1-B08_HEHO_160186_Final_Specifications_10.17.19.pdf

HERBERT HOOVER

NATIONAL HISTORIC SITE

West Branch, Iowa

RESTORE AND STABILIZE HOOVER CREEK

FOR FLOOD MITIGATION

HEHO

PMIS NO. 160186

PROJECT SPECIFICATIONS

(FINAL Construction Documents)

NATIONAL PARK SERVICE

DENVER SERVICE CENTER

August 2019

THIS PAGE INTENTIONALLY LEFT BLANK

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PROJECT SEALS

PROJECT SEALS

I hereby certify that the portion of this technical submission described below was prepared by me or under my direct supervision and that I am a duly registered Professional Engineer under the laws of the State of Iowa.

Brandon W. Luster 8-20-2019

Pages or sheets covered by this seal:

Divisions: 01, 26, 31, 32, 33, 40

Philip E. Rossbach 8-12-2019

Divisions: 03, 04, 06

William E. Davidson 8-12-2019

Divisions: 26

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Table of Contents

TABLE OF CONTENTS

DIVISION 01 — GENERAL REQUIREMENTS

01 11 00 - SUMMARY OF WORK

01 11 00A - ATTACHMENT A FROM FINDING OF NO SIGNIFICANT IMPACT (FONSI)

01 13 00 - PUBLIC IMPACT MITIGATION

01 26 01 - CONTRACT MODIFICATION PROCEDURES

01 27 00 - DEFINITION OF CONTRACT LINE ITEMS

01 31 00 - PROJECT MANAGEMENT AND COORDINATION

01 32 16 - CONSTRUCTION SCHEDULE

01 32 33 - PHOTO DOCUMENTATION

01 33 23 - SUBMITTAL PROCEDURES

01 33 23A - SUBMITTAL LIST

01 35 05 - ENVIRONMENTAL PROTECTION AND SPECIAL CONTROLS

01 35 13.22 - ARCHEOLOGICAL PROTECTION

01 35 23 - SAFETY REQUIREMENTS

01 35 95 - VIBRATION MONITORING TO PROTECT HISTORIC STRUCTURES

01 40 00 - QUALITY REQUIREMENTS

01 40 00A - STATEMENT OF STRUCTURAL TESTS AND SPECIAL INSPECTIONS

01 42 00 - REFERENCE STANDARDS

01 50 00 - TEMPORARY FACILITIES AND CONTROLS

01 57 23 - TEMPORARY STORMWATER POLLUTION PREVENTION

01 67 00 - PRODUCT REQUIREMENTS

01 73 29 - CUTTING AND PATCHING

01 73 40 - EXECUTION

01 74 19 - CONSTRUCTION WASTE MANAGEMENT AND DISPOSAL

01 74 19A - PROJECT WASTE MANAGEMENT PLAN WORKSHEET

01 74 19B - STANDARD SOLID WASTE CONVERSIONS

01 77 00 - CLOSEOUT PROCEDURES

01 77 00A - CLOSEOUT AND O&M REQUIREMENTS

DIVISION 03 — CONCRETE

03 05 05 - CONCRETE TESTING AND INSPECTION

03 11 13 - FORMWORK

03 21 00 - REINFORCEMENT

03 31 30 - CONCRETE, MATERIALS AND PROPORTIONING

03 31 31 - CONCRETE MIXING, PLACING, JOINTING, AND CURING

DIVISION 04 — MASONRY

04 01 20 - MASONRY CLEANING

04 05 50 - COLD AND HOT WEATHER MASONRY CONSTRUCTION

04 42 03 - LIMESTONE

DIVISION 06 — WOOD, PLASTICS, AND COMPOSITES

06 10 00 - ROUGH CARPENTRY

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Table of Contents

DIVISION 26 — ELECTRICAL

26 05 00 - ELECTRICAL - BASIC REQUIREMENTS

26 05 19 - WIRE AND CABLE - 600 VOLT AND BELOW

26 05 26 - GROUNDING AND BONDING

26 05 33 - RACEWAYS AND BOXES

26 05 43 - ELECTRICAL - EXTERIOR UNDERGROUND

26 27 26 - WIRING DEVICES

DIVISION 31 — EARTHWORK

31 10 00 - SITE CLEARING

31 11 60 - WEED ERADICATION

31 11 60A - INTEGRATED PEST MANAGEMENT

31 23 00 - EARTHWORK

31 23 19 - DEWATERING

31 23 33 - TRENCHING, BACKFILLING, AND COMPACTING FOR UTILITIES

31 25 00 - SOIL EROSION AND SEDIMENT CONTROL

31 32 19 - GEOTEXTILES

31 36 00 - GABIONS

31 37 00 - STONE REVETMENT (RIP RAP)

