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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> a— ) (?07) t 865 <br /> Analytical 92- <br /> FAX{707 792 0342342 <br /> www sequotalabs com <br /> URS Corry-Sacramento Project Arco Site 2186,Stockton,CA P404458 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/22/04 17 51 <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 4040518-EPA 3050B <br /> Blank 4040518-BLKI Prepared&Ana] zed 04/21/04 <br /> Lead ND 7 5 mg/kg <br /> Laboratory Control Sample 4040518-BS1 Prepared&Ana] zed 0412.1/04 <br /> Lead 470 7 5 mg/kg 50 0 94 80-120 <br /> Matrix Spike 4040518-MS1Source P404458-01 Prepared&Analyzed 04/21/04 <br /> Lead 376 52 mg/kg 34 7 5 3 93 80-120 <br /> Matrix Spike Dup(4040518-MSD1) Source P404458-01 Prepared&Analyzed 04/21/04 <br /> Lead 407 61 mg/kg 41 0 53 86 80-120 8 20 <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 8 of 9 <br />