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General Provisions (00100-00999)

901— EROSION, SEDIMENT, AND STORMWATER MANAGEMENT

DE · 2025 Standard SpecificationsBook pages 583–595View official source ↗

EROSION, SEDIMENT, AND STORMWATER MANAGEMENT SECTION 901

573 DIVISION 900 — EROSION, SEDIMENT, AND STORMWATER MEASURES

901.1Description.

This work consists of implementing erosion and sediment control and stormwater management practices and techniques. 901.1.1 Definitions.

A.Daily Oversight – Review of project limits and guidance of construction personnel involved in land

disturbing activities.

B.Disturbed Area – An area where the contractor has disturbed the land, while performing the work,

and that may result in accelerated stormwater runoff and soil erosion.

C.Erosion, Sediment, and Stormwater Management (ES2M) Inspections – Compliance inspections of

the project site.

D.ES2M Certified Construction Site Reviewer (CCR) – An inspector of sediment and stormwater

controls certified by the Department of Natural Resources and Environmental Control (DNREC) and as appointed by the engineer.

E.Responsible Person – A foreman or superintendent in charge of on -site clearing and land

disturbing activities and for sediment and stormwater control.

F.Sediment and Stormwater Management Plan – The plan contained in the contract describing the

control of soil erosion, sedimentation, stormwater quantity, and water quality impacts resulting from land disturbing activities on the project.

G.Stormwater Pollution Prevention Plan (SWPPP) – The pollution prevention notes and details

contained in the Sediment and Stormwater Management Plan.

901.2Materials.

Not applicable.

901.3Construction.

901.3.1 Legal Authority.

A.Comply with:

1.Chapters 40 and 60 of Title 7 of the Delaware Code;

2.Title 7 Natural Resources and Environmental Control Delaware Administrative Code 7201

Regulations Governing Control of Water Pollution, Section 9;

3.Title 7 Natural Resources and Environmental Control Delaware Administrative Code 5101

Sediment and Stormwater Regulations; and

4.The NPDES General Permit Program for Stormwater Discharges Associated with Construction

Activities.

5.https://dnrec.alpha.delaware.gov/watershed -stewardship/sediment -stormwater/

EROSION, SEDIMENT, AND STORMWATER MANAGEMENT SECTION 901

574 901.3.2 Contractor Responsibility.

A.Install and maintain Stormwater Management Facilities and Post -Construction Stormwater

Management systems in accordance with the Sediment and Stormwater Management Plan.

B.Comply with the requirements of Chapter 60 of Title 7 including the current Delaware

Construction General Permit.

C.Provide documentation to certify that the responsible person, defined in Section 901.1.E.,

successfully completed the DNREC Contractor Training Program (Blue Card) before beginning land disturbing activities.

D.Ensure that the responsible person oversees implementation of the Sediment and Stormwater

Management Plan and provides daily oversight and guidance to construction personnel during land disturbing activities.

E.Provide property owner consent and an approved Erosion & Sediment Control Plan prior to use of

offsite stockpiling.

F.The contractor may be subject to violations or fines received from regulatory agencies as a result

of site conditions.

G.Co-Permitting

1.For contracts involving land disturbing activities subject to the provisions of Section 901.3.1, file

as a Co -Permittee on the original Notice of Intent under DNREC ’'s Construction General Permit for the project. File as a Co -Permittee after receipt of the contract award notice as a condition of contract execution. Upon contract execution, assume responsibility for implementing and complying with the approved Sediment an d Stormwater Management Plan.

2.In accordance with DNREC’s Construction General Permit, install notice of permit coverage as

directed by the engineer. The notice will be legible, publicly accessible, and protected from the weather. Posting of permit coverage and maintenance is incidental to the contract.

3.Co-Permittee permit coverage will not be terminated until final stabilization has been accepted

by the Department and the Division of Maintenance and Operations has issued the final project acceptance letter. Permit fees are annual, charged on July 1.