31 63 30 - CONCRETE DRILLED SHAFT

31 66 15 - HELICAL PILE FOUNDATION

DIVISION 32 — EXTERIOR IMPROVEMENTS

32 13 13 - CONCRETE PAVEMENT

32 15 40 - CRUSHED STONE SURFACING

32 91 13 - TOPSOILING AND FINISHED GRADING

32 92 00 - SEEDING, SODDING AND LANDSCAPING

32 92 00A - PRAIRIE BASIN THOMPSON FARM SEED MIXES

DIVISION 33 — UTILITIES

33 05 07 - HORIZONTAL DIRECTIONAL DRILLING

33 05 16 - PRECAST CONCRETE MANHOLE STRUCTURES

33 11 13 - WATER MAIN CONSTRUCTION

33 16 33 - ARTICULATING CONCRETE BLOCK

33 31 11 - GRAVITY SEWER PIPELINE AND MANHOLE CONSTRUCTION

33 40 00 - STORM DRAINAGE SYSTEM

33 46 13 - FOUNDATION AND SUBSURFACE DRAIN SYSTEM

DIVISION 40 — PROCESS INTERCONNECTIONS

40 05 31 - PIPE - PLASTIC

40 05 61 - GATE VALVES

40 05 70 - SLIP-ON FLAT BOTTOM CHECK VALVE

D I V I S I O N 0 1

GENERAL REQUIREMENTS

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091015 SUMMARY OF WORK

SECTION 01 11 00 - SUMMARY OF WORK

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes the following:

1. Work covered by the Contract Documents.

2. Work phases.

3. Work under other contracts.

4. Government Furnished Materials.

5. Contractor use of premises.

6. Public use of site.

7. Occupancy requirements for buildings.

8. Work Restrictions.

9. Special Construction Requirements.

10. Soils Investigation Report.

11. Additional Reports.

1.2 WORK COVERED BY CONTRACT DOCUMENTS

A. Project Location: Herbert Hoover National Historic Site, West Branch, Iowa.

B. The Work consists of the following:

1. The Work includes several improvements associated with an effort to restore and stabilize

Hoover Creek for flood mitigation. The major project elements include channel grading for increased flood convyenance, Downey Street Bridge replacement, and construction of an off-line detention basin. The channel grading and bridge replacement also necessitate the relocation of existing water and sanitary lines, as well as historic wall preservation and reconstruction. The soil excavated for the channel modification and detention basin will be strategically placed along the south and east park perimeter to mitigate sound impacts to park visitors..

2. The Project is designed to comply with a Certification Level according to the U.S. Green

Building Council's Leadership in Energy & Environmental Design (LEED) Rating System, as specified in Division 01 Section "Sustainable Design Requirements."

C. The Project will be constructed under a single prime contract.

1.3 CONTRACTOR USE OF SITE

A. General: Contractor shall have limited use of the National Historic Site for construction operations during the construction period. Refer to the construction limits and staging areas shown on the

Drawings. Contractor's use of the site is also limited by the Government's right to perform work or to retain other contractors on portions of Project.

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B. Storage of Materials: Confine storage of materials to defined staging areas as delineated in the construction drawings.

C. Preservation of Natural Features:

1. Prevent damage to natural surroundings. Restore damaged areas, repairing or replacing damaged trees and plants, at no additional expense to the Government.

2. Provide temporary barriers to protect existing trees and plants and root zones.

3. Do not remove, injure, or destroy trees or other plants without prior approval. Consult with

Contracting Officer and remove agreed-on roots and branches that interfere with construction.

4. Do not fasten ropes, cables, or guys to existing trees.

5. Carefully supervise excavating, grading, filling, and other construction operations near trees to prevent damage.

D. Preservation of Historic Features: Confine all operations to work limits of the project. The structures and landscape involved in the work of this Contract are listed in the National Register of Historic

Places as part of the Herbert Hoover National Historic Site. Every precaution shall be taken by the

Contractor to prevent damage to existing historic structures, buildings, plantings and site features of the surrounding area. Should any damage be incurred as a result of the Contractor's operations at the site, it shall be repaired by the contractor, to the satisfaction of the Contracting Officer at no additional expense to the Government.

1. Should the Contractor's operations uncover or find any historic remains, the Contractor shall suspend operations at the site of discovery, notify the Contracting Officer immediately of the findings; and continue operations in other areas.

E. Driveways and Entrances: Keep driveways, visitor parking areas, boardwalks and entrances serving premises clear and available to Government, Government's employees, and emergency vehicles at all times. Do not use these areas for parking or storage of materials.

1. Schedule deliveries to minimize use of driveways and entrances.

2. Schedule deliveries to minimize space and time requirements for storage of materials and equipment on-site.

F. Construction Camp: Establishment of a camp within the park will not be permitted.

G. Hauling Restrictions: Comply with all legal load restrictions in the hauling of materials. Load restrictions on park roads are identical to the state load restrictions with such additional regulations as may be imposed by the Park Superintendent. Information regarding rules and regulations for vehicular traffic on park roads may be obtained from the Office of the Park Superintendent. A special permit will not relieve Contractor of liability for damage which may result from moving of equipment.

1.4 PUBLIC USE OF SITE

A. Contractor shall at all times conduct his operations to ensure the least inconvenience to the public.

Building, road, and boardwalk closures will be permitted, when required, upon specific approval of

Contracting Officer and for a duration determined based on the features impacted..

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1.5 OCCUPANCY REQUIREMENTS FOR BUILDINGS AND SITE

A. Existing Buildings and Site

1. Partial Government Occupancy: Government will occupy the premises during entire construction period, with the exception of areas under construction. Cooperate with

Government during construction operations to minimize conflicts and facilitate

Government usage. Perform the Work so as not to interfere with Government’s operations.

Maintain existing routes and exits, unless otherwise indicated.

a. Maintain access to existing walkways, corridors, and other adjacent occupied or used facilities. Do not close or obstruct walkways, corridors, or other occupied or used facilities without written permission from the Contracting Officer (CO).

