UST Soil Cleanup

I recently had a client selling a gas station where the contaminated soil was not removed during a underground storage tank (UST) closure. The potential buyer wanted my client to incur the expense of removing soil. But this is not a requirement for remediation under the Georgia UST regulations and the site has already received a "No Further Action Required". Many developers can go in and redevelop or utilize existing buildings on such property without removing petroleum-contaminated soil. Do you think a seller should have to remediate soil for a buyer?