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4D (701455 McDowe <br /> Sequoia Petaluma CA 94951455 Blvd North Ste <br /> q <br /> 7)7921865 <br /> W Analytical <br /> FAX(707)792 0342 <br /> WWW sequQLalabs coin 0 <br /> 1 <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P407278 <br /> 3017 Kilgare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/11/04 09 51 <br /> Conventional Chemistry Parameters by APHAIEPA Methods- Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4070267-EPA 3510C <br /> Blank(4070267-BLK1) Prepared&Analyzed 07122104 <br /> TRPH ND 50 mg/l. <br /> Laboratory Control Sample(4070267-BSI) Prepared&Analyzed 07/22/04 <br /> TRPH 818 50 mg/l 800 102 70 130 <br /> Laboratory Control Sample Dup(4070267-BSD I) Prepared&Analyzed 07/22/04 <br /> TRPH 803 50 mg/l 800 100 70 130 2 30 <br /> Batch 4070269-General Preparation <br /> Duplicate(4070269-DUPI) Source S407140-01 Prepared&Analyzed 07/14/04 <br /> pH 824 1 00 pH Units 823 01 20 <br /> Sequoia 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 wel weight basis <br /> This analytical report must be reproduced in its entirety 0 <br /> Page 16 of 17 <br />