163Miscellaneous Erosion Control Items

163.1General Description

This work includes constructing and removing: • Silt control gates • Temporary erosion control slope drains shown on the Plans or as directed • Temporary sediment basins • Sediment barriers and check dams • Rock filter dams • Stone filter berms • Stone filter rings • Temporary sediment traps • Other temporary erosion control structures shown on the Plans or directed by the Engineer This work also includes applying mulch (e.g., straw, hay, erosion control compost), and temporary grass. 163.1.01 Related References

ection 890—Seed and Sod

141 141 141 141 141 141 141 141 141 141

AASHTO M252 AASHTO M294 163.1.02 Submittals Provide written documentation to the Engineer as to the average weight of the bales of mulch.

163.2Materials

Provide materials shown on the Plans, such as pipe, spillways, wood baffles, and other accessories including an anti-seep collar, when necessary. The materials shall remain the Contractor’s property after removal, unless otherwise shown on the plans. Materials may be new or used; however, the Engineer shall approve previously used materials before use. Materials shall meet the requirements of the following specifications: Material Section Mulch 893.2.02 Temporary Silt Fence 171 Concrete Aprons and Footings shall be Class A 500 Rip Rap 603 Temporary Grass 700 Triangular Silt Barrier 720 Coarse Aggregate 800 Lumber and Timber 860.2.01 Preservative Treatment of Timber Products 863.1 Corrugated Polyethylene Temporary Slope Drain Pipe 845 63.2.01 Delivery, Storage, and Handling General Provisions 101 through 150.

163.3Construction Requirements

163.3.01 Personnel General Provisions 101 through 150. 163.3.02 Equipment General Provisions 101 through 150. 163.3.03 Preparation General Provisions 101 through 150. 163.3.04 Fabrication General Provisions 101 through 150. 142 142 142 142 142 142 142 142 142 142

163.3.05 Construction

If silt control gates are required or are directed by the Engineer, follow these guidelines to construct them:

tructure will be constructed.

nstall the silt control gate at the inlet of the structure. Use the type indicated on the plans.

ary the height of the gate as required or as shown on the plans.

inish grading the roadway in the affected drainage area. Grass and mulch slopes and ditches that will not be p aved. Construct the ditch paving required in the affected area.

i s stabilized.

emove the Type 1 silt gate assembly by sawing off the wood posts flush with the concrete apron. Leave the concrete apron between the gate and the structure inlet in place. The gate shall remain the property of the Contractor.

If temporary slope drains are required, conduct the roadway grading operation according to Section 161 and follow these guidelines:

according to the plans.

connections in the pipe are leak proof.

of 200 ft. (60 m) maximum on steeper grades, or more frequently as directed by the Engineer. Keep the slop e d rains in place until the permanent grass has grown enough to control erosion.

d rains may remain in place to help establish permanent grass if approved by the Engineer.

Construct temporary sediment basins according to the Plans at the required locations, or as modified by the Engineer.

• Grading • Drainage • Riprap • Spillways • Anti-seep collar • Temporary mulching and grassing on internal and external slopes • Accessories to complete the basin

143 143 143 143 143 143 143 143 143 143

Construct sediment barriers according to the Plan details. The following items may be used for sediment barriers

synthetic bales of 3 ft. or 6 ft. (0.9 m or 1.8 m) in length that are capable of being linked together to form a co ntinuous roll of the desired total length. Use bales that are enclosed in a geotextile fabric and that contain a pre-mad e stake hole for anchoring.

15 ft., or 20 ft. (3 m, 4.5 m, or 6 m) in length. Use coir baled with coir twine netting with 2 in. X 2 in. (50 mm X 50 mm) openings. Use coir bales with a dry density of at least 7 lb/ft.3 (112 kg/m3). Anchor in place with 2 in. X in. (50 mm X 100 mm) wooden wedges with a 6 in. (150 mm) nail at the top. Place wedges no more than in. (900 mm) apart.

d iameter and nominally 10 ft. (3 m) in length. Use excelsior baled with polyester netting with 1 in. X 1 in. ( 25 mm by 25 mm) triangular openings. Use excelsior bales with a dry density of at least 1.4 lb/ft.3 (22 kg/m3). Anchor in place with 1 in. (25 mm) diameter wooden stakes driven through the netting at intervals of no more than 2 ft. (600 mm).

in. (450 mm) diameter. Use compost baled with photo-degradable plastic mesh 5 mils thick with a maximum 0.38 in X 0.38 in (10 mm X 10 mm) openings. Anchor in place with 1 in. (25 mm) diameter woodens takes driven through the netting at intervals of no more than 2 ft. (600 mm) in concentrated flow applications and no more than 5 ft. (1500 mm) in sheet flow applications. The sock shall be dispersed on site when no longer required, as determined by the Engineer. Do not use Compost Filter Socks in areas where the use o f f ertilizer is restricted.

compacted 1.5 ft. to 2 ft. (450 mm to 600 mm) high trapezoidal berm which is approximately 2 ft. to 3 ft. ( 600 mm to 1 m) wide at the top and minimum 4 ft. (1.2 m) wide at the base. Do not use Compost Filter Berms in areas where the use of fertilizer is restricted. The construction of the compost filter berm includes the following:

berm material may be left to decompose naturally, or distributed over the adjacent area.

