6 SEC 315.pdf

Section 161—Control of Soil Erosion and Sedimentation

161.1 General Description

Specifications for this work will be included elsewhere in the Contract.

Section 162—Erosion Control Check Dams

162.1 General Description

This work includes furnishing, constructing, and maintaining erosion control check dams.

162.1.01 Definitions

General Provisions 101 through 150.

162.1.02 Related References

A. Standard Specifications

Section 810—Roadway Materials

B. Referenced Documents

General Provisions 101 through 150.

162.1.03 Submittals

General Provisions 101 through 150.

162.2 Materials

A. Erosion Control Materials

Use these materials as needed to control erosion on check dams:

1. Where required, use any commercial type of woven wire minimum 14 ½ gauge.

2. Obtain other materials such as logs, brush, stakes, etc., from the Right-of-Way where available.

3. Place Number 57 stone, where required, at the location and depth indicated on the Plans.

4. Ensure that material in the earth dams meets the requirements of Subsection 810.2.01.A.1, “Classes” for Class II soils.

162.2.01 Delivery, Storage, and Handling

General Provisions 101 through 150.

162.3 Construction Requirements

162.3.01 Personnel

General Provisions 101 through 150.

162.3.02 Equipment

General Provisions 101 through 150.

162.3.03 Preparation

General Provisions 101 through 150.

Section 162-Erosion Control Check Dams

162.3.04 Fabrication

162.3.05 Construction

A. Check Dam Construction

Construct check dams as follows:

1. Construct check dams before roadway clearing, grubbing, or grading is done in the affected drainage area. Construct according to the Plans.

2. Remove the trees, logs, brush, etc., within the Right-of-Way and the affected area that may be used to construct the check dams. Do not disturb other natural ground cover.

NOTE: Use only rubber-tired equipment to work in the affected drainage area until after the check dam is in place and completed.

3. Obtain the embankment material for the earth dams from outside the area draining into the protected pond or stream.

4. Immediately after completing the earthwork on the earth dams, place a layer of Number 57 stone on the downstream side of the dam. Immediately grass the remaining portions (top and upstream slopes) of the earth dams.

5. Immediately after grading, grass or stabilize with straw mulch roadway cut and fill slopes that drain toward the check dam drainage area.

6. Leave check dams in place after construction is complete unless otherwise directed by the Engineer.

162.3.06 Quality Acceptance

General Provisions 101 through 150.

162.3.07 Contractor Warranty and Maintenance

Repair the check dams as needed during the life of the Contract.

The estimated number of check dams required is shown on the Plans. Additional check dams may be necessary and shall be constructed when directed by the Engineer.

162.4 Measurement

The number of erosion control check dams measured for the payment is the actual number completed and accepted.

162.4.01 Limits

General Provisions 101 through 150.

162.5 Payment

Erosion control check dams, as measured in Subsection 162.4, “Measurement,” are paid for at the Contract Unit Price.

Payment is full compensation for:

Earth dam construction and compaction

Required grassing, mulching, and Number 57 stone

Log dams and dissipaters

Removal if ordered by the Engineer

Payment for this Item is made as follows:

75 percent of the Contract Price is paid when each erosion control check dam is complete in place.

25 percent is paid when the Engineer instructs the Contractor that the check dam is no longer required but will remain in place or be removed, whichever applies.

Section 162-Erosion Control Check Dams

NOTE: Temporary devices will be left in place at the Engineer’s discretion without a change in cost.

Payment will be made under:

Item No. 162 Erosion control check dam—type__ Per each

162.5.01 Adjustments

Section 163—Miscellaneous Erosion Control Items

163.1 General Description

This work includes constructing and removing:

Silt control gates

Temporary erosion control slope drains shown on the Plans or as directed

Sediment basins

Baled straw sediment barrier and check dams

Rock filter dams

Stone filter berms

Stone filter rings

Other temporary erosion control structures shown on the Plans or directed by the Engineer

This work also includes applying mulch (straw or hay, erosion control compost), and temporary grass.

