1. (a) General requirements.

   1. (1) Owners and operators of new and existing underground storage tank (UST) systems shall provide a method, or combination of methods, of release detection which shall be:

      1. (A) capable of detecting a release from any portion of the underground storage tank system which contains regulated substances including the tanks, piping, and other ancillary equipment;
      2. (B) installed, calibrated, operated, and maintained in accordance with the manufacturer's specifications and instructions, and by personnel possessing the necessary experience, training, and competence to accomplish such requirements; and

      3. (C) capable of meeting the particular performance requirements of such method (or methods) as specifically prescribed in this section, based on the performance claims by the equipment manufacturer or installer, provided that the following additional requirements shall also be met.

         1. (i) Any performance claims, together with their bases or methods of determination, shall be obtained from the equipment manufacturer or installer and shall be in writing.

         2. (ii) When any of the following release detection methods are used on or after December 22, 1990, (except for methods permanently installed and in operation prior to that date), such method shall be capable of detecting the particular release rate or quantity specified for that method such that the probability of detection shall be at least 95% and the probability of false alarm shall be no greater than 5.0%:

            1. (I) tank tightness testing, as prescribed in subsection (d)(1)(A) of this section;
            2. (II) automatic tank gauging, as prescribed in subsection (d)(4) of this section;
            3. (III) automatic line leak detectors for piping, as prescribed in subsection (b)(2)(A)(i) of this section; and
            4. (IV) piping tightness testing, as prescribed in subsection (b)(2)(A)(ii)(I) of this section.
   2. (2) When a release detection method operated in accordance with the particular performance standards for that method indicates that a release either has or may have occurred, the owners and operators shall comply with the applicable release reporting, investigation, and corrective action requirements in Subchapter D of this chapter (relating to Release Reporting and Corrective Action).
   3. (3) Owners and operators of all UST systems shall comply with the release detection requirements of this section in accordance with the applicable schedules in §334.44 of this title (relating to Implementation Schedules).
   4. (4) As prescribed in §334.47(a)(2) of this title (relating to Technical Standards for Existing UST Systems), any existing UST system that cannot be equipped or monitored with a method of release detection that meets the requirements of this section shall be permanently removed from service in accordance with the applicable procedures in §334.55 of this title (relating to Permanent Removal from Service) no later than 60 days after the implementation date for release detection as prescribed by the applicable schedules in §334.44 of this title (relating to Implementation Schedules).
   5. (5) Any owner or operator who plans to install a release detection method for a UST system shall comply with the applicable construction notification requirements in §334.6 of this title (relating to Construction Notification), and upon completion of the installation of such method shall also comply with the applicable registration and certification requirements of §334.7 of this title (relating to Registration) and §334.8 of this title (relating to Certification).
   6. (6) Any equipment installed or used for conducting release detection for a UST system shall be listed, approved, designed, and operated in accordance with standards developed by a nationally recognized association or independent testing laboratory (e.g., UL) for such installation or use.

2. (b) Release detection requirements for all UST systems. Owners and operators of all UST systems shall ensure that release detection equipment or procedures are provided in accordance with the following requirements.

   1. (1) Release detection requirements for tanks.

      1. (A) Except as provided in subparagraphs (B) and (C) of this paragraph, all tanks shall be monitored for releases at a frequency of at least once every month (not to exceed 35 days between each monitoring) by using one or more of the release detection methods described in subsection (d)(4)-(9) of this section.

      2. (B) A combination of tank tightness testing and inventory control in accordance with subsection (d)(1) of this section may be used as an acceptable release detection method for tanks only until December 22, 1998, and the required frequency of the tank tightness test shall be based on the following criteria.

         1. (i) A tank tightness test shall be conducted at least once each year for any tank in an existing UST system which is not being operated in violation of the upgrading or replacement schedule in §334.44(b) of this title (relating to Implementation Schedules), but has not yet been either:

            1. (I) replaced with a UST system meeting the applicable technical and installation standards in §334.45 of this title (relating to Technical Standards for New UST Systems) and §334.46 of this title (relating to Installation Standards for New UST Systems); or
            2. (II) retrofitted or equipped in accordance with the minimum upgrading requirements applicable to existing UST systems in §334.47 of this title (relating to Technical Standards for Existing UST Systems).

