There're some phrases in the latest PDF that have me alarmed, probably more my lack of knowledge than anything else:

"Many samples have been taken from the excavated ditch within the tunnel (60 litres at regular intervals). "

That sounds like a lot of original material being extracted - this is still a repair job isn't it?

I'd be grateful if anyone could shed light on what this actually means too:

"As well as this, two sets of seven monolith samples were taken from the ditch section.""

Cheers, WA