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1455 McDowell Blvd North Ste D <br /> 4 Sequoia Petaluma,C 94954 <br /> (7a7}799 2-1865 <br /> ��r' <br /> Analytical FAX(7G7)792-0342cm <br /> www sequoialabs labs o <br /> URS Corp-Sacramento Project Arca Site 6100,Tracy,CA P411271 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 11/15/04 13 28 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Limit Units Level Result %R.EC Limits RPD Limit Notes <br /> Batch 4110355- EPA 5030B waters/EPA 8260B <br /> Laboratory Control Sample Dup(4110355-BSD1) Prepared&Analyzed 11/12/04 <br /> Toluene 542 0 50 mg/ml Air 500 108 84-119 2 20 <br /> Toluene 144 013 ppmv 133 108 84-119 2 20 <br /> Xylenes(total) 381 0 12 11346 110 86-132 4 20 <br /> Xylenes(total) 16 5 050 mg/m'Air 15 0 110 86-132 4 20 <br /> Surrogate Dibromofluoromethane 5 62 11500 112 84-122 <br /> Surrogate Dibromofluoromethane 0 715 ppmv 0 637 112 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 577 mg/ml Air 500 115 74-135 <br /> Surrogate 12-Dichloroethane-d4 137 ppmv 119 115 74-135 <br /> Surrogate Toluene-d8 534 mg/m'Air 500 107 84-119 <br /> Surrogate Toluene-d8 142 ppmv 133 107 84-119 <br /> • <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 9 of 10 <br />