A04_SOW-SPECS.pdf

Technical Specifications for Pavement Restoration DeSoto National Wildlife Refuge Missouri valley, Iowa

United States Department of the Interior Fish and Wildlife Service

Final February 2022

Page J - 1

PART III, SECTION J

LIST OF DOCUMENTS, EXHIBITS, AND OTHER ATTACHMENTS

INDEX

TECHNICAL PROVISIONS/SPECIFICATIONS

DIVISION 1 - GENERAL REQUIREMENTS

SECTION 00320 GEOTECHNICAL DATA

SECTION 01100 SUMMARY OF THE WORK

SECTION 01310 PROJECT COORDINATION

SECTION 01330 SUBMITTALS

SECTION 01420 DEFINITIONS AND STANDARDS

SECTION 01770 PROJECT CLOSEOUT

DIVISION 2 – SITE CONSTRUCTION

SECTION 02228 REMOVING PAVEMENT

SECTION 02230 SITE CLEARING

SECTION 02300 EARTHWORK

SECTION 02310 SITE GRADING

SECTION 02345 GEOTEXTILE INSTALLATION

SECTION 02630 STORM SEWER SYSTEM

SECTION 02722 MODIFIED SUBBASE

SECTION 02735 AGGREGATE SHOULDERING

SECTION 02742 HOT MIX ASPHALT

SECTION 02765 PAVEMENT MARKING

SECTION 02920 SEED

DIVISIONS 3-5 – NOT USED

DIVISIONS 6 – 16 – NOT USED

ATTACHMENTS

1. SUBMITTAL REGISTER

2. TRANSMITTAL OF SHOP DRAWING, EQUIPTMENT DATA, MATERIAL SAMPLES,

OR MANUFACTURER”S CERTIFICATES OF COMPLIANCE

3. REPORT OF SUBSURFACE EXPLORATION AND LABORATORY TESTING

4. PRECONSTRUCTION SAFETY CHECKLIST

Page J - 2

5. DRAWINGS

Drawing Number Sheet Description

3R-IA-519-531 1 of 7 Cover Sheet, Vicinity/Site Maps, Legend and Drawing Index

3R-IA-519-532 2 of 7 Site Plan, General Notes 3R-IA-519-533 3 of 7 Horizontal and Vertical Baseline Control 3R-IA-519-534 4 of 7 Index of Plan Sheets 3R-IA-519-535 5 of 7 Plan Area 1 3R-IA-519-536 6 of 7 Plan Area 2 3R-IA-519-537 7 of 7 Typical Sections

PART 1 - GENERAL

1.1 FOUNDATION BORING NOTES

A. Borings were obtained in July 2002, for design of a previous Road Reconstruction Project. A copy of the boring report is provided in Attachment 3.

B. Figures showing boring locations are included as Attachment 3.

C. Data shown on boring logs is for the Contractor’s information. The Contractor should be cognizant that materials between borings can vary from that shown on logs. Final and complete identification of all materials between borings can be verified only by site excavation. The Contractor shall assume full responsibility for excavating all materials encountered during construction regardless of density or groundwater condition.

D. The boring logs and laboratory test results are an exact copy of the originals made by photo process reproduction. This information was obtained for design purposes and is made available to the Contractor so they may have the same information the designers used. This information is not intended as a substitute for the Contractor’s personal investigations, interpretations or judgment. The Contractor may make his own soils investigation, but he must first obtain approval from the Engineer. Failure of the Contractor to conduct his own investigation or to analyze the available data shall not relieve the Contractor of any responsibility in excavating difficult materials.

E. Water levels indicated on the boring logs is subject to seasonal and/or annual variations. The

Contractor shall install and operate a dewatering system of sufficient capacity to maintain construction area free of water at all times.

F. Soil boring data/analysis provided was performed before flood/washout of areas to be repaired under this Contract. Embankment repair has been performed by the Government since that time.

Therefore, the data/analysis presented in the provided Soils Report may not be representative of the actual current existing conditions in the area that had been washed out and subsequently repaired by the Government.

Division 1 Section 01100 General Requirements Summary of the Work

Summary of the Work

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1.1 PROJECT TITLE:

A. DeSoto National Wildlife Refuge, Road Repair Project.

1.2 WORK UNDER THESE SPECIFICATIONS

A. Measurement and payment of the work of this contract is listed below for each Schedule.

B. Item 1: Road Repair Area 1 –Within this stretch of road there is one area where the pavement was washed away by flooding and the Government has previously performed fill operation to generally return the roadway embankment back to the pre-flood conditions. The contractor shall demolish the pavement (and noted section of curb and gutter), remove approximately 12” of gravel/base material from the road bed, replace with modified subbase material, compact, and repave. The contractor shall also remove all of the gravel and asphalt that has washed into the ditches, re-build the shoulders/embankments, as necessary, place 4” of Type B granular shoulder material on shoulders, install riprap, and provide seed to the Government. Pavement repair areas shall be tapered vertically on each end of the repair for a smooth transition to the existing pavement elevations.

This item will not be measured for separate payment and will be paid for on a lump sum basis.

C. Item 2: Road Repair Area 2 –Within this stretch of road there is one area where the pavement was washed away by flooding and the Government has previously performed fill operation to generally return the roadway embankment back to the pre-flood conditions. The contractor shall demolish the pavement, remove approximately 12” of gravel/base material from the road bed, replace with modified subbase material, compact, and repave. The contractor shall also remove all of the gravel and asphalt that has washed into the ditches, re-build the shoulders/embankments, as necessary, place 4” of Type B granular shoulder material on shoulders, extend culverts as needed to accommodate required work, install culvert end sections, install culvert outlet protection, and provide seed to the Government. Pavement repair areas shall be tapered vertically on each end of the repair for a smooth transition to the existing pavement elevations. This item also includes painting a centerline on the new pavement.

