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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> IT� (707)792-1865 <br /> 4W Analytical www squpiFAX equoi 792-0342 <br /> alahs cam <br /> 0 <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P403414 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 04/01/04 16 41 <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 4030675-EPA 503013,waters <br /> Blank 4030675-BLKI Prepared&Analyzed 03/24/04 <br /> Gasoline Range Organics(C6-C10) ND 50 ug/1 <br /> Surrogate 4-Bromofluorobenzene 285 300 95 65-135 <br /> Laboratory Control Sample(4030675-BSI) Prepared&Analyzed 03/24/04 <br /> Gasoline Range Organics(C6-C 10) 2040 50 119/1 2750 74 65-135 <br /> Surrogate 4-Bromofluorobenzene 292 11 300 97 65-135 <br /> Matrix Spike 4030675-MS1 Source P403394-16 Prepared&Analyzed 03/24/04 <br /> Gasoline Range Organics(C6-C 10) 2040 50 ug/l 2750 30 73 65-135 <br /> Surrogate 4-Bromofluorobenzene 295 11 300 98 65-135 <br /> Matrix Spike Dup J4030675-MSDI) Source P403394-16 Prepared&Analyzed 03/24/04 <br /> line Range Organics(C6-C10) 2040 50 ugll 2750 30 73 65-135 0 20 <br /> ogate 4-Bromofluorobenzene 293 11300 98 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 7 of 10 <br />