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Sequoia 865 Jarvis Drive <br /> Morgan HtU CA 95037 <br /> (408)776 9600 <br /> Analytical FAX f408)782 6308 <br /> www sequoialabs corn <br /> URS Corporation[ArcoI I Protect ARCO##5469,Stockton,CA MPF0114 <br /> 2870 Gateway Oaks Dr,Ste 300 Protect Number GOBZP-0010 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 06/30/06 11 12 <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 6F10002-General Preparation 1 EPA 410 4 <br /> Blank(6F10002-BLKI) Prepared 06/09/06 Analyzed 06/10/06 <br /> Chemical Oxygen Demand ND 30000 ug/l <br /> Laboratory Control Sample(6F10002-BS1) _ Prepared 06/09/06 Analyzed 06/10/06 <br /> Chemical Oxygen Demand 116000 33000 ug/l 111000 105 75-120 T � <br /> Matrix Spike(6F10002-MSI) Source M_P_F0117-01 Prepared 06/09/06 Analyzed 06/10/06 <br /> Chemical Oxygen Demand 127000 33000 ug/l 111000 37000 �al 75 120 <br /> Matrix Spike Dup(6F10002-MSDI) Source MPF0117-01 Prepared 06/09/06 Analyzed 06/10/06 <br /> Chemical Oxygen Demand 128000 33000 ug/l 1 1 1000 37000 82 75-120 08 15 <br /> 0 <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 an a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 18 of 20 <br />