When special conditions occur during the design stage, the plans may show other temporary structures for erosion control with required materials and construction methods. 144 144 144 144 144 144 144 144 144 144

Use a quick-growing species of temporary grass such as rye grass, millet, or a cereal grass suitable to the area and season. Use temporary grass in the following situations: • When required by the Specifications or directed by the Engineer to control erosion where permanent grassing cannot be planted. • To protect an area for longer than mulch is expected to last (60 calendar days), plant temporary grass as follows:

us e the minimum ground preparation necessary to provide a seed bed if further grading is required.

Omit the lime unless the area will be planted with permanent grass without further grading. In this case, apply the lime according to Section 700.

temporary grass according to Section 700. (Erosion control compost Mulch will not be allowe d w ith grassing.)

p lanted according to Subsection 700.3.05.A, Ground Preparation.

pply Polyacrylamide (PAM) to all areas that receive temporary grassing.

For projects that consist of shoulder reconstruction and/or shoulder widening, refer to Section 161.3.05H for Wood Fiber Blanket requirements.

When staged construction or other conditions prevent completing a roadway section continuously, apply mulch ( straw or hay or erosion control compost) to control erosion. Mulch may be used without temporary grassing for 60 calendar days or less. Areas stabilized with only mulch (straw/hay) shall be planted with temporary grass after 60 calendar days. Apply mulch as follows:

fter spreading the mulch, walk in the mulch by using a tracked vehicle (preferred method), empty sheep foot roller, light disking, or other means that preserves the finished cross section of the prepared areas. The Engineer will approve of the method.

the slope.

bed preparation. The mulch will become beneficial plant food for the newly planted grass .

rosion control compost - Without Grass Seed

bed preparation.. The mulch will become beneficial plant food for the newly planted grass.

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When conditions develop during construction that were unforeseen in the design stage, the Engineer may direct

the Contractor to construct temporary devices such as but not limited to:

• Bulkheads

• Sump holes

• Half round pipe for use as ditch liners

• U-V resistant plastic sheets to cover critical cut slopes

The Engineer and the Contractor will determine the placement to ensure erosion control in the affected area.

When constructing a culvert or other drainage structure in a live stream that requires diverting a stream, construct

a diversion channel.

Check dams are constructed of the following materials;

• Stone plain riprap according to Section 603 (Place woven plastic filter fabric on ditch section before

placing riprap.)

• Sand bags as in Section 603 without Portland cement

• Baled wheat straw

• Compost filter socks

• Fabric (Type C silt fence)

Check dams shall be constructed according to plan details and shall remain in place until the permanent ditch

protection is in place or being installed and the removal is approved by the Engineer.

Locate construction exits at any point where vehicles will be leaving the project onto a public roadway. Install

construction exits and tire wash area at the locations shown in the plans and in accordance with plan details.

Construction exit tire cleaning station shall be installed when conditions dictate additional tire cleaning measures

are necessary to assist in protecting public roadways. Tire cleaning station shall consist of two pressure washers,

water source and necessary labor and materials to clean tires of exiting vehicles. When conditions warrant the

use of the tire cleaning station or as directed by the Engineer, the Department will pay $750 dollars per day for the

use. The Contractor may submit other construction exit tire wash assembly and sediment storage methods for

review and approval by the Engineer.

Add the retrofit device to the permanent outlet structure as shown on the plan details.

When all land disturbing activities that would contribute sediment-laden runoff to the basin are complete, clean

the basin of sediment and stabilize the basin area with vegetation.

When the basin is stabilized, remove the retrofit device from the permanent outlet structure of the detention pond.

Inlet sediment traps consist of a temporary device placed around a storm drain inlet to trap sediment. An

excavated area adjacent to the sediment trap will provide additional sediment storage.

Inlet sediment traps may be constructed of Type C silt fence, plastic frame and filter, hay bales, baffle box, or

other filtering materials approved by the Engineer. Construct inlet sediment traps according to the appropriate

specification for the material selected for the trap. Place inlet sediment traps as shown on the plans or as directed

by the Engineer. 146146146146146146146146146146

Construct rock filter dams of the material selected as shown in the approved erosion and sediment control plan.

Construct and place this item in accordance with the approved erosion control construction detail(s) and Standard

Specification Section 603.

