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.. <br /> 685 Jarvis Drive <br /> Sequoia Morgan 408)77 -9600 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www.s o abs.caff <br /> URS Corporation(11 Project: ARCO 9434 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#434 Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 10/29/02 11:33 <br /> Total Metals by EPA 6000/7000 Series Methods-Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Soumz %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2100339-EPA 3050B <br /> Blank(2100339-BLKI) Prepared: 10/23/02 Analyzed: 10/24/02 <br /> Lead ND 2.5 mg/kg <br /> LCS(2100339-BSI) Prepared: 10/23/02 Analyzed: 10/24/02 <br /> Lead 52.0 2.5 mg/kg 50.0 104 80-120 <br /> Matrix Spike(2100339-MSI) Source:S210363-01 Prepared: 10/23/02 Analyzed: 10/24/02 <br /> Lead 220 10 mg/kg 50.0 180 80 80-120 <br /> Matrix Spike Dup(2100339-MSDI) Source:5210363-01 Prepared: 10/23/02 Analyzed: 10/24/02 <br /> Lead 220 10 mg/kg 50.0 180 80 80-120 0 20 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. This analytical report must be reproduced in its entirely. <br /> 9 of 11 <br />