B08_Service_PWS_Template_Butte-Larabee.docx

Performance Work Statement (PWS)

Butte-Larabee Road Sediment Assessment April 15, 2026

Contents

PWS 1.0 Background on the Government’s Requirement

The Butte-Larabee sediment assessment project will inventory approximately 16 miles of roads within the middle Van Duzen River watershed. The effort is motivated by requirements to mitigate nonpoint source pollution in watersheds designated as impaired under the Clean Water Act.

Initial reconnaissance indicates approximately 65 sites may exist across the road networks (Exhibits A and B).

This project consists of three main work tasks: 1) a field inventory; 2) data entry and analysis; and 3) preparation of a prioritized plan-of-action including estimated implementation costs for roads treatments. Based on initial reconnaissance, approximately 65 sites exist along the roads in the project area.

PWS 2.0 General Scope of Work

The contractor shall:

1. Conduct an on-the-ground assessment of the road network to identify and prioritize for treatment roads-related sediment sources,

2. Identify road segments that are an impairment to vehicle access (e.g. rutted and pothole segments),

3. Identify poorly performing culverts (i.e., advanced rusting, crushing or separation; or undersized/misconfigured for hydrologic conditions)

4. Develop a prioritized treatment list for sediment reduction, vehicle access sites and degraded culverts. This list will also include site-level implementation costs, materials volumes and sediment reductions accrued through treatment for all moderate and higher priority sites.

Place of Performance:

Exhibits A and B detail the roads network. The roads are accessed from State Highway 36 in the vicinity of Larabee Valley approximately ten miles east of Bridgeville, California. Two road networks will be inventories:

1. Butte Creek Road and associated spurs on public lands and public easements.

2. Larabee Butte Road and associated spurs on public lands and public easements.

Period of Performance:

The period of performance shall be for five months, commencing upon award.

PWS 3.0 Overall Objective(s) The objective of this work is to satisfy requirements from the North Coast Regional Water Quality Control Board to:

(1) identify controllable sources of sediment,

(2) Quantify potential sediment delivery volumes

(3) Develop prioritized treatment plans

(4) Calculate the volume of sediment “saved” with treatment

The contractor shall provide the BLM with cost and materials estimates to treat moderate and higher priority sites.

PWS 4.0 Specific Tasks

Task 1: Field Inventories to Delineate Controllable Road-related Sediment Sources and Vehicle Impairment Sites

Prepare base maps, field data forms, and conduct a systematic field inventory of the Butte-Larabee roads network. This road network is maintained by the BLM and accessible to the public. The inventory will address three issues for road-related drainage infrastructure:

For each identified site, collected data shall include information such as: 1) the nature and magnitude of existing and potential erosion problems, 2) the likelihood of erosion or slope failure, 3) diversion potential, 4) active channel width for stream crossing sites, 5) the recommended treatment immediacy, 6) the estimated volume of future erosion, 7) the percentage of delivery to the stream system, and 8) recommended treatments to eliminate or significantly reduce the risk of future sediment delivery, improve vehicle access, or repair failed culverts. All data, spatial and site-specific, shall be provided digitally to the government across common software platforms.

Task 2: Data Entry and Analysis.

3.2.1. Volume Calculations, Culvert Sizing and Database Entry Stream crossing fill volumes including potential volume of erosion and sediment delivery at a stream crossing feature and treatment excavation volumes will be calculated. Similar volume data will be collected for road-related landslides. Discharge estimate calculations will be performed at all stream crossing sites to determine the appropriate culvert size or drainage structure for the 100-year return interval flood flow (HW/d<1) and associated debris and sediment. Culvert diameters shall be compared with field-measured channel widths to ensure that all culverts are at least 0.7 times the active channel width.

Task 3: Data Synthesis.

