Amendment 2 - Revisions to Specifications (Correct).pdf

Mosquito Creek Stilling Basin Joint Sealing

SECTION TABLE OF CONTENTS

DIVISION 01 - GENERAL REQUIREMENTS

SECTION 01 22 00.00 08

PRICE AND PAYMENT PROCEDURES

PART 1 GENERAL

1.1 SUBMITTALS

1.2 SINGLE JOB PAYMENT ITEMS

1.2.1 Reimbursement For Actual Performance And Payment Bond Premiums

1.2.2 Temporary Erosion and Sediment Controls

1.2.2.1 Payment

1.2.2.2 Unit of Measure

1.2.2.3 Payment Item (s)

1.2.3 Water Diversion

1.2.3.1 Payment

1.2.3.2 Unit of Measure

1.2.3.3 Payment Item (s)

1.2.4 Site Preparation and Restoration

1.2.4.1 Payment

1.2.4.2 Unit of Measure

1.2.4.3 Payment Item (s)

1.2.5 Foam Grout Waterstop

1.2.5.1 Payment

1.2.5.2 Unit of Measure

1.2.5.3 Payment Item (s)

1.2.6 PVC Waterstop

1.2.6.1 Payment

1.2.6.2 Unit of Measure

1.2.6.3 Payment Item (s)

1.2.7 Stormwater Pipe Extension

1.2.7.1 Payment

1.2.7.2 Unit of Measure

1.2.7.3 Payment Item (s)

1.2.8 Construct Access Road

1.2.8.1 Payment

1.2.8.2 Unit of Measure

1.2.8.3 Payment Item (s)

1.3 UNIT PRICE PAYMENT ITEMS

1.3.1 Digital Progress Images

1.3.1.1 Payment

1.3.1.2 Measurement

1.3.1.3 Unit of Measure

1.3.1.4 Payment Items

1.3.2 Remove & Replace Security Fencing

1.3.2.1 Payment

1.3.2.2 Measurement

1.3.2.3 Unit of Measure

1.3.2.4 Payment Item (s)

PART 2 PRODUCTS

SECTION 01 22 00.00 08 Page 1 Certified Final Document - Ammendment 1

PART 3 EXECUTION

3.1 CONTRACT COST BREAKDOWN

-- End of Section Table of Contents --

SECTION 01 22 00.00 08 Page 2

SECTION 01 22 00.00 08

PRICE AND PAYMENT PROCEDURES

PART 1 GENERAL

1.1 SUBMITTALS

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

submittals not having a "G" designation are for i nformation 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-03 Product Data

Weight Certificates

1.2 SINGLE JOB PAYMENT ITEMS

Payment items for the work of this contract for which contract job payments will be made are listed in the SCHEDULE and described below.

All costs for items of work, which are not specifically mentioned to be included in a particular job or unit price payment item, are included in the listed job item most closely associated with the work involved. The job price and payment made for each item listed constitutes full compensation for furnishing all plant, labor, materials, and equipment, and performing any associated Contractor quality control, environmental protection, meeting safety requirements, tests and reports, and for performing all work required for which separate payment is not otherwise provided.

1.2.1 Reimbursement For Actual Performance And Payment Bond Premiums

Payment for reimbursement for actual performance and payment bond premiums will be made as specified in 00 73 00 SUPPLEMENTARY CONDITIONS, clause

PAYMENT FOR PERFORMANCE AND PAYMENT BONDS.

0001 REIMBURSEMENT FOR ACTUAL PERFORMANCE AND PAYMENT BOND PREMIUMS

1.2.2 Temporary Erosion and Sediment Controls

1.2.2.1 Payment

Payment will be made for costs associated with operations necessary for construction of the Temporary Erosion and Sediment Controls.

1.2.2.2 Unit of Measure

Unit of measure: Job.

1.2.2.3 Payment Item (s)

0003 TEMPORARY EROSION AND SEDIMENT CONTROLS

SECTION 01 22 00.00 08 Page 3

1.2.3 Water Diversion

1.2.3.1 Payment

Payment will be made for costs associated with operations necessary for construction of water diversions required to complete construction.

1.2.3.2 Unit of Measure

Unit of measure: Job.