         2. (ii) A tank tightness test shall be conducted at least once every five years for any tank in a UST system which has been either:

            1. (I) installed in accordance with the applicable technical standards for new UST systems in §334.45 of this title (relating to Technical Standards for New UST Systems) and §334.46 of this title (relating to Installation Standards for New UST Systems); or
            2. (II) retrofitted or equipped in accordance with the minimum upgrading requirements applicable to existing UST systems in §334.47 of this title (relating to Technical Standards for Existing UST Systems).
      3. (C) The manual tank gauging method of release detection, as prescribed in subsection (d)(2) of this section, may be used as the sole release detection system only for a petroleum substance tank with a nominal capacity of 550 gallons or less. The monthly tank gauging method of release detection, as prescribed in subsection (d)(3) of this section, may be used as the sole release detection system only for emergency generator tanks.
      4. (D) In addition to the requirements in subparagraphs (A)-(C) of this paragraph, any tank in a hazardous substance UST system shall also be equipped with a secondary containment system and related release detection equipment, as prescribed in subsection (c) of this section.

   2. (2) Release detection for piping. Piping in an underground storage tank system shall be monitored in a manner designed to detect a release from any portion of the piping system, and in accordance with the following requirements.

      1. (A) Requirements for pressurized piping. Underground storage tank system piping that conveys regulated substances under pressure shall be in compliance with the following requirements.

         1. (i) Each separate pressurized line shall be equipped with an automatic line leak detector meeting the following requirements.

            1. (I) The line leak detector shall be capable of detecting any release from the piping system which equals or exceeds three gallons per hour when the piping pressure is at 10 pounds per square inch.
            2. (II) The line leak detector shall be capable of alerting the UST system operator of any release within one hour of occurrence either by shutting off the flow of regulated substances, by substantially restricting the flow of regulated substances, or by emitting or triggering audible and visible alarms.
            3. (III) The line leak detector shall be tested at least once per year for performance and operational reliability and shall be properly calibrated and maintained, in accordance with the manufacturer's specifications and recommended procedures.

         2. (ii) In addition to the required line leak detector prescribed in clause (i) of this subparagraph, each pressurized line shall also be tested or monitored for releases in accordance with at least one of the following methods.

            1. (I) The piping may be tested at least once per year by means of a piping tightness test conducted in accordance with a code or standard of practice developed by a nationally recognized association or independent testing laboratory. Any such piping tightness test shall be capable of detecting any release from the piping system which equals or exceeds a rate of 0.1 gallons per hour when the piping pressure is at 150% of normal operating pressure.
            2. (II) The piping may be monitored for releases at least once every month (not to exceed 35 days between each monitoring) by using one or more of the release detection methods prescribed in subsection (d)(5)-(9) of this section.

      2. (B) Requirements for suction piping and gravity flow piping.

         1. (i) Except as provided in clause (ii) of this subparagraph, each separate line in a UST piping system that conveys regulated substances either under suction or by gravity flow shall meet at least one of the following requirements.

            1. (I) Each separate line may be tested at least once every three years by means of a piping tightness test conducted in accordance with a code or standard of practice developed by a nationally recognized association or independent testing laboratory. Any such piping test shall be capable of detecting any release from the piping system which equals or exceeds a rate of 0.1 gallon per hour when the piping pressure is at 150% of normal operating pressure.
            2. (II) Each line may be monitored for releases at least once every month (not to exceed 35 days between each monitoring) by using one or more of the release detection methods prescribed in subsection (d)(5)-(9) of this section.

         2. (ii) No release detection methods are required to be installed or applied for any piping system that conveys regulated substances under suction when such suction piping system is designed and constructed in accordance with the following standards.

            1. (I) The below-grade piping operates at less than atmospheric pressure.
            2. (II) The below-grade piping is sloped so that the contents of the pipe will drain back into the storage tank if the suction is released.
            3. (III) Only one check valve is included in each suction line.
            4. (IV) The check valve is located directly below and as close as practical to the suction pump.
            5. (V) A method is incorporated into the system design that will allow verification that the requirements under subclauses (I)-(IV) of this clause have been met.
      3. (C) Monitoring secondary containment. In addition to the requirements in subparagraphs (A) and (B) of this paragraph, all piping in a hazardous substance UST system shall also be equipped with a secondary containment system and related release detection equipment, as prescribed in subsection (c) of this section.

3. (c) Additional release detection requirements for hazardous substance UST systems. In addition to the release detection requirements for all UST systems prescribed in subsections (a) and (b) of this section, owners and operators of all hazardous substance UST systems shall also assure compliance with the following additional requirements.