B. New Completed Improvements

1. Government Occupancy of Completed Areas of Construction: Government reserves the right to occupy and to place and install items in completed areas, provided such occupancy does not interfere with completion of the Work. Such placement of items and partial occupancy shall not constitute acceptance of the entire project.

a. Contracting Officer will prepare a Beneficial Occupancy letter for each specific portion of the Work to be occupied before the overall Government occupancy.

b. Obtain a Certificate of Substantial Completion from the NPS before Government occupancy.

c. Before partial Government occupancy systems shall be fully operational, and required tests and inspections shall be successfully completed. On occupancy, Government will operate and maintain systems serving occupied portions of the site.

d. On occupancy, Government will assume responsibility for maintenance and service for occupied portions of the site.

1.6 CONDUCT OF OPERATIONS

A. At all times the contractor shall conduct his operations in conformance with the rules and regulations promulgated by the Secretary of the Interior for the National Park Service, and applicable park rules and regulations prescribed by the Park Superintendent.

B. Work on Saturdays, Sundays, Federal holidays or at night may not be performed without prior consent from the Contracting Officer. Submit requests 7 days in advance of the work to the

Contracting Officer for approval.

C. No signs or advertisements (except those specified herein) shall be displayed on the construction site or within the park unless approved by the Contracting Officer.

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1.7 WORK RESTRICTIONS

A. On-Site Work Hours: Work shall be generally performed during normal business working hours of

7:00 a.m. to 5:00 p.m., Monday through Friday, except when otherwise indicated.

1. Weekend Hours: To Be Determined for each instance, generally 7:00am to 5:00 pm

2. Early Morning Hours: N/A

B. Existing Utilities

1. Existing Utilities: Notify Contracting Officer and utility companies of proposed locations and times for excavation.

2. Contractor shall be responsible for locating and preventing damage to known utilities. If damage occurs, repair utility at no additional expense to the Government.

3. If damage occurs to an unknown utility, repair utility. An equitable adjustment will be made in accordance with the Changes clause of the contract.

C. Existing Utility Interruptions: 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 Contracting Officer not less than seven days in advance of proposed utility interruptions.

2. Do not proceed with utility interruptions without Contracting Officer’s written permission.

3. Hours for Utility Shutdowns: To be determined for each instance, generally not to exceed

4 hours.

D. Nonsmoking Building: Smoking is not permitted within any building or within 25 feet of entrances, operable windows, or outdoor air intakes.

1.8 SPECIAL CONSTRUCTION REQUIREMENTS

A. Project Website: A project website administered by the NPS will be used for purposes of managing communication and documents during the construction stage.

1. See Section 01 31 00 “Project Management and Coordination” for requirements on using the Project Website.

B. Preliminary activities and limited, preparatory construction including mobilization, submittal processing, wet utility construction, and overall surveying and layout may occur prior to September

14, 2020. Major construction of the detention basin, channel, haul roads and berms, and Downey

Street Bridge shall occur between September 14, 2020 and April 5, 2021 to avoid periods of high park visitation with needed street pedestrian connectivity, to avoid the periods when high stream flows are more likely, and to minimize potential impacts in the reconstructed prairie. Limited construction, such as revegetation, may occur after April 5, 2021.

C. All tree removal required by the Project shall occur between October 1 and March 31.

D. The existing Downey Street Bridge is to remain open until September 14, 2020. The proposed

Downey Street Bridge shall be open by April 5, 2021.

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E. Contractor to install the protective retaining wall, and protect in place the historic wall, prior to commencing Downey Street Bridge demolition.

F. Comply with all mitigation measures, applicable to the Construction Contractor, in Attachment A of the Finding of No Significant Impact (FONSI). Attachment A is included at the end of this

Specification for reference.

1.9 SOILS INVESTIGATION REPORT

A. A soils investigation report entitled Geotechnical Engineering Report, December 10, 2018 has been prepared by Terracon..

B. A copy of the report is available to all plan holders with this package.

C. If conflicts occur between the report and drawings or specifications, the drawings and specifications govern.

PART 2 - PRODUCTS (Not Used)

PART 3 - EXECUTION (Not Used)

END OF SECTION 01 11 00

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Restore and Stabilize Hoover Creek for Flood Mitigation

Finding of No Significant Impact (FONSI), Attachment A: Mitigation, Permits and Approvals

RESOURCE PROTECTION MEASURES

The following table outlines resource protection measures (mitigation) and the party responsible for implementing each. The NPS will monitor throughout the construction process to help ensure that resource protective measures are being implemented and are achieving their intended results. The exact mitigation measures will depend on final design and approval of plans by relevant agencies. Proposed action is synonymous with selected action.

Impact Topics and Protection Measures Responsible Party

Cultural Resources

NPS policies and procedures for protecting and preserving cultural resources, including guidance addressing unplanned discoveries of cultural resources, would be followed.

National Park Service and Construction Contractor

The Downey Street Bridge replacement and the Hoover Creek limestone wall reconstruction will follow NPS standards for rehabilitation outlined in The Secretary of the Interior’s Standards for the Treatment of Historic Properties with Guidelines for Preserving, Rehabilitating, Restoring and Reconstructing Historic Buildings.1

National Park Service and Construction Contractor

The proposed action will adhere to guidelines for the management of archeological resources, cultural landscapes, and historic and prehistoric structures found in NPS-28: Cultural Resource Management Guideline.2

National Park Service and Construction Contractor

The National Park Service will follow cultural resource management principles for archeological resources, cultural landscapes, and historic and prehistoric structures as outlined in Management Policies 2006.3

National Park Service and Construction Contractor

The Downey Street Bridge should be documented in accordance with the Historic American Buildings Survey and Historic American Engineering Record programs prior to demolition.

