The cover of the dug well shall be made of substantial reinforced concrete at least four inches thick. Other material approved by the commissioner of health may be used. It shall be of sufficient diameter to overlap the casing or side walls by at least two inches. A tight joint shall be provided between the casing and cover. If a pump is set on the slab, the top of the slab shall be sloped to drain away from the pump or drop pipe sleeve.
Conn. Agencies Regs. § 19-13-B51g