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1455 McDowell Blvd North Ste D <br /> i <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> �rFAX(707)792 0342 <br /> Analytical <br /> www sequoiala6s coin <br /> is <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 LimitNotes <br /> Batch 4100135-EPA 5030B waters/EPA 8260B <br /> Laboratory Control Sample Dup(4100135-BSDI) Prepared&Analyzed 10/07/04 <br /> Toluene 1 45 013 ppmv 1 33 109 84-119 7 20 <br /> Toluene 5 47 0 50 mg/m'Air 5 00 109 84-119 7 20 <br /> Xylenes(total) 3 64 012 ppmv 346 105 86-132 4 20 <br /> Xylenes(total) 15 8 0 50 mWm'Air 15 0 105 86-132 4 20 <br /> Surrogate Dahromq/luoromethane 484 11500 97 84-122 <br /> Surrogate Dibromofluoromethane 0 617 ppmv 0 637 97 84-122 <br /> Surrogate 12-Dichloroethane-d4 122 11119 103 74-135 <br /> Surrogate 12-Dichloroethane-d4 5 16 mg/m'Air 500 103 74-135 <br /> Surrogate Toluene-d8 1 47 pprnv 133 111 84-119 <br /> Surrogate Toluene-d8 555 mg/m'Air 5 00 111 84-119 <br /> ola Analytical-Petaluma The results in this report apply to the samples analy-ed in accordance ivith the chain of <br /> custody document Unless olhenvise stated results are reported on a ivet weight basis <br /> This analytical report must be reproduced to its entirety <br /> Page 8 of 9 <br />