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• 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> D— (70-7)792-1865 <br /> Analytical FAX(707)792-0342 <br /> l� www sequoialabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P307150 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/23/03 16 39 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 801513/8021B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %aREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3070137-EPA 5030,waters <br /> Matnx Spike(3070137-MSI) Source P307110-02 Prepared&Analyzed 07/10/03 <br /> Gasoline Range Organics 701 14 ppmv 780 ND 90 65-135 <br /> Gasoline Range Organics 2470 50 mg/m'Air 2750 25 89 65-135 <br /> Benzene 408 0 50 1. 400 ND 102 65-135 <br /> Benzene 128 0 16 ppmv 12 5 ND 102 65-135 <br /> Toluene 58 7 0 13 493 ND 119 65-135 <br /> Toluene 221 0 50 mg/ml Air 186 ND 119 65-135 <br /> Ethylbenzene 108 0 12 ppmv 108 ND 100 65-135 <br /> Ethylbenzene 468 0 50 mg/m'Air 470 ND 100 65-135 <br /> Xylenes(total) 54 8 0 12 ppmv 486 ND 113 65-135 <br /> Xylenes(total) 237 0 50 mg/m'Air 210 ND 113 65-135 <br /> Methyl Cert-butyl ether 705 2 0 1. 620 ND 114 65-135 <br /> Alffihlethyl tert-butyl ether 196 0 56 ppmv 172 ND 114 65-135 - - <br /> S�urro-gate a a a-Trrfluorotoluene 54 1 1150.3 108 65-135 <br /> Surrogate a,a a-Trrfluorotoluene .323 mg/m'Air 300 108 65-135 <br /> Surrogate 4-Bromofluorobenzene 319 300 106 65-135 <br /> Surrogate 4-Bromofluorobenzene 446 ppmv 41 9 106 65-135 <br /> _Matrix Spike Dup(3070137-MSDI) Source P307110-02 Prepared&Analyzed 07/10/03 _ <br /> Gasoline Range Organics 2480 50 mg/ml Air 2750 25 89 65-135 04 20 <br /> Gasoline Range Organics 705 14 ppmv 780 ND 90 65-135 0 6 20 <br /> Benzene 406 0 50 mg/ml Air 400 ND 102 65-135 05 20 <br /> Benzene 12 7 0 16 ppmv 125 ND 102 65-135 0 8 20 <br /> Toluene 226 050 mg/m'Air 186 ND 122 65-135 2 20 <br /> Toluene 60 1 0 13 ppmv 493 ND 122 65-135 2 20 <br /> Ethylbenzene 10 8 0 12 108 ND 100 65-135 0 20 <br /> Ethylbenzene 470 0 50 mg/ml Air 470 ND 100 65-135 04 20 <br /> Xylenes(total) 242 0 50 210 ND 115 65-135 2 20 <br /> Xylenes(total) 55 9 0 12 ppmv 486 ND 115 65-135 2 20 <br /> Methyl tert-butyl ether 19 9 0 56 17 2 ND 116 65-135 2 20 <br /> Methyl tert-butyl ether 71 5 2 0 mg/ml Air 620 ND 115 65-135 1 20 <br /> Surrogate a a,a-Trrfluorotoluene 564 ppmv 503 112 65-135 <br /> Surrogate a a a-Trrfluorotoluene 337 mg/m'Air 300 112 65-135 <br /> Surrogate 4-Bromofluorobenzene 44 8 ppmv 419 107 65-135 <br /> Surrogate 4-Bromofluorobenzene 320 mg/m'Air 300 107 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 11 of 16 <br />