2. SOW.pdf

DESCRIPTION OF WORK

The objective of this contract is to perform maintenance and improvements on 13 bridges throughout Modoc National Forest. Work will include work on approaches (roadway, embankments, drainage features), channels, substructures (abutments, piers, etc.), superstructures (girders, diaphragms, end walls, bearing devices, etc.), decks (slab, curbs, etc.), wearing surfaces (running planks, etc.), and traffic safety features (bridge railings, approach railings, signing, etc.). Contractor shall furnish all labor, materials, equipment, mobilization, and other incidentals necessary to complete the specified work.

Unless otherwise noted or agreed upon, all bridges are expected to be in a condition consistent with the following listed requirements at the end of contract work. Contractors are strongly encouraged to visit each site before placing bids to develop a comprehensive work item list to meet requirements and specifications. Many bridges may not need any work to meet some of the requirements. Some specific work items for each bridge and relevant specifications are listed in the pages below. Note that the bridge work items tables contain a general list of notable predicted needs for each bridge and most relevant specification sections, however, this list does not constitute a comprehensive list of work to be performed as a part of this contract nor a comprehensive list of specification sections relevant to that work. Items listed in the tables below are required to be completed as well as any addition items to meet the following requirements.

Requirements:

1. Each bridge approach shall have appropriate drainage features directing water such that it exits the roadway prior to reaching the bridge. Drainage shall not be directed at bridge abutments. (See Rolling Dip Details, Page 2 of Drawings)

2. All approaches shall be paved (HMA: PG 64-28 binder w/ ½” minus aggregate; minimum 2-inch depth.) for a minimum distance of 50’. Pavement shall cover the entire width of the roadway. Abrupt edges on shoulders shall be minimized and aggregate shall be placed on shoulders as necessary to prevent abrupt drops. Transition from unpaved to paved shall be smooth. If necessary, aggregate shall be placed on unpaved portion of roadway prior to pavement to smooth transition. (See Surfacing Details, Page 3 of Drawings)

3. All approaches shall be cleared and brushed for a distance of 500 feet on each side of bridge. All conifers, hardwoods and brush within 4 feet of the roadbed shall be removed.

Branches on remaining conifers shall be trimmed from ground level to a minimum clearing height of 14 feet above the roadbed or to a limit of 60% of the tree’s height, whichever is less. Limbs of vegetation shall be cut to not protrude within the clearing limits. All trees and brush on bridge embankments shall be removed. (See Brushing & Clearing Details, Page 4 of Drawings)

4. All embankments shall be stable and all fill shall be repaired as necessary. Where erosion is occurring, riprap or other stabilization features shall be placed. (See Approach Embankment Details, Page 5 of Drawings)

5. All piers and abutments within the high-water line shall be protected with riprap. Class 5 riprap shall be used for piers and abutments that are likely to experience water contact on an annual basis. Class 4 riprap shall be used where contact with water is unlikely to occur.

(See Abutment and Pier Armoring Details, Page 6 of Drawings)

6. All concrete members shall be patched and repaired in all locations where scaling, spalling, delamination or other damage has occurred.

7. All bridge hardware (including running plates) shall be tightened and replaced as necessary. Loose or failed lag screws should be replaced with drilling and installing thru-bolts, nuts, and washers. Longer and/or thicker diameter lag screws and/or thru bolts with T-nuts to prevent loosening shall be used. When prepping/drilling/pre-drilling wood, apply copper naphthenate to newly exposed wood prior to hardware installation. Running plates shall be repaired and irreparable sections replaced.

8. All bridge members including surfaces, bearing devices and joints shall be clean and clear of bird nests, wasp nests, and other debris. All concrete decks shall have been mechanically swept and structures shall have been power washed. Wooden decks shall be manually swept.

9. Upon completion of work, all bridges shall have appropriate signage, including object markers and warning signage.

10. All hazard trees shall be removed from the channel. A hazard tree shall be considered any dead or dying tree within one and a half tree lengths of the bridge structure or any live tree within one tree-length of the structure. Trees to be felled shall be approved by FS representative prior to felling.

11. Option item: All bridges shall have guard rails, approach rails, and proper rail end treatments that meet current codes requirements unless otherwise specified Any features not replaced in-kind shall be designed and installed such that no additional dead load is added to bridge.

BRIDGE

NAME

COMPONENT

EXPECTED WORK ITEM DESCRIPTION

RELEVANT

SPECIFICATION

SECTIONS

PARKER CREEK,

SOUTH FORK

Approaches Repair approach embankment fill (Shoulder near downstream side of abutment 2 has some erosion)

Length:

78 Ft Material:

Approaches Pave bridge approaches 50’ on both approaches.

