All archaeological tests are backfilled upon completion of testing. Very large excavation areas area or urban areas are generally backfilled through the use of heavy machinery. Smaller excavation areas are generally backfilled by hand. For smaller tests, soils are tamped by hand and sediments left mounded to settle naturally. If within a maintained lawn area with sod, sod caps are removed at the start of test excavation and replaced after backfilling. If sod cannot be saved or test areas are too large for it to be practical to save and re-use the sod, the backfilled areas are seeded. Paved areas are generally avoided when possible, but if testing must be undertaken within pavement the tests are backfilled and paving can be replaced if requested.