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../ 819 Stoker Avenue,Suite 8 <br /> / . \ Sequoia Sa"amen` 921-%CA 4 <br /> (9166 927-9600 <br /> ) <br /> FAX(916)921-0100 <br /> Iwo Analytical vnHw.sequolalabs.com <br /> Delta Environmental Consultants(Cameron Park) Project: Arco 5569 Stockton,CA <br /> 3330 Cameron Park Dr. Ste 550 Project Number. N/A Reported: <br /> Cameron Park CA,95682 ProjectManager: Jay Johnson 10/29/01 16:55 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source "/.REC RPD <br /> Analym Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1100286-EPA 5030B (11leOH] <br /> Blank(1100286-ELK_I) Prepared: 10/25/01 Analyzed: 10/26/01 <br /> Teri-butyl alcohol ND 10 mg/kg <br /> Methyl ten-butyl ether ND 0.10 <br /> Di-isopropyl ether ND 0.10 " <br /> Ethyl tent-butyl ether ND 0.10 " <br /> Tert-amyl methyl ether ND 0.10 " <br /> Ethanol ND 150 " <br /> Surrogate:1,1-DCAd4 2.50 2.50 100 60-140 <br /> LCS(1100286-BSI) Prepared: 10/25/01 Analyzed: 10/26/01 <br /> Methyl tert-butyl ether 2.66 0.10 mg/kg 2.50 106 60-140 <br /> Surrogate:1,2-DCAd4 2.56 2.50 102 60-140 <br /> Matrix Spike(1100286-MSl) _ Source:S110203-07 Prepared: 1025/01 Analyzed: 10/26/01 <br /> Methyl tert-butyl ether 2.38 0.10 mg/kg 2.50 ND 95.2 60-140 <br /> Surrogate:1,2-DCA-d4 2.19 2.50 91.6 60-140 <br /> Matrix Spike Dup(1100286-MSD!) Source:S110203-07 Prepared: 10/25/01 Analyzed: 1026/01 <br /> Methyl tert-butyl ether 2.53 0.10 mg/kg 2.50 ND 101 60-140 6.11 25 <br /> Surrogate:1,2-DCA-d4 2.35 2.50 94.0 60-140 <br /> Sequoia Analytical- Sacramento The results in this report apply to the samples anatyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety. <br /> Page 8 of 10 <br />