ses, furnishing and placing fertilizer and ground limestone if required, all in reasonably close conformity with these specifications at the locations shown on the plans or as designated by the Engineer. Materials 629.02 Materials shall meet the requirements of the following sub 629.03 Season. Sodding operations shall be done during the normal season for sodding or at such time as indicated on the plans, in the special provisions, or authorized in writing by the Engineer. 629.04 Sources of Sod. The Contractor shall notify the Engineer not less than 3 days before cutting of sod begins. Sod will be approved by the Engineer in its original position before cutting and delivery to the project. 629.05 Soil Preparation and Cleanup. Before the delivery of sod, areas to be sodded shall be brought to the lines and grades as required and then plowed, disced or harrowed or otherwise loosened to the depth shown on the plans. Cleanup shall include removal of stones larger than 2 inches (50.8 mm) in any diameter, sticks, stumps and other debris which might interfere with the proper laying or subsequent growth of sod. On slopes steeper than 3:1 the depth of tillage may be reduced as directed; however, the earth surface shall be loosened prior to applying fertilizer, ground limestone or other material. 629.06 Topsoiling. Topsoil, when required, shall be placed, measured and paid for in accordance with Section 624. 629.07 Applying Fertilizer and Ground Limestone. Following soil preparation, cleanup, and topsoiling if required, fertilizer and ground limestone when specified, shall be uniformly spread at the rate indicated on the plans. Approved mechanical spreaders, blower equipment or other approved methods may be used for spreading fertilizer and ground limestone after which such materials shall be incorporated into the soil by discing or other tillage to the depth shown on the plans. 629.08 Laying Sod. Sod shall be laid on the prepared sod bed within 24 hours after cutting, except that sod may be stored in stacks or piles, grass to grass and roots to roots for not more than 5 days. Sod shall be protected against drying from sun or wind and from freezing as necessary. The moving and laying of sod shall, as far as possible, be done when weather conditions and soil moisture are favorable. Sod shall be laid under one or more of the following methods as shown in the bid schedule: (a) Solid sodding shall be laid when soils are moist. Dry sod bed areas shall be well moistened before sod is laid. Sections of solid sod shall be laid edge to edge with staggered joints. Openings shall be plugged with sod or filled with acceptable loamy topsoil. After laying and joint filling, sod shall be rolled or tamped with approved equipment to eliminate air pockets and provide an even surface. On slopes of 2:1 or steeper and in channels, sod shall be pegged after tamping, pegs being driven flush with the sod bed surface. (b) Strip sod shall be laid in parallel rows, as indicated on the plans. Each strip of sod shall be of the width shown on the plans and shall be laid in a shallow trench and firmly rolled or tamped until the surface of the sod is level with or below the adjacent soils. If required by the special provisions, the ground between strips of sod shall be seeded with grass seeds of the kind, and at rates shown. Seeded areas shall then be raked or dragged to cover the seed. (c) Spot sodding shall consist of sod blocks laid in accordance with the details shown on the plans. The pieces of sod shall be firmly rolled or tamped into the soil until the surfaces of sod blocks are slightly below the surrounding ground surface. 629.09 Care During Construction, Watering and Temporary Maintenance of Sodded Areas. Sod shall be watered when laid and kept moist until final acceptance of the contract. Watering shall be done by use of tank trucks equipped with means for even distribution of water at a measured rate, per unit of area, or from approved metered sources. Watering shall be done so as to avoid erosion and prevent damage to sodded areas by wheels of vehicles. The Contractor shall erect necessary warning signs and barriers, mow sodded areas, and repair or replace sodded areas failing to show a uniform growth of grass, or damaged by his operations, and shall otherwise maintain the sod until final acceptance of the contract. Replacement of dried out or damaged sod shall be at the Contractor's expense. Method of Measurement 629.10 The quantity of sodding to be paid for will be the number of square yards of (a) solid sodding, (b) strip sodding, or (c) spot sodding measured on the ground surface, completed in accordance with these specifications except areas seeded in conjunction with (b) strip sodding will be measured as provided under Section 625. Water, if called for as a separate item, will be measured in thousands of gallons delivered and applied as directed. Basis of Payment 629.11 The quantity determined as provided above will be paid for at the contract price per unit of measurement for the pay items listed below, which price and payment will be full compensation for the work prescribed in this section, except as provided in (1), (2) and (3) below: (1) Topsoil will be paid for as provided under Section 624. (2) Seeding will be paid for as provided under Section 625. Payment will be made under: Pay item 629(1) Solid sodding 629(2) Strip sodding 629(3) Spot sodding.. 629(4) Water__. Section 630.