This item will not be measured for separate payment and will be paid for on a lump sum basis.

D. Item 3: Additional Authorized Excavation - This work includes but is not limited to, the removal of all unsuitable soil materials not identified in the drawings in areas and to a depth as recommended by the Contractor’s Independent 3rd Party Geotechnical Engineering Testing Agency and directed by the Government, hauling and disposing of excavated materials, surveying all areas of additional authorized excavation to determine the volume removed, placing & compacting appropriate impervious fill in excavated area, and proof rolling. The Government must authorize any work under this item prior to the work occurring or payment may not be provided for the work.

Summary of the Work

USFWS0203.03 01100 - 2

Measurement for payment for Additional Authorized Excavation will be made by field measurement of the volume in cubic yards of Additional Authorized Excavation acceptably performed. The Contractor shall perform the surveying required for the measurement including line, grade, and calculating total volume of the excavated area. Measurement will be made to the nearest one-tenth of a cubic yard. Measurement must be made prior to backfilling of the excavation and the Government and Contractor must be in agreement on the measured volume prior to backfilling. The Government will not pay for excavation over the unit price quantities provided in the Bid Schedule unless agreed to prior to excavation through the formal modification process administered by the CO.

1.3 LOCATION AND INSPECTION OF SITE

A. The work site is located at the DeSoto National Wildlife Refuge, near Missouri Valley, Iowa.

The mailing address is shown on the Solicitation, Offer, and Award (Standard Forms 1442 or, 18 block 9) as attached to this Invitation. The Refuge Manager, Mr. Tom Cox, may be contacted for further information at the above referenced address or by telephone at (712) 388-4801.

B. All prospective bidders/quoters, contractors, subcontractors, and related persons are encouraged to visit the site(s) of the proposed Work and to assess the location(s) and extent of the Work prior to submitting bids/quotes. Persons may inspect the site by contacting the Refuge Manager.

1.4 SPECIFICATIONS AND DRAWINGS FOR CONSTRUCTION

A. The successful bidder will be provided, upon request, up to 5 sets of additional full size prints of the contract drawings as necessary for execution of this contract. These drawings will be provided at no additional cost to the successful bidder/quoter.

B. Exact location of all affected utilities will be the responsibility of the contractor. Drawings may not completely show all utilities. Site verification is required in addition to contacting any local authorities and utility companies to determine exact locations of utilities.

C. In case of difference between drawings and specifications, the specifications shall govern.

1.5 WORK NOT INCLUDED IN THIS CONTRACT

A. All items indicated "NIC" on drawings or in specifications are items not included in this contract.

B. Work in place is generally shown as "Existing" on the Contract Drawings.

C. Work to be performed under other contracts and not included as part of this contract is generally shown as "By Others" on the Contract Drawings.

1.6 ITEMS PROVIDED BY THE GOVERNMENT

A. Work to be accomplished by the Government or manufactured items to be provided by the Government are generally shown as "By Government" on the Contract Drawings.

Summary of the Work

USFWS0203.03 01100 - 3

1. Unless specifically provided herein, no materials or equipment shall be furnished by the Government under this Contract.

1.7 ENGINEERING SERVICES:

A. The Government had previously established a baseline and some benchmarks for the original paving project. The drawings relate the project to that baseline and those benchmarks. It is not known if those original benchmarks still exist. If so, the Contractor shall furnish and place all stakes, marks, and templates required for the performance and completion of the work, based on those benchmarks. If not, the Contractor shall recreate those benchmarks to the best of his ability. Any existing baseline monuments or benchmarks disturbed or removed during construction shall be reset by the Contractor at their expense.

1.8 TEMPORARY FACILITIES

A. Maintain and restore all government roads, service areas, and utilities used, to pre-construction condition.

B. Temporary toilet facilities shall be provided and maintained throughout project duration.

Temporary toilet facilities shall be removed upon completion of project.

1.9 SITE ACCESS AND RIGHT OF WAY

A. The construction access limits on Government property will be established by the Government and the Contractor shall be responsible for complying with these limits and governing all Work accordingly. The work limits shall be the minimum necessary to complete the work shown. All temporary access roads shall be removed following Work completion unless directed otherwise by the Contracting Officer.

B. Requirements for maintenance of traffic in a safe manner such as signs, barricades, lights, watchmen, etc., shall be met as required. Maintenance of traffic shall be in accordance with the Manual on Uniform Traffic Control Devices (MUTCD.) Contractor shall manage operations to allow traffic and emergency vehicles to traverse roadways at all times. One lane roadways will be allowed in the temporary state to allow for construction operation, but it shall be the contractor’s responsibility to properly manage the flow of traffic through his/her construction site. Load limits and other restrictions shall be obeyed. All bidders are reminded that they are responsible for contacting the local entity such as township, county, state, etc., having jurisdiction in the project vicinity to insure bidders/quoters are aware of any requirements of the local entity. These requirements are between the entity and the bidder. If the Contractor proposes to cross private property, permission must be obtained from the owner to use private property or roads in the conduct of the Work.

C. Work scheduled on Saturdays, Sundays, Federal Holidays or other than normal working hours shall be approved in advance by the Government. Normal working hours shall be considered 7:00 am to 4:30 pm.

