossing permit for waterline.

b. Crossing permit for fiber optic line.

2. Colorado Canal:

a. Crossing permit.

3. Union Pacific Railroad:

a. Crossing permit for waterline.

b. Crossing permit for fiber optic line.

1.03 REGULATORY REQUIREMENTS

A. For additional permit requirements, refer to:

1. Section 01 35 20 – Safety and Health.

2. Section 01 51 15 – Utility Relocations.

3. Section 01 55 20 – Traffic Control.

4. Section 01 56 15 – Protection of Existing Utilities.

5. Section 01 57 15 – Utility Line Investigations.

6. Section 01 57 20 – Environmental Controls.

7. Section 01 57 30 – Water Pollution Control.

8. Section 01 57 50 – Tree and Plant Protection.

9. Section 01 57 60 – Protected Species.

10. Section 51 00 11 – Burlington Northern Santa Fe Railway Crossing Permits.

11. Section 51 00 12 – Colorado Canal Crossing Agreement.

12. Section 51 00 13 – Union Pacific Railroad Crossing Permits:

a. Furnish a copy of Union Pacific’s Contractor Minimum Safety Requirements to each employee before they enter railroad property, which is available at https://www.up.com/suppliers/new/contractor-safety.

b. Fiber optic cable systems may be buried on railroad property. In accordance with the railroad permit requirements, submit Union Pacific’s Call Before You Dig! (CBUD) form available here https://www.up.com/communities/telecom/groups.

Revised - 01 41 26 - 3

PART 2 PRODUCTS

Not Used

PART 3 EXECUTION

Not Used

END OF SECTION

Revised - 01 41 26 - 4

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Pipe Trench Earthwork Revised - 31 23 22 - 1

SECTION 31 23 22

PIPE TRENCH EARTHWORK

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Imported Backfill Material:

1. Measurement: Made to volume of imported backfill material delivered to site and used in pipe trench backfilling operations.

2. Payment: Cubic yard unit price offered in Price Schedule A.

a. Includes:

1) Cost of furnishing material only where backfill material is obtained from other sources because in-situ material is classified as unsuitable foundation material.

2) Cost for placement of material to be included in line pipe installed.

Include excavating, hauling, and processing of backfill material.

3) Disposal of unused or wasted excavated materials.

4) No payment will be made for backfill required to fill overexcavation performed by the Contractor.

B. Rock Excavation:

1. Measurement: Made to lines and grades shown on drawings and trench lengths of rock material excavated:

a. Regardless of actual widths, bottoms, and side slopes excavated, measurement will be made to lines and grades shown on drawings and to original ground or rock surface.

b. Measurement for payment for additional excavation will be made to specified trench width and depth as approved by the CO.

c. Measurement for payment will be continuous through pipe fittings.

d. Measurement for payment of excavation for concrete for pipe fittings that is outside trench excavation lines and grades will be made to lines and grades shown on drawings or to neat lines of the concrete.

2. Payment: Unit price offered in Price Schedule A.

a. Includes:

1) Mechanical breaking, shoring, sheeting, bracing, timbering, safety sloping, shoring system, and other temporary construction.

2) Pumping and unwatering.

Revised - 31 23 22 - 2

3) Removing such temporary construction unless otherwise allowed.

4) Stockpiling excavated material for backfill.

5) Disposal of unused or wasted excavated materials.

b. No payment will be made for rock excavation of pipe trenches outside specified trench width and depth.

C. Cost:

1. Include the following in price offered in Price Schedule A or B for the respective CLIN items; Line Pipe Installed (CLSM) – Price Schedule A, Line Pipe Installed (CLSM) – Optional Price Schedule B, Line Pipe Installed (Select Material), or Line Pipe Installed (Special Encasement):

a. Common Excavation:

1) Labor and materials for mechanically excavating trenches, shoring, sheeting, bracing, timbering, sloping, and other temporary construction necessary to maintain trench excavations in safe and good order during construction; removing such temporary construction where required; stockpiling excavated material for backfill; and disposal of unused or wasted excavated materials.

2) Over-excavation is Contractor’s expense.

b. Bedding and Embedment: Cost of work associated with procuring, processing, hauling, and placing of CLSM or select fill material.

c. Backfill in Pipeline Trenches:

1) Cost of work associated with excavating, processing, and hauling of necessary material:

a) CLSM or Select Material.

b) Processed Native Material.

2) Includes cost of furnishing water, moistening, and mixing material.

3) Material from required excavation used for earth materials in pipe and steel manifold trenches will be paid for both as excavation when removed from original position and as embedment or backfill when placed.

4) Volume of pipe will be deducted to embedment and backfill volume based on diameters shown on drawings, regardless of actual diameters of pipe furnished.

1.02 DEFINITIONS

A. Additional Excavation: Excavation beyond specified lines as determined by the COR and as approved by the CO to remove unsuitable foundation material.

Revised - 31 23 22 - 3

B. Cover: Distance between top surfaces of buried cables, conductors, or conduits and finished grade as defined by Reclamation Pipe Bedding and Backfill Geotechnical Training Manual No. 7.

C. Over-excavation: Excavation performed for convenience, fault, or operation of Contractor beyond specified or directed additional excavation lines.

D. Rock Excavation:

1. Material that cannot be ripped using conventional excavation equipment and requires a 400 horsepower or larger dozer tractor equipped with rock tooth ripper rated for hard rock.

2. Material that cannot be excavated with conventional excavation equipment and requires a 300 horsepower or larger hydraulic excavator, with rock bucket and teeth, specifically manufactured for rock excavation, or a hydraulic hammer (breaker, hoe-ram), in areas where it is not feasible for ripping with a dozer tractor.