-GABIONS Description 630.01 This item shall consist of furnishing and placing rock and wire mesh baskets (gabions), installed at the locations designated, in accordance with these specifications and in conformity with the lines, grades, dimensions, and arrangements shown on the plans or ordered by the Engineer. Materials 630.02 Gabions. Gabions shall be supplied in various lengths and heights. The lengths shall be multiples (2, 3, or 4) of the horizontal width. The heights shall be equal to, 1⁄2 of, or 1⁄2 of the horizontal width. The horizontal width shall be not less than 36" (914 mm). Gabions furnished shall be of uniform width. Gabion dimensions are subject to a tolerance limit of 3% of manufacturer's stated sizes. Gabions shall be constructed of wire mesh. The wire mesh shall be made of galvanized steel wire having a minimum size of 0.120 inch (3.05 mm) diameter (U.S. Wire Gage No. 11). The tensile strength of the wire shall be in the range of 60,000 to 85,000 psi (413.7 to 586.1 MPa). The minimum zinc coating of the wire shall be 0.80 oz./sq. ft. (22.7 g per 0.0929 m2) of uncoated wire surface as determined by tests conducted in accordance with ASTM A 90. Construction Requirements 630.03 The wire mesh shall be twisted to form hexagonal openings of uniform size. The maximum linear dimension of the mesh opening shall not exceed 41⁄2 inches (115 mm) and the area of the mesh opening shall not exceed 8 square inches (51.6 cm2). The mesh shall be fabricated in such a manner as to be non-raveling. Non-raveling is defined as the ability to resist pulling apart at any of the twists or connections forming the mesh when a single wire strand in a section is cut. Gabions shall be fabricated in such a manner that the sides, ends, lid, and diaphragms can be assembled at the construction site into rectangular baskets of the specified sizes. Gabions shall be of single unit construction-base, lid, ends, and sides shall be either woven into a single unit or one edge of these members connected to the base section of the gabion in such a manner that strength and flexibility at the point of connection is at least equal to that of the mesh. Where the length of the gabion exceeds its horizontal width the gabion shall be equally divided by diaphragms, of the same mesh and gauge as the body of the gabions, into cells the length of which does not exceed the horizontal width. The gabion shall be furnished with the necessary diaphragms secured in proper position on the base in such a manner that no additional tying at this junction will be necessary. All perimeter edges of the mesh forming the gabion shall be securely selvedged so that the joints formed by tying the selvedges have at least the same strength as the body of the mesh. Selvedge wire used through all the edges (perimeter wire) shall not be less than 0.148 inch diameter (3.76 mm) (U.S. Wire Gage No. 9) and shall meet the same specifications as the wire mesh. Tie and connection wire shall be supplied in sufficient quantity to securely fasten all edges of the gabion and diaphragms and to provide for four cross connecting wires in each cell whose height is 1⁄2 or 1⁄2 the width the gabion, and 8 connecting wires in each cell whose height equals the width of the gabion. The wire is to meet the same specifications as for wire used in the mesh except that it may be not more than 2 gauges smaller. 630.04 Rock Fill. Rock used in the gabions shall be sound and durable, from any source approved by the Engineer. No rock shall be less than four (4) inches (102 mm) (minimum dimension), nor greater than thirteen (13) inches (330 mm) (maximum dimension); the rock shall be reasonably well graded between the limiting sizes. 630.05 Assembly and Installation. Gabions shall be installed according to the manufacturer's recommendations. The gabions shall be placed on a smooth foundation. Final line and grade shall be approved by the Engineer. Each gabion unit shall be assembled by binding together all vertical edges with wire ties on approximately six inch (152 mm) spacing or by a continuous piece of connecting wire stitched around the vertical edges with a coil about every four inches (102 mm). Empty gabion units shall be set to line and grade as shown on the plans or as directed by the Engineer. Wire ties or connecting wire shall be used to join the units together in the same manner as described above for assembling. Inter nal tie wires shall be uniformly spaced and securely fastened in each cell of the structure. A standard fence stretcher, chain fall, or iron rod may be used to stretch the wire baskets and hold alinement. The gabions shall be filled with stone carefully placed by hand or machine to assure alinement and avoid bulges with a minimum of voids. Alternate placing of rock and connection wires shall be performed until the gabion is filled. After a gabion has been filled, the lid shall be bent over until it meets the sides and edges. The lid shall then be secured to the sides, ends and diaphragms with the wire ties or connecting wire in the manner described above for assembling. Method of Measurement 630.06 The quantity to be paid for will be the number of cubic yards of gabions completed, accepted and measured in accordance with measurement of quantities, Section 109.01. Basis of Payment 630.07 The quantities, determined as provided above, will be paid for at the contract price per unit of measurement for the pay item listed below, which price and payment shall constitute full compensation for furnishing and placing wire baskets and rock, and for all labor, equipment accessories, and tools necessary to complete the work described in this section. Payment will be made under: Pay item 630(1) Gabions_. Pay unit Cubic yard. Section 631.-CRIB WALLS Description 631.01 This work shall consist of the construction of metal or concrete crib type retaining walls in accordance with these specifications, and in reasonably close conformity with the lines and grades shown on the plans or established by the Engineer. |