620Bank and Channel Protection

620-1 DESCRIPTION. This work shall consist of furnishing all labor, equipment, and materials to place

a protective covering of erosion-resistant material in the locations indicated in the contract documents or as directed by the Engineer. The work shall be done in accordance with these specifications and in conformity with the lines, grades, thicknesses, and typical sections shown in the contract documents or established by the Engineer.

620-1.01 Vacant.

620-1.02 Stone Filling. Stone filling shall consist of a layer of well graded stone.

620-1.03 Dry Rip-Rap. Dry rip-rap shall consist of a fitted layer of shaped and graded stone.

620-1.04 Grouted Rip-Rap. Grouted rip-rap shall consist of a layer of stone, similar to dry rip-rap, with

the spaces between the stones filled with cement grout.

620-1.05 Bedding Material. Bedding material shall consist of a layer of granular material placed to

prevent underlying finer material from passing into and through the stone filling or rip-rap.

620-1.06 Concrete Block Slope Paving. Concrete block slope paving shall consist of concrete blocks

placed on embankment slopes under structures as protection against erosion.

620-1.07 Gabions. Gabions shall consist of open wire mesh baskets, filled with stones.

620-2 Materials

620-2.01 General. The requirements for bank and channel protection materials are described below. The

procedure for acceptance or rejection of stone filling and rip-rap materials shall be in conformance with the procedures contained in the geotechnical control procedure “Procedure for the Control of Stone Filling and Rip-Rap Items”.

620-2.02 Stone Filling. Provide material meeting the requirements of §733-21 Stone Filling for the type

of stone filling specified in the contract documents.

620-2.03 Dry Rip-Rap. Provide material meeting the requirements of §733-22 Rip-Rap, except for §733-

22D Grout.

620-2.04 Grouted Rip-Rap. Provide material meeting the requirements of §733-22 Rip-Rap.

620-2.05 Bedding Material. Bedding material shall meet the requirements of the following subsections

of Section 700 Materials and Manufacturing for the type of bedding material specified in the contract documents:

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620-2.06 Concrete Block Slope Paving. Provide concrete blocks meeting the requirements of §704-04

Concrete Block Slope Paving. The blocks shall conform to the dimensions identified in Table 620-1 Concrete Block Dimensions: TABLE 620-1 CONCRETE BLOCK DIMENSIONS Nominal Dimension Standard Dimension Length 16 to 20 in. 15 ⅝ to 19 ⅝ in. (± ⅛ in.) Thickness 6 in. (solid) 5 ⅝ in. (± ⅛ in.) Width 8 in. 7 ⅝ in. (± ⅛ in.) The size of block used shall be consistent throughout any continuously paved area, and only one nominal length shall be used in any contract. All units shall be sound and free from cracks or other defects that would interfere with the proper placing of the blocks or impair the strength, permanence and appearance of the construction. Cushion sand for concrete block slope paving shall meet the requirements of §703-06 Cushion Sand. Grout, where used, shall conform to Table 620-2 Concrete Block Slope Paving Grout Requirements. TABLE 620-2 CONCRETE BLOCK GROUT REQUIREMENTS Material Subsection Grout Mix Portland Cement Type 2 §701-01 1 part Mortar Sand §703-03 2 parts

620-2.07 Gabions. Provide materials meeting the requirements of §712-15 Gabions.

620-3 Construction Details

620-3.01 General. The ground surface on which bank or channel protection is to be placed shall be free

of brush, trees, stumps, and other objectionable material and shall be dressed to a smooth surface. All soft or spongy material shall be removed to the depth shown in the contract documents and replaced with approved material. Filled areas shall be compacted in accordance with applicable provisions of Section 203. Protection for structure foundations shall be provided as early as the foundation construction permits. The type of protection shall be placed in accordance with these specifications and the contract documents.

620-3.02 Stone Filling. Stone filling shall be placed in a manner that will produce a reasonable well-

graded mass of stone with smaller stone fragments filling the space between the larger ones, so as to result in the minimum practicable percentage of voids. The final section of stone filling shall be in conformance with the lines, grades, and thicknesses shown in the contract documents. Stone filling used for bank or channel protection shall be placed to its full course thickness in one operation, unless specified in the special provisions, and in such a manner that the underlying material will not be displaced or worked into the layer of stone filling. Placement of stone upon finished bedding material, when used, shall be carefully controlled to avoid disruption and damage to the layer of bedding material. The stone shall be so placed and distributed that there will be no pockets of uniform size material. The desired distribution of the various sizes of stone throughout the mass shall be obtained by selective loading of the material at the quarry or other source; by controlled dumping of successive loads during final placing; or by other methods of placement which will produce the specified results. Rearranging of individual stones by mechanical equipment or by hand will be required to the extent necessary to secure the specified results. When stone filling is dumped under water, methods shall be used that will minimize segregation.

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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3

620-3.03 Dry Rip-Rap. The stones shall be placed so that the dimension approximately equal to the layer

thickness is perpendicular to the slope surface and that the weight of the stone is carried by the underlying material and not by the adjacent stones. On slopes, the largest stones shall be placed at the bottom of the slope. The dry rip-rap shall be properly aligned and placed so as to minimize void spaces between the adjacent stones. The spaces between the stones shall be filled with spalls of suitable size.

