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Sequoia 885 Jarvis Drive <br /> Morgan Hill,CA 95037 <br /> 'W Analytical (408)776.9600 <br /> FAX(408)782-6308 <br /> WWW sequoialabs carr <br /> • URS Corporation I11 Project ARCO#4493,Stockton,Ca <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO#4493,Stockton,CA Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 11/11/02 07 04 <br /> Total Metals by EPA 6000/7000 Series Methods - Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2KO7022-EPA 3050B <br /> Blank(2K07022-13LK1) Prepared&Anal zed 11/07/02 <br /> Lead ND 5 0 mg/kg <br /> LCS(2K07022-BSI) Prepared&Anal zed 11/07/02 <br /> Lead 487 50 mg/kg 50 0 974 8&118 <br /> Matrix Spike 2K07022-MS1 Source MLK0089-0I Prepared&Analyzed 11/07/02 <br /> Lead 530 5 0 mg/kg 500 11 840 86-118 QM-07 <br /> Matrix Spike Du (2K07022-MSD1) Source MLK0089-01 Prepared&Analyzed 11/07/02 <br /> Lead 53 6 50 mg/kg 500 11 85 2 86-118 1 13 34 QM-07 <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 entirety <br /> 7 of 11 <br />