H.Designate a certified Erosion & Sediment Control (ESC) supervisor who:

1.Is a foreperson or superintendent;

2.is the responsible person for land disturbing activities;

3.provides daily oversight and guidance for implementing and maintaining the Sediment and

Stormwater Management Plan, corrects deficiencies, and coordinates deviations from the approved plan for redline plan preparation and approval;

4.completes the required daily Erosion & Sediment Control oversight;

5.accompanies DelDOT's ES2M CCR on ES2M Inspections;

6.attends the Erosion and Sediment pre -construction meeting, if held, and exchanges contact

information with the ES2M CCR;

7.possesses and maintains a DNREC certified Blue Card or a DNREC certified CCR card for the

project duration; and EROSION, SEDIMENT, AND STORMWATER MANAGEMENT SECTION 901

575 8. contacts the ES2M CCR a minimum of 48 hours before land disturbing activities begin to schedule an initial inspection of perimeter controls for the next phase. 901.3.3 Maintain Erosion and Sediment Control Measures. Maintain erosion and sediment control items continuously throughout the project duration, including periods when the project is inactive or suspended. Repair, replace, or maintain erosion and sediment control devices promptly as noted during the ES2M Inspe ction or as directed by the engineer. Maintain erosion and sediment control devices until construction phasing or stabilization allow the removal of those controls as determined by the engineer. 901.3.4 Failure to Implement or Maintain Erosion and Sediment Control Measures. If the contractor fails to perform the work as described in the approved Sediment and Stormwater Management Plan, the ES2M Report, or in writing from the engineer, the engineer may take any or all of the actions described in Sections 105.1 and 105.13, incl uding suspending all or part of the work, withholding progress payments, or performing maintenance with DelDOT forces, or third party forces, and deducting the costs from monies due or to become due to the contractor. 901.3.5 Fines Resulting from Non -Compliance. If the DNREC, the Army Corps of Engineers, or the EPA fine the Department as a result of the contractor's failure to implement and maintain the Sediment and Stormwater Management Plan and SWPPP, the Department will require the contractor to pay the fines d irectly or the Department will deduct the fines from monies due the contractor.

901.4Method of Measurement.

The Department will not measure this item.

901.5Basis of Payment.

The Department will consider costs associated with the provisions in this Section 901 as incidental to the contract.

PUMPING OR DEWATERING OPERATIONS SECTION 902 576 SECTION 902 — PUMPING OR DEWATERING OPERATIONS

902.1Description.

A.Statewide General Permit for Minor Dewatering Activities

1.Comply with the Statewide General Permit issued to the Department by DNREC via the

interagency Memorandum of Agreement. Covered work includes the following activities:

a.Dewatering.

i.Dewater the work area in accordance with this specification at rates less than 50,000 gallons

per day.

b.Stream By -pass Pumping.

i.By-pass surface water to facilitate in -stream work for bridge and culvert replacements. By -

pass pumping at rates exceeding 50,000 gallons per day are permitted provided no water is withdrawn for consumptive use and all water is returned to its natural course immediately downstream of the work area.

B.Permits Required

1.Obtain a separate dewatering permit from DNREC when groundwater or surface water

withdrawal rates in excess of 50,000 gallons per day are necessary.

a.Permit Acquisition

i.Obtain all necessary permits for dewatering and disposal of pumped water required to

construct and complete the Work from DNREC, Division of Water, Water Supply Section, unless covered in the Statewide General Permit for Minor Dewatering Activities.

b.Permit Acquisition Time

i.Dewatering permits for rates exceeding 1,000,000 gallons per day require public notice and

possibly a public hearing before DNREC will issue a permit. Ensure that sufficient permit acquisition time is included in the project schedule to obtain the permit. Time extensions will not be granted for failure to account for this time in the Project Schedule.

c.Other Permits.

i.State and Federal permits are required for any entry into streams or wetlands.

Environmental requirements are more fully described in the Project Environmental Statement. ii. The Statewide General Permit for Minor Dewatering Activities does not constitute approval, exemption, or waiver from any other law, rule, or regulation that may apply to the work shown in the plans or the activities necessary to complete the work. See Specification Section 107.2.

d.Licensing Requirements.

i.Meet any and all DNREC licensing requirements for the installation or operation of the

dewatering equipment, or employ the services of properly licensed subcontractors such as a well driller when an individual dewatering permit is required. PUMPING OR DEWATERING OPERATIONS SECTION 902 577 902.2 Material. Provide materials as necessary and required.

902.3Construction.

A.Submit approved permits

1.Submit copies of all permit approvals to the engineer. Dewatering operation cannot begin until

the necessary dewatering permit is submitted to the engineer.

B.Dewatering Equipment

1.Provide sufficient equipment and back -up or replacement equipment necessary to ensure the

continuous dewatering of the work area. Instantaneous and totalizing flow meters, accurate to within +/ - 5 percent, are required on all dewatering equipment.

