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Sequoia 1455 McDowell Blvd North Ste! Petaluma CA 949544a— ) <br /> Analtical (707)792-0845 <br /> Y FAX(707)792-0342 <br /> www sequaialabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P402158 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 02/20/04 12 06 <br /> Conventional Chemistry Parameters by APHA/EPA 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 4020163-General Preparation <br /> Duplicate(4020163-DUP1) Source 5402143-09 Prepared&Analyzed 02/05/04 <br /> pH 7 32 1 00 pH Units 7 31 0 1 20 <br /> Batch 4020215-EPA 3510C <br /> Blank 4020215-BLKI) Prepared&Analyzed 02/17/04 <br /> TRPH ND 5 0 mg/l <br /> Laboratory Control Sam le 4020215-BSl Prepared&Analyzed 02/17/04 <br /> TRPH 8 03 5 0 mg/l 800 100 70-130 <br /> i <br /> Laboratory Control Sample Dup__(4020215-BSD1) Prepared&Analyzed 02/17/04 <br /> TRPH 8 03 5 0 mg/l 800 100 70-130 0 30 <br /> i <br /> I <br /> i <br /> i <br /> .Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> ofcustody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 17 of 18 <br />