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r <br /> 85 Dr <br /> Sequoia Morgan Hilll,,CA CA 995037 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.sequoialabs.con <br /> Stratus Environmental Inc. Project: ARCO 95469,Stockton,CA MMB0444 <br /> 3330 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager, Jay Johnson 03/14/03 16:22 <br /> Conventional Chemistry Parameters by APHA/EPA 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 3020412-General Preparation <br /> Blank 3020412-BLKI) _ _ Prepared&Analyzed:02/20/03 <br /> Total Organic Carbon ND 0.20 mg/l <br /> Laboratory Control Sample(3020412-BSI - Prepared&Analyzed;02/20/03 <br /> Total Organic Carbon 9.96 0.20 mg/l 10.0 100 80-120 <br /> Matrix Spike(3020412-MS 1) Source:P302262-01 Prepared&Analyzed:02/2_010_3 <br /> Total Organic Carbon 67.4 1.6 mg/l 40.0 28 98 75-125 <br /> Matrix Spike Dup(3020412-MSDI) Source:P302262-01 Prepared&Analyzed:02/20/03 <br /> Total Organic Carbon 69.1 1.6 mg/l 40.0 28 103 75-125 2 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. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> 27 of 28 <br />