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a)— (707) <br /> 1455 McDowell ,CASequoia Fetalum StealumaCA 9495444Analytical FAX 792-1865 <br /> (707)792-4342 <br /> • wwvsequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P305380 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/18/03 21:10 <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 3050564-EPA 3010A <br /> Blank(3050564-BLK1) Prepared:05/22/03 Analyzed:05/23/03 <br /> Iron ND 300 ug/1 <br /> Laboratory Control Sample(3050564-BSI) Prepared:05/22/03 Analyzed:05/23/03 <br /> Iron 5230 300 ug/1 5000 105 80-120 <br /> Matrix Spike(3050564-MSI) Source:P305262-01 Prepared:05/22/03 Analyzed:05/23/03 <br /> Iron 5070 300 ug/l 5000 ND 101 80-120 <br /> Matrix Spike(305_0564-MS2) Source:P305379-01 Prepared:05/22/03 Analyzed:05/23/03 <br /> Iron 5350 300 ug/I 5000 240 102 80-120 <br /> Matrix Spike Dup(3050564-MSD1) Source:P305262-01 Prepared:05/22/03 Analyzed:05/23/03 <br /> Iron 5130 300 ug/1 5000 ND 103 80-120 1 20 <br /> —Matrix Spike Dup(3050564-MSD2) Source:P305379-01 Prepared:05/22/03 Analyzed:05/23/03 <br /> n 5370 300 ug/1 5000 240 103 80-120 0.4 20 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 26 of 36 <br />