Specifications include, but are not limited to: Rehabilitation of 18 prefabricated polymer-lined wastewater manhole bases designed by GU Liner Systems (GU) and distributed by Predl Systems North America, Inc. (Predl). The work includes traffic control; obtaining right of way work permits; confined space entry; wastewater bypass and flow through; required night work; pressure washer, vapor blasting and solvent washing; removal and disposal of GU manhole base materials; drying and stopping infiltration; removal and disposal of corroded concrete; installing stainless steel pins; rebuilding wastewater manhole bases and channels with non-shrink grout; sealing bases with Raven coatings; repairing damaged fiberglass reinforced plastic (FRP) GU base liners; and repairing damaged polypropylene (PP) GU base liners.