Elements and Performance Criteria
- Plan and prepare.
- Job requirements are obtained, confirmed with relevant personnel, and applied to planning.
- Work site is inspected, and conditions and hazards are identified and reported as required.
- Health and safety requirements for levelling operations at the work site are confirmed and applied to planning.
- Levelling tools and equipment required for job are selected and checked for serviceability, and faults are rectified or reported before starting work.
- Team roles and verbal and non-verbal communication signals are confirmed, as required.
- Carry out levelling procedures using rise and fall method.
- Instrument is accurately set up and tested for operation before commencing levelling activities.
- Datum point is set up or located.
- Readings are taken from the datum and at nominated or selected stations according to project specifications.
- Backsights, intermediate sights and foresights are identified and levels are booked.
- Instrument is transferred to another location, process is repeated, and change station is recorded in field book.
- Reduced levels for all stations are calculated using rise and fall method of calculation, and accuracy of field book recordings is checked using the three check method.
- Carry out levelling procedures using height of collimation method.
- Instrument is accurately set up and operation and tolerances are checked.
- Datum point is set up or located.
- Level readingsare taken to datum, and the height of collimation is established.
- Readings are taken at nominated or selected stations according to project specifications.
- Instrument is transferred to another location, new height of collimation is established, and change station is recorded in field book.
- Reduced levels are calculated using height of instrument method.
- Reduced levels for all stations are identified from calculations and heights and levels are recorded.
- Accuracy of readings is established using height of collimation method of calculation and three check method.
- Calculate distances using stadia lines.
- Distances are calculated from instrument to stations using staff, stadia lines, and identified factor of levelling instrument.
- Readings and distances are recorded.
- Tools and equipment are cleaned, checked and stored.
- Levelling devices are maintained and stored according to manufacturer recommendations and standard work practices.