UST owners/operators in New Mexico must meet standards in 20.5.106 and must use one of the following methods of release detection at least once every 30 days:
For USTs installed before April 4, 2008:
- Automatic Tank Gauge (ATG);
- Secondary containment with interstitial monitoring;
- Statistical Inventory Reconciliation (SIR);
- Vapor monitoring; or
- Groundwater monitoring
For USTs installed after April 4, 2008, must use interstitial monitoring.
AST owners/operators in New Mexico must use one of the following methods of release detection at least once every 30 days:
- Visual inspection, but only if all portions of the AST, including the bottom, is visible and accessible, if the interstice of double-walled and double-bottomed ASTs is inspected, and if a log of the results is available at the facility.
- Interstitial monitoring
- Automatic tank gauging if the system is third-party certified and the certification has been reviewed and approved by the national work group on leak detection evaluations for use with ASTs
In addition, ASTs must either be in secondary containment or owners/operators must perform a tightness test or internal inspection 10 years after installation or have performed one by 8/15/2004.