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Sequoia 1455 McDowell Blvd,North Ste <br /> Petaluma,CA 944544 <br /> (707)792 1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoie[abs corn <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P405538 <br /> 3017 Kilgare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 06/14/0417 02 <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 4050700-EPA 50308 waters <br /> Matrix Spike(4050700-MS1) Source P405437-09 Prepared&Analyzed 05/28/04 <br /> Methyl tent-butyl ether 726 2 5 mgtm'Air 565 036 128 65-135 <br /> Methyl tert-butyl ether 202 056 ppmv 157 010 128 65-135 <br /> Surrogate a a a-Triuorotoluene 333 mg/ml Air 300 111 65-135 <br /> Surrogate a a a-Tr�fluorotoluene 558 ppmv 503 111 65-135 <br /> Matrix Spike Dup(4050700-MSD1) Source P405437-09 Prepared&Analyzed 05/28/04 <br /> Benzene 102 016 ppmv 107 0 072 95 65-135 1 20 <br /> Benzene 325 050 mglm'Air 340 0 23 95 65-135 09 20 <br /> Toluene 492 0 13 ppmv 509 ND 97 65-135 08 20 <br /> Toluene 185 050 mg/m'Air 192 ND 96 65-135 1 20 <br /> Ethylbenzene 9 08 0 12 ppmv 10 6 ND 86 65-135 2 20 <br /> Ethylbenzene 393 050 mg/m'Air 460 ND 85 65-135 2 20 <br /> Xylenes(total) 466 012 ppmv 513 0 095 91 65-135 0 2 20 <br /> Xylenes(total) 202 050 mg./ml Air 222 041 91 65-135 05 20 <br /> Methyl tert-butyl ether 200 056 ppmv 15 7 0 10 127 65-135 I 20 <br /> Methyl tett-butyl ether 72 1 2 5 mg1m'Air 565 036 127 65-135 0 7 20 <br /> Surrogate a a a-Tr+i luorotoluene 334 300 111 65-135 <br /> Surrogate a a a-Tris luorotoluene 560 ppmv 503 111 65-135 <br /> Sequoia Analytical-Petaluma The results to 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 /> 77us analytical report must be reproduced in its entirety <br /> Page 7 of 8 <br />