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9 19 Striker Ave Ste 8 <br /> Sequoia Sacramento,CA 95$34 <br /> (9 16)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www.sequoialabs.co�n <br /> ettier-Ryan-Petaluma Project: Tosco 11195,Lathrop,CA S212525 <br /> 1364 N McDowell Blvd. Ste B2 Project Number. N/A Reported: <br /> Petaluma CA,94954 Project Manager: Dave Vossler 12/30/02 19:17 <br /> Total Metals by EPA 6000/7000 Series Methods -Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %RFC Limits RPD Limit Notes <br /> Batch 2120347-EPA 3050E <br /> Blank(2120347-BLKI) Prepared: 12/20/02 Analyzed: 12/23/02 <br /> Lead ND 2.5 mg/kg <br /> Laboratory Control Sample(2120347-BSI) Prepared: 12/20/02 Analyzed: 12/23/02 <br /> Lead 53.0 2.5 mg/kg 50.0 106 80-120 <br /> Matrix Spike(2120347-MSI) Source:5212372-49 Prepared: 12/20/02 Analyzed: 12/23/02 <br /> Lead 313 10 mglkg 50.0 240 146 80-120 QM-07 <br /> Matrix Spike Dup(2120347-MSDI) Source:5212372-49 Prepared: 12/20/02 Analyzed: 12/23/02 <br /> Lead 317 10 mg/kg 50.0 240 154 80-120 1 20 QM-07 <br /> Sequoia Analytical-Sacramento The results in this report apph,to the samples anahZed in accordance with the chain of <br /> custody doc anent. Unless olhe)-wue stated,results are reported on a wet wLight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 7 of 8 <br />