3. Blasting is not permitted.

E. Unsuitable Foundation Material:

1. Materials classified as OL, OH, or peat according to ASTM D2487.

2. Materials containing vegetative waste, debris, or trash.

3. Materials contaminated by hydrocarbons or other chemical contaminants.

F. Select Material: Bedding and embedment materials meeting gradation and properties as shown on the Drawings.

G. Processed Native Material: Material excavated from the pipe trench used for backfill.

1.03 REFERENCE STANDARDS

A. American Association of State Highway and Transportation Officials (AASHTO)

1. AASHTO SSHB-02 Standard Specifications for Highway Bridges, 17th Edition

B. ASTM International (ASTM)

1. ASTM D698-12(2021) Laboratory Compaction Characteristics of Soil Using Standard Effort (12400 ft-lbf/ft^3 (600 kN-m/m^3))

2. ASTM D2487-17e1 Classification of Soils for Engineering Purposes (Unified Soil Classification System)

3. ASTM D5080-20 Rapid Determination of Percent Compaction

Revised - 31 23 22 - 4

C. Bureau of Reclamation (Reclamation)

1. RSHS Reclamation Safety and Health Standards including revisions, available at https://www.usbr.gov/safety/rshs/index.html

2. Pipe Bedding and Backfill Geotechnical Training Manual No. 7, 1996, available at https://www.usbr.gov/tsc/techreferences/ma nds/manuals.html

D. Colorado Department of Transportation (CDOT)

1. CDOT Specifications-2024 Standard Specifications for Road and Bridge Construction, available at https://www.codot.gov/business/designsupp ort/cdot-construction-specifications

E. Burlington Northern Santa Fe (BNSF)

1. BNSF-2025 Utility Accommodation Policy, available at https://www.bnsf.com/bnsf-resources/pdf/about-bnsf/utility.pdf

1.04 SUBMITTALS

A. In accordance with Section 01 33 00 - Submittals.

B. RSN 31 23 22-1, Excavation Work Plan:

1. In accordance with RSHS.

2. Work plan details required by the RSHS and design documentation for trench and shielding aspects that require a registered professional engineer.

C. RSN 31 23 22-2, Processing Plan:

1. Describe equipment and methods for removing, stockpiling, processing, crushing, screening, moistening, moisture removal, placing, and compacting pipe embedment and backfill to achieve requirements in article 2.03 Special Encasement and in article 3.06 Stockpiling.

2. Schedule and sequence.

3. Working and stockpiling areas and haul route plans.

1.05 PROJECT CONDITIONS

A. Soil conditions are described in Section 53 10 00 – Geologic Investigations.

B. Excavate and process in-situ soils and bedrock according to pipe trench embedment and backfill requirements.

Revised - 31 23 22 - 5

C. Bidders shall formulate conclusions related to excavation characteristics of in-situ site materials based on drawings and geologic investigations.

PART 2 PRODUCTS

2.01 BEDDING

A. CLSM in accordance with Section 31 23 70 – Controlled Low Strength Material when required in the typical trench dimensions table in drawings.

B. CLSM or select fill material when required in the typical trench dimensions table in drawings.

C. See 2.03 Special Encasement for bedding and embedment between as shown in drawings.

D. CLSM is required when pipe segments are located under CDOT roadway and as shown in drawings.

2.02 EMBEDMENT

A. Same material criteria as article 2.01 Bedding.

2.03 SPECIAL ENCASEMENT

A. Special encasement in accordance with this section as shown in drawings. This includes the CLSM plus clay plug option and the CLSM only option under the valves only which only applies to special encasement as shown on drawings.

B. Applies to clay plug locations within the Town of Boone.

C. Material for the special encasement should consist of a minimum fines content of 50 percent and plasticity index minimum of 15. Compaction in accordance with Section 31 23 02 – Compacting Earth Materials.

2.04 MATERIALS FOR BACKFILL

A. Obtain pipe embedment and backfill material from required excavations. If sufficient suitable material is not available from this source, obtain additional material from other sources accepted by COR:

1. Government makes no guarantee that specified pipe embedment and backfill materials are contained in or can be processed from materials excavated.

2. Reasonable effort shall be expended to obtain suitable pipe embedment and backfill materials from required excavation prior to obtaining imported backfill from commercial sources.

Revised - 31 23 22 - 6

B. Do not use:

1. Unprocessed expansive clays, shales, or claystone in compacted backfill or embedment.

2. Material removed during stripping for pipe embedment and backfill materials.

3. Organic material or other deleterious material.

C. Type and amount of material used for pipe embedment and backfill, and manner of placing material, shall be subject to acceptance by COR.

D. Provide processing equipment and perform work necessary to process excavated materials to produce materials meeting the requirements of these specifications.

E. Material shall be thoroughly mixed and evenly moistened to achieve a uniform material and to avoid pockets or lenses of variable material.

F. Material gradation and plasticity index (PI):

1. Embedment: As shown on Drawing 382-D-60617.

2. Backfill:

a. Fines content required: Greater than 15 percent fines and where special encasement is required in accordance with Drawing 382-D-60661.

b. Remainder of backfill greater than 1 foot beyond pipe (as shown on drawings): Maximum particle size: 3 inches or 1/2 lift height, whichever is smaller.

c. Maximum backfill particle size within 1 foot of the outside of pipe:

Conform to requirement of Table 31 23 22A - Maximum Backfill Particle Size within 1 Foot of Pipe:

Table 31 23 22A - Maximum Backfill Particle Size within 1 Foot of Pipe

Type of Pipe Maximum Particle Size, inches PVC, metallic pipe with dielectric coating, or metallic pipe encased in polyethylene

3/4

Polyethylene Pipe:

Diameter 10- to 16-inch Diameter greater than 16-inch

1 1/2 Other pipe types 3

3. Imported Backfill: Meet requirements listed for Backfill.

G. Backfill placed where pipelines cross under open irrigation ditches and other watercourses: Silty or clayey material with a plasticity index of 8 or more.

