B08_Attachment_No__1__SOW_0003.pdf

Red Mountain Road Upgrade 2026 Statement of Work (SOW)

Bureau of Land Management (BLM) Arcata Field Office

Amended 04282026 with additional culvert materials Amended 05072026 with additional rock materials

1.0 Background

The Bureau of Land Management (BLM) Arcata Field office requires work that will entail repairs, upgrades and reconstruction of road drainage sites along 12 miles of Red Mountain Road, a rural dirt and aggregate-surfaced road in Mendocino County, California near the community of Piercy (Maps 1 and 2). The road provides access to both public and private lands. The work is being done to replace aging infrastructure (e.g., culverts), comply with Clean Water Act requirements for reducing road-related erosion, and enhance safe vehicular access along the road. Specific actions include culvert replacements, rolling dip construction, aggregate base installation, road reshaping, and rock armoring of vulnerable fill slopes.

The work will conform to various specifications and Best Management Practices:

(a) Typical diagrams describing the various treatment types are provided as

Appendix A of this Statement of Work (SOW).

(b) Best Management Practices for protection of water quality are provided in

Appendix B of this SOW.

2.0 Scope

Road upgrading work shall be implemented along 12 miles of Red Mountain Road. The road is a rural, dirt and aggregate-surfaced road in a steep, mountainous setting.

Specific treatment sites and materials quantities are listed in Tables 1 and 2, respectively. Broadly, the work includes:

• Site-specific upgrades at 12 sites along the road, treatments shall include:

o Culvert replacements o Installation of rocked drivable rolling dips and critical dips (see Appendix A for diagrams) o Rock armoring of culvert fill slopes and inlet areas o Installation of rock base material on delineated road segments.

• Two additional sites are provided as additive line items for potential additional work.

Contractor is responsible for preparing the roadway for equipment access. This includes road brushing and road smoothing. Existing drainage features such as rolling dips shall not be disturbed unless approved by the Contracting Officer’s Representative (COR).

Amendment No. 0003

Some rolling dips may be abrupt and require modification prior to dump truck transit.

Prior to the start of work, the BLM will stake and/or flag the individual treatment sites.

3.0 Objectives

The objectives of the project are to:

• Improve road surface drainage

• Replace aging and failing culverts with appropriately sized pipes

• Improve vehicle access conditions

• Reduce road-related sediment delivery to watercourses.

4.0 Requirements

The Contractor shall perform all site-specific treatments. The contractor shall be responsible for purchasing and providing all materials for the project, including necessary water for compaction. A limited quantity of rock is available at a small quarry site and is described in the Government Furnished Property section below and displayed in the attached Map 2.

Site Specific Treatments. The Contractor will implement specific treatments at 12 sites identified for upgrading. The Site-Specific Treatments Table 1 below provides the list of sites, treatments and the identified problem at the site as background.

Materials quantities for each site are listed in Table 2.

Installation methods and finished sites will conform to the typical drawings provided in Appendix A. Specific treatment types such as various rolling dip types, critical dips and culvert installations will adhere to the construction techniques provided in the typical drawings in this SOW. These include such measures as soils compaction, finished grades and mulching. The Contractor shall be responsible for reviewing and familiarizing themselves with the required treatment designs. Best Management Practices (BMP) for water quality protection are provided as Appendix B and are to be implemented in the appropriate circumstances as described for the specific BMP.

Each treatment site has the following minimum requirements:

• Contractor shall use angular road base material on all road, dip and culvert installation surfaces. Quantities are specified Table 2.

• Contractor shall use Class II 1.5” angular road base for all rolling dip, critical dip road segments, and culvert installations. Class II base will conform with 2023 CalTrans Standard Specifications.

• Rock will be applied to cover the entire constructed length and width of the individual dips.

• All rock will be compacted using a roller drum or other suitable compaction equipment. Tire-rolling of rock is not a suitable means of compaction.

• Approximately 3 tons of 3” angular ballast rock will be applied to the axis of each rolling dip. Critical dips do not require this. (EXHIBIT 3: PWA HANDBOOK

SPECIFICATIONS)

• Culverts shall be set into prepared native material free of visible organic debris and rock particles >3”. Compaction shall occur in a minimum of 6” lifts. Water used to achieve compaction shall be supplied by the contractor.

