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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> a— ) (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <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 /> Total Metals by EPA 6000/7000 Series Methods - 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 4010497-EPA 3050B <br /> Blank(4010497-BLK1) _ Prepared&Analyzed 01/27/04 <br /> Lead -ND - 7 5 mg/kg <br /> Laboratory Control Sample(4010497-BSI) Prepared&Analyzed 01/27/04 _ <br /> Lead 484 7 5 mg/kg 500 97 80-120 <br /> Matrix Spike(4010497-M_51)_ _ _Source P401386-01 Prepared&Analyzed 01/27/04 <br /> Lead 490 7 4 mg/kg 490 3 4 93 80-120 <br /> Matrix Spike Dup(4010497-MSDI) Source P401386-01 Prepared&Analyzed 01/27/04 <br /> Lead 38 2 6 0 mg/kg 39 7 3 4 88 80-120 25 20 QR-02 <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 7 of 8 <br />