I have a tortoise burrow underneath the concrete slab of my garage. The burrow is two feet wide by 1 ft high by SEVERAL feet long and is curved. As soon as I get the approval to relocate the tortoises,how can I refill the burrow which is very long, curved and would have to be done by hand? Is there anyway to "blow" or "wash" the sand back in so it fills up the huge cavity created by the burrow?? I cannot reach the back of the burrow with the length of a shovel and am not certain exactly how long it is.