H. No sharp or angular material shall be utilized within 1 foot of the outside of pipe, for backfill, embedment, or bedding.

Revised - 31 23 22 - 7

I. Where compaction or special compaction is required in accordance with Section 31 23 02

– Compacting Earth Materials, the gradation requirements are the same.

J. Warning tape in accordance with Section 33 11 10 - Pipeline General Requirements.

K. Place CLSM 1 foot above top of pipe when located under CDOT roadway unless casing pipe is used. If casing pipe is used, place CLSM as required for bedding and embedment.

L. A minimum of 12 inches, or match existing thickness of road base, whichever is greater, of Class 6 aggregate base course shall be used for backfill when located under CDOT roadway, see CDOT Specifications Section 304.

PART 3 EXECUTION

3.01 GENERAL

A. Perform operations so that land can be restored to original conditions.

B. Deleted.

C. Placement and compaction operations shall progress and not fall behind pipelaying and excavation operations, allowing for CLSM to obtain required strength shown on Drawing 382-D-60617. If placement and compaction of compacted backfill fall behind pipelaying operations, due to lack of progress or equipment breakdowns, stop excavation and pipelaying operations until sufficient progress has been made as determined by COR.

D. Install warning tape over center of pipe, at least 18 inches below ground, and at least 18 inches above pipe in accordance with Section 33 11 10 - Pipeline General Requirements.

E. Prepare surface so that first compacted lift shall be placed on firm, stable base. Compact surface to specified compaction.

F. Should Optional Price Schedule B be executed, all work in BNSF right-of-way shall comply with the BNSF Utility Accommodation Policy.

3.02 SHORING SYSTEM

A. In accordance with RSN 31 23 22-1, Excavation Work Plan.

B. On-site prior to excavation.

C. Use of trench box at Contractor’s discretion.

D. Minimize ground disturbing activities to minimum required to install pipeline and to provide access in area with trench box. No supplemental excavations shall be performed outside the vertical, shored trench excavation.

Revised - 31 23 22 - 8

3.03 EXCAVATION

A. Do not excavate or keep pipe trench open more than 200 feet ahead of pipelaying operations or as approved by CO:

1. Backfill and Compacting Operations:

a. Shall not fall behind pipelaying and excavation operations.

b. Allow CLSM to obtain required strength in accordance with Section 31 23 70 – Controlled Low Strength Material.

c. At the end of each shift:

1) Restore roadways and clear zone in conformance with approved traffic control plan in accordance with Section 01 55 20 - Traffic Control and CDOT Specifications Section 630 Construction Zone Traffic Control.

2) 200 feet of pipe trench, maximum, is open ahead of pipelaying or as approved by CO.

3) Backfill is within 200 feet of pipelaying or as approved by CO.

4) For trenches left open overnight:

a) Cap exposed end of the pipeline.

b) Fence open trench with temporary safety fence in accordance with Section 01 56 32 – Temporary Safety Fence.

2. If backfilling and compacting fall behind pipelaying operations, stop excavation and pipelaying operations. Do not proceed until determined by COR.

B. Excavate pipe trenches for pipelines, delivery installations, and pipeline accessories to lines and grades shown on drawings.

C. Finish bottom of trench accurately to lines and grades shown on drawings.

D. Perform excavation in the dry.

E. Do not excavate in frozen materials.

F. Preserve material below and beyond established lines of excavation in soundest possible condition:

1. Damage to work due to Contractor’s operations shall be repaired by and at expense of Contractor.

2. Material beyond required or prescribed excavation lines which is loosened by Contractor’s operations shall be removed at expense of Contractor.

G. Deleted.

Revised - 31 23 22 - 9

H. Fence open trench with temporary safety fence in accordance with Section 01 56 32 – Temporary Safety Fence.

3.04 ADDITIONAL EXCAVATION

A. Perform additional excavation in trench bottom for pipe, thrust blocks, and collar foundations as shown on drawings and other additional excavation beyond specified lines as determined by the COR and as approved by CO.

3.05 OVEREXCAVATION

A. When foundation material is over-excavated beyond specified lines and grades shown on the drawings, fill over-excavation with backfill materials and compact in accordance with Section 31 23 02 – Compacting Earth Materials.

B. If foundation material is over-excavated by being disturbed or loosened during excavation, compact material in place or remove and replace with backfill material and compact in accordance with Section 31 23 02 – Compacting Earth Materials.

3.06 STOCKPILING

A. Stockpile excavated materials that meet or shall be processed to meet material requirements for backfill in pipe trenches until processed or used as backfill material.

B. Do not compact stockpile material.

C. Wet material as it is stockpiled to minimum of optimum moisture content.

D. Material that is outside of specified moisture content limits shall be processed to meet moisture requirements. Test moisture content in accordance with Section 31 23 02 – Compacting Earth Materials prior to placement.

3.07 DISPOSAL

A. Dispose of material not used or processed for use as backfill material and waste materials from such processing in accordance with Section 31 23 39 – Disposal of Excavated Materials.

3.08 PIPE TRENCH FOUNDATION

A. Prepare pipe trench foundation by methods to provide firm foundations for pipe:

1. Finish bottom and side slopes of excavation, upon or against which pipe should be placed, to prescribed dimensions.

2. Moisten and compact prepared surfaces with suitable tools to form firm foundations upon or against which to place pipe.

