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985 Jarvis Dr <br /> Sequoia Morgin Win,CA 95037 <br /> (408)7 -9600 <br /> Analytical FAX(408)78282-6309 <br /> www.sequoialabs.ccm <br /> Stratus Environmental Inc. Project: ARCO#5469,Stockton,CA MLL0827 <br /> 3330 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 01/07/03 13:36 <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 %F-EC Limits RPD Limit Notes <br /> Batch 2L26038-General Preparation <br /> Duplicate(2L26038-DUPI) Source:MLL0827-06 Prepared&Analyzed: 12/23/02 <br /> Dissolved Oxygen 3.24 1,00 mgll 3.21 0.930 20 <br /> Batch 21L30024-General Pre aration <br /> Blank(2L30024-BLKI) Prepared, 12/27/02 Analyzed: 12/30/02 <br /> Chemical Oxygen Demand ND 30 mgll <br /> Laboratory Control Sample{2L30024-BSI) Prepared: 12/27/02 Analyzed: 12/30/02 <br /> Chemical Oxygen Demand 87.6 30 mg/l 100 87.6 80-124 <br /> Matrix Spike(2L30024-MS1) Source:MLL0677-01 Prepared: 12/27/02 Analyzed: 12/30/02 <br /> Chemical Oxygen Demand 102 30 mg/I 100 ND 102 80-124 <br /> Matrix Spike Dup(2L30024-M SDI) Source:MLL0677-01 Prepared: 12/27/02 Analyzed: 12/30/02 <br /> Chemical Oxygen Demand 97.1 30 mg/1 100 ND 97,1 80-124 4.92 23 <br /> Batch 200031 -General Preparation <br /> Blank(2L30031-BLKI) Prepared&Analyzed: 12/30/02 <br /> Total Alkalinity ND 5.0 mg/1 <br /> Laboratory Control Sample(2L30031-BSI) Prepared&Analyzed: 12/30/02 <br /> Total Alkalinity 99.2 5.0 mg/1 100 99.2 94-107 <br /> Matrix Spike(2L30031-MSI) Source:MLL0715-01 Prepared&Analyzed: 12/30/02 <br /> Total Alkalinity 125 5.0 mg/1 100 38 87,0 94-107 <br /> QM-07 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordancewith 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 /> Page 11 of 18 <br />