In the international standard classification, .dm3 involves: Earthworks. Excavations. Foundation construction. Underground works, Road engineering.
ZA-SANS, .dm3
SANS 10120-3 DM:1981 Code of practice for use with standardized specifications for civil engineering construction and contract documents Part 3: Guidance for design Section DM: Earthworks (roads, subgrade)
SANS 10120DM-3:1983 Code of practice for use with standardized specifications for civil engineering construction and contract documents PART 3 : GUIDANCE FOR DESIGN SECTION DM CONTENTS