That's exactly what they do. It really doesnt make any sense, but we dont have any other choice. My degree is in Chemical Engineering and i have been working as an environmental engineer since 2007. Most of my work has dealt with solid waste (landfill, transfer station, recycling, permitting, etc). I took the water resources and environmental section for the 8 hour civil exam. it had ZERO solid waste questions. It was mostly wastewater treatment and groundwater problems for the afternoon. I also took seismic and surveying (neither of which i did in school or at work). I took review classes for all the tests, studied a TON and passed all 3 first try. The process is ridiculous, but doable.