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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P403161 <br /> 2870 Gateway Oaks Dr1Ve Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/11/04 11 27 <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 503013,waters <br /> Blank 4030228-BLKI) Prepared&Analyzed 03/10/04 <br /> Gasoline Range Organics(C6-C 10) ND 14 ppmv <br /> Gasoline Range Organics(C6-C 10) ND 50 mg/m'Air <br /> Benzene ND 0 50 " <br /> Benzene ND 016 ppmv <br /> Toluene ND 013 " <br /> Toluene ND 0 50 mg/m'Air <br /> Ethylbenzene ND 0 50 " <br /> Ethylbenzene ND 012 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 /> yl tert-butyl ether ND 0 56 ppmv <br /> agate a a,a-Trifluorotoluene 509 11503 101 65-135 <br /> Surrogate a,a a-Trifluoro toluene 304 mg/m'Air 300 101 65-135 <br /> Surrogate 4-Bromofluorobenzene 399 ppmv 419 95 65-135 <br /> Surrogate 4-Bromofluorobenzene 285 mg/m'Air 300 95 65-135 <br /> Laboratory Control Sample(4030228-BS1) Prepared&Analyzed 03/10/04 <br /> Gasoline Range Organics(C6-C10) 719 14 ppmv 780 92 65-135 <br /> Gasoline Range Organics(C6-C 10) 2530 50 mg/ml Air 2750 92 65-135 <br /> Benzene 13 2 0 16 ppmv 10 0 132 65-135 <br /> Benzene 42 0 0 50 mg/m'Air 32 0 131 65-135 <br /> Toluene 216 050 11190 114 65-135 <br /> Toluene 575 0 13 ppmv 504 114 65-135 <br /> Ethylbenzene 11 4 0 12 " 105 109 65-135 <br /> Ethylbenzene 493 0 50 mg/m'Air 45 5 108 65-135 <br /> Xylenes(total) 234 0 50 " 222 105 65-135 <br /> Xylenes(total) 54 1 0 12 ppmv 51 2 106 65-135 <br /> Methyl tert-butyl ether 700 2 0 mg/ml Au 54 0 130 65-135 <br /> Methyl tent-butyl ether 195 0 56 ppmv 15 0 130 65-135 <br /> Surrogate a a a-Trri luorotoluene 340 mg/m'Arr 300 113 65-135 <br /> Surrogate a a a-Trifluorotoluene 569 ppmv 503 113 65-135 <br /> Surrogate 4-Bromofluorobenzene 305 mg/m'Air 300 102 65-135 <br /> Surrogate 4-Bromofluorobenzene 426 ppmv 41 9 102 65-135 <br /> �ola 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 />