Slurry mix wall (for noise restrictions/obstructions) grab excavation to full depth, fill with cement or bentonite mix, drop and hold sheet piles in place. Excavation 1 panel (4.5 m long on plan) with grab and crane. Excavate 1 panel in 2 days + 1 day bentonite and sheet pile, giving a rate of 1 - 1.5 m/day. Therefore, once started 2 - 2.25 m/day is expected.