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Bvd,North Ste D <br /> Sequoia 1455 McDowPe aluma,CA 949544 <br /> r� <br /> a— ) (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P312283 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 01/12/04 18:12 <br /> Conventional Chemistry Parameters by APHA/EPA Methods - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3120642-General Preparation <br /> Matrix Spike(3120642-MSt) _ Source:P312554-01 Prepared&Analyzed: 12/23/03 <br /> Chemical Oxygen Demand 493000 20000 ugA 500000 26000 93 75-125 <br /> Matrix Spike Dup(3120642-MSDI Source: P312554-01 Prepared&Analyzed: 12/23/03 <br /> Chemical Oxygen Demand 544000 20000 ugll 500000 26000 104 �75-125 10 20 <br /> Batch 3120721 -General Preparation <br /> Blank(3120721-BLK1) Prepared&Analyzed: 12/28/03 <br /> Total Organic Carbon ND 200 no <br /> Laboratory Control Sample(3120721-BSI_)___ Prepared&Analyzed: 12/28/03 <br /> Total Organic Carbon 8340 200 ugft 10000 83 80-120 <br /> Matrix Spike(3120721-MSI) Source: P312283-06 Prepared&Analyzed: 12/28/03 <br /> otal Organic Carbon 46200 1600 ug/t 40000 8800 94 75-125 <br /> W--trix Spike Du 3120721-MS171 Source: P312283-06 Pre ared&Analvzed: 12/28/03 <br /> Total Organic Carbon 46400 1600 ug/l 40000 8800 94 75-125 0.4 20 <br /> Sequoia Analytical-Petaluma 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 /> Page 39 of 40 <br />