Attachment 01 Final SOW Moccasin Crk Specifications.docx

Moccasin Creek Stream Enhancement Project

STREAM RESTORATION SPECIFICATIONS

EQUIPMENT AND OPERATOR SPECIFICATIONS

A) Manner of Construction - Excavation shall be done in a manner which will minimize sedimentation in the stream channel.

B) Equipment Operator Performance - Equipment operators shall be experienced and competent in the use of the equipment to which they are assigned. They shall be expected to demonstrate a level of proficiency with the equipment which enables them to be productive in all aspects of stream restoration work. Equipment operators shall be experienced in the construction of Rosgen designed structures; including the cross vane, J-hook vane, and Toe-wood/Sod mat revetment.

Operators shall be instructed by the construction inspector as to the desired result of construction activities. Operators shall be responsible for determining how best to use equipment to achieve the desired results. Chain saw operators shall be required to cut trees, limbs and root masses as necessary to facilitate the removal and placement of debris in the stream.

C) Environmental Considerations - Earth moving equipment shall cross and operate in the stream flow only when necessary and only when directed to do so by the construction inspector. Equipment shall be new or of low hours and be maintained to prevent fuel, oil and lubricant spills in the vicinity of the stream. Refueling, repairs and lubrication shall be performed at a safe distances from the stream and only at locations approved by the construction inspector where water is controlled by runoff control measures.

D) Safety Considerations - At work sites, where equipment shall be operated on Forest Roads, flagman shall be stationed to warn oncoming traffic of congestion. Construction road signs shall be in place and a means of removing sediment, mud or rocks from roadways shall be established. The contractor shall be responsible for the implementation of these measures.

E) Equipment Specifications- Hydraulic Excavator:

Track mounted, hydraulic powered.

Excavator:

Min weight – 30,000 lbs Min. Reach – 22 feet Min Digging Depth – 20 feet Min Bucket size – 1.0 Cu Yd.

Min 115 HP Equipped with hydraulic thumb, with experienced operator as described above. Unit price bid shall be for one excavator for one hour of running time.

Dump – Track Truck:

Track mounted Min. weight – 8,000 lbs Min. carrying capacity – 7,000 lbs (Unit price bid shall be for one truck for one hour of running time and experienced operator).

Payment will be made under:

Hydraulic Excavator /Mobilization.............................................................................HOURS/EACH Dump – Track Truck /Mobilization.............................................................................HOURS/EACH

IN-STREAM STRUCTURES SPECIFICATIONS

Structure Stone Description The work covered by this section consists of furnishing, stockpiling, placing and maintaining approved stone to be utilized to construct rock and log vanes, root wad structures, the step-pool structures, stream crossings, sediment and erosion control measures for use in locations as directed by the Designer. The quantity of stone may be increased, decreased, or eliminated entirely at the direction of the Designer. Such variations in quantity shall not be considered as alterations in the details of construction or a change in the character of the work.

Materials Stone for “Clean 57-stone” and "Boulder" shall consist of blasted stone or other stone approved by the Designer. The stone shall be sound, tough, dense, resistant to the action of air and water, and suitable in all other respects for the purpose intended.

All stone shall meet the approval of the Designer. While no specific gradation is required, the various sizes of the stone shall be equally distributed within the required size range. The size of an individual stone particle shall be determined by measuring its long dimension.

Acceptance Criteria for Stone

CLASS

REQUIRED STONE SIZES (INCHES)

Minimum

Average

Maximum

Boulder 36 x 18 x 12

No more than 5 percent of the material furnished can be less than the minimum size specified, more than 10 percent of the material can exceed the maximum size specified. Boulders shall be relatively flat on either side in the same dimension, preferably the long dimension.

Construction The Contractor shall place stone, in locations shown on the construction plans to the thickness, widths, and lengths as shown on the construction plans or directed by the Designer. All stone shall be placed neatly and uniformly with an even surface to form an in-stream structure or a sediment and erosion control device or in accordance with the construction plans and special provisions, and shall meet the approval of the Designer.