163.1.01 Related References

A. Standard Specifications

Section 109—Measurement and Payment

Section 161—Control of Soil Erosion and Sedimentation

Section 171—Temporary Silt Fence

Section 500—Concrete Structures

Section 603—Rip Rap

Section 700—Grassing

Section 715—Bituminous Treated Roving

Section 720 – Triangular Silt Barrier

Section 800—Coarse Aggregate

Section 801—Fabrics

Section 822—Emulsified Asphalt

Section 860—Lumber and Timber

Section 863—Preservative Treatment of Timber Products

Section 890—Seed and Sod

Section 893—Miscellaneous Planting Materials

Section 163-Miscellaneos Erosion Control Items

B. Referenced Documents

AASHTO M252

AASHTO M294

163.1.02 Submittals

Provide written documentation to the Engineer as to the average weight of the bales of mulch.

163.2 Materials

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

Bituminous Treated Roving 715

Triangular Silt Barrier 720

Lumber and Timber 860.2.01

Preservative Treatment of Timber Products 863.1

Corrugated Polyethylene Temporary Slope Drain Pipe AASHTO M252 or M294

163.2.01 Delivery, Storage, and Handling

General Provisions 101 through 150.

163.3 Construction 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.

163.3.05 Construction

A. Silt Control Gates

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

1. Clear and grade only that portion of the roadway within the affected drainage area where the drainage structure will be constructed.

2. Construct or install the drainage structure and backfill as required for stability.

3. Install the silt control gate at the inlet of the structure. Use the type indicated on the Plans.

4. Vary the height of the gate as required or as shown on the Plans.

5. Finish grading the roadway in the affected drainage area. Grass and mulch slopes and ditches that will not be paved.

Construct the ditch paving required in the affected area.

6. Keep the gate in place until the work in the affected drainage area is complete and the erodible area is stabilized.

7. Remove 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.

B. Temporary Slope Drains

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

1. Place temporary pipe slope drains with inlets and velocity dissipaters (straw bales, silt fence, or aprons) according to the Plans.

2. Securely anchor the inlet into the slope to provide a watertight connection to the earth berm. Ensure that all connections in the pipe are leak proof.

3. Place temporary slope drains at a spacing of 350 ft (105 m) maximum on a 0% to 2% grade and at a spacing of 200 ft (60m) maximum on steeper grades, or more frequently as directed by the Engineer. Keep the slope drains in place until the permanent grass has grown enough to control erosion.

4. Remove the slope drains and grass the disturbed area with permanent grass. However, the temporary slope drains may remain in place to help establish permanent grass if approved by the Engineer.

C. Sediment Basins

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

1. Construct the unit complete as shown, including:

Grading

Drainage

Rip rap

Spillways

Anti-seep collar

Temporary mulching and grassing on internal and external slopes

Accessories to complete the basin

2. When the sediment basin is no longer needed, remove and dispose of the remaining sediment.

3. Remove the sediment basin. Grade to drain and restore the area to blend with the adjacent landscape.

4. Mulch and permanently grass the disturbed areas according to Section 700.

D. Sediment Barrier (baled straw)

Construct sediment barrier (baled straw) according to the Plan details. Use rectangular, standard size baled straw in mechanically produced bales.

The following items may be substituted for sediment barrier (baled straw)

1. Type B Silt Fence.

2. Triangular Silt Barrier.

3. Synthetic Fiber: Use synthetic fiber bales of circular cross section at least 18 in (450 mm) in diameter. Use 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 continuous roll of the desired total length. Use bales that are enclosed in a geotextile fabric and that contain a pre-made stake hole for anchoring.

4. Coir: Use coir fiber bales of circular cross section at least 16” (400mm) in diameter. Use coir bales of 10 ft, 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 (112 kg/m

). Anchor in place with 2 in X 4 in (50 mm

X 100 mm) wooden wedges with a 6 in (150 mm) nail at the top. Place wedges no more than 36 in (900 mm) apart.

5. Excelsior: Use curled aspen excelsior fiber with barbed edges in circular bales of at least 18 in (450 mm) in diameter 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 (22 kg/m

). 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).

6. Compost Filter Sock: Use general use compost (see Subsection 893.2.02.A.5.b) in circular bales at least 18 in diameter. Use compost baled with photo-degradable plastic mesh 3 mils thick with a maximum 0.25 in X 0.25 in (6 mm X 6 mm) openings. 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). 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 of fertilizer is restricted.

7. Compost Filter Berm: Use erosion control compost (see Subsection 893.2.02) to construct an uncompacted 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:

a. Keeping the berm in a functional condition.

b. Installing additional berm material when necessary.

c. Removing the berm when no longer required, as determined by the Engineer. At the Engineer’s discretion, berm material may be left to decompose naturally, or distributed over the adjacent area.

