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the work has the potential to cause significant traffic delays. The existing water line in <br /> Santa Rita Road will have expansion fittings installed on both sides of the bridge to <br /> allow for movement within the approach slab area. <br /> The preventative maintenance at each bridge generally includes methacrylate deck <br /> treatments, replacing joint seals, repairing concrete spalls, epoxy grout into cracks and <br /> other voids. Methacrylate is a concrete deck sealant which decreases the overall <br /> permeability of concrete, sealing and filling cracks to prevent the direct intrusion of <br /> water that causes deterioration of the concrete bridge deck. Joint seals that allow for <br /> expansion and contraction of the bridge are replaced where sections of the bridge meet <br /> each other and/or the roadway. Concrete spall repairs remove corroded concrete from <br /> around reinforcement steel and replace it with new concrete to protect the reinforcement <br /> steel. Epoxy grout injection will place epoxy under high pressure into existing cracks <br /> and other voids to also protect reinforcement steel and prevent corrosion. <br /> The work at each bridge is described further below (see Attachment 4 for location map): <br /> 1) Santa Rita Road Bridge at Arroyo Mocho (Br No. 33C-0099) <br /> The scope of work for this bridge includes: adding approach slabs; installing <br /> expansion fittings on the existing water line; removing existing AC on existing <br /> bridge deck; methacrylate deck treatment; repaving the roadway surface over the <br /> bridge; adding joint seals at Abutments 1 and 3; repairing spalls on bridge deck, <br /> the soffit, and concrete barrier rail; replacing a portion of the concrete barrier and <br /> tubular hand railing; restriping roadway; and reconstructing mortar base at <br /> bottom of chain link fence posts. <br /> 2) Case Avenue Bridge at Mission Creek (Br No. 33C-0453) <br /> The scope of work for this bridge includes: methacrylate deck treatment; <br /> removing and replacing existing expansion joint seals at Abutments 1 and 2; <br /> repairing unsound grout at railing post pockets; and repairing spalls on concrete <br /> barriers, deck, soffit, and abutments. <br /> 3) Laurel Creek Drive Bridge at Laurel Creek (Br No. 33C-0454) <br /> The scope of work for this bridge includes: methacrylate deck treatment; <br /> repairing spalls on concrete barrier rail and bridge deck; replacing existing <br /> expansion joint seals at Abutments 1 and 4; and reinstalling architectural <br /> treatment on the barriers. <br /> 4) West Las Positas Boulevard Bridge at G-3 Channel (Br No. 33C-0461) <br /> The scope of work for this bridge includes epoxy injection of cracks and repairing <br /> spalls in the culvert cells. <br /> 5) Owens Drive Bridge at Chabot Channel (Br No. 33C-0462) <br /> The scope of work for this bridge includes epoxy injection of cracks and repairing <br /> spalls in the culvert cells. <br /> Page 3 of 5 <br />