   1. (1) All new hazardous substance UST systems shall be in compliance with the requirements of paragraph (3) of this subsection for the entire operational life of the system.
   2. (2) All existing hazardous substance UST systems shall be brought into compliance with the requirements of paragraph (3) of this subsection no later than December 22, 1998.

   3. (3) Secondary containment and monitoring.

      1. (A) All hazardous substance UST systems (including tanks and piping) shall be equipped with a secondary containment system which shall be designed, constructed, installed, and maintained in accordance with §334.45(d) of this title (relating to Technical Standards for New UST Systems) and §334.46(f) of this title (relating to Installation Standards for New UST Systems).
      2. (B) All hazardous substance UST systems (including tanks and piping) shall include one or more of the release detection methods or equipment prescribed in subsection (d)(7)-(9) of this section, which shall be capable of monitoring the space between the primary tank and piping walls and the secondary containment wall or barrier.

4. (d) Allowable methods of release detection. Tanks in a UST system may be monitored for releases using one or more of the methods included in paragraphs (1)-(9) of this subsection. Piping in a UST system may be monitored for releases using one or more of the methods included in paragraphs (5)-(9) of this subsection. Any method of release detection for tanks and/or piping in this section shall be allowable only when installed (or applied), operated, calibrated, and maintained in accordance with the particular requirements specified for such method in this subsection.

   1. (1) Tank tightness testing and inventory control. A combination of tank tightness testing and inventory control may be used as a tank release detection method only until December 22, 1998, subject to the following conditions and requirements.

      1. (A) Tank tightness test. Any tank tightness test shall be conducted in conformance with the following standards.

         1. (i) The tank tightness test shall be conducted in accordance with a code or standard of practice developed by a nationally recognized association or independent testing laboratory.
         2. (ii) The tank tightness test shall be performed by qualified personnel who possess the requisite experience, training, and competence to conduct the test properly, who are present at the facility and who maintain responsible oversight throughout the entire testing procedure, and who have been certified by the manufacturer or developer of the testing equipment as being qualified to perform the test. The tank tightness test shall be conducted in strict accordance with the testing procedures developed by the system manufacturer or developer.
         3. (iii) The tank tightness test shall be capable of detecting a release which equals or exceeds a rate of 0.1 gallon per hour from any portion of the tank which contains regulated substances.
         4. (iv) The tank tightness test shall be performed in a manner that will account for the effects of vapor pockets, thermal expansion or contraction of the stored substance, temperature of the stored substance, temperature stratification, evaporation or condensation, groundwater elevation, pressure variations within the system, tank end deflection, tank deformation, and any other factors that could affect the accuracy of the test procedures.

      2. (B) Inventory control. All inventory control procedures shall be in conformance with the following requirements.

         1. (i) All inventory control procedures shall be in accordance with a code or standard of practice developed by a nationally recognized association or independent testing laboratory.
         2. (ii) Reconciliation of detailed inventory control records shall be conducted at least once each month, and shall be sufficiently accurate to detect a release which equals or exceeds the sum of 1.0% of the total substance flow-through for the month plus 130 gallons.

         3. (iii) The operator shall assure that the following additional procedures and requirements are followed.

            1. (I) Inventory volume measurement for regulated substance inputs, withdrawals, and the amount still remaining in the tank shall be recorded each operating day.
            2. (II) The equipment used shall be capable of measuring the level of stored substance over the full range of the tank's height to the nearest one-eighth of an inch.
            3. (III) Substance dispensing shall be metered and recorded within the local standards for meter calibration or within an accuracy of six cubic inches for every five gallons of product withdrawn.
            4. (IV) The measurement of any water level in the bottom of the tank shall be made to the nearest one-eighth of an inch at least once a month, and appropriate adjustments to the inventory records shall be made.
         4. (iv) For tanks with a nominal capacity of 2,000 gallons or less, the owner or operator may use the manual tank gauging method (in accordance with paragraph (2) of this subsection) as a substitute for the inventory control procedures prescribed in this subsection.

   2. (2) Manual tank gauging. Manual tank gauging may be used as a tank release detection method, subject to the following limitations and requirements.

      1. (A) Manual tank gauging in accordance with this subparagraph may be used as the sole method of tank release detection only for petroleum substance tanks having a nominal capacity of 550 gallons or less.
      2. (B) When used in conjunction with tank tightness testing performed in accordance with paragraph (1)(A) of this subsection, manual tank gauging may be used in lieu of the normal inventory control procedures in paragraph (1)(B) of this subsection as a tank release detection method for any tanks having a nominal capacity of 2,000 gallons or less.
      3. (C) The use of manual tank gauging shall not be considered an acceptable method for meeting the release detection requirements of this section for any tanks with a nominal capacity greater than 2,000 gallons.

