Hi-

I'm preparing a work plan for Phase II testing at an urban HAZMAT (former
manufactured gas plant) site and am looking for  ideas on how to trench and
examine deposits which could go as deep as 10-20 ft.  Given conditions on the
site, I am not permitted to step-trench or to use sloping.  I'm considering the
use of video equipment so we don't have to get into the trenches and welcome any
thoughts or experiences on that or various types of shoring, box trenching, etc.
 Thanks--