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885 Jarvis Dr <br /> Sequoia Magan Hill,CA 95037 <br /> • <br /> Analytical� (408)776-9600 <br /> FAX(408)782-6308 <br /> www.sequoialabs.com <br /> Stratus Environmental Inc. Project: ARCO#5469,Stockton,CA MLL0827 <br /> 3330 Cameron Park Dr.,Suite 550 Project Number: ARCO 45469,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 Hili <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2L30031 -General Preparation <br /> Matrix Spike Dup(2L30031-MSDI) Source:MLL0715-01 Prepared&Analyzed: 12/30/02 <br /> Total Alkalinity 125 5.0 mg/I 100 38 87.0 94-107 0.00 8 QM-07 <br /> Batch 2L30032-General Preparation <br /> Blank(2L30032-BLKI) Prepared&Analyzed: 12/30/02 <br /> Total Alkalinity ND 5.0 mg/l <br /> Laboratory Control Sample(2L30032-BSI) Prepared&Analyzed: 12/30/02 <br /> Total Alkalinity 99.2 5.0 mg/1 100 99.2 94-107 <br /> Matrix Spike(2L30032-MSI) Source:MLL0876-01 Prepared&Analyzed: 12/30/02 <br /> Total Alkalinity 133 5.0 mg/l 100 30 103 94-107 <br /> Matrix Spike Dup(2L30032-MSDI) Source:MLL0876-01 Prepared&Analyzed: 12/30/02 <br /> Total Alkalinity 133 5.0 mg/l 100 30 103 94-107 0.00 8 <br /> Batch 2L31040-General Preparation <br /> Blank(2L31040-BLKI) Prepared&Analyzed: 12/27/02 <br /> Total Dissolved Solids ND 10 mgI <br /> Laboratory Control Sample(2L31040-BS1) Prepared&Analyzed: 12/27/02 <br /> Total Dissolved Solids 510 10 mg/l 500 102 96-106 <br /> Matrix Spike(2L31040-MSI) Source:MLL0372-01 Prepared&Analyzed: 12/27/02 <br /> Total Dissolved Solids 575 20 mg/l 500 78 99.4 90.120 <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 /> Page 12 of 18 <br />