Questions
Would it be ethical for Engineer A to also discuss constructability issues with a local contractor, Contractor B, with whom Engineer A has worked and who may potentially also bid on the water...
Conclusions
It is unethical (and perhaps illegal) for Engineer A to privately discuss constructability issues with Contractor B or any contractor who may bid on the water treatment facility construction contract following the design phase. Instead, Engineer A could conduct a publically advertised constructability meeting, inviting all interested contractors to provide Engineer A with the input necessary to achieve a better design and construction outcome. Engineer A may also want to consider hiring a consultant to advise on constructability issues.