The designated excavation area is 4 meters deep. The site dimensions are as follows: 20 m on the Northern & Southern boundaries, 30 m on the Eastern boundary, and 30 m on the western boundary. The retaining wall system includes components such as 6-meter screw piles, a reinforcement concrete capping beam for each pile with a cross section of 450mm x 550mm x 400mm, and grout injection. Piles are spaced 1.5 meters apart on the Eastern & Southern boundaries and 1 meter apart on the Northern and Western boundaries. The cost of each pile is $2700.00. The grout injection work has been quoted at $55000.00, inclusive of materials. The excavation disposal will be done via a Large Dump Trucks. The trip cost is $75/trip, and the truck have capacity of 35 cubic meters). Consider the excavation for the entire site. The concrete density is 2400 Kg/m3 and the Steel density is 7850 Kg/m3. The concrete volume is 98% of the total volume of the capping beam while the steel volume is 2%. Of the total volume of the capping beam. The price of the concrete is $250/m3 and the reinforcement