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i I <br /> S E C O R <br /> Mr Ray Von Flue <br /> January 14, 2005 <br /> Page 2 <br /> were analyzed by direct Injection Into the GC and the results were evaluated by comparison <br /> to an analytical standard Whenever the tracer was detected in the subsurface samples, <br /> blanks were run to validate the tracer detection This procedure provides a leak sensitivity <br /> of 0 005 gallons per hour (gph) and complies to all State Water Resources Control Board <br /> Water Quality (SWRCB) standards as outlined in Local Guidance (LG) Letter 113 <br /> TRACER TIGHT TEST RESULTS NOVEMBER 2004 <br /> On November 4, 2004, the probes were installed and a different tracer was added to each <br /> tank of the UST system The probes were collected on November 12, 2004 and the vapor <br /> analyzed on November 17, 2004 The analytical results show that the only system to pass <br /> the ELD test is the Tank 3 system The remaining two tank systems, Tank 1 and Tank 2, <br /> failed the ELD test Assessment of the Tank 1 system indicates a failure within the fill <br /> sump piping assembly and the turbine sump (Attachment 1, Figure 1a) Failures within the <br /> Tank 2 system point toward a failure within the fill sump piping assembly and vapor sump <br /> manifold (Attachment 1, Figure 1b) According to Shirley, the amounts of tracer detected <br /> are commonly indicative of a spillage during tank filling or bucketffill riser leakage at the fill <br /> and vapor sump piping assemblies (Dan Green, personal communication, 1111105) The <br /> table below presents the results of the ELD testing <br /> Tank Product Size Tracer System Fill Riser/ <br /> (Oct) (gal) Status Spill Bucket <br /> 1 91 12,000 G FAIL PASS <br /> 2 89 12,000 R FAIL PASS <br /> 3 87* 12,000 H PASS PASS <br /> EXPLANATION: <br /> oct = Octane Rating <br /> gal = Gallons <br /> * Note Tank 3 octane rating is incorrectly stated as 97 in Attachment 1 figures It is <br /> correctly stated as 87 in the Attachment 1 tables and text <br /> All tanks contain detectable concentrations of total volatile hydrocarbons (TVHC) The <br /> TVHC values presented in Attachment 1 (Figure 1c) merely indicate that there was liquid <br /> present in the system at the time of sampling The presence of TVHC does not indicate a <br /> failure of the ELD test <br /> N%FileslProiectslChevron\RetaiM9-1848\91848_Results Tracer Test doc <br />