An underground storage tank system (UST) is a tank and any underground piping connected to the tank that has at least 10 percent of its combined volume underground. The federal UST regulations apply only to UST systems storing either petroleum or certain hazardous substances.
When the UST program began, there were approximately 2.1 million regulated UST systems in the United States. Today there are far fewer since many substandard UST systems have been closed. For the most current statistics, see UST Performance Measures. Nearly all USTs regulated by the underground storage tank requirements contain petroleum.
The following procedures were taken by GECR representatives for UST activities:
- GECR Managers and Supervisors oversaw the removal and disposal of three 8,000- gallon USTs previously containing gasoline.
- Prior to UST activities, a Health and Safety Plan (HASP) was created for all closure activities.
- All permits and proper documentation was obtained.
- Oversight was performed for washing and rinsing of tanks and containerized washings for disposal.
- GECR directed and supervised the emptying, removal, and disposal of all piping, vent pipes, feed lines, etc.
- Samples were collected from floors (front and back) of cavity and submitted, along with trip blank, to qualified laboratory under chain of custody for analyses of gasoline parameters. All samples were maintained at 4 degrees Celsius in a cooler.
- GECR evaluated the laboratory results and advised the client the status of the site and made recommendations.