• Contractor shall provide sufficient water to achieve compaction at all treatment sites.

• Contractor will apply straw mulch over all disturbed ground within 100 feet of a watercourse.

• Contractor shall utilize Aluminized, Type 2 corrugated metal pipes for all culvert sites. All culverts 42" or smaller shall be 12 gauge aluminized corrugated metal pipe. All culverts 48" and larger shall be 10 gauge aluminized corrugated metal pipe.

• Replaced culverts shall be transported and disposed of legally offsite.

• Fill slope armoring will use 6” to 24” rip rap materials and be installed to a minimum depth of 18”.

• Rolling dip and Critical Dip installations shall conform to specifications provided in Appendix A with emphasis on finished grades that provide for access for a variety of long wheel-based vehicles. Extensive excavation into the subgrade is expected to achieve these finished grades. Finished grades include not only approaches but dip outslope grades. Where possible, contractor shall salvage existing rock for re-application on to finished surfaces. Contractor shall demonstrate finished grades to COR upon completion.

Water Diversion:

If water is still running in the streams at the time of construction, the contractor shall divert water around the work area and back into the stream prior to working in the stream channel. Provide temporary bypass piping and cofferdams at the inlet.

Site Specific Treatments Table Site # Treatment

1. Install critical dip on left side of #2 Xing.

2. Replace culvert (CMP) with 54" x 60' CMP set with outlet at the base of the outboard fill slope (OBF).

3. Apply 12 tons rock over culvert installation site.

24 1. Replace existing pipe with new 48" x 40'L CMP set with inlet set ~ 6' - 8' closer to road surface and outlet at base of OBF.

2. Armor the OBF with 30 tons of 0.5' x 2' rock.

3. Cut inboard ditch (IBD) ~8' to right – mulch

4. Install 3 rolling dips up the right road. Connect to IBD. (May only be able to dip outer 1/2 of the road because the road is so steep). (Note: Critical dip omitted due to steep road and large pipe and a critical dip at nearby Site #25).

5. Apply 12 tons rock over culvert installation site.

25 1. Replace existing pipe with new 24" x 50' CMP with outlet installed at the base of the OBF.

2. Reconstruct the critical dip to make less steep and ensure no diversion potential exists upon upgrading the crossing – apply 1.5” base rock through dip.

3. Apply 12 tons rock over culvert installation site.

26.1 1. Rip and reshape 300m road segment to promote better surface drainage via crowning and camber.

2. 2. Apply 100 tons of 1.5”- rock base to armor road running surface

29 1. Replace existing pipe with new 42" x 60' L CMP with outlet set at the base of the OBF. Road width may be reduced if needed for installation.

2. Install critical dip near left hinge of Site #28 to draw flow towards inlet side.

3. Armor headcuts above inlet with 10 tons of 1-2 ft diameter rock.

4. Armor headcuts below outlet with 10 tons of 1-2 ft diameter rock.

5. 5. Install 1 rolling dip up left road.

6. Apply 12 tons rock over culvert installation site.

33 Replace existing culvert with 36” x 40’ CMP

1. Apply 12 tons rock over culvert installation site.

34 1. Replace existing CMP with 54" x 40' CMP set with outlet placed at base of the OBF.

2. Armor OBF and inboard fill (IBF) with 18 tons of 1’ – 2’ dia. rock.

3. Ensure no diversion potential exists upon upgrade.

4. Apply 12 tons rock over culvert installation site.

Quarry site.

This is not a treatment site. Previously stockpiled rock here may be used for project.

There is approximately 40 tons of material available. Only existing stockpiled material may be used. No new excavation of the quarry is permitted.

