15-General Notices, Notes and Information.pdf

Preparer's Certification for

Specifications, Special Specifications, Special

Provisions, Estimate and Specification Data

Special Note:

The following items developed per the published Construction Drawings have been verified and included in the Purchasing Department's Bid

Specification Package which can be located https://harriscountytx.bonfirehub.com/portal.

The items include:

• Pricing/Delivery Information

• Scope of Work

• Special Provision to Standard Specifications

• Special Specifications

• Supplement to General Requirements

• Contract Time

FOR:

FAULKEY GULLY – HIKE AND BIKE

TRAIL

FROM SPRING CYPRESS RD TO

GUERNSEY DR

HC PRECINCT 3

UPIN NO. 23103MF2W701

RICHARD A. FULLER

90951 L I C E N S E D

PR O F E S S I O N A L E NG I N

EER

STA T E OF T EX AS

07/02/202508/08/2025 https://harriscountytx.bonfirehub.com/portal

TABLE OF CONTENTS

SCOPE OF WORK

GENERAL NOTICE TO CONTRACTORS

GENERAL NOTES

NOTICE TO CONTRACTORS TBPE POLICY

SPECIAL NOTICE TO CONTRACTORS - MATERIAL HAULING

NOTICE TO CONTRACTORS SWQ AND ENVIRONMENTAL ISSUES

NOTICE OF SPECIFICATIONS

SCOPE OF WORK

Project Scope for

Hike and Bike Trail – Faulkey Gully – From Spring Cypress Road to Guernsey Road

UPIN No. 23103MF2W701

IDS Project No. 0179-046-00

This project is for the construction of approximately 2.4 miles of Hike and Bike Trail along Faulkey

Gully (HCFCD K142-00-00), a tributary to Faulkey Gully (HCFCD K142-03-00), and a detention basin (HCFCD K542-00-00) located in northwest Harris County. The proposed improvements primarily include asphalt trails of either 10 feet or 8 feet in width located within the maintenance berm areas between the top of banks and the ROW lines. Also included is a 12-foot-wide concrete underpass at North Elderidge Parkway and a single-span pedestrian bridge over the tributary channel. Other ancillary improvements include concrete sidewalks, ADA ramps, rails, drainage structures, concrete channel lining, riprap, and the re-grading of backslope swales.

Actual field conditions may vary slightly from those shown in the plans due to construction activities taking place after the topographic survey was carried out. These activities included the construction of a 16-inch water line along Faulkey Gully and the tributary, as well as work done withing the channels and maintenance berms. Additional limited topographic survey work was performed to capture the majority of these activities and is reflected in the design. It is not anticipated that any variations in field conditions will significantly alter construction activities or schedule. The estimated total contract time for this project is 340 Calendar Days

Specifications and Standards from Harris County, Harris County Flood Control, and TxDOT are to be utilized for the construction of this project.

May 2019

GENERAL NOTICE TO CONTRACTORS

In accordance with House Bill 1059, a minimum of 25% of the work to be performed on this project shall be performed by the Bidder.

Special Notice: By law, the original price on firm fixed price contracts may not be increased by more than 25%. The original price may not be decreased by 18% or more without the consent of the contractor. Please monitor additions to your contract -additions in excess of 25% will not be paid under any circumstances.

On public works projects, all contractors shall supply a list of all suppliers and subcontractors with addresses and phone numbers, prior to work commencing.

At the time of the scheduled preconstruction meeting, the successful bidder shall supply to the County a list of representatives signed by an Officer of the Company who are authorized to sign official documents, i.e., Purchase Orders, Change Orders, Final Estimates, etc.

In determining who is a responsible bidder, Harris County may take into account the past performance of the bidder on Harris County projects. Commissioners Court adopted a written definition and criteria for determining the performance of a contractor which may be considered in determining the responsibility of a bidder.

Harris County is using an internet-based Construction Program Management Software, e-Builder to maintain consistent administrative and technical control for its projects throughout the County. The Contractor is required to use e-Builder on this project in accordance with procedures provided by the County.

At no cost to the Contractor, the County will provide system login account(s) and provide training for Contractor personnel. The Contractor must update e-Builder with any new or changed information within 24 hours of that information becoming known to Contractor. The Contractor must have access to a computer with internet access and a scanner to use eBuilder.

NOTICE TO CONTRACTORS

ON STORM WATER QUALITY AND

ENVIRONMENTAL ISSUES

In addition to the regulatory requirements stated in the General Conditions, the Contractor shall recognize and comply with the following:

SECTION 1. STORM WATER POLLUTION PREVENTION PLANS

A. COVERAGE

Coverage under the Texas Pollutant Discharge Elimination System (TPDES)

General Permit TXR150000 for storm water discharges associated with construction activities is required for a project that disturbs 1 acre or greater (or is a part of a larger common plan of development with the potential to disturb 1 acre or greater). Coverage requires the preparation, implementation, inspection, and maintenance of a Storm Water Pollution Prevention Plan (SWPPP), in accordance with the TPDES General Permit.

B. PROJECT CLASSIFICATION

This project is classified as one of three categories listed below. The

Contractor shall be responsible for the storm water quality items, accordingly.

