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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical FAX(707)792 0865 <br /> 70T 792 0342 <br />—�� www sequoialabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P407278 <br /> 3017 Kilgare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/11/04 09 51 <br /> BTEX by 8021B - Qualify 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;4070288-EPA 5030B,waters <br /> Matrix Spike(4070288-MSI) Source P407195-01 Prepared&Analyzed 07/16/04 <br /> Methyl tert butyl ether 199 056 ppmv 157 016 126 65 135 <br /> Methyl tert-butyl ether 714 2 5 mg/ml Air 565 059 125 65 135 <br /> Surrogate aaa-Trrfluorotoluene 338 300 113 65 135 <br /> Surrogate aaa-Triuoraioluene 566 ppmv 503 113 65 135 <br /> Matrix Spike Dup(4070288-MSDI) Source P407195-01 Prepared&_Analyzed 07/16/04 <br /> Benzene 108 0 16 ppmv 107 0 032 141 65 135 4 20 <br /> Benzene 343 050 mg/ml Air 340 0 10 101 65-135 4 20 <br /> Toluene 458 0 13 ppmv 509 0 11 90 65 135 2 20 <br /> Toluene 172 050 mg/m'Air 192 043 89 65 135 2 20 <br /> Ethylbenzene 934 0 12 ppmv 106 ND 88 65 135 6 20 <br /> Ethyibenzene 405 050 mg/ml Air 460 ND 88 65 135 6 20 <br /> Xylenes(total) 462 0 12 ppmv 513 ND 90 65 135 3 20 <br /> Xylenes(total) 200 050 mg/m'Air 222 ND 90 65 135 3 20 <br /> Methyl tent butyl ether 187 0 56 ppmv 157 0 16 118 65-135 6 20 <br /> Methyl tent butyl ether 674 2 5 mg/m'Air 565 0 59 118 65 135 6 20 <br /> Surrogate aaa-Triuorotoluene 485 ppmv 503 96 65-135 <br /> Surrogate a a a-Trrfluorotoluene 289 mglm'Air 300 96 65-135 <br /> Sequoia Arialytical-Petaluma The results in this report apply to the samples analyzed m 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 tis entirety <br /> Page 13 of 17 <br />