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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> a— ) (707)792-1845 <br /> Analytical FAX(707)792-4342 <br /> www sequoialabs com <br /> s <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P312071 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/22/03 13 18 <br /> Purgeable Hydrocarbons by EPA 8015B-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 3120197-EPA 5030B,waters <br /> Blank(3120197-BLKI) Prepared&Analyzed 12/08/03 <br /> Gasoline Range Organics ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 318 300 106 65-135 <br /> Laboratory Control Sample 3120197-BSI Prepared&Analyzed 12/08/03 <br /> Gasoline Range Organics 2220 50 ug/l 2750 81 65-135 <br /> Surrogate 4-Bromofluorobenzene 334 300 111 65-135 <br /> Matrix Spike(3120197-MS1) T Source P312071-01 Prepared&Analyzed 12/08/03 <br /> Gasoline Range Organics 2190 50 ug/l 2750 10 79 65-135 <br /> Surrogate 4-Bromofluorobenzene 334 300 111 65-135 <br /> Matrix Spike Du (3120197-MSD1) Source P312071-01 Prepared&Analyzed 12/08/03 <br /> Gasoline Range Organics 2120 50 u9/1 2750 10 77 65-135 3 20 <br /> Or—,19--tI <br /> 4-Bromofluorobenzene 331 " 300 111 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 13 of 17 <br />