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f" 1455 McDowell Blvd,North Sic <br /> Sequoia <br /> Petaluma,CA 949544 <br /> Analytical (707)792-1362 <br /> FAX(707}792-0342 <br /> www sequwalabs co <br /> � <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P402158 <br /> 3017 Ugare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 02/20/04 12 06 <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 Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4020143-EPA 5030B,waters <br /> Blank(4020143-BLK1) Prepared&Analyzed 02/06/04 <br /> Gasoline Range Organics ND 50 mg/ml Air^ <br /> Gasoline Range Organics ND 14 ppmv <br /> Benzene ND 050 mg/m'Air <br /> Benzene ND 016 ppmv <br /> Toluene ND 013 " <br /> Toluene ND 050 mg/m'Air <br /> Ethylbenzene ND 050 " <br /> Ethylbenzene ND 012 ppmv <br /> Xylenes(total) ND 050 mg/m'Air <br /> Xylenes(total) ND 0 12 ppmv <br /> Methyl tert butyl ether ND 056 " <br /> Methyl tert butyl ether ND 2 0 mg/m'Air <br /> Surrogate a a a-Trifluorotoluene 520 ppmv 503 103 65-135 <br /> Surrogate a a a-Trifluorotoluene 310 mg/m'Arr 300 103 65-135 <br /> Surrogate 4-Bromofluorobenzene 302 11 300 101 65-135 <br /> Surrogate 4-Bromofluorobenzene 421 ppmv 419 101 65-135 <br /> Laboratory Control Sample(4020143-BSl) Prepared&Analyzed 02/06/04 <br /> Gasoline Range Organics 722 14 ppmv 780 93 65-135 <br /> Gasoline Range Organics 2540 50 mg/m'Air 2750 92 65-135 <br /> Benzene 470 050 " 400 118 65-135 <br /> Benzene 147 0 16 ppmv 125 118 65-135 <br /> Toluene 64 9 0 13 493 132 65-135 <br /> Toluene 244 050 mg/ml Air 186 131 65-135 <br /> Ethylbenzene 51 3 0 50 " 43 5 118 65-135 <br /> Ethylbenzene 11 8 0 12 ppmv 100 118 65-135 <br /> Xylenes(total) 601 0 12 486 124 65-135 <br /> Xylenes(total) 261 050 mg/m'Air 210 124 65-135 <br /> Methyl tent-butyl ether 17 5 056 ppmv 172 102 65-135 <br /> Methyl tent-butyl ether 63 0 2 0 mg/ml Air 620 102 65 135 <br /> Surrogate a a a-Trifluorotoluene 61 8 ppmv 503 123 65-135 <br /> Surrogate a a a-Trrfluorotoluene 369 mg/m'Air 300 123 65-135 <br /> Surrogate 4-Bromofluorobenzene 431 ppmv 41 9 103 65-135 <br /> Surrogate 4-Bromofluorobenzene 308 mg/m'Air 300 103 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 0 <br /> Page 10 of 18 <br />