Rock filter dams shall remain in place until the permanent ditch protection is in place or is being installed and their

removal is approved by the Engineer.

Construct stone filter berms of the material selected as shown in the approved erosion and sediment control plan.

Construct and place this item in accordance with the approved erosion control construction detail(s) and Standard

Specification Section 603.

Stone filter berms shall remain in place until the permanent slope protection is in place or is being installed and

their removal is approved by the Engineer.

Construct stone filter rings of the material selected as shown in the approved erosion and sediment control plan.

Construct and place this item in accordance with the approved erosion control construction detail(s) and Standard

Specification Section 603.

A stone filter ring shall remain in place until final stabilization of the area which drains toward it is achieved and its

removal is approved by the Engineer.

Construct temporary sediment traps of the material selected as shown in the approved erosion and sediment

control plan. Construct and place this item in accordance with the approved erosion control construction detail(s)

and Standard Specification Section 603.

A temporary sediment trap shall remain in place until final stabilization of the area which drains toward it is

achieved and its removal is approved by the Engineer.

163.3.06 Quality Acceptance

General Provisions 101 through 150.

163.3.07 Contractor Warranty and Maintenance

General Provisions 101 through 150.

163.4Measurement

Silt control gates are measured for payment by the entire structure constructed at each location complete in place

and accepted. Silt control gates constructed at the inlet of multiple lines of drainage structures are measured for

payment as a single unit.

Temporary slope drains are measured for payment by the linear foot (meter) of pipe placed. When required, the

inlet spillway and outlet apron and/or other dissipation devices are incidental and not measured separately. 147147147147147147147147147147

Temporary sediment basins are measured for payment by the entire structure complete, including construction,

maintenance, and removal. Temporary grassing for sediment basins is measured separately for payment.

Measurement also includes:

• Earthwork

• Drainage

• Spillways

• Baffles

• Riprap

• Final cleaning to remove the basin

Sediment barriers are measured by the linear foot (meter).

Other temporary structures are not measured for payment. Costs for the entire structure complete, including

materials, construction (including earthwork), and removal is included in the price bid for the drainage structure or

for other Contract items.

Temporary grass is measured for payment by the acre (hectare). Lime, when required, is measured by the ton

(megagram). Mulch and fertilizer are measured separately for payment.

Mulch (straw or hay, or erosion control compost) is measured for payment by the ton (megagram).

These items are not measured for payment. The cost for construction, materials, and removal is included in the

price bid for other contract items.

Diversion channels are not measured for payment. The cost for the entire structure complete, including materials,

construction (including earthwork), and removal is included in the price bid for the drainage structure or for other

contract items.

Stone, sand bags, baled wheat straw, and compost filter sock check dams are measured per each, which

includes all work necessary to construct the check dam including woven plastic filter fabric placed beneath stone

check dams. Fabric check dams are measured per linear foot.

Construction exits are measured per each which will include all work necessary to construct the exit including the

required geotextile fabric placed beneath the aggregate.

Construction exit tire cleaning station are measured per day when added to an existing construction exit.

Measurement includes all work necessary to construct the construction exit tire cleaning station including

equipment, material, water source, and removal.

Retrofit will be measured for payment per each. The construction of the detention pond and permanent outlet

structure will be measured separately under the appropriate items.

Inlet sediment traps, regardless of the material selected, are measured per each which includes all work necessary

to construct the trap including any incidentals and providing the excavated area for sediment storage. 148148148148148148148148148148

Rock filter dams are measured for payment per each required. This includes the entire structure at each location

and all the work necessary for construction.

Stone filter berms are measured for payment per linear foot (meter) required. This includes the entire structure at

each location and all the work necessary for construction.

Stone filter rings are measured for payment per each required. This includes the entire structure at each location

and all the work necessary for construction.

Temporary sediment traps are measured for payment per each required. This includes the entire structure at each

location and all the work necessary for construction.

163.4.01 Limits

General Provisions 101 through 150.

163.5Payment

The specified silt control gates are paid for at the Contract Unit Price per each. Payment is full compensation for:

• Furnishing the material and labor

• Constructing the concrete apron as shown on the Plans

• Excavating and backfilling to place the apron

• Removing the gate

Temporary slope drains are paid for by the linear foot (meter). Payment is full compensation for materials,

construction, removal (if required), inlet spillways, velocity dissipaters, and outlet aprons.

When temporary drain inlets and pipe slope drains are removed, they remain the Contractor’s property and may

be reused or removed from the Project as the Contractor desires. Reused pipe or inlets are paid for the same as

new pipe or inlets.

Temporary sediment basins, measured according to Subsection 163.4,C Measurement, are paid for by the unit,

per each, for the type specified on the plans. Price and payment are full compensation for work and supervision to

construct, and remove the sediment basin, including final clean-up.

