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Sequoia 885 Jarvis Dr <br /> Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.com <br /> [3330C <br /> tus Environmental Inc. Project: ARCO 45469,Stockton,CA MMC0495 <br /> ameronark Dr.,Suite 550 Project Number: Arco#5469,Stockton,CA Reported: <br /> eron Park CA,95682 Project Manager: Jay Johnson 03/28/03 15:43 <br /> Conventional Chemistry Parameters by APHA/EPA 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 3C13012-General Preparation <br /> Duplicate(3C13012-DUP2) Source:MMC0494-11 Prepared&Analyzed:03/11/03 <br /> Dissolved Oxygen 2.15 1.00 mg/l 2.14 0.466 20 <br /> Batch 3C19018-General Preparation <br /> Blank(3CI9018-BLKI) Prepared:03/18/03 Analyzed:03/19/03 <br /> Chemical Oxygen Demand ND 30 mgA <br /> Blank(3C19018-BLK2) Prepared:03/18/03 Analyzed:03/19/03 <br /> Chemical Oxygen Demand ND 30 mg/I <br /> Laboratory Control Sample(3019018-BSI) Prepared:03/18/03 Analyzed:03/19/03 <br /> Chemical Oxygen Demand 82.1 30 mg/I 100 82.1 80-124 <br /> laboratory Control Sample(3C19018-BS2 <br /> } Prepared:03/18/03 Analyzed:03/19/03 <br /> Chemical Oxygen Demand 90.9 30 mgR 100 90.9 80-124 <br /> Matrix Spike(3C19018-MSI) Source:MMC0463-04 Prepared:03/18/03 Analyzed: 03/19/03 <br /> Chemical Oxygen Demand 909 300 mg/l 1000 50 85.9 80-124 <br /> Matrix Spike(3CI9018-MS2) Source:MAIC0387-04 Prepared:03/18/03 Analyzed: 03/19/03 <br /> Chemical Oxygen Demand 918 300 mg/1 1000 ND 91.8 80-124 <br /> Matrix Spike Dup(3019018-MSD1) Source.MMC0463-04 Prepared:03/18/03 Analyzed: 03/19/03 <br /> Chemical Oxygen Demand 878 300 mg/l 1000 50 82.8 80-124 3.47 23 <br /> Matrix Spike Dup(3019018-MSD2) Source: MMC0387-04 Prepared:03/18/03 Analyzed:03/19/03 <br /> Chemical Oxygen Demand 897 300 mg/l 1000 ND 89.7 80-124 2.31 23 <br /> i <br /> i <br /> Sequoia 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 /> 18 of 25 <br />