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•1 si <br /> 1455 McDowell Blvd North Sic D <br /> ex� Sequoia Petaluma CA 94954 <br /> (707)792 1665 <br /> eqwAnalytical FAX(707)792 0342 <br /> www sequoialabs corn <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P305591 <br /> 3017 Ugare Road Suite 100 Prolect Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 06/05/03 16 20 <br /> Total Petroleum Hydrocarbons as Gasoline 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 3050782-EPA 5030,waters <br /> Laboratory Control Sample(3050782-BSI) Prepared&Analyzed 05/31/03 <br /> Gasoline Range Organics 2460 50 mg/m'Air 2750 89 65-135 <br /> Gasoline Range Organics 699 14 ppmv 780 90 65-135 <br /> Benzene 136 0 16 1. 12 5 109 65-135 <br /> Benzene 433 0 50 mg/ml Air 400 108 65-135 <br /> Toluene 593 0 13 ppmv 493 120 65-135 <br /> Toluene 223 050 mg/ml Air 186 120 65-135 <br /> Ethylbenzene 502 0 50 1. 470 107 65-135 <br /> Ethylbenzene 11 6 0 12 ppmv 108 107 65-135 <br /> Xylenes(total) 556 0 12 11 48 6 114 65-135 <br /> Xylenes(total) 241 0 50 mg/ml Air 210 115 65-135 <br /> ethyl tert-butyl ether 72 7 2 0 620 117 65-135 <br /> ethyl tert-butyl ether 202 0 56 ppmv l7 2 117 65-135 <br /> Surrogate a a a-Trifluorotoluene 571 503 114 65-135 <br /> Surrogate a a a-Trifluorotoluene 341 mg/ml Air 300 114 65-135 <br /> Surrogate 4-Bromofluorobenzene 199 340 <br /> 100 65-135 <br /> Surrogate 4-Bromofluorobenzene 41 8 ppmv 419 100 65-135 <br /> Laboratory Control Sample(3050782-BS2) Prepared&Analyzed 06/01/03 <br /> Gasoline Range Organics 695 14 ppmv 780 89 65-135 <br /> Gasoline Range Organics 2450 50 mglm'Air 2750 89 65-135 <br /> Benzene 395 0 50 400 99 65-135 <br /> Benzene 124 0 16 ppmv 125 99 65-135 <br /> Toluene 532 0 13 493 108 65-135 <br /> Toluene 200 050 mg/m'Air 186 108 65-135 <br /> Ethylbenzene 46 2 050 470 98 65-135 <br /> Ethylbenzene 10 7 0 12 ppmv 108 99 65-135 <br /> Xylenes(total) 219 0 50 mg/m'Air 210 104 65-135 <br /> Xylenes(total) 505 0 12 ppmv 486 104 65-135 <br /> Methyl tert-butyl ether 63 7 2 0 mg/ml Air 620 103 65-135 <br /> Methyl tert-butyl ether 17 7 0 56 ppmv 172 103 65-135 <br /> Surrogate a a,a-Trlfluarotoluene 321 mg/m'Air 300 107 6S-135 <br /> Surrogate a a a-Trifluorololuene 538 ppmv 503 107 65-135 <br /> Surrogate 4-Bromofluorobenzene 434 419 104 65-135 <br /> Surrogate 4-Bromofluorobenzene 310 mg/m'Air 300 103 65-135 <br /> equoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of eusiody document Unless otherwise stated,results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 6 of 8 <br />