Foot valve/check location on water well

I'm thinking about moving my above ground well pump and tank to a better location and building a little pump shed. I think the plumbing and wiring will be easy, but one thing I can't figure out is where the foot valve is located. Does it look like it's somewhere on this loop. The part with the cap is a cleanout for chlorinating the well when necessary. If it's not on this loop, would it be underground somewhere? The loop is pvc, the black stuff is residue from adhesive insulation.