B08_Attachment_1_Statement_of_Work_2025_0611.pdf

Statement of Work (SOW)

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Little Darby-Little Creek Trail Bridge

BLM CA – Northern California District Arcata Field Office

1 Background on the Government’s Requirement

2 General Scope of Work

2.1 Place of Performance:

2.2 Delivery Location:

2.3 Period of Performance:

3 Overall Objective(s)

4 Specific Tasks

Task 1: Provide Pre-Engineered Design Drawings: Structural Diagrams, Shop Drawings, and Calculations of Prefab FRP Bridge

Task 2: Fabrication

Task 3: Delivery

5 Delivery / Performance Schedule

5.1 Deliverables

6 Government-Furnished Property, Materials, Services

7 Security and Administrative Matters

8 Technical Exhibits and Definitions

9 EXHIBIT A: Delivery Site Map

10 EXHIBIT B: New Bridge Specifications

10.1 Bridge and Design Requirements

10.2 Equestrian Live Load Main Members

10.3 Design Details

10.4 Materials

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1 Background on the Government’s Requirement This project will replace the Little Darby-Little Creek Fiberglass Trail Bridge constructed in 2012. The bridge was destroyed by a fallen 24-inch diameter tree that split the bridge at the center. The bridge is near the trail head located approximately 5 miles east of Willits, in Mendocino County, California (39.437032, -123.257711), see EXHIBIT A:

Delivery Site Map. This is a popular trail and picnic area that is used by over 7,500 visitors annually including many children. It is imperative that the trail bridge is designed to ensure the health and human safety of the public as they access the Little Darby Environmental Education Area.

The Bureau of Land Management (BLM) has a requirement for the fabrication, pre-engineered designs and delivery of one fiber reinforced polymer (FRP) bridge that is 50 feet long, 6 feet wide, and has 54” railing for assembly/installation by BLM staff. Bridge load shall be 90 pounds per square foot. The bridge must be able to support equestrian loads meaning the deck shall be designed for a patch load of 1.00 Kip over a square area measuring 4.0 in. on each side. See American Association of Highway and Transportation Officials (AASHTO)- Load and Resistance Factor Design (LRFD), C3.3. The equestrian load is intended to ensure adequate punching shear capacity of pedestrian bridge decks where horses are accepted.

2 General Scope of Work The services required are the fabrication and pre-engineered designs of one FRP bridge at the place of performance, and the subsequent delivery to the project location where BLM staff will assemble and install the bridge.

The contractor shall fabrication and pre-engineered designs the bridge members such that the final assembly meets all bridge requirements established by BLM in EXHIBIT B:

New Bridge Specifications.

2.1 Place of Performance:

fabrication and pre-engineered designs of the bridge components/members shall take place under the supervision of a licensed engineer who will sign off on the work. All bridge components, members, decking, hardware, and instructions will be shipped on a single truck to the bridge replacement project site where BLM staff will assemble and install the bridge, see EXHIBIT A: Delivery Site Map.

2.2 Delivery Location:

The Delivery Location for this project contract is the parking area of the Little Darby Education Area, located on Canyon Road, approximately 5 miles East of Willits, California (39.437032, -123.257711). See EXHIBIT A: Delivery Site Map. Delivery Route instructions are provided in Task 3: Delivery.

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2.3 Period of Performance:

The anticipated period of performance is for delivery to the project site within 20 weeks from the date of the award.

3 Overall Objective(s) The BLM, Arcata Field Office (ARFO) is seeking one FRP bridge to be delivered as a customer installation kit to the project site approximately 5 miles east of Willits, CA. The objective of this work will include the creation of pre-engineered design drawings for, fabrication, and delivery of one structurally designed FRP pedestrian bridge. Final package should include deck materials and anchor bolts, with easy-to-follow instructions assemble at the project site using simple hand tools. Bridge abutment design, unloading and labor to install and construct bridge will be the sole responsibility of the BLM.