E. Other Temporary Structures

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

F. Temporary Grass

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:

1. Use seeds that conform to Subsection 890.2.01, “Seed.” Perform seeding according to Section 700; except use the minimum ground preparation necessary to provide a seed bed if further grading is required.

2. Prepare areas that require no further grading according to Subsection 700.3.05.A, “Ground Preparation.” 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.

3. Apply mixed grade fertilizer at 400 lbs/acre (450 kg/ha). Omit the nitrogen. Mulch (with straw or hay) temporary grass according to Section 700. (Erosion control compost Mulch will not be allowed with grassing.)

4. Before planting permanent grass, thoroughly plow and prepare areas where temporary grass has been planted according to Subsection 700.3.05.A, “Ground Preparation”.

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

6. Apply Pam (powder) before grassing or PAM (emulsion) to the hydroseeding operation.

7. Apply PAM according to manufacturer specifications.

8. Use only anionic PAM.

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

Blanket requirements.

G. Mulch

When stage 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:

1. Mulch (Hay or Straw) - Without Grass Seed

a. Uniformly spread the mulch over the designated areas from 2 in to 4 in (50 mm to 100 mm) thick.

b. After 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.

c. Place temporary mulch on slopes as steep as 2:1 by using a tracked vehicle to imbed the mulch into the slope.

d. When grassing operations begin, leave the mulch in place and plow the mulch into the soil during seed bed preparation. The mulch will become beneficial plant food for the newly planted grass.

2. Erosion control compost - Without Grass Seed

a. Uniformly spread the mulch (erosion control compost) over the designated areas 2 in (50 mm) thick.

b. When rolling is necessary, or directed by the Engineer, use a light corrugated drum roller.

c. When grassing operations begin, leave the mulch in place and plow the mulch into the soil during seed bed preparation. The mulch will become beneficial plant food for the newly planted grass.

d. Plant temporary grass on area stabilized with mulch (erosion control compost) after 60 calendar days.

e. Do not use Erosion Control Compost in areas where the use of fertilizer is restricted.

H. Miscellaneous Erosion Control Not Shown on the Plans

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.

I. Diversion Channels

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

J. Temporary Check Dams

Temporary check dams are constructed of the following materials;

Stone plain rip rap according to Section 603 or of sand bags as in Section 603 without Portland cement. (Place plastic filter fabric on ditch section before placing rip rap.)

Fabric (Type C silt fence)

Hay Bales

Temporary 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.

K. Construction Exits

Locate construction exits at any point where vehicles will be leaving the project onto a public roadway. Install construction exits at the locations shown in the plans and in accordance with plan details.

L. Retrofit

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.

M. Inlet Sediment Trap

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.

N. Rock Filter Dams

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.

O. Stone Filter Berms

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

P. Stone Filter Rings

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 http://tomcat2.dot.state.ga.us/thesource/pdf/specs/ss603.html

163.3.06 Quality Acceptance

163.3.07 Contractor Warranty and Maintenance

General Provisions 101 through 150.

163.4 Measurement

A. Silt Control Gates

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.

B. Temporary Slope Drains

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.

C. Sediment Basins

Sediment basins are measured for payment by the entire structure complete, including construction, maintenance, and removal. Measurement also includes:

Earthwork

Drainage

Spillways

Baffles

Rip rap

Final cleaning to remove the basin

Permanent and temporary grassing for sediment basins is measured separately for payment.

D. Diversion Channels

Diversion channels 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.

E. Temporary Grass

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.

F. Mulch

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

G. Baled Straw Sediment Barrier, Baled Straw Check Dam and Fabric Check Dams

Baled straw sediment barrier, baled straw check dams, and fabric check dams are measured by the linear foot (meter).

When the Contractor substitutes a product allowed in Subsection 163.3.05.D for baled straw sediment barrier or when the

Engineer directs this substitution, the product will be measured by the linear foot (meter).

H. Rip Rap Check Dams

Rip Rap Check Dams are measured per each which will include all work necessary to construct the check dam including plastic filter fabric placed beneath the rip rap or sand bags.

I. Construction Exits

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.

J. Retrofit

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.

K. Inlet Sediment Trap

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.

L. Rock Filter Dams

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.

