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� 1455 McDowell Blvd North Ste D <br /> Sery U oia Petaluma CA 94954 <br /> `1 (7t}7)792-1865 <br /> a— ) <br /> Analytical www seqww sequ7)792-0342 <br /> oialabs corn <br /> URS Corp-Sacramento Project Arco Site 5469,Stockton,CA P412205 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/01/05 14 06 <br /> Conventional Chemistry Parameters by APHA/EPA Methods - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %aREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4120273-General Preparation 1 EPA 410 4 <br /> Blank(4120273-BLKI) Prepared&Analyzed 12/14/04 <br /> Chemical Oxygen Demand ND 20000 ug/l <br /> Laboratory Control Sample(4120273-BSI) Prepared&Analyzed 12/14/04 <br /> Chemical Oxygen Demand 242000 20000 ug/l 250000 97 80-120 <br /> Matrix Spike(4120273-MSI) Source P412205-04 Prepared&Analyzed 12/14/04 <br /> Chemical Oxygen Demand 613000 40000 ug/l 500000 100000 103 75-125 <br /> Matrix Spike Dup(4120273-MSD1) Source P412205-04 Prepared&Analyzed 12/14/04 <br /> Chemical Oxygen Demand 621000 40000 ug/l 500000 100000 104 75 125 1 20 <br /> I* <br /> Sequoia Analytical-Petaluma 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 20 of 21 <br />