Revised - 31 23 22 - 10

B. Where unsuitable material is encountered in pipe trench foundation, COR shall determine additional excavation required to remove unsuitable material. Replace materials as approved by CO in accordance with Section 31 23 02 – Compacting Earth Materials.

C. Keep exposed excavation surfaces of shale, claystone, and mudstone moist until earth materials are placed on or against it.

3.09 PIPE INSTALLATION

A. In accordance with Section 33 11 10 – Pipeline General Requirements.

3.10 BEDDING AND EMBEDMENT

A. Place to lines and grades shown on drawings.

B. Do not drop directly on pipe.

C. Place CLSM in accordance with Section 31 23 70 – Controlled Low Strength Material and as shown on the drawings.

D. Place to widths and depths shown on drawings.

E. Place at the same elevation on both sides of the pipe to prevent unequal loading and displacement of pipe. Elevation difference on sides of pipe shall not exceed 6 inches.

3.11 BACKFILL PLACEMENT

A. Install warning tape over center of pipe at least 18 inches below ground and at least 18 inches above pipe and conduit.

B. Place backfill in pipe trenches to restore area to existing site conditions.

C. Do not place material in backfill when either the material or the surfaces on which the backfill should be placed are frozen.

D. Place backfill for over-excavation performed outside specified or directed lines and grades for excavation for pipe trenches in the same manner as specified for adjacent backfill or embedment.

E. Do not drop backfill directly on pipe.

F. Place backfill carefully and spread in uniform layers so that backfill is homogeneous and free from lenses, pockets, voids, laminations, or other imperfections.

G. Place backfill in lifts:

1. Backfill to be compacted: In accordance with Section 31 23 02 – Compacting Earth Materials.

2. Maximum lift height of other backfill: 1 foot.

Revised - 31 23 22 - 11

H. Place backfill to the same elevation on both sides of the pipe to prevent unequal loading and displacement of pipe. Elevation difference of backfill on sides of pipe shall not exceed 6 inches.

I. At the end of each shift: Backfill shall be within 200 feet of pipelaying or as approved by the CO.

J. Backfill above compacted backfill may be placed as soon as compacting of backfill is completed:

1. Placing of this backfill shall be delayed at locations determined by COR for the procurement of compacted backfill samples for testing.

2. Place backfill over pipe, as determined by COR, if backfilling operations are interrupted for more than 24 hours.

3.12 COMPACTING BACKFILL

A. Place in layers and compact in accordance with Section 31 23 02 – Compacting Earth Materials.

B. Compact embedment in pipe trenches in layers having about same top elevation on both sides of pipe to prevent unequal loading and displacement of pipe.

C. Compact backfill as specified in Section 31 23 02 – Compacting Earth Materials.

Compacted embedment and backfill layers that do not meet the requirements of these Specifications, based on field quality test results, shall be removed, and replaced at Contractor’s expense.

D. For special compaction, there should be at least 12 inches of cover over pipe before using hand-held impact tampers or walk-behind small tamping equipment. The first 2 feet of compacted backfill material shall be considered special compaction as provided in Section 31 23 02 – Compacting Earth Materials.

E. Locations of backfill to be compacted to minimum 95 percent compaction:

1. As shown on drawings designated as Compacted Backfill.

2. Select material bedding and embedment.

3. On outside of horizontal curves for a minimum of restrained pipe length.

4. Where pipeline cross under roadways and driveways, including the roadway prism (i.e., beneath roadway embankment slopes).

5. Around valve boxes and manholes as shown on drawings.

6. Where additional excavation for pipe trenches is approved by CO.

7. To replace removed foundation material or other material, compact backfill within lines and grades shown on the drawings for this additional excavation.

8. For pipe trenches with side slopes greater than 20 percent.

Revised - 31 23 22 - 12

F. Locations of backfill to be compacted to minimum 90 percent compaction:

1. Backfill to 2 feet above the crown of the pipe (95 percent compaction required in the remainder of backfill).

G. Locations of backfill to be compacted to minimum 85 percent compaction:

1. Pipe backfill not identified in paragraph 3.12 E regarding backfill to minimum 95 percent compaction and paragraph 3.12 F regarding backfill to minimum 90 percent compaction.

H. When tests indicate insufficient density of compacted backfill surrounding pipe:

1. Remove backfill above compacted backfill.

2. Compact backfill until required density is obtained.

3. Replace backfill above compacted backfill.

4. This work shall be at Contractor’s expense.

3.13 PROTECTION

A. Government reserves the right to direct Contractor to place backfill material over compacted backfill within 72 hours after compaction of backfill is completed.

B. Provide at least 12 inches of cover over pipe before using hand-held impact tampers or walk-behind tamping equipment. Compact remaining compacted material in accordance with Special Compaction in Section 31 23 02 – Compacting Earth Materials.

1. After minimum earth cover is in place, the maximum equipment loading allowed over the pipe shall be HS-20 loading (16,000-pound wheel load) in accordance with AASHTO SSHB.

2. If the use of construction equipment that exerts larger wheel load is proposed, submit analysis and determination of required backfill depths or other protective measures to COR.

3. Construction equipment speed when traveling above pipe shall be limited to 5 mph until at least 3.5 feet of cover is achieved.

Bored Crossings

Revised - 33 05 21 - 1

SECTION 33 05 21

BORED CROSSINGS

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Bored Crossing at Railroad – Line Pipe:

1. Payment: Lump-sum price offered in Optional Price Schedule B. Includes:

a. Casing and Carrier Pipes and installed components including appurtenances such as spacers, runners, over-boring grouting, annular space backfill, and end seals.

b. Associated earthwork including excavation, shoring, unwatering, backfill, compaction, existing surface restoration of the bored entrance and exit pits, and disposal of excess excavated materials or other waste products.

c. Concrete thrust block.

d. Guided bore with pilot bore.

