Could you clarify a few points?
1) How is a 5-ft. deep trench, open it's entire length, considered a 'confined space?'
2) What sort of voltage and current are the cables using?
3) How do you plan to get the sand out from around the cables?
4) What condition do you expectthe sand to be in? Wet, with mud mixed in? Clean and dry?
5) What is 'sweet' sand? Is it like beach sand, or perhaps like decomposed granite (cannot be compressed)?
