40 CFR § 265.309
Surveying and recordkeeping
June 9, 2020
The owner or operator of a landfill must maintain the following items in the operating record required in §265.73:
(a) On a map, the exact location and dimensions, including depth, of each cell with respect to permanently surveyed benchmarks; and
(b) The contents of each cell and the approximate location of each hazardous waste type within each cell.