1.2.3.3 Payment Item (s)

0004 WATER DIVERSION

1.2.4 Site Preparation and Restoration

1.2.4.1 Payment

Payment will be made for costs associated with operations necessary for Site preparation and restoration inluding but not limited to excavation, backfill, seed and strawing.

1.2.4.2 Unit of Measure

Unit of measure: Job.

1.2.4.3 Payment Item (s)

0005 SITE RESTORATION

1.2.5 Foam Grout Waterstop

1.2.5.1 Payment

Payment for this item shall constitute full compensation for all labor, equipment, material and supply costs to perform the foam grouting, including 1/2 inch drilling and sealing, and all other costs not included in other price items. These costs will include the cost of all materials as specified in 03 01 32 CONCRETE REHABILITATION FOR CIVIL WORKS. Payment for this item shall also include costs for performing measurements for payment; and all other incidental costs in connection with these aspects of the work under this contract.

1.2.5.2 Unit of Measure

Unit of measure: Job.

1.2.5.3 Payment Item (s)

0006 FOAM GROUT WATERSTOP

1.2.6 PVC Waterstop

1.2.6.1 Payment

Payment will be made for costs associated with PVC Waterstops as specified in Sections 03 01 32 CONCRETE REHABILITATION FOR CIVIL WORKS. Cost will include furnishing, transporting, stockpiling (if applicable), 7 inch

SECTION 01 22 00.00 08 Page 4 drilling, placing, and installing the PVC Waterstop including non-shrink grout as specified.

1.2.6.2 Unit of Measure

Unit of measure: Job.

1.2.6.3 Payment Item (s)

0007 PVC WATERSTOP

1.2.7 Stormwater Pipe Extension

1.2.7.1 Payment

Payment will be made for costs associated with furnishing, transporting, delivering, and placing 15 Inch Extension as specified in 02 11 01 MISCELLANEOUS WORK. No separate payment will be made for accessories;

include payment in the contract unit price for the items of work to which the accessories are incidental.

1.2.7.2 Unit of Measure

Unit of measure: Job.

1.2.7.3 Payment Item (s)

0009 STORMWATER PIPE EXTENSION

1.2.8 Construct Access Road

1.2.8.1 Payment

Payment for this item shall constitute full compensation for all labor, equipment, material and supply costs to place aggregate surfacing as designated by the Contracting Officer or their designated representative.

The payment shall constitute full compensation for all labor, equipment, materials and supplies for furnishing and placing crushed aggregate material, including compaction; shall include and all other incidental costs in connection with these aspects of the work under this contract.

Removal of temporary access road at the end of the job will be included as well. This item shall also include payment for proposed methods of increasing allowable load over the outflow tunnel.

1.2.8.2 Unit of Measure

Unit of measure: Job.

1.2.8.3 Payment Item (s)

0010 CONSTRUCT ACCESS ROAD

1.3 UNIT PRICE PAYMENT ITEMS

Payment items for the work of this contract on which the contract unit price payments will be made are listed in the SCHEDULE and described below. The unit price and payment made for each item listed constitutes full compensation for furnishing all plant, labor, materials, and equipment, and performing any associated Contractor quality control, SECTION 01 22 00.00 08 Page 5 environmental protection, meeting safety requirements, tests and reports, and for performing all work required for each of the unit price items.

1.3.1 Digital Progress Images

1.3.1.1 Payment

Payment shall constitute full compensation for all costs in connection with completing this item of work as specified in Section 01 32 33 DIGITAL

PROGRESS IMAGES.

1.3.1.2 Measurement

Measurement shall be based on monthly sets of progress photographs that are approved and accepted by the Contracting Officer or their designated representative.

1.3.1.3 Unit of Measure

Unit of measure: Sets.

1.3.1.4 Payment Items

0002 DIGITAL PROGRESS IMAGES

1.3.2 Remove & Replace Security Fencing

1.3.2.1 Payment

Payment for this item shall constitute full compensation for all labor, equipment, material and supply costs to remove, fabricate, deliver and install fence on the stilling basin walls as shown on the contract drawings and specified in section 32 31 13 CHAIN LINK FENCES AND GATES, including, all metalwork fabrication, shop assembly, delivery and field erection.

