How are these contracts being awarded? Are we talking public RFP's? If so, that should have produced competitive rates per project, no? Unless these 'consultants' were already promised the job and the RFP was just a formality, as is in most city contracts.
What makes you think that those rates aren't competitive?
Govt projects have lots of overhead. Some comes from procedures intended to keep them from being cheated. Some comes from trying to make sure that the "right" people get the job. (Some sounds okay, such as"diversity", but is actually a cover for graft.) Some comes from all of the stakeholders. And on and on.