Construction Program Management and Inspection Guide

SAMPLE
5.4.5 – Backfill Material for Pipes*
Quality
QC Sampling and Testing Requirements
Sublot Size/
Test Point of Sampling
Characteristic Test Method(s) Lot Size Frequency Sampling Method
Total Quantity of
AASHTO T11 Backfill Material 1 Sample/ From In-Place Random
Gradation AASHTO T27 Type / Source / 1,000 m 3 Lift of Backfill T2, T248
Project Segment
Maximum Dry AASHTO T99 Total Quantity of
Density and (Method C) Backfill Material 1 Sample/ From In-Place Random
Optimum AASHTO T180 Type / Source / 1,000 m 3 Lift of Backfill T2, T248
Moisture Content (Method D) Project Segment
Total Quantity of
Maximum Backfill Material Minimum From In-Place Random
Stone Size Visual/Tape Type / Source / 4/Lift/Day Lift of Backfill Visual
(< 75 mm) Project Segment
Total Quantity of
Maximum Rod/Grade Backfill Material Minimum From In-Place Random
Lift Thickness Stake Type / Source / 4/Lift/Day Lift of Backfill Visual
(< 150 mm) Project Segment
Gravel Borrow:
1 Sample/100 m
of Trench, but
not less than
1/Lift/Day
In-Place Total Quantity of From
Density and AASHTO T310 Backfill Material Ordinary Borrow: Compacted Random
Moisture Content (Method B) Type / Source / 1 Sample/100 m Backfill T310
(Per Targets) Project Segment of trench, but
not less than
1/Placement
Location/Day
(*) Backfill Material for Pipes will include Gravel Borrow and Ordinary Borrow to be
placed as follows:
Gravel Borrow – Gravel Borrow shall be used for bedding and backfilling of pipe
to a point 600 mm above the top of pipe.
Ordinary Borrow – Ordinary Borrow shall be used to backfill the remaining
depth of trench from the top of the Gravel Borrow to the top of the finished
subgrade.
Appendix B: Quality Assurance Resources
CONSTRUCTION PROGRAM MANAGEMENT AND INSPECTION GUIDE (5/01/04)
B–37