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Sequoia 1455 McDowell Blvd North Ste <br /> Petaluma CA 949544 <br /> (707)792-1865 <br /> FAX Analytical wwseq(707)792-0342 <br /> om <br /> www sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P505120 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/19/05 11 20 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5050092-EPA 5030B waters/EPA 8260B <br /> Laboratory Control Sample Dup(5050092-BSD1) Prepared&Analyzed 05/17/05 <br /> Surrogate 12-Drchloroethane-d4 138 ppmv 119 116 74-135 <br /> Surrogate 12-Drchloroethane-d4 582 mg/m'Air 500 116 74-135 <br /> Surrogate Toluene d8 1 11 ppmv 122 91 84-119 <br /> Surrogate Toluene d8 453 mg/m'Air 500 91 84-119 <br /> Sequoia Analytical-Petaluma The results in this report apply io the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 10 of 11 <br />