You are supposed to have a permit before replenishing beach sand. You can file with DES for a Permit by Notification for the placement of up to 10 cu yd. All sand must be placed above the normal high water line. If you can get clean, washed sand that would be best but there is no legal requirement to use it. The prohibitions are on introducing contaminants and causing turbidity not on the sand itself, so use your judgement as to whether the sand you are getting is appropriate. Beyond that consider slope and wave action when select coarse vs fine sand.
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