1) Bunker, essentially 2) Cavity 3) Certain excavation hole 4) Hole dug on a beach 5) Hole on the beach 6) Nimby no-no 7) Quarry of sorts 8) Source of gravel 9) Source of mortar ingredient 
A sandpit (Commonwealth countries) or sandbox (US/Canada) is a low, wide container or shallow depression filled with sand in which children can play. Many homeowners with children build sandpits in their backyards because, unlike much playground equipment, they can be easily and cheaply constructed. A `sandpit` may also denote an open pit sand m.....
• (n.) A pit or excavation from which sand is or has been taken.
Sand'pit` noun A pit or excavation from which sand is or has been taken. 
[n] - a large pit in sandy ground from which sand is dug
noun a large pit in sandy ground from which sand is dug