CPCCBC4018A Assessment 5: Site Surveying, Levelling, and WHS Hazards

This assignment solution addresses the requirements of CPCCBC4018A Assessment 5, focusing on site surveying and levelling techniques. The document provides detailed procedures for setting up and using laser and automatic levels, including how to determine and record levels, and comments on the accuracy of these instruments. It outlines the two-peg test procedure, step-by-step, with sketches, and provides a worked example of a level run, including booking readings, reducing levels to determine the Reduced Level (RL) of Point B, and performing accuracy checks. The solution also identifies and discusses WHS hazards and risks encountered during site survey and set-out tasks, proposing possible solutions and precautionary measures. The calculations and answers provided demonstrate a comprehensive understanding of the unit's competencies.

CPCCBC4018A: Assessment 5
What you have to do
For this assessment, read the questions below and answer.
How you will be assessed
The questions in this assessment cover a number of areas within the unit of competency
You will need to show that you are competent across all the areas contained in this
assessment.
YOU MUST show all workings where you have done calculations.
Question
1. Levelling on building sites is usually carried out using:
 Laser level or
 Automatic level
For both of these instruments, outline in point form, the setup procedure to level
the instruments ready for use.
Detail how you would determine and record the levels using these instruments.
Comment on the accuracy of these instruments.
Automatic level
 Set up the tripod stand by releasing the strap holdings to unhook the clamp
on each leg then extend them to a comfortable height and fasten the
clamps.
 Fix the legs firmly into the ground and ensure that the top surface of the
tripod is fairly level.
 Place the instrument on top of the tripod and fix it using the screw beneath.
 Level the instrument by adjusting the levelling screws until the bubble is at
the centre of the circle.
 Further adjust by use of levelling screws to increase accuracy.
 Rotate the instrument to ensure that it maintains the level.
Laser level
LA017615 Assessment 5, CPCCBC4018A, Ed 4 1
© New South Wales Technical and Further Education Commission, 2018 (TAFE NSW), Archive version 3, April 2018

 Set up the tripod stand by releasing the strap holdings to unhook the
clamp on each leg then extend them to a comfortable height and fasten
the clamps.
 Fix the legs firmly into the ground and ensure that the top surface of the
tripod is fairly level.
 Place the instrument on top of the tripod and fix it using the screw
beneath.
 No need to centre the bubble because the instrument will automatically
level itself.
How to determine and record the levels.
 Start at the control point.
 Outspread the staff straight up and swing from side to side. Record
the lowest reading where cross hairs intersect.
 This measurement is recorded in the backsight column.
 Move the staff to a new location and record the measurement in the
intermediate sight column. Record a remark on all positions
measurements are taken.
 Relocate the level to a different location to obtain more readings and
record them in foresight column and in the remark column record
“change point”.
 The first observation from the new position to the staff will fall
under backsight column.
These levelling instruments are very accurate although errors may arise
during measurement. User error may arise due to incorrect set up of
instrument as well as staff not held vertically. Collimation error may be
brought by errors in readings when cross hairs are not in line with the
optical axis.
2. Outline the procedure to carry out the two peg test prior to using an
automatic level.
The step by step procedure should be aided by the use of sketches and clearly
outline the process in detail and site staff to follow.
 Set up the automatic level as explained in question 1.
 Set a peg 37.5 metres away on both directions from the tripod.
 Label one peg X and the other Y.
 Take a backsight reading of peg X (R1) and a foresight of peg Y (R2).
Subtract R2 from R1 and note the results.
 Relocate the instrument from the centre and set it up 1.5 m from X to
obtain readings R3 and R4.
 Obtain the readings of R3 and R4 and obtain the difference. Record.
2 LA017615 Assessment 5, CPCCBC4018A Ed 4
© New South Wales Technical and Further Education Commission, 2018 (TAFE NSW – WSI), Archive version 1, April 2018

3. The attached diagram depicts a level run. From the attached diagram of the
Level Run, book the readings and reduce the levels to determine the RL of Point B.
Carry out all checks to confirm the accuracy of the run.
BS IS FS Rise Fall Reduced
Level
Remarks
2.642 10.000 Point A
2.046 3.419 0.777 10.777 CP1
1.798 3.740 1.694 12.471 CP2
4.018 4.126 2.328 14.799 CP3
3.560 1.802 2.216 12.583 CP4
3.648 2.480 1.080 11.503 CP4
2.143 1.505 9.998 Point A
17.712 17.710 4.799 4.801 10.000
17.710 4.799 9.998
0.002 0.002 0.002
Misclose =0.002 m = 2 mm
Is this within the acceptable error?
acceptable error = ±[5 + √(5)] mm = ±7 mm
LA# Assessment 1; CPCCBC4018A Ed1 3
© New South Wales Technical and Further Education Commission, 2013 (TAFE NSW – WSI), Version 1,
November 2013

4. Outline the WHS hazards/risks encountered on site while conducting site
survey and set out tasks.
You will be required to identify and list approximately 8 hazards and discuss any risks
and consequences associated with each hazard. Where appropriate suggest possible
solutions or precautionary measures to avoid and or prevent the hazard. You may use
a table format as follows:
Assessment checklist
I have:
 Completed ALL questions in this assessment.
 Included my name, student number, unit number, assessment number
 Reviewed and spell checked my document
 Saved a copy of the assessment on my own computer
4 LA017615 Assessment 5, CPCCBC4018A Ed 4
© New South Wales Technical and Further Education Commission, 2018 (TAFE NSW – WSI), Archive version 1, April 2018

LA017615 Assessment 5, CPCCBC4018A Ed 4 5
© New South Wales Technical and Further Education Commission, 2018 (TAFE NSW – WSI), Archive version 1, April 2018