HMA: PG 64-28 binder w/ ½” minus aggregate;

minimum 2-inch depth.

Wooden With Approaches Repair potholes at approaches Steel Running Channel Clear hazard trees/snags Plates Structure Replace and tighten hardware Option: Traffic Safety

Features Upgrade/install railing end treatments to meet current code requirements

Parker Creek, South Fork

SPECIFICATION

SECTIONS

PARKER CREEK,

UPPER

Approaches Pave bridge approaches 50’ on both approaches.

HMA: PG 64-28 binder w/ ½” minus aggregate;

minimum 2-inch depth.

Length: Channel Remove hazard trees in channel upstream of bridge 36 Ft Material:

Channel Restore channel to center of abutments (Creek flowing adjacent to Abutment 1)

Drawings Pg 7

Wooden With Structure Place riprap (Class 4) around abutments 705 Steel Running Plates

Structure Clean wood-on-wood bearing locations to prevent moisture build up

Structure Replace and tighten hardware Option: Traffic

Safety Features Upgrade/install railing end treatments to meet

Parker Creek, Upper

SPECIFICATION

SECTIONS

HIGGINS FLAT

Length:

40 Ft

Approaches Repair and extend bridge approach pavement to 50’ on both approaches.

HMA: PG 64-28 binder w/ ½” minus aggregate;

minimum 2-inch depth.

402, 418

Material: Approaches Repair potholes forming at east edge of pavement Wooden With Channel Thin vegetation and trees in channel Steel Running Structure Clean expansion joints Structure Replace end deck beam on west edge at joint (6" x 8" x 15'8"), and first 3 damaged laminate deck boards Drawings Pg 8

Structure Replace NE wing wall cap beam Structure Replace and tighten hardware (Some nuts missing) Option: Traffic

Safety Features Upgrade/install railing end treatments to meet current code requirements, repair missing/cracked spacers and delineators along railing

Higgins Flat

SPECIFICATION

SECTIONS

JUNIPER CREEK Approaches Repair approach embankment fill 204

Length:

37 Ft Material:

Approaches Repair and extend bridge approach pavement to 50’ on both approaches.

HMA: PG 64-28 binder w/ ½” minus aggregate;

minimum 2-inch depth.

402, 418

Wooden With Steel Running Plates

Structure Replace and tighten hardware (Missing 1" nut and washer at Abutment 2 upstream wing wall, upstream column)

Option: Traffic Safety Features

Upgrade/install railing end treatments to meet

Juniper Creek

SPECIFICATION

SECTIONS

BARK SPRING Approaches Repair approach embankment fill 204 Approaches Brush and clear approaches 201 Length:

35.2 Ft

Material:

Approaches Pave bridge approaches 50’ on both approaches.

HMA: PG 64-28 binder w/ ½” minus aggregate;

minimum 2-inch depth.

Wooden With Steel Running

Channel Armor (Class 5 riprap) south abutment to shift channel back to center of span and eliminate scour pool

Plates Structure Clean expansion joints Structure Replace and tighten hardware Structure Clean structure of bird nests and other debris Option: Traffic

Safety Features Upgrade/install railing end treatments to meet current code requirements

Bark Spring

SPECIFICATION

SECTIONS

LOST RIVER Approaches Repair approach embankment fill and touch up approaches (Minor fill loss/erosion at NE abutment)

Length: Structure Patch/repair concrete on abutments 561 50 Ft Material:

Wooden With Steel Running

Structure Replace and tighten hardware (Some nuts missing on abutment, deck clamps to be tightened install nail near each clamp prior to tightening to eliminate spinning out of position)

Plates, Concrete Structure Clean bridge 563 & Steel Substructure

Traffic Safety Features

Replace load rating signs

Lost River

Note: Railings to meet code will not be a work item on this bridge.

SPECIFICATION

SECTIONS

LASSEN

CREEK

Approaches Repair potholes and install adequate drainage to prevent future potholes

Approaches Brush and clear approaches 201 Length:

30 Ft Material:

Concrete

Approaches Pave bridge approaches 50’ on both approaches (bridge is at intersection, pave both road approaches on both sides of bridge). HMA: PG 64-28 binder w/ ½” minus aggregate;

minimum 2-inch depth.

