SECTION 208 - STORMWATER MANAGEMENT PRACTICES (Last Revised May 2022)
208-1 DESCRIPTION. The work shall include furnishing, installing, maintaining, and cleaning
stormwater management practices, in accordance with the contract documents and as directed by the Engineer.
208-1.01 General.
A.Definitions.
1.Stormwater Management Practices (SMP). SMPs include structural, soil and vegetative practices that are acceptable for water quality treatment and water quantity control and meet stormwater management performance criteria described in the New York State Stormwater Management Design Manual (issued by the New York State Department of Environmental Conservation).
2.Stormwater Treatment Device (SWTD). A SWTD is a commercially available Stormwater Management product that uses hydrodynamic action, velocity reduction, sediment settling and/or filtering to separate suspended solids from stormwater. SWTDs are installed as part of a stormwater treatment system consisting of one or more SWTDs and all required pipes, such as connection, inlet, bypass and outlet. SWTDs are used alone or in a series with other SMPs.
3.Water Quality Treatment. SMPs are implemented to improve water quality by capturing and treating runoff to remove pollutants from small, frequent storm events that tend to contain higher pollutant levels.
4.Water Quantity Control. SMPs are designed to attenuate or reduce peak flows from storm events to the pre-developed levels to prevent channel erosion, maintain pre-developed hydrology and hydraulics, and often also provide groundwater recharge.
5.Maintenance. Maintenance shall include inspection, repair, and upkeep of stormwater management practices.
6.Cleaning. Cleaning shall include inspection, removal and disposal of trash, debris,
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Sections 200 - 599 STANDARD SPECIFICATIONS (USC) January 1, 2026 Volume 2 hydrocarbons, nutrients and/or metals collected by the practice.
208-1.02 SWTD. The work shall include furnishing, installing, and maintaining a SWTD, in accordance
with the contract documents and as directed by the Engineer.
208-1.03 Cleaning SWTD. The work shall include cleaning SWTDs in accordance with the contract
documents and as directed by the Engineer.
208-2 Materials.
208-2.01 General. None specified
208-2.02 SWTD. The materials shall meet the requirements of the following subsections of Section 700,
Materials and Manufacturing. Stormwater Treatment Device 738-01 The Contractor shall provide a SWTD that is:
A.Sized for the maximum water quality flow shown in the contract documents
B.Appears on the Approved List for the corresponding payment item Pipe (inlet, outlet, bypass and connection) sizes and locations for single unit or multiple units shall be as indicated in the contract documents and paid for under separate payment items. Backfill shall be in conformance with §733-11, Select Granular Fill and shall be paid for separately.
208-2.03 Cleaning SWTD. None specified.
208-3 Construction Details.
208-3.01 General. The Contractor shall inspect and maintain the stormwater management practices for
the duration of the contract. The schedule for inspecting and maintaining each stormwater management practice shall be per the manufacturer’s recommendations to sustain practice performance and efficiency, and/or as indicated in the contract documents. Inspection and maintenance shall be included in the cost of the payment item. The Contractor shall keep a record of stormwater management practice inspections and maintenance. Stormwater management practices not performing to manufacturer’s defined efficiency standards shall be repaired or replaced at no additional cost to the State.
208-3.02 SWTD. The Contractor shall install and maintain the SWTD in accordance with manufacturer
recommendations and the contract documents.
A.Excavation. Excavation shall be in conformance with §206-3.01 and §206-3.02, Trench, Culvert, and Structure Excavation and will be paid for separately. No structure shall be backfilled until all mortar has completely set.
B.Backfill. Backfill shall be installed per §203-3.06, Select Granular Fill and will be paid for separately.
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C.Submittals. A minimum of two weeks prior to installation, the Contractor shall provide a copy of the manufacturer’s cut sheets, installation details, and operations and maintenance manuals for each SWTD unit type. Electronic copies are acceptable.
D.Basis of Acceptance. Acceptance criteria for SWTD:
1.The SWTD manufacturer’s name appears on the Department’s Approved List.
2.The SWTD has been installed per manufacturer’s instructions and at the locations indicated in the contract documents.
3.The SWTD has received maintenance – as needed – during the life of the contract and per manufacturer’s recommendations.
4.The SWTD’s mechanical features are functioning – as described in the manufacturer’s operations and maintenance manual – at the completion of the contract.
5.Acceptance criteria for cleaning: The SWTD has been cleaned per §208-3.03 by the Contractor during the life of the contract as needed, and immediately prior to final contract acceptance.
208-3.03 Cleaning SWTD. Cleaning shall be performed during dry weather. Entry into the SWTD or
nearby drainage structure may be necessary to complete the work described under this specification. SWTDs and other subsurface stormwater drainage devices are confined spaces. Entry into confined spaces requires compliance with OSHA safety procedures (29 CFR 1910.146 and 29 CFR 1926.21) and NYS Industrial Code Rules 12 and 23. The Contractor shall ensure that employees wear all required personal protective equipment (PPE) when performing this work.