Summary of the Work

USFWS0203.03 01100 - 4

D. The Refuge and Visitor Center will remain open to employees and visitors during construction of this project. The Contractor may close only one section of road at a time for work operations.

Before work begins on the next section, the road surface shall be restored to an aggregate surface and be adequate for safe vehicle and pedestrian traffic. The Contractor shall also ensure that the roads are adequate for safe vehicle and pedestrian travel at the end of each week’s operations.

The Contractor shall provide detour signs, warning signs and lights, flagmen, or other traffic control devices, as needed, seven days per week to maintain safe travel.

E. A traffic control plan shall be submitted for approval 14 days prior to mobilization to the site. The plan shall include details of the traffic control devices that will be used to maintain traffic, the plan of how the work will be staged to minimize impacts to travel & to maintain access to facilities and any detour routes.

1.10 SAFETY - IN ADDITION TO FAR 52.236-13 ACCIDENT PREVENTION

A. The Contractor shall designate a safety officer to ensure a safe work site. The safety officer shall perform daily work site inspections to assure compliance with all safety regulations and standards.

B. The Contractor’s Safety Plan shall be available on-site. The Contractor shall provide Material Safety Data Sheets (MSDS) for all hazardous materials brought on-site. MSDS shall be made available in a conspicuous location.

C. All equipment and work activities shall comply with OSHA Regulations and all accidents incidental to work performed under this contract shall be reported in accordance with OSHA reporting requirements. Additionally a copy of the accident report shall be provided to the Contracting Officer.

D. The Contractor shall provide and install barricades, signs, or other warning devices to delineate the construction area and restrict public access to the construction site.

E. Provide at least one non-freezing-type fire extinguisher in each workshop and shed used for storage of materials on the premises. Place in location readily accessible to workers.

F. Provide at least one non-freezing-type fire extinguisher of the appropriate class for each group of workers performing flammable procedures.

G. Provide and maintain a basic first aid kit for use of workers.

1. Provide first aid supply commensurate with size of project with items necessary for first aid treatment of all injuries. Include first aid items identified on MSDS for applicable items, in applicable locations.

2. Advise all workers of the location of first aid supplies.

3. Post telephone numbers of nearest hospital or ambulance service and fire station in conspicuous location. Advise all workers of location of telephone numbers.

H. Provide necessary Personnel Protective Equipment (PPE) as identified by MSDS. Provide documentation, workers have been trained in use of PPE prior to individual use.

Summary of the Work

USFWS0203.03 01100 - 5

I. Prior to, or during the Pre-Construction Conference the contractor shall submit the executed Preconstruction Safety Checklist.

1.11 PROJECT CLEAN UP

A. Contractor shall be responsible for cleaning up and returning to pre-existing conditions all areas disturbed on the Refuge. No dumping shall be permitted anywhere on the Refuge.

1.12 COMPLETION SCHEDULE

A. The Contractor shall complete the project by the date or within the number of days specified on the Solicitation, Offer, and Award, Standard Form 1442.

1.13 SUBMITTALS

A. Submit the name of the designated Safety Officer.

B. Submit Pre-Construction Safety Checklist at Pre-Construction Meeting.

C. Traffic Control Plan

PART 2 - PRODUCTS

(Not Applicable)

PART 3 - EXECUTION

END OF SECTION

Division 1 Section 01310 General Requirements Project Coordination

Project Coordination

USFWS0203.03 01310 - 1

1.1 JOBSITE ADMINISTRATION - Superintendence, Subcontract administration and Quality Control, is the responsibility of the Contractor.

A. Final decisions relative to items in conflict shall be made by the Contracting Officer.

B. The Government shall have the authority to temporarily suspend the Work for such time as necessary because of the failure on the part of the Contractor to perform any of the provisions of the Contract, and no extension of contract performance time will be allowed for such suspensions. Resumption of Work will not be permitted until the Government determines that the deficiencies in performance, which caused the temporary suspension, have been corrected.

C. The Contractor shall notify the Contracting Officer’s Representative (COR) at least ten (10) days prior to the anticipated date of completion of all Work specified herein. Upon completion of the Work, the COR shall proceed with the final inspection which shall be completed as promptly as practicable. The time required for such inspection and for performing any corrective Work shall be included in the contract performance time.

1.2 MODIFICATION/CHANGE ORDER PROCEDURES

A. In the event of the need for a Change Order, the Contractor will receive a letter requesting a price quote for proposed changes to the Contract.

B. For evaluation purposes, the Contractor's quote shall be broken down to show the costs of labor and materials for each proposed category of Work included with the change, along with the total cost for Contractor's overhead, profit, and bond for the proposed changes.

C. All Contract time extensions required as a result of a proposed change must be justified and supported in detail at the time of the proposal.

1.3 PRECONSTRUCTION CONFERENCE

A. Soon after award of the Contract and prior to commencing construction, the Contractor and any subcontractors shall attend a preconstruction conference with representatives of the Government.

Timely notification of the meeting will be given to the Contractor. Time, date, and place of the conference will be determined by the Contracting Officer. Requirements pertaining to Contract administration, construction operations and the project schedule will be discussed.

1.4 PROGRESS MEETINGS

A. Weekly general project meetings will be conducted, if necessary, with a representative of the Contractor at the project site or by telephone by the Government's representative for the purpose of coordinating, expediting, and assessing the work progress.

Division 1 Section 01310 General Requirements Project Coordination

Project Coordination

USFWS0203.03 01310 - 2

B. The Contractor shall provide reports of progress on the project, discuss the work schedule for the coming period and present all conflicts, discrepancies or other difficulties for resolution. A record of discussions and decisions will be prepared by the Contractor and distributed to those attending and others affected.