1. “Construction Sites That Do Not Require TPDES General Permit

Coverage” The project disturbs less than 1 acre (and is not part of a common plan of development with the potential to disturb 1 acre or more); therefore, coverage under the TPDES General Permit is not required. However, the Contractor shall implement good housekeeping measures to minimize the potential for pollutants, associated with the construction activities, to enter the storm sewer system. Item 725, “General Source Controls”, shall be implemented by the Contractor, as well as any other erosion, sedimentation, and pollution controls shown in the plans and project manual.

or

2. “Small Construction Sites”

The project disturbs 1 acre or more, but less than 5 acres, (or is part of a common plan of development with the potential to disturb 1 acre or more);

therefore, coverage under the TPDES General Permit is required. The Contractor shall implement, inspect, and maintain the Storm Water Pollution Prevention Plan shown in the plans and project manual.

Certification of a TCEQ Small Construction Site Notice (CSN) in accordance with Part II.E.2 of the TPDES General Permit is required. The Contractor, as a primary operator, as defined by TPDES General Permit, shall certify one Construction Site Notice (CSN) and provide this to Harris County at the time that the contract is awarded. Harris County (owner), as primary operator, as defined by TPDES General Permit, shall certify a second Construction Site Notice (CSN) at the time the contract is awarded. After the project is awarded, Harris County shall provide copies of the two certified Construction Site Notices (CSN) to the Contractor, and send copies to the local storm sewer operator for notification purposes. Prior to commencing construction activities, the Contractor shall laminate and post the notices on the project site in a location where they are readily available for public viewing. The Contractor shall maintain the posted notices until after completion of the construction activities and final stabilization of the project site as defined by the TPDES General Permit. When the project is completed and stabilization is achieved, as defined by the TPDES General Permit, then the Contractor shall note the date that the Small Construction Site Notice was removed from the project site. A copy of the completed Small Construction Site Notice shall be provided to the Engineer with the SWPPP records. The County shall then notify the local storm sewer operator that storm water associated with construction activities is no longer being discharged from the site.

3. “Large Construction Sites”

The project disturbs 5 acres or greater (or is part of a common plan of development with the potential to disturb 5 acres or more); therefore, coverage under the TPDES General Permit is required. The Contractor shall implement, inspect, and maintain the Storm Water Pollution Prevention Plan shown in the plans and project manual. Certification of a Notice of Intent (NOI) in accordance with Part II.E.3 of the TPDES General Permit is required and shall be completed in accordance with Harris County Specification Item Number 700. The Contractor shall not commence with any earth disturbing activities on the project site until:

• at least seven (7) days after submittal of the NOI (Harris County & Contractors) via U.S. Postal Service, or if Utilizing electronic submittal, prior to commencing construction activities,

• copies of signed NOI’s are submitted to any municipal separate storm sewer system (MS4) receiving discharge, at least seven (7) days prior to commencing construction activities. Contractor shall list in the SWPPP the names and addresses of all MS4 operators receiving a copy.

• copies of the Certified NOI’s are posted in a publicly accessible location (copies shall be laminated or placed in weather resistant display case),

• and copies (Harris County & Primary Contractors) of construction site notice for large sites (CSN) are posted in a publicly accessible location. After construction activities are complete and final stabilization is achieved (as defined by the TPDES General Permit), the Contractor shall certify one Notice of Termination (NOT) form and provide it to Harris County. Harris County shall certify a second NOT form. Harris County shall submit the two NOTs to the TCEQ and the local storm sewer system operator. After the NOTs have been submitted to the TCEQ, then the Contractor shall remove all temporary SWPPP controls, cease SWPPP inspections, and deliver copies of all SWPPP records to the Engineer who shall archive them for a minimum of three years. The final payment to the Contractor may be held until all SWPPP records are received by the Engineer.

SECTION 2. STORM WATER QUALITY MANAGEMENT PLANS

A. COVERAGE

If this project meets the definition of “new development” or “significant redevelopment” as defined in the Harris County regulations or City of Houston ordinance on storm water quality and the project is not “grandfathered” or “exempt” as defined by the regulation or ordinance, then a Storm Water Quality Management Plan (SWQMP) is required for the project, as shown in the construction plans.

B. CLASSIFICATION

This project is classified as one of three categories listed below. The Contractor shall be responsible for the storm water quality items, accordingly.

1. “SWQ Permit Within Unincorporated Harris County”

If a Storm Water Quality Management Plan with permanent storm water quality controls is shown in the construction plans and the project is located in unincorporated Harris County, then a Storm Water Quality Management Plan is required prior to the start of construction. Prior to the start of construction, the Engineer shall submit the plans and Written Storm Water Quality Management Plan to the Harris County Permits Group and obtain the necessary signatures acknowledging acceptance of the Storm Water Quality Management Plan. The Contractor shall construct the SWQMP structural controls in accordance with the construction plans, and maintain the SWQMP structural controls until completion of the project and until the Engineer can certify that the SWQMP structural controls are constructed in accordance with the plans.

2. “SWQ Permit Within City of Houston” If a Storm Water Quality Management Plan with permanent storm water quality controls is shown in the construction plans and the project is located in the jurisdiction of the City of Houston, then a Storm Water Quality Management Permit is required prior to the start of construction.