4 Specific Tasks This section defines the services required by this contract as four specific tasks:

1. Provide Pre-Engineered Design Drawings

2. Fabrication

3. Delivery

Task 1: Provide Pre-Engineered Design Drawings: Structural Diagrams, Shop Drawings, and Calculations of Prefab FRP Bridge

Structural designs, shop drawings, and calculations, including abutment requirements, of the bridge structure(s) shall be provided by or under the direct supervision of a Licensed Professional Engineer and done in accordance with recognized engineering practices and principles. The structural designs, drawings, and calculations of the prefab FRP bridge must meet the load conditions in EXHIBIT B: New Bridge Specifications.

Structural designs, drawings, and calculations shall be submitted to BLM for review and approval prior to fabrication. All calculations shall be signed and sealed by a licensed Professional Engineer.

Drawings shall include bridge layout, plan, profile, details, anchorage requirements, and detailed assembly drawings indicating weights, dimensions, connections, fasteners, and a list of materials included and not included with the shipment package

-See Delivery / Performance Schedule for deliverables- PRE AWARD: Error! Reference source not found.

POST AWARD: Deliverables

Task 2: Fabrication Contractor shall fabricate the bridge components according to the Pre-Engineered Design Drawings provided in Task 1 . Fabrication shall take place under the supervision

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Task 3: Delivery Contractor shall deliver the bridge components to the project site within 20 weeks from the date of award. See Delivery Schedule, Section 5.0 Delivery. Contractor shall coordinate with BLM such that BLM staff will meet the truck at the site upon the time of delivery.

DELIVERY ROUTE INSTRUCTIONS:

• If coming from US-101 N, driver will take Exit 568 for CA-20 toward Willits

• Turn left on CA-20 W into Willits and continue onto S Main St

• Turn right onto E Commercial St and -ZERO ODOMETER-

• Drive E Commercial St 1.5 mi

• At mile 1.5, continue onto Hearst Rd/Hearst Willits Rd

• Drive 3.4 mi and then turn left to stay on Hearst Rd/Hearst Willits Rd

• Continue onto Canyon Rd

• At mile 6.6 arrive at Delivery Location, the Little Darby Environmental Education Area, Figure 1.

• .5 mile east of Delivery Location is a good turnaround for large trucks/trailers, see Figure 2 and Figure 3.

Figure 1. Delivery Location at the Little Darby Environmental Education Area. 6406 Canyon Rd, Willits, CA 95490.

(39.437032°, -123.257711°)

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Figure 2. Delivery Location and truck turnaround at the Little Darby Environmental Education Area, 5 miles east of Willits, CA.

Figure 3. Turnaround where Canyon Rd meets Tomki Rd, 0.5 mi east of Delivery Location (Figure 1).

BLM staff will receive and offload components without the aid of heavy equipment.

Parking area is large enough for a 25 foot long flat bed and truck to pull through. A wide turnaround is located 0.5 mi east of the Delivery Location, see Figure 2 and Figure 3. The turnaround coordinates are (39.434590°, -123.245304°).

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5 Delivery / Performance Schedule

5.1 Deliverables

5.1.1 Provide Pre-Engineered Design Drawings: Structural Diagrams, Shop Drawings, and Calculations of Prefab FRP Bridge

A. Contractor shall provide finalized Pre-Engineered Design Drawings: Structural Diagrams, Shop Drawings, and Calculations of Prefabricated FRP Bridge with references for the superstructure, abutments, and anchor bolts. Structural calculations and drawings must be signed by a Professional Engineer.

B. BLM will approve shop drawings and calculations prior to fabrication.

C. Operation and maintenance manual, installation instructions and warranty documentation shall be sent to BLM POC.

5.1.2 Fabrication

Tolerances No material deviations beyond industry standards are accepted. All cut edges to be cleaned and sealed.

