The Contractor shall supply the MSE retaining wall components described above, including wire-facing, concrete face panels, retaining strips or mesh, tie strips, fasteners, earth-retention materials, draina ge system components, and all necessary incidentals, through a manufacturer listed on the QPL of Retaining Wall Systems. 100 CONSTRUCTION REQUIREMENTS
735.06 General Requirements Foundation preparation shall be in acco rdance with 731.07. Retaining-wall
excavation shall be in accordance with 731.08.
735.07 Wall Erection
The wall system components shall be constructed in accordance with the wall system supplier’s recommendations and construction manual. 110 The Contractor shall perform the necessary work to verify that the foundation is at the correct elevation, that the wall is constructed to the correct alignment, and that the work is in accordance wi th the specified tolerances. Ground reinforcement shall be placed no rmal to the face of the wall, unless otherwise shown on the plans or as directed. Prior to placement of the ground reinforcement, backfill shall be placed and compacted in accordance with 731.11. Where shown on the plans, backing mats shall be placed behind the wire-facing. 120 Where shown on the plans, galvanized screens with openings not exceeding 1/2 in. shall be placed behind the wi re-facing to retain the earth.
735.08 Method of Measurement
The measurement of temporary wire-facing and temporary wall erection will be based on the square foot of area contained within the neat line limits of the wall envelope shown on the plans and not that of the wall system supplier. Common excavation will be measured in accordance with 203.27. Structure backfill and B borrow will be measur ed in accordance with 211.09. 130 Unsuitable foundation materials, if found, will be measured in accordance with
211.09 If unsuitable foundation material is encountered in the portion of the foundation beneath the reinforced backfill zone in a section constructed on original
ground or in a cut section, the removal, replacement, and compaction of the new material will be measured in accordance with 203.27 and 211.09. 735.08 862 Geotextile materials will not be measured. Drainage of the backfill including piping, aggregates, and incidentals will not be measured.
735.09 Basis of Payment
The accepted quantities of temporary wire-facing and temporary wall erection will be paid for at the contract unit price per square foot. Common excavation will be paid for in accordance with 203.28. Structure backfill and B borrow will be paid for in accordance with 211.10. Unsuitable foundation materials will be paid for in accordance with 211.10. Payment will be made under: 150 Pay Item Pay Unit Symbol Temporary Wall Erection .......................................................... SFT Temporary Wire-Facing ............................................................ SFT The cost of all MSE retaining wall components including wire-facing elements, concrete face panels, ground reinforcing, tie strips, fasteners, soil retention materials, repair or replacement of wire-facing elemen ts damaged or removed due to backfill placement, and incidentals shall be include d in the cost of temporary wire-facing. If unsuitable foundation material is encountered in the portion of the foundation beneath the reinforced backfill zone in a section constructed on original ground or in a cut section, the cost of removal, replacement, and compaction of new material will be paid for in accordance with 203.28 and 211.10. If unsuitable foundation material is encountered in the portion of the foundation beneath the reinforced backfill zone that is constructed on an embankment section that is constructed under the same contract, the cost of removal, replacement, and compaction of new material will not be considered for payment. The cost of geotextiles shall be included in the cost of the pay items in this section. The cost of all labor and materials required to prepare the wall foundation, to place the ground reinforcement, and to erect the c oncrete face panels shall be included in the cost of temporary wall erection. The cost of labor and materials required to provide for the drainage of the backfill including piping, aggregates, or geotextile materials shall be included in the cost of temporary wire-facing. The cost of performing the laboratory tests by a qualified geotechnical consultant for structure backfill or ACBF slag shall be included in the cost of the pay items in this section. 735.09 The cost of all labor and materials for geotextile materials used shall be included in the cost of the pay items in this section. The cost of cutting, altering, and recoating of the ground reinforcement at the site shall be included in the cost of temporary wall erection. 190