Work Continues at Palo Verde Nuclear Generating Station

For funding reasons at Arizona Public Service (APS), the original $1.3 million Make-Up / Blowdown Hypochlorite Trench Structures project was broken into two phases.  The first phase, “Trench #20” started in late 2015 and the second phase, “Trench #2″ started in early 2016.  The scope of work included digging two large trenches (315 LF and 140 LF, respectively) that were then compacted.  Each trench required outfitting of rebar-reinforced, precast, concrete vaults running the entire distance to house pipes carrying sulfuric acid and water to the main cooling towers.  Pipe sizes ranged from 1/2″ to 4” in diameter.  Once piping was installed, the entire system was checked for leaks and inspected.  The final phase of the project included the forming of cast-in-place concrete lids for the entire system that included steel grating for maintenance access.