Prior to the start of construction, the Engineer shall submit to the City of Houston the construction plans, the City of Houston Storm Water Quality Management Plan Application for Permit, and all other related documents shown on the permit application and obtain the Storm Water Quality Management Permit. Prior to the start of construction, the Contractor shall post a performance bond to the City of Houston for the construction of the storm water quality structural controls. The Contractor shall post a copy of the issued permit on the project site, construct the SWQMP structural controls in accordance with the construction plans, and maintain the SWQMP structural controls until completion of the project and until the Engineer can certify that the SWQMP structural controls are constructed in accordance with the plans.

The Engineer shall submit the Storm Water Quality Permit As-built Certificate to the City of Houston and Harris County shall begin implementation of the SWQMP.

3. “Grandfathered or Exempt from SWQ Permit” or “Storm Water Quality

Bank” If a Storm Water Quality Management Plan, or permanent storm water quality feature, is not shown in the construction plans, then a Storm Water Quality Management Permit is not required prior to the start of construction because it is grandfathered, exempt, or has provided storm water quality measures through the Storm Water Quality Bank.

SECTION 3. OTHER ENVIRONMENTAL ISSUES

A. BIOLOGICAL ISSUES

In accordance with requirements under the federal Migratory Bird Treaty Act, if in the course of construction, a bird rookery, an identified special migratory bird habitat, or a nesting site is discovered on the project site, then the Contractor shall cease work in the area and immediately notify the Engineer.

In accordance with the Federal Endangered Species Act and the Texas Parks and Wildlife Code, if a biological mitigation plan for specially protected flora and fauna species has been provided within the construction plans, then the Contractor shall comply with all requirements noted within the plan.

B. WATERS OF THE UNITED STATES INCLUDING ADJACENT WETLANDS

In accordance with Section 404 and Section 401 of the Clean Water Act and Section 10 of the Rivers and Harbors Act, waters of the United States including adjacent wetlands shall not be impacted by the Contractor unless a Department of the Army Permit has been obtained from the U.S. Army Corps of Engineers for the project.

If Harris County has obtained a Department of the Army Permit for this project, a copy of the permit is provided in the project manual. The Contractor shall comply with all requirements of the Department of the Army Permit. The Contractor shall not impact any waters of the United States and adjacent wetlands greater than the area and volume shown in the permit. If the Contractor impacts waters of the United States including adjacent wetlands on the project site that exceeds the area and volume shown in the permit, then the Contractor shall be responsible for any violations that may be issued by the regulatory agencies. If the Contractor deems it necessary to impact waters of the United States including adjacent wetlands that exceed the permit, then the Contractor must first notify the Engineer and the Engineer may obtain the necessary regulatory clearances prior to allowing the additional impacts to occur.

During construction of the project, if the Contractor uses off-site areas (not owned by Harris County) for placement of borrow material, disposal of construction debris, staging of construction materials, usage as a field office, or other types of construction related activities, then the Contractor shall be solely responsible for obtaining all environmental permits for the off-site activity, as well as providing all environmental controls and compensatory mitigation requested by the permitting agency. If a regulatory violation occurs as a result of this off-site activity, then the Contractor shall be solely responsible for this violation.

C. STATE OWNED SUBMERGED LANDS

The Contractor shall not impact submerged lands regulated under the authority of the Texas General Land Office, or other local agency, without an easement agreement. If an easement agreement is necessary for the construction activities, then the easement agreement shall be obtained by Harris County.

D. CULTURAL RESOURCES

In accordance with the National Historic Preservation Act and the Antiquities Code of Texas, the Contractor shall not remove or disturb, or cause or permit to be removed or disturbed, any historical, archeological, architectural, or other cultural artifacts, relics, vestiges, remains, or objects of antiquity from the project site. In the event that such items are discovered on the project during construction activities, the Contractor shall immediately notify the Engineer. The site and the potentially significant material shall be protected by the Contractor from further disturbance until a professional examination of them can be made and/or until clearance to proceed with construction has been provided by the Engineer.

E. HAZARDOUS AND PETROLEUM SUBSTANCES

If during the course of construction, the Contractor discovers hazardous or petroleum substances or wastes on the project site, then the Contractor shall immediately cease work in the area and remove all personnel from the area. The contractor shall temporarily close the area to the public, as well; temporary fencing or caution tape shall be installed around the area. The Contractor shall notify the Engineer immediately. Work in the area shall not be permitted until the Engineer has determined that safety and environmental issues have been properly addressed.

