B08-Attachment_2-SOW_Messer_Pond_Road_Bridge_7041.pdf

STATEMENT OF WORK (SOW)

Katahdin Woods and Waters (KAWW) National Monument Replace Substandard Culverts and Bridges, Penobscot

County, Maine PMIS KAWW 314638C- Bridge Replacement E. Branch Penobscot Tributary at

Messer Pond Road T5-R8 WELS #7041

1.0 Background

Project is located in the National Park Service unit, Katahdin Woods and Waters National Monument (KAWW), located in Penobscot County of Northern Maine.

Katahdin Woods and Waters National Monument includes more than 80,000 acres and several hundred miles of aggregate-surface logging roads customary to the Maine Northern Woods. This contract will replace a undersized bridge system with an open channel system within KAWW to facilitate Atlantic Salmon passage.

2.0 Scope

This contract requires the contractor to provide all tools, labor, equipment, supervision, transportation and materials necessary to remove an existing bridge system. Work is to be done in accordance with all existing Federal, State and local codes.

The proposed bridge will have a clear span of 30 feet and an open area (capacity) of about 76 square feet, as compared with the current culvert with only 22 square feet. The abutments of the proposed bridge will consist of two courses of 2' high concrete blocks.

The deck will consist of 30' steel I-beams of appropriate webbing to support expected loads, with a deck of anchored concrete panels covered with ≈4-6" of gravel fill. The bridge will contain banks inside that connect to and match existing stream banks, which will consist of 12" - 18" rock to protect the abutments and filled in with gravel with sufficient volume of fines to fill voids in the larger rock and create banks passable by terrestrial animals. To provide sufficient hydraulic capacity, the bridge deck will be set to provide a raised road elevation of 655', requiring 25 yards of gravel fill for a distance of approximately 25' on each side of the bridge.

3.0 Objectives

The objective of this contract is to fully restore a bridge system to full working order and to facilitate Atlantic Salmon fish passage within KAWW.

4.0 Tasks

Tasks include:

• Remove one bridge system 16 ft. in length and two double tiers of waste blocks.

• Install a new open channel bridge structure in place of the current bridge system.

Repair / Replace Bridge: Bridge is on the Messer Pond Road four miles from HWY 159 at Matagamon T5-R8 WELS in Penobscot County – See Attachment 1, Location Map and Specifications.

1. Bridge - Repair and replace road bridge work includes, but is not limited to, removal of damaged concrete substructures, fabrication of replacement concrete substructures, layout, inlet/outlet dissipation, headwalls, tail walls, and re-construction of existing open channel concrete substructures, stream simulation, gravel roadway reconstruction, and bridge approach work. Bridge repair and rehabilitation will support aquatic organism passage such that the bridge inlet and outlet will be approximately at the same level of the surrounding supported stream bed. Dewatering will be required.

2. Detailed information for the E. Branch Penobscot Tributary at Messer Pond

Road Replacement is attached. Attachment 1, Location Map and Specifications, includes a map of the project location, proposed crossing inlet elevations, a partial list of materials and information on water control.

3. Quote Item: Remove / Replace Road Bridge System with a larger open channel structure on the Messer Pond Road.

5.0 Delivery

• The Contractor shall provide all tools, labor, equipment, supervision, transportation, and materials necessary to repair the roads and bridge.

• All work to take place will be within Katahdin Woods and Waters National Monument (KAWW), located in Penobscot County of Northern Maine.

• The contractor will submit shop drawings for the pre-cast concrete bridge sections and the concrete blocks showing the required top groove, and how it fits together with the steel structure and concrete deck panels for approval. The bridge sections shall be rated at HS-25, capable of handling standard logging truck weights. The pre-cast concrete deck panels are available from suppliers but can be fabricated by winning bidder. All concrete shall be a minimum of a 6-bag mix and 3000 pounds per square inch strength. The haunch design for HS-25 loading will be designed and stamped by a structural engineer and shall show all reinforcing steel placement.

• Gravel will be crushed to between 0.75 inch and 1.5-inch minus and be well graded so that it can be compacted into a stable road base. No gravel is available on site. Submit gradation analysis.

• The Contractor shall submit a safety plan to the Contracting Officer prior to performing any work under this contract.

• The Contractor shall submit a work schedule and sequence of events to the Contracting Officer prior to performing any work under this contract. There will be a pre-construction meeting held prior to the start of work on-site.

