Take your tripod down they're not permitted on the beach after 9

A park guard told me to take down my tripod today at Orchard beach? I told the guard I would take it down if I could see the regulation in writing. It could not be produced. I was told the " sergeant " would be producing some documentation. As the guard left I was thinking what an awesome picture I might get if a the police came and forced me to take my umbrella stand down!