Hi,

underneath is clay.  It's very tough stuff, digging it out was quite hard.

Cheers

Ian


ChrisAtUpw@....... wrote:
> In a message dated 2008/03/10, ian@........... writes:
>
>> My sensors are in a double skinned wooden box, surrounding the 
>> concrete pad, about a meter cubed,
>
>
> Hi Ian,
>
>        What is underneath the concrete pad? This is relatively small 
> for a Lehman unless it is on solid rock.
>
>        Regards,
>
>        Chris Chapman 
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