Coordinates:

Latitude: 39.951746° Longitude: -123.648710°

Site # Treatment

70 1. Install 1 rolling dip ~ 60' left of DRC at gully

2. Install 40 tons of 0.5' - 2' diameter rock armor to the OBF below the rolling dip.

3. Install 1 rolling dip up the right road ~ 60’ past driveway.

4. Armor rolling dip with 20 tons of 0.5’ – 2’ diameter rock on OBF

5. Install 24”x 60’ CMP at base of OBF

6. Apply 18 tons rock over culvert installation site.

(spur 26)

1. Install 1.5” base rock 85’ through site at depth of 4” (16 tons)

2. Replace existing CMP with 48” x 50’ CMP (ensure >3” grade)

(spur 26)

1. Install two rolling dips on each side of valley segment

(spur 26)

1. Install 54” x 40’ CMP at site, re-align road, shape failed outslope fill prism

2. Place 33 tons 1.5” base rock through realigned site for 100’

(Spur

26)

1. Decommission upper crossing site to restore streamflow to natural channel.

Use spoils to fill diversion gully. Trackwalk to compact in 12” lifts. Provide for UTV access through site by laying back sidewalls to a minimum of 0.5x1.0.

2. Restore drainage through site, install 54”x50’ CMP, rock armor outfall with 8 tons 0.5’ – 2’ diameter rock, reshape outboard fill along 100’.

3. Install critical dip

4. Restore ditch and culvert to left of crossing by excavating inlet.

5. Armor decomm site with 24 tons of 3” rock

6. Apply 12 tons rock over culvert installation site.

ADDITIVE LINE ITEMS

30 1. Construct 3 rolling dips armored with 3” ballast rock and capped with the 1.5” base rock. This site requires an additional 15 tons of 3” ballast rock to secure subgrade in unstable terrain.

2. Install additional 60 tons of 1.5” base rock to secure site through 300 yards

77 1. Construct/reconstruct 2 rolling dips through site.

2. Install additional 60 tons of 1.5” base rock to secure site through 300 yards

3. Shape road prism to drain.

Table 2. Materials for site treatments.

Material Quantities Total (All Tasks) Volume

(CY)

Volume

(tons)

1.5" Base Rock 447 614 6”-24" Armor Rock 90 140 3" Ballast Rock for dips 42 40 24” CMP 12 gauge aluminized steel 130 feet 36” CMP 12 gauge aluminized steel 40 feet 42” CMP 12 gauge aluminized steel 60 feet 48” CMP 10 gauge aluminized steel 90 feet 54” CMP 10 gauge aluminized steel 190 feet

Treatment Site Location Dimensions Volume

(CY)

Volume

(tons)

Treatment Site 2 Replace culvert with 54” x 60’ -- -- Rock for critical dip (1.5” base rock) 120' x 12' x 0.3’ 21 32 Dip ballast rock (3”) 8’ x 12’ x 0.5’ 2 3 Culvert installation surfacing 40’x14’x0.5’ 7 12 Treatment Site 24 Replace culvert with 48” x 40’ -- -- OBF armor 0.5’ -1.5’ rock 20’ x 15’ x 1.5’ 20 30 Install 3 rolling dips up the right road

. (1.5” base rock) 120’ x 12’ x 0.4’ (x3) 21 (x3) 90 Dip ballast rock (3”) 8 x 12’ x 0.5’ (x3) 2 (x3) 9 Culvert installation surfacing 30’x’12’x0.5’ 7 12 Treatment Site 25 Replace culvert with 24” x 50’ -- -- Reconstruct/rock critical dip to broaden .

… (1.5” base rock) 60’ x 12’ x 0.5’ 13 20

Culvert installation surfacing 30’x’12’x0.5’ 7 12 Treatment Site 26.1 Apply 1.5” base rock over 300’ 300 x 12 x 0.5 67 100 Treatment Site 29 Replace culvert with 42” x 60’ -- -- Install Critical dip (1.5” base rock) 120' x 12' x 0.3’ 21 32 Armor headcuts above and below with

