SOW_Mining_Reach_Phase_II_BPA.pdf

Statement of Work for Wind River Mining Reach Phase II Restoration

Objective:

The objective of this project is to improve salmon habitat for Endangered Species Act (ESA) listed lower Columbia Steelhead in the Wind River Watershed. Using large wood obtained from nearby harvest units, large woody debris will be added to the Wind River to enhance pool quality and quantity, slow stream flow, increase streambank stability, and improve overall water quality for fish habitat. In general, the work under this project includes, but is not limited to, the following major items of work as specified. The following descriptions are provided as an outline of major work items and shall not be construed as an inclusive or complete listing of all items of work under this task order.

Instream Project Location:

The instream restoration site is located approximately 45 miles northeast of Carson, Washington or 20 miles north of Carson, WA. The project area is located north of Carson on Wind River Highway /USFS 30 road approximately 52 miles northeast of Amboy, Washington and approximately 18 miles north of Carson, WA and in Township 5N, Range 7E Section 7, 9, 16, and 17, and Township 6N, Range 7E, and Section 28 and 33 (Figure 1). The project can be located by traveling north of Carson on Wind River Highway or traveling northeast from Amboy on WA-503 to National Forest (NF) Road 90 then from Curley Creek Rd to Wind River

Highway. The excavator, skidder and log trucks will use these roads to gain access to the log staging areas and instream project sites. The equipment will be used to place trees, gravel, and boulders below and above ordinary highwater areas of the Wind River.

Figure 1. Project location area.

Hourly Items based on low bid From BPA (Instream Project Work):

The Contracting Officers Representative (COR) will supply the engineered log jam designs and oversight. The contractor will supply equipment and operator on an hourly rental basis to complete the following items:

• Mobilization: All vehicles and heavy equipment to be used on-site is to be cleaned to remove soil, seeds, vegetative matter or other debris that could contain invasive species. Cleaning will be done by the contractor before mobilizing onto National Forest Lands. If equipment moves from or between project sites or areas known to be infested into other areas, infested or otherwise. The Contracting Officer’s Representative (COR) will meet with the contractor to inspect every piece of equipment before they enter Nation Forest Lands.

• Trees are to be transported throughout the site via skidder and moved into place with an excavator. As needed, bed material will be moved short distances and placed where needed during log jam construction.

• Large diameter trees (22” to 43” DBH) will be felled on site with an excavator, leaving root wads attached and keeping the tree as long a possible for use as key pieces during log jam construction.

• Construct log jams by following the designs and considering on-site recommendations by the acting COR. Trenches will be excavated into stream banks and gravel bars at marked locations with the recommended depths and widths suggested on-site by the COR as needed to account for frequent changes to this complex system, which will naturally deviate over time from the designs. Trees are placed in appropriate positions within the trenches and backfilled as recommended on-site by the COR.

• All landings, skid roads, and compacted sites will be rehabilitated via decompaction with excavator, mulched with slash, and any bare soils seeded with grass. Large holes left from pushing trees over will be leveled to the elevation of native ground. Work is to progress from the rear of the units to the landing, to avoid travel on rehabilitated soils. It is recommended that an excavator be used for this work. Bare soil is to be seeded with native grass.

Project and Log Structure Design:

• The following pages provide criteria for instream structure construction by excavator and/or riparian felling in Wind River. Included is a location of possible instream structures and a templates of typical structure types. These drawings are only templates as each structure will be built to site specific conditions that require a field fit due to the frequent changes to this complex system which will naturally deviate from the designs. A COR will be present on-site to provide recommendations as changing and unforeseen project site variables become apparent during implementation.

Project design and overview in LiDAR view. Figure 2.

Project design and overview in ariel view. Figure 3