Sediment barriers are paid by the linear foot (meter). Price and payment are full compensation for work and

supervision to construct, and remove the sediment barrier, including final clean-up.

Other temporary structures are not measured for payment. Costs for the entire structure complete, including

materials, construction (including earthwork), and removal is included in the price bid for the drainage structure or

for other Contract items.

Temporary grass is paid for by the acre (hectare). Payment is full compensation for all equipment, labor, ground

preparation, materials, wood fiber mulch, polyacrylamide, and other incidentals. Lime (when required) is paid for

by the ton (megagram). Mulch and fertilizer are paid for separately. 149149149149149149149149149149

Mulch is paid for by the ton. Payment is full compensation for all materials, labor, maintenance, equipment and

other incidentals.

The weight for payment of straw or hay mulch will be the product of the number of bales used and the average

weight per bale as determined on certified scales provided by the Contractor or state certified scales. Provide

written documentation to the Engineer stating the average weight of the bales.

The weight of erosion control compost mulch will be determined by weighing each loaded vehicle on the required

motor truck scale as the material is hauled to the roadway, or by using recorded weights if a digital recording

device is used. The Contractor may propose other methods of providing the weight of the mulch to Engineer

for approval.

These items are not paid for separately. They are included in the price bid for other contract items.

Diversion channels are not paid for separately. They are included in the price bid for other contract items.

Payment is full compensation for all materials, construction, and removal. Stone plain riprap, sand bag, baled

wheat straw, or compost filter socks check dams are paid for per each. The required woven filter fabric required

under each stone check dams is included in the bid price. Fabric check dams are paid for per linear foot.

Construction exits are paid for per each. Payment is full compensation for all labor and materials including the

required geotextile, construction, and removal.

Construction exit tire cleaning stations are paid for per day when added to an existing construction exit. Payment

is full compensation for all labor, equipment, materials, water source, and removal.

This item is paid for at the Contract Unit Price per each. Payment is full compensation for all work, supervision,

materials (including the stone filter), labor and equipment necessary to construct and remove the retrofit device

from an existing or proposed detention pond outlet structure.

Inlet sediment traps are paid for per each. Payment is full compensation for all materials, construction,

and removal.

Rock filter dams are paid for per each. Payment is full compensation for all materials, construction, and removal

for each. Clean reused stone Type 3 riprap and #57 stone are paid for on the same basis as new items. Plastic

woven filter fabric is required under rock filter dams and is included in the price bid for each.

Stone filter berms are paid for per linear foot (meter). Payment is full compensation for all materials, construction,

and removal for each. Clean reused stone Type 3 riprap and #57 stone are paid for on the same basis as new

items. Plastic woven filter fabric is required under rock filter berms and is included in the price bid for linear

foot (meter).

Stone filter rings are paid for per each. Payment is full compensation for all materials, construction, and removal

for each. Clean reused stone Type 3 riprap and #57 stone are paid for on the same basis as new items. Plastic

woven filter fabric is required under stone filter rings and is included in the price bid for each. 150150150150150150150150150150

Temporary sediment traps are paid for payment per each required. This includes the entire structure at each

location and all the work necessary for construction.

The items in this section (except temporary grass and mulch) are made as partial payments as follows:

• When the item is installed and put into operation the Contractor will be paid 75 percent of the Contract price.

• When the Engineer instructs the Contractor that the item is no longer required and is to remain in place or is

removed, whichever applies, the remaining 25 percent will be paid.

Temporary devices may be left in place at the Engineer’s discretion at no change in cost. Payment for temporary

grass will be made based on the number of acres (hectares) grassed. Mulch will be based on the number of tons

Payment is made under:

Item No. 163 Construct and remove silt control gates Per each

Item No. 163 Construct and remove temporary pipe slope drains Per linear foot (meter)

Item No. 163 Construct and remove temporary sediment barriers Per linear foot (meter)

Item No. 163 Construct and remove sediment basins Per each

Item No. 163 Construct and remove check dams except fabric dams Per each

Item No. 163 Construct and remove fabric check dams Per linear foot (meter)

Item No. 163 Construct and remove construction exits Per each

Item No. 163 Construction exit tire cleaning station Per day

Item No. 163 Construct and remove retrofits Per each

Item No. 163 Construct and remove rock filter dams Per each

Item No. 163 Construct and remove stone filter berms Per linear foot (meter)

Item No. 163 Construct and remove stone filter rings Per each

Item No. 163 Construct and remove inlet sediment traps Per each

Item No. 163 Construct and remove temporary sediment traps Per each

Item No. 163 Temporary grass Per acre (hectare)

Item No. 163 Mulch Per ton (megagram)

163.5.01 Adjustments

General Provisions 101 through 150.. 151 151 151 151 151 151 151 151 151 151