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885 Jarvis Dr <br /> '(D' Sequoia Morgnn Hill,CA 95037 <br /> AW Analytical (408)782-6300 <br /> FAX 408 782-6308 <br /> www.sequoialabs.can <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 - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3A20021 -General Preparation <br /> i <br /> Duplicate(3A20021-DUPI) Source:MMA0365-01 Prepared&Analyzed: 01/15/03 <br /> Dissolved Oxygen 9.05 1.00 mg/l 8.86 2.12 20 <br /> Duplicate(3A20021-DUPI) Source:MMA0406-10 Prepared&Analyzed: 01/15/03 <br /> Dissolved Oxygen 6.84 1"00 mg/l 6.79 0.734 20 <br /> Batch 3A21012-General Preparation <br /> Blank(3A21012-BLK1) Prepared&Analyzed: 01/20/03 <br /> Chemical Oxygen Demand ND 30 mg/l <br /> Laboratory Control Sample(3A21012-BSI) Prepared&Analyzed: 01/20/03 <br /> Chemical Oxygen Demand 89.2 30 mg/I 100 89.2 80-124 <br /> Atrix Spike(3A21012-MSI) Source:MMA0406-01 Prepared&Analyzed: 01/20/03 <br /> Chemical Oxygen Demand 86.3 30 mg/l 100 ND 86.3 80-124 <br /> Matrix Spike Dup(3A21012-MSD1) Source:MMA0406-01 Prepared&Analyzed: 01/20/03 <br /> Chemical Oxygen Demand 94.0 30 mg/l 100 ND 94.0 80-124 8.54 23 <br /> Batch 3A21027-General Preparation <br /> Blank(3A21027-BLK1) Prepared&Analyzed: 01/17/03 <br /> Total Dissolved Solids ND 10 mg/1 <br /> Laboratory Control Sample(3A21027-BSI) Prepared&Analyzed: 01/17/03 <br /> Total Dissolved Solids 498 10 mg/l 500 99.6 96-106 <br /> oia Analytical- Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custodydocument. Unless otherwise stated,results are reported on a wet weight as' <br /> 1' eight i u. <br /> This analytical report must be reproduced in its entirety. <br /> 29 of 34 <br />