1.3.2.2 Measurement

The unit of measurement for remove and replace security fencing will be based on information gathered from field measurements. Measurements shall be linear feets, based on the limits shown on the drawings, successfully placement and accepted by the Contracting Officer or their designated representative.

1.3.2.3 Unit of Measure

Unit of measure: per liner feet in place.

1.3.2.4 Payment Item (s)

0008 REMOVE & REPLACE SECURITY FENCING

PART 2 PRODUCTS

Not Used

SECTION 01 22 00.00 08 Page 6

PART 3 EXECUTION

3.1 CONTRACT COST BREAKDOWN

The Contractor must furnish within 30 calendar days after the date of Notice to Proceed, and prior to the submission of its first partial payment estimate, a breakdown of its single job pay item or items which will be reviewed by the Contracting Officer or their designated representative as to propriety of distribution of the total cost to the various accounts. The cost of any element in the cost breakdown should be less than $25,000 for progress tracking. Any unbalanced items as between early and late payment items or other discrepancies will be revised by the Contracting Officer or their designated representative to agree with a reasonable cost of the work included in the various items. This contract cost breakdown will then be utilized as the basis for progress payments to the Contractor.

-- End of Section --

SECTION 01 22 00.00 08 Page 7

SECTION TABLE OF CONTENTS

DIVISION 02 - EXISTING CONDITIONS

SECTION 02 11 01

MISCELLANEOUS WORK

PART 1 GENERAL

1.1 SUMMARY OF WORK

1.2 REFERENCES

1.3 SUBMITTALS

1.4 ITEMS TO REMAIN IN PLACE

1.4.1 Existing Construction Limits and Protection

1.5 BURNING

1.6 DELIVERY, STORAGE, AND HANDLING

1.6.1 Delivery and Storage

1.6.2 Handling

1.7 QUALITY ASSURANCE

1.7.1 Dust and Debris Removal

1.8 PROTECTION

1.8.1 Protection of Personnel

1.9 EXISTING CONDITIONS

1.10 AGGREGATES AND SUBBASES

1.10.1 General

1.10.2 Definitions

1.10.2.1 Aggregate Base

1.10.3 Waybills and Delivery Tickets

1.10.4 Stockpiling Material

1.10.5 Field Density

1.11 STORM DRAINAGE UTILITIES

1.11.1 Delivery, Storage and Handling

1.11.1.1 Delivery and Storage

1.11.1.2 Handling

1.12 OUTFLOW TUNNEL CROSSING

PART 2 PRODUCTS

2.1 PIPE EXTENSIONS

2.1.1 Pipe Embedment Area

2.1.2 Corrugated HDPE Pipe Extensions

2.2 SLOPE SEEDING AND STABILIZATION

2.2.1 Permanent Seed

2.3 AGGREGATE BASE / TEMPORARY ACCESS ROAD

2.4 GEOTEXTILE

PART 3 EXECUTION

3.1 PIPE EXTENSION

3.2 SUBGRADE AND BASE COURSE

3.3 TITLE OF MATERIALS

3.4 CLEANUP

3.5 AGGREGATES AND SUBBASES

SECTION 02 11 01 Page 1

3.5.1 General Requirements

3.5.2 Preparation of Underlying Course

3.5.2.1 General Requirements

3.5.3 Grade Control

3.5.4 Base Course and Pipe Embedment Area

3.6 STORM DRAINAGE UTILITIES

3.6.1 Excavation For Pipe Culvert

3.6.1.1 Trenching

3.6.2 Bedding

3.6.3 Placing Pipe

3.6.4 Backfilling

3.6.4.1 Backfilling Pipe in Trenches

3.6.4.2 Backfilling Pipe in Fill Sections

3.6.4.3 Compaction

3.6.4.3.1 General Requirements

3.6.4.3.2 Minimum Density

3.6.4.4 Determination of Density

3.6.4.5 Removal of Unstable Material

3.6.4.6 Backfilling

3.6.4.6.1 Movement of Construction Machinery

-- End of Section Table of Contents --

SECTION 02 11 01 Page 2

SECTION 02 11 01

MISCELLANEOUS WORK

PART 1 GENERAL

1.1 SUMMARY OF WORK

The work identified in this section pertains to the miscellaneous site work at the project related to sealing of stilling basin joints, specifically, the construction of a temporary access road and extension of one storm drain pipe. The requirements in this section only pertain to the specific features of work identified.

