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Sequoia 1455 McDowell Blvd North Ste <br /> Petaluma CA 949544 <br /> Analytical (707)792 1865 <br /> FAX(707)792 0342 <br /> www sequoialabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P405538 <br /> 3017 Kilgare Road Suite 100 Project Number WR 63%4 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 06/14/04 17 02 <br /> BTEX by 8021B - Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reportmg Spike Source %REC RPD <br /> Analyte Result Limn Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4050700-EPA 5030E waters <br /> Blank(4050700-BLKI) Prepared&Analyzed 05/28/04 <br /> Benzene ND 050 mg/ml Air <br /> Benzene ND 016 ppmv <br /> Toluene ND 013 " <br /> Toluene ND 050 mg/m'Air <br /> Ethylbenzene ND 012 ppmv <br /> Ethylbenzene ND 0 50 mg/ml Air <br /> Xylenes(total) ND 0 50 " <br /> Xylenes(total) ND 0 12 ppmv <br /> Methyl tert-butyl ether ND 0 56 " <br /> Methyl tert-butyl ether ND 2 5 mg/ml Air <br /> Surrogate a a a-Trrr luorotoluene 510 ppmv 503 101 65-135 <br /> Surrogate a a a-Trti luorotoluene 304 mg/ml Air 300 101 65-135 <br /> Laboratory Control Sample(4050700-BSI) Prepared&Analyzed 05/28/04 <br /> Benzene 336 050 mg/ml Air 340 99 65-135 <br /> Benzene 105 0 16 ppmv 107 98 65-135 <br /> Toluene 186 0 50 mg/m'Air 192 97 65-135 <br /> Toluene 496 0 13 ppmv 509 97 65-135 <br /> Ethylbenzene 398 0 50 mg/ml Air 460 87 65-135 <br /> Ethylbenzene 9 19 0 12 ppmv 106 87 65-135 <br /> Xylenes(total) 204 050 mg/ml Air 222 92 65-135 <br /> Xylenes(total) 47 0 012 ppmv 513 92 65-135 <br /> Methyl Cert-butyl ether 74 2 2 5 mg/m'Air 56 5 I31 65-135 <br /> Methyl tent-butyl ether 206 0 56 ppmv 15 7 131 65-135 <br /> Surrogate aaa-Trtuorotoluene 328 mg/m'Alr 300 109 65-135 <br /> Surrogate aa a-Trri luorotoluene 549 ppmv 503 109 65-135 <br /> Matrix Spike(4050700-MS1) Source*P405437-09 Prepared&Analyzed 05/28/04 <br /> Benzene 103 0 16 ppmv 107 0 072 96 65-135 <br /> Benzene 328 0 50 mg/ml Air 340 023 96 65-135 <br /> Toluene 48 8 0 13 ppmv 509 ND 96 65-135 <br /> Toluene 183 050 mg/m3 Air 192 ND 95 65-135 <br /> Ethylbcnzene 8 94 0 12 ppmv 106 ND 84 65-135 <br /> Ethylbenzene 38 7 050 mg/ml Air 46 0 ND 84 65-135 <br /> Xylenes(total) 465 0 12 ppmv 513 0 095 90 65-135 <br /> Xylenes(total) 201 050 mglm'Air 222 041 90 65-135 <br /> Sequoia Analytical-Petaluma 77m 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 iii its entirety <br /> Page 6 of 8 <br />