Division 1 Section 01330 General Requirements Submittals

Submittals

USFWS0203.03 01330 - 1

1.1 GENERAL

A. Refer to submittal register or technical specifications for all submittals required.

B. When specifically requested by the Contracting Officer (CO), Contracting Officer’s

Representative (COR) or the Government’s Construction Inspector, the Contractor shall provide copies of manufacturer's written installation instructions and/or recommendations for review and approval prior to accomplishing equipment installation.

1.2 SUBMITTAL REGISTER:

A. A submittal register is provided in the attachments to this document. The Contractor shall provide all required submittals to the COR within 30 days of award except for items noted otherwise on the submittal register.

B. Provide a copy of Government-furnished submittal form titled “Transmittal of Shop Drawings, Equipment Data, Material Samples, or Manufacturer’s Certificates of Compliance”, which shall be the document for approving or disapproving the information submitted, with all submittals.

The Contractor shall submit five (5) hard copies of data to allow the Government to retain three

(3) hard copies and return two (2) hard copies to the Contractor. If acceptable to the CO and COR, Contractor has option to provide submittals by use of digital means (e.g. email, .pdf, or SharePoint site). Note that digital submittals too large for the Government email system to handle and physical material samples may still need to be submitted by hard copy. Submittals shall be numbered sequentially using the appropriate specification section as a prefix (e.g., 02223.1, 02223.2, etc.). The first re-submittal of a particular submittal shall have a suffix "A" added to that original submittal number, and the second re-submittal of that same submittal shall have a suffix "B" added to the original submittal number, and so on. For example, the first re-submittal of Submittal 02223.1 shall be designated 02223.1A, and the second re-submittal of Submittal 02223.1 shall be designated 02223.1B, and so on.

C. The approval of submittals shall not relieve the Contractor to comply with the terms and conditions of the Contract Drawings and Specifications. The Contractor shall be responsible to determine correct dimension, design, connection, detail and satisfactory construction of all Work.

1.3 PROJECT SCHEDULE:

A. Contractor shall provide as required by Federal Acquisition Regulation (FAR) clauses. *

B. An updated construction schedule shall be submitted with each pay request. Each updated construction schedule shall indicate all Work completed as of the date of the pay request, and any adjustments or revisions to the previously approved schedule.

Division 1 Section 01330 General Requirements Submittals

Submittals

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1.4 PRICE BREAKDOWN - LUMP SUM ITEMS: Contractor shall provide as required by FAR causes. *

1.5 SUBCONTRACTOR'S LIST

A. Submit a list of subcontractors who will be working on the project.

1.6 SUBMITTAL OF PROGRESS PAYMENT CERTIFICATE: Contractor shall provide as required by FAR clauses. *

1.7 GUARANTEES, WARRANTIES AND CERTIFICATES: Refer to Section 01770

1.8 OPERATING AND MAINTENANCE INSTRUCTION: Refer to Section 01770

1.9 DELIVERY TICKETS

A. The Contractor shall submit to the Government's on site representative, one legible copy of each delivery ticket for all material delivered to the construction site.

B. The delivery ticket shall show brand name, catalog number, and number of items received.

1.10 WASTE MANIFESTS

A. The Contractor shall submit copies of all waste manifests.

B. Manifests shall state type of waste (i.e., construction debris, hazardous asbestos, etc.), location of disposal, landfill designation, EPA registration of landfill, and EPA registration for transportation of any hazardous wastes.

* If requested, the applicable FAR clauses will be provided in full text to the resultant contractor at the pre-construction conference.

Division 1 Section 01420 General Requirements Definitions and Standards

Definitions and Standards

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1.1 REGULATORY REQUIREMENTS

A. Regulatory Requirements

1. All Work shall be accomplished in strict accordance with the regulations, codes, and laws in effect at the time the Work is performed for the location where it is to be performed.

B. Final construction shall comply with all OSHA and ABA requirements.

1.2 MEANS AND METHODS

A. Means and methods used in the performance of this Contract must be in accordance with all applicable Federal Acquisition Regulations in addition to OSHA regulations, 29 Code of Federal Regulations, acceptable industry practices as recognized by societies, associations, building codes, manufacturers specifications and any applicable state safety and health requirements.

1.3 PERMITS

A. It is the responsibility of the Contractor to obtain all necessary permits to facilitate the safe and legal accomplishment of all the Work described in this specification. A copy of the permits obtained shall be submitted to the Contracting Officers Representative.

Division 1 Section 01770 General Requirements Project Closeout

Project Closeout

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1.1 MANUFACTURER’S SPECIFICATIONS

A. The installation of manufactured products, together with all associated parts, shall be in conformance with the manufacturer's recommendations, and code requirements. All installations shall be complete and ready for immediate use, and every part required for proper operation of the manufacturer's product shall be provided

1.2 FINAL INSPECTION

A. The Contractor shall request a final inspection in writing at least ten (10) days prior to the anticipated date of completion.

B. Work will not be considered ready for final inspection until all the Work has been completed and the Contractor has certified that all items are properly operating and in strict compliance with all Contract terms and conditions.

C. The Contractor or the project supervisor shall be at the job site during the final inspection.

1.3 TESTS

A. Complete all tests required to prove actual performance of products incorporated into the project.

B. Submit reports of all tests to the Contracting Officer prior to final payment.

1.4 MAINTENANCE INSTRUCTIONS

A. Submit three (3) final copies of all maintenance instructions for all products and systems incorporated into the project. Use simple, non-technical language where possible.

