SECTION 509—FLOW ABLE BACKFILL PLACEMENT
509.01 Description
This work shall consist of furnishing and placing flowable fill for use as backfill material in pipe instal - lations or in other uses at locations as designated on the plans or as designated by the Engineer, and as backfill material for plugging designated abandoned pipes and culverts.
509.02 Materials
Flowable backfill shall conform to Section 249.
509.03 Procedures
The Contractor shall mix and transport flowable backfill in accordance with Sections 217 and 249 or by other methods approved by the Engineer. Temperature of flowable backfill shall be at least 50 degrees F at the time of placement. The Contractor shall protect the material from freezing for 24 hours after placement. When used as backfill for pipe installation floatation or misalignment of the pipe may occur while the material is in its plastic state. The Contractor shall maintain correct alignment of the pipe by means of straps, soil anchors or other approved means of restraint. When flowable backfill is used to fill the voids in abandoned pipes and culverts, the pipes and culverts shall be plugged and then backfilled in accordance with the plan details, the VDOT Road and Bridge Standards, or as directed by the Engineer. The flowable backfill materials shall be installed in the aban - doned pipe or culvert in such a manner as not to create voids. When deemed necessary by the Engineer, the Contractor shall submit a plan of operations for the Engineer’ s acceptance showing how the flowable backfill will be placed without voids. The opening for culvert flowable backfill installation shall be sealed with Class A3 concrete conforming to Section 217 or masonry conforming to Sections 204, 218, and 222 as applicable at the completion of backfilling.
509.04 Measurement and Payment
Flowable Backfill will be measured in cubic yards and will be paid for at the contract unit price per cubic yard. When used as backfill material in pipe installations or in other uses at locations as designated on the plans or by the Engineer, this price shall include furnishing and placing flowable backfill, securing the pipe alignment, and for all materials, labor, tools, equipment and incidentals necessary to complete the work. When used as backfill material for plugging designated abandoned pipes and culverts, this price shall include furnishing and placing of backfill material and furnishing and installing plugs. Payment will be made under: ———————————————————————Pay Item Pay Unit———————————————————————Flowable Backfill Cubic yard———————————————————————
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