Underground Storage Tank Assessments UST closure via removal by a trackhoe excavator Excavation of an UST in Charleston, SC Due to their widespread use and the often hazardous nature of their contents, Underground Storage Tanks (USTs) are highly regulated. Lorris Environmental has extensive experience in UST installations, closures, post closure assessments, and remediation. This experience includes conducting State Underground Petroleum Environmental Response Bank (SUPERB) funded site assessments. For more information regarding UST installations, closures, post closure assessments, or remediation, please contact us by phone at (803) 252-2288 or by e-mail through the links on the "Contact Us" page.