1. Statement of Work - Revised.pdf

US Department of Agriculture (USDA)

Statement of Work - Revised

Contents Project General Information

1.0 Scope of Work

2.0 Background

3.0 Project Location

4.0 Description of Work

5.0 Schedule

Attachments

6.0 Frequently Asked Questions

Project Upper Silver Creek Trail Bridge Replacement

General Information

1.0 Scope of Work

This project encompasses replacement of a failed trail bridge. Project components include modifications and repairs to the existing abutments and design, fabrication, deliver, and installation of a new prefabricated steel truss trail bridge superstructure.

2.0 Background

The Upper Silver Creek Trail Bridge collapsed due to excessive snow loads in the spring of 2023. The timber bridge fell into the channel and caused minor damage to the concrete abutments. The Forest Service was able to secure Emergency Relief for Federally Owned Roads (ERFO) funding from the Federal Highway Administration to replace the bridge. It was determined that the cause of failure was an actual snow load that exceeded the design snow load of the previous bridge.

3.0 Project Location

This project is located within the Lake Alpine Recreation Area, Alpine County, California. From Hathaway Pines, California, travel northeast 33.3 miles on Highway 4 to Lake Alpine Recreation Area. The trail bridge location is near the inlet to Lake Alpine, between the Chickaree Day Use Area and Pine Marten Campground. The latitude and longitude of the trail bridge is 38.481713, -119.991025.

The site is accessible by an approximately 1.5-mile walk on asphalt and/or groomed cross-country ski terrain during the winter. The Forest Service acknowledges the necessity for verification of dimensions prior to the manufacturing of the bridge.

4.0 Description of Work

The following work shall be performed as mandatory work items under this contract. All work shall be completed in accordance with attached project specifications, drawings, and best management practices. The work includes all labor, material, and equipment necessary to perform all the operations required to complete the work specified.

The adjacent campground, day use area, and other areas will be open to the public during construction. The contractor shall be responsible for taking necessary precautions to protect public and private property during construction.

Mobilization:

Mobilization as necessary shall include preparatory work and operations necessary for the movement of personnel, equipment, supplies, and incidentals to the project site. Two potential staging areas have been identified near the project site. The contractor shall select which staging area they would like to utilize and submit a staging plan to the Forest Service. Potential staging areas are identified on the attached map. All staging and storage areas will be completely removed, and the areas restored to pre-construction conditions upon completion of use. Disposal of waste materials will be off National Forest land and in compliance with local, state, and federal laws regarding disposal of construction waste.

Prefabricated Bridge Superstructure:

The prefabricated weathering steel truss superstructure shall be designed, fabricated, delivered, and installed at the site. The prefabricated bridge shall meet the requirements of the specifications incorporated by reference and supplied as well as the specifications established in the drawings.

Minor Concrete:

This item includes necessary repairs to the existing concrete abutments, raising of concrete backwalls to match the new deck elevation, as well as supply and installation of epoxy set anchor all-thread and rebar as outlined in the project specifications and drawings.

Asphalt Concrete Path:

This item includes grading and resurfacing the existing asphalt path to match the grade of the new prefabricated bridge deck. The grade of the new asphalt path area shall not exceed 5% in the direction of travel and 2% cross slope. Asphalt concrete work shall be performed in compliance with FP-14 Sections 403 and 418.

The contractor is responsible for safeguarding employees, public, existing facilities, and forest resources from project operations. Signs and barricades as necessary shall be erected to make unguarded operations safe.

Permits:

The Contractor shall, without additional expense to the Government, be responsible for obtaining any necessary licenses, permits, and letters of certification. The Contractor shall comply with any applicable Federal, State, County, and Municipal laws, codes, and regulations in connection with the performance of the work specified under this contract.

5.0 Schedule

Lake Alpine Recreation Area has high visitor use and it is imperative that the project schedule provide maximum conflict reduction between project activities and use by the public. On-site work is not permitted between Memorial Day and Labor Day – no work on site except field verification of dimensions will be permitted prior to this date. Off-site work, such as design and fabrication of the bridge superstructure, can begin prior to this date (as soon as the NTP is issued).

Work hours shall be between 8AM and 5PM weekdays (non-holiday). No work shall occur at the project site on weekends or holidays without prior written approval.

Vehicle or equipment traffic in the streambed is not permitted while there is water present in the stream.

At the pre-work meeting, the contractor shall submit a proposed work schedule for the project to the Contracting Officer. The Contracting Officer shall be notified at least 48 hours in advance of any activity which requires inspection, acceptance, or approval. The contract shall update approved schedule as necessary when significant changes occur during the progress of work, or when requested by the Contracting Officer.

Attachments The following attachments are included or incorporated by reference:

- Project Plans (1 sheet)

- Specifications:

o AASHTO LRFD Bridge Design Specifications, Ninth Edition, 2020 o AASHTO LRFD Guide Specifications for Design of Pedestrian Bridges o Standard Specifications for Construction of Roads and Bridges on Federal Highway Projects, FP-14 o Forest Service Supplemental Specification Section 557 – Timber Structures

- Site Map

- Fire Plan

- National Best Management Practices for Water Quality Management on National Forest System Lands, dated

April 2012

6.0 Frequently Asked Questions

Below are several questions and answers regarding the project.