M. Stone Filter Berms

Stone filter berms are measured for payment per each required. This includes the entire structure at each location and all the work necessary for construction.

N. Stone Filter Rings

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.

163.4.01 Limits

General Provisions 101 through 150.

163.5 Payment

A. Silt Control Gates

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

B. Temporary Slope Drains

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.

C. Sediment Basin

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.

D. Diversion Channel

Diversion channels are not paid for separately; they are included in the price bid for the drainage structure or for other

Contract Items.

E. Temporary Grass

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.

F. Mulch

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.

G. Baled Straw Sediment barrier, Baled Straw Check Dams and Fabric Check Dams (Type C Silt Fence)

Baled straw sediment barrier, baled straw check dams and fabric check dams (type C silt fence), complete in place and accepted are paid for at the Contract Unit Price bid per linear foot (meter). Payment is full compensation for constructing, and removing (when directed) the baled straw sediment barrier or either check dam.

When the Contractor substitutes any product allowed in Subsection 163.3.05.D for baled straw sediment barrier or when the Engineer directs this substitution, payment is made at the bid price per linear foot (meter) for baled straw sediment barrier.

H. Rip Rap Check Dams

Rip Rap Check Dams are paid for per each. Payment is full compensation for all materials, construction, and removal.

Reused stone plain rip rap or sandbags are paid for on the same basis as new items. Filter fabric required under rip rap check dams is included in the price bid for each check dam.

I. Construction Exits

Construction exits are paid for per each. Payment is full compensation for all materials including the required geotextile, construction, and removal.

J. Retrofit

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.

K. Inlet Sediment Trap

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

L. Rock Filter Dams

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.

M. Stone Filter Berms

Stone filter berms 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 berms and is included in the price bid for each.

N. Stone Filter Rings

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.

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 (megagrams) used.

Payment is made under:

Item No. 163 Construct and remove silt control gate, type__ Per each

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

Item No. 163 Construct and remove temporary sediment barrier or baled straw check dam

Per linear foot (meter)

Item No. 163 Construct and remove sediment basin type__, Sta. No.___ Per each

Item No. 163 Construct and remove Fabric Check Dam - type C silt fence Per linear foot (meter)

Item No. 163 Construct and remove Rip Rap Check Dams ,Stone Plain Rip Rap/Sand Bags

Per Each

Item No. 163 Construction exit Per each

Item No. 163 Construct and remove retrofit, Sta. No.____ Per each

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

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

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

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

Item No. 163 Temporary grass Per acre (hectare)

Item No. 163 Mulch Per ton (megagram)

163.5.01 Adjustments

Section 165—Maintenance of Temporary Erosion and Sedimentation

Control Devices

165.1 General Description

This work consists of providing maintenance on temporary erosion and sediment control devices, including but not limited to the following:

Silt fence

Sediment basins

Silt control gates

Check dams

Silt retention barriers

Rock filter dams

Stone filter berms

Stone filter rings

It also consists of removing sediment that has accumulated at the temporary erosion and sediment control devices.

165.1.01 Definitions

General Provisions 101 through 150.

165.1.02 Related References

A. Standard Specifications

General Provisions 101 through 150.

B. Referenced Documents

General Provisions 101 through 150.

165.1.03 Submittals

General Provisions 101 through 150

165.2 Materials

General Provisions 101 through 150.

165.2.01 Delivery, Storage, and Handling

General Provisions 101 through 150.

165.3 Construction Requirements

165.3.01 Personnel

General Provisions 101 through 150.

165.3.02 Equipment

General Provisions 101 through 150.

165.3.03 Preparation

Section 165-Maintenance of Temporary Erosion and Sedimentation Control Devices

165.3.04 Fabrication

165.3.05 Construction

A. General

As a minimum, clean the sediment from all temporary erosion control devices (except sediment basins) installed on the project when one half the capacity, by height, depth or volume has been reached. Clean the sediment from all temporary sediment basins installed on a project when one third the capacity of the storage volume has been filled.

Handle sediment excavated from any erosion or sediment control device in one of the following ways:

Remove sediment from the immediate area and immediately stabilize it to prevent the material from refilling any erosion or sediment control device.

Place and mix it in the roadway embankment, or waste it in an area approved by the Engineer.

Repair or replace at no cost to the Department, any erosion or sediment control devices that are not functioning properly or are damaged due to negligence or abuse.