      4. (D) When used for compliance with the release detection requirements of this section, the procedures and requirements in the following clauses shall be applicable.

         1. (i) For purposes of this subparagraph only, the following definitions are applicable.

            1. (I) Level measurement--The average of two consecutive liquid level readings from a tank gauge, measuring stick, or other measuring equipment.
            2. (II) Gauging period--A weekly period of at least 36 hours during which no substance is added to or removed from the tank.
            3. (III) Weekly deviation--The variation between the level measurements taken at the beginning and the end of one gauging period, converted to and expressed as gallons.
            4. (IV) Monthly deviation--The arithmetic average of four consecutive weekly deviations, expressed as gallons.
         2. (ii) Any measuring equipment shall be capable of measuring the level of stored substance over the full range of the tank's height to the nearest one-eighth of an inch.
         3. (iii) Separate liquid level measurements in the tank shall be taken weekly at the beginning and the ending of the gauging period, and the weekly deviation shall be determined from such level measurements.
         4. (iv) Once each month, after four consecutive weekly deviations are determined, a monthly deviation shall be calculated.

         5. (v) For the purposes of the manual tank gauging method of release detection, a release shall be indicated when either the weekly deviation or the monthly deviation exceeds the maximum allowable standards indicated in the following subclauses:

            1. (I) for a tank with a capacity of 550 gallons or less: weekly standard = 10 gallons; monthly standard = five gallons;
            2. (II) for a tank with a capacity of 551 gallons to 1,000 gallons: weekly standard = 13 gallons; monthly standard = seven gallons; and
            3. (III) for a tank with a capacity of 1,001 gallons to 2,000 gallons: weekly standard = 26 gallons; monthly standard = 13 gallons.
         6. (vi) When either the weekly standard or the monthly standard is exceeded and a suspected release is thereby indicated, the owner or operator shall comply with the applicable release reporting, investigation, and corrective action requirements of Subchapter D of this chapter (relating to Release Reporting and Corrective Action).

   3. (3) Monthly tank gauging. Monthly tank gauging may be used as a tank release detection method, subject to the following limitations and requirements.

      1. (A) Monthly tank gauging in accordance with this paragraph may be used as the sole method of tank release detection only for emergency generator tanks.
      2. (B) The use of monthly tank gauging shall not be considered an acceptable method for meeting the release detection requirements of this section for any tanks other than emergency generator tanks.

      3. (C) When used for compliance with the release detection requirements of this section, the procedures and requirements in the following clauses shall be applicable.

         1. (i) For purposes of this paragraph only, the following definitions are applicable.

            1. (I) Level measurement--The average of two consecutive liquid level readings from a tank gauge, measuring stick, or other manual or automatic measuring equipment.
            2. (II) Gauging period--A period of at least 36 hours during which no substance is added to or removed from the tank.
            3. (III) Monthly deviation--The variation between the level measurements taken at the beginning and the end of one gauging period, converted to and expressed as gallons.
         2. (ii) Any measuring equipment (whether operated manually or automatically) shall be capable of measuring the level of a stored substance over the full range of the tank's height to the nearest one-eighth of an inch.
         3. (iii) Separate liquid level measurements in the tank shall be taken at least once monthly at the beginning and the ending of the gauging period, and the monthly deviation shall be determined from such level measurements.

         4. (iv) For the purposes of the monthly tank gauging method of release detection, a release shall be indicated when the monthly deviation exceeds the maximum allowable standards indicated in the following subclauses:

            1. (I) for a tank with a capacity of 550 gallons or less: monthly standard = five gallons;
            2. (II) for a tank with a capacity of 551 gallons to 1,000 gallons: monthly standard = seven gallons;
            3. (III) for a tank with a capacity of 1,001 gallons to 2,000 gallons: monthly standard = 13 gallons;
            4. (IV) for a tank with a capacity greater than 2,000 gallons: monthly standard = 1.0% of the total tank capacity.
         5. (v) When the monthly standard is exceeded and a suspected release is thereby indicated, the owner or operator shall comply with the applicable release reporting, investigation, and corrective action requirements of Subchapter D of this chapter (relating to Release Reporting and Corrective Action).

   4. (4) Automatic tank gauging and inventory control.

