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i <br /> 1455 McDoweli Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)742 L865865 <br /> �► Analytical FAX(707) 0342 <br /> • www sequoialablabs com <br /> URS Corp-Sacramento Project Arco Site 5469,Stockton,CA P412205 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/01/05 14 06 <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 4120323-EPA 3010A I EPA 6010B <br /> Blank(4120323-BLK1) Prepared&Analyzed 12/16/04 <br /> Iron ND 300 ug/l <br /> Laboratory Control Sample(4120323-BSI) Prepared&Analyzed 12/16/04 <br /> Iron 5310 300 ug/1 5000 106 80-120 <br /> Duplicate(4120323-DUP1) Source P412205-01 Prepared&Analyzed 12/16/04 <br /> Iron 3720 1500 ug/l 1800 70 25 BA <br /> Matrix Spike(4120323-MS1) Source P412205-01 Prepared&Analyzed 12/16/04 <br /> Iron 6580 300 ug/l 5000 1800 96 80-120 <br /> Matrix Spike Dup(4120323-MSD1) Source P412205-01 Prepared&Analyzed 12/16/04 <br /> Iron 6560 300 ug/1 5000 1800 95 80-120 03 20 <br /> —Post Spike(4120323-PSI) Source P412205-01 Prepared&Analyzed 12/16/04 <br /> n 6R40 300 ug/l 5000 1800 101 75-125 <br /> r <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed rn accordance with the charn of <br /> custody document Unless otherwise stated results are reported on a wet werght basis <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 21 <br />