1.5 RECORD DRAWINGS:

A. The Contractor shall provide and maintain in proper order and in good, clean condition, at the Refuge office or at the project site, one (1) complete set of full size prints of all Drawings. On this set, with red pencil or ink, the Contractor will neatly inscribe all changes in Work. At time of final acceptance, and prior to final payment, these corrected prints will be presented to the Contracting Officer’s Representative (COR). The Contractor shall note all data and changes on these record drawings in sufficient detail and clarity to provide information necessary for preparation of "as built" drawings by the Government.

1.6 GUARANTEES, WARRANTIES AND CERTIFICATES

A. The Contractor shall submit all guarantees, warranties and certificates to the Government prior to final payment.

Division 1 Section 01770 General Requirements Project Closeout

Project Closeout

USFWS0203.03 01770 - 2

B. The Government requires a 100% warranty for a period of one full year after final acceptance.

Items of Work found defective during the warranty period shall be replaced at no cost to the Government and the warranty for that particular part of the Work shall automatically extend for one full year beyond the completion date of repairs.

C. If a manufacturer or supplier offers a guarantee in excess of the one year requirement outlined herein, then the longer guarantee period will apply for those particular items.

Division 2 Section 02228 Site Construction Removing Pavement

Removing Pavement and Miscellaneous Structures

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1.1 SUMMARY

A. Section Includes:

1. Surveying road baseline, alignment and elevations as necessary to reconstruct the roadway.

2. Removal and Disposal of:

a. Bituminous Pavements

b. Curb and Gutter

B. Related Sections:

1. Section 02300 - Earthwork

1.2 REFERENCES

A. Iowa DOT Section 2510 – Removal of Pavement

Not Used

3.1 REMOVAL

A. The Contractor shall coordinate with Refuge personnel before removing asphalt and curb and gutter. The Contractor shall restore each section to an aggregate surface that is safe for vehicular and pedestrian traffic before removing the next portion of road.

3.2 PREPARATION

A. Sawing Pavement:

1. Saw bituminous pavement and curb and gutter along removal lines through entire pavement thickness.

2. Produce a neat, square edge prior to restoration.

B. Protect all inplace structures and facilities not designated for removal.

C. The existing pavement shall be surveyed prior to removal of existing pavement as specified in

Section 02742: Hot Mix Asphalt.

3.3 DISPOSAL OF MATERIALS AND DEBRIS

A. Dispose of all asphalt, curb & gutter and other debris at an off-site disposal area in accordance with all applicable laws and ordinances. Follow all Federal, State, County, and local regulations when removing and disposing of waste material, trash, and debris off Government property.

Contractor shall promote sound waste management practices, such as construction and

Division 2 Section 02228 Site Construction Removing Pavement

Removing Pavement and Miscellaneous Structures

USFWS0203.03 02228 - 2

demolition waste recycling, to limit the amount of materials sent to landfills per Executive Order 13101 – Greening the Government through waste prevention, and Federal Acquisition.

B. Burning on-site will not be allowed.

Division 2 Section 02230 Site Construction Site Clearing

Site Clearing

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A. This Section includes the following:

1. Protecting existing trees, shrubs, plants, and grass to remain.

2. Removing existing trees, shrubs, grass.

3. Clearing and grubbing.

4. Stripping and stockpiling topsoil.

5. Temporary erosion and sedimentation control measures.

1.2 MATERIAL OWNERSHIP

A. Except for stripped topsoil or other materials indicated to remain Government property, cleared materials shall become Contractor's property and shall be removed from Project site.

1.3 PROJECT CONDITIONS

A. Traffic: Minimize interference with adjoining roads and other adjacent occupied or used facilities during site-clearing operations.

1. Do not close or obstruct streets, walks, or other adjacent occupied or used facilities without permission from Government and authorities having jurisdiction.

2. Provide alternate routes around closed or obstructed traffic ways.

3. Utility Locator Service: Notify utility locator service for area where Project is located before site clearing.

B. Do not commence site clearing operations until temporary erosion and sedimentation control measures are in place.

PART 2 - PRODUCTS

2.1 SOIL MATERIALS

A. Satisfactory Soil Materials: Requirements for satisfactory soil materials are specified in Section 02300 - Earthwork.

1. Obtain approved borrow soil materials off-site.

Site Clearing

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PART 3 - EXECUTION

3.1 PREPARATION

A. Protect and maintain benchmarks and survey control points from disturbance during construction.

B. Locate and clearly flag trees and vegetation to be removed a minimum of 48 hours in advance of clearing operations, for approval by Refuge Field Personnel.

C. Protect existing site improvements to remain from damage during construction.

1. Restore damaged improvements to their original condition, as acceptable to Contracting Officer.

3.2 TEMPORARY EROSION AND SEDIMENTATION CONTROL

A. Provide temporary erosion and sedimentation control measures to prevent soil erosion and discharge of soil-bearing water runoff or airborne dust to adjacent properties and walkways, according to requirements of authorities having jurisdiction.

B. Inspect, repair, and maintain erosion and sedimentation control measures during construction until permanent vegetation has been established.

C. Remove erosion and sedimentation controls when no longer needed, and restore and stabilize areas disturbed during removal.

3.3 TREE PROTECTION

A. Erect and maintain temporary fencing around tree protection zones before starting site clearing. Remove fence when construction is complete.

B. Do not excavate within tree protection zones, unless otherwise indicated.

C. Repair or replace trees and vegetation indicated to remain that are damaged by construction operations, in a manner approved by COR.