National Park Service and Construction Contractor

Any mitigation proposed by the State Historic Preservation Officer will be implemented. National Park Service and Construction Contractor

The stream channel improvements will incorporate the treatment described in the Herbert Hoover National Historic Site Cultural Landscape Report.4

National Park Service and Construction Contractor

Floodplain and Wetlands

Impact Topics and Protection Measures Responsible Party

Wetlands would be avoided to the extent practicable.

If any wetlands could not be avoided, the National Park Service would follow the procedures outlined in its Procedural Manual 77-1: Wetland Protection.5 Any wetland impacts would be minimized to the extent practicable.

When compliance with Procedure Manual 77-1: Wetland Protection and Section 404 of the Clean Water Act is required, the National Park Service would coordinate with the appropriate United States Army Corps of Engineers office, Iowa Department of Natural Resources, and the National Park Service Water Resources Division. Any required Section 404 permit would be obtained through a joint state and federal permit process that has been established between the Iowa Department of Natural Resources and the United States Army Corps of Engineers.

National Park Service and Construction Contractor

Construction haul roads, staging areas, and site fencing would be located outside of the Hoover Creek riparian corridor.

Construction Contractor

The proposed action must have only negligible to minor, new adverse effects on site hydrology and fluvial processes, including flow, circulation, velocities, hydro-periods, water level fluctuations, sediment transport, channel morphology, and so on. Care must be taken to avoid any rutting caused by vehicles or equipment.5

National Park Service and Construction Contractor

The proposed action must have only negligible to minor, new adverse effects on normal movement, migration, reproduction, or health of aquatic or terrestrial fauna, including at low flow conditions.5

National Park Service and Construction Contractor

The proposed action is conducted so as to avoid degrading water quality to the maximum extent practicable. Measures must be employed to prevent or control spills of fuels, lubricants, or other contaminants from entering the waterway or wetland. The proposed action is consistent with state water quality standards and Clean Water Act Section 401 certification requirements.5

National Park Service and Construction Contractor

Appropriate erosion and siltation controls must be maintained during construction, and all exposed soil or fill material must be permanently stabilized at the earliest practicable date.5

National Park Service and Construction Contractor

Structure or fill must be properly maintained so as to avoid adverse impacts on aquatic environments or public safety.5

National Park Service and Construction Contractor

Heavy equipment use in wetlands must be avoided if at all possible. Heavy equipment used in wetlands must be placed on mats, or other measures must be taken to minimize soil and plant root disturbance and to preserve preconstruction elevations.5

National Park Service and Construction Contractor

Whenever possible, excavated material must be placed on an upland site. However, when this is not feasible, temporary stockpiling of excavated material in wetlands must be placed on filter cloth, mats, or some other semipermeable surface, or comparable measures must be taken to ensure that underlying wetland habitat is protected. Runoff from stockpiled material must be controlled with silt fencing, filter cloth, coir wattles, or other appropriate means to prevent reentry into the waterway or wetland.5

National Park Service and Construction Contractor

Temporary stockpiles in wetlands must be removed in their entirety as soon as practicable.

Wetland areas temporarily disturbed by stockpiling or other activities during construction must be returned to their pre-existing elevations, and soil, hydrology, and native vegetation communities must be restored as soon as practicable.5

National Park Service and Construction

Revegetation of disturbed soil areas should be facilitated by salvaging and storing existing topsoil and reusing it in restoration efforts in accordance with NPS policies and guidance.

Topsoil storage must be for as short a time as possible to prevent loss of seed and root viability, loss of organic matter, and degradation of the soil microbial community.5

National Park Service and Construction Contractor

Where planting or seeding is required, native plant material must be obtained and used in accordance with NPS policies and guidance. Management techniques must be implemented to foster rapid development of target native plant communities and to eliminate invasion by exotic or other undesirable species.5

National Park Service and Construction Contractor

Silt fence provides sediment control by reducing water velocity and ponding water to facilitate the deposition of sediment on the up-gradient side of the fence. Silt fence applications include, but are not limited to, project perimeter control, secondary containment, back of curb protection, and containment for any disturbed or staging area. Silt fence will be inspected regularly for sediment accumulation, tears or holes in the fabric, broken stakes, and gaps in the fabric, or areas where the fabric needs to be re-attached to the wooden stakes.

Construction Contractor

A stabilized staging area is a specific location on or near the project site for stockpiling/staging materials and equipment for use on site. A stabilized staging area allows for a central location for deliveries and storage of equipment when not in use, and reduces disturbance of areas of the site not scheduled for disturbance through construction activities. Stabilized staging areas generally consist of a cleared area of the site with vehicle tracking control and perimeter control (for example, silt fence and/or construction fencing). Stabilized staging areas will be implemented as needed on site. They should be positioned to reduce the need for relocation and should be placed out of areas of active construction activity. Stabilized staging areas will be inspected for adequate vehicle tracking control and perimeter control. Stabilized staging areas should be repaired or modified as needed.

Construction Contractor

Vehicle tracking control will be used at designated points of ingress and egress, where traffic transitions from a stabilized road surface (for example, gravel or pavement) to disturbed soil.

Tracking control is designed to cause soil to vibrate off equipment and vehicles as they transition from disturbed soils to paved areas. In vegetated areas where access is anticipated to be minimal, geotextiles, turf mats, or cattle guards may be installed primarily to protect vegetation and to provide a stabilized entrance.

