A contractor needs to order ready-mix concrete for a continuous strip footing. The footing is $30 \text{ m}$ long, $0.8 \text{ m}$ wide, and $0.4 \text{ m}$ deep. To account for uneven trench excavation, concrete left in the pump hopper, and general spills, the contractor applies a $5\%$ waste factor to the neat line volume.

Determine the total volume of concrete the contractor should order from the batch plant.

A reinforced concrete retaining wall needs to be poured. The exposed section of the wall above the footing is $15 \text{ m}$ long and $3 \text{ m}$ high. The concrete requires formwork on both the front and back vertical faces to hold its shape during curing.

Calculate the total square meters of formwork required for the wall.

An exterior concrete shear wall is $10 \text{ m}$ long, $3 \text{ m}$ high, and $0.2 \text{ m}$ thick. The architectural plans show a single large window opening in the center of the wall that is $2 \text{ m}$ wide and $1.5 \text{ m}$ high.

The estimator must calculate the net volume of concrete required for the wall, and the net contact area of formwork required for both the interior and exterior faces of the wall (excluding the window opening). Formwork for the inner edges/sills of the window opening is ignored for this specific takeoff.

A $15 \text{ m}$ long concrete grade beam requires four continuous longitudinal #6 rebars (nominal diameter $19 \text{ mm}$). According to standard steel charts, a #6 rebar weighs $2.235 \text{ kg/m}$. To ensure structural continuity, the rebar must span the entire length, and the structural engineer requires a total of $3 \text{ m}$ in lap splices along the entire run of the beam.

Calculate the total weight of #6 rebar required for this beam.