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1455 McDowell Blvd North Ste <br /> Sequoia Petaluma,CA 949544 <br /> (707)792-1865 <br /> Anal tical <br /> FAX(707)792-0342 <br /> If www.scquoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469, Stockton,CA P305380 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/18/03 21:10 <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 3050535-General Preparation <br /> Laboratory Control Sample(3050535-BSI) Prepared&Analyzed:05/20/03 <br /> Phosphorus 561 50 ug/I 500 112 80-120 <br /> Matrix Spike(3050535-MSI) Source: P305380-01 Prepared&Analyzed:05/20/03 <br /> Phosphorus 621 53 ug/I 526 120 95 75-125 <br /> Matrix Spike Dup(3050535-MSD1) Source:P305380-01 Prepared&Analyzed:05/20/03 <br /> Phosphorus 508 53 ug/I 526 120 74 75-125 20 20 QM-07 <br /> Batch 3050585-General Preparation <br /> Blank(3050585-BLK1) Prepared&Analyzed:05/22/03 <br /> Total Organic Carbon ND 200 ug/I <br /> Laboratory Control Sample(3050585-BS1) Prepared&Analyzed:05/22/03 <br /> dtal Organic Carbon 9180 200 ug/I 10000 92 80-120 <br /> atrix Spike(3050565-MS1) Soorce: P305380-01 Prepared&Analyzed:05/22/03 <br /> Total Organic Carbon 37300 1600 ug/I 40000 960 91 75-125 <br /> Matrix Spike Dup(3050585-MSDI) Source:P305380-01 Prepared&Analyzed:05/22/03 <br /> Total Organic Carbon 37100 1600 ug/l 40000 960 90 75-125 0.5 20 <br /> Batch 3050607-General Preparation <br /> Duplicate(3050607-DUP1) Source: P305380-01 Prepared&Analyzed:05/19/03 <br /> Dissolved Oxygen 4360 100 ug/1 4400 0.9 20 <br /> 0 <br /> Sequoia <br /> quoia 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 32 of 36 <br />