Oklahoma Administrative Code › Title 165 - Corporation Commission › Chapter 25 - Underground Storage Tanks › Subchapter 3 - Release Prevention and Detection Requirements › Part 2 - RELEASE DETECTION REQUIREMENTS AND METHODS › Section 165:25-3-6.25 - Interstitial monitoring

Current through Vol. 41, No. 20, July 1, 2024
(a) For
				  double-walled underground storage tank systems, the sampling or testing method
				  must be capable of detecting a leak at least every thirty (30 days) through the
				  inner wall in any portion of the tank that routinely contains product in
				  accordance with the manufacturer instructions.
(b) On new installations, the containment
				  sumps used for interstitial monitoring of piping must be tested at installation
				  using a PSTD approved testing method that tests the sump above the highest
				  penetration or sump sidewall seam. After initial testing, sumps must be tested
				  at least once every three (3) years for liquid tightness or use double-walled
				  containment sumps with periodic interstitial monitoring of the space between
				  the two (2) walls of the sump at least every thirty (30) days. Records
				  demonstrating compliance must be maintained for three (3) years.
(c) Existing systems must have the
				  containment sumps tested for liquid tightness by October 13, 2018, and at least
				  once every three (3) years thereafter or use double-walled containment sumps
				  with periodic interstitial monitoring of the space between the two (2) walls of
				  the sump at least every thirty (30) days. Owners and operators using a low
				  liquid level test must ensure that when the sensor is activated the alarm
				  activates, and verify the submersible pumps automatically shut off when the
				  liquid activates the sensors. Sensors must be mounted and positioned at the
				  lowest point in the sumps. Low liquid level UST sump testing must be performed
				  according to the procedures set forth on the Commission's Containment Sump
				  Alternative Test form. Records demonstrating compliance must be maintained for
				  three (3) years.
(d) Beginning
				  October 13, 2018, owners and operators must perform operation and maintenance
				  tests on electronic and mechanical components of release detection equipment.
				  This testing must be conducted according to the manufacturer's instructions or
				  a code of practice developed by a nationally recognized association or
				  independent testing laboratory. A test of the proper operation must be
				  performed at least annually and, at a minimum, as applicable to the facility,
				  cover the following components and criteria:
(1) Automatic tank gauge and other
				  controllers: test alarm, verify system configuration, test battery
				  backup.
(2) Probes and sensors:
				  inspect for residual buildup, ensure floats move freely, ensure shaft is not
				  damaged, ensure cables are free of kinks and breaks, test alarm operability and
				  communication with controller.
(3)
				  Vacuum pumps and pressure gauges: ensure proper communication with sensors and
				  controller.
(4) Hand-held
				  electronic sampling equipment associated with groundwater and vapor monitoring:
				  ensure proper operation.