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Why is the filter so low to the ground? It's only a couple of inches from the lateral line.
Are the pipes only 3 inches under the ground or are you going to bury the filter? Or both. Does the dripline require a pressure reducer? Where is it?
You already have anti-syphon valves. You don't need those black things at all. He might have those things in there because the valves are lower than the sprinklers and maybe the black things will keep the valves from draining too much. They look like they're in a good location for draining though. Oops I guess I did comment on the height difference. I'm still not going to say they're not up to code because of the height of the valves.
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Elevations completely change the rules. You do not use antisyphon valves to feed lines that flow to points uphill. Also, in any event, you do not install check valves downstream of antisyphon valves.
The equipment shown in the photo screams Amateur Hour to me.