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I <br /> " Sequoia 1455 McDowP� 'uma,CA 949 vd,North Ste D <br /> f' (707)792-1365 <br /> Analytical <br /> FAX(707)792-0342 <br /> • www.sequoialabs.eom <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P406178 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/30/04 13:08 <br /> Conventional Chemistry Parameters by A.PHA/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 4060299-General Preparation <br /> Laboratory Control Sample(4060299-BSI _ Prepared&Analyzed:06/12/04 <br /> Chemical Oxygen Demand 229000 20000 ug/I 250000 92 80-120 <br /> _Matrix Seike(4060299-MS1) _ _ Source:P406209-01 Prepared&Analyzed:06/12/04 <br /> Chemical Oxygen Demand 505000 40000 ug/I 500000 48000 91 75-125 <br /> Matrix Spike Du_p(4_060299-MSD1) Source:P406209-01 Prepared&_Analyzed:06_/12/04_ <br /> Chemical Oxygen Demand 505000 40000 ug/I 500000 48000 91 75-125 0 20 <br /> Batch 4060317-General Preparation <br /> Blank 4060317-BLKI Prepared&Analyzed:06/14/04 <br /> Total Organic Carbon ND 200 ug/l <br /> Laboratory Control Sample 4060317-BS1) Prepared&Analyzed:06/14/04 <br /> W <br /> tal Organic Carbon 9330 200 ug/I 10000 93 80-120 <br /> atrix Spike(4060317-MS1) Source:P406101-01 Prepared&Analyzed:06/14/04 <br /> Total Organic Carbon 36900 1600 uo 40000 460 91 75-125 <br /> Matrix Spike Dup(4060317-MSDI) Source:P406101-01 Prepared&Analyzed:06/14/04 <br /> Total Organic Carbon 36900 1600 ugll 40000 460 91 75-125 0 20 —_— — <br /> Batch 4060390-General Preparation <br /> Blank(4060390-BLK1) Prepared&Analyzed:06/09/04 <br /> Orthophosphate as P ND 50 ug/l <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the <br /> chain of custody document. Unless otherwise stated,results are reported on a wet <br /> weight basis. This analytical report must be reproduced in its entirety, <br /> f <br /> Page 32 of 37 <br /> f <br />