New Mexico Administrative Code
Title 20 - ENVIRONMENTAL PROTECTION
Chapter 5 - PETROLEUM STORAGE TANKS
Part 109 - NEW AND UPGRADED ABOVE GROUND STORAGE TANK SYSTEMS: DESIGN, CONSTRUCTION, AND INSTALLATION
Section 20.5.109.904 - AST SECONDARY CONTAINMENT: SINGLE-WALLED TANKS AND PIPING

(1) Owners and operators shall design and construct secondary containment to minimize damage to the surfaces of the tanks due to corrosion, accumulation of water, and stray electrical current.

(2) Owners and operators shall ensure that any regulated substance stored in an AST system is chemically compatible with the secondary containment material. If owners and operators store more than one type of regulated substance within a single containment area, owners and operators shall ensure that the substances are chemically compatible with each other and with the containment material.

(3) Owners and operators shall construct a containment area which has a capacity of at least one hundred ten percent of the size of the largest AST in the containment area plus the volume displaced by the other AST(s).

(4) Owners and operators shall not use clay for the construction of secondary containment.

(5) Owners and operators may use a vault which complies with the requirements of this section as secondary containment.

(1) If owners and operators use concrete for construction of secondary containment installed on or after July 1, 2011, the concrete containment shall be designed and constructed in accordance with an industry standard or code of practice developed by a nationally recognized association or independent testing laboratory, which shall be approved in advance of construction by the department. New concrete secondary containment shall comply with Subparagraph (a), (b) or (c) below:

(2) One of the following shall be used to comply with the concrete secondary containment requirements:

(3) Owners and operators of existing AST systems shall have the option of fulfilling the requirements of this subsection by submitting to the department a report stamped by a professional engineer demonstrating that the secondary containment system is able to contain a release of regulated substances for seven days and properly support the above ground storage tank systems within the secondary containment.

(1) If owners and operators use geo-synthetic membrane for secondary containment, the geo-synthetic membranes or liners shall have a minimum thickness of 60 mils.

(2) Owners and operators shall install liners in accordance with the current edition of an industry standard or code of practice developed by a nationally recognized association or independent testing laboratory approved in advance by the department, or in accordance with the manufacturer's specifications. Owners and operators shall submit to the department a report on the installation of the geo-synthetic membrane which shall certify that the geo-synthetic membrane has been installed in accordance with the manufacturer's recommendations or an industry standard or code of practice developed by a nationally recognized association or independent testing laboratory. The report shall contain the date of the inspection and installation of the geo-synthetic membrane, the test methods used during the inspection, data collected during the inspection, and the standard or code of practice according to which the installation was conducted. An installer or inspector with appropriate certification or experience (which shall be documented in the report) shall prepare the report.

(3) Earthen dike fields shall be lined with a geo-synthetic membrane to qualify as secondary containment.