Channel Brush channel to prevent obstruction Structure Clean Deck Structure Patch/repair concrete in all locations where scaling, spalling, delamination, or other damage has occurred 552.19

Structure Clean (Substructure is moist and growing algae) Option: Traffic

Safety Features Upgrade/install railing end treatments to meet current code requirements, repair downstream vehicle damage on railing (downstream side of abutment 1)

Option: Traffic Safety Features

Install bridge approach rails to meet current code requirements

Lassen Creek

SPECIFICATION

SECTIONS

PIT RIVER,

SOUTH FORK

Length:

Approaches Repair approach embankment fill (Minor erosion off roadway at end walls is narrowing the roadway and backfill settlement is contributing to potholes at edge of deck)

42.2 Ft

Material:

Approaches Brush along shoulders and in channel adjacent to abutments

Concrete Approaches Pave bridge approaches 50’ on both approaches.

HMA: PG 64-28 binder w/ ½” minus aggregate;

minimum 2-inch depth.

Structure Clean deck, expansion joints and bearing devices Structure Patch/repair concrete in all locations where scaling, spalling, delamination, or other damage has occurred (deck, wing walls and curbs)

552.19

Structure Clean bridge 563 Option: Traffic

Safety Features Upgrade/install railing end treatments to meet

Pit River, South Fork

SPECIFICATION

SECTIONS

TURNER CREEK Approaches Repair and armor (Class 4 riprap) abutments/embankment 204, 705

Length:

98.5 Ft

Material:

Approaches Pave bridge approaches 50’ on both approaches.

HMA: PG 64-28 binder w/ ½” minus aggregate;

minimum 2-inch depth.

Concrete Structure Patch/repair concrete in all locations where scaling, spalling, delamination, or other damage has occurred

552.19

Option: Traffic Safety Features

Upgrade/install railing end treatments to meet

Turner Creek

SPECIFICATION

SECTIONS

ASH CREEK -

LOWER

Approaches Improve drainage on approaches, add rolling dip on south side

42 Ft Material:

Concrete

Approaches Repair asphalt and patch potholes at SW approach, Repair and extend bridge approach pavement to 50’ on both approaches.

HMA: PG 64-28 binder w/ ½” minus aggregate;

minimum 2-inch depth.

402, 418

Channel Restore channel (Thalweg has shifted near abutment 1 and stream water is in contact with the abutment)

Drawings Pg 7

Structure Patch/repair concrete in all locations where scaling, spalling, delamination, or other damage has occurred

552.19

Structure Armor abutments with riprap (Class 5) 705

Ash Creek - Lower

SPECIFICATION

SECTIONS

ASH CREEK -

UPPER

Approaches Brush and clear approaches 201

112 Ft

Approaches Pave bridge approaches 50’ on both approaches.

HMA: PG 64-28 binder w/ ½” minus aggregate; minimum 2-inch depth.

Material:

Concrete

Structure Patch/repair concrete in all locations where scaling, spalling, delamination, or other damage has occurred

552.19

Structure Armor piers with riprap (Class 5) 705 Option: Traffic

Safety Features Upgrade/install railing end treatments to meet current

Ash Creek - Upper

SPECIFICATION

SECTIONS

EAST CREEK

Length:

Approaches Clean and brush culvert under entrance to 38N23, improve drainage to prevent ditches from draining to abutments

75 ft Material:

Concrete

Approaches Pave bridge approaches 50’ on both approaches.

HMA: PG 64-28 binder w/ ½” minus aggregate; minimum 2-inch depth.

Channel Brush and clear near abutments and piers, clear aspens from under bridge at back wall

Structure Eliminate gaps between gabions and abutment back walls (fill with additional material to mitigate erosion and water/animal intrusion)

Structure Patch/repair concrete in all locations where scaling, spalling, delamination, or other damage has occurred

552.19

Option: Traffic Safety Features

Upgrade/install railing end treatments to meet current

East Creek

SPECIFICATION

SECTIONS

FOUR MILE

Length:

Approaches Pave bridge approaches 50’ on both approaches.

HMA: PG 64-28 binder w/ ½” minus aggregate;

minimum 2-inch depth.

102.5 Ft

Material:

Steel & Concrete

Structure Patch/repair concrete in all locations where scaling, spalling, delamination, or other damage has occurred

552.19

Structure Clean deck and steel members 563 Option: Traffic

Safety Features Upgrade/install railing end treatments to meet current code requirements

Option: Traffic Safety Features

Repair damage at rail connection near NW abutment

Four Mile

PROJECT LOCATIONS

The table and map below include general location information for all bridges within this contract.

A large georeferenced map with exact bridge locations is also attached.