Data analysis will include the generation of data tables summarizing the types of problems by treatment immediacy, potential erosion volumes, excavation volumes, and erosion/sediment control treatments for the site. Each site should include a “sediment savings” value that would apply if the site were treated. To comply with North Coast Regional Water Quality Control Board mitigation requirements, erosion savings due to treatments shall be expressed as a tons/year value. These tables will include the types of treatments, material needs (road rock, rip-rap rock, culverts, mulch, etc.), costs for heavy equipment, labor, materials, required to implement all recommended storm-proofing and vehicle access treatments. The database will then be analyzed to evaluate the projected cost-effectiveness for implementation of all or a portion of the proposed road and erosion feature treatments, as well as for developing the final report. GIS site maps will be prepared showing the type of erosion feature and treatment priority for each controllable sediment source identified in the field inventory.

Task 4: Prepare Implementation Plan Including Costs.

Prepare final sediment- and road-related prioritized action plan summarizing the results of the inventory. Costs shall be provided on a site-by-site basis to enable the BLM to assemble a roster of treatment sites to fit within a specific budget.

All inventory methods, calculations, prioritization and recommended treatments shall be modeled after the guidelines described in the California Salmonid Stream Habitat Restoration Manual, Chapter 10 (Weaver, et al., 2010) and the "Handbook for Forest, Ranch and Rural Roads, a Guide for Constructing, Re-constructing, Maintaining and Closing Wildland Roads" [commissioned by the State Water Resources Control Board and the California Department of Forestry and Fire Protection (CALFIRE) (Weaver et al., 2015)].

PWS 5.0 Delivery / Performance Schedule

1. Pre-work Conference: Within ten days of award, contractor shall schedule a conference call or meeting with the BLM Contracting Officer’s Representative (COR) to review the Statement of Work and discuss logistical issues related to the survey.

2. Draft Submittals and Reviews: BLM COR shall be provided draft inventories, priorities and recommended treatments for review and comment. BLM will have two weeks to review all drafts. A minimum of two drafts shall be provided to the BLM COR for review. Contractor shall maintain a record of all comments received and how they are addressed in the final submittal.

3. Field Review: Contractor shall conduct a minimum of one field review with the BLM COR prior to submittal of the final report. Field review will review proposed priorities, treatments, costs and logistics.

4. Project Completion Date: The final Action Plan and all associated maps and data shall be submitted no later than five months after award.

5. Delivery Format: Delivery of final materials will be a minimum of three hardcopies of the action plan, digital databases and all photos and other records in the appropriate file formats suitable for use on Windows operating system computers. The final reports shall also be provided in digital format as pdf documents. A GIS database of the inventory shall also be provided with appropriate metadata to navigate the data.

PWS 6.0 Government-Furnished Property, Materials, Services

General:

The Contractor shall furnish all personnel, materials, equipment, supplies, facilities, transportation, tools, materials, supervision, and other items and non-personal services necessary to perform the work tasks defined in this Performance Work Statement, except for those items specified as government-furnished.

Materials:

The Government shall furnish basic map products showing the extent of the assessment roads and easements.

PWS 7.0 Security and Administrative Matters

Regular Work Hours:

The performance period established for this contract is based upon all work being conducted during regular working hours between 7:00am and 5:00pm, Monday through Friday, excluding government holidays. If the Contractor desires to carry on work outside regular hours, including Saturdays, Sundays, and government holidays, a request must be submitted to the Contracting Officer in sufficient time to allow satisfactory arrangements to be made for access to the work site.

Communications:

“Time” for communications received after 3:00pm, after 12:00 pm locally on Fridays, or after 12:00 pm locally prior to a holiday will not start until the next business day. All times are local Pacific Standard Time.

Federal Holidays:

The following Federal Legal Holidays are observed:

Fire Danger Season:

If the Contracting Officer Representative (COR) allows the Contractor to continue work during periods of declared fire danger or season, the Contractor shall comply with all applicable state laws relating to fire prevention and with all special conditions of work as directed by the COR.

Private Lands:

Access to private lands in the assessment area is prohibited unless expressly allowed by the landowner. BLM- maintained roads traverse private lands through an easement. All activities shall remain with the easement which generally runs 50 feet from the centerline of the road in either direction.

PWS 8.0 Project Area Maps

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