B. Temporary Silt Fence

Maintenance of Temporary Silt Fence consists of furnishing all labor, tools, materials, equipment and necessary incidentals to remove and dispose of accumulated sediment down to the original ground line (0 % filled). Also included is the removal of sediment accumulations (“filtercake”) on the fabric by tapping the fabric on the downstream side.

C. Silt Control Gates

Maintenance of Temporary Silt Control Gates consists of all labor, tools, materials, equipment and necessary incidentals to remove and dispose of accumulated sediment down to the original ground line (0% filled). When applicable, this item will include the removal of sediment accumulations on the fabric by tapping the fabric on the downstream side.

D. Check Dams (all types)

Maintenance of Temporary Erosion Control Check Dams shall consist of all labor, tools, materials, equipment and necessary incidentals to remove and dispose of accumulated sediment down to the original ground line (0% filled). This item also includes the removal of any material deposited in sump holes. When applicable, this item will include the removal of sediment accumulations on the fabric by tapping the fabric on the downstream side, or from the baled straw by similar means.

E. Silt Retention Barrier

Maintenance of Temporary Silt Retention Barrier consists of all labor, tools, materials, equipment and necessary incidentals to remove and dispose of accumulated sediment down to the original ground line (0% filled).

F. Temporary Sediment Basins

Maintenance of Temporary Sediment Basins consists of all labor, tools, materials, equipment and necessary incidentals to remove and dispose of accumulated sediment down to the original bottom of the basin. This also includes removing accumulated sediment from the rock filter and restoring the rock filter to its original specified condition and any work necessary to restore all other components to the pre-maintenance conditions.

G. Sediment Barrier (baled straw)

Maintenance of sediment barrier (baled straw) consists of furnishing all labor, tools, materials, equipment and necessary incidentals to remove and dispose of accumulated sediment down to the original ground line (0 % filled). Also included is the removal of sediment accumulations on the bales by tapping.

H. Triangular Silt Barrier

Maintenance of Triangular Silt Barrier consists of all labor, tools, materials, equipment and necessary incidentals to remove and dispose of accumulated sediment down to the original ground line (0% filled).

I. Retrofit:

Maintenance of the retrofit device consists of all labor, tools, materials, equipment and necessary incidentals to remove and properly dispose of accumulated sediment in the permanent detention pond being utilized as a temporary sediment basin. This item also includes any maintenance that is required to ensure the retrofit device is maintained per Plan details and any maintenance of the stone filter to maintain its filtering ability, including cleaning and replacement.

J. Construction Exit:

Maintenance of the construction exit consists of all labor, tools, materials, equipment and incidentals, including additional stone and geotextile fabric as required to prevent the tracking or flow of soil onto public roadways. This includes, scarifying existing stone, cleaning existing stone, or placement of additional stone.

Cleaning of the construction exit by scraping and/or brooming only will not be measured for payment.

K. Inlet Sediment Trap

Maintenance of inlet sediment traps consists of all labor, tools, materials, equipment and necessary incidentals to remove and properly dispose of accumulated sediment in the trap and/or the excavated area adjacent to the trap. It also includes any maintenance that is required to remove sediment accumulations (“filtercake”) from the material selected to construct the inlet sediment trap.

L. Rock Filter Dams

Maintenance of rock filter dams consists of all labor, tools, materials, equipment, and necessary incidentals to remove and dispose of accumulated sediment down to the original ground line (0% filled). This item also includes the removal of any material deposited in sump holes.

M. Stone Filter Berms

Maintenance of stone filter berms consists of all labor, tools, materials, equipment, and necessary incidentals to remove and dispose of accumulated sediment down to the original ground line (0% filled). This item also includes the removal of

N. Stone Filter Rings

Maintenance of stone filter rings consists of all labor, tools, materials, equipment, and necessary incidentals to remove and dispose of accumulated sediment down to the original ground line (0% filled). This item also includes the removal of

165.3.06 Quality Acceptance

165.3.07 Contractor Warranty and Maintenance

165.4 Measurement

A. Temporary Silt Fence:

Maintenance of temporary silt fence, Type A, B, or C, is the actual linear feet (meter) of silt fence, measured in place, where sediment is removed.

B. Silt Control Gates:

Maintenance of temporary silt control gates, type I, II, III or IV, as specified on the Plans, is measured as a single unit.

