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a— ) (9819 Stryker Avenue,Suite B <br /> Sequoia Sacramento,CA 95834 <br /> Analytical FAX <br /> 16)9219600 <br /> iW 916)921-0100 <br /> www sequoialabs coin <br /> URS-Sac Gateway Oaks Protect ARCO 2093,Tracy,CA <br /> 2870 Gateway Oaks Dr,Ste 300 Protect Number 2093,Tracy,CA Reported <br /> Sacramento CA,95833 Protect Manager Vernon Elarth 07/16/02 17 03 <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 2070090-EPA 5030B[PIT] <br /> LCS 2070090-BSl Prepared&Anal zed 07/10/02 <br /> Methyl tert-butyl ether 27 1 0 50 ug/I 250 108 60-140 <br /> Surrogate 1,2-DCA-d4 264 " 250 106 60-140 <br /> Matnx Spike(2070090-MS1) Source S207012-02 Prepared&Analyzed 07/10/02 <br /> Methyl tent-butyl ether 25 8 050 ug/l 25 0 ND 103 60-140 <br /> Surrogate 12-DCA-d4 270 11 250 108 60-140 <br /> Matrix Spike Du 2070090-MSD1 Source 5207012-02 Prepared&Analyzed 07/10/02 <br /> Methyl tent-butyl ether 26 5 050 u8/1 25 0 ND 106 60-140 3 25 <br /> Surrogate 1 1-DCA-d4 269 250 108 60-140 <br /> 0 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed to accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 10 of l 1 <br />