A.Advanced Preparation. At least 15 days prior to commencing SWTD cleaning work, prepare and submit the following information to the Engineer for review and approval:
1.Identification of and information on the proposed treatment/disposal facilities to include:
a.name
b.address
c.contact person
2.For transportation off-site, the identification of and information on the proposed waste transporter to include:
a.name
b.address
c.telephone number
d.contact person
e.NYSDEC Part 364 Waste Transporter Permit number
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B.Inspection. In the presence of the Engineer, the Contractor shall open the SWTD access and make a visual inspection. The Contractor shall determine if the device’s inlet and/or outlet is submerged. If the inlet/outlet is submerged, the pipe(s) connecting to the SWTD shall be plugged using a standard rubber expandable plug, or other type of approved fabricated plug. The depth of accumulated sediment in each device shall be measured with a probe and recorded.
C.Cleaning. All solids (trash, debris, floatables, sludge, sediment, and other) and floating petroleum product (oil) shall be removed from all chambers (sediment chamber and outflow chamber) and pipes. The SWTD shall be cleaned using the following steps:
1.Remove any floating petroleum product (oil) with sorbent pads/cloths
2.Remove all trash, debris and floatables
3.Remove all remaining solids (sludge, sediment, and other) and liquids via a vacuum truck
4.Dispose of the liquid and all solids separately as described below
5.Remove plugs and reset manholes
D.Disposal. The Contractor shall dispose of all resulting waste including oil (sorbent pads/cloths), solids (e.g. trash, debris, floatables, sludge, sediment, and other) and liquids. The solid waste product of the cleaning operation (including sorbent material) is considered a nonhazardous solid waste under NYSDEC Part 360 regulations. Liquid waste taken off-site will be considered petroleum- contaminated liquid under NYSDEC Part 360 regulations and shall be transported, treated and/or disposed of at a permitted waste treatment and/or disposal facility. Any single shipment of liquid waste weighing more than 500 pounds must be transported by a permitted hauler who meets NYSDEC’s 6 NYCRR Part 364 industrial waste transport requirements.
E.Basis of Acceptance. The Contractor must submit receipts documenting proper handling of the waste materials (including contaminated liquid) during transport and disposal, in accordance with all Federal, State and local regulations.
208-4 Method of Measurement.
208-4.01 General. Vacant.
208-4.02 SWTD. The work will be measured as the number of each SWTD installed and maintained.
208-4.03 Cleaning SWTD. The work will be measured as the number of each SWTD cleaned.
208-5 Basis of Payment.
208-5.01 General. Vacant.
208-5.02 SWTD. The unit price bid for each SWTD shall include the cost of all labor, materials and
equipment necessary to satisfactorily complete the work, including manhole frames and covers, and SWTD cleaning and maintenance.
A.Excavation. Excavation will be paid for separately under §206 Trench and Culvert Excavation.
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B.Backfill. Backfill of drainage structures and leaching basins will be paid for under the item(s) shown in the contract documents.
C.Pipes. Pipes (outlet, inlet, connection, bypass and others) necessary to complete the stormwater treatment system will be paid for separately. Progress payments will be made upon the satisfactory installation of the SWTD at 75% of the unit price bid. The remaining percentage will be paid after the SWTD has been cleaned and the Engineer has verified that the SWTD is properly functioning at the completion of the contract.
208-5.03 Cleaning SWTD. The unit bid price per each SWTD cleaned shall include the cost of
furnishing all labor, materials, equipment, transport and disposal necessary to satisfactorily complete the work. Progress payments will be made upon the satisfactory cleaning of the SWTD at 75% of the unit price bid. The remaining percentage will be paid after the Engineer has verified and checked quantities on receipts for all wastes received by the disposal facilities. Payment will be made under: Item No. Item Pay Unit 208.5101 SWTD - Maximum Treatment Flow Rate up to 1.0 cfs Each 208.5201 SWTD - Maximum Treatment Flow Rate over 1.0 cfs up to 2.0 cfs Each 208.5301 SWTD - Maximum Treatment Flow Rate over 2.0 cfs up to 2.8 cfs Each 208.5401 SWTD - Maximum Treatment Flow Rate over 2.8 cfs up to 3.8 cfs Each 208.5501 SWTD - Maximum Treatment Flow Rate over 3.8 cfs up to 5.0 cfs Each 208.5601 SWTD - Maximum Treatment Flow Rate over 5.0 cfs up to 7.0 cfs Each 208.5701 SWTD - Maximum Treatment Flow Rate over 7.0 cfs up to 10.0 cfs Each 208.5801 SWTD - Maximum Treatment Flow Rate over 10.0 cfs up to 15.0 cfs Each 208.5901 SWTD - Maximum Treatment Flow Rate over 15.0 cfs up to 25.0 cfs Each 208.60 Cleaning Stormwater Treatment Device Each
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Source: Standard Specifications (US Customary Units), 2026 (Jan) Edition. Pages 269–273 of 1,489. View official source ↗