Construction Contractor

Erosion/sediment control log applications include, but are not limited to, slope stabilization, perimeter control, check dams in swales, back of curb protection, and temporary secondary containment for stockpiles, materials storage, or masonry. Erosion/sediment control logs reduce water velocity, allowing sediment to accumulate on the up-gradient side of the log.

Construction Contractor

Perimeter control serves as erosion and sediment control and, when appropriate, access control. At down-gradient locations, perimeter controls will be installed where overland sheet flow has the potential to leave the site. In up-gradient areas, perimeter control may be added to define project boundaries, limit on-site flows, or protect off-site features. Such controls should be suitable to the application. Perimeter control may consist of any number of best management practices, including, but not limited to, earthen berms, erosion/sediment control logs, silt fence, and construction fencing. Perimeter control will be used around bore holes, trenches, and other locations where sediment is exposed and may accumulate.

Construction Contractor

Inlet protection is designed to slow stormwater flow into the inlet, allowing sediment time to settle and accumulate on the up-gradient side of the structure. Inlet protection will be installed prior to earth disturbing activity up-gradient of the inlet.

Construction Contractor

Erosion control blankets and turf reinforcement mats function by providing ground cover that reduces erosive action. Turf reinforcement mats are able to handle higher levels of concentrated flows and are used mainly in channel applications. Erosion control blankets and turf reinforcement mats may be used in conjunction with other velocity reducing best management practices. Erosion control blanket and turf reinforcement mat applications include, but are not limited to, slope and swale protection.

Seeding involves the mechanical or hand application of specific seed mixes appropriate for the site location and soil type. Seeding provides plant growth to stabilize the soil, reducing the likelihood of erosion or sediment transport. As soon as practical after the completion of construction activities, soil should be properly prepared and seeded.

Construction Contractor

Soils deposited on paved surfaces will be swept or cleaned as needed to reduce the potential of sediment transport and tracking. Sweeping operations consist of scraping large quantities of sediment from pavement and/or sweeping, via hand or mechanical means, to remove as much deposited sediment as possible. All streets within and immediately surrounding a construction site will be cleaned of earth material when sediment has been deposited on the roadway and is being tracked off site. Scraped or swept material will not be deposited in the storm sewer.

Construction Contractor

Surface roughening, which consists of grooves or tracks installed in the soil surface parallel to the slope, is a temporary soil stabilization technique that works well in areas that will remain inactive for a short time. Surface roughening works by reducing water velocity and promoting infiltration, thus decreasing the potential for erosion to occur. Any disturbed areas with no construction activity planned for longer than 14 days may be surface roughened. This may include areas where scheduling prevents the immediate implementation of final stabilization practices, the sides of stockpiles, or other slopes. Surface roughening may be applied by creating a continuous furrow parallel to the slope.

Construction Contractor

Visitor Use and Experience Blank

To minimize safety hazards during construction of the proposed facilities, construction workers would be responsible for following recommended safety procedures. An active construction site would be off limits to park visitors; temporary barriers would be used to prevent visitor access to the site, and signs would be installed along haul routes and access points to warn visitors of construction activities. Construction materials would be located in a secure area.

Construction Contractor

To minimize the impact of noise on visitor experience, the National Park Service would notify site visitors of planned construction and approximate periods. The construction contractor would minimize noise generated by construction equipment by maintaining muffler systems on equipment. Equipment would be operated only as necessary. Construction would be limited to daylight hours.

National Park Service and Construction Contractor

The planned facilities would be constructed in accordance with accessibility standards as outlined in “Director’s Order #42, Accessibility for Visitors with Disabilities in National Park Service Programs and Services,”6 and with the Americans with Disabilities Act, the Architectural Barriers Act Accessibility Standard, and the Uniform Federal Accessibility Standards, as applicable.

National Park Service and Construction Contractor

All construction access, staging, and site fencing would be removed upon completion of construction. Disturbed areas would be returned to pre-existing contours (where applicable) and seeded.

National Park Service and Construction Contractor

Construction would occur from approximately September 2019 to March 2020. Construction work hours would be 7:00 a.m. to 5:00 p.m., with no weekend or holiday work unless previously requested and approved.

Construction Contractor

The construction contractor will develop a traffic control plan. The plan will be provided to the National Park Service for review and approval before implementation. Considerations for emergency vehicle access will be incorporated into the plan.

National Park Service and Construction Contractor

Wildlife Habitat Blank

Areas in the prairie disturbed during construction would be reseeded with a prairie seed mix similar to the existing vegetation of the restored prairie.

Prairie trails in the northwest corner of the prairie would be closed during the construction of the off-channel detention basin. The trails would be rerouted to the north and west of the basin.

National Park Service and Construction Contractor

Construction of the berms would temporarily disrupt the prairie trails located on the south and east boundaries of the prairie. Following construction, it is anticipated that access to the prairie trails would be restored.

National Park Service and Construction Contractor

Tree cutting to avoid impacts on protected species is planned to occur between October 1 and March 31 to meet Migratory Bird Treaty Act and Endangered Species Act tree-cutting restrictions.

Construction Contractor

Tree replacement will occur in number, type, and location consistent with the Herbert Hoover National Historic Site Cultural Landscape Report.4

National Park Service and Construction Contractor

In accordance with the National Park Service’s Management Policies 2006, best management practices would be used for all phases of construction activity, including preconstruction, actual construction, and post-construction.3

National Park Service and Construction Contractor

Construction sites would be limited to the smallest feasible area.

