Thank you, I do have the poster and it is a handy resource!
The laterals are in a separate layer than the mains. I do have a few other point layers in the dataset. For instance I have a tap layer and I have been testing a combination of these two rules:
1) Taps must be covered by sewer mains.
2) Taps must be covered by endpoint of laterals.
The problem with this, we don't have all taps GPSed/digitized and also we have lots of taps but no laterals (these came from CCTV inspections of the mains) I was hoping there was a simpler way to check the connectivity of the two layers, but maybe I do need to go a different route.
Thanks!