Arakelian_A._4018A_A5

CPCCBC4018A: Assessment 5 Answer Sheet Please type your answers in black font. (Calibri 12 point) STUDENT DETAILS Student Name: Artak Arakelian TAFE ID: 372655275 UNIT AND ASSESSMENT DETAILS Unit Number: 4018A Assessment No: 5 LA Number: 023628 DECLARATION I hold a copy of this assessment. I have completed all parts of the assessment. I hereby certify that no part of this assessment or product has been copied from any other student’s work or from any other source except where due acknowledgement is made in the assessment. Student’s signature: _________________________________________ (Electronic Signature is accepted) Note: OTEN has the right to reject your assessment if the above declaration has not been completed. LA023628, Assessment 5, Answer sheet, CPCCBC4018A, Ed5 1 © New South Wales Technical and Further Education Commission, 2020 (TAFE NSW), Archive version 2, January 2020

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. Please type your answers in black font. (Calibri 12 point) 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. Both the laser level and automaƟc level require the tripod to be set up onto firm ground. The tripod legs should be extended close to their maximum length but leaving some room to allow levelling individual legs. The legs should be spread far apart to provide a stable base and the sharp ends of the legs plunged deeply into the ground by stepping onto the small plaƞorm at the boƩom of the legs. Both the laser level and automaƟc level are placed onto the top of the tripod and a retaining screw is used to secure the tripod to the level. AutomaƟc Level - Centre the bulls-eye bubble by starƟng with the two foot screws and moving the bubble unƟl it lines up with the third foot screw. - Turn the third foot screw and the bubble will be centred quickly to the bulls eye. - Fine tune the other foot screws as required to ensure the bubble is perfectly in the centre of the bulls eye - Move the automaƟc level 180 degrees and ensure the bubble is sƟll perfectly in the centre of the bulls eye 2 LA023628, Assessment 5, Answer sheet, CPCCBC4018A, Ed5 © New South Wales Technical and Further Education Commission, 2020 (TAFE NSW), Archive version 2, January 2020

It is important to take the last reading back to the original benchmark so that any errors In readings can be determined to be within tolerance. Next, the backsight is deducted from the intermediate sights, and the respecƟve rise or fall is logged in line with the row which had the intermediate sight. If consecuƟve intermediate sights are taken, then the next intermediate sight is subtracted from the last intermediate sight, and the rise or fall is logged in line with the last intermediate sight, or the intermediate site that is being deducted from the previous one. The last of the intermediate sights logged would have the final foresight reading deducted from its own, and the rise or fall is placed in line with the row that has the final foresight Then, the rises and falls are added or subtracted, from the known RL of the benchmark, giving the RL of the next point. This step is repeated with the rise or fall from the next row always added or subtracted from the known RL’s in the row above. This way, the final RL is put in to the reduced level column for the respecƟve observaƟon point. See the diagram below for clarity on the above explanaƟon which contains lines helping to understand the sequence of performing calculaƟons. The acceptable accuracy of the instrument is ±[5 + √(no. of change points)]mm. So for 9 change points, the acceptable accuracy over this many readings would be 5mm + 3mm = 8mm. An automaƟc levels accuracy depends on the magnificaƟon of the telescope. For an automaƟc level with 24 Ɵmes magnificaƟon, the accuracy is said to be + or – 5mm over a distance of 45m - Source; Automatic Levels-Builder's Level-Land Surveying Level (improvedconstructionmethods.com) 4 LA023628, Assessment 5, Answer sheet, CPCCBC4018A, Ed5 © New South Wales Technical and Further Education Commission, 2020 (TAFE NSW), Archive version 2, January 2020

Laser level For a laser level, the instrument is set up to enable reading of the benchmark. The staff is placed onto the benchmark and an audible receiver is then run along the staff unƟl the receivers beeping changes to a flatline. The reading of the staff is taken at the point where the receiver flatlines. The laser level only requires one person to operate it, and the measurements are recorded using the receiver of the laser level, rather than the level itself. Now that the benchmark is set the measurement on the staff is noted down. This can be noted down into the Backsight column. For example if the reading is 1000mm then this is the measurement to find the benchmark of known RL. The known RL is recorded in the column for RL directly across the BS column. Points of interest are logged as intermediate sights. Again the staff is placed onto the point of interest, and the receiver is slid up or down the staff unƟl it flatlines. Foresights are taken to the next change point. The laser level and tripod are re-established and again like the automaƟc level, the first sight (backsight) is taken to the change point (of known value), next intermediate sights are taken. The process is the same except that one operator is required and the laser level is considered to be more accurate, as it removes most of the component of operator error. Also laser levels are intrinsically more accurate, quoted as being accurate to 2.5mm over 30m (versus 5mm over 30m for automaƟc levels) See table below of a typical level run BS IS FS Rise Fall Reduced Level Remarks 1000mm 0.00 BM 1200mm 200mm -0.200 Manhole 1100mm 100mm -0.100 Kerb 1000mm 4000mm 2900mm -3.000 CP1 5000mm 2000mm - 1000mm -4.000 BoƩom of stormwater tank 1000mm 4000mm 0.00 BM LA023628, Assessment 5, Answer sheet, CPCCBC4018A, Ed5 5 © New South Wales Technical and Further Education Commission, 2020 (TAFE NSW), Archive version 2, January 2020

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 (BM) 2.046 3.419 0.777 9.223 CP1 1.798 3.740 1.694 7.529 CP2 4.018 4.126 2.328 5.201 CP3 - Point B (Lot 46) 3.560 1.802 2.216 7.417 CP4 3.648 2.480 1.08 8.497 CP5 2.143 1.505 10.002 Point A (BM) 17.712 17.710 4.801 4.799 10.002 17.710 4.799 10.000 0.002 0.002 0.002 Misclose; Sum BS – Sum FS = Sum Rise – Sum Fall = Final RL – Initial RL = 0.002mm Is this within the acceptable error? Remember, acceptable error = ±[5 + √(no. of change points)] mm Acceptable error = ±5 + √5 mm = ± 5 + 2 mm (taken nearest whole number) = 7mm Therefore the value of 2mm is acceptable LA023628, Assessment 5, Answer sheet, CPCCBC4018A, Ed5 7 © New South Wales Technical and Further Education Commission, 2020 (TAFE NSW), Archive version 2, January 2020

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: 8 LA023628, Assessment 5, Answer sheet, CPCCBC4018A, Ed5 © New South Wales Technical and Further Education Commission, 2020 (TAFE NSW), Archive version 2, January 2020

10 LA023628, Assessment 5, Answer sheet, CPCCBC4018A, Ed5 © New South Wales Technical and Further Education Commission, 2020 (TAFE NSW), Archive version 2, January 2020