B08-Attachment_5-SOW_Raggid_Brook_4447.pdf

STATEMENT OF WORK (SOW)

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

County, Maine PMIS KAWW 314638C- Bridge Restoration Raggid Brook at Grondin Road T5-R7

WELS #7447

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 repair a bridge system with another open channel bridge system within KAWW to facilitate Atlantic Salmon passage. Crossing #7447 consists of an existing substantial bridge which is being undermined at its abutments and presenting a potential barrier to aquatic organism passage to the headwaters of Raggid Brook.

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 rebuilt bridge will use the existing steel superstructure and will have a clear span of

19 feet and an open area (capacity) of about 120 square feet, as compared with the current bridge with only 84 square feet. The abutments of the proposed bridge will consist of four courses of 2' high concrete blocks. The deck will consist of the existing

24' steel I-beams modified to ensure appropriate diaphragms to support expected loads, with a deck of anchored concrete panels covered with 4-6" of gravel fill. This structure will replace the current combination of two bridge decks, and so will allow a slight lowering of the road elevation by 6". 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. All four corners of the bridge abutments and embankments will be armored with the same size rock to protect against erosion where greater than 2:1 slope are required.

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 24 ft. in length and two sections of 3-tiered waste block abutments.

• Install rebuilt open channel bridge structure using existing steel superstructure with modifications in place of the current bridge system.

Repair / Replace Bridge: Bridge is on the Grondin Road three miles from HWY 159 in Mt. Chase T5-R7 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 Ragged Brook Bridge on Grondin Road Restoration project 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/Restore Road Bridge System with a larger open channel structure on the Grondin 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, steel structure, and the concrete blocks. 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 concrete deck panels and steel structure 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 culvert 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 Grondin 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

Dav is Pond

Gardner Pond

Lower Shin PondD a v i s

R i d g e

1270 ft

Seboeis River

Peaked Mountain

Pond

Twin Ponds

B e a r M o u n t a i n

P e a k e d Mo u n t a i n

Houston Brook M ill Brook

Sarg e nt Brook

Ackley Pond

Wa r d sw o r t h M o u n t a i n

A l l e n H i l l

W ebster

Brook

Crysta l Brook

Bragg Brook

Peasley Brook

Rowe Brook

W ebb

Brook

W illett Brook

Wiley Pond

N or th R d

Patten

K i mb a l l H i l l

#7447

Raggid Brook Bridge on Grondin Road #7447

Province of New Brunswick, Esri Canada, Esri, TomTom, Garmin, SafeGraph, GeoTechnologies, Inc, METI/NASA, USGS, EPA, NPS, USDA, USFWS, 1/31/2024 0 1 20.5 mi

0 2 41 km

1:105,447

Buc ks Trl

G rondin

Rd

1068 ft

Ra gg ed

Br oo k

Sucker Brook

Twin Ponds

G ro n d in

Rd

A l l e n H i l l

1113 ft

Crystal Brook

Peasley Brook

Stone Rd

Owlsboro Rd

Grondin Rd

Shin Pond

Rd

#7447

Raggid Brook Bridge on Grondin Road, #7447

Province of New Brunswick, Esri Canada, Esri, TomTom, Garmin, SafeGraph, GeoTechnologies, Inc, METI/NASA, USGS, EPA, NPS, USDA, USFWS, 1/31/2024 0 0.6 1.20.3 mi

0 1 20.5 km

1:52,723

Site Map - Drainage Area

Site Photos

Inlet Outlet

Upstream Downstream

Failing Left/East Abtument

Site Topography - Existing Conditions

Stream Profile - Existing Conditions

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

Road

Existing Portable Bridge Deck over older bridge deck structure

& failing block abutmements

Wood

XS1

Cross-Section 1 - Reference Reach Downstream of Crossing

Upstream to Cross-Section Downstream to Cross-Section

Bankfull Width ≈ 14'

