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Sequoia 1455 McDowell Blvd,North Step <br /> Petaluma,CA 94954 <br /> (707)792 1865 <br /> a— ) <br /> WAnalytical FAX(707)792-0342 <br /> www sequoialabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P311302 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/01/03 15 25 <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 Lima Notes <br /> Batch 3110312-EPA 5030,waters <br /> Blank 3110312-BLKI) Pre ared&Anal zed 11/14/03 <br /> Gasoline Range Organics ND 14 ppmv <br /> Gasoline Range Organics ND 50 mg/ml Air <br /> Benzene ND 016 ppmv <br /> Benzene ND 0 50 mg/ml Air <br /> Toluene ND 013 ppmv <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 050 mg/m'Air <br /> Methyl tert-butyl ether ND 0 56 ppmv <br /> .Methyl tert-butyl ether ND 2 0 mg/m'Air <br /> Surrogate a a a Trifluorotoluene 48 0 ppmv 503 95 65-133 <br /> Surrogate a a a-Trifluorotoluene 286 mg/m'Air 300 95 65-135 <br /> Surrogate 4-Bromofluorobenzene 278 11300 93 65-135 <br /> Surrogate 4-Bromofluorobenzene 388 ppmv 41 9 93 65-135 <br /> Laboratory Control Sample(3110312-BS1) Prepared&Analyzed 11/14/03 <br /> Gasoline Range Organics 2320 50 mg/Fri'Air 2750 84 65-135 <br /> Gasoline Range Organics 659 14 ppmv 780 84 65-135 <br /> Benzene 38 1 050 mg/m'Air 405 94 65-135 <br /> Benzene 120 0 16 ppmv 12 7 94 65-135 <br /> Toluene 211 0 50 mg/ml Air 208 101 65-135 <br /> Toluene 560 0 13 ppmv 554 101 65-135 <br /> Ethylbenzene 441 050 mg/ml Air 450 98 65-135 <br /> Ethylbenzene 102 0 12 ppmv 104 98 65-135 <br /> Xylenes(total) 526 0 12 502 105 65-135 <br /> Xylenes(total) 228 0 50 mg/ml Air 218 105 65-135 <br /> Methyl Cert-butyl ether 705 20 63 0 112 65-135 <br /> Methyl tert-butyl ether 19 6 056 ppmv 17 5 112 65-135 <br /> Surrogate a a a-Trifluorotoluene 321 mg/m'Air 300 107 65-135 <br /> Surrogate a a a-Trifluorotoluene 539 ppmv S03 107 65-135 <br /> Surrogate 4-Bromofluorobenzene 299 mg/m'Air 300 100 65-135 <br /> Surrogate 4-Bromofluorobenzene 41 8 ppmv 41 9 100 65-135 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> I of custody document Unless otherwise stated,results are reported on a wet weight <br /> bases This analytical report must be reproduced in its entirety <br /> Page 10 of 15 <br />