1.2 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.

ASTM INTERNATIONAL (ASTM)

ASTM D1556/D1556M (2015) Standard Test Method for Density and Unit Weight of Soil in Place by Sand-Cone Method

ASTM D1557 (2012; E 2015) Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-lbf/ft3) (2700 kN-m/m3)

ASTM D2167 (2015) Density and Unit Weight of Soil in Place by the Rubber Balloon Method

ASTM D6938 (2015) Standard Test Method for In-Place Density and Water Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth)

ASTM F2648/F2648M (2017) Standard Specification for 2 to 60 inch Annular Corrugated Profile Wall Polyethylene (PE) Pipe and Fitting for Land Drainage Applications

OHIO DEPARTMENT OF TRANSPORTATION (ODOT)

ODOT (2019) Construction and Material Specifications

1.3 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

SECTION 02 11 01 Page 3 in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Pipe Extension Plan; G, RO

Outflow Tunnel Crossing; G, DO

SD-03 Product Data

Extension Pipe; G, DO

Aggregate Base; G, RO

Geotextile; G, RO

SD-06 Test Reports

Aggregate Base; G, RO

SD-07 Certificates

Aggregates; G, RO

SD-11 Closeout Submittals

Waybills And Delivery Tickets

1.4 ITEMS TO REMAIN IN PLACE

Take necessary precautions to avoid damage to existing items to remain or that are to be removed and replaced, to be reused, or to remain the property of the Government. Specific care should be taken to ensure that any fencing that is affected by the work is returned to a condition equal to or better than when disturbed. Repair or replace damaged items as approved by the Contracting Officer or their designated representative.

Coordinate the work of this section with all other work indicated.

Repairs, reinforcement, or structural replacement require approval by the Contracting Officer or their designated representative prior to performing such work.

1.4.1 Existing Construction Limits and Protection

Do not disturb existing construction beyond the extent indicated or necessary for installation of new construction. Provide protective measures to control accumulation and migration of dust and dirt in all work areas. Remove dust, dirt, and debris from work areas daily.

1.5 BURNING

The use of burning at the project site for the disposal of refuse and debris will not be permitted.

1.6 DELIVERY, STORAGE, AND HANDLING

1.6.1 Delivery and Storage

Materials delivered to site shall be inspected for damage, unloaded, and

SECTION 02 11 01 Page 4 stored with a minimum of handling. Materials shall not be stored directly on the ground. The inside of pipes and fittings shall be kept free of dirt and debris. Before, during, and after installation, plastic pipe and fittings shall be protected from any environment that would result in damage or deterioration to the material. Keep a copy of the manufacturer's instructions available at the construction site at all times and follow these instructions unless directed otherwise by the Contracting Officer or their designated representative. Solvents, solvent compounds, lubricants, elastomeric gaskets, and any similar materials required to install plastic pipe shall be stored in accordance with the manufacturer's recommendations and shall be discarded if the storage period exceeds the recommended shelf life. Solvents in use shall be discarded when the recommended pot life is exceeded.

1.6.2 Handling

Materials shall be handled in a manner that ensures delivery to the trench in sound, undamaged condition. Pipe shall be carried to the trench, not dragged.

1.7 QUALITY ASSURANCE

1.7.1 Dust and Debris Removal

Prevent the spread of dust and debris, and avoid the creation of a nuisance or hazard in the surrounding area. Do not use water if it results in hazardous or objectionable conditions such as, but not limited to, ice, flooding, or pollution.

1.8 PROTECTION

1.8.1 Protection of Personnel

Before, during and after the demolition work continuously evaluate the condition of the structure being demolished and take immediate action to protect all personnel working in and around the project site.