NOTICE OF SPECIFICATIONS

For the construction of this project, the Contractor shall use the attached Special Provisions, Special Specifications, and Harris County Engineering Department (HCED) Specifications Book – Harris County Standard Specifications for Construction and Maintenance of Roads and Bridges, effective date September 1, 2017. The current HCED specifications may be found at the HCED website: http://www.eng.hctx.net/Portals/33/Publications/professional-services/spec/2017/2017_HC_Stand_Spec.pdf

When applicable, the Contractor shall use the Harris County Flood Control District (HCFCD) 2005 Standard Specifications Book. The current HCFCD specifications may be found at the HCFCD website: https://www.hcfcd.org/Technical-Manuals/all-documents?folderId=8625& view=gridview&pageSize=10

When applicable, the Contractor shall also use the Texas Department of Transportation (TxDOT) 2014 Standard Specifications Book. The current TxDOT specifications may be found at the TxDOT website: https://www.txdot.gov/business/resources/txdot-specifications.html

When applicable, the Contractor shall also use the City of Houston (COH) Standard Specifications. The current COH specifications may be found at the COH website:

https://www.houstonpermittingcenter.org/office-city-engineer/design-and-construction-standards http://www.eng.hctx.net/Portals/33/Publications/professional-services/spec/2017/2017_HC_Stand_Spec.pdf http://www.eng.hctx.net/Portals/33/Publications/professional-services/spec/2017/2017_HC_Stand_Spec.pdf https://www.hcfcd.org/Technical-Manuals/all-documents?folderId=8625&%20view=gridview&pageSize=10 https://www.hcfcd.org/Technical-Manuals/all-documents?folderId=8625&%20view=gridview&pageSize=10 https://www.txdot.gov/business/resources/txdot-specifications.html https://www.txdot.gov/business/resources/txdot-specifications.html https://www.houstonpermittingcenter.org/office-city-engineer/design-and-construction-standards https://www.houstonpermittingcenter.org/office-city-engineer/design-and-construction-standards

INDEX OF

SPECIAL SPECIFICATIONS

FAULKEY GULLY - HIKE AND BIKE TRAIL

FROM SPRING CYPRESS RD TO GUERNSEY DR

HARRIS COUNTY ENGINEERING DEPARTMENT

UPIN No. 23103mf2w701

IDS PROJECT NO. 0179-046-00

Doc.

No.__ Document Title

SPECIAL SPECIFICATION

SS 2005 Filter Fabric SS 5001 Geogrid Base Reinforcement SS 4020 Pre-Engineered Pedestrian Bridge

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Special Specification 2005

Filter Fabric

1. DESCRIPTION

Furnish and place filter fabric (geotextiles) consisting of a single layer of approved fabric, in accordance with the details shown on the plans and this specification. This item is intended to be placed on top of a subgrade in order to separate the fine-graded or clayey subgrade from a much coarser base material.

2. MATERIALS

Provide fabric meeting the requirements of Departmental Material Specification DMS-6200, “Filter Fabric,” of the type shown on the plans.

3. CONSTRUCTION

Prepare the existing subgrade and embankment as indicated on the plans or as directed. Set string lines for alignment if directed. Install geotextiles in accordance with the lines and grades as shown on the plans. Any defects, rips, holes, flaws, or damage to the material may be cause for rejection. Roll the geotextile onto the prepared existing subgrade and pull taut to remove wrinkles. Place geotextile in one sheet to the greatest extent possible or as directed by the Engineer. Overlap geotextile panels on all exposed edges 8 ± 2 in.

Place a minimum of 200 sq. ft. of geotextile at locations requiring odd shapes. Cut the geotextile to fit around utility castings and when contouring for other penetrations and gradual curvatures. Keep the fabric material free from tension, stress, folds, wrinkles, or creases.

Free edge of the geotextile should extend 4 in. or more beyond the base course and into a location that facilitates drainage. Secure edges by staking or pinning at 6-ft. intervals if the geotextile edges are displaced because of natural or induced wind forces. Use geotextile manufacturer’s recommendation for securing edges. Exposure of geotextiles to the elements between laydown and cover shall be kept to a minimum. In any case, exposure shall not exceed 15 days.

Store the geotextiles in accordance with manufacturer’s recommendations. Do not remove it from its protective wrapping until ready for use.

Do not allow traffic to be in direct contact with the geotextiles except for the equipment used to place, spread, and grade the new embankment material. Turn equipment gradually and keep turning movements to a minimum to avoid damage to geotextiles.

Repair any wind damage, traffic damage, or damage caused by any type precipitation at no additional cost to the Department.

The Engineer may suspend work if attempts at securing the geotextile are unsuccessful. Remove and replace damaged or excessively deformed areas. For punctured, torn, or damaged geotextile, provide a minimum area of 200 sq. ft. of replacement material.

Lap repair areas a minimum of 18 in. in all directions. Repair excessively deformed materials underlying the geotextile as directed.

For construction procedures not addressed, install geotextile using the manufacturer’s recommended installation procedures or as directed.

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4. MEASUREMENT

This Item will be measured by the square yard based on the calculated quantity shown on the plans with no allowance made for overlapping at joints or for material overlaps resulting from material repair operations.

This is a plans quantity measurement Item. The quantity to be paid for is shown in the proposal unless modified by Article 9.2, “Plans Quantity Measurement.” Additional measurements or calculations will be made if adjustments of quantities are required.

5. PAYMENT

The work performed and materials furnished in accordance with this Item and measured as provided under “Measurement” will be paid for at the unit price bid for “Filter Fabric” of the type specified. This price is full compensation for furnishing, preparing, hauling, and placing materials including labor, materials, freight, tools, equipment, and incidentals.

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Special Specification 5001

Geogrid Base Reinforcement

1. DESCRIPTION

Furnish and place geogrid base reinforcement in accordance with the lines and grades shown on the plans or as directed.

