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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 cam <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P401386 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36588 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/29/04 19 13 <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 4010498-EPA 5035,sod <br /> Matrix Spike Dup(4010498-MSDI) Source P401269-01 Prepared&Analyzed 01/27/04 <br /> Gasoline Range Organics 2 07 1 0 mg/kg 275 0 031 74 65-135 33 20 QR-07 <br /> Benzene 0 0414 00050 0 0400 ND 104 65-135 33 20 QR-07 <br /> Toluene 0 200 00050 0 186 ND 108 65-135 32 20 QR-07 <br /> Ethylbenzene 00475 0 0050 00435 000040 108 65-135 32 20 QR-07 <br /> Xylenes(total) 0 229 0 0050 0 210 0 0027 108 65-135 31 20 QR-07 <br /> Surrogate a a a-Tris luorotoluene 0 180 0 300 93 65-135 <br /> Surrogate 4-Bromof7uorobenzene 0 140 0 300 80 65-135 <br /> Matrix Spike Du 4010498-MSD2 Source P401269-01 Prepared&Analyzed 01/27/04 <br /> Gasoline Range Organics 1 86 1 0 mg/kg 2 75 0 031 67 65-135 10 20 <br /> Benzene 0 0395 00050 00400 ND 99 65-135 7 20 <br /> Toluene 0 194 00050 0 186 ND 104 65-135 7 20 <br /> Othylbenzene 0 0443 00050 00435 000040 101 65-135 8 20 <br /> ylenes.(total) 0 214 0 0050 0 210 00027 101 65-135 8 20 <br /> Surrogate a a a-Trifluorotoluene 0 286 0 300 95 65-135 <br /> Surrogate 4-Bromofluorobenzene 0206 0 300 69 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 <br /> Page 6 of 8 <br />