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FROM :Chris W Papas/David B At on FAX NO. :209 951 5847 c. 06 2006 09:54PM P9 <br /> R�-- Praxair Services, Inc. <br /> IR_- 3755 N. Business Center Drive <br /> Tucson,AZ 85705 <br /> Praxair Services, Inc. Tel:(800)394-9929 <br /> Pax: (520)293-1306 <br /> IN SERVICE ENHANCED LEAK DETECTION (ISELD) <br /> TEST RESULTS <br /> Client Date. 2/22/2oo6 Site Info: .lob No: 38731 EL <br /> CGRS Wilson Way Chevron <br /> 5444 Dry Creek Rd. 431 N.Wilson Way <br /> Sacramento, CA 95838 Stockton, CA 95205 <br /> 2/22/2006 <br /> ON Site: 12 pm-Collected samples from vertical probe system-Tracer detected at probes 4,5, 16 and 21 <br /> during initial round.Additional re-samples were collected from all probes with detection-Tracer <br /> concentrations declined or were not detected In all but probe Dation 16.Samples were also collected from <br /> tank secondary-Tracer was detected within the 87 tank secondary-Additional investigation and sampling <br /> showed tracer at a higher level detected within the wiring junction box for the tank interstitial monitoring <br /> probe.This indicates that a vapor pathway is available through tank gauge wire Into common conduit- <br /> allowing tracer into the tank interstitial.Sealant was added within junction box to eliminate pathway.To <br /> confirm detections a second tracer was then introduced into both tanks.A return to site will occur after the 24 <br /> hour test duration. OFF SITE:6:15 pm. <br /> 2125/2006 <br /> ON SITE:8 am - Arrived site and sampled product at each dispenser to confirm tracer concentration <br /> through-out system. Samples collected from all probes with previous detection showed detection of the new <br /> tracer at Probe location 16 with an increase concentration of the original tracer.Additional samples were <br /> collected from probes In immediate area of probe 16-three additional sample locations were Installed and <br /> sampled between the existing locations-Probe 27,28,29. Results indicate that a leak exists in the single <br /> wall primary of the Vapor recovery line at or in close proximity of Probe 16-The Vapor Primary pipe has <br /> failed testing. Samples collected from the 87 tank secondary had no detection of the new tracer and greatly <br /> decrease residual concentrations of the original tracer-This confirms tracer migration from conduit system <br /> and eliminated by repairs made during initial site visit. <br /> RECOMMENDATION: <br /> Expose and Investigate Vapor Recovery pipe and joints in the immediate area of Probe 16. <br /> Reviewed By: Mark D C/aldon <br /> Signature: �- <br /> 3 of 3 38731 EL OA Retest MDC report-Cert.xls <br />