2. MATERIALS

Provide geogrid base reinforcement, of the type shown on the plans, meeting the requirements of DMS-6240 “Geogrid for Base/Embankment Reinforcement.” Use roll widths and lengths shown on the plans or as approved.

3. CONSTRUCTION

Prepare the subgrade as indicated on the plans or as directed. Set string lines for alignment if directed.

Install geogrid in accordance with the lines and grades as shown on the plans. Place base material in lift thicknesses and compact as shown on the plans or as directed. Do not operate tracked construction equipment on the geogrid until a minimum fill cover of 6 in. is achieved. Rubber tire construction equipment may operate directly on the geogrid at speeds of less than 5 mph if the underlying material will support the loads. Where excessive substructure deformation is apparent, correct grid placement operations as recommended by the manufacturer or as directed

3.1. Geogrid Placement. Orient the geogrid length as unrolled parallel to the direction of roadway. Overlap geogrid sections as shown on the plans or as directed. Use plastic ties at overlap joints or as directed.

Placement of geogrid around corners may require cutting and diagonal lapping. Pin geogrid at the beginning of the backfill section as directed. Keep geogrid taut at the beginning of the backfilling section but not restrained from stretching or flattening.

3.1.1. Longitudinal Joints. Overlap longitudinal joints by a minimum of 1 ft. Space longitudinal ties 10 ft. to 20 ft.

or as directed.

3.1.2. Transverse Joints. Overlap transverse joints by a minimum of 1 ft. Space transverse ties 4 ft. to 5 ft. or as directed.

3.2. Damage Repair. As directed, remove and replace contractor damaged or excessively deformed areas without additional compensation. Lap repair areas a minimum of 3 ft in all directions. Tie each side of repair grid in at least 3 locations but do not exceed normal construction spacing; tie spacing for odd shapes will be as directed. Repair excessively deformed materials underlying the grid as directed

4. MEASUREMENT

Geogrid base reinforcement will be measured by the square yard of roadway placement as shown in the plans with no allowance for overlapping at transverse and longitudinal joints.

5. PAYMENT

The work performed and materials furnished in accordance with this Item and measured as provided under “Measurement” are paid for at the unit bid price for “Geogrid Base Reinforcement” of the type specified. This

2 11-14 Statewide price is full compensation for furnishing, preparing, hauling and placing materials including labor, materials, freight, tools, equipment and incidentals.

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SPECIAL SPECIFICATION

ITEM 4020

PRE-ENGINEERED PEDESTRIAN BRIDGE

4020.1 DESCRIPTION.

This Item shall govern for the furnishing and installing in place a single span pre-engineered pedestrian bridge.

4020.2 REFERENCES.

A. American Association of State Highway and Transportation Officials

(AASHTO)

1. ”Guide Specifications for Design of Pedestrian Bridges”

2. “LRFD Bridge Design Specifications”

B. AISC Steel Construction Manual “Code of Standard Practice for

Steel Buildings and Bridges”

C. ASTM A242 “Standard Specification for High-Strength Low-Alloy Structural Steel”

D. ASTM A588 “Standard Specification for High-Strength Low-Alloy

Structural Steel, up to 50 ksi [345 MPa] Minimum Yield Point, with Atmospheric Corrosion Resistance”

E. ASTM A606 “Standard Specification for Steel, Sheet and Strip, High-

Strength, Low-Alloy, Hot-Rolled and Cold-Rolled, with Improved

F. ASTM A847 “Standard Specification for Cold-Formed Welded and

Seamless High-Strength, Low-Alloy Structural Tubing with Improved

G. ASTM D7031 “Standard Guide for Evaluating Mechanical and

Physical Properties of Wood-Plastic Composite Products”

H. ASTM F3125 “Standard Specification for High Strength Structural Bolts, Steel and Alloy Steel, Heat Treated, 120 ksi (830 MPa) and 150 ksi (1040 MPa) Minimum Tensile Strength, Inch and Metric Dimensions”

Item 4020 Page-2-

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I. American Wood Protection Association (AWPA) U1 “Use Category

System: User Specification for Treated Wood”

J. American Welding Society (AWS)

1. D1.1 “Structural Welding Code – Steel”

2. D1.5 “Bridge Welding Code”

K. Steel Structures Painting Council (SSPC) SP 7 “Brush-Off Blast Cleaning”

L. Texas Accessibility Standards (TAS)

1. Chapter 3, 302 “Floor or Ground Surfaces”

2. Chapter 3, 304 “Turning Space”

3. Chapter 3, 308 “Reach Ranges”

4. Chapter 5, 505 “Handrails”

4020.3 MATERIALS.

The pedestrian bridge shall be fabricated from steels conforming to ASTM A242, ASTM A588, ASTM A606, and ASTM A847, self-weathering steel, in accordance with Harris County Item 442. Bolted connections shall be made with bolts conforming to ASTM F3125 in accordance with Harris County Item 445.

Decking shall be No. 1 dense yellow pine plank in accordance with Harris County Item 455. Douglas Fir or IPE wood or composite boardwalk lumber may be used for decking with the approval of the Engineer. Wood planking shall be ACQ pressure treated to a retention level suitable for Use Category 4b (US4B) per the requirements of AWPA Standard U1 for ground contact.

