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Tracer Research Corporation <br /> S;ONt.EI'T ON OPERATION AND IMPLEMENTATION <br /> The tracer leak detection method relies upon the addition of a highly volatile liquid <br /> chemical to the product in the tank. If a leak occurs in the underground storage system, fuel is <br /> released into the surrounding soil. The tracer escapes from the fuel by vaporization and <br /> disperses into the soil by molecular diffusion. Various means are used to sample the soil vapors <br /> in the immediate vicinity of the underground storage tanks and associated piping. Each probe <br /> has an effective detection radius of approximately 10 to 12 feet. This means that a given probe <br /> should detect a leak anywhere within the area described by the 10 foot radius around the probe. <br /> The tracer must be placed in the tank at least two weeks prior to the probe sampling for this <br /> method to be effective. This process of leak detection by placing a liquid or gas tracer in a <br /> liquid product followed by detection of the tracer underground in the vapor phase is protected <br /> under 7%LACER patents. <br /> The throughput factor is used to determine the amount of tracer chemical used to inoculate <br /> a given tank. The throughput factor is a multiplier and is based on the number of tank refills <br /> expected within the first three days after inoculation. The multiplied amount of tracer is used to <br /> maintain the concentration of tracer in the tank to at least 10 ppm over the first 3 days after <br /> inoculation based on the estimated amount of fuel to be recieved during this period. <br /> LEAK DETECTION CRITERIA <br /> The classification of leakage is based on the presence or absence of tracer. <br /> 1'A ' ' FAIL <br /> Criteria: Criteria: <br /> NO tracer detected tracer detected <br /> Total volatile hydrocarbon (TVHC) concentrations are measured to give additional <br /> information about site conditions. The TVHC data provide information about the severity of the <br /> leakage, and the degree of any possible environmental damage that may have occurred. The <br /> TVHC data is not used as a criterion factor to determine the status of a particular tank(s) or <br /> piping and is provided as supplemental information only. <br /> - 2 - <br />