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i <br /> Praxair Services,Inc. <br /> 3755 N. Business Center Drive <br /> Tucson,AZ 85705 <br /> Tel: (800)394-9929 <br /> Fax: (520)293-1306 <br /> IN SERVICEA LEAK DETECTION (I L ) <br /> TEST RESULTS <br /> Client Date: 2/22/2006 Site Info: Job 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 /> 2122/2006 <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 location 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 /> 2/25/2006 <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 Caldon> <br /> Signature: ' ,; /�i"� <br /> 3 of 3 38731 EL QA Retest MDC Report-Cert.xis <br />