. 0.5’ -1.5’ rock 20’ x 6’ x 1.5’ (x2) 6 (x2) 20

1 rolling dip install (1.5” base rock) 120’ x 12’ x 0.4’ 21 32 Dip ballast rock (3”) 8 x 12’ x 0.5’ 2 3 Need to id spoils site for obf removal COR -- -- Culvert installation surfacing 30’x’12’x0.5’ 7 12 Treatment Site 33 Replace culvert with 36” x 30’ Culvert installation surfacing 30’x’12’x0.5’ 7 12 Treatment Site 34 Replace culvert with 54” x 40’ -- -- Armor OBF with 0.5’ -1.5’ rock 15’ x 10’ x 1.5’ 8 12 Armor IBF with 0.5’ -1.5’ rock 12’ x 6’ x 1.5’ 4 6 Culvert installation surfacing 30’x’12’x0.5’ 7 12 Treatment Site 70 Replace culvert with 24” x 80’ Install 2 rolling dips (1.5” base rock) 120’ x 12’ x 0.4’ (x2) 21 (x2) 60 Dip ballast rock (3”) 8 x 12’ x 0.5’ (x2) 2 (x2) 6 Obf armor below dips 0.5’ -1.5’ rock 12’ x 30’ x 1.5’ (x2) 20 (x2) 60 Culvert installation surfacing 40’x14’x0.5’ 10 18 Treatment Site 80 (spur 26) Replace culvert with 48” x 50’ -- -- Install 85’ of 1.5” Base rock 85’ x 12’ x 0.4’ 15 22 Treatment Site 81 (spur 26) Install 2 rolling dips (1.5” base rock) 120’ x 12’ x 0.4’ (x2) 21 (x2) 60 Dip ballast rock (3”) 8 x 12’ x 0.5’ (x2) 2 (x2) 6 Treatment Site 99 (spur 26) Replace culvert with 54” x 30’ -- -- Install 1.5” rock through site 100’ x 12’ x 0.5’ 22 33 Treatment Site 95 (spur 2) Replace culvert with 54” x 40’ Rock armor OBF 12’ x 8’ x 1.5 ‘ 5 8 Install critical dip (1.5” base rock) 120' x 12' x 0.3’ 21 32

ADDITIVE LINE ITEMS

Additive Site 30 Install 3 rolling dips through site 120’ x 12’ x 0.4’ (x3) 21(3) 90 Additional 3” ballast rock 15 Install additional 60 tons of base rock

. through site 60 Additive Site 77 Install 2 rolling dips through site 120’ x 12’ x 0.4’ (x2) 21 (x2) 60 Install additional 60 tons of base rock .

. through site 60

Environmental Controls. Federal and state permitting requirements have mandated project start and end dates from May 15 through October 15. The Best Management Practices (BMPs) listed in Appendix B are required to satisfy Clean Water Act requirements for Non-point source pollution. The presence of archaeological resources, sensitive soils and private lands within the project area requires that all vehicles and equipment operate on the existing roadway and up to 50 feet from the road centerline as required to complete work at designated sites. Only previously stock-piled and disturbed rock may be used with the quarry site (see Government Furnished Property Section below)

Site Use Plan. All vehicle and equipment use shall be restricted to the existing roadway.

Equipment work may occur within 50 feet of the road centerline if required for culvert replacements and rock installation. Equipment operations on areas beyond 50 feet require approval from the Contracting Officer (CO) or the COR. Existing pull-outs may be used for equipment staging and materials storage. Other sites may be utilized for staging, storage or disposal of excess soils subject to the Contracting Officer or the COR’s approval. The quarry site at milepost 11.4 may be utilized for materials storage and staging. At the conclusion of work, all storage and staging areas shall be restored to a free-draining condition and be free of any inorganic debris. All excess soils will be groomed to match existing topography as feasible. No hazardous materials or fuels shall be stored within 150 feet of a watercourse.

Traffic control. Contractor shall be responsible for maintaining traffic control at all treatment sites. Red Mountain Road is a low use rural road and does not require frequent traffic control.

However, infrequent residential and recreational access use does occur on the road. Roads should remain accessible during non-work periods using metal plates or other means when culvert installations are in progress. The contractor shall be responsible for notifying relevant road users of access status. Contacts will be provided by the COR.

Warranties. Any warranties provided by the contractor will be considered.

5.0 Delivery

The Contractor shall complete all treatments within 100 calendar days after notice to proceed.

Due to permitting requirements for the protection of water quality and federally listed species, all work must occur between May 15 and October 15.

Final Inspection and Acceptance. The COR will review all work. At the conclusion of the work, the CO, or their representative, will inspect all sites for conformance with the specifications and requirements. Any deficiencies noted during the inspection will be corrected prior to release of final payment. Prior to final payment the Contractor will have properly disposed of all waste materials including culverts, completed site mulching and grooming of staging and storage areas.

