236 At the time B borrow is being placed fo r approach embankment, a well compacted watertight dam shall be constructed in level lifts, the details of which are shown on the plans. Except as hereinafter specified for material to be used in constructing the enclosing dam, and for growing vegetation, and unless otherwise provided, the material for constructing bridge approach embankment shall be B borrow compacted by mechanical methods. 170 If approach embankment or shoulders are constructed of material not suitable for growing seed or sod, and if one or both of these is required, then such areas shall, unless otherwise specified, be covered with a layer of clay, loam, or other approved material. This layer shall be approximately 1 ft thick after being compacted into place.
211.06 B Borrow Around Bents When specified, B borrow shall be placed around all bents fall ing within the limits
of the approach grade as shown on the plans. Before placing, the surface of the ground on which it is to be placed shall be scarified or plowed as directed. The embankment slope shall be 2:1 on the sides and beneath the structure, and shall be 6:1 from the end 180 of the bridge down to the average ground line, or it may be required to complete the approaches back to the existing grade. An enclosing dam and provisions for growing vegetation shall be constructed in accordance with 211.05.
211.07 Blank
211.08 Spandrel Filling Unless otherwise specified, spandrel fills for arch structures shall be composed of
B borrow. The fill shall be carried up symmetrically in lifts from haunch to crown and simultaneously over all piers, abutments, and arch rings. Compaction shall be in 190 accordance with 211.04. 211.09 Method of Measurement B borrow, structure backfill Type 1, Type 2, or Type 3, and aggregate for end bent backfill will be measured by the cubic yard as computed from the neat line limits shown on the plans. If cubic yards are set out as the pay item for B borrow or structure backfill in the Schedule of Pay Items and if neat line limits are not specified for measurement of volume for the material, m easurement will be made by the cubic yard at the loading point in truck beds which have been measured, stenciled, and approved. 200 The B borrow may be weighed and converted to cubic yards by assuming the weight per cubic foot to be 90% of the maximum wet density in accordance with AASHTO T 99. The material may be cross-sectioned in its original position and again after excavation is complete, and the vo lume computed by the average end area method. If B borrow is used for backfill in areas where unsuitable material is present or peat excavation has been performed, unless otherwise directed, the B borrow will be cross-sectioned, and the volume will be co mputed by the average end area method. 211.06 237 210 Structure backfill Type 4 or Type 5 will be measured by the cubic yard as computed from the neat line limits shown on the plans. If neat line limits are not shown on the plans, the volume in cubic yards of flowable backfill furnished and placed as structure backfill Type 4 or Type 5 will be computed from the nominal volume of each batch and a count of the batches. Unused and wasted flowable backfill will be estimated and deducted. If the material is to be paid for by the ton, it shall be weighed in accordance with 109.01(b). 220 If the material comes from a wet source such as below water or a washing plant, and weighing is involved in the method of measurement, there shall be a 12 h drainage period prior to the weighing. Geotextile will be measured in accordance with 616.12.
211.10 Basis of Payment The accepted quantities of B borrow will be paid for at the contract unit price per cubic yard or per ton as specified, complete in place.
Structure backfill will be paid for at the contract unit price per cubic yard of the type specified, provided the material come s from outside the permanent right-of-way. B borrow material placed outside the neat lines will be paid for as borrow when such B borrow eliminates required borrow material. Otherwise, no payment will be made for backfill material pl aced outside th e neat lines. Aggregate for end bent backfill will be paid for at the contract unit price per cubic yard, based on the neat line limits shown on the plans. 240 Geotextile will be paid for in accordance with 616.13. If topsoil, loam, or other suitable material in accordance with 211.05 is used for expediting the growth of seed or sod, it will be paid for at the contract unit price per cubic yard for borrow, unless otherwise provided. Payment will be made under the following: Pay Item Pay Unit Symbol 250 Aggregate for End Bent Backfill ............................................... CYS B Borrow ................................................................................... CYS TON Structure Backfill, Type _____ ................................................. CYS 211.10 238 No payment will be made under this section for material obtained within the excavation limits of the project if the Contractor is directed to use the material as B borrow or structure backfill in a pipe trench, culvert, construction of an embankment or fill, or if the Contractor uses the materi al for its own convenience. Material obtained from within the excavation limits of the project and which the Contractor is directed 260 to use as B borrow or structure backfill for other purposes including replacement of undercut areas, support for a retaining wall sy stem, and end bent fill will be paid for at the contract unit price of $5.00 per cubic yard for B borrow/structure backfill handling. The cost of disposal of excavated material shall be included in the cost of the pay items in this section.