We are the contractor and one of the vendor installed the RMC Plant at our site premises and RMC (Ready mix concrete) is manufacturing and utilising the same site, is it attract excise duty? and sr.No.74 of the NTF.NO.04/2006 DT.01.03.2006 is applicable for this site? But here the vendor is putting excise duty at 2.06% how far it true?