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Sequoia 1455 McDowell Blvd,North Ste <br /> Petaluma,CA 949544 <br /> a— ) (707)792-1865 <br /> iw Analytical FAX(707)792-0342 <br /> www sequotalobs corn <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P406323 <br /> 3017 Kilgare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/07/04 16 39 <br /> BTEX by 8021B-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 4060372-EPA 5030B,waters <br /> Blank 4060372-BLKI Prepared&Analed 06/16/04 <br /> Benzene ND 0 50 mg/ml Air <br /> Benzene ND 016 ppmv <br /> Toluene ND 013 " <br /> Toluene ND 050 mg/m'Air <br /> Ethylbenzene ND 050 " <br /> Ethylbenzene ND 012 ppmv <br /> Xylenes(total) ND 0 12 " <br /> Xylenes(total) ND 050 mg/ml Air <br /> Methyl tert-butyl ether ND 2 5 " <br /> Methyl Cert-butyl ether ND 056 ppmv <br /> Surrogate a a,a-Trifluoro toluene 504 " 503 100 65-135 <br /> Surrogate aaa-Triuorotoluene 301 mg/m'Air 300 100 65-135 <br /> Laboratory Control Sample(4060372-BS1) Prepared&Analyzed 06/16/04 <br /> Benzene 35 7 050 mg/m'Air 340 105 65-135 <br /> Benzene 11 2 0 16 ppmv 107 105 65-135 <br /> Toluene 469 0 13 " 509 92 65-135 <br /> Toluene 176 050 mg/m'Air 192 92 65-135 <br /> Ethylbenzene 41 4 0 50 460 90 65-135 <br /> Ethylbenzene 9 55 0 12 ppmv 10 6 90 65-135 <br /> Xylenes(total) 480 0 12 " 51 3 94 65-135 <br /> Xylenes(total) 208 0 50 mg/ml Air 222 94 65-135 <br /> Methyl tcrt-butyl ether 187 0 56 ppmv 15 7 119 65-135 <br /> Methyl tert-butyl ether 672 2 5 mg/ml Air 565 119 65-135 <br /> Surrogate a,a,a Trffluorotoluene 540 ppmv 503 107 65-135 <br /> Surrogate a a,a-Trii luorotoluene 323 mg/m'Atr 300 108 65-135 <br /> Matrix Spike 0 0 72-M 1) P406207-01�Source Prepared&Anal ye.d_0„6/16/04 <br /> - <br /> Benzene 11 8 0 16 ppmv 10 7 ND 110 65-135 <br /> Benzene 37 5 050 mg/ml Air 34 0 ND 110 65-135 <br /> Toluene 51 1 0 13 ppmv 50 9 0 53 99 65-135 <br /> Toluene 192 050 mg/ml Air 192 2 0 99 65-135 <br /> Ethylbenzene 990 0 12 ppmv 10 6 ND 93 65-135 <br /> Ethylbenzene 429 050 mg/ml Air 460 ND 93 65-135 <br /> Xylenes(total) 49 9 0 12 ppmv 51 3 ND 97 65-135 <br /> Xylenes(total) 216 0 50 mg/ml Air 222 ND 97 65-135 <br /> Sequoia Analytical-Petaluma The results to this report apply to the samples analyzed in accordance with the <br /> chain of custody document Unless otherwise stated results are reported on a wet <br /> weight basis This analytical report must be reproduced in its entirety <br /> Page 7 of 10 <br />