Revised Attachment 4 BooneFork_WatershedImprovement_2020_Specification 05282020.docx

Boone Fork Watershed Improvement Project - Specifications

STREAM RESTORATION SPECIFICATIONS

EQUIPMENT AND OPERATOR SPECIFICATIONS

A) Manner of Construction - Excavation will 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 will be instructed by the construction inspector as to the desired result of construction activities. Operators will be responsible for determining how best to use equipment to achieve the desired results. A Chain saw operator will 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 will 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 will 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. Equipment fluid spills shall be cleaned up and material properly disposed of immediately by the Contractor. Contractor shall provide a spill response kit to quickly mitigate soil and water cleanup.

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

E) Equipment Specifications:

Hydraulic Excavator (Trackhoe):

Track mounted, hydraulic powered.

Excavator:

Min weight – 36,000 lbs Min. Reach – 26 feet Min Digging Depth – 17 feet Min Bucket size – 1.0 cu yd Min 90 HP Equipped with hydraulic thumb, with experienced operator as described above. (More than 1 excavator may be required. Unit price bid should be for one excavator for one hour of running time).

All-terrain Dump Truck:

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

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 will not be considered as alterations in the details of construction or a change in the character of the work.

Materials Stone for “Gravel”, “Rip-rap”, and "Boulder" shall consist of blasted stone or other stone approved by the Designer. All stone shall be largely clean of fines, sound, tough, dense, resistant to the action of air and water, and suitable in all other respects for the purpose intended. “River Stone” shall consist of washed gravel, cobble, and small boulder sized alluvial stone, generally rounded in nature, derived from an off-channel quarry located within a 100 mile radius of the site.

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 will be determined by measuring its long dimension.

Acceptance Criteria for Stone

CLASS

REQUIRED STONE SIZES (INCHES)

Minimum

Average

Maximum

River Stone

Boulder 48" x 24" x 18"

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 will 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 will be measured by weight. Measured by weight will require the quantity to be weighed in trucks on certified platform scales. Stone that was previously stockpiled for other bid items will 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, will be paid for at the contract unit price per ton. Such price and payment will 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 will be made under:

River Stone, Gravel, Rip-rap, & Boulder....................................................................................TON

Cross Vane & Ford Replacement

Description This structure serves to decrease stress in the near-bank region while promoting scouring in the downstream pool. Boulders are placed at an angle to the stream bank, gradually inclining in elevation until they are located near bankfull elevation directly adjacent to the stream bank. Water flowing downstream is forced over the “line” of boulders towards the middle of the channel, effectively scouring out a pool below. The upstream invert of the cross vane would hold elevation of the natural bottom ford.

Materials All materials shall meet the requirements of boulder as outlined in Special Provision "Structure Stone". Back fill material shall be obtained from the stream channel bed, likely from the constructed pool. Large woody debris may be incorporated into the structure as directed by the Designer.

Installation A trench shall be dug in such a manner that the footer boulders are buried beneath the bed surface elevation. An excavator, with a bucket that includes a hydraulic thumb, shall be used to place boulders under the supervision of Designer. Footer boulders shall be placed first with header boulders placed on top prior to any back filling of the trench. Boulders shall be selected and positioned such that they butt tightly together and there are multiple contact points between all boulders (flat smooth surfaces that fit together). Gaps between boulders shall be filled (chinked) with a combination of class A and No. 57 size stone found on site until plugged. In the center portion of the channel (vane invert), the header boulder shall be placed with gaps between the rock with the top of the header boulder at an elevation designated by the Designer. The header boulders in the side, or wing, portion shall be placed in such a manner as they slope up from bed elevation to bankfull or below at a 2 to 7 percent slope or as shown in detail. Header and footer boulders at both banks shall be tied in securely to the bank in such a way that eliminates the possibility of water diverting around them. A rock sill shall be utilized to further prevent water from cutting around the structure. The area between the stream bank and vane on the upstream side of the structure will be backfilled with stream bed material.

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 Payment for installation of Cross Vane shall be as outlined. This payment shall be considered full compensation for all labor, equipment, hauling, placing, handling, sorting, fitting, materials, and incidentals necessary to construct the boulder vane.

Payment will be made under:

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

River Stone, Gravel, & Boulders…..……………….………………………….………...TON Provide & maintain Pump-around……………………………………………………….EACH Culvert Removal…………………………………………………………………………..EACH

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 and 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………………………………………………………………………………..………..HOUR Materials:

Woven geotextile fabric……………………………....……….……………………......LINEAR FEET

Toe-wood/Sod mat (Revetment) 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. Live transplant vegetation shall be provided by the Forest Service from near the site. Seed and coir matting 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. Where available, 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). Transplants of small trees and shrubs, excavated from nearby, shall be placed on top of the toe-wood up to the bankfull elevation. This shrub mat will 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 and coir matting installed.

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 will be made under:

Equipment & Labor………………………………………………………………………………….………..HOUR Materials:

EROSION CONTROL SPECIFICATIONS

Seed (Native)

Description Seeding shall occur within 24 hours of ground disturbing activities. Seed shall be applied by hand or with a cyclone seeder and on steep slopes be immediately covered with leaf litter, raked in from the surrounding area. 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 will 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.

Payment will be made under:

Seed ………….……………………………………………………………….…………..………………..ACRE

Coir Matting

Materials All materials shall meet the approval of the Designer and include Coir fiber mat 700 (6-8 feet wide), hardwood stakes and pine stakes.

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 both hardwood and pine stakes. Provide stakes made of hardwood, 2’ tall and 1 inch square, to anchor the matting along the edges. These edge-stakes shall be installed to no less than 1 foot deep. Also, provide 1’ tall pine wood stakes for the interior of the 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 will lie smoothly but loosely on the soil surface. Bury the top end of each piece of matting in a narrow trench at least 6 inch 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, top and bottom and within the interior, approximately 2 feet apart.

Basis of Payment Payment for installation of matting will 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 will be made under:

Coir Mat (700 weight) ………………………………………………………….…………..LINEAR FEET

Pump Around Operation

This dewatering plan is required at the two (2) Culvert Removal/Ford Construction sites. The detail below shows the minimum acceptable criteria, and may require additional measures. The contractor will discuss a design/plan with the COR/Designer for approval that meets or exceeds the standards shown. Maintaining the water turbidity downstream (not exceeding the turbidity of the upstream waters) is the responsibility of the contractor throughout the duration of the project. Pumps capable of pumping streamflow shall be on-site until in-stream work is completed. Overnight pumping is not permitted. The contractor is responsible for maintaining the new construction area in as dry a condition as possible during construction.

Installation See detail below.

Basis of Payment Payment 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 and maintain the pump around operation.

Payment will be made under:

Provide & maintain Pump-around ………………………………………………….…………………….EACH

Ditch Relief Culvert

Ditch relief culverts shall be installed in new locations to reduce storm water runoff at existing ditch relief and stream crossing culverts. Three (3) culverts are planned to mitigate erosion at existing culvert outlets. Sites will be designated by the Designer and flagged in the field.

Materials Twenty-four (24) inch Corrugated Metal Pipe Culvert, 14 Gauge, (0.079), Aluminized-Steel Type 2.

Installation See details below.

Payment 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 and maintain the the culverts.

Payment will be made under:

Ditch Relief Culvert ………………….………………………………………………….…………………….EACH Boone Fork Watershed Improvement Project Page 1 image4.emf image5.jpg image6.emf image7.emf image8.emf image1.png image2.jpg image3.jpg