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Back filling for drainage pipe based on AASTHTO

Preparation

Review project plans and specifications.

Confirm the type and size of drainage pipe to be installed.

Ensure all necessary permits and approvals are in place.

Identify the location and depth of the trench for the drainage pipe.

Material Selection

Select appropriate backfill materials as specified in AASHTO.

Ensure backfill materials are free of debris, organic matter, and large rocks.

Verify moisture content of backfill materials meets specifications.

Trench Conditions

Inspect the trench for any standing water or unstable soil.

Remove any loose soil or debris from the trench bottom.

Ensure the trench is wide enough to accommodate the pipe and backfill.

Pipe Installation

Place the drainage pipe into the trench according to manufacturer specifications.

Ensure proper alignment and gradient of the pipe.

Check for any required joints or fittings before backfilling.

Initial Backfill

Begin backfilling with selected material around the pipe, ensuring no damage occurs to the pipe.

Use hand tools or light machinery to place initial backfill material.

Maintain a uniform backfill thickness around the pipe.

Compaction

Compact backfill material in layers, as specified in AASHTO.

Use appropriate compaction equipment to achieve required density.

Measure compaction using a density gauge or other approved methods.

Final Backfill

Continue backfilling to the surface, ensuring proper compaction throughout.

Avoid overfilling or creating mounds above the finished grade.

Monitor for any signs of settlement during the backfilling process.

Site Restoration

Restore the surface to match surrounding conditions.

Replant vegetation or install erosion control measures as needed.

Clean up work area and remove any excess materials.

Documentation

Record all materials used and compaction test results.

Document any deviations from the original plans and specifications.

Complete a final inspection and obtain necessary approvals.

This checklist should cover the essential steps for backfilling drainage pipes following AASHTO guidelines.

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