Depth of Cover The depth of backfill and paving directly above an underground storage tank. Depth is measured from the top of the tank to surface or grade. By rhys|2014-10-14T15:48:49+00:00October 14th, 2014|Comments Off on Depth of Cover Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkXingEmail About the Author: rhys