The work involves extensive civils and p/w since, the track has to drop from the present embankment level, some 5m above the adjacent road, to the floor level of the new tunnel [the 'cut & cover' section of which, is, I guess, about 10m below it.
Source: wiktionary
Our [ISO] 9000 (etc) accreditation extends, so far as I am aware, to cabling, ducting, poling and other civils activities.
Source: wiktionary
Conreate bases, ducts and minor civils […] bases for structures, in situ concrete bases, including holding down bolts and fixings.
Source: wiktionary