C.Required Notifications

1.Notify the DNREC Water Supply Section at (302) 739 -9945, 48 -hours prior to starting any

dewatering operations.

2.Notify DNREC Wetlands and Subaqueous Lands Section at (302) 739 -9943, 48 -hours prior to

starting any dewatering adjacent to wetlands or if discharge water is proposed to be directed to any wetlands.

D.Dewatering Operation

1.Do not allow surface and ground water to rise around the proposed work. Continue dewatering

until the work has been brought to finished lines and grades and accepted by the engineer. None of the proposed work shown on the plans will be laid in water, unless otherwise indicated on the plans or directed by the engineer.

E.Protection of Work A rea

1.Install clean water diversions outside excavation limits to prevent the flow of surface water from

undisturbed areas into open excavations using any combination of berms, pipes, dikes, pumps, etc. in order to establish a clean water diversion. Comply with applicable sediment control measures.

F.Protect Adjacent Property

1.Dispose of pumped water into a suitable conveyance system without flooding or damage to

adjacent property, buildings, structures, utilities, and other work. Protect adjacent structures and property from any damage that may occur as a result of settlement o r other effects related to the removal of ground water and lowering of the water table. Do not drain dewatering discharge into work completed or under construction without prior consent of the engineer. Dispose of water in such a manner as not to be a m enace to the public health. Discharging to the sanitary sewer system is not permitted.

G.Protect Adjacent Waterbodies

1.Discharge of saline water into a fresh water system or discharge of fresh water into a saline

water system is prohibited. Dewatering operations for the project cannot cause the inadvertent drawdown or dewatering of wetlands or other surface water bodies.

H.Dewatering Discharge

PUMPING OR DEWATERING OPERATIONS SECTION 902 578 1. Ensure all discharges are directed to sediment trapping or filtering devices such as a dewatering bag, dewatering basin, portable sediment tank, sediment trap, or sediment basin prior to release into ditches, storm drain systems, streams, or surface water bodies of any type.

I.Dewatering of Temporary Cofferdams for Bridge Construction.

1.Upon completion of driving of temporary sheet pile for in -stream work, or erection of a

temporary dike to create a temporary cofferdam, leave the sediment -laden water within the cofferdam undisturbed for a minimum of 12 -hours to allow settling of suspended soil particles. Remove water from temporary cofferdams by skimming it off the surface. Immerse intake no more than 6 inches below the water surface. Once the water level has bee n pumped down, accomplish additional dewatering using a sump pit constructed in conformance with DelDOT Standard Construction Details. Any deviation from Standard Construction Details requires prior approval and may require an individual dewatering permit from DNREC.

J.Well Impacts .

1.As required by Title 7, Del.C., §6031 and §6037, take whatever steps are necessary to provide

continuous uninterrupted water service to any affected public or private potable water supplies or wells within the project area if adversely affected by the dewa tering operations associated with this project.

902.4Method of Measurement.

Pumping or Dewatering operations will not be separately measured.

902.5Basis of Payment.

A.Pumping or Dewatering operations will not be separately paid. All costs are incidental to the

associated work i tems .

B.Permit costs will not be separately paid for the acquisition of separate dewatering permits from

DNREC.

POLLUTION PREVENTION SECTION 903 579 SECTION 903 — POLLUTION PREVENTION

903.1Description.

This work consists of implementing and maintaining the pollution prevention plan outlined in the contract.

903.2Materials.

Not applicable.

903.3Construction.

903.3.1 Application Law and Regulations. Follow the Delaware Erosion and Sediment Control Handbook. https://dnrec.alpha.delaware.gov/watershed -stewardship/sediment -stormwater 903.3.2 Prohibited Discharges.

A.Wastewater from concrete washout operations, unless managed by an appropriate control;

B.Wastewater from stucco washout, paint, form release oils, curing compounds, and other

construction materials, unless managed by an appropriate control;

C.Fuels, oils, or other pollutants used in vehicle and equipment operation and maintenance;

D.Soaps, solvents, or detergents used in vehicle and equipment washing; and

E.Toxic or hazardous substances from a spill or other release.

903.3.3 Maintenance.

A.Inspect pollutant -generating activities and the pollution prevention Best Management.

1.Immediately upon discovery of spilled pollutants, initiate clean -up operations.

2.Do not hose down surfaces, use dry clean -up methods only.

903.4Method of Measurement.

Not applicable.

