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]455Me <br /> Sequoia DowPNetalumaCA 94954 <br /> a- ) (707) 792 1865 <br /> r Analytical FAX(707) 792 0342 <br /> www sequoialabs corn <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P312141 <br /> 3017 Kilgare Road Suite 100 Project Number [none] Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/22/03 14 28 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Unus Level Result %REC Limits RPD Limit Notes <br /> Batch 3120158-EPA 5030B,waters <br /> Blank(3120158-BLK1) Prepared&Analyzed 12/06/03 <br /> Gasoline Range Organics ND 14 ppmv <br /> Gasoline Range Organics ND 50 mg/ml Air <br /> Benzene ND 0 50 " <br /> Benzene ND 016 ppmv <br /> Toluene ND 013 " <br /> Toluene ND 0 50 mg/ml Air <br /> Ethylbenzene ND 0 50 " <br /> Ethylbenzene ND 012 ppmv <br /> Xylenes(total) ND 0 12 " <br /> Xylenes(total) ND 0 50 mg/ml Air <br /> Methyl tert-butyl ether ND 0 56 ppmv <br /> �ethy]tert-butyl ether ND 2 0 mg/m'Air <br /> Surrogate a a a-Tr+i luorotoluene 290 300 97 65-135 <br /> Surrogate a a a-Trifluorotoluene 48 7 ppmv 503 97 65-135 <br /> Surrogate 4-Bromofluorobenzene 38 6 419 92 65-135 <br /> Surrogate 4-Bromofluorobenzene 276 mg/m'Air 300 92 65-135 <br /> Laboratory Control Sample(3120158-BSI) Prepared&Analyzed 12/06/03 <br /> Gasoline Range Orgamcs 626 14 ppmv 780 80 65-135 <br /> Gasoline Range Organics 2210 50 mg/m'Air 2750 80 65-135 <br /> Benzene 368 0 50 40 5 91 65-135 <br /> Benzene 11 5 0 16 ppmv 12 7 91 65-135 <br /> Toluene 55 3 0 13 1. 55 4 100 65-135 <br /> Toluene 208 0 50 mg/ml Air 208 100 65-135 <br /> Ethylbenzene 449 0 50 45 0 100 65-135 <br /> Ethylbenzene 104 0 12 ppmv 104 100 65-135 <br /> Xylenes(total) 231 0 50 mg/ml Air 218 106 65-135 <br /> Xylenes(total) 53 4 0 12 ppmv 502 106 65-135 <br /> Methyl tert-butyl ether 700 2 0 mg/ml Air 630 111 65-135 <br /> Methyl tert-butyl ether 19 5 0 56 ppmv 17 5 111 65-135 <br /> Surrogate a a a-Trifluorotoluene 581 503 116 65-135 <br /> Surrogate a a a-Tr+i luorotoluene 347 mg/m'Air 300 116 65-135 <br /> Surrogate 4-Bromofluorobenzene 319 " 300 106 65-135 <br /> Surrogate 4-Bromofluorobenzene 445 ppmv 419 106 65-135 <br /> quota 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 11 of 16 <br />