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Vaporless 99 LD-2000 Addendum 2.0 Background The federal Environmental Protection Agency (EPA) has provided a series of documents5 which describe the procedures which are to be used to verify that leak detection equipment meets the performance requirements of the Federal Register.6 At the minimum, a leak detector which is capable of detecting leaks of 3.0 gallons per hour (gal/hr) or larger on an hourly basis must be installed on all pressurized piping. Other options include the use of equipment which is capable of detecting 0.20 gal/hr on a monthly basis or an annual test capable of detecting leaks of 0.10 gal/hr. The probability of detecting a leak of stated size must be 95% or greater with a probability of a false alarm(declaring a tight line to be leaking) of no more than 5%. To provide a mechanism for achieving compliance with the requirements for leak detection on pressurized piping, the EPA has developed a test protocol "Standard Test Procedures for Evaluating Leak Detection Methods: Pressurized Pipeline Leak Detection Systems", EPA/530/JST-90/010, September, 1990. Testing conducted for this addendum were evaluated according to the EPA protocol with the exception of the number of tests conducted. The EPA protocol does not require that systems be tested on both rigid and flexible pipelines. However, some federal, state, and local regulators have required additional testing on flexible pipelines for systems that were originally evaluated on rigid pipelines. This addendum includes the results of testing conducted on flexible piping in response to those regulator's requirements. 5"Standard Test Procedures for Evaluating Leak Detection Methods," EPA/530 UST90/001-7, March to October 1990. Seven different procedures were developed for different leak detection methods and released between March and October 1990. 6 40CFR Part 280, Subpart D. Page 2