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1455 McDowell Blvd,North Ste D <br /> Sequoia <br /> Petaluma,CA 94954 <br /> a)— (707)792-1865 <br /> W Analytical FAX(707)792.0342 <br /> www sequoialabs com <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 /> Matrix Spike(A060372-MS1) _Source P406207-01 _ Prepared&Analyzed 06/16/04 _ <br /> Methyl tert-butyl ether 645 2 5 mg/ml Air 56 5 ND 114 65-135 <br /> Methyl tert-butyl ether 179 056 ppmv 15 7 ND 114 65-135 <br /> Surrogate a a a-Trrfluorotoluene 341 mg/m3 Air 300 114 65-135 <br /> Surrogate a,a a-Trifluorotoluene 573 ppmv 503 114 65-135 <br /> Matrix Spike Dup(4060372-MSDI) Source P406207-01 Prepared&Analyzed 06/16/04 <br /> Benzene 364 0 50 mg/m'Air 340 ND 107 65-135 3 20 <br /> Benzene 11 4 0 16 ppmv 107 ND 107 65-135 3 20 <br /> Toluene 49 1 0 13 1150 9 0 53 95 65-135 4 20 <br /> Toluene 185 050 mg/ml Air 192 2 0 95 65-135 4 20 <br /> Ethylbenzene 9 96 0 12 ppmv 10 6 ND 94 65-135 0 6 20 <br /> Ethylbenzene 432 050 mglm'Air 460 ND 94 65-135 0 7 20 <br /> Xylenes(total) 50 1 0 12 ppmv 51 3 ND 98 65-135 0 4 20 <br /> Xylenes(total) 217 050 mg/ml Air 222 ND 98 65-135 0 5 20 <br /> Methyl cert-butyl ether 174 056 ppmv 15 7 ND 111 65-135 3 20 <br /> Methyl tert-butyl ether 024 2 5 mg/ml Air 56 5 ND 110 65-135 3 20 <br /> Surrogate a a a-Trifluorotoluene 568 ppmv 503 113 65-135 <br /> Surrogate a a a-Trifluorotoluene 339 mg/m'Air 300 113 65-135 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the <br /> chain ofeustody document Unless otherwise stated results are reported on a wet <br /> weight basis This analytical report must be reproduced in its entirety <br /> Page 8 of 10 <br />