Specifications include, but are not limited to: COVER, FOR MANHOLE, 30 INCHES, TRAFFIC TYPE DUCTILE IRON IN ACCORDANCE WITH ASTM A536, AND ELECTRIC DEPARTMENT DRAWING #7E289. MUST MEET AASHTO M-306 LATEST REVISION. On Qualified Products List: EL794 Approved Manufacturers: ACCUCAST 270105L; EAST JORDAN 00181956; NEENAH FOUNDRY R-1750 12 EA RING, MANHOLE, EXTENSION, 2", GRAY CAST IRON, TO RAISE ELEVATION OF RING AND COVER WHEN ROAD IS BEING RESURFACED, IN ACCORDANCE WITH ASTM A48 CLASS 30B AND ELECTRIC DEPARTMENT DRAWING #7A1696. On Qualified Products List: EL1307 Approved Manufacturers: EAST JORDAN 00181092; NEENAH FOUNDRY R-1979- 01 6 EA RING, FOR MANHOLE, 30 INCHES, TRAFFIC TYPE DUCTILE IRON IN ACCORDANCE WITH ASTM A536, AND ELECTRIC DEPARTMENT DRAWING #7E289. MUST MEET AASHTO M-306 LATEST REVISION. On Qualified Products List: EL794 Approved Manufacturers: ACCUCAST 270105R; EAST JORDAN 00182013; NEENAH FOUNDRY R-1750