What is the name of your state? NJ. 10 years ago, our family sold a property to new owners. Prior to the sale, we opened, cleaned, inspected, filled and sealed three underground oil tanks. The local township came to our site and inspected the tanks before they were filled and closed. The company responsible for the work gave us a certificate of completion. New, 10 years later, the current owners are selling thier property. They now claim to have found contaminated soil on the land and are suing us for the cost to remove all tanks and all contaminated soil. Do we have any liability since we followed all the necessary steps and inspections 10 years ago when we sold the property to them?