American Society for Testing and Materials (ASTM). Current edition approved Nov. 1, 2008. Published December 2008. Originally approved in 1982. Last previous edition approved in 2002 as A 807/A 807M - 02. 7 p. This practice covers procedures, soils, and soil placement for the proper installation of corrugated steel structural plate pipe, pipe-arches, arches, and underpasses produced to Specification A 761/A 761M, in either trench or embankment installations. A typical trench installation and a typical embankment (projection) installation are shown in Figs. 1 and 2, respectively.