Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Reference texts: Das & Sobhan, Principles of Geotechnical Engineering (Cengage); Knappett & Craig, Craig’s Soil Mechanics; Holtz, Kovacs & Sheahan, An Introduction to Geotechnical Engineering. Canadian practice: effective-stress, seepage and consolidation methods as summarised in the Canadian Foundation Engineering Manual (CFEM, 4th ed.).