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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> 342 <br /> mow Analytical FAX quoi 792 0 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P403162 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/11/04 11 36 <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 4030228-EPA 5030B,waters <br /> Blank 4030228-BLK1) Prepared&Analyzed 03/10/04 <br /> Gasoline Range Organics(C6-C10) ND 14 ppmv <br /> Gasoline Range Organics(C6-C10) ND 50 mg/ml Air <br /> Benzene ND 0 50 " <br /> Benzene ND 016 ppmv <br /> Toluene ND 013 " <br /> Toluene ND 0 50 mg/ml Air <br /> Ethylbenzene ND 0 50 " <br /> Ethylbenzene ND Olt ppmv <br /> Xylenes(total) ND 0 12 " <br /> Xylenes (total) ND 0 50 mg/ml Air <br /> Methyl tert-butyl ether ND 2 0 " <br /> Alifthyl tert-butyi ether ND 0 56 ppmv <br /> agate a a a-TriJluorotoluene 509 11503 101 65-135 <br /> Surrogate a a a-Tris luorotoluene 304 mg/m3 Air 300 101 65-135 <br /> Surrogate 4-Bromo luorobenzene 399 ppmv 41 9 95 65-135 <br /> Surrogate 4-Bromofluorobenzene 285 mg/m3Air 300 95 65-135 <br /> Laboratory Control Sample(4030228-BSI) Prepared&Analyzed 03/10/04 <br /> Gasoline Range Organics(C6-C10) 719 14 ppmv 780 92 65-135 <br /> Gasoline Range Organics(C6-C10) 2530 50 mg/m'Air 2750 92 65-135 <br /> Benzene 13 2 0 16 ppmv 10 0 132 65-135 <br /> Benzene 420 0 50 mg/ml Air 320 131 65-135 <br /> roluene 216 0 50 11190 114 65-135 <br /> Toluene 57 5 0 13 ppmv 504 114 65-135 <br /> Ethylbenzene 114 0 12 105 109 65-135 <br /> Ethylbenzene 493 050 mg/m'Air 45 5 108 65-135 <br /> Xylenes(total) 234 050 11222 105 65-135 <br /> Xylenes(total) 54 1 0 12 ppmv 51 2 106 65-135 <br /> Methyl tert-butyl ether 700 2 0 mg/m'Air 540 130 65-135 <br /> Methyl tert-butyl ether 195 056 ppmv 15 0 130 65-135 <br /> Surrogate a a a-Tr]7uorotoluene 340 mg/m3 Air 300 113 65-135 <br /> Surrogate a a a-Triuorotoluene 569 ppmv 503 113 65-135 <br /> Surrogate 4-Bromofluorobenzene 305 mg/m'Air 300 102 65-135 <br /> Surrogate 4-Bromohuorobenzene 426 ppmv 41 9 102 65-135 <br /> �oia 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 4 of 6 <br />