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Sequoia Ws McDowell Blvd,North Ste D <br /> a— ) Petaluma,CA 94954 <br /> (707)792-1865 <br /> Iwo Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project; Arco Site 5469,Stockton,CA P309139 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number; WR36605 Reported: <br /> Sacramento CA,95833 Project Manager; Jay Johnson t0/16/03 19:28 <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 3090231 -General Preparation <br /> Blank(3090231-BLKI) Prepared&Analyzed:09/10/03 <br /> Orthophosphate as P ND 50 ug/l <br /> Laboratory Control Sample(3090231-BS1) Prepared&Analyzed:09/10/03 <br /> Orthophosphate as P 506 50 ug/1 500 101 80-120 <br /> Matrix Spike(3090231-MSI) Source: P309139-10 Prepared&Analyzed:09/10/03 <br /> Orthophosphate as P 523 50 ugll 526 ND 99 75-125 <br /> Matrix Spike Dup(3090231-MSDI) Source: P309139-10 Prepared&Analyzed:09/10/03 <br /> Orthophosphate as P 502 50 ug/1 526 ND 95 75-125 4 20 <br /> Batch 3090300-General Preparation <br /> Blank(3090300-BLKI) Prepared&Analyzed:09/15/03 <br /> otal Organic Carbon ND 200 ugll <br /> aboratory Control Sample(3090300-BS1) Prepared&Analyzed:09/15/03 <br /> Total Organic Carbon 8690 200 ug/1 10000 87 80-120 <br /> Matrix Spike(3090300-MSI) Source: P309139-01 Prepared&Analyzed: 09/15/03 <br /> Total Organic Carbon 9220 400 ug11 10000 1400 78 75-125 <br /> Matrix Spike Du (3090300-MSDI) Source: P309139-01 Prepared&Analyzed:09/15/03 <br /> Total Organic Carbon 9640 400 ugll 10000 1400 82 75-125 4 20 <br /> Batch 3090315- General Preparation <br /> Blank(3090315-BLKI) Prepared&Analyzed:09/15/03 <br /> Total Dissolved Solids ND 10000 ugil <br /> I <br /> quota 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 basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 33 of 38 <br />