Practical assessment 1-Carry out levelling operations

© Canberra Institute of Technology Page 1 of 13 Date created: 21/06/2022
CRICOS No. 00001K | RTO Code 0101 Date updated: 15/08/2022
Observation/Practical Assessment
Student Name: CIT Number:
Name of Subject:
Carry OutLevelling Operations
NAT ID:
CPCCOM3006
CRN:
Assessment Name Carry Out levelling Part 1
Assessment Date
Student Statement
This assignment is my own work, except where I have acknowledged the use of the works of other
people. I understand that by submitting this assessment electronically, I agree to this statement.
Student Signature: Date:
Privacy Disclaimer
CIT is collecting your personal information for assessment purposes. The information will only be used in
accordance with the CIT Privacy Policy.
Assessor Feedback
Attempt 1 ☐ Satisfactory ☐ Not Yet Satisfactory Date:
Attempt 2 ☐ Satisfactory ☐ Not Yet Satisfactory Date:
Assessor Signature: Date:
Note from Assessor (including any reasonable adjustment):

Student Information
Review the important information below in relation to this assessment task.
Instructions
Assessment Task Instructions for Students
You will be required to complete and submit photos of the following documents to eLearn.
1/ completed rise and fall booking sheet.
2/ completed height of collimation booking sheets.
3/ completed gradient ratio booking sheet.
You will be required to complete the following tasks:
Read and understand all aspect of this assessment including instructions, plans, specifications and
marking requirements and standards before commencing. Complete a JSA (Job Safety Analysis) and
Toolbox talk
Task 1: Complete a “2 Peg test” for accuracy using booking table.
Task 2: Calculate and record the difference in heights of a traverse from a datum point with a change
point using rise and fall method.
Task 3: Calculate and record the difference in heights of a traverse from a datum point using height of
collimation method.
Task 4: Calculate and record distance using Stadia Lines and Staff
Task 5: Clean-up work site, and store materials and tools appropriately.
TASK 1: Check accuracy of optical level using “2 Peg test” method
Before starting work, you will check the accuracy of your optical level. Like in the previous subject you will
measure two points, move the optical level, and measure them again, comparing the results.
 Select a suitable test range for 2 points. It should be roughly the length of a building site (30m-
60m) and flat. You can use flat ground, kerbs, or a tar sealed area.
If you are using a road, make sure a traffic control plan is in place.
 Mark 2 points on the ground with either wooden pegs or marking paint. Indicate which point is
backsight (BS) and which is foresight (FS).

 Set the optical level up according to manufacturer’s instructions about midway along a straight
line between the pegs.
 Place the staff at the BS (backsight) peg, take the reading of the staff through the optical level and
record it in the backsight column of your booking sheet.
 Repeat the process at the FS (foresight) peg and book it (Record in the booking sheet).
In the example table 1 below the BS is 1.425mm and the FS is 1.360mm.
 Subtract the BS from the FS to calculate the rise or fall. If the number is positive put it in the rise
column, if it is negative put it in the fall column
In the example subtracting the BS from the FS (1.425 - 1.360 = 0.065mm.) will find the difference in
height.
Table 1. Example Booking sheetfor reading one
Backsight Intermediate Foresight Rise Fall Reduced
level
Remarks
READING ONE:
1.425 BS peg
1.360 0.065 FS peg
In this example the backsight is more mm than the foresight. This means the Backsight is further away
from the horizontal plane that the level uses to measure (known as the line of collimation).
If it is further from the horizontal plane (line of collimation), the backsight is on lower ground than the
Foresight.
Because the foresight is rising uphill along the ground, the difference is recorded in the Rise column.
 Now Move the instrument close to the BS peg (around 3 metres) on a straight line with the FS peg.
 Take the new readings to the BS and FS pegs and correctly book the readings.
 If the optical level is calibrated properly, there will be a very slight (0-5mm), or no difference at all
between the two readings.

In the picture the angle ‘e’ is the same for a
correctly adjusted level.
You can adjust the line of sight so
that it is the same as the horizontal plane.
The error in an unadjusted level is known
as the collimation error
Table 2. Example Booking sheet reading two
Backsight Intermediate Foresight Rise Fall Reduced
level
Remarks
READING ONE:
1.425 BS peg
1.360 0.065 FS peg
READING TWO:
1.453 BS peg
1.415 0.038 FS peg
Collimation Error = 0. 027
* Collimation error = the difference between the two readings
As you can see in table 2 the collimation error is 27mm (0.065 minus 0.038).
Sometimes the ‘Two Peg Test’ is faulty due to human error so repeat the test again if you feel that
this may be the case.
Some levels are adjustable so read the manuals instructions on how to do this where others are not
and need to be serviced.

