Please see the following key…

Please see the following key points regarding our comments on the draft version of MTO SP599S22. Other various comments have been provided in the attachment. Thank-you.

1) Global stability vs. External stability.
- Global stability and foundation capacity should be checked and confirmed by geotechnical
engineer
- External stability including sliding and eccentricity checked and confirmed by supplier based on
specified backfill parameters

2) Working drawing submissions
- Take-off for backfill quantities should be completed by the contractor and included in a
submission separate from the RSS wall drawings. RSS wall supplier should not do quantity take-
offs for backfill
- Statement of external stability (sliding and eccentricity) can be provided on working drawings
although confirmation of foundation capacity and global stability should be part of separate
submission completed by geotechnical engineer

3) Inspection reports
- Clarity may be required on the difference between "Contractor's Engineer" and the wall
designer/supplier. We recommend a neutral third party QVE complete the inspection reports.

4) Manufacturer's Representative
- We believe that the manufacturer's representative should be on site (3 days total) per RSS item to
aid in the start up of installation. This should include placement of panels, soil reinforcement and
placement/compaction of backfill.