Well System Operation Questions
Hopefully someone can shed some light on whats going on here and tell me if its a problem or just a minor annoyance.
Whats happening: The system is primed at 70psi. You start using water. The pressure goes down. Cut in pressure is set to 60psi. Drive kicks on. Pressure keeps dropping. Drops all the way down to about 15psi. I've counted and it takes about a solid 10s from the time the drive kicks on until water gets up to the pressure tank. Basically the "problem" is how long its taking the water to reach the house.
The system: I just bought the house about 18 months ago and I'm new to wells so here's what I know. Well was drilled in '09. From what I know its the original pump. Unsure of the size but based on the well depth and how the drive is setup I'd guess 1.5hp. Well is 620ft deep. Pump is at 320ft with a static level of 275ft (in '09). Well yield was 40gpm and pump was producing 10gpm. The original drive took a shit on me last fall and I had a Franklin Electric Subdrive Connect installed. I've got the cutout pressure set at 70psi and the cut in pressure set at 60psi. Pressure tank is set at 58psi. I set a 10psi difference just so I can get the drive started sooner to reduce the pressure drop. I can't remember if this problem was happening with the old drive or started with the new one.
Obviously I'm trying to self diagnose without paying a well company to come in thats gonna tell me they can't do anything without pulling the pump for an inspection. So the only thing I've done myself is check the check valves. I shut off the valve after the manifold and killed the drive. Did this at 5am and when I came home at 7pm (14hrs later) the pressure had only dropped 1psi. I'd assume that means the check valves are good(ish)?
What else could be my problem here?