4020.4 QUALIFIED SUPPLIERS.

A. Each bidder is required to identify their intended bridge supplier as part of the bid submittal.

B. Pre-approved manufacturers are:

1. Continental Bridge

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2. U.S. Bridge

3. Steadfast Bridges

4. Roscoe Bridges

C. The contractor must provide the following documentation, for any proposed supplier who is not approved:

1. Product literature

2. All documentation to ensure the proposed substitution will be in compliance with these specifications. This shall include:

a. Representative design calculations

b. Representative drawings

c. Splicing and erection procedures

d. Warranty information

e. Inspection and Maintenance procedures

f. AISC Shop Certification

g. Welder Qualifications

3. Qualified suppliers must have at least five (5) years experience fabricating these type structures and a minimum of five (5) successful bridge projects, of similar construction, each of which has been in service at least three (3) years. List the location, bridge size, owner, and a contact for reference for each project. The Engineer will evaluate and verify the accuracy of the submittal prior to bid. If the Engineer determines that the qualifying criteria have not been met, the contractor’s proposed supplier shall be rejected.

4020.5 ENGINEERING SPECIFICATIONS.

A. The span, width and camber shall be as specified in the drawings and shall be designed for a minimum uniform live load of 85 psf.

B. The truss shall be designed as a Pratt Truss for pedestrian live load, occasional maintenance vehicles, wind load, and load combinations

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in accordance with Section 1.2 of the AASHTO “Guide Specifications for Design of Pedestrian Bridges.”

C. For the maintenance vehicles, use a 10,000-pounds AASHTO

Standard H Truck (H-5) for clear deck width from 6 ft. to 10 ft. and a 20,000-lb. AASHTO Standard H Truck (H-10) for clear deck widths over 10 ft.

D. Live loads and concentrated loads are an either-or proposition and are not to be applied to the bridge at the same time.

E. Wind loadings shall be 35 psf on full vertical surface, as if enclosed.

F. Design railing as 42-in. pedestrian railing (54” for bicycle use) in accordance with the latest AASHTO requirements for pedestrian railing.

G. Design bridge deck surfaces to meet the requirements of TAS

Chapter 3, Section 302 and 304. When bridge deck grade is equal to or greater than 5%, provide accessible handrails meeting the requirements of the TAS Chapter 3, Section 308 and Chapter 5, 505.

H. Deflection. The vertical deflection of the bridge due to pedestrian live load shall not exceed L/400 of the span length.

I. The minimum thickness of all structural steel members be 3/16” nominal and shall be designed in accordance with AISC Steel Construction Manual “Code of Standard Practice for Steel Buildings and Bridges.”

J. Field splices shall be as far off center as practical for shipping considerations.

4020.6 FABRICATION AND FINISH.

All fabrication and finish shall be in accordance with Harris County Item 441.

Welding shall be done in accordance with Harris County Item 446.

All welding shall be done by welders certified by AWS. All welding shall be in conformance with AWS D1.5.

The bridge shall have one web diagonal per panel as show in the plans.

The bridge shall consist of maintenance-free “weathering” steel finish or hot-dipped galvanized steel or painted as shown on the plans.

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Decking shall run from side to side and have steel members beneath for support, with two outside supports and a minimum of one center support of the same weather steel as the structure.

Wood decking shall be a nominal 2" x 10" in size. Decking shall be yellow pine or Douglas Fur or IPE wood or Composite boardwalk lumber. The decking shall meet ADA recommendations for slip resistance when tested in accordance with ASTM D7031.

Concrete decking where specified in the plans shall meet the requirements of Harris County Item 420.

The bridge shall have safety rails on the outside, meeting the geometry and strength requirements of current AASHTO “LFRD Bridge Design Specifications.”

4020.7 GENERAL REQUIREMENTS.

A. Drain Holes. When the collection of water inside a structural tube is a possibility, either during construction or during service, the tube shall be provided with a drain hole at its lowest point to let water out.

Manufacturer shall provide gaps in decking or scuppers in concrete deck to allow for drainage.

B. Welds. Special attention shall be given to developing sufficient weld throats on tubular members. Fillet weld details shall be in accordance with AWS D1.1, Section 3.9 (AWS Figure 3.2). Unless determined otherwise by testing, the loss factor “Z” for heel welds shall be in accordance with AWS Table 2.8. Fillet welds which run onto the radius of a tube shall be built on to obtain the full throat thickness (see AWS Figure 7.1). The maximum root openings of fillet welds shall not exceed 3/16” in conformance with AWS D1.1, Section 5.22. Weld size or effective throat dimensions shall be increased in accordance with this same section when applicable (i.e.

fit-up gaps > 1/16”).

C. The fabricator shall have verified that the throat thickness of partial joint penetration groove welds (primarily matched edge welds or the flare-bevel groove welds on under-hung floor beams) shall be obtainable with their fit-up and weld procedures. Matched edge welds shall be “flushed” out when required to obtain the full throat or branch member wall thickness.

