Deep excavations and attendances on the installation of the new humus settlement tank. New inlet screening reinforced concrete slab and stepoc retaining walls. Valve chambers, manholes, ductile iron pipework including fittings and valves. SAF reinforced concrete slab and stepoc retaining wall. Service trenches, draw pits and ducts. Brickwork to raise levels of existing tanks, land drainage, steps and footpaths. General landscaping, reinstatement works and grass seeding.