Nick
What city/county does this take place in?
A few years ago, we encountered something similiar in S.B. County, on a 7.2kv system install. Ductbank consisted of (6) 5" db-120, concrete encased pvc, with 3- 7.2 feeders.A depth of 7' to top of encasement was required per plan. Trench box, and storm pumps for the high water table were required. At the time, couldnt understand the 7' depth, when 5' is usually standard. Never a mention of this increased depth.
Months later, long after the original project was complete, they "added" a rather large fountain and pool over this area.
Just makes you go hmmmmmmm....
NS4Me
By the way, Im curious. Do you work for MM ?