Railings A. Railings shall be a minimum of 54” above the floor deck.

B. Maximum opening between the mid-rails shall not be greater than 4” C. Toeplates shall be installed.

Finishing Bridge color shall be from manufacturer’s standard colors. Supply a color chart or list for BLM to choose.

Assembly Notes Manufacturer shall fabricate and mark all components for field assembly with appropriate part numbers that cross-reference the Assembly & Installation Instructions. No parts shall require any field cutting, drilling, or other field modification unless specified.

5.1.3 Delivery

Coordination A. Anticipated delivery time frame: within 20 weeks from the date of the award B. Coordinate with BLM for delivery.

C. Delivery Coordinates: 39.437032, -123.257711. Little Darby Environmental

Education Area located approximately 5 miles East of Willits, California, see EXHIBIT A: Delivery Site Map.

D. Manufacture shall provide 72 hour notice of delivery for the BLM to coordinate meeting the delivery driver on site.

E. Contact BLM staff to schedule delivery.:

• Technical Advisor N. Marty King (928) 864‐7407

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• Engineering Advisor Justin Shobe (707) 825-2347

Shipping/Assembly A. All hardware, decking, and bridge members shall be shipped together in one load.

B. No member to exceed 250 lbs.

C. Maximum length of the longest member shall be half of the full bridge span – no more than 25 feet in length.

D. All members and assembly hardware shall be shipped on skidded such that

BLM staff can unload assemble and install through manual labor and hand tools.

5.1.4 Warranty

The contractor will provide BLM the commercial standard warranty for the FRP equestrian/pedestrian bridge.

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6 Government-Furnished Property, Materials, Services General:

The Contractor shall furnish all personnel, materials, equipment, supplies, facilities, transportation, tools, materials, supervision, and other items and non-personal services necessary to perform the work tasks defined in this Statement of Work, aka the fabrication and pre-engineered designs, and delivery of the equestrian/pedestrian FRP bridge to the project site where BLM staff will assemble and install the bridge.

Equipment:

The Government shall not furnish additional equipment to assist the Contractor in meeting the requirement of this contract. Once the bridge hardware, decking, and members are delivered, BLM staff will assemble and install on BLM designed abutments.

Applicable Publications (Current Editions)

AASHTO LRFD Bridge Design Specifications, 10th Edition

AASHTO LRFD Guide Specifications for the Design of Pedestrian Bridges, 2nd Edition

ADA Standards for Accessible Design

2024 International Building Code (IBC) https://www.bing.com/ck/a?!&&p=0badda8043e43165310b3a6d7f22e173e558830d88f43b7f07f9895415501e8bJmltdHM9MTc0MTY1MTIwMA&ptn=3&ver=2&hsh=4&fclid=2ddc8862-6c66-6ab4-25ec-9c8b6d716b85&psq=AASHTO-+LRFD+%2c+C3.3&u=a1aHR0cHM6Ly9zdG9yZS50cmFuc3BvcnRhdGlvbi5vcmcvQ29tbW9uL0Rvd25sb2FkQ29udGVudEZpbGVzP2lkPTczNg&ntb=1 https://www.ada.gov/law-and-regs/design-standards/ https://codes.iccsafe.org/content/IBC2024P1

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7 Security and Administrative Matters There are no additional security or administrative matters pertaining to this project. The bridge is intended for public equestrian/pedestrian use on non-restricted public lands.

Regular Work Hours:

The performance period established for this contract is based upon all work being conducted during regular working hours between 7:00am and 4:00pm, Monday through Friday, excluding government holidays. If the Contractor desires to carry on work outside regular hours, including Saturdays, Sundays, and government holidays, a request must be submitted to the Contracting Officer in sufficient time to allow satisfactory arrangements to be made for access to the work site.

Communications:

“Time” for communications received after 3:00pm, after 12:00 pm locally on Fridays, or after 12:00 pm locally prior to a holiday will not start until the next business day. All times are local Pacific Standard Time.

