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1455 McDowell Blvd North Ste D <br /> - Sequoia Petaluma CA 94954 <br /> (707)792 1865 <br /> FAX Analytical www <br /> labsco792 2 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P410118 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 10/11/04 15 36 <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 4100135- EPA 503013 waters/EPA 8260B <br /> Laboratory Control Sample Dup(4100135-BSD1) Prepared&Analyzed 10/07/04 <br /> Toluene 145 013 ppmv 133 109 84-119 7 20 <br /> Toluene 547 0 50 mg/ml Air 5 00 109 84-119 7 20 <br /> Xylenes(total) 364 012 ppmv 3 46 105 86-132 4 20 <br /> Xylenes(total) 15 8 0 50 mg/ml Air 150 105 86-132 4 20 <br /> Surrogate Dihromofluoromethane 484 500 97 84-122 <br /> Surrogate Dihromofluoromethane 0 617 ppmv 0 637 97 84-122 <br /> Surrogate 12-Dichloroethane-d4 122 11119 103 74-135 <br /> Surrogate 12-Dichloroethane-d4 516 mg/m'Air 500 103 74-135 <br /> Surrogate Toluene-d8 147 ppmv 133 111 84-119 <br /> Surrogate Toluene-d8 555 mg/m'Aar 500 111 84-119 <br /> uola Analytical- Petaluma The results in this report apply to 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 8 of 9 <br />