I finally got a 35 year old, 500 gallon oil tank, removed from my property. Its been haunting me for awhile. Eventhough I got all the oil I could out, it still had @ 15 gallons. It surprised me that the contactor only used a smaller skid steer with back-hoe attachment to dig it out. Cost me $2500.00, but, beats having it leak. It started leaking after it was pulled from ground. Apparently, the contractor has to clean it all out and cut it in half before it can be recycled.