C. Check Dams (All Types):

Maintenance of temporary erosion control check dams as specified on the Plans is the actual linear feet (meter) of baled straw, type c silt fence or rip rap, measured in place, where sediment is removed.

D. Silt Retention Barrier:

Maintenance of temporary silt retention barrier as specified on the Plans, is measured by the linear foot (meter) where sediment is removed.

E. Temporary Sediment Basins:

Maintenance of temporary sediment basins as specified on the Plans, is measured as a single unit.

F. Sediment Barrier (baled straw)

Maintenance of sediment barrier (baled straw), is the actual linear feet (meter) of baled straw measured in place, where sediment is removed.

G. Triangular Silt Barrier:

Maintenance of triangular silt barrier as specified on the plans, is measured by the linear foot (meter) where sediment is removed.

H. Retrofit:

Maintenance of retrofit device at the location specified on the Plans is measured per each.

I. Construction Exit:

Maintenance of construction exit at the location specified on the Plans, or as directed by the Engineer is measured per each.

J. Inlet Sediment Trap

Maintenance of inlet sediment trap at the location specified on the Plans, or as added by the Engineer is measured per each.

K. Rock Filter Dams

Maintenance of rock filter dams as specified on the plans is measured as a single unit.

L. Stone Filter Berms

Maintenance of stone filter berms as specified on the plans is measured as a single unit.

M. Stone Filter Rings

Maintenance of stone filter rings as specified on the plans is measured as a single unit.

165.4.01 Limits

165.5 Payment

A. Temporary Silt Fence:

Maintenance of temporary silt fence, Type A, B, or C, is paid for at the contract unit price bid per linear foot (meter).

B. Silt Control Gates:

Maintenance of temporary silt control gates, Type I, II, III, or IV as specified on the Plans is paid for at the contract unit price bid per each.

C. Check Dams (All Types):

Maintenance of Check Dams as specified on the Plans is paid for at the contract unit price bid per linear foot (meter).

D. Silt Retention Barrier:

Maintenance of temporary silt retention barrier as specified on the Plans is paid for at the contract unit price bid per linear foot (meter).

E. Temporary Sediment Basins:

Maintenance of temporary sediment basins as specified on the Plans is paid for at the contract unit price bid per each.

F. Sediment Barrier (baled straw):

Maintenance of sediment barrier (baled straw) as specified on the Plans is paid for at the contract unit price bid per linear foot (meter).

G. Triangular Silt Barrier:

Maintenance of triangular silt barrier as specified on the Plans is paid for at the contract unit price bid per linear foot

(meter).

H. Retrofit:

Maintenance of the retrofit device at the location specified on the Plans is paid for at the contract unit price bid per each.

I. Construction Exit:

Maintenance of the construction exit at the location specified on the Plans or as added by the Engineer is paid for at the contract unit price per each.

J. Inlet Sediment Trap

Maintenance of the inlet sediment trap at the location specified on the Plans or at the location specified by the Engineer is paid for at the contract unit price per each.

K. Rock Filter Dams

Maintenance of rock filter dams as specified on the plans is paid for at the contract unit price bid per each.

L. Stone Filter Berms

Maintenance of stone filter berms as specified on the plans is paid for at the contract unit price bid per each.

M. Stone Filter Rings

Maintenance of stone filter rings as specified on the plans is paid for at the contract unit price bid per each.

Payment will be made under:

Item No. 165 Maintenance of temporary silt fence Type____ per linear foot (meter)

Item No. 165 Maintenance of silt control gate Type ____ per each

Item No. 165 Maintenance of check dams (all types) per linear foot (meter)

Item No. 165 Maintenance of silt retention barrier per foot (meter)

Item No. 165 Maintenance of temporary sediment basin, Sta. No. ____ per each

Item No. 165 Maintenance of sediment barrier (baled straw) per linear foot (meter)

Item No. 165 Maintenance of triangular silt barrier per linear foot (meter)

Item No. 165 Maintenance of retrofit, Sta. No.____ per each

Item No. 165 Maintenance of construction exit per each

Item No. 165 Maintenance of inlet sediment trap per each

Item No. 165 Maintenance of rock filter dam per each

Item No. 165 Maintenance of stone filter berm per linear foot (meter)

Item No. 165 Maintenance of rock filter dam per each

165.5.01 Adjustments