1.9 EXISTING CONDITIONS

Before beginning any demolition or deconstruction work, survey the site and examine the drawings and specifications to determine the extent of the work. Record existing conditions in the presence of the Contracting Officer or their designated representative showing the condition of structures and other facilities adjacent to areas of alteration or removal. Photograph existing conditions in accordance with these Specifications.

Include in the record the description of surface conditions that exist prior to before starting work. It is the Contractor's responsibility to verify and document all required outages which will be required during the course of work, and to note these outages on the record document.

1.10 AGGREGATES AND SUBBASES

1.10.1 General

This section addresses the requirements for furnishing and placing aggregate for use as road base or surface.

SECTION 02 11 01 Page 5

1.10.2 Definitions

1.10.2.1 Aggregate Base

Aggregate base as used herein is well graded, durable aggregate uniformly moistened and mechanically stabilized by compaction.

1.10.3 Waybills and Delivery Tickets

Copies of waybills or delivery tickets shall be submitted during the progress of the work. Before the final payment is allowed, waybills and certified delivery tickets shall be furnished for all aggregates actually used in the construction.

1.10.4 Stockpiling Material

Materials, including approved material available from excavation and grading, shall be stockpiled in the manner and at locations designated.

Before stockpiling of material, storage sites shall be cleared, and sloped to drain. Materials obtained from different sources shall be stockpiled separately.

1.10.5 Field Density

In-place density of the aggregate shall be determined by ASTM D6938, with calibration tests by ASTM D1556/D1556M .

1.11 STORM DRAINAGE UTILITIES

1.11.1 Delivery, Storage and Handling

1.11.1.1 Delivery and Storage

Materials delivered to site shall be inspected for damage, unloaded, and stored with a minimum of handling. Materials shall not be stored directly on the ground. The inside of pipes and fittings shall be kept free of dirt and debris. Before, during, and after installation, plastic pipe and fittings shall be protected from any environment that would result in damage or deterioration to the material. Keep a copy of the manufacturer's instructions available at the construction site at all times and follow these instructions unless directed otherwise by the Contracting Officer or their designated representative. Solvents, solvent compounds, lubricants, elastomeric gaskets, and any similar materials required to install plastic pipe shall be stored in accordance with the manufacturer's recommendations and shall be discarded if the storage period exceeds the recommended shelf life. Solvents in use shall be discarded when the recommended pot life is exceeded.

1.11.1.2 Handling

Materials shall be handled in a manner that ensures delivery to the trench in sound, undamaged condition. Pipe shall be carried to the trench, not dragged.

1.12 OUTFLOW TUNNEL CROSSING

Allowable vehicle load over the outflow tunnel is limited to 5 tons under all circumstances. The Contractor may propose alternate access methods to allow use of equipment beyond this load limit. If alternate methods are

SECTION 02 11 01 Page 6 proposed, the Contractor shall provide shop drawings to depict the proposed method of crossing the outflow tunnel. The submittal shall be signed and stamped by the KTR's licensed Professional Engineer and shall include all assumptions and calculations to ensure that the proposed tunnel crossing will be adequate for the proposed equipment.

PART 2 PRODUCTS

2.1 PIPE EXTENSIONS

Submit a pipe extension plan. The plan shall show all of the pipe to be extended, the couplings, extension materials, pipe sizes, bedding materials, and protection of the existing piping. Show all pipes proposed to be cut to match final grade.

2.1.1 Pipe Embedment Area

Provide AASHTO No 57 in the pipe embedment area as shown on the drawings.

2.1.2 Corrugated HDPE Pipe Extensions

Extension pipe for connection to existing corrugated PE pipe shall be per

ASTM F2648/F2648M .

Connection: Soil tight split or snap coupler.

2.2 SLOPE SEEDING AND STABILIZATION

2.2.1 Permanent Seed

Provide permanent seed mixtures in accordance with Section 32 92 19

SEEDING.

2.3 AGGREGATE BASE / TEMPORARY ACCESS ROAD

Provide No. 57 aggregate per AASHTO M43. Choke No. 57 stone with limestone dust or screenings to ensure a smooth non erodible surface. Compact base course to 95% dry density per ODOT, Item 304. Aggregates shall consist of clean, sound durable particles of crushed limestone. Sandstone, slag or river deposited gravel will not be accepted.

