Replacement of soft ground on sandy ground performed during the calculation of foundation. What is the right way to set soil characteristics with the respect to wells in PC LIRA? For example, in accordance to geological surveys the first layer consist of fill-up soil. Second and third one are soft grounds (foundation is working therein). Further along are normal soils. Should it be replaced characteristics only of soft ground on sandy one beneath foundation base or perform replacement from the wellhead, i.e. replace bulk soil too?