Answer Happy

(b) The following are variation instructions given during a project's construction period. Apply the rules for the valuation of variation, and calculate the cost of variation. Assume that the Public Sector Standard Conditions of Contract (PSSCOC) for construction works (8th Edition, 2020) is used for the contract. Marks 5 1 Description Pour additional 150 m of concrete grade 35 to basement slab after 8pm due to heavy rain. Information Schedule of rate: Supply and lay concrete grade 35 to basement slab is $160 per m3. Breakdown (SOR) for concrete grade 35 is: Material 60%; Labour 25%; and Plant & profit 15% Overtime rate (after 5pm) shall apply. 2 5 . . Supply and lay artificial grass to replace the existing cow grass to open field. (Area of field: 1,385 m²) Replace homogeneous ceramic tiles with granite tiles at 1st storey lift lobby area. (Lobby size: 5 m x 5 m) Schedule of rates: Supply artificial grass - $3.00/m² Laying or removing grass - $2.50/m² Remove excavated material from site - $3.50/m2 Schedule of rates: Supply and lay ceramic tiles - $35/m² Supply and lay granite tiles - $65/m² 3 5 . . Market rate: Supply and lay granite tiles - $55/m²