2.4 GEOTEXTILE

Geotextile should comply with ODOT Section 712.09 Type D.

PART 3 EXECUTION

3.1 PIPE EXTENSION

As indicated on the drawings, the Contractor shall extend the existing drainage pipe. The Contractor shall inspect the existing pipe and check for signs of cracking, bending, or corrosion. If the existing pipe is in poor condition as determined by the Contracting Officer or their designated representative, the Contractor shall follow the direction of the Contracting Officer or their designated representative on how to proceed. It may be necessary for the Contractor to cut the existing pipe so that connection may be made on undamaged portions of the pipes. Damage to existing pipe which is due to the fault or negligence of the Contractor shall be repaired by the Contractor at no additional cost to the

SECTION 02 11 01 Page 7

Government.

3.2 SUBGRADE AND BASE COURSE

Subgrade under the new road aggregate shall be tilled to a minimum depth of 4 inches, moistened, and compacted. Compact aggregate base course and compact with at least 3 passes of a vibratory plate compactor.

3.3 TITLE OF MATERIALS

All materials removed shall become the property of the Contractor and shall be removed from unless otherwise indicated on the contract documents or as directed by the Contracting Officer or their designated representative. Title to materials resulting from demolition and deconstruction, and materials and equipment to be removed, is vested in the Contractor upon approval by the Contracting Officer or their designated representative of the Contractor's demolition, deconstruction, and removal procedures, and authorization by the Contracting Officer or their designated representative to begin demolition and deconstruction.

The Government will not be responsible for the condition or loss of, or damage to, such property after contract award.

3.4 CLEANUP

Remove and transport the debris in a manner that prevents spillage on streets or adjacent areas. Apply local regulations regarding hauling and disposal.

3.5 AGGREGATES AND SUBBASES

3.5.1 General Requirements

When the base is constructed in more than one layer, the previously constructed layer shall be cleaned of loose and foreign matter by sweeping with power sweepers or power brooms, except that hand brooms may be used in areas where power cleaning is not practicable. Adequate drainage shall be provided during the entire period of construction to prevent water from collecting or standing on the working area. Line and grade stakes shall be provided as necessary for control. Grade stakes shall be in lines parallel to the centerline of the area under construction and suitably spaced for string lining.

3.5.2 Preparation of Underlying Course

3.5.2.1 General Requirements

Before constructing aggregate base, the previously constructed underlying course shall be cleaned of foreign substances. Surface of underlying course shall meet the specified compaction and surface tolerances. Ruts or soft, yielding spots that may appear in the underlying course, areas having inadequate compaction, and deviations of the surface from requirements specified shall be corrected. For cohesionless underlying materials containing sands, sand-gravels, or any other cohesionless material in harmful quantities, the surface shall be mechanically stabilized with aggregate prior to placement of the aggregate subbase or base. Stabilization may be accomplished by mixing subbase or base material into the underlying course and compacting by approved methods.

Properly compacted material will be considered as part of the underlying course and shall meet all requirements for the underlying course.

SECTION 02 11 01 Page 8

Finished underlying course shall not be disturbed by traffic or other operations and shall be maintained in a satisfactory condition until subbase or base is placed.

3.5.3 Grade Control

Underlying material shall be excavated to sufficient depth for the required thickness so that the finished base with the subsequent surface course will meet the final grade. Finished and completed area shall conform to the lines, grades, cross section, and dimensions indicated.

3.5.4 Base Course and Pipe Embedment Area

The aggregate base course shall be mechanically compacted prior to concrete placement. The compacted thickness of the base shall be within 1/2 inch of the thickness indicated. Where the measured thickness is more than 1/2 inch deficient, such areas shall be corrected by scarifying, adding new material of proper gradation, reblading, and recompacting as directed. Where the measured thickness is more than 1/2 inch thicker than indicated, the base shall be considered as conforming to the specified thickness requirements. Average job thickness shall be the average of all thickness measurements taken for the job, but shall be within 1/4 inch of the thickness indicated.

3.6 STORM DRAINAGE UTILITIES

3.6.1 Excavation For Pipe Culvert

Excavation of trenches, and for appurtenances and backfilling for culverts and storm drains, shall be in accordance with the requirements specified below.

