Prior to overlay we do necessary for depth patches on the deck and parapet wall. My question is has anyone seen a start up company that uses the hydro blasting method to knock out the full depth patches? In Illinois our spec for pressure is 16,000PSI, we had a section on the bridge deck that was to be removed so we asked the hydro company if they could blast through it to see if the bars would be damaged. Surprisingly they were not, if anything they were cleaned off perfectly, ready to be reincorporated into the Rehabilitation of the bridge, the edges of the patch were less damaged compared to jack hammering leaving the surrounding concrete significantly more sound and undamaged not to mention it would cut down on time. If anyone finds this interesting give me a reply. I’m currently looking into this and would love to hear someone else’s thoughts