620-3.04 Grouted Rip-Rap. The procedure of placing the stones shall be the same as described in §620-

3.03 Dry Rip-Rap except that the space between stones shall be filled with grout rather than spalls. Material upon which the grouted rip-rap is laid shall not be allowed to occupy the space between the stones. When the stones are in place, the spaces between them shall be completely filled with grout and the surface of the stones cleaned to remove accumulation of grout. Rip-rap shall not be grouted in freezing weather. The grouted rip-rap shall be kept moist for seven days after grouting. A suitable curing compound may be employed, if approved by the Engineer. The Engineer may direct that occasional spaces be left ungrouted for relief of hydrostatic pressure. The ungrouted spaces shall be chinked with spalls of suitable size.

620-3.05 Bedding Material. Where called for in the contract documents, stone filling and dry rip-rap

shall be placed on bedding material. The bedding material shall be placed on the prepared area to the full specified thickness of each layer in one operation, using methods which will not cause segregation of particle sizes. Contamination of bedding material by natural soils or other materials shall be prevented. Bedding material that becomes contaminated shall be removed and replaced with uncontaminated bedding material at no additional cost to the State.

620-3.06 Concrete Block Slope Paving. Blocks shall be laid on a 3 in. bed of cushion sand in running

bond with the long dimension transverse to the slope and all joints tight. Blocks shall be set slightly higher than their final position and carefully hand tamped into their final position to provide a uniformly even surface and solid bedding under each block. In the areas where grouting is called for, the block shall be laid in running bond with the length parallel to the slope and with ¼ in. joints. Following the laying of blocks, in the area to be grouted, sufficient mortar sand shall be spread over the surface and swept into the joints to fill the latter to 4 in. from the surface. The block shall be wetted before any grout is placed. The joints shall be filled with grout from the bottom flush with the top of the block. After grouting has been completed and the grout has sufficiently hardened, the blocks shall be wetted, covered and cured with curing covers for the first seven days after grouting. Grout shall not be poured during freezing weather.

620-3.07 Gabions. Each gabion unit shall be assembled by binding together all vertical edges with wire

ties on approximately 6 in. spacing or by a continuous piece of connecting wire stitched around the vertical edges with a coil about every 4 in. Empty gabion units shall be set to line and grade as shown in the contract documents. For structural integrity, wire ties or connecting wire shall be used to join the gabions together along the perimeter of all contact surfaces according to the manufacturer's instructions. Internal tie wires shall be uniformly spaced and securely fastened in each outside cell of the structure in accordance with the manufacturer's instructions or where ordered by the Engineer. When gabions are being placed as slope protection, the cross-connecting wire may be deleted if directed by the Engineer. A fence stretcher, chain fall, or iron rod may be used to stretch the wire baskets and hold alignment. The gabions shall be filled with stone, carefully placed by hand or machine, to ensure alignment and avoid bulges with a minimum of voids. After a gabion has been filled, the lid shall be bent over until it meets the side and edges. The lid shall then be secured to the sides, ends, and diaphragms with wire ties or connective wire in the same manner described above for assembly.

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620-4 Method of Measurement

620-4.01 General. Vacant.

620-4.02 Stone Filling. Stone filling will be measured in cubic yards, measured to the nearest whole

cubic yard, computed from the payment lines shown in the contract documents.

620-4.03 Dry Rip-Rap. Dry rip-rap will be measured in cubic yards, measured to the nearest whole cubic

yard, computed from the payment lines shown in the contract documents.

620-4.04 Grouted Rip-Rap. Grouted rip-rap will be measured in cubic yards, measured to the nearest

whole cubic yard, computed from the payment lines shown in the contract documents.

620-4.05 Bedding Material. Bedding material will be measured in cubic yards, measured to the nearest

whole cubic yard, computed from the payment lines shown in the contract documents.

620-4.06 Concrete Block Slope Paving. Concrete block slope paving will be measured in square yards,

measured to the nearest whole square yard, computed from the payment lines shown in the contract documents.

620-4.07 Gabions. Gabions will be measured in cubic yards, measured to the nearest whole cubic yard,

computed from the payment lines shown in the contract documents.

620-5 Basis of Payment

620-5.01 General. Vacant.

620-5.02 Stone Filling. The unit price bid shall include the costs of furnishing all labor, material and

equipment necessary to complete the work except that any necessary excavation will be paid for separately.

620-5.03 Dry Rip-Rap. The unit price bid shall include the costs of furnishing all labor, material and

equipment necessary to complete the work except that any necessary excavation will be paid for separately.

620-5.04 Grouted Rip-Rap. The unit price bid shall include the costs of furnishing all labor, material and

equipment necessary to complete the work except that any necessary excavation will be paid for separately.

620-5.05 Bedding Material. The unit price bid shall include the costs of furnishing all labor, material and

equipment necessary to complete the work except that any necessary excavation will be paid for separately.

620-5.06 Concrete Block Slope Paving. The unit price bid shall include the costs of furnishing all labor,

material and equipment necessary to complete the work except that any necessary excavation will be paid for separately.

620-5.07 Gabions. The unit price bid shall include the costs of furnishing all labor, material and

equipment necessary to complete the work except that any necessary excavation will be paid for separately.

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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3 Payment will be made under: Item No. Item Pay Unit 620.02 Stone Filling (Fine) Cubic Yard 620.03 Stone Filling (Light) Cubic Yard 620.04 Stone Filling (Medium) Cubic Yard 620.05 Stone Filling (Heavy) Cubic Yard 620.06 Dry Rip-Rap Cubic Yard 620.07 Grouted Rip-Rap Cubic Yard 620.0801 Bedding Material, Type 1 Cubic Yard 620.0802 Bedding Material, Type 2 Cubic Yard 620.09 Concrete Block Slope Paving Square Yard 620.10 Galvanized Gabions Cubic Yard 620.11 P.V.C. Coated Galvanized Gabions Cubic Yard