The last chance to document a buried composite pipe run accurately is the moment before backfill begins. Photographs taken later through excavation cost far more than notes taken now.
Joint Map with Coordinates
Every electrofusion coupling, mechanical transition and branch tee should appear on a sketch tied to fixed site references. Distances from dispenser islands or tank manways work well. Ten years from now, a service technician with this map finds the right spot on the first dig instead of the third.
Depth Profile Along the Run
Record trench depth at regular intervals, especially at road crossings and where drainage swales cross the line. Depth changes where site grading continued after the survey, so measure after final grading when possible.
Tracer Wire Route and Splices
Tracer wire rarely follows the pipe perfectly. Note where it rises to surface boxes, where splices sit and which segments share a circuit. A locatable line is a serviceable line; an unlocatable one waits for a vacuum crew.
Test Records Bound to the Line
Attach pressure test values, drop readings and ambient temperature to the same document set as the drawings. If a section shows slow pressure loss two winters later, the original test data tells the investigator whether the section passed at commissioning.
Storage and Handover
Paper copies age badly in site sheds. Keep a scanned set with the station file and hand a copy to the owner at commissioning. The as-built package is the cheapest insurance the project buys, and it takes an hour to assemble properly.