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Date: December 17,2007 Praxair Services,Inc.QA <br /> Revised by: Randy Golding Tracer Tight® <br /> Approved by: Randy Golding Version 6 <br /> Description <br /> The process is described in the following steps: <br /> • Preparation <br /> • Probe Array Installation <br /> • Confirmation Test <br /> • Inoculation <br /> • Leak Simulation <br /> • Sample Collection <br /> • Analysis <br /> • Spill Bucket Test <br /> • Reporting <br /> Preparation <br /> All necessary permits must be acquired and appropriate notices to local regulators must be given prior to arrival at the site. <br /> Upon arrival, the crew reviews the tank information that has been made available and uses this information to plan the <br /> installation of the sampling probe array. If"as built" plans or site plans have not been made available, the crew inspects <br /> all accessible portions of the system to learn as much as possible about the location of all UST system components. If the <br /> site is under remediation, soil vapor extraction systems, air-sparging systems and bio-venting systems must be turned off <br /> during the test. Groundwater measurements are to be taken within the tank excavation zone. <br /> Probe Array Installation <br /> The following ELD probe installation was approved by the Water Resources Control Board. Vertical PVC sampling <br /> probes are installed within eight horizontal feet of all possible leak locations (a maximum of 15 feet apart). In situations <br /> where tank pits and piping trenches do not contain engineered backfill (sand or pea-gravel), the sampling probes are <br /> installed with a maximum 10-foot spacing. Tank probes are installed along the side of each tank, generally at a depth <br /> centered on the tanks. Maximum probe depth is 15 feet(or just above the water table if applicable).Additional probes are <br /> installed near any appurtenances along the tank ridge where a containment sump is not present. Piping probes are placed <br /> along the product distribution,vapor recovery and vent piping trenches,to one half the depth of the piping or until the end <br /> of the probe is within engineered backfill. Probes are generally installed at a depth of 1 to 1.5 feet below grade. Probes are <br /> installed by coring a hole in the pavement and inserting a sampling probe into the excavation zone of the tank or pipe.The <br /> top of each probe is fitted with a PVC sampling cap that will allow access for the collection of samples. <br /> Confirmation Test <br /> Confirmation Test (Pre-certification tightness test) is completed before the system is inoculated. The test is used to <br /> confirm the tightness of all the accessible fittings. This is done to ensure that the facility is tight before adding the tracer. <br /> A repair technician should be on site with all tools and parts to complete repairs to any and all components that are <br /> accessible. The technician should be qualified/certified to program and operate the electronics controlling the fueling <br /> system. <br /> Inoculation <br /> Inoculation is the process of adding chemical tracer to the product in the system to be tested. Product is inoculated with a <br /> predetermined amount of tracer, though the fill riser. Tracer is mixed with the product by using the system. Once <br /> sufficient amount of tracer labeled product has been moved through each dispenser,the product is tested at each dispenser <br /> to confirm that tracer is present. By keeping the dispenser nozzle inside a receiving container, additional product is <br /> pumped into the container to push tracer labeled vapors through the vapor return piping back to the tank. The tracer/vapor <br /> mixture is then pushed from the UST out to the vent riser into a container of sufficient size that the tracer/vapor mixture <br /> THIS INFORMATION IS THE PROPERTY OF PRAXAIR SERVICES,INC.. <br /> 2of3 <br />