<font color="blue"> ...as I remember, I ran copper off the tank and pvc underground... </font>
That's correct. When running platic pipe underground, you have to use risers that can take the abuse and harsh envirnoment above ground. Imagine eager grounds maintenance with an agressive weed eater...also, underground lines are to be at least 24" deep, and must have a trace ribbon installed with the plastic so the line can be detected. If the plastic pipe isn't yellow, then the ribbon should be yellow.
That's correct. When running platic pipe underground, you have to use risers that can take the abuse and harsh envirnoment above ground. Imagine eager grounds maintenance with an agressive weed eater...also, underground lines are to be at least 24" deep, and must have a trace ribbon installed with the plastic so the line can be detected. If the plastic pipe isn't yellow, then the ribbon should be yellow.