Ground disturbance and site management would be carefully controlled to prevent undue damage to vegetation, soils, and archeological resources, and to minimize air, water, soil, and noise pollution.

Protective fencing and barricades would be provided for safety and to preserve natural and cultural resources.

Effective stormwater management measures specific to the site would be implemented, and appropriate erosion and sedimentation control measures would be in place at all times.

Vegetation would be cleared only as necessary to construct the proposed facilities.

National Park Service and Construction Contractor

Trucks hauling fill and equipment used in the stream channel improvements should have their undercarriages and tires washed before entrance to the site.

Construction Contractor

Travel direction and cleaning locations will be identified prior to the start of work. National Park Service and Construction Contractor

During transport, exposed earthen materials will be covered with fabric or impermeable material to prevent invasive plant contamination.

Construction Contractor

Disturbed soil will be stabilized and covered as soon as possible to prevent germination and growth of invasive plants.

Construction Contractor

Graders and other equipment will be cleaned immediately after operating in areas potentially infested with invasive plants. All dirt and plant parts will be cleaned from the underside of vehicles and other equipment.

Construction Contractor

Vehicles, equipment and tools will be cleaned to remove soil, seeds, and plant parts before transporting materials and before entering and leaving stockpile, staging areas, and work sites.

Construction Contractor

Notes:

1. National Park Service. 2017. The Secretary of the Interior’s Standards for the Treatment of Historic Properties with Guidelines for Preserving, Rehabilitating, Restoring and Reconstructing Historic Buildings. https://www.nps.gov/tps/standards/treatment-guidelines-2017.pdf.

2 National Park Service. 1998. NPS-28: Cultural Resource Management Guideline. June 11. http://obpa-nc.org/DOI- AdminRecord/0049518-0049814.pdf.

https://www.nps.gov/tps/standards/treatment-guidelines-2017.pdf https://www.nps.gov/tps/standards/treatment-guidelines-2017.pdf http://obpa-nc.org/DOI-AdminRecord/0049518-0049814.pdf http://obpa-nc.org/DOI-AdminRecord/0049518-0049814.pdf

3. National Park Service. 2006. Management Policies 2006. ISBN 0-16-076874-8. https://www.nps.gov/policy/MP_2006.pdf.

4 National Park Service. 1995. Herbert Hoover National Historic Site Cultural Landscape Report. National Park Service Midwest

Region. September.

5. National Park Service. 2016. Procedure Manual 77-1: Wetland Protection. June 21.

https://www.nps.gov/policy/DOrders/Procedural_Manual_77-1_6-21-2016.pdf.

6. National Park Service. 2000. “Director’s Order #42: Accessibility for Visitors with Disabilities in National Park Service Programs and Services.” November 3. https://www.nps.gov/policy/DOrders/DOrder42.html.

PERMITS AND APPROVALS

The following is a list of federal, state and local permits that will be required for project construction. This list is not all inclusive and will depend on final design.

USACE and Iowa Department of Natural Resources (Iowa DNR) Joint Application

Section 404 of the Clean Water Act

Section 401 Water Quality Certification

Floodplain Development Permit

Iowa DNR Sovereign Lands Permit

National Pollutant Discharge Elimination System Stormwater Discharge Permit https://www.nps.gov/policy/MP_2006.pdf https://www.nps.gov/policy/DOrders/Procedural_Manual_77-1_6-21-2016.pdf https://www.nps.gov/policy/DOrders/DOrder42.html

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PUBLIC IMPACT MITIGATION

2019/04/12

SECTION 01 13 00 - PUBLIC IMPACT MITIGATION

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Contractual requirements for the protection of the public and the reduction of impacts to the public

B. Related Specification Sections include but are not necessarily limited to:

1. Division 00 - Procurement and Contracting Requirements.

2. Division 01 - General Requirements.

1.2 QUALITY ASSURANCE

A. Referenced Standards:

1. Occupational Safety and Health Administration (OSHA).

2. Governing Noise Control, Emissions Control, Fugitive Dust Control Bylaw, or similar regulation.

1.3 SUBMITTALS

A. Prepare and submit to NPS Contracting Officer (CO) within fourteen (14) days of Notice of

Award, and before the Notice to Proceed is issued, a general public impact mitigation plan for the Work.

B. In addition, prepare and submit to CO at least fourteen (14) days before starting construction in any particular area, a detailed public impact mitigation plan for that specific area. The plan shall include techniques and work procedures that minimize public impact and disruption from the Work.

1. The Contractor’s public impact mitigation plan shall include details on how the work will be implemented and address, as applicable, the following:

a. Access to the Work Site integrated with traffic management plan;

b. Vehicular and pedestrian access to residential, commercial, and industrial properties impacted by the work;

c. Work to be performed outside of normal working hours;

d. Field fabrication (welding and testing), coating and lining facilities;

e. Storage of equipment, materials, soil and gravel;

f. Noise mitigation for equipment and construction processes over 85 dBA;

g. Air quality mitigation (dust control, diesel emissions);

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h. Preservation or interruption of existing utilities;

i. Street cleaning;

j. Site cleanliness and visual impact mitigation; and

k. Restoration.

2. Ensure all of its employees, subcontractors and suppliers strictly comply with the reviewed public impact mitigation plan.

C. Provide CO a minimum of 5 days notice of any significant change in schedule or methodology that could impact the community. This will allow the NPS sufficient time to notify the community of the change.

