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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA <br /> 94954 <br /> 792 1855 <br /> 342 <br /> Analytical FAAcilum lab92 9orn <br /> www sequwalabs corn <br /> I <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 - Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limn Notes <br /> Batch 4070288-EPA 5030B,waters <br /> Blank(4070288-BLKI) Prepared&Analyzed 07/16/04 <br /> Benzene ND 016 ppmv <br /> Benzene ND 050 mg/m'Air <br /> Toluene ND 013 ppmv <br /> Toluene ND 050 mg/m'Air <br /> Ethylbenzene ND 050 " <br /> Ethylbenzene ND 012 pptnv <br /> Xylenes(total) ND 0 12 " <br /> Xylenes(total) ND 050 mg/m'Air <br /> Methyl tert-butyl ether ND 0 56 ppmv <br /> Methyl tert-butyl ether ND 25 mg/ml Air <br /> Surrogate a a a-T ri luorotoluene 498 ppmv 503 99 65-135 <br /> Surrogate a a a-Tnfluorotoluene 297 mg/m'Arr 300 99 65 135 <br /> Laboratory Control Sample(4070288-BS1) Prepared&Analyzed 07/16/04 <br /> Benzene 1 1 0 016 ppmv 107 103 65-135 <br /> Benzene 349 050 mg/m'Air 340 103 65-135 <br /> Toluene 46 1 013 ppmv 509 91 65-135 <br /> Toluene 173 050 mg/m'Air 192 90 65-135 <br /> Ethylbenzene 935 012 ppmv 106 88 65-135 <br /> Ethylbenzene 405 050 mglm'Air 460 88 65-135 <br /> Xylenes(total) 464 012 ppmv 513 90 65-135 <br /> Xylenes(total) 201 050 mg/m'Air 222 91 65-135 <br /> Methyl tert-butyl ether 68 3 2 5 565 121 65-135 <br /> Methyl tert-butyl ether 190 056 ppmv 157 121 65-135 <br /> Surrogate a a a-Triuorotoluene 493 " 503 98 65-135 <br /> Surrogate a a a-T;•ifluorotoluene 294 mg/m'Air 300 98 65-135 <br /> Matrix Spike(4070288-MSI) Source P407195-01 Prepared&Analyzed 07/16/04 <br /> Benzene 112 0 16 ppmv 10 7 0 032 104 65-135 <br /> Benzene 35 8 050 mg/ml Air 340 010 105 65-135 <br /> Toluene 176 050 192 043 91 65 135 <br /> Toluene 469 013 ppmv 509 0 11 92 65-135 <br /> Ethylbenzene 9 87 012 " 106 ND 93 65-135 <br /> Ethylbenzene 428 050 mg/ml Air 460 ND 93 65-135 <br /> Xylenes(total) 477 012 ppmv 513 ND 93 65-05 <br /> Xylenes(total) 207 050 mg/ml Air 222 ND 93 65 135 <br /> Sequoia 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 /> Thu analytical report must be reproduced in to entirety <br /> Page 12 of 17 <br />