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1455 McDowell Blvd,North Ste 1) <br /> Sequoia Petaluma, CA 94954 <br /> 4 <br /> Analytical FAX a— ) (707)7921865 <br /> (707 792 0342 <br /> www seyuoialabs co <br /> � <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P402158 <br /> 3017 Kalgare 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 8015B18021B- 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 4020144-EPA 5030B,waters <br /> Blank(4020144-BLKI) _ Prepared&Analyzed 02/06/04 <br /> Gasoline Range Organics ND 14 ppmv <br /> Gasoline Range Organics ND 50 mg/ml Air <br /> Benzene ND 016 ppmv <br /> Benzene ND 050 mg/ml Air <br /> Toluene ND 050 " <br /> Toluene ND 013 ppmv <br /> Ethylbenzene ND 012 " <br /> Ethylbenzene ND 050 mg/m'Air <br /> Xylenes(total) ND 0 12 ppmv <br /> Xylenes(total) ND 050 mg/m'Air <br /> Methyl tert-butyl ether NA 2 0 " <br /> Methyl tert-butyl ether ND 056 ppmv <br /> Surrogate a a a-Trifluorotoluene 52 1 .503 104 65-135 <br /> Surrogate a a a-Trifluorotoluene 311 mg/m3 Air 300 104 65-135 <br /> Surrogate 4-Bromofluorobenzene 428 ppmv 419 102 65-135 <br /> Surrogate 4-Bromofluorobenzene 306 mg/m3 Air 300 102 65-135 <br /> Laboratory Control Sample(4020144-BSI) Prepared&Analyzed 02/06/04 <br /> Gasoline Range Organics 2740 50 mg/ml Air 2750 100 65-135 <br /> Gasoline Range Organics 776 14 ppmv 780 99 65-135 <br /> Benzene 140 0 16 11125 112 65-135 <br /> Benzene 447 0 50 mg/m'Air 400 112 65-135 <br /> Toluene 228 050 11186 123 65-135 <br /> Toluene 60 7 0 13 ppmv 493 123 65-135 <br /> Ethylbenzene 52 8 050 mg/m'Air 435 121 65-135 <br /> Ethylbenzene 12 2 0 12 ppmv 100 122 65-135 <br /> Xylenes(total) 56 1 0 12 " 486 115 65-135 <br /> Xylenes(total) 243 050 mg/ml Air 210 116 65-135 <br /> Methyl Cert-butyl ether 200 056 ppmv 172 116 65-135 <br /> Methyl cert-butyl ether 72 0 2 0 mg/m'Air 620 116 65-135 <br /> Surrogate a a a-Trti luorotoluene 350 11300 117 65-135 <br /> Surrogate a a a-Tris luorotoluene 58 7 ppmv 503 117 65-135 <br /> Surrogate 4-Bromofluorobenzene 443 419 106 65-135 <br /> Surrogate 4-Bromofluorobenzene 317 mg/m3 Air 300 106 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 12 of 18 <br />