Federal Holidays:

The following Federal Legal Holidays are observed:

New Year’s Day Martin Luther King, Jr. Day President’s Day Memorial Day Independence Day Labor Day Columbus Day Veterans Day Thanksgiving Day Christmas Day

Fire Danger Season:

If the Contracting Officer Representative (COR) allows the Contractor to continue work during periods of declared fire danger or season, the Contractor shall comply with all applicable state laws relating to fire prevention and with all special conditions of work as directed by the COR.

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8 Technical Exhibits and Definitions

Standard Definitions:

Physical Condition The Physical appearance of Federal equipment or facilities that considers cracks, chips, dents, abrasions, rust, corrosion, general cleanliness, vibration, operating temperature, and discoloration and other items as identified by the COR. Physical condition may be determined by visual as well as diagnostic means.

Contracting Officer (CO) The Secretary of the Interior or designated authorized representative who is the only agent capable of signing a federal award or obligating funds.

Contracting Officer’s Representative (COR) The Contracting Officer’s designated representative as indicated in a delegation of authority letter.

Quality Assurance (QA) Surveillance of Contractor performance to determine performance requirements are met.

Quality Control Those actions taken by the Contractor to control the production of goods or services so that they meet the requirements of the Statement of Work.

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Technical Exhibits:

Attached are two Technical Exhibits:

• EXHIBIT A: Delivery Site Map This map shows the Project Location with the Delivery Site coordinates. The contractor will coordinate with BLM to deliver all hardware, decking, and bridge components on one truck no later than 20 weeks from the time of award. Delivery / Performance Schedule has photos and a detailed delivery route description.

• EXHIBIT B: New Bridge Specifications the Design specifications for the bridge to be fabrication and pre-engineered designs, and delivered by the contractor. All design drawings and calculations shall meet these requirements, and BLM shall be informed of any deviations per Delivery / Performance Schedule

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9 EXHIBIT A: Delivery Site Map

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10 EXHIBIT B: New Bridge Specifications

10.1 Bridge and Design Requirements

These specifications are for a fully engineered bridges of Fiber Reinforced Polymer (FRP) composite construction and shall be regarded as minimum standards for fabrication and pre-engineered designs. The manufacturer shall provide the bridge in kit form that is easily transportable, and easily assembled with ordinary hand tools. Manufacturer shall provide “Assembly and Installation Instructions” of the bridge components including, but not limited to, location, lengths, type and sizes of fasteners, clip angles, member sizes, and connection details. These instructions shall provide the customer with a step-by-step process for assembling and installing the complete bridge.

• Structural Design Requirements o Designed according to the AASHTO LRFD Guide Specifications for the

Design of Pedestrian Bridges o Live load 90 PSF o Punch shear resistance of decking: 1 kip per 4” x 4” x square o Snow load – Consult LRFD Ped design Guide / LRFD Bridge Design Guide o Wind load – Consult LRFD Ped design Guide / LRFD Bridge Design Guide o Exposure ‐ B o Seismic zone – D1

• The overall superstructure length for the bridge (span) shall be measured 50‐feet from each end of the bridge structure.

• Bridge deck width shall be 72" wide.

• Railing shall be a minimum of 54” above the deck surface. Railing shall conform to the International Building Code (IBC) and ADA Standards for Accessible Design.

• Bridge will be attached by BLM staff to government supplied abutments (*) that will be placed square, aligned, and at the same elevation on both ends.

• Bridge System Type: Bridges must be designed as a FRP Composite Truss or Girder Span.

• Member Components: All members shall be fabricated from FRP composite profiles and structural shapes as required.

• All members to be shipped shall not exceed 250 lb and the longest member shall not exceed 25 feet in span. This requirement is to make installation by BLM hand crew easier to accomplish.

