Specifications include, but are not limited to: 2.1 Tank tightness and product piping test as required by the TCEQ, promulgated in the 30 Texas Administrative Code (TAC) Sec 334.50, consist of the following: 2.1.1 Piping tightness testing methods shall be capable of detecting a leak from any portion of the piping system. Piping tightness tests shall be conducted in accordance with a code or standard of practice developed by a nationally recognized association or independent testing laboratory. Any such tightness tests shall be capable of detecting any release from pressurized piping systems which equals or exceeds a rate of 0.1 gallons per hour when the piping pressure is at 150 percent of normal operating pressure. Testing for pressurized piping shall be conducted at least once per year and testing for suction and gravity flow piping shall be conducted at least once every three years. 2.1.2 Line leak detector testing, as required by the TCEQ, and promulgated in the 30 TAC Sec. 334.50 (b) (2) (A) (i) (111). Line leak detectors 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 procedures. 2.1.3 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. The tightness test shall be capable of detecting a release of 0.1 gallons per hour from any portion of the tank which contains regulated substances. The tank tightness test shall be performed in a manner to account for the effects of vapor pockets, thermal expansion or contraction of the stored substance, temperature of 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. All tanks shall be tested at least once during a maximum five-year contract period. 2.1.4 Piping and tank tightness testing shall be performed by qualified personnel who possess the requisite experience, training, competence to conduct tests properly, present at the facility to maintain responsible oversight throughout the entire testing procedure, and one who is certified by the manufacturer or developer of the testing equipment as being qualified to perform the tests. The tightness test shall be conducted in strict accordance with the testing procedures developed by the system manufacturer ordeveloper.