When oil goes IN to an oil tank, it's a precious substance for which the oil company charges around $3/gallon. When the tank is decommissioned, what about the oil inside? Well, you get charged for the decomissioning process, but do not get any credit for any viable fuel oil that gets pumped out of the tank. Hmmmm.
Enter Craigslist. A friend of mine went through this process before I did, and pointed out that you can sell all sorts of things there, including used fuel oil! And there are people out there with barrels and pumping equipment who will buy and extract it! At $1.25/gallon, it worked out well for both of us.
And then Filco to decommission. There are 3 options for decommissioning - cap, cap&fill, or remove. Capping simply involves pumping out the residual oil, triple rinsing the tank, then capping the tank below grade. Capping&Filling fills also fills the tank with sand, slurry (concrete) or foam, which is done to prevent the tank from collapsing. Our tank happens to be beneath a concrete slab under the back porch, so there's no need to fill it.
Seattle Fire Code section 3404.2.13 only requires capping, which conveniently is the cheapest option.
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