6.0 Government-Furnished Property

The government may furnish up to 30 tons of unprocessed quarry rock from a quarry site at approximately milepost 11.4 along Red Mountain Road. The site is displayed in the attached map and listed in the treatment table.

The BLM will stake and flag the site prior to work. The Contractor shall be responsible for processing and hauling this material to the treatment site(s). Materials may only be used for treatment sites along Red Mountain Road. Unused materials shall be left onsite and the site groomed to restore a more natural appearance. Any excess rock from the project may be staged and stored at the quarry site. Only previously worked and disturbed materials may be utilized.

7.0 Place of Performance

The work shall occur on Red Mountain Road in Mendocino County, California near the community of Piercy. See Maps 1 and 2. Work will commence at approximately milepost

2.5 and extend to mile 12. The BLM will mark these start and endpoints prior to work.

Coordinates for these points are:

• Intersection of Red Mountain Road and State Highway 271 o Latitude: 39.946792° o Longitude: -123.779338°

• Start of 12 mile treatment segment at mile 1.9 o Latitude: 39.951553° o Longitude: -123.757409°

• End of 12 mile treatment segment at mile 14 o Latitude: 39.919714° o Longitude: -123.644183°

Red Mountain Road is located in northernmost Mendocino County near the community of Piercy. The road is accessed at exit 625 off of Highway 101.

Coming from the north on Highway 101, exit 625 is approximately 13.5 miles south of Garberville and 1.5 south of the Piercy exit. At the exit, turn left and proceed 0.2 miles to the Red Mountain Road intersection which is signed.

Coming from the south on Highway 101, exit 625 is approximately 13 miles north of Leggett and 2 miles north of the Confusion Hill roadside park. At the exit, turn right and proceed 0.1 miles to the Red Mountain Road intersection.

Red Mountain Road traverses approximately 14 miles of private and public lands.

Moderate to high clearance vehicles are recommended for traveling the road. Any milepost figures for treatment sites are referenced from the intersection of Red Mountain Road and Highway 271 (“from the pavement”).

8.0 Period of Performance

The period of performance will extend 120 calendar days from the Notice to Proceed date.

Due to permitting requirements for the protection of water quality and federally listed species, all work must occur between May 15 and October 15.

Map 1. Red Mountain Road General Location

Map 2. Red Mountain Road Treatment Sites.

Appendix A

Schematics for Typical Treatments Specified in the Scope of Work and detailed in the Site-Specific Treatments Table.

Appendix B

Best Management Practices For the Protection of Water Quality

To maintain compliance with federal Clean Water Act Requirements, Contractor is responsible for adhering to Best Management Practices. The following list of Best Management Practices (BMPs) will be employed at treatment sites depending on the nature of treatments and the applicability of a given BMP for the site.

Construction and reconstruction BMPs:

1. Minimize fill volumes at stream crossings by restricting width and height of fill to amounts needed for safe travel and adequate cover for culverts. For deep fills (generally greater than 15 feet deep), incorporate additional design criteria (e.g., rock blankets, buttressing, bioengineering techniques) to reduce the susceptibility of fill failures.

2. Place sediment-trapping materials or structures such as straw bales, jute netting, or sediment basins at the base of newly constructed fill or side slopes where sediment could be transported to waters of the State. Keep materials away from culvert inlets or outlets.

3. Construct road fills to prevent fill failure using inorganic material, compaction, buttressing, sub-surface drainage, rock facing, or other effective means.

4. Locate waste disposal areas outside wetlands, Riparian Reserve, floodplains, and unstable areas to minimize risk of sediment delivery to waters of the State. Apply surface erosion control prior to the wet season. Prevent overloading areas, which may become unstable.

5. Design stream crossings to minimize diversion potential in the event that the crossing is blocked by debris during storm events. This protection could include hardening crossings, armoring fills, dipping grades, oversizing culverts, hardening inlets and outlets, constructing critical dips, and lowering the fill height.

6. Design stream crossings to prevent diversion of water from streams into downgrade road ditches or down road surfaces.

7. On new construction, install culverts at the natural stream grade, unless a lessor gradient is required for fish passage.

8. Place instream grade control structures above or below the crossing structure, if necessary, to prevent stream head cutting, culvert undermining and downstream sedimentation. Employ bioengineering measures to protect the stability of the streambed and banks.

