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Sequoia 1455 McDowell Blvd,North Ste <br /> Petaluma,CA 949544 <br /> (707)792-1865 <br /> mW Analytical FAX(707)792-0342 <br /> www sequoialabs co <br /> � <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P403078 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 03/19/04 15 02 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015BI8021B-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 4030128-EPA 5030B,waters <br /> Blank 4030128-BLKI Pre ared&Analyzed 03/05/04 <br /> Gasoline Range Organics ND 14 ppmv <br /> Gasoline Range Organics ND 50 rng/m'Air <br /> Benzene ND 0 50 " <br /> Benzene ND 016 ppmv <br /> Toluene ND 0 50 mg/m3 Air <br /> Toluene ND 013 ppmv <br /> Ethylbenzene ND 0 50 mg/m3 Air <br /> Ethylbenzene ND 012 ppmv <br /> Xylenes(total) ND 0 12 " <br /> Xylenes(total) ND 0 50 Mg/M3 Air <br /> Methyl tert-butyl ether ND 2 0 " <br /> Methyl tert-butyl ether ND 0 56 ppmv <br /> Surrogate a a a-Trrfluorotoluene 304 mg/m'Air 300 101 65-135 <br /> Surrogate a a a-Trifluorotoluene 51 0 ppmv 503 101 65-135 <br /> Surrogate 4 Bromofluorobenzene 406 " 41 9 97 65-135 <br /> Surrogate 4-Bromofluorobenzene 290 mg/m'Air 300 97 65-135 <br /> Laboratory Control Sample(4030128-BS1) Prepared&Analyzed 03/05/04 <br /> Gasoline Range Organics 2230 50 mg/ml Air 2750 81 65-135 <br /> Gasoline Range Organics 633 14 ppmv 780 81 65-135 <br /> Benzene 12 1 0 16 " 10 5 115 65-135 <br /> Benzene 38 7 0 50 mg/m'Air 33 5 116 65-135 <br /> Toluene 56 1 0 13 ppmv 504 111 65-135 <br /> Toluene 211 0 50 mg/ml Air 190 Ill 65-135 <br /> Ethylbenzene 11 4 0 12 ppmv 10 5 109 65-135 <br /> Ethylbenzene 494 050 mg/m'Air 45 5 109 65-135 <br /> Xylenes(total) 53 6 0 12 ppmv 51 2 105 65-135 <br /> Xylenes(total) 232 050 mg/m'Air 222 105 65-135 <br /> Methyl tert-butyl ether 17 3 056 ppmv 15 0 115 65-135 <br /> Methyl tert-butyl ether 62 3 2 0 mg/m3 Air 54 0 115 65-135 <br /> Surrogate a a a-Trifluorotoluene 572 ppmv 503 114 65-135 <br /> Surrogate a a a-Trrfluorotoluene 342 mg/m'Air 300 114 65-135 <br /> Surrogate 4-Bromofluorobenzene 425 ppmv 419 101 65-135 <br /> Surrogate 4-Bromofluorobenzene 304 mg/m'Air 300 101 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 12 of 23 <br />