D. On getting the saturation stage the drilling little bit is eradicated with casing kept within the borehole. A liner of total depth upto challenging rock / strata is necessary. M.S. or HDP pipe liners are getting used MS liners are nonetheless preferable. The micro pile foundation is mostly used https://wax-co-pure-skin50370.tkzblog.com/30370177/detailed-notes-on-micropile-for-extension