Recordyour readings in the booking table below.
Backsight Intermediate Foresight Rise Fall Reduced level Remarks
READING ONE:
BS PEG
FS PEG
READING TWO:
BS PEG
FS PEG
COLLMINATION ERROR =
Table for Optional Second Exercise:
Backsight Intermediate Foresight Rise Fall Reduced level Remarks
READING ONE:
BS PEG
FS PEG
READING TWO:
BS PEG
FS PEG
COLLMINATION ERROR =

TASK 2: Use optical level to transfer levels usingrise and fall method
The rise and fall methodare whenyoumeasure twopointsandcalculate if the secondpointishigher
or lowerthanthe first.
In thisexample are calculatingthe heightdifference betweenthe topandbottomof a setof stairs,but
youcan dothisfor any slope,itdoesnotneedtobe a setof stairs.
 Mark your start and finish points, this is called a traverse. In the example above the start
point is the paint spot at the front edge of the top stair. The finish point is the base of the
bottom step.
 Set up your optical level to manufacturer’s instructions and accurately level it.
 Place the staff at the starting point, this will be your datum.
 Rotate the optical level using the sight guide on top of the level as a guide. Fine tune the
position with the front adjustment knobs and the focus knob on the right side.
 Measure the height and record it in your booking table in the backsight column (backsight
1).
Start Point
Finish Point
Change
Point

 Take 1 intermediate measurement and another halfway to your finish point the 7th step if
you are using the example location.
This halfway point will be the changeover point (foresight 1). Record your measurements
in the booking table.
 Move the optical level to a lower area, making sure the level is above the change point,
and recalibrate it.
 Take another measurement from the change point (backsight 2). Take 1 more
intermediate measurement and your finish point (foresight 2). Record your
measurements.
 Use your results from the booking sheet to calculate the total difference in millimetres
between start point (backsight) and finish point (foresight).
 Check the accuracy of your records with the 3-check method.
Find the total of the foresight column minus the total of the backsight column. This should be
the same as the total of the rise and fall columns of your booking sheet. It should also be the
same as the change in RL.

TASK 3: Conduct levellingproceduresusingheight of collimation method 1
In this task you will be doing a similar exercise as task 2 but instead of calculating the change in
height one point to the next, you will calculate the difference in height from the same point each
time.
The height you are measuring from each time will be the line of sight through the instrument,
otherwise known as the height of collimation or height of instrument.
 Like last time, set out a start (Datum) and finish point approximately 15-20m apart on
sloping ground. For this example, we will be using another set of stairs in front of G-Block.
The RL of the datum is 636.440
 Start by recording the height of your instrument above the datum and put this in the
Backsight column (backsight 1).
 Take an intermediate measurement and another halfway down the traverse, (if using the
steps in the example this is landing). This is the change point (foresight 1). Record your
results in the booking table.
 Change the position on the optical level and recalibrate it.
 Take another measurement from the changeover point (backsight 2), an intermediate
point, and the finish point (foresight 2). Record these in the booking table.
 Use your results in the booking table to calculate the change in height in mm from the
start and finish points.
 Remember to deduct the height of the instrument from your measurements.
Finish Point
Change Point
Start Point

 Use the booking table to record foresights and backsights and calculate the total difference in
millimetres between start point and finish point.
 Check the accuracy of your records with the 3-check method.
Find the total of the foresight column minus the total of the backsight column. This should be
the same as the difference from the first and last reading in the height of collimation column.
It should also be the same as the change in RL.
TASK 4: Use optical level to calculate distance
In this task you will be using an optical level to measure distances.
To do this you will use the lines above and below the crosshair in your optical level.
These are called stadia lines.
 Set out a traverse to measure the distance and set up the optical level behind the starting
point.
The example is the ramp from G-Block towards D-Block (behind the workshop).
 Place the staff at the start of your run and record the height of your upper and lower stadia
lines on your booking sheet.
Lower stadia line
Upper stadia line
Start Point
Finish Point