*Abutments are provided and furnished by Government

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10.2 Equestrian Live Load Main Members

• Main supporting members shall be designed for an equestrian live load of 90 pounds per square foot (psf) of bridge walkway area. The punch shear resistance of the decking shall be 1 kip loaded on a 4” x 4” square.

• Deck dimensions shall be at least 2.5” deep for sawn lumber.

• Wearing surface shall be at least 2.5” deep for sawn lumber

10.3 Design Details

10.3.1 Serviceability Criteria

Service loads are used for the design of all structural members when addressing deflection and vibration issues. From the LRFD Ped Design Guide:

“Except as specified herein, the fundamental frequency in a vertical mode of the pedestrian bridge without live load shall be greater than 3.0 hertz (Hz) to avoid the first harmonic. In the lateral direction, the fundamental frequency of the pedestrian bridge shall be greater than 1.3 Hz.”

Criteria to be used by the contractor in the fabrication and pre-engineered designs of the FRP equestrian/pedestrian bridge are as follows:

Deflection:

Live Load (LL) deflection = L/360

Vibration:

Vertical Frequency (fn) = 5.0 Hz

The fundamental frequency of the equestrian/pedestrian bridge (in the vertical direction) without live load should be greater than 5.0 hertz (Hz) to avoid any issues with the first and second harmonics.

Horizontal Frequency (fn) = 3.0 Hz

The fundamental frequency of the equestrian/pedestrian bridge (in the vertical direction) without live load should be greater than 3.0 hertz (Hz) to avoid any issues with the first and second harmonics.

10.3.2 Allowable Fatigue Stress

Standard fatigue provisions do not apply to FRP composite pedestrian bridge live load stresses as heavy pedestrian loads are infrequent and FRP composite pedestrian bridge fabrication is generally governed by deflection criteria. Wind load concerns are also governed by deflection criteria.

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10.3.3 Minimum Thickness of FRP

Minimum thickness of closed structural tubular members shall be 0.25 inch. Minimum thickness of open structural FRP members shall be 0.375 inch. Plate connections also require a minimum thickness of 0.375 inch.

10.3.4 Connections

Under this specification, bolted connections shall be used for all main and secondary members. Use stainless‐steel bolts. Adhesive bonding can be used in conjunction with bolted connections for all main members and secondary members. Non‐structural members (i.e. railing rails) can be either bolted/screwed or adhesively bonded.

10.3.5 Seismic Loads

Seismic loads shall be determined according to the criteria specified in the standard building codes (IBC 2006, ASCE 7-05).

10.3.6 Engineering

Structural design of the bridge structure(s) shall be performed by or under the direct supervision of a Licensed Professional Engineer and done in accordance with recognized engineering practices and principles.

Engineered drawings delivered by the contractor shall be stamped by the supervising PE (under Task Error! Reference source not found.:Shop Drawings and Calculations).

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10.4 Materials

A. FRP Composites

FRP bridges shall be fabricated from high‐strength E‐glass and isophthalic polyester resin or high durability vinyl ester resin in the pultruded FRP.

Weathering and ultraviolet light protection shall be provided by addition of a veil to the laminate construction.

The minimum thickness of FRP Composite shapes shall be as follows unless otherwise specified:

Bridge Component Minimum Thickness Closed structural tubular members 0.25 inch Open structural FRP members 0.375 inch Plate connections 0.375 inch

B. Decking

Acceptable materials of wood decking are treated No. 2 Southern Yellow Pine or Douglas Fir 3‐inch x 12 inch planks. Pressure treated is not viable. Selection of decking must meet structural requirements defined in Error! Reference source not found..

C. Hardware

Bolted connections shall be A307 hot‐dipped galvanized steel or better. Contractor shall give BLM a selection of hardware types appropriate to optimum weathering characteristics for the environmental conditions in Willits, CA. Mounting devices shall be galvanized or stainless steel. Galvanized and stainless hardware shall not be in contact to avoid galvanic deterioration.

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