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985 J r"s Drive <br /> �i)— Sequoia Morgan Hill CA 95037 <br /> Analytical FAX(408408)775-9500 <br /> 782-6308 <br /> www sequoialabs corn <br /> URS Corporation[Arco II Project ARCO#5469, Stockton,CA MN10470 <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number N/P Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 09/29/04 17 33 <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 4I21047-General Preparation <br /> Blank(4I21047-BLK1) Prepared&Analyzed 09/21/04 <br /> Chemical Oxygen Demand ND 30000 ug/l <br /> Laboratory Control Sample(4I21047-BSI) Prepared&Analyzed 09/21/04 <br /> Chemical Oxygen Demand 94300 30000 ug/l 100000 94 80-124 <br /> Matrix Spike(4121047-MSI) Source MN10362-01 Prepared&Analyzed 09/21/04 <br /> Chemical Oxygen Demand 108000 33000 ug/l 111000 ND 97 80-124 <br /> Matrix Spike Dup(4I21047-MSD1) Source MN10362-01 Prepared&Analyzed 09/21/04 <br /> Chemical Oxygen Demand 126000 33000 ug/1 111000 ND 114 80-124 15 23 <br /> 0 <br /> �oia 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 bases <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 17 <br />