• The contractor shall submit a plan for traffic control or for any road closures. All signs and traffic control shall be the contractor’s responsibility. A total road closure for 72 hours will be allowed.

Contractor must give 48 hours prior notice for the closure.

• The contractor will submit a dewatering and watercourse management plan for the bridge work.

• A final inspection must be held with the government upon completion of the work.

• All vehicles and equipment shall be cleaned of any dirt or vegetation, particularly on the undercarriage, tracks, and sprockets before coming to the jobsite.

6.0 Government-Furnished Property

The Government will not be furnishing nor providing any property to the contractor for this contract. Excess excavated material due to the bridge replacement can be deposited within 4 miles of the project. Offsite disposal of the old bridge components and appurtenances will be the contractor’s responsibility.

7.0 Security

Contractor shall be responsible for securing the work site, materials, equipment, and tools during the duration of the contract. If a temporary staging area is required, KAWW may identify and agree to a location with KAWW. The Government will take no responsibility for lost, stolen or damaged property as a result.

8.0 Place of Performance

The contract work shall be performed on the Messer Pond Road within Katahdin Woods and Waters National Monument (KAWW), located in Penobscot County, Maine.

9.0 Period of Performance

The onsite work can only be done between the 15th of July and the 30th of September in any calendar year. The period of performance for this contract begins with a notice to proceed and shall end on 30 September 2024. Period of performance shall be extended into 2025 if time of award is later than August 15th, 2024.

Submittals identified in Section 5.0 shall be provided to the Government within 14 days of award of this contract for review and approval. It is anticipated that the Government will require a minimum of 5 business days to review the submission.

Once the submittals are approved by the NPS, the contractor shall commence work, completing it within the period of performance specified above.

Attachment 1

Crossings #7041, 7042

Messer Pond Bridge Projects #7041, 7042.

National Park Service, © Mapbox, and © OpenStreetMap

1/31/2024 0 2.5 51.25 mi

0 4 82 km

1:210,894

#7041, 7042

Messer Pond Bridge Replacement 7041 and 7042

NPS

1/31/2024 0 1 20.5 mi

0 2 41 km

1:105,447

Site Map - Drainage Area

Site Photos

Inlet Outlet

Upstream Downstream

Site Topography - Existing Conditions

Stream Restorati

Note: Water indicated here along stream channels though they are dry ≈ 90% of the year.

Stream Profile - Existing Conditions

Note: This view is vertically exaggerated, reflecting the different scales of units for elevation and distance.

Road Existing bridge deck structure

& footings

Scour through undersized bridge opening

Wood

XS1

Cross-Section 1 - Reference Reach Upstream of Crossing

Upstream to Cross-Section Downstream to Cross-Section

Bankfull Width = 23.5'

Bankfull XS Area ≈ 35 ft2

Site Topography - Proposed Conditions

Note: Water indicated here along stream channels though they are dry ≈ 90% of the year.

Stream Profile - Proposed Conditions

Note: This view is vertically exaggerated, reflecting the different scales of units for elevation and distance.

Road

Proposed 30' clear span x 16' wide x 2' high

Bridge deck assembly on precast concrete abutments

Existing Stream Bed

Expected Stream Bed

Added fill to increase road elevation by 1'

Proposed Bridge - Inlet Elevation

* Low wood or concrete curbing recommended to retain gravel over top of bridge deck panels

Existing ≈ 11.5' x 3'

Opening 22 ft2

Road Surface at ≈655' Elevation - Raised 1' over existing

2' x 2' Blocks of varied lengths

Estimated Capacity 76 ft2

Clear Span = 30.0'

1% Probability Flow

Steel I-Beam Deck Superstructure 34' L x 14' W x 1' H

Concrete Deck Sections*End Dams

HW Ratio ≈ 0.6

Beam Seats

Bottom of Abutment

Blocks 648.5'

Proposed Bridge and Abutment Profile

Bed and Bank Schematic:

Inlet Elevation

650'

Outlet Elevation

649.5'

Bottom of Excavation 648'

Bridge/Road Width = 16' Abutments = 18-20'

2' x 2' x 10' Block

2' x 2' x 6' Block

Curb

Banklines are composed of 12-18 inch (average intermediate dimension – not longest or shortest measure) competent, angular to sub-angular foundation rock. Banklines must connect to the natural stream banks at all four corners to improve scour protection and terrestrial organism passage. Additional smaller rock and fines are also necessary for filling gaps in the larger material to provde more stable banklines. Fines should be watered into bank foundation rock to fill voids.