3.6.1.1 Trenching

The width of trenches at any point below the top of the pipe shall be not greater than the outside diameter of the pipe plus 6 inches to permit satisfactory jointing and thorough tamping of the bedding material under and around the pipe. Sheeting and bracing, where required, shall be placed within the trench width as specified, without any overexcavation.

Where trench widths are exceeded, redesign with a resultant increase in cost of stronger pipe or special installation procedures will be necessary. Cost of this redesign and increased cost of pipe or installation shall be borne by the Contractor without additional cost to the Government.

3.6.2 Bedding

The bedding surface for the pipe shall provide a firm foundation of uniform density throughout the entire length of the pipe.

3.6.3 Placing Pipe

Each pipe shall be thoroughly examined before being laid; defective or damaged pipe shall not be used. Plastic pipe shall be protected from exposure to direct sunlight prior to laying, if necessary to maintain adequate pipe stiffness and meet installation deflection requirements.

Pipelines shall be laid to the grades and alignment indicated. Proper facilities shall be provided for lowering sections of pipe into trenches.

Pipe shall not be laid in water, and pipe shall not be laid when trench

SECTION 02 11 01 Page 9 conditions or weather are unsuitable for such work. Diversion of drainage or dewatering of trenches during construction shall be provided as necessary. Deflection of installed flexible pipe shall not exceed the following limits:

TYPE OF PLASTIC MAXIMUM ALLOWABLE DEFLECTION (%)

Pastic 5

Not less than 30 days after the completion of backfilling, the Government may perform a deflection test on the entire length of installed flexible pipe using a mandrel or other suitable device. Installed flexible pipe showing deflections greater than those indicated above shall be retested by a run from the opposite direction. If the retest also fails, the suspect pipe shall be replaced.

3.6.4 Backfilling

3.6.4.1 Backfilling Pipe in Trenches

After the pipe has been properly bedded, selected material from excavation or borrow, at a moisture content that will facilitate compaction, shall be placed along both sides of pipe in layers not exceeding 6 inches in compacted depth. The backfill shall be brought up evenly on both sides of pipe for the full length of pipe. The fill shall be thoroughly compacted under the haunches of the pipe. Each layer shall be thoroughly compacted with mechanical tampers or rammers. This method of filling and compacting shall continue until the fill has reached an elevation of at least 12 inches above the top of the pipe. The remainder of the trench shall be backfilled and compacted by spreading and rolling or compacted by mechanical rammers or tampers in layers not exceeding eight inches.

Tests for density shall be made as necessary to ensure conformance to the compaction requirements specified below. Where it is necessary, in the opinion of the Contracting Officer or their designated representative, that sheeting or portions of bracing used be left in place, the contract will be adjusted accordingly. Untreated sheeting shall not be left in place beneath structures or pavements.

3.6.4.2 Backfilling Pipe in Fill Sections

For pipe placed in fill sections, backfill material and the placement and compaction procedures shall be as specified below. The fill material shall be uniformly spread in layers longitudinally on both sides of the pipe, not exceeding 6 inches in compacted depth, and shall be compacted by rolling parallel with pipe or by mechanical tamping or ramming. Prior to commencing normal filling operations, the crown width of the fill at a height of 12 inches above the top of the pipe shall extend a distance of not less than twice the outside pipe diameter on each side of the pipe or 12 feet, whichever is less. After the backfill has reached at least 12 inches above the top of the pipe, the remainder of the fill shall be placed and thoroughly compacted in layers not exceeding eight inches.

3.6.4.3 Compaction

3.6.4.3.1 General Requirements

Cohesionless materials include gravels, gravel-sand mixtures, sands, and

SECTION 02 11 01 Page 10 gravelly sands. Cohesive materials include clayey and silty gravels, gravel-silt mixtures, clayey and silty sands, sand-clay mixtures, clays, silts, and very fine sands. When results of compaction tests for moisture-density relations are recorded on graphs, cohesionless soils will show straight lines or reverse-shaped moisture-density curves, and cohesive soils will show normal moisture-density curves.

