Section 25290.1 Of Chapter 6.7. Underground Storage Of Hazardous Substances From California Health And Safety Code >> Division 20. >> Chapter 6.7.
25290.1
. (a) Notwithstanding subdivision (o) of Section 25281, for
purposes of this section, "product tight" means impervious to the
liquid and vapor of the substance that is contained, or is to be
contained, so as to prevent the seepage of the substance from the
containment.
(b) Notwithstanding Sections 25290.2 and 25291, every underground
storage tank installed on or after July 1, 2004, shall meet the
requirements of this section.
(c) The underground storage tank shall be designed and constructed
to provide primary and secondary levels of containment of the
hazardous substances stored in it in accordance with the following
performance standards:
(1) Primary containment shall be constructed, operated, and
maintained product tight and compatible with the stored product.
(2) Secondary containment shall be constructed, operated, and
maintained product tight. The secondary containment shall also be
constructed, operated, and maintained in a manner to prevent
structural weakening as a result of contact with any hazardous
substances released from the primary containment, and also shall be
capable of storing the hazardous substances for the maximum
anticipated period of time necessary for the recovery of any released
hazardous substance.
(3) Secondary containment shall be constructed, operated, and
maintained to prevent any water intrusion into the system by
precipitation, infiltration, or surface runoff.
(4) In the case of an installation with one primary tank, the
secondary containment shall be large enough to contain at least 100
percent of the volume of the primary tank.
(5) In the case of multiple primary tanks, the secondary
containment shall be large enough to contain 150 percent of the
volume of the largest primary tank placed in it, or 10 percent of the
aggregate internal volume of all primary tanks, whichever is
greater.
(d) The underground tank system shall be designed and constructed
with a continuous monitoring system capable of detecting the entry of
the liquid- or vapor-phase of the hazardous substance stored in the
primary containment into the secondary containment and capable of
detecting water intrusion into the secondary containment.
(e) The interstitial space of the underground storage tank shall
be maintained under constant vacuum or pressure such that a breach in
the primary or secondary containment is detected before the liquid
or vapor phase of the hazardous substance stored in the underground
storage tank is released into the environment. The use of
interstitial liquid level measurement methods satisfies the
requirements of this subdivision.
(f) The underground storage tank shall be provided with equipment
to prevent spills and overfills from the primary tank.
(g) If different substances are stored in the same tank and in
combination may cause a fire or explosion, or the production of
flammable, toxic, or poisonous gas, or the deterioration of a primary
or secondary container, those substances shall be separated in both
the primary and secondary containment so as to avoid potential
intermixing.
(h) Underground pressurized piping that conveys a hazardous
substance shall be equipped with an automatic line leak detector.
(i) Before the underground storage tank is covered, enclosed, or
placed in use, the standard installation testing requirements for
underground storage systems specified in Section 2.4 of the Flammable
and Combustible Liquids Code, adopted by the National Fire
Protection Association (NFPA 30), as amended and published in the
respective edition of the Uniform Fire Code, shall be followed.
(j) Before the underground storage tank is placed in use, the
underground storage tank shall be tested after installation using one
of the following methods to demonstrate that the tank is product
tight:
(1) Enhanced leak detection.
(2) An inert gas pressure test that has been certified by a third
party and approved by the board.
(3) A test method deemed equivalent to enhanced leak detection or
an inert gas pressure test by the board in regulations adopted
pursuant to this chapter. An underground storage tank installed and
tested in accordance with this subdivision is exempt from the
requirements of Section 25292.5.
(k) Notwithstanding Section 25281.5, for any system installed to
meet the requirements of this section, those portions of vent lines,
vapor recovery lines, and fill pipes that are beneath the surface of
the ground are "pipe" as the term is defined in subdivision (m) of
Section 25281, and therefore part of the underground storage tank
system.