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D— (70Blvd,North Ste D <br /> Sequoia 1455 McDowPetaluma,CA 949544 <br /> Analytical FAX <br /> 7)792-1865 <br /> (707)792-4342 <br /> rvwwsequoialabs.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 1 8:12 <br /> Conventional Chemistry Parameters by APIIAXPA 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 3120460-General Preparation <br /> Laboratory Control Sample(312.0.460-BSI) Prepared&Analyzed: 12/16/03 <br /> Total Dissolved Solids 706000 10000 ugll 742000 95 80-120 <br /> Duplicate(3120460-DUP1) _Source.P3_12317-01 Prepared&Analyzed: 12/16/03 <br /> Total Dissolved Solids 398000 10000 ugll 440000 10 35 <br /> Batch 3120641-General Preparation <br /> Blank(3120641-B1LK1)_ Prepared&Analyzed: 12/23/03 _ <br /> Chemical Oxygen Demand ND 20000 ugA <br /> Laboratory Control Sample(3120641-BSI) Prepared&Analyzed: 12/23/03 <br /> Chemical Oxygen Demand 251000 20000 ugll 250000 100 80 ••_,.._..:__ <br /> --- . 120 <br /> Matrix Spike(3120641-MSI) Source: P312266-10 Prepared&Analyzed: 12/23/03 <br /> mand <br /> 00 <br /> 50000 N <br /> 103 7 - <br /> Chemical <br /> atrix Spike D�e(3120641-MSDI) Source:e:P31226fi�10 ugn _ Prepared&AnaDlyzcd: 12/23/03 5 125- ---- ----- <br /> Chemical Oxygen Demand 497000 20000 ugll 500000 ND 99 75-125 3 20 <br /> Batch 3120642-General Preparation <br /> Blank(3120642-BLKI) Prepared&Analyzed: 12/23/03 <br /> Chemical Oxygen Demand ND 20000 ug/l <br /> Laboratory Control Sample(3120642-BSI) _ ^� Prepared&Analyze& 12/23/03_ <br /> Chemical OxygenDemand255000 20000 ugA 250000 102 80-120 <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 /> 10 basis. This analytical report must be reproduced in its entirety. <br /> Page 38 of40 <br />