Bankfull XS Area ≈ 25 ft2

Bedrock

Site Topography - Proposed Conditions

Stream Profile - Proposed Conditions

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

Road

Overall Slope = 0.25%

Maximum Expected Scour

Proposed 19' clear span x 16' wide x 3' high

Bridge deck assembly on 9' high precast concrete abutments

Existing Stream Bed

Expected Stream Bed

Agraded Area to be lowered ≈ 6"

Proposed Bridge - Inlet Elevation

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

Road Surface at ≈716.5' Elevation

2' x 2' Blocks of varied lengths

Estimated Capacity 120 ft2

Clear Span = 19.0'

1% Probability Flow

Steel I-Beam Deck Superstructure ≈ 23' L x 14' W x 2' H

Concrete Deck Sections*

End Dams

HW Ratio ≈ 0.64

Beam Seats

Existing ≈ 18' x 6'

Opening 84 ft2

Bottom of Abutment

Blocks 704.5'

L-Blocks tie abutment back into fill

Embankment Armoring

Proposed Bridge and Abutment Profile

Bed and Bank Schematic:

Inlet Elevation

706.5'

Outlet Elevation

706.4'

Bottom of Excavation 704'

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

2' x 2' x 6' x 6' L-Block

Curb

Banklines are composed of 12-24 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 6' x 6' L-Block

2' x 2' x 6' Block

Concrete Deck Panels

Steel Superstructure 14' W

Beam Seat

End Dams Block Sediment (≈ 16' x 2.5' x 3")

2' x 2' x 6' x 6' L-Block

2' x 2' x 6' x 6' L-Block

2' x 2' x 8' Block

2' x 2' x 10' Block 2' x 2' x 10' Block

2' x 2' x 6' x 6' L-Block

2' x 2' x 6' x 6' L-Block2' x 2' x 7' Block

Stream Bank Elevation *

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.

Attribute Value Units Definition References:

Drainage Area 1.51 sq. miles Area that drains to crossing 99 75

Wetlands 4.8 percent Percentage of NWI storage 50 97

Elevation 854 feet Mean basin elevation 20 156

Precipitation 40.2 inches Mean annual precipitation 10 200

Aquifer Unknown percent 4 261

2 310

X-coordinate 531960 State Plane m Basin centroid E/W location 1 361

Y-coordinate 5101427 State Plane m Basin centroid N/S location 0.2 482

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

Discharge Names

Total Discharge

(cfs)

Headwater Elevation

(ft)

Flow Type

Outlet Depth

(ft)

Outlet Velocity

(ft/s) 99 75.00 708.35 2-M2c 1.14 5.51

50 97.00 708.64 2-M2c 1.32 5.95

20 156.00 709.29 2-M2c 1.75 6.84

10 200.00 709.69 2-M2c 2.09 6.97

4 261.00 710.19 2-M2c 2.38 7.62

2 310.00 710.56 2-M2c 2.60 8.07

1 361.00 710.93 2-M2c 2.82 8.49

0.2 482.00 711.74 3-M2t 3.33 9.24

Water Control:

Material Specifications:

It is critical that water be controlled during construction, maintaining stream flow, and eliminating potential sedimentation and erosion, which is particularly important at this site because of the amount of water involved at the site. 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 placed upstream and downstream 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.

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

≈ 23' L x 14' W Steel I-Beam Superstructure (using existing steel) 4 @ 2' H x 2' W x 10' L 2 @ 2' H x 2' W x 8' 2 @ 2' H x 2' W x 7' ≈ 16' L x 4' W concrete deck sections (total 24' x 16' area) 2 @ 2' H x 2' W x 6' L 12 @ 2' H x 2' W x 6' x 6' L-Block ≈ 16' L x 2.5' W x 3" thick concrete end dams Appropriate Beam Seats on which to lay steel superstructure (≈ 16' L x 2' W x 3")

Abutment Bed: 6 yds 3/4" crushed stone

Rock for bank and embankment scour protection: 30 yds @ 12-18" & 4 yds 6"-minus gravel

Sandbags for Cofferdams: 30 1-ton or steel plates to cover 50 linear feet with a maximum depth of > 3' (avg. depth 2') 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

Filtration Area

Block Net

Block Net

Filtration Basins

Install small pipe to protect clean water discharge hose