adamp003,
Wow ... so many variables in making an "opinion of probable cost." Your location matters. Your equipment supplier for the package lift station should be able to provide materials costs and likely direct you to a contractor or two. You could use Means. Is the wet well cast-in-place or precast? Precast materials could be obtained from local supplier. A local structural engineer would be able to provide cast-in-place concrete costs (elevated slabs cost more than walls that cost more that slabs -on-grade). Don't forget to include electrical and control costs. Package equipment supplier should be the one to supply duplex controls, level sensors, floats, but wouldn't necessarily provide some of the ancillary items (remote communications-radio transceivers/towers, telemetry equipment, telephone lines, emergency dialers, emergency generators, etc.) Also might have to pay for local power company to run electric lines to you and provide /set transformers.