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SECOR www secor Corn <br /> INTERNATIONAL 3475 W Shaw Suite 104 <br /> Fresno CA 93711 <br /> S E C 0 R INCORPORATED <br /> 559-271-2850 TEL <br /> 559-271-5108 FAx <br /> January 14, 2005 RECENED <br /> JAIL! I P, 7n05 <br /> ENVlRQNMENT HEALTH <br /> Mr Ray Von Flue PERMIT/SEWCES <br /> San Joaquin County Department of Environmental Health <br /> 304 East Weber Ave , 3'd Floor <br /> Stockton, California 95202-2708 <br /> RE Analytical Results from Underground Storage Tank Tracer Test <br /> Chevron Station 9-1848 <br /> 1257 Yosemite Avenue <br /> Manteca, California <br /> SECOR Protect No 77CH 91848 02 0720 <br /> Dear Mr Von Flue <br /> SECOR International Incorporated is providing this status report to summarize activities <br /> completed in November 2004 and the current status of the underground storage tank (UST) <br /> tracer leak detection test at the Chevron Station 9-1848 The tests were conducted as part <br /> of a Chevron proactive initiative in response to elevated concentrations of methyl tert-butyl <br /> ether (MtBE) detected in monitoring wells C-1 and C-2 The Tracer Tight® Enhanced Leak <br /> Detection test was conducted to evaluate UST integrity and identify any possible leaks <br /> ACTIVITIES COMPLETED NOVEMBER 2004 <br /> The Tracer Tight® Enhanced Leak Detection (ELD) test was completed on November 12, <br /> 2004 by Shirley Environmental Testing, LLC (Shirley) The procedure includes the <br /> installation of 3/4-inch schedule 40 PVC probes installed within ten horizontal feet of possible <br /> leak locations In locations where tank pits and piping trenches did not contain engineered <br /> backfill (pea-gravel), the sampling probes were installed within five horizontal feet of <br /> possible leak locations Tank probes were installed along the outer long-side of each tank, <br /> generally at a depth within two feet of the tank bottom (or dust above the water table if <br /> applicable) Piping probes were placed along the product distribution, vapor recovery and <br /> vent piping trenches, generally at a depth of two feet below grade (Attachment 1, Figure 1) <br /> All probes were passively advanced using air vac techniques and, where necessary, holes <br /> were first cored into the pavement The top of each probe was fitted with a PVC sampling <br /> cap that was used later for soil vapor extraction <br /> After the probes were Installed, an infection of approximately one milligram per liter (mg/L) <br /> of an Inert"tracer" compound was Introduced into the UST system Approximately seven to <br /> fourteen days later, soil vapor samples were collected from the probes and sent directly to <br /> the laboratory for analysis Samples were analyzed using a laboratory grade gas <br /> chromatograph (GC) The GC was calibrated using an external gas standard Samples <br /> N\Files\Projects\chevron\Retai #9-1848\91848_Resuits Tracer Testdoc <br />