New Mexico Administrative Code
Title 20 - ENVIRONMENTAL PROTECTION
Chapter 5 - PETROLEUM STORAGE TANKS
Part 108 - RELEASE DETECTION FOR UNDERGROUND STORAGE TANK SYSTEMS
Section 20.5.108.803 - MANUAL TANK GAUGING REQUIREMENTS FOR USTS
Universal Citation: 20 NM Admin Code 20.5.108.803
Current through Register Vol. 35, No. 6, March 26, 2024
A. Manual tank gauging:
(1) may be used as the sole method of release
detection for regulated underground tanks of 550 gallons or less nominal
capacity and tanks with a nominal capacity of 551 to 1,000 gallons that meet
the tank diameter of 48 inches or 64 inches for the life of these
tanks;
(2) may be used as a method
of release detection for regulated underground tanks with a nominal capacity of
551 to 1,000 gallons, with a diameter other than either 48 inches or 64 inches,
for 10 years after installation in conjunction with periodic tank tightness
testing in accordance with 20.5.108.802 NMAC and 20.5.108.804 NMAC;
(3) may be used as a method of release
detection for regulated underground tanks with a nominal capacity of 1,001 to
2,000 gallons with any diameter for 10 years after installation in conjunction
with periodic tank tightness testing in accordance with 20.5.108.802 NMAC and
20.5.108.804 NMAC;
(4) shall not be
used after the 10th year of the installation for
tanks described in Paragraphs (2) and (3) of this subsection; after the
10th year, owners and operators shall change to a
method described in 20.5.108.805 NMAC through 20.5.108.809 NMAC; and
(5) shall not be used to meet the
requirements of this part for tanks of greater than 2,000 gallons nominal
capacity.
B. Owners and operators of underground storage tanks who use manual tank gauging as release detection shall ensure the following:
(1)
tank liquid level measurements are taken at the beginning and ending of a
period of at least 36 hours during which no liquid is added to or removed from
the tank;
(2) level measurements
are based on an average of two consecutive stick readings at both the beginning
and ending of the period;
(3) the
equipment used is capable of measuring the level of product over the full range
of the tank's height to the nearest one-eighth of an inch;
(4) a suspected release is reported in
accordance with the requirements of 20.5.118 NMAC if the variation between
beginning and ending measurements exceeds any of the weekly or monthly
standards as follows:
(a) underground storage
tank with a nominal capacity of 550 gallons or less, with a minimum test
duration of 36 hours, where the weekly standard for one test exceeds 10
gallons, or the monthly standard for a four-test average exceeds five
gallons;
(b) underground storage
tank with a nominal capacity of 551 gallons through 1,000 gallons with a tank
diameter of 64 inches and a minimum test duration of 44 hours, where the weekly
standard for one test exceeds nine gallons or the monthly standard for a
four-test average exceeds four gallons;
(c) underground storage tank with a nominal
capacity of 551 gallons through 1,000 gallons with a tank diameter of 48 inches
and a minimum test duration of 58 hours, where the weekly standard for one test
exceeds 12 gallons or the monthly standard for a four-test average exceeds six
gallons;
(d) underground storage
tank with a nominal capacity of 551 gallons through 1,000 gallons, with a
minimum test duration of 36 hours, where the weekly standard for one test
exceeds 13 gallons or the monthly standard for a four-test average exceeds
seven gallons;
(e) underground
storage tank with a nominal capacity of 1,001 gallons through 2,000 gallons,
with a minimum test duration of 36 hours, where the weekly standard for one
test exceeds 26 gallons or the monthly standard for a four-test average exceeds
13 gallons.
C. At least annually, owners and operators shall check the operability and serviceability of any measuring device or equipment used for manual tank gauging in accordance with Subsection A of 20.5.108.800 NMAC.
D. Measurements and results of each monthly monitoring period shall be maintained in accordance with the recordkeeping requirements in 20.5.108.815 NMAC and shall be provided to the department upon request.
Disclaimer: These regulations may not be the most recent version. New Mexico may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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