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' ! I44 Date: December 17,2007 Praxair Services,Inc.QA Revised by: Randy Golding Tracer Tigh* Approved by: Randy Golding Version 6 Work Plan /j�/Site Owner Name Cf- M-�020ej WAOic S Address 2ST. f,. e City and State In Service Enhanced Leak Detection Protocol (IS-EL ) (The IS-ELD Method Utilizes an Onsite Site Laboratory for Real-Time Results) Introduction In Service Enhanced Leak Detection(IS-ELD)means a test method which is approved by the California Water Resources Control Board that ascertains the physical integrity of an underground tank system by introduction,and external detection, of a substance that is not a component of the fuel formulation that is stored in the tank system while the system is in service. The test method is third party certified for the capability of detecting both vapor and Iiquid phase releases from the underground storage tank system. The Enhanced Leak Detection test method is capable of detecting a leak rate of at least 0.005 gph or less,with a probability of detection of at least 95%and a probability of false alarm no greater than 5%. Concept Tracer Tights is a unique method of testing underground storage systems for tightness. A unique chemical called a tracer is added to the product stored in the tank. The tracer is an inert chemical that evaporates readily from the fuel. After tracer is added to the system,it is distributed between the vapor and liquid inside the tank. Use of the system carries the tracer throughout the piping. If any small leak exists in the system,the tracer is allowed to escape from the system,either as a vapor or as a dissolved component of the liquid. Once outside the system, the dissolved tracer evaporates from the liquid and the tracer vapors begin to migrate away from the location of the leak in all directions. After an appropriate waiting period, the tracer vapors are detectable at least ten feet or more away from the leak in all directions. Samples of air collected from the soil within the radius of detection of the tracer reveal the leak as a presence of the tracer chemical. Because the tracer chemical is not normally found in the environment or in fuel products,the Tracer Tight®method is able to discriminate between previous contamination and current leakage. Contractor It is important that before Praxalr arrives on site that the tanks receive enough fuel to avoid deliveries until the test is completed. If a fuel drop becomes necessary in order to keep the station open then contact Praxair°s site project manager and schedule the drop while the crew is onsite. A clean fuel drop reduces the possibility of having to retest the site. A contractor capable of repairing any exposed component in the system including having spare parts must be onsite to expedite repairs. The contractor skills must include the ability to operate and make adjustments to the settings of the electronics controlling the fueling system. The contractor must be capable and committed to working longer hours and extended days outside of normal work week. The owner's contractor will be in complete control of the fueling system and it is the contractor's responsibility to operate the fueling system properly and to reassemble the system back into a pretest configuration. Praxair Service,Inc.is only responsible for testing the fueling system and is not responsible for its operation. TNISINFORMATIONISTUB PROPERTY OFPRrI UM SERI?CES,INC.. I of 3