BRIDGE NAME DISTRICT ROAD

NUMBER

ROAD NAME MILE

POINT

ASH CREEK - LOWER Big Valley 40N22 Hunters Ridge 20.81 ASH CREEK - UPPER Big Valley 39N50 Knox Flat 10.08 BARK SPRING Devils Garden 42N35 Hulbert 2.016 EAST CREEK Warner Mountain 39N01 South Warner 8.241 FOUR MILE Doublehead 48N70 Four Mile 5.862 HIGGINS FLAT Big Valley 41N11 Roney Flat 17.186 JUNIPER CREEK Big Valley 38N54 Cary Spring 6.4 LASSEN CREEK Warner Mountain 46N63 Plantation 0.0 LOST RIVER Doublehead 48N48 Lost River 3.23 PARKER CREEK, SOUTH FORK Warner Mountain 42N31 Deep Creek - Parker 17 PARKER CREEK, UPPER Warner Mountain 42N16 South Fork Parker 2.579 PIT RIVER, SOUTH FORK Warner Mountain 39N19 Old Blue Lake 0.15 TURNER CREEK Devils Garden 41N44 Pit River 0.0

SITE VISITS

All bidders are strongly encouraged to conduct site visits to all bridges prior to entering bids to best assess the nature and condition of the work necessary to fulfill contract obligations. All sites are accessible without prior approval or coordination; however accessibility may be dependent on weather conditions. Questions or requests for clarifications may be sent to Roxanne Reimer (Roxanne.reimer@usda.gov) or Chris Bielecki (Christopher.s.bielecki@usda.gov).

GOVERNMENT PROVIDED MATERIALS

Maps have been attached showing material sources on the forest. The contractor may choose to use these materials or may provide their own. Contractor shall coordinate with forest service staff prior to pulling materials from government-owned pits.

WILDLIFE CONSERVATION MEASURES

All bridge members including surfaces, bearing devices and joints shall be clean and clear of bird nests, wasp nests, and other debris. All previously painted members shall be repainted.

o Be sure to remove nests outside of the nesting period of March through September.

o Remove old nests and any traces of mud. Since old nests can be reused, remove any potential nests before the birds arrive from winter migration.

o Place physical barriers on potential nesting sites to prevent birds from nesting. You may use products such as coroplast, polytetrafluoroethylene (Teflon), Bird Slide™, plexiglass, plastic sheeting, or silicon-based paint coated to the surface. Physical barriers may be a permanent deterrent in preventing birds from nesting in nuisance locations. These barriers must be removed at completion of project.

Goshawk Conservation Measure: This measure applies to Ash Creek Lower, Ash Creek Upper, East Creek, Parker Creek and Lassen Creek Bridges. For these bridges, the work should be conducted outside of the nesting period. The nesting period is from April 1 to August 1.

Aquatic Species Conservation Measure: This measure applies to in-water work at Bark Springs, Ash Creek Upper, and Ash Creek Lower Bridges. Work needs to be completed during low water (August through October). Work area should be isolated to protect from debris and sediment entering the streamflow. Isolation can be accomplished by a block sein or sediment fencing.

Rock and gravel fill which is placed below the Ordinary High-Water line or as shoreline riprap should be clean and free of fines.

BOTANY MITIGATION MEASURES

Prior to arriving on each site, all contractor equipment and vehicles must be washed to ensure they are free of any weeds or other debris including invasive species (IS) propagules.

Prior to work on site, FS Botany personnel will flag occurrences of rhizomatous/sprouting IS, like CIAR4 and knapweed species, to prevent proliferation of subpopulations on site or spread between sites. Contractor shall avoid flagged locations.

OTHER REQUIREMENTS

Road closures: Generally, closures should be less than 4 hours to facilitate daily traffic. Longer closures can be coordinated with prior coordination with the Forest Service. The submitted work schedule (below) will be used by the Forest Service to provide public information and media releases prior to the beginning of the work.

Temporary Traffic Control: For public notification and safety, temporary signage and other measures as necessary shall be implemented at each work site in accordance with the current FHWA Manual on Uniform Traffic Control Devices.

SCHEDULE

Period of performance shall be 365 days from notice to proceed. Contractor is required to propose a detailed schedule of work to be approved by a Forest Service representative. Any changes to the approved schedule must be discussed and approved by representative.

SPECIFICATIONS

The Forest Service has adopted the FP-14 (https://highways.dot.gov/sites/fhwa.dot.gov/files/docs/federal-lands/specs/12851/fp14.pdf) for construction of National Forest System Roads and all relevant specifications from the FP-14 shall be met, excepting any changes as noted in the attached Forest Service Supplemental Specifications (FSSS, attached). The FSSS take precedence over the FP-14.