Specifications include, but are not limited to: PIPE, CONCRETE, 4 FOOT X 18 INCH ID X WALL THICKNESS OF 2.5 INCHES WITH RING, COVER & HARDWARE, PIPE WILL BE RCP C76 CLASS III, CONCRETE SHALL HAVE A 28 DAY STRENGTH OF 5,000 PSI, STEEL REINFORCEMENT SHALL BE ASTM A615 GRADE 60. On Qualified Products List: EL1310 Approved Manufacturers: CAPITAL PRE 18 INCH TTPBB 4 EA MANHOLE, 36", REINFORCED TONGUE, AND GROOVE CONCRETE PIPE IN ACCORDANCE WITH ASTM-C-478 LATEST REVISION AND ELECTRIC DEPARTMENT DRAWING #7A-1688. On Qualified Products List: EL1311 Approved Manufacturers: CAPITAL; CAPITAL PRE 36 INCH CONCRETE PIPE; HANSON PRO36M3B048000 6 EA MANHOLE, COVER, CONCRETE, FOR 48" TRAFFIC TYPE PULLBOX, 3,000 PSI MINIMUM, ALL REINFORCING SHALL BE #4 BARS AS PER ASTM A-615 GRADE 60, WELDED WIRE FABRIC MAY BE SUBSTITUTED FOR REBAR, IN ACCORDANCE WITH ELECTRIC DEPARTMENT DRAWING #7A-1693. On Qualified Products List: EL1319 Approved Manufacturers: CAPITAL; CAPITAL PRE; HANSON SRO48S00F002N000 4 EA