204-1 01
NEW YORK STATE DEPARTMENT OF TRANSPORTATION Sections 200 - 599 STANDARD SPECIFICATIONS (USC) January 1, 202 4 Volume 2 SECTION 204 - FLOWABLE FILL
204-1 DESCRIPTION. The work shall consist of mixing and placing flowable fill at the locations
shown in the contract documents.
204-1.01 Controlled Low Strength Material. Controlled Low Strength Material (CLSM) is an
acceptable alternative to compacted soil backfill in confined spaces. CLSM consists of cement, water and, at the Contractor’s option, fly ash, aggregate or chemical admixtures in any proportions such that the f inal product meets the strength and flow consistency requirements included in the specification. The mix is proportioned to be self leveling and does not require compaction. It is much lower in strength than concrete, making future excavation possible.
204-1.02 Lightweight Concrete Fill. Lightweight Concrete Fill is an engineered geotechnical material
with a unique strength / density relationship which can be used to reduce loads on soft foundation soils, buried structures, or against retaining walls. Lightweight Concrete Fill consists of a Portland cement matrix containing uniformly distributed, non -interconnected air voids introduced by a foaming agent. The flowability and cementitious properties provide a product that is self leveling and does not require compaction.
204-2 Materials .
204-2.01 Controlled Low Strength Material. Provide backfill material meeting the requirements for
CLSM as stated in §733 -01 Flowable Fill .
204-2.02 Lightweight Concrete Fill. Provide backfill material meeting the requirements for
Lightweight Concrete Fill as stated in §733 -01 Flowable Fill .
204-3 Construction Details .
204-3.01 Controlled Low Strength Material.
A.CLSM Submittal . Submit to the Engineer (1) a mix design, with certified test results supplied by a qualified independent testing laboratory for the CLSM verifying the unconfined compressive strength meets the requirements of the specification, and (2) the methods of installation to be employed. Include in the CLSM placement sequence, a procedure to account for subsidence during the settling and curing process.
B.CLSM Production . Mix the materials at a stationary mixing plant which is either a continuous or a batch type plant. A batch is defined as the amount of material that can be mixed at one time. Design the mix of materials to accurate proportions, either by volume or by weigh t, so that when the materials are incorporated in the mix a thorough and uniform mix will result. If the CLSM can be placed within 30 minutes of the end of mixing, then open haul units may be used for transport. If it cannot be placed within 30 minutes after the end of mixing, it must be transported by a rotating drum unit capable of 2 -6 rpm. For work involving quantities of CLSM less than 2.5 yd3, the Contractor may use a small portable mixer. Provide a mixer capable of mixing CLSM that has the specified unconfined compressive strength and flow consistency. Mix all components so as to produce a uniform product.
C.CLSM Placement - General . Do not place CLSM that is frozen, or place CLSM on frozen ground. Do not expose CLSM to freezing temperatures until after it has gained its requisite strength, abiding by the Provisions for Curing in Cold Weather in Section 555 Structural Concrete .
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Sections 200 - 599 STANDARD SPECIFICATIONS (USC) January 1, 202 4 Volume 2 If the CLSM is to be placed via pumps, the placement sequence shall be such that the equipment is able to access the entire volume to be filled without separating the mixture. Keep CLSM encapsulated with soil or protected by other means so as to prevent erosion and environmental degradation.
D.CLSM Placement – at Structures, Culverts, Pipes, Conduits and Direct Burial Cables . Place the CLSM in accordance with the installation details shown on the Standard Sheet. When placing CLSM for pipe backfill, discharge the material onto the top and at the center of the pipe. Do not place CLSM in contact with aluminum pipe, including connections, fixtures, etc., unless the aluminum has been thoroughly coated with Zinc Chromate Primer, §708 -04 Zinc Chromate Primer, or an equivalent alternative as approved by the Materials Bureau. Do not place CLSM containing fly ash in direct contact with cast iron or ductile iron pipes, fittings or appurtenances. In situations where CLSM is used as backfill around pipe, take precautions to counteract the pipe’s buoyancy.
E.CLSM – QA Testing . The Department maintains a Quality Assurance (QA) program for CLSM. The Department will sample and test specimens of the CLSM during placement to compare its properties to the specification requirements and verifying the spread diameter and unconfined comp ressive strength of the in -place material. The QA program provides oversight of the Contractors Quality Control (QC) process, to reveal changes which may occur in the approved mix design. Several scenarios may develop as a result of the QA testing.
1.The properties are shown to m eet the requirements of the specification for the type(s) identified in the contract documents . No action will be taken.
2.The properties are shown to be outside the requirements of the specification for the type(s) identified in the contract documents .
a.If the results are within an acceptable margin as determined by the Department through an independent analysis of the site specific conditions, the material may remain in -place contingent upon an agreed credit. If a credit cannot be agreed upon, the scenar io reverts to 2.b.
b.If the results are not within an acceptable margin as determined by the Department through an independent analysis of the site specific conditions, the entire lift (and all overlying lifts) of material will be removed and replaced at the Contractor's expense.
204-3.02 Lightweight Concrete Fill.
A.Lightweight Concrete Fill Submittal . Submit to the Engineer (1) a mix design, with certified test results supplied by a qualified independent testing laboratory for the Lightweight Concrete Fill verifying the wet cast density and unconfined compressive strength meets the requirements of the specification for the type(s) identified in the contract documents, and (2) the methods of installation to be employed.
