I do not belive that the PLOT PLAN will show where things like Gas Lines, Sewer or Septic Lines, Water lines and such will be located only your original Blueprints.
There may be a set of Blueprints at the Recorder's Office if the property is not too old. (They only keep them for so many years.)
It seems to me that he is asking you to do part of HIS job: This is part of "Pulling Permits" and if you are paying him to do it......
It seems to me that this is not that complicated, you dig a trench, 6 inches deep, carefully, and you lay the PVC. It is not rocket science!
Good luck and may God bless
Plot pland ans survey are one in the same. You should hopefully have a copy of your survey. He needs this to make sure he is installing within property boundaries and to measure scale of distance for heads.
If you do not have a copy of the survey the Title co. who handled your closing may be able to help. Also the survey company will have it if you know who they are.
Stephen B. McClain, Broker Owner
Cornerstone New Home Solutions