I live in Oregon where it is required that residential underground oil tanks that are no longer in operation must be tested for ground leakage prior to the sale of a home.
I own a duplex that has two such oil tanks(I put in gas furnaces about 15 years ago).
I had both tanks drained by a company that offered that service. I did not "decommission the tanks" by either (a) having the tanks removed from the ground and the surrounding soil tested for oil contamination or (b) having the tops of the tanks cut off and a slurry put in that hardens into a cement like substance and having the surrounding soil tested for oil contamination.
My plan was to live in this place till I died and because my property is on a raised lot, it would have been virtually impossible(and very expensive) to get any power digging equipment up here.
But of course plans change(I recently became married) and now plan to move.
Is there a way that I can personally test the ground around the tanks to determine if there in fact has been any leakage that would show up as ground contamination?