3.4 UTILITIES

A. Contact local utility companies and owners of any utilities located within project areas to obtain locations of all underground utilities before performing any excavation work.

B. Locate, identify, disconnect, remove, cap off and relocate utilities indicated to be removed or modified.

1. Arrange with utility companies and with COR and Refuge Manager to shut off indicated utilities.

Site Clearing

USFWS0203.03 02230 - 3

C. Existing Utilities: Do not interrupt utilities serving facilities occupied by Government or others unless permitted under the following conditions and then only after arranging to provide temporary utility services according to requirements indicated:

1. Notify COR not less than two days in advance of proposed utility interruptions.

2. Do not proceed with utility interruptions without COR's written permission.

3.5 CLEARING AND GRUBBING

A. Clearing

1. Cut and remove all designated trees, shrubs, bushes, windfalls, and other vegetation.

2. Prune and remove any low hanging or unsound branches that will interfere with the work.

B. Grubbing

1. Remove and dispose of stumps and roots remaining from clearing operations including trees indicated to be cleared by others.

C. Fill depressions caused by clearing and grubbing operations with satisfactory soil material unless further excavation or earthwork is indicated.

1. Place fill material as required for the location of the item being cleared or grubbed, in horizontal layers not exceeding a loose depth of 8 inches, and compact each layer to a density equal to adjacent original ground.

3.6 TOPSOIL STRIPPING

A. Remove sod and grass before stripping topsoil.

B. Strip topsoil to whatever depths are encountered in a manner to prevent intermingling with underlying subsoil or other waste materials.

C. Stockpile topsoil materials away from edge of excavations without intermixing with subsoil. Grade and shape stockpiles to drain surface water. Cover to prevent windblown dust.

3.7 DISPOSAL

A. Disposal: Remove surplus soil material, unsuitable topsoil, obstructions, demolished materials, wood and debris from clearing and grubbing operations, and waste materials including trash and debris, and legally dispose of them off Government property at a location selected by the Contractor.

Site Clearing

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1. Separate recyclable materials produced during site clearing from other non-recyclable materials. Store or stockpile without intermixing with other materials and transport them to recycling facilities.

B. Burning on the project site will not be allowed.

Division 2 Section 02300 Site Construction Earthwork

Earthwork

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GENERAL

A. This Section includes the following:

1. Preparing subgrades for pavements.

2. Excavating and backfilling.

1.2 DEFINITIONS

A. Backfill: Soil material used to fill an excavation.

1. Initial Backfill: Backfill placed beside and up to 12-inches over pipe in a trench, including haunches to support sides of pipe.

2. Final Backfill: Backfill placed over initial backfill to fill a trench.

B. Base Course: Course placed between the subbase course and hot-mix asphalt paving.

C. Bedding Course: Course placed over the excavated subgrade in a trench before laying pipe.

D. Borrow Soil: Satisfactory soil imported from off-site, for use as fill or backfill.

E. Excavation: Removal of material encountered above subgrade elevations and to lines and dimensions indicated.

1. Authorized Additional Excavation: Excavation below subgrade elevations or beyond indicated lines and dimensions as recommended by the Contractor’s Independent 3rd Party Geotechnical Testing Agency, and as directed by Government. Authorized additional excavation and replacement material will be paid for according to Contract provisions.

2. Unauthorized Excavation: Excavation below subgrade elevations or beyond indicated lines and dimensions without direction by Government. Unauthorized excavation, as well as remedial work directed by COR, shall be without additional compensation.

F. Fill: Soil materials used to raise existing grades or used to bring excavations up to proposed grades or subgrade.

G. Subbase Course: Course placed between the subgrade and base course for hot-mix asphalt pavement, or course placed between the subgrade and concrete pavement or a concrete sidewalk.

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H. Subgrade: Surface or elevation remaining after completing excavation, or top surface of a fill or backfill immediately below subbase, drainage fill, or topsoil materials.

I. Utilities: On-site underground pipes, conduits, ducts, and cables, as well as underground services within buildings.

1.3 PROJECT CONDITIONS

A. Existing Utilities: Do not interrupt utilities serving facilities occupied by Government or others unless permitted in writing by COR and then only after arranging to provide temporary utility services according to requirements indicated.

1.4 SUBMITTALS

A. Borrow and Aggregate Sources: Provide sources for each material proposed and gradations (ASTM D 422) of proposed materials.

B. Field Quality Control Testing: Submit results of testing weekly to COR upon completion of tests.

1.5 PAYMENT FOR ADDITIONAL MTERIALS

A. The Government will not pay for material (Authorized Additional Excavation, etc.)

placed over the unit price quantities provided in the Bid Schedule unless agreed upon prior to placement of the material through the formal Modification process administered by the Contracting Officer (CO.)

PART 2 - PRODUCTS

2.1 SOIL MATERIALS

A. General: Provide borrow soil materials when sufficient satisfactory soil materials are not available from excavations.

B. Satisfactory Soils: on site soils meeting ASTM D 2487 Soil Classification Groups GW, GP, GM, SW, SP, SM, SC, and CL, or a combination of these groups; free of rock or gravel larger than 3 inches in any dimension, debris, waste, frozen materials, vegetation, and other deleterious matter.

C. Unsatisfactory Soils: Soil Classification Groups ML, OL, CH, MH, OH, and PT according to ASTM D 2487, or a combination of these groups.

1. Unsatisfactory soils also include satisfactory soils not maintained within 4 percent of optimum moisture content at time of compaction.