Method of Measurement The quantity of stone required to construct the structures or sediment and erosion control measures detailed in these special provisions shall be incidental to those bid items. However, field conditions may warrant the need for additional stone greater than the quantity specified or detailed for each bid item. The quantity of stone that has been incorporated into the project, as directed or approved by the Designer, which exceeds 110% of the quantity required for each bid item shall be measured by weight. Measured by weight shall require the quantity to be weighed in trucks on certified platform scales. Stone that was previously stockpiled for other bid items shall not be measured a second time for this provision.

Basis of Payment When field conditions dictate the need for additional quantity greater than 10% of the bid item, the quantity of stone measured as provided above, shall be paid for at the contract unit price per ton for “Boulder". Such price and payment shall be full compensation for all work covered by this section, including but not limited to furnishing, weighing, stockpiling, re-handling, placing, and maintaining the stone and disposal of any materials not incorporated into the project if directed by the Designer.

Payment shall be made under:

Clean 57-stone…………………………………………………………………………………TON Boulder..........................................................................................................................TON

Log Vane

Description This structure serves to decrease stress in the near-bank region while promoting scouring in the downstream pool. Logs are placed at an angle to the stream bank, gradually inclining in elevation until they are located near ½ bankfull elevation directly adjacent to the stream bank. Water flowing downstream is forced over these logs towards the middle of the channel, effectively scouring out a pool below. The quantity of log vanes may be increased, decreased, or eliminated entirely at the direction of the designer. Such variations in quantity will not be considered as alterations in the details of construction or a change in the character of the work.

Materials Trees to be used for the vane shall be provided by the Forest Service from near the site. All log materials shall be at least 10 inches in diameter. A sheet of woven geotextile fabric (4oz. or greater, 6-8 feet wide) shall be placed the length of the vane arm on the upstream side, stapled to the top log in a manner that they will be covered by back fill material. Back fill material shall be obtained from the stream channel bed.

Installation A trench shall be dug in such a manner that the footer and header logs are buried beneath the bed surface elevation at least three feet. An excavator, with a bucket that includes a hydraulic thumb, shall be used to place logs under the supervision of Designer. Logs shall be tightly sealed with no gaps between the header and footer log. Filter fabric shall be placed on the upstream side of the structure and backfilled with materials excavated on-site to prevent the washout of sediment through log gaps. Filter fabric shall extend from the bottom of footer log to the finished grade elevation and shall be placed the entire length of the structure. Header and footer logs shall be tied in securely to the bank in such a way that eliminates the possibility of water diverting around them. Structures shall be built to the approval of the Designer. The Designer may adjust the number and placement of structures in the field.

Basis of Payment This payment shall be considered full compensation for all labor, equipment, hauling, placing, handling, sorting, fitting, materials, and incidentals necessary to construct the Log Vane. Trees to be used for the vane shall be provided by the Forest Service.

Payment will be made under:

Equipment & Labor………………………………………………………………………..….…..HOURS Materials:

Woven geotextile fabric……………………….………..……….……………....LINEAR FOOT

Toe-wood/Sod mat (bankfull bench) Description This structure serves to protect a length of stream bank by biulding a new bank with a bankfull area where one did not exist before due to unstable conditions (See Toe-wood/Sod mat detail below). The structure creates a large undercut bank providing an abundance of aquatic cover type habitat.

Materials Trees and brush to be used for the structure shall be provided by the Forest Service from near the site. Shrubs and willow shall be provided by the Forest Service from near the site. Excavated soil shall be dispersed on the site. Seed, mulch, and coir matting (6-8 feet wide) shall be provided and installed by the contractor.

Installation The channel shall be excavated to build a bench on the channel bottom on the outside of the meander bend. Its elevation shall be well below determined low water elevation. A deep pool shall be constructed where the new thalweg will be located, and excavated material shall be used to build the point bar and back fill the structure. Footer logs laying parrallel to the stream channel shall be placed on the bench, then the toe-wood on top of that. Toe-wood shall consist of a mixture of sizes, but include several large tree stems with root wads attached. Stems shall be pushed into the bank were possible. Trees, brush, and limbs shall all be used to fill this area with woody debris, and be placed up to the low flow elevation. Bundles of live stakes, e.g. willow, shall be placed on top of the woody debris and alluvial backfill shall be placed on the structure (amount determined by Designer). Shrubs, excavated from nearby, shall be placed on top of the toe-wood up to the bankfull elevation. This shrub mat shall replace the “sod mat”. From the bankfull elevation the verticle slope shall be excavated to the 2:1 slope (run to rise). Excavated soil material shall be scattered on the adjacent terrace. All slopes shall have seed, mulch, and coir matting installed. Riparian plantings shall be installed on the slope and during the plant dormant season, live stakes shall be installed in the bench and bank.