PART 2 - PRODUCTS - (NOT APPLICABLE TO THIS SPECIFICATION SECTION)

PART 3 - EXECUTION

3.1 GENERAL

A. The Project is located in close proximity to residences/public parks/schools/shopping areas/arterial roads. It is of prime importance that the Contractor implements all practical mitigation measures to reduce impact to the neighborhood during the execution of the Work.

B. Cooperate with the CO, the various utility companies, suppliers, other contractors, property owners and local residents.

C. Ensure that its staff, subcontractors and suppliers behave in a professional manner to other contractors, Park staff and the general public.

3.2 PUBLIC RELATIONS AND COOPERATION

A. The CO has produced the following communications protocol which outlines the project team’s roles and responsibilities. Follow this communications protocol. The CO is the primary communicator with the public and the media. However, the Contractor will have a role with the public on site as defined below. Refer any media requests to the CO.

B. For on site communication with the public, appoint a community liaison person to notify the affected residents and establishments during utility disruption, perceived or actual safety issues, parking and traffic changes, etc. This person shall be a member of the Contractor’s crew who is onsite the majority of the time.

C. The community liaison person shall work independently as necessary on time sensitive issues and with the CO when time permits in such situations. The community liaison person shall promptly address concerns or negative impacts arising from execution of the Work.

D. The Contractor, at the CO’s reasonable request, shall change methods or timing or performing portions of the Work in order to reduce public impacts or address concerns of the public.

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E. Work with the CO to locate noisy, odourous or exhaust producing equipment or activities away from high impact areas.

3.3 PARTNERING

A. Partner with the CO in addressing local residents’ concerns regarding construction work. The

Contractor’s Project Manager or other senior employee and community liaison person shall attend public meetings organized by CO with area residents. It is anticipated that public meetings will occur just prior to construction and on average once per month over the course of construction and will be held outside normal working hours. The CO will attempt to schedule such public meetings to coincide with regular construction progress meetings.

B. Be required to make and keep commitments to local residents regarding aspects of the construction work that impact local residents.

C. Address Public Impact Mitigation as a standing agenda item for regular construction progress meetings.

3.4 ACCESS AND PUBLIC SAFETY

A. Effectively warn and protect the public from any danger or harm related to the implementation of the work. This includes appropriate signage and fencing to restrict public access to the construction site.

B. No material or equipment shall be stored where it may interfere with the free and safe passage of public traffic, or in such a manner that it may create a hazard to the public. At the end of each day’s work, and at other times when construction operations are suspended for any reason, remove all equipment and other obstructions from that portion of the roadway/sidewalk open for use by public traffic.

C. Provide or construct, and maintain, temporary bridges of approved design across open trenches, temporary piping and wherever necessary, to provide vehicle and/or pedestrian access to residential, commercial, and industrial s properties and road crosswalks. Temporary bridge(s) across Hoover Creek for vehicle and/or pedestrian access at Downey Street is not required during the specified closure period.

D. Should the Contractor’s work prevent the governing body from clearing snow or removing accumulated rain water, take whatever steps necessary to ensure safe vehicle and pedestrian traffic around and through the Work Site.

E. Should the Contractor’s work interfere with the weekly collection of garbage, yard waste and recycling, take reasonable steps to ensure that garbage, yard waste and recycling is collected.

F. Sidewalk access to properties shall be maintained, with the addition of safety measures as required during the working day. Assist residents, employees, customers, etc. with accessing properties impacted by the Work. This includes assisting in the moving of heavy objects in restricted areas, helping disabled individuals over obstacles and whatever else is necessary.

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3.5 SITE CLEANLINESS

A. The Work Site shall be kept in a clean and neat condition and shall not be unnecessarily encumbered with equipment, materials, or debris.

B. At all times conduct the work in an orderly and tidy manner, and shall at suitable intervals, acceptable to the CO, remove from the Work Site any accumulation of rubbish or refuse matter.

At no time shall any person employed by the Contractor, or by any sub-contractors, discard litter or garbage or recyclables on or adjacent to the Work Site, except into suitable containers provided by the Contractor for this purpose.

C. Ensure that roads, sidewalks, and driveways impacted by the work are clean and swept at the end of the day, or as directed by the CO.

D. Prevent spillage from vehicles on public or private roads along which excavated spoil, construction materials, or refuse, is hauled, through tarping or other means. Where any such spillage occurs, it shall be promptly cleaned up.

E. Have appropriate equipment readily available for dust and mud control.

F. If the Contractor fails to clean the Work Site to the satisfaction of the CO, the Park Staff may undertake the work and deduct the associated cost from payments due to the Contractor.

3.6 WORK HOURS AT THE WORK SITE

A. Unless otherwise noted or agreed upon by the CO, the hours of work shall be from 7:00 am to

5:00 pm on any weekday. No work on Saturday, Sunday or a statutory holiday unless approved by the CO and communicated a minimum of 48 hours in advance to the affected public.

B. Schedule noisy work, including, but not limited to, pile driving, jack hammering, vacuum trucks, between 08:00 am and 5:00 pm.

C. Before and after the hours of work avoid nuisance noise including offloading of equipment or materials, warming up of heavy equipment, car stereos, slamming tailgates, backup beepers, workers yelling or any other thing that will generate nuisance noise.

D. Give the CO seven days notice of any planned Saturday, Sunday or Holiday Work.

3.7 SEGREGATION OF THE WORK SITE

A. Limit the Work, to the paved portion of the street, right-of-way, working space or work site as applicable. Public access to sidewalks on both sides of the street where possible, and to at least one side of the street as a minimum shall be maintained.

