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Sequoia <br /> Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> ,:D (916)921 9600 <br /> Analytical FAX(916)921 0100 <br /> www sequmalabs com <br /> URS-Sac Venture Oaks Project ARCO 6020,Manteca,CA <br /> 2520 Venture Oaks Way,Ste 250 ProjectNumber 6020,Manteca,CA Reported <br /> Sacramento CA,95833-3200 Project Manager Veme Elarth 07/08/02 16 27 <br /> Volatile Organic Compounds by EPA Method 8260B- 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 2060364-EPA 5030B JPfrJ <br /> LCS(2060364-BSI) Prepared&Analyzed 06/27/02 <br /> Methyl tert-butyl ether 220 050 U911 25 0 88 60-140 <br /> Surrogate 1 2-DCA-d4 260 11250 104 60-140 <br /> Matnx Spike 2060364-MS1 Source 5206335-01 Prepared&Analyzed 06/27/02 <br /> Methyl tent-butyl ether 22 6 0 50 U94 25 0 ND 90 60-140 <br /> Surrogate 12-DC4-d4 271 250 108 60-140 <br /> Matrix Spike Dup12060364-MSDI) Source 5206335-01 Prepared&Analyzed 06/27/02 <br /> Methyl tert-butyl ether 246 0 50 ugA 250 ND 98 60-140 8 25 <br /> Surrogate 12-DCA-d4 278 25 0 111 60-140 <br /> •Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> ojcustody document This analytical report must be reproduced in its eptrrety <br /> Page Page 8 of 9 <br />