D. Subbase Material: Naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; ASTM D 2940; with at least 90 percent passing a 1-1/2-inch sieve and not more than 12 percent passing a No. 200 sieve.

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E. Granular Fill: Naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; ASTM D 2940; with at least 90 percent passing a 1-1/2-inch sieve and not more than 12 percent passing a No. 200 sieve.

F. Impervious Fill: Shall consist of cohesive materials having at least 50% passing the U.S. Standard 200 mesh sieve size. Cohesive materials including materials classifying as lean (CL), having a Plasticity Index of 10 or greater, and falling between the “U” line and the “A” line on Figure 3 in ASTM D 2487 – Standard Tests for Classifications of Soils for Engineering Purposes.

G. Bedding Course: Naturally or artificially graded mixture, natural or crushed sand;

ASTM D 2940; except with 100 percent passing a 1-inch sieve and not more than 8 percent passing a No. 200 sieve.

2.2 MISCELLANEOUS MATERIALS

A. Silt Fence: Silt fence shall be in accordance with Iowa DOT Section 4196.

PART 3 - EXECUTION

3.1 GENERAL REQUIREMENTS

A. If present, remove ice and snow prior to grading operations. Provide protective insulating materials to protect foundation soils, subgrades, and subbases against freezing temperatures or frost.

B. All grading shall conform to the planned grades, cross-sections and stakes.

C. Confine operations to established limits.

D. Maintain site in a well drained condition at all times.

1. Install planned drainage facilities concurrent with embankment operations.

2. Provide temporary drainage facilities to maintain existing drainage courses until permanent facilities are operative.

E. Provide silt fence in locations as determined necessary by Contractor or as required by permits obtained by Contractor.

3.2 PREPARATION

A. Protect structures, utilities, pavements, and other facilities from damage caused by settlement, lateral movement, undermining, washout, and other hazards created by earthwork operations.

B. Removal of vegetation, topsoil, debris, obstructions, and deleterious materials from ground surface is specified in Division 2 Section "Site Clearing."

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C. Protect and maintain erosion and sedimentation controls, which are specified in Division 2 Section "Site Clearing," during earthwork operations.

3.3 DEWATERING

A. Prevent surface water and ground water from entering excavations, from ponding on prepared subgrades, and from flooding Project site and surrounding areas.

B. Protect subgrades from softening, undermining, washout, and damage by rain or water accumulation in excavations. Do not excavate trenches as temporary drainage ditches.

C. Install dewatering system to keep subgrades dry and convey ground water away from excavations. Maintain until dewatering is no longer required.

3.4 EXCAVATION

A. Unclassified Excavation: Excavate to subgrade elevations regardless of the character of surface and subsurface conditions encountered. Unclassified excavated materials may include rock, soil materials, and obstructions. No changes in the Contract Sum or the Contract Time will be authorized for rock excavation or removal of obstructions.

1. If excavated materials intended for fill and backfill include unsatisfactory soil materials and rock, replace with satisfactory soil materials.

3.5 EXCAVATION FOR PAVEMENTS

A. Excavate surfaces under pavements to indicated lines, cross sections, elevations, and subgrades.

3.6 EXCAVATION FOR TRENCHES

A. Excavate trenches to indicated grades, lines, depths, and elevations. All excavation shall comply with OSHA 29CFR1926, Subpart P-Excavations.

B. Excavate trenches to uniform widths to provide the following clearance on each side of pipe or conduit. Excavate trench walls vertically from trench bottom to 12 inches higher than top of pipe or conduit, unless otherwise indicated.

C. Trench Bottoms: Excavate and shape trench bottoms to provide uniform bearing and support of pipes and conduit. Shape subgrade to provide continuous support for bells, joints, and barrels of pipes and for joints, fittings, and bodies of conduits. Remove projecting stones and sharp objects along trench subgrade.

1. Excavate trenches 6 inches deeper than elevation required in rock or other unyielding bearing material, 4 inches deeper elsewhere, unless otherwise shown, to allow for bedding course.

D. Provide trench dewatering if groundwater is encountered in pipe zone.

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3.7 SUBGRADE PREPARATION AND INSPECTION

A. Re-excavate, compact and shape the top 6 inches of subgrade area to provide smooth, stable surface for the placement of base course thereon.

B. Compact subgrade material to 100 percent of Standard Proctor Density.

C. Produce and maintain the necessary moisture content in the subgrade material by scarification or application of water.

D. Notify Government when excavation/fill has reached the required subgrade.

E. Proof-roll subgrade with heavy pneumatic-tired equipment to identify soft pockets and areas of excess yielding. Proof-roll shall be performed by the Contractor’s Independent 3rd Party Geotechnical Engineering Testing Agency. Notification when proof-roll will be performed shall be provided to COR 5 (five) calendar days prior to performing proof-roll. Do not proof-roll wet or saturated subgrades.

1. Completely proof-roll subgrade in one direction. Limit vehicle speed to 3 mph (5 km/h).

2. Proof-roll with a loaded 10-wheel, tandem-axle dump truck weighing not less than 15 tons (13.6 tonnes).

3. Excavate soft spots, unsatisfactory soils, and areas of excessive pumping or rutting, as determined by Contractor’s Independent 3rd Party Testing Agency and verified by the Government, and replace with compacted Impervious Fill as directed. Testing Agency shall keep a record of the location and quantity of all Additional Authorized Excavations. If additional Additional Authorized Excavation is required to perform this requirement the Contractor shall provide the Government the following items:

a. Contract’s Testing Agency shall prepare a report identifying the location and quantity of the Additional Authorized Excavation.

b. Refer to Part 1.5 of this specification section for requirement for Payment for Additional Materials.