B. Provide unimpeded public access to the areas beyond the limits of the Work and prevent the public from entering all areas where Work is being performed.

C. At the end of each working day, or if left unattended, any open excavation shall be securely fenced. Construction fencing shall be used in urban areas.

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D. Protect the public through means such as bridges, ramps or barricade flashers over hoses and cords, fencing around equipment, or as otherwise directed by the CO.

3.8 PARKING

A. The following parking, in order of preference, is available to the Contractor for worker parking throughout the Contract duration and as directed by the CO:

1. Parking which the Contractor can create and maintain at the Work Site in compliance with all other requirements regarding vehicles on the Work Site, namely in designated staging areas

B. Coordinate and cooperate with the CO in the establishment and assignment of all work parking at the identified locations or any other location authorized by the CO, all at no extra cost to the

NPS.

C. Where necessary, be responsible for moving employees between parking area(s) and Work Site.

3.9 NOISE

A. Comply with the City of West Branch, or State of Iowa’s noise bylaw or the requirements below which ever is more stringent. Measurement of noise levels for the purpose of checking compliance with this requirement shall be done in accordance with the requirements of the applicable noise bylaw.

B. At no time during specified working hours shall the noise generated by the work, exceed the applicable bylaw limits, or, where no bylaw limits apply, “continuous” noise levels shall not exceed 85 dBA at the nearest property line, where “continuous” noise level is the noise level exceeded for more than 3 minutes in any 15 minute period.

C. Should the Contractor wish to work outside the limits of the noise bylaw, he shall submit to the

CO an alternative work plan for review and comment. The plan shall indicate the types of equipment that will be required to operate outside the specified limits, proposed locations of the equipment and a description of any noise control measures that will be implemented. Then apply to the governing entitity for a variance to the noise bylaw should it wish to work outside of the applicable limits.

D. Cooperate with the CO in choosing a location for stationary equipment to minimize noise to the public.

E. Apply to the governing municipality for noise variances to allow use of generator, dewatering pumps, dehumidifier or other equipment after hours. If approved, ensure that the noise from any equipment used after hours does not exceed 55 dBA measured at the lesser of: property line, or 15 M or, at the maximum specified by the governing municipality and the CO.

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F. The potential for noise impact to the commercial, industrial, and residential properties adjacent to the Work Site and access roads has been predicted based upon anticipated construction activities and equipment. Noise monitoring may be conducted in the adjacent residential areas by the CO throughout the project. If measurements indicate that the required noise levels are not being met, identify and implement noise control measures necessary to comply with applicable bylaws and these contractual requirements.

3.10 EQUIPMENT NOISE LIMITS

A. Prior to mobilization, submit to CO a list of all major equipment to be used on the Work Site throughout the Contract which will generate more that 85 dBA. This list shall include make, model and age, plus anticipated noise level based on manufacturer’s data and the contractors proposed noise reduction plans. The CO will accept or reject the use of specific equipment which produces higher noise levels. With the exception of any equipment specifically accepted by Corporation, the maximum acceptable noise level produced by any individual machine shall be 85 dBA when measured at 15 M from the equipment.

B. The work site shall be laid out to minimize the requirement for trucks and mobile equipment to back up. Back-up alarms shall be adjusted to be clearly audible above the ambient noise level, as required by OSHA but shall be no louder than necessary. Where after hours work is required and approved, OSHA approved alternatives to the use of back-up alarms may be required.

C. The CO reserves the right to test any equipment on the Work Site at any time to determine if equipment noise emission exceeded the Contract limits. Make any equipment, with operator, available for testing, at or near its working location, at no additional cost to the NPS.

D. In the event that any equipment does not satisfy the Contract noise level limits, the equipment shall be replaced by a quieter machine or it shall be modified, for example, by providing better exhaust silencing or reducing its governed engine speed, or building a sound enclosure and the alternate or modified machine may then be re-tested. The cost of any re-testing by the CO will be charged to the Contractor.

3.11 MAINTENANCE AND USE OF EQUIPMENT

A. Regular maintenance of equipment shall be undertaken to reduce noise and emissions produced by that equipment. This includes, but not limited to, regular greasing of treads, chassis and pivot points, replacement of worn parts, brake checks, mechanical overhauls, attention to exhaust and emission control systems and any special acoustical fixtures.

B. All equipment used on the Work Site shall be equipped with, and operated with, all applicable covers, hoods, shields, and guards in place and latched shut, and all exhaust and emission control systems in place and fully operational. Air-powered equipment such as rock drills and jackhammers shall be equipped with effective mufflers on the air exhausts. The manufacturer’s recommendation shall be followed.

C. Equipment, which is not in use, shall be shut down, and not left idling for periods longer than

15 minutes to reduce noise and negative impacts to air quality.

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D. Brakes on trucks shall be adjusted and maintained to avoid objectionable brake “squeal” or noise. Engine brakes shall not be used anywhere on the Work Site or on any access roads, except in an emergency.

E. Operators of excavating equipment shall use minimum power consistent with reasonable operation of equipment, and shall avoid banging of buckets on truck bodies, or other objects.

END OF SECTION 01 13 00

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031414 CONTRACT MODIFICATION PROCEDURES

SECTION 01 26 01 – CONTRACT MODIFICATION PROCEDURES

PART 1 - GENERAL

1.1 SUMMARY

A. The work of this section consists of administrative and procedural requirements for contract modifications.

1.2…