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It is not converted. There can be cases. Reasons random.

i have doubt here that lean is converted into fine powder and place of lean is taken by foundation, it is right that is doesn't take any part in strength as its purpose is to keep the trenches safe from rain water and protecting foundation from soil, but if after a certain time it totally disappears into fine powder then there must be some reasonable settlement.

Plus, lean is also called mud slab in US. Lean is also provided so that there is no slush formation in the ditches if it rains and there is a time delay between foundation pouring and excavation.

well no one can give you each and every detail about how to model it. We can provide you with the basic guidelines and concept, provided that you have the background in using the appropriate options and commands in software. I know we all start learning from zero but you need some one who can train you step by step; may be in your office. I have downloaded your files and if possible i can give you files 2 hrs on weekend to make a tutorial for you! happy?