 Subtract the lower stadia line reading from the upper reading and multiply that by 100. This
gives you the distance of the staff from the optical level.
 Repeat this at the end of your run.
 Subtract the close point from the far point to calculate the length of your run.
 Use either the rise and fall method or the height of collimation method to find the difference in
height from the start and end of your run.
 Divide the length of your run by the total rise from one end to the other to calculate the
gradient of your run.
In the example a sign is displayed indicating the gradient of this ramp exceeds the recommended
maximum gradient of 1:20 (1.0m of rise for every 20.0m of length) for ease of wheelchair use.
The gradient of the run in a ratio is: ____________________________
TASK 5: Clean-up work site, materials, and tools
 All tools and equipment to be cleaned, checked, and returned to stores
 All excess materials to be stowed in racks
 Work site to be cleaned and free of hazards
Time Allowed
8 hours
Assessment Conditions
Assessment will be always conducted in simulated work environment at CIT Bruce under teacher
supervision. If at any stage the Assessor deems the assessment to be unsafe it will be stopped. Access to
all resources, manuals and standards are permitted. All mobile phones are to be switched off. If the
weather is poor on the day of the assessment it may be moved to another day
Materials Provided by CIT
All materials and tools required to complete the task will be provided.
Materials You Need
Pencil, Pen, Personal protective equipment PPE.
Attempts

You may have at least two (2) attempts for this assessment.
 If your first attempt is not successful, your teacher will discuss your results with you and will arrange
a second attempt.
 If your second attempt is not successful, you may be required to re-enrol in this unit.
Only one re-assessment attempt will be granted for each assessment item.
Please refer to the CIT Assessment Policy if you have any questions.
Carry Out Levelling - Observation Checklist Attempt 1 Attempt 2
S NYS S NYS
O1: 1. Student was able to interpret and apply relevant work instruction and complete
all documentation given.
☐ ☐ ☐ ☐
2. Student was able to read and interpret plans, site drawings and specifications. ☐ ☐ ☐ ☐
3. Student completed and agreed to follow JSA and Toolbox talk. ☐ ☐ ☐ ☐
T1: Two peg test
4. Levelling tool set up in accordance with manufacturer’s instruction at mid-way
point
☐ ☐ ☐ ☐
5. Accurately recorded Backsight and foresight ☐ ☐ ☐ ☐
6. Relocated instrument and recorded new backsight and foresight ☐ ☐ ☐ ☐
7. Calculated and recorded Collimation error ☐ ☐ ☐ ☐
8. Optical level accuracy was determined ☐ ☐ ☐ ☐
T2: Rise and fall task:
9. Levelling tool set up in accordance with manufacturer’s instruction at station 1
(datum)
☐ ☐ ☐ ☐
10. Backsight, intermediate points, change points and foresight were recorded. ☐ ☐ ☐ ☐
11. Levelling tool set up in accordance with manufacturer’s instruction at station 2 ☐ ☐ ☐ ☐
12. Backsight, intermediate points, change points, and foresight were recorded ☐ ☐ ☐ ☐
13. Reduced levels for all stations are calculated and levels recorded accurately (rise
and fall method).
☐ ☐ ☐ ☐
T3: Height of collimation task:
14. Levelling tool set up in accordance with manufacturer’s instruction at station 1
(datum)
☐ ☐ ☐ ☐
15. Backsight, intermediate points, change points and foresight were recorded. ☐ ☐ ☐ ☐
16. Levelling tool set up in accordance with manufacturer’s instruction at station 2 ☐ ☐ ☐ ☐

17. Backsight, intermediate points, change points, and foresight were recorded ☐ ☐ ☐ ☐
18. Reduced levels for all stations are calculated and levels recorded accurately
(height of collimation method).
☐ ☐ ☐ ☐
T4: Calculate distance task:
19. Levelling tool set up in accordance with manufacturer’s instruction and checked
for accuracy
☐ ☐ ☐ ☐
20. Stadia lines are identified, and levels recorded ☐ ☐ ☐ ☐
21. Distance is correctly calculated. Tolerance + or
– 5%
☐ ☐ ☐ ☐
T5: 22. The student was observed completing the following tasks during clean-up:
23. Materials, tools and equipment are stored in line with marking rubric and
instructions and work area is left clean and free from hazards
☐ ☐ ☐ ☐

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