D. For full penetration butt welds of tubular members, the backing material shall be fabricated prior to installation in the tube so as to be

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continuous around the full tube perimeter, including corners.

Backing may be of four types:

1. A “box” welded up four (4) plates.

2. Two “channel” sections, bent to fit the inside radius of the tube, welded together with full penetration welds.

3. A smaller tube section which slides inside the spliced tube.

4. A solid plate cut to fit the inside radius of the tube.

E. Corners of the “box” backing, made from four plates, shall be welded and ground to match the inside corner radii of the chords. The solid plate option shall require a weep hole either in the chord wall above the “high side” of the plate or in the plate itself. In all types of backing, the minimum fit-up tolerances for backing must be maintained at the corners of the tubes as well as the “flats”.

4020.8 DELIVERY AND ERECTION.

A. The bridge manufacturer will provide detailed, written instruction in the proper lifting procedures and splicing procedures (if required).

B. The bridge manufacturer shall provide written inspection and maintenance procedures to be followed by the bridge owner.

4020.9 BEARINGS.

A. Bridge bearings shall consist of a steel or high molecular weight plastic setting or slide plate placed on the abutment or grout pad.

The bridge bearing plate which is welded to the bridge structure shall bear on this setting plate. One end of the bridge will be fixed by fully tightening the nuts on the anchor bolts at that end. The exposed end will have finger tight only nuts to allow movement under thermal expansion or contraction. The bridge bearings shall sit in a recessed pocket on the concrete abutment.

B. Minimum 28-day strength for the abutment concrete shall be 3000 psi. The bearing seat shall be a minimum of 16” wide. The step height (from bottom of bearing to top-of-deck) shall be determined by the bridge manufacturer.

C. Bridges in excess of 100 feet in span or bridges with dead load reactions of 15,000 pounds or more (at each bearing location) shall have high molecular weight plastic or Teflon or stainless steel on

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Teflon slide bearings placed between the bridge bearing plate and the setting plate. The top slide plate shall be large enough to cover the lower Teflon slide surface at both temperature extremes.

4020.10 FOUNDATIONS.

A. Unless specified otherwise, the bridge manufacturer shall determine the number, diameter, minimum grade and finish of all anchor bolts.

The anchor bolts shall be designed to resist all horizontal and uplift forces to be transferred by the superstructure to the supporting foundations. Engineering design of the bridge supporting foundations (abutment, pier, bracket and/or footing), including design of anchor bolt embedment, shall be the responsibility of the foundation engineer.

B. The contractor shall provide all materials for installation of anchor bolts provided by the manufacturer, and construction of the bridge supporting foundations.

C. The contactor shall install the anchor bolts in accordance with the manufacturer’s anchor bolt spacing dimensions.

D. Information as to bridge support reactions and anchor bolt locations will be furnished by the bridge manufacturer after receipt of order and after the bridge design is complete.

4020.11 QUALITY CONTROL.

A. Bridge(s) shall be fabricated by a fabricator who is currently certified by the American Institute of Steel Construction to have the personnel, organization, experience, capability, and commitment to produce fabricated structural steel for the category “Simple Steel Bridges” as set forth in the AISC Certification Program. Quality control shall be in accordance with procedures outlined for AISC certification.

B. Finishing - Blast Cleaning. Bare applications of enhanced corrosion resistant steels.

1. To aid in providing a uniformly “weathered” appearance, all exposed surfaces of steel shall be blast cleaned in accordance with SSPC SP 7.

2. Exposed surfaces of steel shall be defined as those surfaces seen from the deck and from outside of the structure.

Stringers, floor beams, lower diagonals and the inside face of

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the truss below deck and bottom face of the bottom chord shall not be blasted.

4020.12 WARRANTY.

The bridge manufacturer shall warrant their steel structure(s) to be free of design, material, and workmanship defects for a period of ten years from the date of delivery.

4020.13 APPROVAL CHECKLIST.

Prepare and submit detailed shop drawings for review and approval.

Electronic submittal is required. The following checklist will be used in the evaluation of all submittals to assure compliance with this specification for Prefabricated Bridges. This checklist is considered the minimum acceptable requirements for compliance with these specifications. Any deviations from this checklist shall be considered grounds for rejection of the submittal. Any costs associated with delay caused by the rejection of the submittal, due to non-compliance with this checklist, shall be fully borne by the contractor and bridge supplier.

Submittal Drawings. Data required to be shown:

❑ Bridge Elevation ❑ Bridge Cross Section ❑ All Member Sizes ❑ All Vertical Truss Members are Square or Rectangular Tubing ❑ Bridge Reactions ❑ General Notes Indicating ❑ AISC Stress Conformance ❑ Material Specifications to be Followed ❑ Design Live Load ❑ Design Vehicle Load (If Applicable) ❑ Design Wind Load Stiffness (if applicable) ❑ Other Specified Design Loads ❑ Welding Process ❑ Blast Cleaning ❑ Paint System to be Used (If Applicable) ❑ Paint Color Chart (If Applicable) ❑ Detailed Bolted Splices (If Applicable) ❑ Bolted Splice Location (If applicable) ❑ Signature and Seal of Professional Engineer, licensed in state of Texas

Fabrication Submittals. Data required to be shown:

❑ Written Installation Instructions**

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❑ Written Splicing Instructions** ❑ Written Maintenance & Inspection Instructions** ❑ Welder Certifications** ❑ Welding Procedures** ❑ Material Certifications (if applicable) ❑ Structural Steel (if applicable) ❑ Decking (if applicable) ❑ Structural Bolts (if applicable) ❑ Quality Control Section of AISC Certification Manual (if applicable)** ❑ Painter Certifications (if applicable)** ❑ Weld Testing Reports (if applicable)

** NOTE. These items are required to be submitted along with Submittal Drawings and Design Calculations. Those Fabrication Submittal Items not marked are to be submitted prior to shipment of the bridge.

