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Date: REV.December 17,2007 Praxair Services,Inc.QA <br /> Revised by: Randy Golding Tracer Tight© <br /> Approved by: Randy Golding Version 6 <br /> Work Plan <br /> Site Owner <br /> Name Tracy BP Services ABC;Petroleum <br /> Address 2375 Trary Blyd 6951 S. Front RD. <br /> City and State Trac} CA T ivermore,CA <br /> In Service Enhanced Leak DetectionProtocol (I - L ) <br /> (The IS-ELD Method Utilizes an Onsite Site Laboratory for Real-Time Results) <br /> Introduction <br /> In Service Enhanced Leak Detection(IS-ELD)means a test method which is approved by the California Water Resources <br /> Control Board that ascertains the physical integrity of an underground tank system by introduction,and external detection, <br /> of a substance that is not a component of the fuel formulation that is stored in the tank system while the system is in <br /> service. The test method is third party certified for the capability of detecting both vapor and liquid phase releases from <br /> the underground storage tank system. The Enhanced Leak Detection test method is capable of detecting a leak rate of at <br /> 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%. <br /> Concept <br /> Tracer Tights is a unique method of testing underground storage systems for tightness. A unique chemical called a tracer <br /> is added to the product stored in the tank. The tracer is an inert chemical that evaporates readily from the fuel. After <br /> tracer is added to the system, it is distributed between the vapor and liquid inside the tank. Use of the system carries the <br /> tracer throughout the piping. If any small leak exists in the system,the tracer is allowed to escape from the system, either <br /> as a vapor or as a dissolved component of the liquid. Once outside the system, the dissolved tracer evaporates from the <br /> liquid and the tracer vapors begin to migrate away from the location of the leak in all directions. After an appropriate <br /> waiting period, the tracer vapors are detectable at least ten feet or more away from the leak in all directions. Samples of <br /> air collected from the soil within the radius of detection of the tracer reveal the leak as a presence of the tracer chemical. <br /> Because the tracer chemical is not normally found in the environment or in fuel products,the Tracer Tight®method is able <br /> to discriminate between previous contamination and current leakage. <br /> Contractor <br /> It is important that before Praxair arrives on site that the tanks receive enough fuel to avoid deliveries until the <br /> test is completed. If a fuel drop becomes necessary in order to keep the station open then contact Praxair's site <br /> project manager and schedule the drop while the crew is onsite. A clean fuel drop reduces the possibility of having <br /> to retest the site. <br /> A contractor capable of repairing any exposed component in the system including having spare parts must be <br /> onsite to expedite repairs. The contractor skills must include the ability to operate and make adjustments to the <br /> settings of the electronics controlling the fueling system. The contractor must be capable and committed to <br /> working longer hours and extended days outside of normal work week. The owner's contractor will be in complete <br /> control of the fueling system and it is the contractor's responsibility to operate the fueling system properly and to <br /> reassemble the system back into a pretest configuration. Praxair Service,Inc.is only responsible for testing the <br /> fueling system and is not responsible for its operation. <br /> THIS INFORMATION IS THE PROPERTY OF PRAXAIR SERVICES,INC.. <br /> 1 of 3 <br />