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a— ) (707) <br /> S+ ]A55IvlcDowell alum North SteSeiqilola Petaluma,CA 94954441865 <br /> Analytical 792- <br /> FAX(707)792-0342342 <br /> wwwsequoialabs.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 %nREC RPD <br /> Analyle Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3060030-General Preparation <br /> Blank(3060030-BLK1) Prepared&Analyzed:06/02/03 <br /> Chemical Oxygen Demand ND 20000 ug/1 <br /> Laboratory Control Sample(3060030-BS1) Prepared&Analyzed:06/02/03 <br /> Chemical Oxygen Demand 242000 20000 ug/l 250000 97 80-120 <br /> Matrix Spike(3060030-MS1) Source:P305380-01 Prepared&Analyzed:06/02/03 <br /> Chemical Oxygen Demand 1010000 20000 ug/I 1000000 ND 101 75-125 <br /> Matrix Spike Dup(3060030-MSD1) _ Source:P305380-01 Prepared&Analyzed: 06/02/03 <br /> Chemical Oxygen Demand 1090000 20000 ug/l 1000000 ND 109 75-125 8 20 <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 33 of 36 <br />