I got my Bachelor's in Land Use Planning/GIS from Metro State, under the Environmental Science department, and I think it was a pretty good program. You and I are a little opposite, as I'm in the commercial HVAC controls field and do a lot of new construction, including managing my projects, and have never used my degree. Definitely worth looking into, plus it's a lot more affordable than CU or CSU.
We have an environmental engineering degree at Colorado School of Mines. It is actually a quickly growing field, and we have some pretty good teachers at the school in that field from what I hear. I had one environmental class with one professor with a ton of experience in the field, overseas. Look into it!