B. Bored Crossing at Railroad – Fiber Optic Line:

1. Payment: Lump-sum price offered in Optional Price Schedule B. Includes:

a. Casing and Carrier Pipes and installed components including appurtenances such as spacers, runners, over-boring grouting, annular space backfill, and end seals.

b. Associated earthwork including excavation, shoring, unwatering, backfill, compaction, existing surface restoration of the bored entrance and exit pits, and disposal of excess excavated materials or other waste products.

c. Concrete thrust block.

C. Cost:

1. Include cost of cathodic protection for bored crossings in price offered in Optional Price Schedule B for Buried Galvanic Cathodic Protection and Corrosion Monitoring System – Optional Price Schedule B.

1.02 DEFINITIONS

A. Annular Space: Void space between outside of Carrier Pipe and inside of the Casing Pipe. Space shall contain the spacers and runners during installation.

B. Bored Crossing: A crossing for pressurized or partially full pipeline(s) and utilities crossing under surface obstructions such as roadways, railroads, or waterways using trenchless boring installation methods such as jack-and-bore, auger boring, guided auger boring, and pilot tube guided boring.

Revised - 33 05 21 - 2

1. Does not apply to non-boring trenchless crossing methods including pipe jacking, pipe ramming, utility moling or piercing, horizontal directional drilling, microtunneling, or bore-and-jack.

C. Carrier Pipe: Smaller diameter pipe usually installed inside Casing Pipe which directly conveys project water.

D. Casing Pipe: Larger diameter pipe installed in bored hole to facilitate Carrier Pipe installation, support the ground for construction, and permit future repair/replacement if necessary. Casing Pipe will not directly convey project water.

E. Line Pipe: Adjacent segments of pipe outside extents of bored crossing as shown on drawings.

F. Over-boring Space: Void space between the excavated hole diameter and the outside of the Casing Pipe created during boring or installation process. This space shall be completely filled with grout following installation of the Casing Pipe.

1.03 REFERENCE STANDARDS

A. American Association of State Highway and Transportation Officials (AASHTO)

1. AASHTO M 133-23 Preservatives and Pressure Treatment Processes for Timber

B. American Railway Engineering and Maintenance-of-Way Association (AREMA)

1. Manual for Railway Engineering-19

C. American Society of Civil Engineers (ASCE)

1. ASCE MoP 133-17 Pilot Tube and Other Guided Boring Methods

D. ASTM International (ASTM)

1. ASTM A572-21e1 High-Strength Low-Allow Columbium- Vanadium Structural Steel

2. ASTM A1097/1097M-22 Steel Casing Pipe, Carbon, Electric-Fusion (Arc)-Welded (NPS 10 and Larger)

3. ASTM C33/C33M-18 Concrete Aggregates

E. Bureau of Reclamation (Reclamation)

1. RSHS Reclamation Safety and Health Standards including revisions, available at https://www.usbr.gov/safety/rshs/index.html

Revised - 33 05 21 - 3

F. Union Pacific Railroad (UPRR)

1. Guidelines for Track & Ground Monitoring, April 2021, available from https://www.up.com/cs/groups/public/@uprr /@realestate/documents/up_pdf_nativedocs/ pdf_up_track_ground_monitor.pdf

1.04 SUBMITTALS

A. In accordance with Section 01 33 00 – Submittals.

B. RSN 33 05 21-1, Key Personnel Resumes:

1. Include a minimum of the engineer of record for the crossing, the crew foreman, the drill fluid engineer/technician, and the drill rig operator.

2. Resumes shall demonstrate at least 3 years of experience or 5 projects of similar size, scope, complexity, and installation methods.

C. RSN 33 05 21-2, Material Certifications:

1. Certification for each material used, signed by the material supplier/producer and Contractor. Signed certification shall confirm that each material complies with the specified requirements and is suitable for the intended use.

2. Drill Fluid and Additives:

a. Details and manufacturer data sheets for the proposed drill fluid mixture.

Include the following minimum details:

1) Percent concentration of each component in the proposed drill fluid mixture.

2) Safety Data Sheet for each additive to be used.

3) Drill Fluid and Additives Control Plan for the procurement, use, handling, and disposal of each material or additive.

4) Statement confirming materials or additive is suitable for the intended use and does not interfere or interact with other planned materials or additives.

5) Statement confirming additives do not adversely impact the natural environment when used as intended.

3. Copies of mill or manufacturing certificates for production materials to be used to ensure materials are new, suitable for intended use, and meet required standards listed in this Section.

D. RSN 33 05 21-3, Copy of Application for Crossing Permits:

1. Prepare and submit permit application for each applicable crossing. Each permit application shall include applicable provisions required in Section 01 55 20 - Traffic Control.

Revised - 33 05 21 - 4

2. Submit signed copies of required permits to the Government.

E. RSN 33 05 21-4, Boring and Placement Plan:

1. Narrative of work detailing steps, materials, equipment, and methods necessary to safely excavate, install, test, and complete bored crossing.

a. Details of equipment, key personnel, and methods used to set and maintain survey control to ensure correct alignment and grade.

b. Methods and equipment used to monitor the surface for settlement or heave, and to avoid adverse impacts to existing infrastructure (e.g., roadways, rails, or facilities).

c. Details of methods to mitigate the risks of over-boring in accordance with AREMA standards.

d. Details of methods of shaft excavation, removal, and backfill.

