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^'V^ <br /> Sequoia <br /> Jarvis <br /> MorganHil] CA 950375037 <br /> (408)776 9600 <br /> Analytical (408)782 6308 <br /> wwwwwseqequoialabs com <br /> • <br /> URS Corporation[Arco II Project ARCO#5469,Stockton,CA M000479 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 04/07/05 12 53 <br /> Conventional Chemistry Parameters by APHA/EPA Methods - Quality Control <br /> SequoiaAnalytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5C24023-General Preparation 1 EPA 410 4 <br /> Blank(5C24023-BLKI) Prepared&Analyzed 03/24/05 <br /> Chemical Oxygen Demand ND 30000 ug/l <br /> Laboratory Control Sample(5C24023-BSI) Prepared&Analyzed 03/24/05 <br /> Chemical Oxygen Demand 86000 30000 ugll 100000 86 75-120 <br /> Matrix Spike(5C24023-MSI) Source M000460-01 Prepared&Analyzed 03/24/05 <br /> Chemical Oxygen Demand 212000 33000 ug/l 111000 100000 101 75-120 <br /> Matrix Spike Dup(5C24023-MSDI) Source M000460-01 Prepared&Analyzed 03/24/05 <br /> Chemical Oxygen Demand 211000 33000 ug/l 111000 100000 100 75-120 05 15 <br /> uoia 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 26 of 30 <br />