SUF FR912 Little Isabella River Culvert Replacement

SUPERIOR NATIONAL FOREST FR 912 MP 0.101 LITTLE ISABELLA RIVER CULVERT REPLACEMENT Project Statement of Work (SOW) US Department of Agriculture (USDA) Contents Project 3 General Information 3 1.0 Scope of Work 3 2.0 Background 3 Contractor Requirements 4 3.0 Technical Requirements / Tasks 4 4.0 Government Furnished 6 5.0 Deliverables / Schedule 6 6.0 Travel 7 7.0 Contractor’s Key Personnel 7 8.0 Security Requirements 7 9.0 Data Rights 7 10.0 Section 508 – Electronic and Information Technology Standards 7 Project FR912@ MP 0.101 Little Isabella River Culvert Replacement General Information 1.0 Scope of Work The intent of this contract is to provide for the replacement of the Little Isabella River Culverts on low volume Forest Road 912; traffic control monitoring, removal of timber panel bridging, demolition and removal existing culverts, furnish and install new precast concrete culverts, head walls and wing walls; furnish and install rip rap, backfill and geotextile drainage material; furnish and place aggregate to final road grade; install permanent bridge signs; seed and mulch all disturbed areas; and protect the Little Isabella River and associated wetlands from siltation and other destructive impacts of construction. The Contractor shall furnish all labor, materials, equipment, tools, transportation, and supplies necessary to meet the intent of this contract; and shall perform all work in close conformity with the drawings and specifications, and in accordance with the provisions of the contract. The CO must approve any deviation in the specifications or drawings. ** The Little Isabella River is a designated trout stream. All in-stream work must be performed between June 30th and September 15th. ** 2.0 Background The existing Little Isabella River Culverts are a triple 72” wide x 48” high x 32’-0” long corrugated metal pipe arch culverts constructed in 1975. The existing culverts are spanned with timber panel bridging laid over the top of the culverts due to concerns about the integrity of the culverts. The coordinates for the bridge are 47.64611 N, - 91.418333 W. The timber panel bridging shall be preserved and returned to the Forest Service. Existing Culverts The new precast concrete box culverts will be two 24’-0” long x 12’-0” wide x 5’-0” high side by side. There will be two 1’-5” wide x 9” high x 14’-0” long precast concrete headwalls at the upstream and downstream faces of the precast culverts. There will be two precast concrete wing walls upstream and downstream at the culverts. Contractor Requirements 3.0 Technical Requirements / Tasks All materials and workmanship shall be in accordance with the FHWA Standard Specifications for Construction of Roads and Bridges on Federal Highway Projects, FP-14, published by the United States Department of Transportation, Federal Highway Administration. All project specifications shall follow the specification summary listed in the USFS Forest Road 912-MP 0.101 Little Isabella River Culvert drawing package signed on 09/06/2023, FHWA Standard Specifications for Construction of Roads and Bridges on Federal Highway Projects, FP-14, and the project supplemental specifications. The contractor shall field verify the dimensions of all components before ordering materials. The Contracting Officer’s Representative (COR) shall be notified of any observed differences from the dimensions given in the SOW or drawings or any observed omissions. The contractor shall submit the order (box culvert, wing walls, and head walls) (documentation, drawings, design documentation, etc.) from the culvert material vendor to the COR for review prior to proceeding with fabrication. The contractor shall establish traffic control before commencing with any work on the culverts. The contractor shall construct two 24’-0” long x 12’-0” wide x 5’-0” high side by side precast concrete culverts. The culverts shall be designed to AASHTO LRFD Bridge Design Specifications, 9th edition, 2020, AASHTO Guidelines for Geometric Design of Low-Volume Roads, 2nd edition 2019, and FSH 7709.56b Transportation Structures Handbook, USDA Forest Service. The structure shall be designed for HL93 vehicles. The design load shall accommodate concurrently Minnesota Statute 169.826 Gross Weight Seasonal Increases and 169.8261 Forest Products Special Permit. The structure shall have an operating load rating for all Minnesota standard permit vehicles greater than or equal to 1.0. The load rating shall be in accordance with The Manual for Bridge Evaluation, latest edition by AASHTO. The load rating report shall be a submittal item. A sample load rating summary table for the vehicles to be included in the load rating report is shown below. The maximum foundation pressure is calculated to be 588 psf for service limit state and 917 psf for strength limit state, based on gross width of the box. All reinforcing steel shall be in accordance with ASTM A615, grade 60 (Fy=60,000 psi). All welded wire reinforcement (W.W.R.) shall be in accordance with ASTM A1064 (Fy=70,000 psi). Galvanized inserts shall be galvanized per ASTM B633-SC4. Bolts, rods, washers, nuts shall be hot dip galvanized or electro-galvanized per ASTM B633-SC1. Any subsurface conditions or existing foundations encountered that are not represented on the plans or in the specifications shall be brought to the immediate attention of the engineer for the inspection and/or alternate foundation/footing design. Any subsurface conditions or existing foundations encountered that are not represented on the plans or in the specifications shall be brought to the immediate attention of the engineer for the inspection and/or an alternate foundation/footing design. Precast concrete box culvert design strength shall be f’c = 5,000 p.s.i. minimum. Precast concrete wingwall design strength shall be f’c = 4,000 p.s.i minimum. Concrete strength s…