9. Prevent culvert plugging and failure in areas of active debris movement with measures such as beveled culvert inlets, flared inlets, wingwalls, over-sized culverts, trash racks, or slotted risers.

10. Utilize stream diversion and isolation techniques when installing stream crossings.

Evaluate the physical characteristics of the site, volume of water flowing through the project area and the risk of erosion and sedimentation when selecting the proper techniques.

11. Disconnect road runoff to the stream channel by outsloping the road approach. If outsloping is not possible, use runoff control, erosion control and sediment containment measures. These may include using additional cross drain culverts, ditch lining, and catchment basins. Prevent or reduce ditch flow conveyance to the stream through cross drain placement above the stream crossing.

Surface Drainage BMPs:

1. Effectively drain the road surface by using crowning, insloping or outsloping, grade reversals (rolling dips), and waterbars or a combination of these methods. Avoid concentrated discharge onto fill slopes unless the fill slopes are stable and erosion-proofed.

2. Consider using broad-based drainage dips or leadoff ditches in lieu of cross drains for low volume roads. Locate these drainage features where they will not drain into wetlands, floodplains, and waters of the State.

3. Avoid use of outside road berms unless designed to protect road fills from runoff. If road berms are used, breach to accommodate drainage where fill slopes are stable.

4. Design roads crossing low-lying areas so that water does not pond on the upslope side of the road. Provide cross drains at short intervals to ensure free drainage.

5. Divert road and landing runoff water away from headwalls, slide areas, high landslide hazard locations, or steep erodible fill slopes.

Cross Drain BMPs:

1. Locate cross drains to prevent or minimize runoff and sediment conveyance to waters of the State. Implement sediment reduction techniques such as settling basins, brush filters, sediment fences, and check dams to prevent or minimize sediment conveyance. Locate cross drains to route ditch flow onto vegetated and undisturbed slopes.

2. Choose cross drain culvert diameter and type according to predicted ditch flow, debris and bedload passage expected from the ditch. Minimum diameter is 18.”

3. Locate surface water drainage features (e.g., cross drain culverts, rolling dips, and water bars) where water flow will be released on convex slopes or other stable and non-erosive areas that will absorb road drainage and prevent sediment flows from reaching wetlands, floodplains, and waters of the State. Where possible, locate surface water drainage structures above road segments with steeper downhill grade.

Locate cross drains at least 50 feet from the nearest stream crossing and allow for a sufficient non-compacted soil and vegetative filter.

4. Armor surface drainage structures (e.g., broad based dips, and leadoff ditches) to maintain functionality in areas of erosive and low-strength soils.

5. Discharge cross drain culverts at ground level on non-erodible material. Install downspout structures or energy dissipaters at cross drain outlets or drivable dips where alternatives to discharging water onto loose material, erodible soils, fills, or steep slopes are not available.

6. Cut protruding ‘shotgun’ culverts at the fill surface or existing ground. Install downspout or energy dissipaters to prevent erosion.

7. Skew cross drain culverts 45–60 degrees from the ditch line and provide pipe gradient slightly greater than ditch gradient to reduce erosion at cross drain inlet.

8. Provide for unobstructed flow at culvert inlets and within ditch lines during and upon completion of road construction prior to the wet season.

9. Install critical dips down-grade of cross drain culverts to accommodate overtopping flows. Where road grades are too adverse for critical dip construction, provide for appropriate routing of overtopping flows across road tread or into adjacent, suitably-sized drainage structure.

General Erosion Control BMPs:

1. Where sediment could be transported to waters of the State, place sediment-trapping materials or structures such as straw bales, jute netting, or sediment basins at the base of newly constructed fill or side slopes. Keep materials away from culvert inlets or outlets.

2. Suspend ground-disturbing activity if projected forecasted rain will saturate soils to the extent that there is potential for movement of sediment from the road to wetlands, floodplains, and waters of the State. Cover or temporarily stabilize exposed soils during work suspension. Upon completion of ground-disturbing activities, immediately stabilize fill material over stream crossing structures. Measures could include but not limited to erosion control blankets and mats, soil binders, soil tackifiers, or placement of slash.