903.5Basis of Payment.

The Department will consider the cost of pollution prevention as incidental to the associated work items. The Department will make no separate payment for pollution prevention activities. SEDIMENT TRAPPING DEVICES SECTION 905 580 SECTION 905 — SEDIMENT TRAPPING DEVICES

905.1Description.

This work consists of constructing facilities to trap sediment before it leaves the job site.

905.2Materials.

A.Silt Fence

1.Wood Section 1041

2.Geotextile Section 1060

B.Reinforced Silt Fence

1.Wood Section 1041

2.Geotextile Section 1060

3.2” x 4”, 14 Gage Wire Mesh

C.Sediment Trap

1.Stone; Delaware No. 3 Section 1004

2.Riprap Section 1006

3.Wood Section 1041

4.Compost Filter Log Section 907.2.C

D.Inlet Sediment Control, Drainage Inlet

1.Geotextile Section 1060

2.Fence Section 1061

3.Steel Posts Section 1039

E.Inlet Sediment Control, Curb Inlet

1.Geotextile Section 1060

1.Compost Filter Log Section 907.2.C

E.Inlet Sediment Control, Culvert Inlet

1.Stone; Delaware No. 3 Section 1004

2.Riprap Section 1006

3.Wood Section 1041

4.Compost Filter Log Section 907.2.C

5.Geotextile Section 1060

A.Super Silt Fence

1.Steel Posts Section 1039

2.Geotextile Section 1060

SEDIMENT TRAPPING DEVICES SECTION 905 581 3. Fence Section 1061

905.3Construction.

A.Direct stormwater runoff from disturbed areas to an approved sediment control measure before

releasing the runoff from the project limits. Inspect weekly and immediately after every rainfall to maintain and make repairs as needed. Use the following sediment trapping devices.

B.Silt Fences:

1.Silt fence

a.Place fence in accordance with the Standard Construction Details.

b.Install a reinforcement strip at the geotextile roll ends.

c.Overlap geotextile a minimum of 6 -inches at post locations.

d.On slopes, turn the terminal ends of silt fence upslope enough to eliminate flow around the

ends of the silt fence.

e.Do not construct the silt fence across ditches, swales, or other areas of concentrated water

flow.

2.Reinforced silt fence

Place fence in accordance with the Standard Construction Details and Section 905.3.A. Fasten wire mesh to the posts between the geotextile and the posts.

3.Super Silt Fence

Place fence in accordance with the Standard Construction Details and Section 905.3.A. Fasten geotextile to chain link fence with ties spaced every 24 -inches at the top and midsection.

4.Maintenance

a.Repair or replace damaged geotextile until the silt fence is no longer necessary as determined

by the engineer.

b.Replace deteriorated or clogged geotextile as directed by the engineer.

c.Remove trapped sediment when the sediment reaches 50 percent of the exposed height of

the geotextile.

5.Silt Fence Removal

a.Remove the silt fence, and all materials incidental to silt fence construction, when the

engineer determines that the fence is no longer required.

b.Restore areas affected by the silt fence construction to the original or plan contours.

c.Stabilize areas affected by the silt fence construction in accordance with Section 908.

C.Sediment Trap

1.Construct sediment traps by excavating to the dimensions and elevations indicated on the

contract and the Standard Construction Details.

2.Stabilize the side slopes with temporary seed in accordance with Section 908.

SEDIMENT TRAPPING DEVICES SECTION 905 582 3. Notify the engineer of conflicts between sediment traps and permanent features to obtain an alternate design for sediment trap locations.

4.Do not excavate sediment traps deeper than 4 -feet. Excavate sediment traps having proposed

bottom elevations greater than 4 -feet below the original grade in stages concurrent with the roadway excavation.

5.Mark the cleanout elevation as 1/2 the design depth of the trap.

6.All traps require an outfall.

7.Sediment trap maintenance:

a.Maintain the sediment trap to the original dimensions and function.

b.Remove accumulated sediment when the sediment reaches the cleanout elevation.

c.Dispose of sediment.

d.Restore the trap to its plan dimensions and elevations.

8.Sediment trap removal:

a.Remove the sediment trap when the contributing drainage area is stabilized at a density of 70

percent as determined by the engineer.

b.Stabilize affected areas in accordance with Section 908 .

D.Inlet sediment control:

1.Provide and place inlet sediment controls, selected from the approved products list

(https://deldot.gov/Business/drc/index.shtml?dc=stormwater). Construct inlet sediment control according to the type required and follow the applicable Standard Construction Details or the manufacturer's recommendations, whichever is more stringent.

