HomeMy WebLinkAbout20200372 Ver 1_Attachment 2_BooneFork_StreamEnhancementProject_Specification_20200311Boone Fork Stream Enhancement Project Page 1
Attachment 2 -
Boone Fork Stream Enhancement 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.
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. Chain
saw operators 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. Spills shall be cleaned up and
material properly disposed of immediately.
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:
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).
Skid Steer Loader:
Track mounted, hydraulic powered.
1,251 lbs minimum standard rated operating load
Front-end loader attachment for hauling stone to work sites
Boone Fork Stream Enhancement Project Page 2
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 "Misc. 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.
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
2
6
12
Gravel 3/4 1 1 1/2
Rip-rap 4 6 8
Boulder
48" x 24" x 18"
30
48
60
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 for "Misc. Boulder". 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.
Boone Fork Stream Enhancement Project Page 3
Payment will be made under:
River Stone, Gravel, Rip-rap, & Misc. 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 downstre am 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 c onsidered
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) 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……………………………....……….……………………......SQUARE YARD
Boone Fork Stream Enhancement Project Page 4
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 hauled off the site
and dumped within 5 miles by the contractor. Seed, mulch, coir matting, and riparian plantings (live stakes,
potted material, etc.) 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 will
replace the “sod mat”. From the bankfull elevation the verticle slope shall be excavated to the 2:1 slop e (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.
Boone Fork Stream Enhancement Project Page 5
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 will be made under:
Equipment & Labor………………………………………………………………………………….….…..HOUR
Materials:
Coir Matting………………….……………………………………..………………….... SQUARE YARD
Seed ………………………………………………………………………………………….………ACRE
Riparian Plantings……………………………………………………………………..………….…EACH
EROSION CONTROL SPECIFICATIONS
Seed (Native)
Description
Seeding shall occur within 24 hours of ground disturbing activities. Seed shall be applied by h and or with a cyclone
seeder and on steep slopes be immediately covered with leaf litter, raked in from the surrounding area. On stream
banks, biodegradable matting/blanket 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
Scientific Name Common Name Planting Density
Elymus virginicus Virginia wild rye 22 lbs/acre
Festuca rubra Creeping red fescue 5 lbs/acre
Materials
All materials shall meet the approval of the Designer.
Basis of Payment
Stabilization of Vertical Banks on outside Meander Bend
Construction of Bankfull Bench using TOE WOOD/SOD MAT DETAIL
Bankfull Elevation
Pre-construction
Channel Bottom
Low flow Elevation
Channel Bottom
Terrace elevation
Toe Wood bench
CONSTRUCTION ITEMS AND
SEQUENCE:
•Excavate high bank to construct a
2:1 slope from bankfull to terrace
elevation
•Excavate & construct toe wood
bench and new channel pool
feature based on reference pool
dimensions
•Place trees/logs/tops on toe wood
bench & in toe of bank below low
flow
•Place willow cuttings/bundles on
toe wood
•Excavate sod mats (using a front
end loader) or shrub transplants
(e.g. alder, willow) and place on toe
wood up to bankfull elevation
•Seed bank with native grass seed
•Cover sod mat and sloped bank
with coir erosion control matting
•Plant willow/silky
dogwood/elderberry cuttings into
relocated sod mat and bank to help
“pin”sod into bank
TOE WOOD
FOOTER LOGS
SOD MAT
EXCAVATED BANK MATERIAL
Brady Dodd
NFNC Hydro
Boone Fork Stream Enhancement Project Page 6
Payment for installation of seed and mulch 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 and
mulch.
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, 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 in ch 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) ………………………………………………………………….…………..SQUARE YARD
Plantings
Description
Plantings shall be specified in each contract as to type e.g., container, bare root, and live staking. Plantings from
containers shall be from one gallon containers and can be planted throughout the year. Live staking and bare root
planting shall occur during plant dormancy. Bare root seedlings shall be 6 to 12 inches tall. Below is a list of woody
vegetation species to be planted on stream banks and floodplains.
Scientific Name Common Name Percent of plantings Spacing (feet)
Container & Bare Root Species:
Alnus serrulata Tag Alder 20% 3
Calycanthus floridus Sweetshrub 10% 3
Clethra acuminata Cinnamon Bark Clethra 10% 4
Hamamelis virginiana Witch Hazel 10% 4
Hypericum densiflorum Bushy St. Johns 10% 4
Itea virginica Virginia Sweet Spire 10% 4
Xanthorhiza simplicissima Yellowroot 10% 2.5
Platanus occidentalis Sycamore 20% 6
Live Stake Species:
Cornus ammonum silky dogwood 10 3
Salix nigra black willow 20 3
Salix sericea silky willow 20 3
Boone Fork Stream Enhancement Project Page 7
Salix humilis prairie willow 10 3
Sambucus canadensis common elderberry 30 3
Physocarpus opulifolius ninebark 10 3
Materials
All materials shall meet the approval of the Designer.
Basis of Payment
Payment for installation of plantings 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 plant.
Payment will be made under:
Plantings…..…………………………………………………………………………………………..……………EACH