2. Drawings, figures, or sketches to clearly show limits, extents, sequence, and other details of the work. Include at minimum the following details:

a. Staging and assembly working areas and details of this work.

b. Shaft or pit excavation and support methods and sequence.

c. Shaft or pit bracing, shoring, or sloping designed by a licensed Professional Engineer familiar with similar soil excavation support systems.

1) Include details for the temporary bulkhead design at the excavation face should boring not be completed in a single continuous operation.

2) Railroad borings shall be completed in a single continuous operation.

d. Site preparation activities and work required to prepare for boring.

e. Details of the equipment, key personnel, and methods for removal of groundwater from excavations.

f. Boring excavation size, with over-boring space (radial dimension) identified (if used). Include relevant details and sizes of pilot boring and final excavation extents.

g. Cross-section of permanent crossing, show grouting of over-boring space.

Include location of grout ports, end caps, spacers/runners, and connection details to Carrier or Casing Pipes.

h. Equipment:

1) Manufacturer data, operating and safety manuals, and other relevant details for each piece listed.

2) Specialty training requirements and certificates for operators if required by equipment manufacturer.

Revised - 33 05 21 - 5

i. Entry and exit pit locations, shaft excavation, dewatering, shoring, locations and extents of equipment, materials, and key personnel, and surface support items.

j. Pre-installation, assembly, and installation preparation work.

k. Crossing site completion and restoration steps, including equipment and sequence for shoring removal and shaft or pit backfill.

3. Details of the equipment, key personnel, and methods used to survey and monitor the position of the excavation and ensure line-and-grade control along the bored alignment:

a. Equipment data sheets, figures or sketches of installation locations, applicable safety documentation, and a narrative detailing how survey and position, location, and orientation control will be maintained and monitoring during the work.

4. Calculations:

a. Design calculations shall be presented in a neat, readable format with figures, values, and units included to facilitate ease of verification. Bored crossing calculations, including at a minimum:

1) Wall thickness for Casing Pipe: Calculations shall demonstrate that the pipe material, diameter, and thickness are sufficient to resist all loads and resulting stresses.

2) Required thrust force: Estimated thrust loads for the conditions and installation methods to be used.

3) Borehole stability:

a) Theoretical bore excavation volume calculation. Include bulking factors assumed to calculate bulked volume of soils removed from shaft and boring as a function of theoretical in-situ volume.

b) Theoretical grout volume calculation to fill over-boring space.

4) Settlement: Calculations shall demonstrate settlement at existing points of infrastructure and utilities, including but not limited to railroad tracks and fiber optic line, does not exceed the maximum allowable limit in accordance with UPRR crossing permit.

5) Heave: Calculations shall demonstrate heave at existing points of infrastructure and utilities, including but not limited to railroad tracks and fiber optic line, does not exceed the maximum allowable limit in accordance with UPRR crossing permit.

6) All calculations shall be signed and stamped by a currently licensed professional engineer with a minimum of 5 bored crossing design projects over the last 10 years of similar complexity and methodology.

Revised - 33 05 21 - 6

5. Grouting Plan:

a. Comprehensive listing of materials, methods, equipment, and key personnel required to install grout safely and completely in over-boring space.

b. Clearly identify:

1) Type of grout to be used, grout mix design, admixtures required, anticipated density/viscosity, and other relevant details of grout mix required to complete the work. Clearly identify the anticipated minimum and maximum grouting pressures within the pressure restrictions based on AREMA requirements and these specifications.

2) Installation hardware (e.g., grout ports, lines, couplings, and manifolds) required to complete the work, and ensure over-boring space is completely filled.

3) Potential impacts to installed Casing Pipe (e.g., grouting pressures and displacement of installed pipe), and list steps taken to prevent adverse effects from occurring during grouting operations.

4) Include unique numbering system for grout ports and sequence of grout injection by port number.

F. RSN 33 05 21-5, Monitoring Plan:

1. Details of the equipment, key personnel, and methods used to monitor the position of adjacent infrastructure such as railroad tracks, fiber optic and other utilities, roads, structures, or grades during the work to ensure the heave, settlement, and displacement tolerances are not exceeded.

a. Equipment data sheets, figures or sketches of instrumentation and monitoring installation and monitoring locations that include sensor/target layout on a plan view drawing, monitoring frequency, reporting methods, , applicable safety documentation, and a narrative detailing how monitoring will be performed during and after the shaft excavation and support and boring work.

b. Contingency plan detailing actions to be taken should monitoring identify that track movements or adjacent installations exceed thresholds. The contingency plan shall, at a minimum:

1) Detail how the Contractor will prevent additional loss of soils within the subgrade support section below the tracks.

2) Include stoppage of the bore, pressure grouting voids, modifying installation methods and procedures, bulkheading the face of the bore, abandoning the casing with grout fill, or other protective measures.

Revised - 33 05 21 - 7

3) Include emergency response contact information such as Railpros Construction Observation, Flagging, Manager of Track Maintenance, Yard Master, and other monitoring entity.

2. Narrative of methods for monitoring bore excavation spoil volumes compared to theoretical volumes. Include template for reporting of bore advance length, theoretical in-situ volume, theoretical bulked spoil volume, and actual measured spoil volume removed.

3. Details of equipment, key personnel, and methods for monitoring of grout pressures at the injection point.

a. Include type of pressure gauge, measurement units, and resolution.

b. Include schematic showing relative vertical and horizontal positions of grout plant, pump, lines, and gauge(s) with respect to shaft or pit, Casing Pipe, and grout ports.

c. Include methods for verifying complete filling of over-boring space with grout.

d. Include template for reporting of theoretical over-boring volume and actual grout injection volume by grout port and cumulative.