2.Inlet sediment control maintenance:

a.Remove accumulated sediment upon discovery.

b.Remove and replace sediment control materials based on the material manufacturer's

requirements or when sediments interfere with the flow of water through the material.

c.Do not allow sediment discharges into bodies of water, ditches, swales, or wetlands that are

state, federal, or privately owned.

3.Inlet sediment control removal:

a.Remove the inlet sediment control when the engineer determines that it is no longer

required.

b.Stabilize affected areas in accordance with Section 908 .

905.4Method of Measurement.

A.The Department will measure:

1.The quantity of silt fence, reinforced silt fence, and super silt fence as the linear feet of fence

placed and accepted. The Department will not include overlap in the measurement. SEDIMENT TRAPPING DEVICES SECTION 905 583 2. Sediment traps as the number of cubic yards of material excavated to construct the sediment traps. The Department will compute the volume of excavated material using the actual dimensions and elevations of the sediment traps constructed as shown in the contract.

3.The quantity of inlet sediment control as each placed and accepted.

B.The Department will not measure sediment trapping device maintenance.

905.5Basis of Payment.

A.The Department will pay the quantity of silt fence, reinforced silt fence, and super silt fence at the

contract unit price per linear foot. Price and payment constitute full compensation for:

1.Providing all materials;

2.excavating, backfill, and backfilling;

3.installing;

4.temporary stabilization;

5.removal;

6.site restoration; and

7.permanent stabilization.

B.The Department will pay the quantity of sediment traps at the contract unit price per cubic yard.

Price and payment constitute full compensation for:

1.Providing all materials;

2.excavating, backfill, and backfilling;

3.establishing outfalls;

4.installing;

5.temporary stabilization;

6.removal;

7.site restoration; and

8.permanent stabilization.

C.The Department will pay the quantity of inlet sediment control at the contract unit price for each.

Price and payment constitute full compensation for:

1.Providing all materials;

2.excavating, backfill, and backfilling;

3.installing;

4.establishing outfalls;

5.temporary stabilization;

6.removal;

7.site restoration; and permanent stabilization.

SEDIMENT TRAPPING DEVICES SECTION 905 584 D. The Department will consider maintenance of the devices, including sediment removal, as incidental to the initial installation of the device. ITEM DESCRIPTION UNIT 905001 SILT FENCE LF 905002 REINFORCED SILT FENCE LF 90500 3 SEDIMENT TRAP CY 90500 4 INLET SEDIMENT CONTROL, DRAINAGE INLET EACH 90500 5 INLET SEDIMENT CONTROL, CURB INLET EACH 90500 6 INLET SEDIMENT CONTROL, CULVERT INLET EACH 90500 7 SUPER SILT FENCE LF

DEWATERING PRACTICES SECTION 906 585 SECTION 906 — DEWATERING PRACTICES

906.1Description.

This work consists of dewatering work sites.

906.2Materials.

A.Portable Sediment Tank. Provide materials for portable sediment tanks as follows:

1.Wire Mesh - 23-gauge wire steel or galvanized welded wire reinforcement with openings 1/4 -

inch by 1/4 -inch.

2.Corrugated Metal Pipe

3.Geotextile Section 1060

4.Fasteners ASTM F541, Type 1 or Type 2

5.Metal Plate - 1/2-inch thick

B.Approved equal sediment tank

C.Dewatering Bag.

Use in accordance with the manufacture’s recommendations with a performance requirement retaining soil particles on a #80 sieve, 177 microns.

D.Sump Pit.

1.Coarse Aggregate , No. 57 Stone Section 1004

2.Corrugated Metal Pipe

3.Geotextile Section 1060

4.Wire Mesh – 23-gauge steel or galvanized welded wire reinforcement with openings 1/4 -inch by

1/4-inch.

5.Approved equal sump pit

E.Skimmer dewatering device

1.Coarse Aggregate , No. 57 Stone Section 1004

2.Pipe Culverts , PVC Section 1031

3.Reinforcing Steel Section 1037

F.Well Point System

1.Coarse Aggregate Section 1004

2.Pipe Culverts Section 1031

3.Reinforcing Steel Section 1037

906.3Construction

Source: Delaware Standard Specifications for Road and Bridge Construction, 2025 Edition. Pages 583–595 of 779.

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