New Mexico Administrative Code
Title 20 - ENVIRONMENTAL PROTECTION
Chapter 5 - PETROLEUM STORAGE TANKS
Part 108 - RELEASE DETECTION FOR UNDERGROUND STORAGE TANK SYSTEMS
Section 20.5.108.802 - INVENTORY CONTROL WITH TANK TIGHTNESS TESTING REQUIREMENTS FOR USTS
Current through Register Vol. 35, No. 6, March 26, 2024
Owners and operators of underground storage tanks installed on or before April 4, 2008 may use inventory control in conjunction with tank tightness testing every five years as release detection for 10 years after the storage tank system is installed. After the 10-year anniversary of the storage tank system installation, owners and operators shall use one of the methods in 20.5.108.805 NMAC through 20.5.108.809 NMAC. Inventory control with tank tightness testing shall meet the following requirements:
A. Inventory control or another test of equivalent performance shall be conducted monthly to detect a release of at least one percent of flow-through plus 130 gallons on a monthly basis.
B. Inventory volume measurements for regulated substance inputs, withdrawals, and the amount still remaining in the UST are recorded each operating day.
C. The equipment used is capable of measuring the level of regulated substance over the full range of the UST's height to the nearest one-eighth of an inch.
D. The regulated substance inputs are reconciled with delivery receipts by measurement of the UST inventory volume before and after delivery.
E. Deliveries are made through a drop tube that extends to within one foot of the UST bottom.
F. Regulated substance dispensing is metered and recorded within the state standards for meter calibration or an accuracy of six cubic inches for every five gallons of regulated substance withdrawn.
G. The measurement of any water level in the bottom of the UST is made to the nearest one-eighth of an inch at least once a month.
H. Practices described in the American Petroleum Institute Publication RP 1621, "Bulk Liquid Stock Control at Retail Outlets" may be used, where applicable, as guidance in meeting the requirements of 20.5.108.802 NMAC.
I. Owners and operators shall meet all the requirements for tank tightness testing in 20.5.108.804 NMAC.
J. At least annually, owners and operators shall check the operability and serviceability of any measuring device or equipment used for inventory control in accordance with Subsection A of 20.5.108.800 NMAC.
K. 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.
