why dig it in the first place?

Lynn Pietak wrote:

> 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--