On all areas designated in the project specifications to be seeded, the backfills, fills and embankments shall be brought to a subgrade level six inches below finished grade.
When subgrades have settled, topsoil shall be deposited and spread to a finished depth of at least six inches and finely raked, ready for seeding.
If the backfill, fill or embankment material is sand, a four-inch layer of clay furnished by the contractor at his or her expense shall be spread over the subgrade in two layers, and each layer thoroughly mixed into the sand subgrade by disk harrows. After the clay has been mixed with the sand subgrade, leveled and smoothed, topsoil shall be deposited and spread to a finished depth of at least two inches and finely raked, ready for seeding.
Topsoil and clay backfilling shall be taken from excavations made for structures and pipe lines, if suitable soils are encountered. Otherwise, all clay and topsoil shall be secured by the contractor from other sources.
(Ord. 352. Passed 10-22-62.)