      1. (A) A combination of automatic tank gauging and inventory control may be used as a tank release detection method, subject to the following requirements.

         1. (i) Inventory control procedures shall be in compliance with paragraph (1)(B) of this subsection.

         2. (ii) The automatic tank gauging equipment shall be capable of:

            1. (I) automatically monitoring the in-tank liquid levels, conducting automatic tests for substance loss, and collecting data for inventory control purposes; and
            2. (II) performing an automatic test for substance loss that can detect a release which equals or exceeds a rate of 0.2 gallon per hour from any portion of the tank which contains regulated substances.

      2. (B) For emergency generator tanks only, automatic tank gauging may be used as a tank release detection method, provided that the automatic tank gauging equipment shall be capable of:

         1. (i) automatically monitoring the in-tank liquid levels;
         2. (ii) conducting continuous automatic tests for substance loss during the periods when the emergency generator engine is not in operation; and
         3. (iii) performing an automatic test for substance loss that can detect a release which equals or exceeds a rate of 0.2 gallon per hour from any portion of the tank which contains regulated substances.

   5. (5) Vapor monitoring. Equipment and procedures designed to test or monitor for the presence of vapors from the regulated substance (or from a related tracer substance) in the soil gas of the backfilled excavation zone may be used, subject to the following limitations and requirements.

      1. (A) The bedding and backfill materials in the excavation zone shall be sufficiently porous to allow vapors from any released regulated substance (or related tracer substance) to rapidly diffuse through the excavation zone (e.g., gravel, sand, crushed rock).
      2. (B) The stored regulated substance, or any tracer substance placed in the tank system, shall be sufficiently volatile so that, in the event of a substance release from the UST system, vapors will develop to a level that can be readily detected by the monitoring devices located in the excavation zone.
      3. (C) The capability of the monitoring device to detect vapors from the stored regulated substance shall not be adversely affected by the presence of any groundwater, rainfall, and/or soil moisture in a manner that would allow a release to remain undetected for more than one month (not to exceed 35 days).
      4. (D) Any preexisting background contamination in the excavation zone shall not interfere with the capability of the vapor monitoring equipment to detect releases from the UST system.
      5. (E) The vapor monitoring equipment shall be designed to detect vapors from either the stored regulated substance, a component or components of the stored substance, or a tracer substance placed in the UST system, and shall be capable of detecting any significant increase in vapor concentration above preexisting background levels.

      6. (F) Prior to installation of any vapor monitoring equipment, the site of the UST system (within the excavation zone) shall be assessed by qualified personnel to:

         1. (i) ensure that the requirements in subparagraphs (A)-(D) of this paragraph have been met; and
         2. (ii) determine the appropriate number and positioning of any monitor wells and/or observation wells, so that releases into the excavation zone from any part of the UST system can be detected within one month of the release (not to exceed 35 days).
      7. (G) All monitoring wells and observation wells shall be designed and installed in accordance with the requirements of §334.46(g) of this title (relating to Installation Standards for New UST Systems).

   6. (6) Groundwater monitoring. Equipment or procedures designed to test or monitor for the presence of regulated substances floating on or dissolved in the groundwater in the excavation zone may be used, subject to the following limitations and requirements.

      1. (A) The stored regulated substance shall be immiscible in water and shall have a specific gravity of less than one.
      2. (B) The natural groundwater level shall never be more than 20 feet (vertically) from the ground surface, and the hydraulic conductivity of the soils or backfill between all parts of the UST system and the monitoring points shall not be less than 0.01 centimeters per second (i.e., the soils or backfill shall consist of gravels, coarse to medium sands, or other similarly permeable material).
      3. (C) Any automatic monitoring devices that are employed shall be capable of detecting the presence of at least 1/8 inch of free product on top of the groundwater in the monitoring well or observation well. Any manual monitoring method shall be capable of detecting a visible sheen or other accumulation of regulated substances in or on the groundwater in the monitoring well or observation well.

      4. (D) Prior to installation of any groundwater monitoring equipment, the site of the UST system (within and immediately below the excavation zone) shall be assessed by qualified personnel to:

         1. (i) ensure compliance with the requirements of subparagraphs (A) and (B) of this paragraph; and
         2. (ii) determine the appropriate number and positioning of any monitoring wells and/or observation wells, so that releases from any part of the UST system can be detected within one month (not to exceed 35 days) of the release.
      5. (E) All monitoring wells and observation wells shall be designed, installed, and maintained in accordance with the requirements in §334.46(g) of this title (relating to Installation Standards for New UST Systems).

