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Sequoia 1455 McDowell Blvd North Ste49 4 <br /> a— ) <br /> Petaluma,CA 94954W Analytical (707)792 342 <br /> FAX 707)792 0342 <br /> www sequoialabs co <br /> � <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P403223 <br /> 3017 Kilgare Road Suite 100 Project Number [none] Reported <br /> Rancho Cordova CA,95670 Proaect Manager Rusty Benkosky 03/25/04 16 45 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %R-EC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4030287-EPA 5030B,waters <br /> Blank(4030287-BLK1 Prepared&Analyzed 03/11/04 <br /> Gasoline Range Organics(C6 C10) ND 14 ppmv <br /> Gasoline Range Organics(C6 C10) ND 50 ing/m'Air <br /> Benzene ND 050 " <br /> Benzene ND 016 ppmv <br /> Toluene ND 013 " <br /> Toluene ND 050 mg/ml Air <br /> Ethylbenzene ND 0 50 " <br /> Ethylbenzene ND 012 ppmv <br /> Xylenes(total) ND 0 12 " <br /> Xylenes(total) ND 050 mg/m'Air <br /> Methyl tert-butyl ether ND 2 0 " <br /> Methyl tert-butyl ether ND 0 56 ppmv <br /> Surrogate aaa-Trifluorotoluene 504 " 503 100 65-135 <br /> Surrogate a a a-Trifluorotoluene 301 mg/m'Air 300 100 65-135 <br /> Surrogate 4-Bromofluorobenzene 394 ppmv 419 94 65-135 <br /> Surrogate 4-3romofluorobenzene 282 mg/m'Rtr 300 94 65-135 <br /> Laboraton Control Sample 4030287-BSI) Prepared&Analyzed 03/11/04 <br /> Gasoline Range Organics(C6-C10) 721 14 ppmv 780 92 65-135 <br /> Gasoline Range Organics(C6-C10) 2540 50 mg/ml Air 2750 92 65-135 <br /> Benzene 13 5 0 16 ppmv 105 129 65-135 <br /> Benzene 43 2 0 50 mg/ml Air 33 5 129 65-135 <br /> Toluene 222 0 50 190 117 65-135 <br /> Toluene 590 0 13 ppmv 504 117 65-135 <br /> Ethylbenzene 11 5 0 12 10 5 110 65-135 <br /> Ethylbenzene 500 050 mg/ml Air 455 110 65-135 <br /> Xylenes(total) 237 0 50 " 222 107 65-135 <br /> Xylenes(total) 54 7 0 12 ppmv 51 2 107 65-135 <br /> Methyl tert-butyl ether 48 7 2 0 mg/m'Atr 540 90 65-135 <br /> Methyl tert-butyl ether 13 5 0 56 ppmv 150 90 65-135 <br /> Surrogate a a a-Trifluarotoluene 346 mg/m'itir 300 115 65-135 <br /> Surrogate a a a-Trifluorotoluene 579 ppmv 503 115 65-135 <br /> Surrogate 4-Bromofluorobenzene 301 mg/m'Air 300 100 65-135 <br /> Surrogate 4-Bromofluorobenzene 421 ppmv 419 100 65-135 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated,results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 5 of 7 <br />