supply of material under the conservation of ancient tank in western side at qutub complex, new delhi as specified in the boq. supply of material under the conservation of ancient tank in western side at qutub complex, new delhi as specified in the boq. , conservation work , unslaked lime ( unslaked and airtight packing is a must ) , surkhi ( made of jhama or first class brick in gradation as required by site in-charge ) , coarse sand ( free from clay, silt, organic matter, and other foreign particles ) , belgiri ( dried form and in proper packing ) , gur ( dried form in proper packing ) , gum ( dried form in proper packing ) , san , dq stone ( size will be as per instructions given by the site or engineer-in-charge ) . also, the surface of the stone must be free from any clay / dust / cement layer / etc. ( means the fresh surface of the stone texture ) . , brick aggregate 20 mm nominal size ( in proper gradation as required by the site in charge ) , tractor trolly ( having minimum 04 cum cubical volume ) , collection of the ornamental / decorative stone ( shifting charges from one point to another point )