1. What are the site restrictions for heavy equipment? We would plan on using a 15,000 lb. telehandler to set the bridge, depending on final weight. Would this piece of equipment be allowed at this location?

Answer: Vehicles and transport of equipment to the project area are restricted to California highway legal loads. For oversize/ extralegal loads, the contractor may secure a permit from CalTrans for transport on Highway 4 and a permit from the Forest Service for transport on the small portion of Forest Service route to the project area if necessary. There is no formal restriction of equipment on site. The bridge is accessed by an approximately 5 ft wide trail but can also be accessed via overland travel on varying terrain, excepting the area identified on the site map. Site conditions such as trees and steep slopes may restrict equipment travel depending on the selected route of travel.

2. Can you clarify, the drawings in Document 3 show a weathering steel bridge. However, it’s a little confusing because in document 4, Supplemental Specs, the specifications are for a weathering steel bridge. Is the design supposed to be for a steel or wood bridge?

Answer: Assuming this question intends to ask that the Supplemental Specs are for Timber Structures. The supplemental specs apply to the timber utilized in the project – specifically the decking for the bridge as identified in the “TIMBER” portion of the “GENERAL NOTES” on the drawings. Otherwise, the bridge is to be a prefabricated steel truss superstructure.

3. Does the FS expect the height increase of the new backwall to add about 1’ to the existing backwall?

Answer: The final dimension will be determined by the truss fabricator. The FS anticipates this to be approximately 12” additional height.

4. Are there any extra requirements beyond those listed on the plans for bonding concrete and repairs to missing concrete? Is it of the consideration of the FS engineer that these edge repairs can be made to the existing abutments without any special measures beyond normal industry standard practice for patching concrete?

Answer: Follow requirements in FP-14, Section 601. Using Section 601.04, saw cut 1 inch deep around patch area, and remove loose concrete to a sound surface. Note 4% air-entrainment admixture required.

5. Is the contractor expected to have testing performed on the concrete that is to be used to raise the height of the backwalls of the abutments?

Answer: Yes. 2 test cylinders required.

6. Will mill certs be required for rebar used in construction?

Answer: Conform with Section 709.01,

7. Are there any recent pictures that would show the damage to the abutments as they look currently? Have these abutments been assessed by a structural or civil engineer or other competent person? If so, are there any assessments or reports as to the condition of these abutments?

Answer: No current photos or reports are available. Per drawing R-1750-01 General Note “CONSTRUCTION NOTES:”, “Contractor shall verify all as-built and field dimensions before start of work.”9. Is the government prepared to extend the timeline of the installation of the bridge if installation needs to be by helicopter and availability of heavy lift helicopters is limited by them being under contract for firefighting?

Answer: Helicopter placement is not required.

8. Is the government prepared to extend the timeline of the installation of the bridge if installation needs to be by helicopter and availability of heavy lift helicopters is limited by them being under contract for firefighting?

Answer: Helicopter placement is not required.

9. Will the FS have a COR onsite during construction activities?

Answer: A COR will be designated for the project and will conduct periodic site visits. Please note that the COR will not be present on-site during all operating hours.

10. Are there any limitations in regards to wildlife, endangered species, birds of prey etc. that are in effect during the period of project completion that could impact work activities of the contractor?

Answer: There will be no scheduled limitations on work in regard to wildlife species, however there may be short term restrictions if species of concern are seen within the project area. These restrictions would be minor and only required until the species has left the project area. Vehicle or equipment traffic in the streambed is not permitted while there is water present in the stream.

11. Approximately how far are the two staging areas, respectively, from the nearest abutment?

Answer: The staging areas at Chickaree Day Use Area is approximately 300’ from the bridge. The staging area at Pine Marten CG is approximately 100’ from the bridge.

12. What is the roadway width through the campground? We need to determine if we can get a truck with a 40’ bridge on it through the campground to the staging area.

Answer: Approximately 12 foot paved width. Google earth imagery is available for the area.

13. Can we use equipment on the trail to mobilize the bridge to the final location?

Answer: Yes. Any damage to the trail or trail surface caused by the Contractor’s work must be restored.

14. Is Onsite Camping Permitted?

Answer: Camping is not permitted. Should the contractor wish to utilize camping facilities, they may reserve and purchase sites through the campground concessionaire.

15. Can a crane be mobilized to the bridge site from the Pine Martin CG?

Answer: The contractor is responsible for evaluating access for the proposed equipment.

16. Is there enough room to drive a crane down the walking path from the Staging area 2 or will improvements need to be made and put back to the original condition?

Answer: The contractor is responsible for evaluating access for the proposed equipment.

17. Do you have pictures available?

Answer: See below

View from bridge towards Pine Marten Campground (staging area visible)

View from bridge towards Lake Alpine

View from Pine Marten Campground staging area