Design Calculations. Data required to be shown:

❑ Data Input for 3-D Analysis of Bridge ❑ Joint Coordinates & Member Incidences ❑ Joint and Member Loads ❑ Member Properties ❑ Load Combinations ❑ AISC Member Stress Checks for Each Member Type ❑ Critical Connection Failure Mode Checks for Each Member Type ❑ Chord Face Plastification Checks ❑ Punching Shear Checks ❑ Material Failure Checks (Truss Webs) ❑ Weld Failure Checks (Effective Length) ❑ Weld Failure Checks (Ultimate) ❑ Local Buckling of the Main Member Face Checks ❑ Main Member Yielding Failure Checks ❑ Main Member Crippling Failure Checks ❑ Main Member Buckling Failure Checks ❑ Main Member Shear Failure Checks ❑ All Bolted Splice Checks (if applicable) ❑ Main Truss Deflection Checks ❑ Decking Material Checks ❑ “U-Frame” Stiffness Checks (if applicable) ❑ Interior and End Portal Design Checks (if applicable) ❑ Determination of Top Chord K Factor Based on “U-Frame” ❑ Consideration of Individual Member Moments Due to Truss Deflection, Joint Fixity and Joint Eccentricity

4020.14 MEASUREMENT AND PAYMENT.

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Payment shall be made by the lump sum for the pre-engineered, prefabricated bridge, which price shall be for furnishing and fabricating all materials, delivering and unloading the bridge at the construction site and installing the bridge in place, including all necessary cost of engineering and including all tools, equipment and labor necessary to do the work.

The description and unit for this Item are:

Pre-Engineered Pedestrian Bridge 10 feet Wide Lump Sum (Installed in Place)

Pre-Engineered Pedestrian Bridge 12 feet Wide Lump Sum (Installed in Place)

NOTE: This Specification Requires Standard Specifications

Item 420 “Concrete Structures” Item 441 “Steel Structures” Item 442 “Metals for Structures” Item 445 “Structural Bolting” Item 446 “Structural Welding” Item 455 “Timber for Structures” Item 456 “Timber Structures”

END OF ITEM 4020

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SUMMARY SHEET

ITEM 4020

Other Specifications Required.

Item 420 Concrete Structures Item 441 Steel Structures Item 442 Metals for Structures Item 445 Structural Bolting Item 446 Structural Welding Item 455 Timber for Structures Item 456 Timber Structures

Reference Standards.

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

1. ”Guide Specifications for Design of Pedestrian Bridges”

2. “LRFD Bridge Design Specifications”

B. AISC Steel Construction Manual “Code of Standard Practice for Steel Buildings and Bridges”

C. ASTM A242 “Standard Specification for High-Strength Low-Alloy Structural Steel” D. ASTM A588 “Standard Specification for High-Strength Low-Alloy Structural Steel, up to 50 ksi [345 MPa] Minimum Yield Point, with Atmospheric Corrosion Resistance”

E. ASTM A606 “Standard Specification for Steel, Sheet and Strip, High-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled, with Improved Atmospheric Corrosion Resistance”

F. ASTM A847 “Standard Specification for Cold-Formed Welded and Seamless High- Strength, Low-Alloy Structural Tubing with Improved Atmospheric Corrosion Resistance”

G. ASTM D7031 “Standard Guide for Evaluating Mechanical and Physical Properties of Wood-Plastic Composite Products”

H. ASTM F3125 “Standard Specification for High Strength Structural Bolts, Steel and Alloy Steel, Heat Treated, 120 ksi (830 MPa) and 150 ksi (1040 MPa) Minimum Tensile Strength, Inch and Metric Dimensions”

I. American Wood Protection Association (AWPA) U1 “Use Category System: User Specification for Treated Wood”

J. American Welding Society (AWS)

1. D1.1 “Structural Welding Code – Steel”

2. D1.5 “Bridge Welding Code”

K. Steel Structures Painting Council (SSPC) SP 7 “Brush-Off Blast Cleaning” L. Texas Accessibility Standards (TAS)

1. Chapter 3, 302 “Floor or Ground Surfaces”

2. Chapter 3, 304 “Turning Space”

3. Chapter 3, 308 “Reach Ranges”

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4. Chapter 5, 505 “Handrails”

Description.

This Item discusses the furnishing and installing in place a single span pre-engineered pedestrian bridge.

Payment.

Paid for by Lump Sum.

DO NOT INCLUDE THIS SUMMARY IN THE CONTRACT SPECIFICATIONS.