40 CFR §264.1061

1. (a)An owner or operator subject to the requirements of § 264.1057 may elect to have all valves within a hazardous waste management unit comply with an alternative standard that allows no greater than 2 percent of the valves to leak.
2. (b)The following requirements shall be met if an owner or operator decides to comply with the alternative standard of allowing 2 percent of valves to leak:
   1. (1)A performance test as specified in paragraph (c) of this section shall be conducted initially upon designation, annually, and at other times requested by the Regional Administrator.
   2. (2)If a valve leak is detected, it shall be repaired in accordance with § 264.1057(d) and (e).
3. (c)Performance tests shall be conducted in the following manner:
   1. (1)All valves subject to the requirements in § 264.1057 within the hazardous waste management unit shall be monitored within 1 week by the methods specified in § 264.1063(b).
   2. (2)If an instrument reading of 10,000 ppm or greater is measured, a leak is detected.
   3. (3)The leak percentage shall be determined by dividing the number of valves subject to the requirements in § 264.1057 for which leaks are detected by the total number of valves subject to the requirements in § 264.1057 within the hazardous waste management unit.