3.6.4.3.2 Minimum Density

Backfill over and around the pipe and backfill around and adjacent to drainage structures shall be compacted at the approved moisture content to the following applicable minimum density: under nontraffic areas, density shall be not less than that of the surrounding material.

3.6.4.4 Determination of Density

Testing is the responsibility of the Contractor and performed at no additional cost to the Government. Testing shall be performed by an approved commercial testing laboratory or by the Contractor subject to approval. Tests shall be performed in sufficient number to ensure that specified density is being obtained. Laboratory tests for moisture-density relations shall be made in accordance with ASTM D1557 except that mechanical tampers may be used provided the results are correlated with those obtained with the specified hand tamper. Field density tests shall be determined in accordance with ASTM D2167 or ASTM D6938. When ASTM D6938 is used, the calibration curves shall be checked and adjusted, if necessary, using the sand cone method as described in paragraph Calibration of the referenced publications.

ASTM D6938 results in a wet unit weight of soil and ASTM D6938 shall be used to determine the moisture content of the soil. The calibration curves furnished with the moisture gauges shall be checked along with density calibration checks as described in ASTM D6938. Test results shall be furnished the Contracting Officer or their designated representative.

The calibration checks of both the density and moisture gauges shall be made at the beginning of a job on each different type of material encountered and at intervals as directed.

3.6.4.5 Removal of Unstable Material

Where wet or otherwise unstable soil incapable of properly supporting the pipe, as determined by the Contracting Officer or their designated representative, is unexpectedly encountered in the bottom of a trench, such material shall be removed to the depth required and replaced to the proper grade with select granular material, compacted as provided in paragraph BACKFILLING. When removal of unstable material is due to the fault or neglect of the Contractor while performing shoring and sheeting, water removal, or other specified requirements, such removal and replacement shall be performed at no additional cost to the Government.

3.6.4.6 Backfilling

3.6.4.6.1 Movement of Construction Machinery

When compacting by rolling or operating heavy equipment parallel with the pipe, displacement of or injury to the pipe shall be avoided. Movement of construction machinery over a culvert or storm drain at any stage of construction shall be at the Contractor's risk. Any damaged pipe shall be repaired or replaced.

SECTION 02 11 01 Page 11

-- End of Section --

SECTION 02 11 01 Page 12

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W911WN20Q8000

Mosquito Creek Stilling Basin Joint Sealing

01 22 00.00 08 SD-03 Product Data

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01 32 01.00 08 SD-01 Preconstruction Submittals

1.2 G ROProject Scheduler Qualifications

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01 35 00.00 08 G ROIWatch Training

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01 35 26.00 08 SD-01 Preconstruction Submittals

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01 45 00 G RECQC Personnel

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Mosquito Creek Stilling Basin Joint Sealing

01 57 19.00 08 1.5.2 G RORegulatory Notifications

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01 57 23.00 10 SD-06 Test Reports

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1.4.2.3 G ROTemporary Seed and Mulch

01 78 02.00 15 SD-02 Shop Drawings

1.2.1 G DOAs-Built Drawings

02 11 01 SD-02 Shop Drawings

2.1 G ROPipe Extension Plan

1.12 G DOOutflow Tunnel Crossing

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2.1.2 G DOExtension Pipe

2.3 G ROAggregate Base

2.4 G ROGeotextile

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2.3 G ROAggregate Base

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1.10 G ROAggregates

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Mosquito Creek Stilling Basin Joint Sealing

03 01 32 1.4.2 G DOWork Plan

1.5.2 G RODemolition Plan

1.5.2 G ROWater Control Plan

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2.2.2 GTemporary Platform

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2.2.4 G ROGrout Mixers

3.3.1.1 G ROCore Drilling

2.1.5Polyvinyl Chloride (Pvc)

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Mosquito Creek Stilling Basin Joint Sealing

03 01 32 2.1.3 G DOWater Activated Polyurethane

Water Stop Seal Injection Foam

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32 31 13 SD-02 Shop Drawings

1.3 G ROFence Assembly

3.17.1 G ROLocation of Gate, Corner, End, and Pull Posts

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2.2 G ROZinc Coating

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32 92 19 SD-03 Product Data

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