New Mexico Administrative Code
Title 20 - ENVIRONMENTAL PROTECTION
Chapter 5 - PETROLEUM STORAGE TANKS
Part 115 - OUT-OF-SERVICE STORAGE TANK SYSTEMS AND CLOSURE
Section 20.5.115.1504 - ASSESSING THE SITE AT CLOSURE OR CHANGE IN SERVICE

(1) In selecting sample types, sample locations, and measurement methods, the bureau shall consider the method of closure, the nature of the stored regulated substance, the type of backfill for any USTs, the depth to groundwater, and other factors appropriate for identifying the presence of a release. Examples of sample locations may include but are not limited to piping junctions, under dispensers and under storage tanks.

(2) A bureau inspector may waive the requirement for soil sampling when an AST is closed or may require alternate tests for the presence of a release, based on site specific conditions that demonstrate equivalent environmental protection. For example, at a site where an AST has been operated for less than 10 years with impervious secondary containment, the inspector may waive soil sampling as the secondary containment would have effectively prevented any release outside the containment. The bureau may require soil sampling or a site assessment at a later date if site-specific circumstances indicate that a release may have occurred.

(3) The requirements of this section are satisfied if one of the external release detection methods allowed in 20.5.108.806 NMAC and 20.5.108.807 NMAC is operating in accordance with the requirements in 20.5.108 NMAC at the time of closure, and indicates no release has occurred.