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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 4D (707)792-1865 <br /> ,Analytical <br /> 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 RPU <br /> Analyte Result limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3120349-General Preparation <br /> Blank(3120349-BLK1) Prepared&Analyzed: 12/11/03 <br /> Orthophosphate as P ND 50 ugll <br /> Laboratory Control Sample(3120349-BSI) Prepared&Analyzed: 12/11/03 <br /> Orthophosphate as P 475 50 ugA 500 95 80-120 <br /> Matrix Spike(3120349-MSI) Source:P312283-01 Prepared&Analyzed: 12/11/03 _ <br /> Orthophosphate as P 644 50 ugA _ 526 120 100 75-125 <br /> Matrix Spike Du (3120349-MSD/) Source: P312283-01 Prepared&Anal zed: 12/11/03 <br /> Orthophosphate as P 640 50 ugA 526 120 99 75-125 0.6 20 <br /> Batch 3120432-General Preparation <br /> Blank(3120432-BLK1) Prepared&Analyzed: 12/15/03 <br /> Total Dissolved Solids 10000 10000 um <br /> aboratory Control Sample(3I20432-BS1) Prepared&Analyzed: 12/1510_3 <br /> Total Dissolved Solids 698000 10000 ug/l 742000 94 80-120 <br /> Duplicate(3120432-DUPI) Source: P312329-01 Prepared&Analyzed: 12/15/03 <br /> Total Dissolved Solids 2760000 10000 ugA 2800000 1 35 <br /> Batch 3120460-General Preparation <br /> Blank 3120460-BLK1 Prepared&Anal zed: 12/16/03 <br /> Total Dissolved Solids ND 10000 ug/l <br /> i <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 37 of 40 <br />