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3. Rhaid i'r bwnd a sylfaen y fan—
(a)bod yn anhydraidd i ddŵr ac olew; a
(b)bod wedi'u dylunio a'u hadeiladu fel bod ynddynt ddigon o gryfder a chyfanrwydd strwythurol fel eu bod gyda gwaith cynnal a chadw priodol yn debygol o barhau felly am o leiaf 20 mlynedd.
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