B.Lightweight Concrete Fill Production . Generate foam in accordance with the manufacturer’s recommendations for inclusion into the mix. Mix the materials at a stationary mixing plant which is either a continuous or a batch type plant. A batch is defined as the amount of material that can be mixed at one time. Design the mix of
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Sections 200 - 599 STANDARD SPECIFICATIONS (USC) January 1, 202 4 Volume 2 materials to accurate proportions, either by volume or by weight, so that when the materials are incorporated in the mix, a thorough and uniform mix will result. Locate equipment such that the mixed product is capable of being pumped into place properly.
C.Lightweight Concrete Fill - Placement . A representative of the supplier of the foaming agent shall be on site during the initial placement and at such times as requested by the Engineer to advise the Contractor on his operation. The lightweight concrete fill shall be placed in lifts not to excee d 24 in. unless otherwise approved by the Engineer. Subsequent lifts shall be placed only after a minimum 12 hour waiting period has been observed. At the end of each pour, exposed surfaces shall be roughened with a stiff broom or scored with a tool. The Lightweight Concrete Fill shall be placed on supporting surfaces which have been cleaned of loose debris, sand, dust, or other foreign materials to the satisfaction of the Engineer. Do not place Lightweight Concrete Fill that is frozen, or place Lightweight Concrete Fill on frozen ground. Do not expose Lightweight Concrete Fill to freezing temperatures until after it has gained its requisite strength, abiding by the Provisions for Curing in Cold Weather in Section 555 Structural Concrete .
D.Lightweight Concrete Fill – QA Testing . The Department maintains a Quality Assurance (QA) program for Lightweight Concrete Fill. The Department will sample and test specimens of the Lightweight Concrete Fill material during placement to compare its properties to the specification requirements an d verifying the wet cast density and unconfined compressive strength of the in -place material. The QA program provides oversight of the Contractors Quality Control (QC) process, to reveal changes which may occur in the approved mix design. Several scenarios may develop as a result of the QA testing.
1.The properties are shown to m eet the requirements of the specification for the type(s) identified in the contract documents . No action will be taken.
2.The properties are shown to be outside the requirements of the specification for the type(s) identified in the contract documents .
a.If the results are within an acceptable margin as determined by the Department through an independent analysis of the site specific conditions, the material may remain in -place contingent upon an agreed credit. If a credit cannot be agreed upon, the scena rio reverts to 2.b.
b.If the results are not within an acceptable margin as determined by the Department through an independent analysis of the site specific conditions, the entire lift (and all overlying lifts) of material will be removed and replaced at the Contractor's expense.
204-4 Method of Measurement .
204-4.01 Controlled Low Strength Material. CLSM will be measured for payment in cubic yards
measured to the nearest 0.1 cubic yard computed from the payment lines shown on the contract documents. A deduction will be made for pipes (based on nominal diameters) and other features when the combined cross -sectional area exceeds 1 ft2. No additional quantity shall be measured for payment to make up losses due to foundation settlement, compaction, erosion or any other cause.
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Sections 200 - 599 STANDARD SPECIFICATIONS (USC) January 1, 202 4 Volume 2 Cross sectioning, for the purpose of determining quantities for payment, will be employed only where payment lines are not shown on the contract documents or Standard Sheets, and cannot be reasonably established by the Engineer.
204-4.02 Lightweight Concrete Fill. Lightweight Concrete Fill will be measured for payment in cubic
yards measured to the nearest 0.1 cubic yard computed from the payment lines shown on the contract documents.
204-5 Basis of Payment
204-5.01 Controlled Low Strength Material. The unit price bid shall include the costs of all labor,
material, and equipment necessary to satisfactorily complete the work.
204-5.02 Lightweight Concrete Fill. The unit bid price shall include the cost of all labor, materials, and
equipment necessary to satisfactorily complete the work. Payment will be made under: Item No. Item Pay Unit 204.01 Controlled Low Strength Material (CLSM) Cubic Yard 204.02 Controlled Low Strength Material (CLSM) (No Fly Ash) Cubic Yard 204.03 Lightweight Concrete Fill (Type A) Cubic Yard 204.04 Lightweight Concrete Fill (Type B) Cubic Yard SECTION 205 - CONTAMINATED SOIL (Last Revised January 2019)
205-1 Description .
205-1.01 General. Soil contamination may include:
A.Petroleum products, which may include, but are not limited to: gasoline, heating oils, diesel fuel, kerosene, jet fuel, lubricating oils, motor oils, greases, and other fractions of crude oil;
B.Contaminants associated with past Manufactured Coal Gas Plant (MGP) operations;
C.Other contamination by organic constituents including volatile organic compounds;
D.Metal(s) such as lead, chromium, and/or other heavy metals; and/or
E.Any other constituents that require specialty disposal of the soil. Additional information regarding contaminated soil may be available in a Special Note entitled Soil Characterization Information and/or in a Contaminated Materials Assessment Report, if such Special Note and/or Report were prepared by the Department during project design.
205-1.02 Segregation and Storage. This work shall consist of segregating contaminated soil from non -
contaminated soil during excavation, and the temporary storage and management of contaminated soil (pending sampling, analysis and ultimate disposition) in accordance with an accepted Cont aminated Material Handling Plan.
Source: New York Standard Specifications, 2024 Edition. Pages 46–48 of 1,264.