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885 Jarvis Dr <br /> a— ).. Sequoia Magtn Hill,CA 95037 <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.com <br /> tus Environmental Inc. Project: ARCO#5469,Stockton,CA MMA0406 <br /> 0 Cameron Park Dr.,Suite 550 Project Number: ARCO##5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 02/11/03 14:07 <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 3010586-General Preparation <br /> Blank(3010586-BLKI) Prepared& Analyzed: 01/25/03 <br /> Total Organic Carbon ND 0.20 me <br /> Laboratory Control Sample(3010586-BSI) Prepared&Analyzed: 01/25/03 <br /> Total Organic Carbon 9.65 0.20 mgll 10.0 96 80-120 <br /> Matrix Spike(3010586-MS1) Source:MMA0406-01 Prepared& Analyzed: 01/25/03 <br /> Total Organic Carbon 39.0 1.6 mgll 40.0 0.83 95 75-125 <br /> Matrix Spike Dup(3010586-MSDI) Source: MMA0406-01 Prepared&Analyzed: 01/25/03 <br /> Total Organic Carbon 42.2 1.6 mg/l 40.0 0.83 103 75-125 8 20 <br /> oia Analytical - Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> 33 of 34 <br />