   7. (7) Interstitial monitoring for double-wall UST systems. Equipment designed to test or monitor for the presence of regulated substance vapors or liquids in the interstitial space between the inner (primary) and outer (secondary) walls of a double-wall underground storage tank system may be used, subject to the following conditions and requirements.

      1. (A) Any double-wall UST system using this method of release detection shall be designed, constructed, and installed in accordance with the applicable technical and installation requirements in §334.45(d) of this title (relating to Technical Standards for New UST Systems) and §334.46(f) of this title (relating to Installation Standards for New UST Systems).
      2. (B) The sampling, testing, or monitoring method shall be capable of detecting any release of stored regulated substances from any portion of the primary tank or piping within one month (not to exceed 35 days) of the release.
      3. (C) The sampling, testing, or monitoring method shall be capable of detecting a breach or failure in the primary wall and the entrance of groundwater into the interstitial space due to a breach in the secondary wall of the double-wall tank or piping system within one month (not to exceed 35 days) of such breach or failure (whether or not a stored regulated substance has been released into the environment).

   8. (8) Monitoring of UST systems with secondary containment barriers. Equipment designed to test or monitor for the presence of regulated substances (liquids or vapors) in the excavation zone between the UST system and an impermeable secondary containment barrier immediately around the UST system may be used, subject to the following conditions and requirements.

      1. (A) Any secondary containment barrier or liner system at a UST system using this method of release detection shall be designed, constructed, and installed in accordance with the applicable technical and installation requirements in §334.45(d) of this title (relating to Technical Standards for New UST Systems) and §334.46(f) of this title (relating to Installation Standards for New UST Systems).
      2. (B) The sampling, testing, or monitoring method shall be capable of detecting any release of stored regulated substance from any portion of the UST system into the excavation zone between the UST system and the secondary containment barrier within one month (not to exceed 35 days) of the release.
      3. (C) The sampling, testing, or monitoring method shall be designed and installed in a manner that will ensure that groundwater, soil moisture, and rainfall will not render the method inoperative where a release could remain undetected for more than one month (not to exceed 35 days).

      4. (D) Prior to installation of any secondary containment release monitoring equipment, the site of the UST system shall be assessed by qualified personnel to:

         1. (i) ensure that the secondary containment barrier will be positioned above the groundwater level and outside the designated 25-year flood plain, unless the barrier and the monitoring equipment are designed for use under such conditions; and
         2. (ii) determine the appropriate number and positioning of any observation wells.
      5. (E) All observation wells shall be designed and installed in accordance with the requirements in §334.46(g) of this title (relating to Installation Standards for New UST Systems).
   9. (9) Alternative release detection method. Any other release detection method, or combination of methods, may be used if such method has been reviewed and determined by the executive director to be capable of detecting a release from any portion of the UST system in a manner that is no less protective of human health and safety and the environment than the methods described in paragraphs (1)-(8) of this subsection, in accordance with the provisions of §334.43 of this title (relating to Variances and Alternative Procedures).

5. (e) Release detection records.

   1. (1) Owners and operators shall maintain the release detection records required in this subsection in accordance with the requirements in §334.10(b) of this title (relating to Reporting and Recordkeeping).

   2. (2) Owners and operators shall maintain records adequate to demonstrate compliance with the release detection requirements in this section, and in accordance with the following minimum requirements.

      1. (A) All appropriate installation records related to the release detection system, as listed in §334.46(i) of this title (relating to Installation Standards for New UST Systems), shall be maintained for as long as the release detection system is used.
      2. (B) All written performance claims pertaining to any release detection system used, and documentation of the manner in which such claims have been justified or tested by the equipment manufacturer or installer, shall be maintained for as long as the release detection system is used.
      3. (C) Records of the results of all manual and/or automatic methods of sampling, testing, or monitoring for releases (including tank tightness tests) shall be maintained for at least five years after the sampling, testing, or monitoring is conducted.
      4. (D) Records and calculations related to inventory control reconciliation shall be maintained for at least five years from the date of reconciliation.
      5. (E) Written documentation of all service, calibration, maintenance, and repair of release detection equipment permanently located on-site shall be maintained for at least five years after the work is completed. Any schedules of required calibration and maintenance provided by the release detection equipment manufacturer shall be retained for as long as the release detection system is used.

Source Note:The provisions of this §334.50 adopted to be effective September 29, 1989, 14 TexReg 4714; amended to be effective June 25, 1990, 15 TexReg 3424.