CFR /  Title 40  /  Part 265  /  Sec. 265.309 Surveying and recordkeeping.

The owner or operator of a landfill must maintain the following items in the operating record required in Sec. 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.