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z Produce and supply concrete for the leveling pad meeting the requirements of Section 347 . Assume responsibility for performance of all testing required by Section 346 . Use let Department approved mix designs . 548-2 .2 Reinforcing Steel : Meet the requirements of Section 931 utilizing Grade 60 (Black) steel . 548-2 .3 Backfill Reinforcement : For walls utilizing backfill reinforcement, use reinforcement consisting of steel wire mesh, metal strips or structural geosynthetics as required for the wall system chosen . Use steel wire mesh and embedded loops shop fabricated from cold drawn steel wire meeting the minimum requirements of ASTM A 82 , and weld into the finished mesh fabric in accordance with ASTM A 185 . Use steel strips hot rolled from bars to the required shape and dimensions with physical and mechanical properties meeting ASTM A 572 Grade 65 or as shown in the Contract Documents . Use shop- fabricated hot rolled steel tie straps meeting the minimum requirements of ASTM A 1011 /A 1011 M , Grade 50 , or as shown in the Contract Documents . Ensure that steel reinforcing strips , tie strips , reinforcing mesh and connectors used in permanent walls are galvanized in accordance with ASTM A 123 or ASTM A 153 , as applicable . Use structural geosynthetics made of polypropylene , select high density polyethylene or high-tenacity polyester fibers having cross - sections sufficient to permit significant mechanical interlock with the backfill . Use geosynthetics having a high tensile modulus in relation to the backfill . Use geosynthetics having high resistance to deformation under sustained long term design load while in service and resistant to ultraviolet degradation , to damage under normal construction practices and to all forms of biological or chemical degradation normally encountered in the material being reinforced . Do not use uncoated polyester (PET) reinforcements or reinforcements weakened or damaged by high pH environments within the flowable fill . Store the geosynthetics in conditions above 20°F and not greater than 140°F . Prevent mud, wet cement, epoxy, and like materials from coming into contact with and affixing to the geosynthetic material . Rolled geosynthetic may be laid flat or stood on end for storage . Cover the geosynthetic and protect from sunlight prior to placement in the wall system . Carefully inspect all reinforcement, steel and geosynthetics to ensure they are the proper size and free from defects that may impair their strength and durability. 548-2A Attachment Devices : Use backfill reinforcement attachment devices as required by the wall system chosen . 548-2 .5 Joint Materials and Filter Fabrics : 548-2 . 5 . 1 Horizontal Joint Filler : Use elastomeric or polymeric pads/fillers in all horizontal joints between precast components as recommended by the wall manufacturer. Ensure that the pads are of sufficient size and hardness to limit vertical stresses on the pad and concrete surface and to prevent concrete to concrete contact at the joints . 548-2 . 5 .2 Joint Covers : Cover joints and other wall openings with geotextile fabric meeting the requirements of Section 985 and Type D- 5 of the Design Standards , Index No . 199 . Apply an adhesive approved by the Engineer to the back of the precast component for attachment of the fabric material . 548-2 . 5 .3 Alignment Pins : Ensure that pins used to align the precast components during construction are of the size , shape and material required for the wall system chosen . - 157 - FPID ( S ) : 423186 - 1 - 58 - 01