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Below-Ground Drainage Inspection & Test Plan

ITP for below-ground sanitary and stormwater drainage including bedding preparation, pipe laying, jointing, grade verification and mandrel testing prior to backfill per AS/NZS 3500.2.

13 checklist items
2 hold points
1 witness points
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Checklist Preview

Trench & Bedding

Requires sign-off
P/F
Trench width and depth per specification
P/F
Bedding material type and compaction
#
Bedding thickness (mm)
P/F
Subgrade free of rock and debris

Pipe Installation

Requires sign-off
P/F
Pipe grade verified with laser/level
Hold Witness
P/F
Joint assembly per manufacturer instructions
P/F
Junctions and bends at correct locations
P/F
Inspection openings per AS/NZS 3500

Testing & Backfill

Requires sign-off
P/F
Mandrel test passed (95% nominal ID)
Hold
P/F
Water tightness test satisfactory
P/F
CCTV inspection completed (if specified)
P/F
Backfill material and compaction compliant
Underground marker tape installed

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