G. RSN 33 05 21-6, Monitoring Data:

1. Results of bore excavation spoil volume monitoring and comparison to theoretical volume in accordance with approved Monitoring Plan. Data shall be tabulated by spoil volume removed each day or each installed Casing Pipe length, whichever is less.

2. Results of survey monitoring of infrastructure overlying the bore in accordance with approved Monitoring Plan.

3. Results of grout pressure and volume monitoring. Data shall be tabulated by grout port.

4. Submit data weekly or more frequently, except as otherwise specified in this section.

H. RSN 33 05 21-7, Draft Drill Logs:

1. If Contractor pursues additional exploratory drilling, submit:

a. Draft copy of the drill logs after completion of both the pilot hole boring (where applicable) and the primary drilling.

b. Adobe portable document format (PDF) or Microsoft Excel format.

I. RSN 33 05 21-8, Final Drill Logs:

1. If Contractor pursues additional exploratory drilling, submit: Same format as Draft Drill Logs and showing relevant details of drilling to complete the work.

Revised - 33 05 21 - 8

1.05 REGULATORY REQUIREMENTS AND PERMITS

A. Refer to Section 51 00 13 - Union Pacific Railroad Crossing Permits. Contractor shall comply with the requirements of the permit.

B. Obtain outstanding necessary permits at Contractor’s expense from appropriate authorities to install bored crossing.

1. Contractor shall be responsible for required utility owner’s inspection and traffic control fees to construct across non-Government owned lands, including easements, Rights-of-Way (ROW), or facilities. Refer to Section 01 55 00 – Vehicular Access and Parking for requirements.

C. Conform to CDOT, railroad, and local ordinances, rules, and regulations for operations at surface infrastructure crossings.

D. Coordinate inspection and approvals by permit issuers with COR as required to comply with terms of permit(s).

1.06 SITE CONDITIONS

A. Refer to Section 53 10 00 – Geologic Investigations for available information.

PART 2 PRODUCTS

2.01 CASING PIPE

A. Smooth Steel Pipe:

1. Material: Comply with ASTM A1097.

a. Pipe ends:

1) Flush, straight, and even in accordance with ASTM A1097.

2) Suitable for use in bored or jacked installation method.

b. Hydrostatic test not required.

c. Diameter:

Table 33 05 21A – Casing Pipe Diameter Nominal Pipe Diameter, in. Minimum Casing Size (Inside

Diameter), in.

4 8 30 44 36 48

d. Thickness: Minimum 0.25 inches as specified in approved plans without excess deformation. Suitable to the acceptance of spacers and runners used in support and installation of the Carrier Pipe without binding and ceasing.

Revised - 33 05 21 - 9

2. Pipe: Straight-seam, longitudinally welded steel. Rotate each adjacent pipe segment at least 90 degrees to avoid a continuous welded seam following installation. Spiral-welded steel pipe shall not be used for jacked installations.

a. Railroad crossings shall comply with AREMA Manual for Railway Engineering Volume 1 Chapter 5.

b. Pipe ends may use either interlocking or welded (half-lap or full penetration butt welds) joints, provided:

1) Flush, straight and even in accordance with ASTM A1097.

2) Utilize one weld method, unless otherwise approved by the COR.

3) Interlocking joint systems with supplemental fillet welds may be required, at the discretion of the COR, if joint movement or loss of engagement occurs during installation. If required, place stitch welds inside pipe and extend around entire perimeter or pipe.

4) Designed to safely withstand handling and installation loads (e.g., jacking forces).

3. Material:

e. Comply with ASTM A1097, using ASTM A572 Grade 50 or equal.

f. Minimum yield strength: 50,000 psi.

4. Lining and Coating: In accordance with Section 09 96 20 – Coatings.

5. Final dimensions subject to approval by Government, and subject to requirements listed above.

2.02 CARRIER PIPE

A. In accordance with Section 33 11 10 – Pipeline General Requirements.

B. Capable of being installed using jacking, pull-in, or combination of the two methods.

2.03 DRILL FLUID AND ADDITIVES CONTROL PLAN

A. Non-toxic, safe for use on public facilities, and suitable for use in typical boring/crossing operations.

B. Drill fluids shall contain minimum 2 percent of high-grade processed bentonite.

Additives to the drill fluid and shall be noted in the approved Drill Fluid and Additives Control Plan:

1. If changes are required by the field Drill Fluid (Mud) Engineer, the additional additives shall be submitted for approval as soon as practical.

2. Do not use unapproved additives or other materials without verbal or written approval from COR.

Revised - 33 05 21 - 10

3. If verbal approval is provided during work, obtain written approval as soon as practicable thereafter but no more than 14 days following verbal approval.

C. Other gel-forming colloidal drilling fluids may be used.

2.04 SPACERS AND RUNNERS

A. Insulated casing spacers and runners shall be installed to facilitate Carrier Pipe installation.

1. Model SSI Stainless Steel Bank Casing Spacers or Model CI Polyethylene Spacers & Insulators, manufactured by Advance Products & Systems, Incorporated, https://apsonline.com; or equal, having the following essential characteristics:

a. Durable and capable of withstanding handling and pipe installation requirements.

b. Materials shall not deteriorate in wet or submerged environments.

c. Spacer and runner materials shall not adversely affect Casing or Carrier Pipe materials, coating, or lining systems.

d. Wet service life of at least 25 years.

B. For carrier pipes with an outside diameter greater than 12 inches, spacers and runners shall maintain a minimum 6-inch clearance between the Carrier and Casing Pipes.