F. Continue operations until no rutting or displacement occurs under construction traffic.

G. Provide a finished surface within 0.05 feet of the prescribed elevation at all locations

H. Reconstruct subgrades damaged by freezing temperatures, frost, rain, accumulated water, or construction activities, as directed by COR, without additional compensation.

3.8 UNAUTHORIZED EXCAVATION

A. Fill unauthorized excavations as directed by COR.

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3.9 STORAGE OF SOIL MATERIALS

A. Stockpile borrow soil materials and excavated satisfactory soil materials without intermixing. Place, grade, and shape stockpiles to drain surface water. Cover to prevent windblown dust.

1. Stockpile soil materials away from edge of excavations. Do not store within drip line of remaining trees.

3.10 TRENCH BACKFILL

A. Place backfill on subgrades free of mud, frost, snow, or ice.

B. Place and compact bedding course on trench bottoms and where indicated. Compacted impervious fill material, compacted to 95 percent of standard lab density by mechanical means, shall be used in place of the bedding course for the outer 3 ft at each end of the pipe culvert.

Shape bedding course to provide continuous support for bells, joints, and barrels of pipes and for joints, fittings, and bodies of conduits.

C. Place and compact initial backfill consisting of granular fill, free of particles larger than 1 inch in any dimension, to a height of 12 inches over the utility pipe or conduit.

1. Carefully compact initial backfill under pipe haunches and compact evenly up on both sides and along the full length of utility piping or conduit to avoid damage or displacement of piping or conduit. Coordinate backfilling with utilities testing.

2. The outer 3 ft of initial backfill material at each end of the culvert shall be backfilled with impervious fill material. The material shall be placed in lifts not exceeding 8 in. in depth (loose measurement) and compacted to 95 percent of standard lab density by mechanical means.

D. Place and compact final backfill of satisfactory soil to final subgrade elevation. The outer 3 ft at each end of all trenches shall be backfilled with impervious fill material.

The material shall be placed in lifts not exceeding 8 in. in depth (loose measurement) and compacted to 95 percent of standard lab density by mechanical means.

3.11 SOIL FILL

A. Plow, scarify, bench, or break up sloped surfaces steeper than 1 vertical to 4 horizontal so fill material will bond with existing material.

B. Place and compact fill material in layers to required elevations as follows:

1. Under grass and planted areas, use satisfactory soil material.

2. Under pavements, use satisfactory soil material.

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3.12 SOIL MOISTURE CONTROL

A. Uniformly moisten or aerate subgrade and each subsequent fill or backfill soil layer before compaction to within 4 percent of optimum moisture content.

1. Do not place backfill or fill soil material on surfaces that are muddy, frozen, or contain frost or ice.

2. Remove and replace, or scarify and air dry otherwise satisfactory soil material that exceeds optimum moisture content by 4 percent and is too wet to compact to specified dry unit weight.

3.13 COMPACTION

A. Place backfill and fill soil materials in layers not more than 8 inches in loose depth for material compacted by heavy compaction equipment, and not more than 4 inches in loose depth for material compacted by hand-operated tampers.

B. Compact soil materials to not less than the following percentages of maximum dry unit weight according to ASTM D 698 unless otherwise noted:

1. Under pavements, compact each layer of backfill or fill soil material to 100 percent.

2. Under lawn or unpaved areas, scarify and recompact top 6 inches below subgrade and compact each layer of backfill or fill soil material at 90 percent.

3. For utility trenches, compact each layer of initial and final backfill soil material to 90 percent, unless otherwise required in 3.10 where pipes are installed beneath the features listed.

3.14 GRADING

A. General: Uniformly grade areas to a smooth surface, free of irregular surface changes.

Comply with compaction requirements and grade to cross sections, lines, and elevations indicated.

B. Site Grading: Slope grades to prevent ponding. Finish subgrades to required elevations within the following tolerances:

1. Lawn or Unpaved Areas: Plus or minus 1 inch.

2. Pavements: Plus or minus 1/2 inch.

3.15 FIELD QUALITY CONTROL

A. Testing Agency: Contractor shall engage and pay for a qualified Independent 3rd Party Geotechnical Engineering Testing Agency to perform field quality-control testing.

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B. Allow testing agency to inspect and test subgrades and each fill or backfill layer.

Proceed with subsequent earthwork only after test results for previously completed work comply with requirements.

C. Testing agency shall test compaction of soils in place according to ASTM D 1556, ASTM D 2922, as applicable.

D. When subgrades, fills, or backfills have not achieved degree of compaction specified, scarify and moisten or aerate, or remove and replace soil to depth required; recompact and retest until specified compaction is obtained.

E. Perform testing at the following frequency:

1. Compaction testing (ASTM D 698): Perform one test per proposed fill soil and each different type of onsite soil used as fill.

2. In place moisture and density (ASTM D 1556 or ASTM D 2922):

a. Tests for pavement subgrade and embankment fill at discretion of COR.

1) One test (1) per foot of embankment fill placed in each area.

2) Two tests (2) per area of road repair.

3. Gradation Testing (ASTM D 422): One (1) selected by the COR in addition to those required for borrow source approval.

3.16 PROTECTION

A. Protecting Graded Areas: Protect newly graded areas from traffic, freezing, and erosion. Keep free of trash and debris.

B. Repair and reestablish grades to specified tolerances where completed or partially completed surfaces become eroded, rutted, settled, or where they lose compaction due to subsequent construction operations or weather…