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Se uoia 885 Jarvis q Morgan Hilll,,CCA A 9950377 <br /> ,I r <br /> Analytical FAX(408)776- 00 <br /> {aos)792-(408) <br /> www.sequoialabs.corr <br /> Stratus Environmental Inc. Project: ARCO#5469,Stockton,CA MMB0444 <br /> 3330 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Tay Johnson 03/14/03 16:22 <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 3B18018-General Preparation <br /> Duplicate 31318018-DUP1 Source:MMB0444-10 Prepared&Analyzed:02/12/03 <br /> Dissolved Oxygen 7.74 1.00 mg/l 7.75 0.129 20 <br /> Batch 3819035-General Preparation <br /> Blank(3B19035-BLKI) _ Prepared&Analyzed:02/18/03 <br /> Total Dissolved Solids ND 10— mg/l -! <br /> Laboratory Control Sample @1319035-BSI) Prepared&Analyzed:02/18/03 <br /> Total Dissolved Solids 500 10 mg/l 500 _ 100 96-106 _._..,. <br /> Matrix Spike(3B19035-MSI) Source:MMB0431-01 Prepared&Analyzed:02/18/03 <br /> Total Dissolved Solids 605 20 mg/l _-„500 80 105 80-120 <br /> Matrix Spike Du 3B19035-MSDI Source:MMB0431-01 Prepared&Analyzed:02/18/03 <br /> Total Dissolved Solids 565 20 mg/l 500 80 97.0 80-120 6.84 20 <br /> Batch 3B19052-General Preparation <br /> j Blank 3B19052-BLKI) Prepared&_Analyzed:02/19/03 _ <br /> Chemical Oxygen Demand ND 30 mg/1 ^ <br /> Laboratory Control Sample(3B19052-BSI) Prepared&Analyzed:02/19/03 <br /> Chemical Oxygen Demand 106 30 mg/l 100 106 80-124 —— <br /> Matrix Spike QBI9052-MSl Source:MM80438-01 Prepared&Ana] zed:02/19/03 <br /> Chemical Oxygen Demand 881 300 mg/l 1000 49 83.2 80-124 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> 23 of 28 <br />