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730 MOVEMENT MONITORING
• Method: Contractor's choice by agreement.
• Accuracy of reading: site specific but generally +/- 1mm.
• Critical movements:
- Action values: site specific.
- Trigger values: site specific.
• Precautions: Take as follows if movements reach critical values:
- Trigger: Review situation, assess possible causes and submit proposals.
- Action: Stop work and revise working procedures to limit further movements.

740 CRACK MONITORING
• Method: Contractor's choice .
• New or extending cracks: Mark extent and record date. Report and make
proposals for additional monitoring points.
• Period of monitoring: Until cracks are made good.

750 FREQUENCY OF MONITORING
• Initial readings: Commence readings as soon as survey points have been
established. Repeat readings daily until two consecutive sets of readings are stable
and consistent and thereafter weekly until retention structure is installed.
• Post-erection readings: Immediately after erection of retention structure repeat
readings. If these differ from previous readings, repeat until two consecutive sets of
readings are stable and consistent.
- Period between sets of readings: One week.
• Frequency of subsequent monitoring: weekly until façade is tied back to new
structure, thereafter monthly until end of contract period and annually in
maintenance period.
• Increase frequency of readings:
- If movements are accelerating.
- If the trend of movements changes unexpectedly.
- While excavating adjacent to façade or retention structure.
• Additional monitoring: Take a set of readings immediately following:
- Exceptionally high winds.
- Impact on façade or supporting structure.
- Unauthorised or significant authorised amendment of retention structure.

770 MAINTENANCE CERTIFICATES
• Submit: Within 24 hours.
• Include:
- Inspection details: Date, time and climatic conditions.
- Monitoring results: In tabular and graphical form.
- Record of:
Any variance from anticipated condition.
Any deterioration in façade condition.
Remedial work carried out to retention structure.
- Recommendations: Action necessary to maintain condition of façade.
- Confirmation of:
Current adequacy or otherwise of retention structure. Whether visual inspections
have been carried out daily.

RotF generic (intermediate) NBS 2014 6118-AEW-XX-XX-NBS-A-01