Basis of Payment This payment shall be considered full compensation for all labor, equipment, hauling, placing, handling, sorting, fitting, materials, and incidentals necessary to construct the bankfull bench. Trees to be used for the structure shall be provided by the Forest Service.

Payment shall be made under:

Equipment & Labor…………………………………………………………………………..….…..HOURS Materials:

Coir Matting………………….……………………………………..…………….... LINEAR FOOT

EROSION CONTROL SPECIFICATIONS

Native Seed & Mulch

Description Seeding shall occur directly following the completion of ground disturbing activities. Seed shall be applied by hand or with a cyclone seeder and covered with straw mulch. On stream banks, Coir matting shall be placed to keep seed and soil in place. Below are native grass species to be sown and their seeding density of pure live seed.

Community Type: Riparian

Materials All materials shall meet the approval of the Designer.

Basis of Payment Payment for installation of seed and mulch shall be paid for as outlined. This payment shall be considered full compensation for all labor, equipment, furnishing materials, hauling, rehandling, sorting, materials, and incidentals necessary to seed and mulch.

Payment shall be made under:

Seed & Mulch………………..……………………………………………………………….…………………..ACRE

Live Stakes

Description Live staking planting shall occur during plant dormancy. Live stakes shall be at least 2 feet in length and a diameter of ½ inch minimum. Below is a list of woody vegetation species to be planted on stream banks and floodplains.

Live Stake Species:

All materials shall meet the approval of the Designer.

Basis of Payment Payment for installation of plantings shall be paid for as outlined. This payment shall be considered full compensation for all labor, equipment, furnishing materials, hauling, rehandling, sorting, materials, and incidentals necessary to plant.

Payment shall be made under:

Live stakes…..………………………………………………………………………………..…………………EACH

Matting

All materials shall meet the approval of the Designer and include Coir fiber mat 700 (6-8 feet wide), hardwood stakes, and live stakes (see “Live Stakes” Specs).

Installation Coir fiber mat 700 shall be used on upper and lower stream banks (above and below the bankfull elevation). The matting shall be fastened in place using hardwood stakes. Provide stakes made of hardwood to anchor the matting. Stakes shall be installed to no less than 1 foot deep for use on side slopes and along the top edge of matting.

Place the matting upon final grading, following seed and mulch application. Provide a smooth soil surface free from stones, clods, or debris which will prevent the contact of the matting with the soil. Unroll the matting on the contour, starting at the bottom of the slope and apply without stretching such that it shall lie smoothly but loosely on the soil surface. Bury the top end of each piece of matting in a narrow trench at least 6 in. (150 mm) deep and tamp firmly after staking with evenly spaced stakes. Stake the matting according to the manufactures recommended pattern for specific product and slope. Where one roll of matting ends and a second roll begins, install matting end-over-end with approximately 6 inches of overlap. Stake through overlapped area. Install stakes across the matting at ends, junctions, and trenches approximately 1.3 feet apart.

During the following plant dormant season, live stakes shall be planted in the matting from water’s edge to just above bankfull. Species include silky dogwood (Cornus ammonum), black willow (Salix nigra), silky willow (Salix sericea), ninebark (Physocarpus opulifolius) and common elderberry (Sambucus canadensis) from a local source.

Basis of Payment Payment for installation of matting shall be paid for as outlined. This payment shall be considered full compensation for all labor, equipment, furnishing materials, hauling, stockpiling, rehandling, sorting, fitting, materials, and incidentals necessary to install matting.

Payment shall be made under:

Live stakes……………………………………………………………………………………………….EACH Coir Matt 700 …………..………………………………………………………………………………..LINEAR FOOT

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