The document discusses specifications for earthwork supports and excavation works. It defines various types of earthwork supports such as sheet piling, contiguous piling, secant piling, etc. and states that they should each be measured separately according to different sections. It also defines earthwork support as providing supports to uphold excavation sides by any means other than sheet piling. Disposal and handling of excavated materials both on and off site is covered, including requirements for measurement and description. Filling materials are classified into those from excavations, selected excavated materials, and imported materials. Measurement of filling is defined as equal to the void to be filled.