C. Spacing of casing spacers shall be per manufacturer recommendations.

D. No spacers or runners are required for the fiber optic cable.

2.05 END SEALS

A. Model AW “Wrap Around End Seal”, Manufactured by Advance Products & Systems, Incorporated, www.apsonline.com; or equal, having the following essential characteristics:

1. Rubber end seal with stainless steel clamps.

2. Rubber seal manufactured with butyl mastic strips.

2.06 ANNULAR SPACE BACKFILL SAND

A. If required by permits, backfill annular space between Casing Pipe and Carrier Pipe using ASTM C33 sand or other acceptable method as determined by the COR. Ensure the entire annular space is filled leaving no air gaps or voids.

2.07 CONCRETE ANCHOR BLOCK

A. In accordance with Section 03 20 00 – Concrete Reinforcing and Section 03 30 00 – Cast-In-Place Concrete.

Revised - 33 05 21 - 11

2.08 90-DEGREE METAL ELBOW

A. In accordance with Section 33 11 10 – Pipeline General Requirements.

2.09 GROUT

A. In accordance with Section 03 62 20 – Nonshrink Grout for Equipment and Metalwork.

2.10 TEMPORARY WOODEN BULKHEADS

A. Used only as temporary supports to brace excavations, borings, or other earthen faces during work. No wooden components shall remain permanently in the finished work.

B. Dimension Lumber:

1. Species: Redwood.

2. Pressure treated lumber: Per AASHTO M 133.

3. Dimensions: As required to resist loadings, determined by Contractor.

4. Fasteners and anchorages: As required to resist loadings, determined by Contractor.

2.11 SURVEYING, MONITORING, AND MEASUREMENT EQUIPMENT

A. Conduct surveying in accordance with Section 01 71 20 – Surveying.

B. Commercially available surveying, monitoring, and tracking equipment may be used, provided it meets the following maximum tolerances:

1. Capable of measuring and recording horizontal and vertical positions to a maximum 0.01-foot accuracy.

2. Capable of measurement distances to a 0.01-foot accuracy, with a range from

0.00 feet to the maximum distance of the crossing. Tolerances for measurements shall be plus or minus 0.005 feet.

C. The use of multiple concurrent systems (e.g., lasers, radio/radio frequency, magnetic, wireless, inertial guidance systems, and gyroscopes) is permissible, provided they are interoperable and can relay data between systems without loss of accuracy or tolerances.

D. Grout pressure monitoring gauge shall be capable of measuring pressure to a resolution of 0.5 pounds per square inch or less.

E. Spoil volume measurement methods shall be capable of measuring to a resolution of

0.5 cubic yards or less.

F. Grout volume measurement methods shall be capable of measuring to a resolution of 1 cubic foot or less.

Revised - 33 05 21 - 12

G. Systems used shall be capable of calibrating to the established Project benchmarks, survey coordinate systems, datums, and other control points established for the work.

Electronic or hard copy records of the initial setup and calibration check shots shall be made available to the COR upon request.

PART 3 EXECUTION

3.01 GENERAL

A. Verify utility locations prior to excavation in accordance with Section 01 56 15 – Protection of Existing Utilities:

1. Verify and protect existing infrastructure in accordance with Section 01 56 10 – Protection of Existing Installations.

2. Coordinate required temporary protection, relocation, or re-establishment of existing utilities and infrastructure in accordance with the Sections identified above.

B. Remove and replace fencing in accordance with Section 01 56 20 – Existing Fences:

1. Install temporary safety fencing around excavations and borings in accordance with Section 01 56 32 – Temporary Safety Fence.

2. Remove as required to permit access for construction and replace upon completion of the work.

C. Excavate suitable pits or trenches for boring operations:

1. Strip in accordance with Section 31 14 10 – Stripping, Stockpiling, and Placement.

2. Earthwork in accordance with Section 31 23 22 – Pipe Trench Earthwork and approved Boring and Placement Plan.

D. Do not interfere with normal or emergency operations of railroad, highway, street, or other facilities. Coordinate and manage traffic access to the site in accordance with Section 01 55 20 – Traffic Control.

E. Perform work in accordance with approved Plans.

F. Do not weaken or damage railroad, highway, street, or facility. Repair damage at Contractor’s expense.

G. Remove and replace, without additional cost, pipe damaged during boring or installation operations.

Revised - 33 05 21 - 13

H. Install Casing Pipes to lines and grades shown on drawings:

1. Tolerance for final position of Casing Pipe:

a. Not more than 2 percent horizontal or vertical deviation per length (2 feet per 100 feet of Casing Pipe length) total deviation from lines and grades shown on drawings.

b. Not more than 2.5 inches combined horizontal and vertical deflection per 10-foot length of Casing Pipe from lines and grades shown on drawings.

c. Maintain minimum depths per Section 51 00 13 - Union Pacific Railroad Crossing Permits.

I. No pit or trench, excavated to install pipe, shall remain open longer than 7 days after installation unless otherwise determined by COR.

J. Installation operations shall be progressed 24 hours per day through Zone A as defined in UPRR Guidelines for Track & Ground Monitoring or to the extents defined in the drawings, whichever is more stringent.

3.02 ACCESS SHAFTS OR SLOPED EXCAVATIONS

A. Safely excavate and shore and support shafts, pits, or sloped excavations suitable to provide access to the bored crossing(s) at depth for boring operations. Strip topsoil and stockpile in accordance with Section 31 14 10 - Stripping, Stockpiling, and Placement.

B. Where excavations extend below groundwater levels, perform dewatering operations in accordance with Section 31 03 33 – Removal of Water from Excavation:

1. Remove or control nuisance surface water inflows in accordance with the same Section.

2. Conduct work in the dry except for removal of water.

C. No shaft or excavation created for boring operations or installation of the crossing shall remain open longer than 7 days after…