Banks must connect to natural banks at all four corners to provide for terrestrial animal passage with voids filled with fine material.

Flow

Plan View

2' x 2' x 10' Block

2' x 2' x 6' Block2' x 2' x 6' Block

Concrete Deck Panels

Steel Superstructure

Beam Seat

End Dams Block Sediment

Rock Embankment Armor to be placed at all corners, but not blocking stream banks

Hydrology & Hydraulic Analysis

HY-8 Hydraulic Analysis Program of the U.S. Federal Highway Administration provides results for the above peak flow estimates for the proposed crossing design, and indicates that the crossing as proposed will successfully pass the expected 1% probability storm event.

Discharge Names

Culvert Discharge

(cfs)

Headwater Elevation

(ft)

Flow Type

Outlet Depth (ft)

Outlet Velocity

(ft/s) 99 82.00 650.98 1-S2n 0.69 5.78 50 96.00 651.07 1-S2n 0.75 6.13

20 119.00 651.22 1-S2n 0.85 6.57 10 139.00 651.34 1-S2n 0.93 6.92

4 165.00 651.49 1-S2n 1.03 7.34 2 185.00 651.61 1-S2n 1.10 7.62

1 206.00 651.74 1-S2n 1.17 7.87

0.2 263.00 652.07 1-S2n 1.37 8.35

Attribute Value Units Definition References:

Drainage Area 0.26 sq. miles Area that drains to crossing 99 82

Wetlands 1.5 percent Percentage of NWI storage 50 96

Elevation 790 feet Mean bason elevation 20 119

Precipitation 50 inches Mean annual precipitation 10 139

Aquifer Unknown percent 4 165

2 185

X-coordinate 51438 State Plane m Basin centroid E/W location 1 206

Y-coordinate 5102972 State Plane m Basin centroid N/S location 0.2 263

Return

Probability (%)

Peak QT

(ft3/s)1

1 Lombard, P.J., and Hodgkins, G.A.,2020, Estimating flood magnitude and frequency ongaged and ungaged streams in Maine: U.S. Geological Survey Scientific

InvestigationsReport 2020–5092, 56 p.

(https://doi.org/10.3133/sir20205092)Percentage of land underlain by sand & gravel aquifers

Water Control:

Material Specifications:

It is critical that water be controlled during construction, maintaining stream flow, and eliminating potential sedimentation and erosion, though in the case of this crossing, water apparently flows a very limited amount of time throughout the year. All Maine Department of Environmental Protection Best Management Practices for Sediment and

Erosion Control should be followed, particularly in case of unexpected stream flow. Sandbag or other cofferdams should be ready to be placed to control stream flow to isolate the work area and maintain water quality during construction while allowing pumping of clean stream water around the site. Abutments can be excavated and installed while the site is isolated, with dirty water from the work zone pumped out and filtered in nearby forest to avoid contamination of the stream. Sufficient pump capacity is essential to maintain water control, with backup pumps on hand or readily available.

30' Span Bridge: Must meet HS-25 load rating or better Deck Structure: Abutment Blocks:

34' L x 14' W Steel I-Beam Superstructure Straight: 4 @ 2' H x 2' W x 10' L 6 @ 2' H x 2' W x 6' ≈ 16' L x 4' W concrete deck sections (total 34' x 16' area) ≈ 16' L x 2' W x 3" thick concrete end dams Appropriate Beam Seats on which to lay steel superstructure (≈ 16' L x 2' W x 6")

Abutment Bed: 4 yds 3/4" crushed stone

Rock for bank and embankment scour protection: 20 yds @ 12-18" & 4 yds 6"-minus gravel

Road Fill to raise bridge elevation 1' (4-6" over deck) 25 yards

Sandbags for Cofferdams: 50 small (60 lb.) - as needed depending on stream flow

Polyethylene Sheeting (6 mil - for cofferdam sealing as needed) ) 400 sq. ft

Pump conveys streamflow during construction

Removal of existing culvert Dirty water pumped from work site Dirty water filtered in nearby forest

Water Control: Cofferdam, Pump & Filtration Placement

Cofferdams

Dirty Water Pump

Clean Water Pump

Cofferdams

Filtration Area

Clean Water Pump

Note: Water indicated here along stream channels though they are dry ≈ 90% of the year.

As such, many of the indicated water control elements may not be required.